CN220469778U - Directional drilling machine power head with rotation angle control and braking functions - Google Patents

Abstract

The utility model belongs to the technical field of coal mine drilling machines, and relates to a directional drilling machine power head with rotation angle control and braking functions. According to the utility model, the angle regulator is arranged on one side of the transmission, which is far away from the main motor, and the transmission shaft in the angle regulator is fixedly connected with the circumference of the driving shaft, so that the accurate and efficient regulation of the tool face angle is realized through the angle regulator with the accurate angle regulation and locking anti-rotation functions, the structure of the rotary braking device of the main motor is simplified, the functions of a large number of internal parts are converted into an external rotary speed reducer, the maintenance difficulty is greatly reduced, and the consumption of vulnerable parts is reduced.

Description

Directional drilling machine power head with rotation angle control and braking functions

Technical Field

The utility model belongs to the technical field of coal mine drilling machines, and relates to a directional drilling machine power head with rotation angle control and braking functions.

Background

In directional drilling by a directional drilling machine, the change of the drilling track direction is usually realized by adjusting the tool face angle. The power head of the existing directional drilling machine is basically the same as that of the traditional drilling machine, and a device capable of accurately controlling the rotation angle is not provided. The adjustment of the tool face angle is driven by a drilling rotary motor, the rotation speed is high, and the inertia of a power head transmission system is large, so that the control precision is poor, and the adjustment efficiency is low. Existing directional drilling machines typically have only one (or a group of) motors, i.e., the main motor that drives the spindle in rotation, so the main motor is also used to drive the spindle in rotation when adjusting the toolface angle. In the drilling process, a plurality of drill rods are necessarily connected through threads, so that the main shaft and the drill rods can only be driven to rotate forwards by using the main motor when the tool face angle is adjusted, and the reverse rotation is likely to loosen the threaded connection of the drill rods in the holes, so that the drill loss accident is caused. According to the requirement of the drilling speed of the coal mine, the main motor drives the drill rod to rotate at a higher speed, and the low speed is about 50r/min (300 degrees/s), so that the system has low adjustment precision. In addition, the power head transmission system (main shaft, gear and the like) has large mass and large inertia, and often cannot be accurately stopped when the tool face angle is adjusted in place, and once the preset angle is missed, the power head transmission system must rotate forward for about one circle to be readjusted and repeated, so that the adjustment efficiency is quite low and inaccurate.

Secondly, in the directional drilling process, the water braid is one of necessary accessories for directional drilling machine construction, and is used as a joint between the drilling machine and external pressure medium to convey pressure fluid required by drilling and deslagging to a drill rod and a drill bit. The water braid of the existing drilling machine is generally independent of other parts and is arranged at the tail end of the last or the last drill rod of the main shaft of the power head in an isolated manner; the water braid generally comprises a mandrel, a water inlet assembly sleeved on the mandrel, a bearing seat sleeved on the mandrel, an end cover detachably connected with the bearing seat and a rear cover detachably connected with the end cover; and a bearing is arranged between the bearing seat and the mandrel, and then the water braid is directly and independently arranged at the tail end of the last or the last drill rod of the main shaft of the power head through the mandrel. Because the water braid of the existing drilling machine is generally independent of other parts and is installed at the tail end of the last spindle of the power head or the tail end of the last drill rod in an isolated manner, the water braid of the existing drilling machine is subjected to uneven axial hydraulic pressure, and is not provided with other force transmission structures, the water braid is subjected to axial hydraulic impact and drilling vibration impact in drilling, and a mandrel support bearing of a mandrel is quite easy to damage, so that frequent maintenance is needed, and the construction efficiency is seriously affected.

The Chinese patent with the publication number of CN103061669B is a typical representative of the prior art, and discloses a large through hole power head of a coal mine underground directional drilling machine with a braking function, which is characterized by comprising a motor, a gearbox, a main shaft, an I shaft and a chuck, wherein the motor is connected with the main shaft through the gearbox, the I shaft is in meshed transmission with the main shaft through a gear in the gearbox, the chuck is arranged at the front end of the main shaft, the rear end of the main shaft is provided with a supporting ring, an oil distribution sleeve is sleeved on the main shaft, the I shaft is connected with a brake through the gearbox, and the brake adopts a wet friction disc structure; the driving plate of the brake is connected with an I shaft of the power head through a spline, the driving friction plate is connected with a fork claw of the driving plate, the driven friction plate is connected with a piston rod through a spline and an end cover shaft fixed on an end cover of the brake, 6 piston rod springs are circumferentially and uniformly sleeved on the piston rod, a pressure plate is arranged at the front end of the piston rod, the front end of the pressure plate is provided with 6 driving friction plates and 5 driven friction plates which are mutually overlapped, the tail end of the piston rod props against the front end of an end cover shaft, a pressing cap is arranged in a slotted hole at the front end of the end cover shaft, and shaft end springs are arranged at the bottom of the pressing cap; the front end of the end cover shaft is provided with a lock nut; the oil drain port of the motor is connected with the lower oil port of the shell of the brake, and the oil flows back to the oil tank through the upper oil port of the shell of the brake, and the piston rod spring is tightly matched with the piston rod. Therefore, the large through hole power head of the underground directional drilling machine for the coal mine has a main shaft braking function, and can simultaneously meet two technological methods of rotary drilling and directional drilling of a hole bottom motor. However, the large through hole power head of the underground directional drilling machine for the coal mine is not provided with a device capable of accurately controlling the rotation angle of the tool face, and a spindle motor is still required to be adopted for adjusting the rotation angle of the tool face, so that the tool face angle cannot be accurately adjusted; secondly, its brake equipment function is single, not only does not have the angle modulation function, and uses traditional friction disc mode, and inside vulnerable part is many, needs often to change the part, maintains, leads to the later stage to maintain comparatively difficultly in the operation.

Disclosure of Invention

Therefore, the utility model aims to provide a directional drilling machine power head with rotation angle control and braking functions, so as to solve the problem that the tool face angle cannot be accurately adjusted in the existing directional drilling process.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the directional drilling machine power head with the rotation angle control and braking functions comprises a main motor, a speed changer and a main shaft, wherein the speed changer is provided with a driving shaft, one end of the driving shaft is connected with the main motor, and the driving shaft is in meshed transmission with the main shaft through a gear in the speed changer;

the angle adjuster comprises a transmission shaft, a driving piston, a fixed fluted disc, a movable fluted disc, an angle adjuster end cover, a rotary seat, a connecting seat and a rotary speed reducer with a self-locking function, wherein one end of the transmission shaft is fixedly connected with the circumference of the transmission shaft, the other end of the transmission shaft is rotatably connected in the angle adjuster end cover through a bearing sleeved on the transmission shaft, a bearing gland is arranged at one end, far away from the transmission shaft, of the angle adjuster end cover, the driving piston, the fixed fluted disc and the movable fluted disc are sleeved on the transmission shaft, the driving piston is positioned at one end, close to the transmission shaft, of the transmission shaft, one end, far away from the transmission shaft, of the driving piston is connected with the movable fluted disc, the fixed fluted disc is fixedly connected with the transmission shaft in the circumference, and the fixed fluted disc is positioned between the driving piston and the movable fluted disc;

The movable fluted disc is a disc-shaped part with a central through hole, the central through hole is a stepped through hole, one side of the stepped through hole, facing the end cover of the angle regulator, is provided with a large-diameter through hole, the movable fluted disc is sleeved on the end cover of the angle regulator through the large-diameter through hole and is in sliding connection with the end cover of the angle regulator, the end surface, facing the driving piston, of the movable fluted disc is provided with first helical teeth distributed along the circumference, the fixed fluted disc is provided with second helical teeth meshed with the first helical teeth, and a spring is arranged between the inner end surface of the large-diameter through hole and the end surface of the end cover of the angle regulator, opposite to the inner end surface, so that the first helical teeth and the second helical teeth are meshed under the thrust of the spring;

the outer circular surface of the movable fluted disc is provided with evenly distributed bosses, the rotary seat is sleeved on the movable fluted disc and is provided with grooves matched with the bosses so as to be fixedly connected with the circumference of the movable fluted disc, and one end of the rotary seat is provided with a rotary reducer connecting disc fixedly connected with an output disc of the rotary reducer so as to transfer the rotation of the output disc in the rotary reducer to the movable fluted disc;

the connecting seat is sleeved on the driving piston, the outer circle of the connecting seat is divided into three-stage diameters, the diameter of the middle section is the largest, the end faces on two sides of the middle section are respectively connected with the speed changer and the rotary speed reducer so as to realize relative axial positioning among the speed changer, the connecting seat and the rotary speed reducer, the inner diameter of the connecting seat is divided into three-stage apertures, wherein the two-stage apertures far away from the speed changer are matched with the outer diameter of the driving piston and sleeved on the driving piston, and the output disc of the rotary speed reducer is coaxial with the rotary seat;

The driving piston is a two-stage stepped shaft, a sealing groove is arranged on the outer circle of the small diameter end of the driving piston, a sealing ring is installed in the sealing groove and matched with the corresponding position of a connecting seat sleeved on the sealing groove to form a first seal, the outer circle of the large diameter end is matched with the sealing ring installed on the corresponding position of the connecting seat to form a second seal, a sealing cavity between the driving piston and the connecting seat is formed between the first seal and the second seal, and an oil inlet communicated with the sealing cavity is formed in the connecting seat, so that the driving piston pushes a movable fluted disc towards the end cover direction of the angle regulator under the action of hydraulic oil entering the sealing cavity through the oil inlet.

Further, a transmission piston is further arranged between the driving piston and the movable fluted disc, the transmission piston is sleeved on the transmission shaft and is in sliding connection, one end of the transmission piston is connected with the driving piston, and the other end of the transmission piston is connected with the movable fluted disc to transmit the thrust of the driving piston.

Further, the rotary seat is cylindrical, and an end cover connecting disc is arranged at one end, far away from the rotary speed reducer connecting disc, of the rotary seat so as to be fixedly connected with the angle regulator end cover.

Further, the fixed fluted disc is provided with a fluted disc and a fixed shaft positioned at the center of the fluted disc, the second helical teeth are arranged on the fluted disc, the fixed shaft is inserted into a central through hole of the movable fluted disc, and a key slot is arranged in the fixed shaft, so that the fixed fluted disc is fixedly connected with the circumference of the transmission shaft through key connection.

Further, the angle regulator end cover is of a three-stage stepped hollow disc structure, the angle regulator end cover is sleeved on the transmission shaft through a bearing, the maximum outer diameter section of the angle regulator end cover is provided with a flange connected with the rotary seat, the maximum outer diameter section is located at one end far away from the driving shaft, the middle diameter section is used for bearing the rotary seat and limiting the axial movement distance of the movable fluted disc, the minimum diameter section is axially and slidably connected with a large-diameter through hole of the movable fluted disc, and the end face of the minimum diameter section is provided with a plurality of spring mounting holes which are used for mounting springs and uniformly distributed along the circumference.

Further, the driving shaft is arranged in the speed changer, one side end face of the middle section in the connecting seat is connected with the speed changer, one section of the connecting seat, which is close to the speed changer, is inserted into the speed changer and serves as axial stop of a bearing sleeved on the driving shaft, and one section of the connecting seat, which is close to the rotary speed reducer, extends to the inside of the rotary speed reducer so as to be used for installation and guide of the rotary speed reducer.

The directional drilling machine power head further comprises a water braid, a driving drill rod, a connecting sleeve and a connecting shaft, wherein the water braid comprises a mandrel, a water inlet assembly, a bearing seat, a sealing shaft and a mandrel support bearing, the water inlet assembly is sleeved on the mandrel and is rotationally connected, and the bearing seat is sleeved on the mandrel and is rotationally connected through mandrel support bearings which are arranged at two ends of the bearing seat;

The mandrel is a hollow shaft, the left end of the mandrel is fixedly connected with the connecting shaft, the inner side of the right end of the mandrel is connected with the sealing shaft to seal the right end of the mandrel, a water inlet hole is formed in the mandrel, the water inlet hole is communicated with a water inlet assembly, the water inlet assembly comprises a water inlet and a shell communicated with the water inlet, the inner cavity of the shell is of a symmetrical structure, the symmetrical surface is perpendicular to the axis of the mandrel so as to enable the mandrel to be balanced in axial stress, the water inlet assembly is sleeved on the mandrel through the shell, and the inner cavity of the shell is communicated with the water inlet hole of the mandrel;

the connecting shaft is a hollow shaft and is internally arranged on the main shaft, two ends of the connecting shaft are respectively connected with a mandrel of the water braid and a driving drill rod with an axial floating structure, a hexagonal head is arranged at one end, close to the mandrel, of the connecting shaft, the connecting sleeve is fixedly connected to one end, close to the water braid, of the main shaft and is sleeved on the connecting shaft, and a hexagonal hole matched with the hexagonal head is formed in the connecting shaft, so that a sliding connection limiting rotation is formed between the connecting shaft and the connecting sleeve, and the connecting shaft and the mandrel can axially float.

Further, the directional drilling machine power head further comprises a chuck, the chuck is connected to one end, far away from the water swivel, of the main shaft and rotates along with the main shaft, the axial floating structure of the driving drill rod comprises a spring and a drill rod end cover, the driving drill rod is connected with the chuck through a key, the spring is arranged on the end face, close to the chuck, of the driving drill rod so that the driving drill rod can float in the axial direction, and the drill rod end cover is sleeved on the driving drill rod and is fixedly connected with the chuck so as to limit the axial floating distance of the driving drill rod.

Further, the maximum distance between the end face of the driving drill rod, which is close to the chuck, and the end face, which corresponds to the chuck, is set as a, the thread pitch of the threads of the driving drill rod and the drill rod joint connected with the driving drill rod is set as p, and the a is less than or equal to p.

Further, the hexagonal head of the connecting shaft and the middle cylindrical section thereof form uniformly distributed multi-section axial stop end faces, the stop end faces are matched with the end faces, close to the connecting shaft, of the connecting sleeve, and when the driving drill rod axially floats to the leftmost end, the distance between the stop end faces and the end faces, close to the connecting shaft, of the connecting sleeve is b, and b is greater than a.

The utility model has the beneficial effects that:

1. the utility model provides a directional drilling machine power head with rotation angle control and braking functions,

through improving the mechanism of the power head, an angle regulator is arranged on one side of the transmission, which is far away from the main motor, and a transmission shaft in the angle regulator is fixedly connected with the circumference of the driving shaft, so that the angle regulator with the functions of accurately regulating the angle and locking and preventing rotation not only realizes accurate and efficient regulation of the tool face angle, but also can prevent rebound rotation of a main shaft of the power head caused by elastic deformation of a drill rod, and solves the problems that a drilling machine in the prior art lacks a special regulating device for the tool face angle, has low track regulation precision and low efficiency and is difficult to realize automatic directional drilling;

Meanwhile, the driving force required by tool face angle adjustment is greatly reduced, the energy-saving effect is better, the structure of the rotary braking device of the main motor is simplified, the functions of a large number of internal parts are converted into an external rotary speed reducer, the maintenance difficulty is greatly reduced, and the consumption of vulnerable parts is reduced.

2. According to the utility model, the water swivel is integrally connected with the driving drill rod through the connecting shaft, so that the manual loading and unloading of the water swivel in the construction process is avoided, and the water swivel is more suitable for an intelligent drilling machine; the water inlet component in the water braid is connected with the mandrel by adopting the shell symmetrical along the middle surface, so that the water inlet component is stressed and balanced in the axial direction of the mandrel, the stress imbalance of the mandrel support bearing caused by the process that a drilling driving medium enters the mandrel is avoided, the mandrel is connected with the driving drill rod with an axial floating structure through the connecting shaft, the axial impact of the water braid from the drill rod in the drilling process is effectively avoided, the water braid is transmitted to the main shaft and the chuck through the driving drill rod, and the buffer is carried out through the spring, so that the mandrel support bearing is further protected from the axial impact, the service life of the water braid is prolonged, and the equipment maintenance times are reduced.

3. According to the utility model, the drill rod connecting device with the combined driving drill rod and the chuck is adopted, so that the working conditions of drilling and salvaging the drill rod can be rapidly switched by disassembling a small number of parts.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in the following preferred detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a directional drilling machine power head with rotation angle control and braking functions;

FIG. 2 is a schematic cross-sectional view of a directional drilling machine power head with rotation angle control and braking functions according to the present utility model;

FIG. 3 is a schematic view of an angle adjuster according to the present utility model;

FIG. 4 is a schematic view of the driving piston of the angle adjuster of the present utility model;

FIG. 5 is a schematic view of a movable toothed disc of the angle adjuster according to the present utility model;

FIG. 6 is a schematic view of a fixed fluted disc of the angle adjuster of the present utility model;

FIG. 7 is a schematic view of an end cap of an angle adjuster according to the present utility model;

FIG. 8 is a schematic view of a rotary seat of an angle adjuster according to the present utility model;

FIG. 9 is a schematic view of a partially enlarged structure of an angle adjuster according to the present utility model;

FIG. 10 is a schematic view of a water braid in accordance with the present utility model;

fig. 11 is a schematic structural view of a connecting shaft in the present utility model.

Reference numerals: 1-main motor, 2-transmission, 201-drive shaft, 3-angle adjuster, 301-drive shaft, 302-drive piston, 302 a-seal groove, 302 b-large diameter end outer circle, 303-swing reducer, 304-drive piston, 305-fixed toothed disc, 305 a-toothed disc, 305 b-fixed shaft, 306-movable toothed disc, 306 a-boss, 306 b-first helical tooth, 307-angle adjuster end cap, 307 a-maximum outer diameter section, 307 b-mid-diameter section, 307 c-minimum outer diameter section, 307 d-spring mounting hole, 308-bearing gland, 309-spring, 310-swivel, 310 a-swing reducer attachment disc, 310 b-end cap attachment disc, 310 c-groove, 311-flat key, 4-water swivel, 401-mandrel support bearing, 402-mandrel, 403-water intake assembly, 404-bearing housing, 405-grease nipple, 406-distance sleeve, 407-water swivel end cap, 408-cover plate, 409-seal shaft, 5-chuck, 6-driving shaft, 7-attachment shaft, 309-hexagonal head, 702-8-female threaded connection sleeve, 10-female threaded connection sleeve, 8-female connection sleeve.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.

Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the utility model; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present utility model, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 11, the directional drilling machine power head with rotation angle control and braking functions comprises a main motor 1, a speed changer 2, an angle adjuster 3, a water braid 4, a chuck 5, a main shaft 10, a connecting shaft 7, a connecting sleeve 8 and a driving drill rod 6, wherein the main motor 1 is connected with the main shaft 10 through the speed changer 2, the driving drill rod 6 is connected with one end of the main shaft 10 through the chuck 5, the water braid 4 is arranged at one end of the speed changer 2 corresponding to the driving drill rod 6 and is connected with the driving drill rod 6 through the connecting shaft 7 arranged in the main shaft 10, the angle adjuster 3 is arranged at one end of the speed changer 2 corresponding to the main motor 1, and a transmission shaft 301 in the angle adjuster 3 is fixedly connected with a driving shaft 201 in the speed changer 2 in the circumferential direction.

The main motor 1 is one of power sources for driving the active drill pipe 6 to rotate, and the rotary power required by rotary drilling, compound drilling and drill pipe connecting and disconnecting buckle is all from the main motor 1, and the main motor 1 can be various rotary power driving devices, such as: one of the power driving devices such as a hydraulic motor and an electric motor. According to the complex working condition and explosion-proof requirement of the coal mine, the main motor 1 in the embodiment is preferably a hydraulic motor.

The speed changer 2 is a speed change transmission mechanism of the directional drilling machine power head, and mainly transmits the rotating speed and torque output by the main motor 1 and the angle regulator 3 to the main shaft 10 (namely to a drill rod) in a certain transmission ratio, so that the requirements of drilling and drill rod connecting and disconnecting are met. The transmission 2 is typically selected to have a reduction, torque-up transmission function, depending on the existing hydraulic motor technology and drilling requirements. The transmission 2 is provided with a driving shaft 201, one end of the driving shaft 201 is in spline connection with an output shaft of the main motor 1 to realize circumferential fixed connection, the other end of the driving shaft is in spline connection with a transmission shaft 301 in the angle adjuster 3 to realize circumferential fixed connection, and then the rotating speed and torque output by the main motor 1 and the angle adjuster 3 are transmitted to the main shaft 10 and the driving drill rod 6 in a certain transmission ratio, so that the requirements of directional drilling and drill rod connecting and disconnecting are met.

The angle adjuster 3 comprises a transmission shaft 301, a rotary seat 310, a connecting seat 9, a bearing gland 308, a spring 309, a driving piston 302, a transmission piston 304, a fixed fluted disc 305, a movable fluted disc 306, an angle adjuster end cover 307 and a rotary reducer 303 with a self-locking function, wherein the driving piston 302, the transmission piston 304, the fixed fluted disc 305, the movable fluted disc 306 and the angle adjuster end cover 307 are sleeved on the transmission shaft 301 in sequence from left to right, and the transmission ratio of the rotary reducer 303 is larger than that of the transmission 2; the left end of the transmission shaft 301 is provided with a spline, and is inserted into the driving shaft 201 of the transmission 2, and a key groove matched with the spline on the transmission shaft 301 is arranged in the driving shaft 201, so that the transmission shaft 301 and the driving shaft 201 form spline connection, and further form circumferential fixed connection; the right end of the transmission shaft 301 is connected with a fixed fluted disc 305 sleeved on the transmission shaft 301 through a flat key 311 to form a circumferential fixed connection, and is rotationally connected in an angle regulator end cover 307 through a bearing, the angle regulator end cover 307 is positioned on one side of the fixed fluted disc 305 away from the driving shaft 201, namely on the right side of the fixed fluted disc 305, and distance sleeves 406 are respectively arranged on two sides of the bearing, and a bearing gland 308 fixedly connected with the angle regulator end cover 307 through bolts is arranged on one side of the angle regulator end cover 307 away from the fixed fluted disc 305 to position the bearing.

The driving piston 302 is a hollow two-stage stepped shaft, and is sleeved on the transmission shaft 301, a sealing groove 302a is arranged on the outer circle of the small-diameter end, a sealing ring is installed in the sealing groove 302a and is matched with an inner hole of the corresponding position of the connecting seat 9 sleeved on the driving piston 302 to form a first seal, and the outer circle 302b of the large-diameter end is matched with a sealing ring installed in a sealing ring installation groove of the corresponding position of the connecting seat 9 to form a second seal; the first seal and the second seal form a seal cavity Y between the driving piston 302 and the connecting seat 9, an oil inlet communicated with the seal cavity Y is arranged on the connecting seat 9, hydraulic oil enters the seal cavity Y through the oil inlet on the connecting seat 9, the driving piston 302 is pushed to move from a small-diameter end to a large-diameter end, and the small-diameter end of the driving piston 302 is one end close to the driving shaft 201;

preferably, a two-stage stepped inner hole is provided inside the driving piston 302, and a large-diameter inner hole is provided on a side facing the end cover 307 of the angle adjuster, and a shoulder matching with the two-stage stepped inner hole is correspondingly provided on the transmission shaft 301, so as to limit the displacement distance of the driving piston 302 in the axial direction, so as to prevent the movement amount of the driving piston 302 from exceeding the limit.

The driving piston 304 is a disc-shaped part with a central through hole, and is sleeved on the driving shaft 301, the left end is in contact connection with the large diameter end of the driving piston 302, the right end is in contact connection with the moving fluted disc 306, and the driving force of the driving piston 302 (driving force for right end displacement) is mainly transmitted to the moving fluted disc 306, so that the moving fluted disc 306 moves towards the end cover 307 of the angle adjuster.

The main body of the movable fluted disc 306 is a disc-shaped part with a central through hole, a stepped through hole is arranged in the middle of the main body and is used for passing through a transmission shaft 301 and a fixed shaft 305b of the fixed fluted disc 305, one side of the through hole facing the end cover of the angle adjuster is a large-diameter through hole, the inner end surface of the large-diameter through hole is used for bearing the thrust of the end part of the spring 309, the end surface of the movable fluted disc 306 facing one side of the transmission piston 304 is provided with first inclined teeth 306b distributed along the circumference, and the outer circular surface is provided with a boss 306a which is uniformly distributed and is matched with a groove 310c in an inner hole of a rotary seat 310 sleeved on the boss 306 so as to be used for transmitting the rotation and torque of a rotary reducer 303 connected with the rotary seat 310;

the fixed toothed disc 305 has a toothed disc 305a and a fixed shaft 305b located at the center of the toothed disc 305a, the fixed shaft 305b is a hollow shaft, the internal through hole is provided with a key slot, so that the fixed toothed disc 305 and the transmission shaft 301 are in keyed connection, and are fixedly connected in the circumferential direction, so as to limit the rotation between the fixed toothed disc 305 and the transmission shaft 301, the fixed shaft 305b is inserted into the central through hole of the movable toothed disc, the end surface of the toothed disc 305a facing the movable toothed disc 306 is provided with second inclined teeth which are correspondingly meshed with the first inclined teeth 306b of the movable toothed disc 306 and are distributed along the circumferential direction. Specifically, the fixed toothed disc 305 is fixed on the transmission shaft 301 by a flat key 311, so as to prevent the relative rotation between the fixed toothed disc 305 and the transmission shaft 301. The two ends of the fixed fluted disc 305 are axially stopped by means of the shoulder of the transmission shaft 301 and the distance sleeve 406.

The main body of the angle adjuster end cover 307 is of a three-stage stepped hollow disc structure, the main body of the angle adjuster end cover 307 is sleeved on the transmission shaft 301 through a bearing, a maximum outer diameter section 307a is respectively provided with a flange connected with a rotary seat 310 sleeved on the movable fluted disc 306 and a flange connected with a bearing gland 308, a middle diameter section 307b is used for being matched with the rotary seat 310 to be installed and limiting the axial movement distance of the movable fluted disc 306, a minimum diameter section 307c is used for being matched with the movable fluted disc 306 to be installed, namely, a large diameter through hole in the movable fluted disc 306 is matched with the outer circle of the minimum diameter section 307c to form axial sliding connection, the end face of the minimum diameter section 307a is provided with a plurality of mounting holes 307d which are uniformly distributed along the circumference and are used for mounting springs 309, the minimum diameter section 307c is one end, close to the driving shaft 201, of the bearing gland 308 is fixed on the outer side of the angle adjuster end cover 307 through bolts, and axial limiting is carried out on the bearing; the spring 309 is mounted between the angle adjuster end cap 307 and the moving toothed disc 306 through a mounting hole 307d to provide thrust to the moving toothed disc 306 toward the fixed toothed disc 305.

The main body of the rotary seat 310 is cylindrical, and is sleeved on the outer side of the movable fluted disc 306, the left end of the main body is a rotary reducer connecting disc 310a for connecting an output disc of the rotary reducer 303 with a self-locking function, the right end of the main body is an end cover connecting disc 310b for installing the angle adjuster end cover 307, and a middle diameter section 307b in the angle adjuster end cover 307 is matched and connected with an inner cavity of the rotary seat 310 to leave a space for installing the movable fluted disc 306; the inside of the rotary seat 310 is a through hole, and is provided with a groove 310c corresponding to the boss 306a of the movable fluted disc 306, a circumferential fixed connection is formed between the rotary seat 310 and the movable fluted disc 306 through the boss 306a and the groove 310c, and the movable fluted disc 306 can axially displace relative to the rotary seat 310.

The connecting seat 9 is used for connecting the angle adjuster 3 with the speed changer 2, the speed changer 2 is sleeved on the driving shaft 201 and is mainly used for transmitting the torque and rotation of the driving shaft 201 to the main shaft 10, the connecting seat 9 is a hollow cylinder, the outer circle of the connecting seat is divided into three steps of diameters, the diameter of the middle section is maximum, so as to form a middle bulge, the end surfaces at two sides of the middle section are respectively attached to the speed changer 2 and the rotary speed reducer 303 and fixedly connected, so as to realize the relative axial positioning among three elements, wherein the left section (the end close to the driving shaft 201) is inserted into the cavity of the speed changer 2 and is connected with a bearing sleeved on the driving shaft 201 and is used for axial stop of the bearing sleeved on the driving shaft 201, and a sealing groove is arranged on the connecting seat, and the cavity of the speed changer 2 is sealed by installing a sealing ring; the right section extends inward of the swing speed reducer 303 to facilitate installation and guiding of the swing speed reducer 303.

The inner diameter of the connecting seat 9 is also divided into three-level apertures, wherein the inner diameter of the left inner section is matched with the transmission shaft 301 and is provided with a sealing groove, and the transmission 2 is secondarily sealed by installing a sealing ring; the middle inner section and the right inner section are respectively matched with the outer diameter of the two-stage stepped shaft of the driving piston 302, a sealing ring mounting groove is formed in the right inner section, and a sealing ring is mounted, namely, the middle inner section and the right inner section are respectively matched with the small-diameter end outer circle and the large-diameter end outer circle 302b of the driving piston 302, and respectively form a first sealing and a second sealing, so that a sealing cavity Y is formed, wherein a sealing groove 302a corresponding to the middle inner section and provided with the sealing ring is formed on the driving piston 302, a first sealing is formed, a sealing groove is formed in the right inner section, and is matched with the large-diameter end outer circle 302b, so that a second sealing is formed, a sealing cavity Y is formed between the connecting seat 9 and the driving piston 302 through the first sealing and the second sealing, an oil inlet is formed in a position corresponding to the sealing cavity Y on the outer surface of the connecting seat 9, hydraulic oil enters the sealing cavity Y through the oil inlet on the connecting seat 9, the driving piston 302 is pushed to move by the right end, the driving piston 304 and the moving fluted disc 306 are pushed, the spring 309 is further compressed by moving the fluted disc 306, and the meshing between the moving fluted disc 306 and the fixed fluted disc 305 is relieved.

The rotation speed reducer 303 is sleeved on the right section in the connecting seat 9 and is fixedly connected with the middle section of the connecting seat 9, and an output disc (such as a fluted disc or a worm wheel) of the rotation speed reducer 303 is fixedly connected with the rotary seat 310 through a bolt, so that the relative rotation between the output disc of the rotation speed reducer 303 and the rotary seat 310 is limited; the swing speed reducer 303 has two main functions, namely, driving the driving shaft 201 to rotate relatively slowly (compared with the driving of the main motor 1) through the driving shaft 301, and transmitting the rotation through the transmission 2, thereby accurately controlling the rotation angle of the output. Secondly, the rotation speed reducer 303 has a self-locking function, and the self-locking torque of the rotation speed reducer 303 is larger than the output torque of the main motor 1, so that the main motor 1 can be prevented from driving the driving shaft 201 to rotate under the locking working condition, and the whole transmission 2 is locked and prevented from rotating.

Preferably, the rotation reducer 303 is a worm gear rotation reducer with a self-locking function, that is, the rotation reducer connecting disc 310a is connected with a worm wheel serving as an output disc in the worm gear rotation reducer, and the worm wheel is sleeved on the transmission shaft 301 through the connecting seat 9 and the driving piston 302, so as to ensure synchronous rotation of the worm wheel and the rotation seat 310. The transmission ratio of the existing worm and gear rotary speed reducer can reach more than 1:100, however, in the prior art, the lowest rotating speed of a main shaft driven by a main motor 1 (the main shaft is driven by a transmission 14) reaches about 50r/min (300 degrees/s), so that the output rotating speed of the main shaft can be controlled to be within 1/100 of the prior art (less than or equal to 3 degrees/s) through the worm and gear rotary speed reducer by the angle regulator 3, the accurate regulation and the timely stopping are facilitated, and the tool face angle regulation precision and the tool face angle regulation efficiency are greatly improved.

Specifically, the worm and gear rotary speed reducer comprises a driving source, a worm wheel and a slewing bearing, wherein the slewing bearing is sleeved on the connecting seat and fixedly connected with the connecting seat, the worm wheel is rotationally connected with the outer circle of the slewing bearing through a raceway and is in matched connection with the worm, so that the aim that an output disc (namely the worm wheel) of the rotary speed reducer is coaxial with the slewing seat is fulfilled, and the driving source is connected with one end of the worm to drive the worm to rotate; the worm and gear transmission has the characteristic of reverse self-locking, so that the reverse self-locking can be realized, namely, only the worm can drive the worm wheel, but not the worm wheel, so that the worm and gear transmission has the self-locking function. The driving source is an electric motor or a hydraulic motor, and in this embodiment, the driving source is preferably a hydraulic motor, so as to be suitable for complex underground coal mine operation.

In another embodiment, the rotary reducer 303 is any one of a RV reducer, a harmonic reducer, and the like, and the structure of the rotary reducer 303 as an output disc (or referred to as a rotary disc) is fixedly connected to the rotary base 10.

The angle adjuster 3 has two working conditions, and the working principle thereof is as follows:

Locking working conditions: no pressure oil enters a sealing cavity Y formed by the driving piston 302 and the connecting seat 9 from the oil inlet of the connecting seat 9, the driving piston 302 is not driven by external pressure oil supply, and the spring 309 always applies axial force towards the fixed fluted disc 305 to the movable fluted disc 306, so that the helical teeth of the movable fluted disc 306 are kept to be meshed with the helical teeth of the fixed fluted disc 305; at this time, the main motor 1 and the driving shaft 201 are connected with the rotary speed reducer 303 through the transmission shaft 301, the fixed fluted disc 305, the movable fluted disc 306 and the rotary seat 310, and the rotary speed reducer 303 has a self-locking function in the working capacity range (i.e. the self-locking moment of the rotary speed reducer 303 is greater than the output torque of the main motor 1), so that a locking effect is formed on the transmission system of the transmission 2, and the main motor 1 cannot transmit motion through the transmission 2; however, if the swing speed reducer 303 is driven at this time, the swing speed reducer 303 can drive the driving shaft 201 to rotate relatively slowly (compared with the driving of the main motor), and the rotation and torque are transmitted through the transmission 2, so that the rotation angles of the main shaft 10 and the driving drill pipe 6 are accurately controlled, and thus the tool face angle can be accurately and efficiently adjusted.

Unlocking working conditions: the oil inlet of the connecting seat 9 is used for injecting pressure oil into the sealing cavity Y between the driving piston 302 and the connecting seat 9, the driving piston 302 is driven by hydraulic pressure, the driving piston 304 and the movable fluted disc 306 are pushed to move towards the direction of separating from the fixed fluted disc 305, at the moment, the spring 309 is extruded by the movable fluted disc 306 to shrink, the movable fluted disc 306 is disengaged from the inclined teeth of the fixed fluted disc 305, and the self-locking effect of the rotary speed reducer 303 cannot be transmitted to the transmission shaft 301, the driving shaft 201 and the main motor 1. Thus, the main motor 1 can drive the drive shaft 201 to rotate, thereby outputting rotation and torque through the transmission 2.

The water braid 4 is a water inlet device for drilling driving water, driving water enters the spindle 10 of the power head through the water braid 4, and then reaches the drill bit position through a plurality of connected drill rods, the water braid 4 is mainly characterized by being balanced in axial force and comprising a mandrel 402, a water inlet assembly 403, a bearing seat 404, a sealing shaft 409 and a mandrel support bearing 401, the water inlet assembly 403 is sleeved on the mandrel 402 and is rotationally connected, the bearing seat 404 is sleeved on the mandrel 402 and is rotationally connected through the mandrel support bearing 401 which is internally arranged at two ends of the bearing seat 404, and the sealing shaft 409 is connected to the right end of the mandrel 402 through threads so as to seal the right end of the mandrel 402.

The mandrel 402 is a hollow shaft, the left end of the mandrel is fixedly connected with the connecting shaft 7 through threads, wherein the threads on the mandrel 402 are external threads, the threads on the connecting shaft 7 are internal threads, a water inlet hole is formed in the middle of the mandrel 402 and communicated with the water inlet component 403, and a mounting thread for mounting the sealing shaft 409 is formed in the right end of the mandrel;

the water inlet assembly 403 includes a water inlet and a housing in communication with the water inlet. The water inlet is used for connecting a water pipe joint, the shell is sleeved on the mandrel and is rotationally connected, the inner cavity of the shell is communicated with the water inlet hole of the mandrel 402, the shell is matched with the bearing seat 404, namely, one side of the shell is connected with one side of the bearing seat 404 to form a mandrel mounting structure, meanwhile, the inner cavity of the shell is of a symmetrical structure, and the symmetrical surface is perpendicular to the axis of the mandrel 402 so that the axial stress of the mandrel is balanced, and therefore the axial stress balance of the water braid 4 can be realized. Because the inner cavity of the housing in the water inlet assembly 403 is completely symmetrical about the middle surface, the acting force of the driving water on the water inlet assembly 403 is balanced in the axial direction of the mandrel, so that the stress condition of the mandrel support bearing 401 is improved, and the service life is prolonged.

Preferably, a sealing ring is provided between the housing and the mandrel 402 to form a sealing structure.

Specifically, a cover plate 408 is mounted at the right end of the mandrel 402 by a screw, so as to axially fix a sealing shaft 409, and a water braid end cover 407 is mounted at the right end of the bearing seat 404 by a screw, so as to axially fix the mandrel support bearing 401. A grease nipple 405 communicated with the inner cavity of the bearing seat 404 is arranged on the bearing seat 404. The joint of the sealing shaft 409 and the mandrel 402 is also provided with a sealing ring for sealing, so as to prevent water leakage.

The connecting shaft 7 is a hollow shaft, is internally arranged in the main shaft 10, and has two ends respectively connected with the mandrel 402 of the water braid 4 and the driving drill rod 6, so that the axial impact received by the water braid 4 is transferred to the driving drill rod 6 with an axial floating structure, and the stress condition of the water braid 4 is improved. An external thread 701 is arranged at the left end of the connecting shaft 7 and is used for being connected with a threaded hole at the right end of the driving drill rod 6, and an internal thread 703 is arranged at the right end of the connecting shaft 7 and is used for being connected with an external thread of the water swivel mandrel 402; the outer side of the right end of the connecting shaft 7 is provided with a hexagonal head 702, the connecting sleeve 8 is fixedly connected with one end, close to the water swivel 4, of the main shaft 10 of the power head through threaded connection, an inner hole of the connecting sleeve 8 is a hexagonal hole matched with the hexagonal head 702, the hexagonal head 702 at the right end of the connecting shaft 7 is inserted into the hexagonal hole of the connecting sleeve 8, so that a movable pair is formed between the connecting sleeve 8 and the connecting shaft 7 and rotation of the connecting shaft 7 is limited, a movable pair is formed between the connecting sleeve 8 and the connecting shaft 7 and is matched with an axial floating structure of the driving drill rod 6 for limiting displacement, and the whole of the mandrel 402, the connecting shaft 7 and the driving drill rod 6 also has an axial floating structure for limiting displacement, so that the mandrel 402 in the connecting shaft 7 and the water swivel 1 also has an axial floating function.

The axial floating structure of the driving drill rod 6 comprises a spring and a drill rod end cover, the driving drill rod 6 can be connected with the chuck 5 through a mode of transmitting torque such as a spline and a flat key, a spring mounting hole is formed in the right end face of the driving drill rod 6, a spring is mounted between the driving drill rod 6 and the chuck 5 through the spring mounting hole, the driving drill rod 6 has an axial floating function and is used for buffering axial impact, and the drill rod end cover fixedly connected to the chuck 5 is used for limiting the axial direction, so that the driving drill rod 6 has an axial floating function for limiting displacement.

Specifically, let the maximum distance between the right end surface of the driving drill rod 6 and the left end surface corresponding to the chuck 5 be a, and the pitch of the threads of the driving drill rod 6 and the drill rod joint connected with the driving drill rod 6 be p, where a is less than or equal to p. Because the axial impact of the thread-engaging fastener must occur within the displacement of one thread pitch (of course, it is highly likely that each thread pitch will impact), one fastener (one thread pitch) will not engage, and subsequent threads will certainly not be able to engage. However, the floating distance should not be too small, and if too small, the floating distance is insufficient, the floating buffer effect is not exerted. Thus, the minimum value of a is chosen to be slightly greater than 0.5p, preferably a e [0.65p,0.95p ], most preferably 0.65p, based on the substantially symmetrical nature of the thread sides.

The hexagonal head 702 and the middle cylindrical section of the connecting shaft 7 naturally form uniformly distributed multi-section axial stop end surfaces, which cooperate with the left end surface of the connecting sleeve 8 to limit the rightward axial displacement of the connecting shaft 3. If the distance from the stop end face to the left end face of the connecting sleeve 8 is b when the driving drill rod 6 and the connecting shaft 7 are positioned at the forefront under the floating action, b > a should be provided. Because the distance setting party can play a role of the active drill rod floating function, the impact to the right in the axial direction is prevented from being directly transmitted to the mandrel support bearing through the connecting shaft 7. In addition, the distance b is appropriately larger (i.e. cannot be too much larger) than the distance a between the active drill rod and the chuck end face, preferably b is larger than or equal to a+0.35p, so that even if a selects the minimum optimal value of 0.65p, the buffer distance of more than one screw pitch can be ensured, the axial buffer structure has a better buffer protection effect, and the displacement to the right of the connecting shaft 3 can be limited under the extreme condition that the floating function of the active drill rod fails or the active drill rod and the chuck end face are crushed, so that serious damage to the chuck 6 or other parts of the power head is avoided.

The main shaft 10 is arranged in a box body of the transmission 2 and is driven by the transmission 2 to rotate, one end of the main shaft 10, which is far away from the water swivel 4, is connected with the chuck 5 to drive the chuck 5 to rotate, and then the chuck 5 transmits torque to the driving drill rod 6. Namely the active drill pipe 6, the connecting shaft 7, the connecting sleeve 8 and the mandrel 1402, the sealing shaft 409 and the cover plate 408 in the water swivel 4 are all rotated in the water inlet assembly 403, the bearing housing 404, the water swivel end cap 407 and the housing of the transmission 2.

Through the connection relationship, the water braid 4 can achieve axial force balance in the drilling process, so that the problem that the mandrel support bearing 401 is easy to damage is solved, and the working principle is as follows:

the drilling driving water is connected into the mandrel 402 from the water inlet assembly 403, and directly reaches the hole bottom motor and the drill bit after passing through the mandrel 402, the connecting shaft 7 and the driving drill rod 6; firstly, because the inner cavity of the shell of the water inlet component 403 is completely symmetrical about the middle surface, the acting force of the driving water on the water inlet component 403 is balanced in the axial direction of the mandrel 402, so that the stress condition of the mandrel support bearing 401 is greatly improved, and the service life is prolonged;

secondly, the mandrel 402 of the water braid 4 is connected with the driving drill rod 6 through the connecting shaft 7, the hexagonal heads and the hexagonal holes of the connecting shaft 7 and the connecting sleeve 8 are matched to form a stable moving pair, relative rotation is prevented, the axial floating function of limiting displacement is matched with that of the driving drill rod 6, axial impact received in the drilling process of the driving drill rod 6 can be buffered in a front-back floating mode, the axial floating distances of the driving drill rod 6, the connecting shaft 7 and the mandrel 402 are limited, other relevant parts are protected, the connecting shaft 7 and the mandrel 402 have axial floating displacement, therefore, the water braid 4 (the mandrel 402) moves axially along with the driving drill rod 6 and the connecting shaft 7 in the axial direction in the rotating process of the driving drill rod 6 and the drilling process of the driving drill rod 10, the received axial impact is transmitted to the driving drill rod 6, and the driving drill rod 6 is absorbed in a damping mode through a spring arranged between the driving drill rod 6 and the spindle 10, and accordingly the stress condition of the mandrel supporting bearing 401 is further improved.

The axial displacement limitation of the drill rod end cover on the driving drill rod 6 can be adaptively adjusted according to the actual needs of other related parts so as to adapt to different coal mine drilling machines.

In summary, the solution of the symmetrical housing cavity of the water inlet assembly in the water braid 4 in combination with the connecting shaft 7 to transfer the impact to the active drill pipe 6 with the floating function improves the stress condition of the mandrel support bearing 401, the axial force generated by the pressure of the drilling driving water in the water braid 4 is distributed in a balanced manner, and the working impact of the power head is borne by the active drill pipe 6 with the floating function, so that the drilling driving water pressure balancing mechanism solves the problems that the hydraulic pressure in the water braid of the existing drilling machine is unbalanced, the force transmission mechanism is not available, the mandrel support bearing 401 is easy to damage, and the drilling driving water pressure balancing mechanism is particularly suitable for the condition that the drilling driving water pressure is higher, such as the condition that slurry pulse is used in directional drilling.

The chuck 5 is a drill rod clamping mechanism of the directional drilling machine power head, and in general, the chuck 5 in the embodiment does not bear the work of clamping drill rod drilling, so that a normally open chuck is preferred. So that when the drill rod with a larger diameter needs to be temporarily replaced or the drill rod is salvaged in the underground drilling process, the driving drill rod 6 at the front end of the chuck 5 is detached, and the chuck 5 is used for clamping the corresponding drill rod for construction. Specifically, a piston type hydraulic chuck as disclosed in chinese patent publication No. CN105822238B is preferably employed.

The driving drill rod 6 is a drill rod connecting mechanism during normal drilling, the front end of the driving drill rod 6 is provided with a threaded joint which is the same as a drill rod male joint, the driving drill rod 6 is used for being connected with a drill rod which is connected into a drilling machine in a sleeved mode during drilling, the driving drill rod is limited to axially displace through a drill rod end cover and a bolt connection at the front end of the chuck 5, and a spring is arranged between the driving drill rod 5 and the chuck 6 so that the driving drill rod 5 has an axially floating function.

In another embodiment, the driving drill rod 6 is directly connected to the main shaft 10, and the specific structure of the driving drill rod 6 is as a floatable drill rod connecting device disclosed in chinese patent publication No. CN112253017B, which also has axial floating kinetic energy to meet the requirement that one end of the connecting shaft 7 is connected to the driving drill rod with an axial floating structure, where the key point is that the driving drill rod 6 is transferred from being connected to the chuck 5 to being connected to the main shaft 10, and the other details are disclosed in the above patent and are not repeated herein.

The directional drilling machine power head with the rotation angle control and braking functions can provide various operation conditions for a drilling machine, including sliding directional drilling, tool face angle adjustment, rotary drilling, compound drilling and salvaging of drill rods, and the working principle is as follows:

(1) Sliding directional drilling

Under the sliding directional drilling working condition, the angle regulator 3 is in a locking working condition, and the main shaft 10 cannot rotate under the drive of the main motor 1; the power head is connected with a plurality of drill rods through a driving drill rod 6, and a hole bottom motor is arranged at the front end of the drill rod at the forefront end. The drilling driving medium (pressure fluid) enters the power head from the water braid 4, sequentially passes through the connecting shaft, the driving drill rod and the drill rod and enters the hole bottom motor, drives the hole bottom motor to rotate, and implements sliding directional drilling.

(2) Tool face angle adjustment

Under the tool face angle adjusting working condition, the angle adjuster 3 is in a locking working condition, the main shaft 10 cannot rotate under the driving of the main motor 1, but can only rotate under the driving of the rotary speed reducer 303, and oil is not supplied to the main motor 1 at this time, and oil is supplied to the hydraulic motor in the rotary speed reducer 303.

The rotation speed reducer 303 drives the transmission shaft 301 to rotate, and drives the main shaft 10 and the driving drill rod 6 to rotate through the driving shaft 201 in the transmission 2, and the driving drill rod 6 drives the drill rod connected with the driving drill rod to rotate, so that the adjustment of the tool face angle is realized. Since the swing speed reducer 303 has a larger transmission ratio, and the transmission ratio of the transmission 2 is added, efficient and accurate tool face angle adjustment can be realized by controlling the rotation speed of the swing speed reducer 303.

(3) Rotary drilling

Under the rotary drilling working condition, the angle regulator 3 is in the unlocking working condition, the main shaft 10 can rotate under the driving of the main motor 1, the main motor 1 can be supplied with oil to drive the main shaft 10 and the drill rod to rotate, rotary drilling is implemented, and at the moment, driving media are not provided for the hole bottom motor through the water swivel 4.

(4) Composite drilling

Under the composite drilling working condition, the angle regulator 3 is in an unlocking working condition, and the main shaft 10 can rotate under the drive of the main motor 1. At this time, not only provides driving medium to the hole bottom motor through the water braid 4, and then drives the hole bottom motor to rotate, but also drives the drill rod to rotate through the main motor 1, so as to realize compound drilling.

(5) Salvaging drill rod

When the drill loss accident occurs, the salvaging drill rod is needed to take out the drill rod in the hole. The diameter of the salvaging drill rod is generally larger than that of the construction drill rod, so that the salvaging drill rod is required to be clamped by the chuck 5 for construction. Under the working condition of the salvaging drill rod, the driving drill rod 6, the connecting shaft 7, the water swivel 4 and the like are removed, the salvaging drill rod is installed in the power head, the salvaging drill rod is clamped by the chuck 5, and then a plurality of salvaging drill rods are sequentially connected until the salvaging drill rods are in contact with the lost drill rod in the hole. In this condition, the angle adjuster 3 is in an unlock condition, and the spindle 10 can be rotated by the main motor 1.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.

Claims (10)

1. The utility model provides a directional drilling machine unit head with rotation angle control and braking function, includes main motor, derailleur and main shaft, and the derailleur has the drive shaft, the main motor is connected to the one end of drive shaft, just the drive shaft passes through the gear in the derailleur and realizes meshing transmission with the main shaft, its characterized in that: the other end of the driving shaft is connected with an angle regulator through a transmission;

the angle adjuster comprises a transmission shaft, a driving piston, a fixed fluted disc, a movable fluted disc, an angle adjuster end cover, a rotary seat, a connecting seat and a rotary speed reducer with a self-locking function, wherein one end of the transmission shaft is fixedly connected with the circumference of the transmission shaft, the other end of the transmission shaft is rotatably connected in the angle adjuster end cover through a bearing sleeved on the transmission shaft, a bearing gland is arranged at one end, far away from the transmission shaft, of the angle adjuster end cover, the driving piston, the fixed fluted disc and the movable fluted disc are sleeved on the transmission shaft, the driving piston is positioned at one end, close to the transmission shaft, of the transmission shaft, one end, far away from the transmission shaft, of the driving piston is connected with the movable fluted disc, the fixed fluted disc is fixedly connected with the transmission shaft in the circumference, and the fixed fluted disc is positioned between the driving piston and the movable fluted disc;

The movable fluted disc is a disc-shaped part with a central through hole, the central through hole is a stepped through hole, one side of the stepped through hole, facing the end cover of the angle regulator, is provided with a large-diameter through hole, the movable fluted disc is sleeved on the end cover of the angle regulator through the large-diameter through hole and is in sliding connection with the end cover of the angle regulator, the end surface, facing the driving piston, of the movable fluted disc is provided with first helical teeth distributed along the circumference, the fixed fluted disc is provided with second helical teeth meshed with the first helical teeth, and a spring is arranged between the inner end surface of the large-diameter through hole and the end surface of the end cover of the angle regulator, opposite to the inner end surface, so that the first helical teeth and the second helical teeth are meshed under the thrust of the spring;

the outer circular surface of the movable fluted disc is provided with evenly distributed bosses, the rotary seat is sleeved on the movable fluted disc and is provided with grooves matched with the bosses so as to be fixedly connected with the circumference of the movable fluted disc, and one end of the rotary seat is provided with a rotary reducer connecting disc fixedly connected with an output disc of the rotary reducer so as to transfer the rotation of the output disc in the rotary reducer to the movable fluted disc;

the connecting seat is sleeved on the driving piston, the outer circle of the connecting seat is divided into three-stage diameters, the diameter of the middle section is the largest, the end faces on two sides of the middle section are respectively connected with the speed changer and the rotary speed reducer so as to realize relative axial positioning among the speed changer, the connecting seat and the rotary speed reducer, the inner diameter of the connecting seat is divided into three-stage apertures, wherein the two-stage apertures far away from the speed changer are matched with the outer diameter of the driving piston and sleeved on the driving piston, and the output disc of the rotary speed reducer is coaxial with the rotary seat;

The driving piston is a two-stage stepped shaft, a sealing groove is arranged on the outer circle of the small diameter end of the driving piston, a sealing ring is installed in the sealing groove and matched with the corresponding position of a connecting seat sleeved on the sealing groove to form a first seal, the outer circle of the large diameter end is matched with the sealing ring installed on the corresponding position of the connecting seat to form a second seal, a sealing cavity between the driving piston and the connecting seat is formed between the first seal and the second seal, and an oil inlet communicated with the sealing cavity is formed in the connecting seat, so that the driving piston pushes a movable fluted disc towards the end cover direction of the angle regulator under the action of hydraulic oil entering the sealing cavity through the oil inlet.

2. The directional drilling machine power head with rotation angle control and braking function according to claim 1, characterized in that: and a transmission piston is further arranged between the driving piston and the movable fluted disc, the transmission piston is sleeved on the transmission shaft and is in sliding connection with the transmission shaft, one end of the transmission piston is connected with the driving piston, and the other end of the transmission piston is connected with the movable fluted disc so as to transmit the thrust of the driving piston.

3. The directional drilling machine power head with rotation angle control and braking function according to claim 1, characterized in that: the rotary seat is cylindrical, and one end of the rotary seat, which is far away from the rotary speed reducer connecting disc, is provided with an end cover connecting disc which is fixedly connected with the angle regulator end cover.

4. The directional drilling machine power head with rotation angle control and braking function according to claim 1, characterized in that: the fixed fluted disc is provided with a fluted disc and a fixed shaft positioned at the center of the fluted disc, the second inclined teeth are arranged on the fluted disc, the fixed shaft is inserted into a central through hole of the movable fluted disc, and a key slot is arranged in the fixed shaft, so that the fixed fluted disc is fixedly connected with the circumference of the transmission shaft through key connection.

5. The directional drilling machine power head with rotation angle control and braking function according to claim 1, characterized in that: the angle regulator end cover is of a three-stage stepped hollow disc structure, the angle regulator end cover is arranged on a transmission shaft through a bearing sleeve, a flange connected with the rotary seat is arranged on the maximum outer diameter section of the angle regulator end cover, the maximum outer diameter section is located at one end far away from the transmission shaft, the middle diameter section is used for bearing the rotary seat and limiting the axial movement distance of the movable fluted disc, the minimum diameter section is axially and slidably connected with a large-diameter through hole of the movable fluted disc, and a plurality of spring mounting holes which are used for mounting springs and uniformly distributed along the circumference are formed in the end face of the minimum diameter section.

6. The directional drilling machine power head with rotation angle control and braking function according to claim 1, characterized in that: the driving shaft is arranged in the speed changer, one side end face of the middle section in the connecting seat is connected with the speed changer, one section of the connecting seat, which is close to the speed changer, is inserted into the speed changer and serves as axial stop of a bearing sleeved on the driving shaft, and one section of the connecting seat, which is close to the rotary speed reducer, extends to the inside of the rotary speed reducer so as to be used for installation and guide of the rotary speed reducer.

7. The directional drilling machine power head with rotation angle control and braking function according to claim 1, characterized in that: the water swivel comprises a mandrel, a water inlet assembly, a bearing seat, a sealing shaft and a mandrel supporting bearing, wherein the water inlet assembly is sleeved on the mandrel and is rotationally connected, and the bearing seat is sleeved on the mandrel and is rotationally connected through mandrel supporting bearings which are arranged at two ends of the bearing seat;

the mandrel is a hollow shaft, the left end of the mandrel is fixedly connected with the connecting shaft, the inner side of the right end of the mandrel is connected with the sealing shaft to seal the right end of the mandrel, a water inlet hole is formed in the mandrel, the water inlet hole is communicated with a water inlet assembly, the water inlet assembly comprises a water inlet and a shell communicated with the water inlet, the inner cavity of the shell is of a symmetrical structure, the symmetrical surface is perpendicular to the axis of the mandrel so as to enable the mandrel to be balanced in axial stress, the water inlet assembly is sleeved on the mandrel through the shell, and the inner cavity of the shell is communicated with the water inlet hole of the mandrel;

the connecting shaft is a hollow shaft and is internally arranged on the main shaft, two ends of the connecting shaft are respectively connected with a mandrel of the water braid and a driving drill rod with an axial floating structure, a hexagonal head is arranged at one end, close to the mandrel, of the connecting shaft, the connecting sleeve is fixedly connected to one end, close to the water braid, of the main shaft and is sleeved on the connecting shaft, and a hexagonal hole matched with the hexagonal head is formed in the connecting shaft, so that a sliding connection limiting rotation is formed between the connecting shaft and the connecting sleeve, and the connecting shaft and the mandrel can axially float.

8. The directional drilling machine power head with rotation angle control and braking function according to claim 7, characterized in that: the chuck is connected to one end of the main shaft far away from the water swivel and rotates along with the main shaft, the axial floating structure of the driving drill rod comprises a spring and a drill rod end cover, the driving drill rod is connected with the chuck through a key, the spring is arranged on the end face, close to the chuck, of the driving drill rod so that the driving drill rod can float in the axial direction, and the drill rod end cover is sleeved on the driving drill rod and fixedly connected with the chuck so as to limit the axial floating distance of the driving drill rod.

9. The directional drilling machine power head with rotation angle control and braking function according to claim 8, characterized in that: and setting the maximum distance between the end surface of the driving drill rod, which is close to the chuck, and the end surface corresponding to the chuck as a, wherein the thread pitch of the threads of the driving drill rod and the drill rod joint connected with the driving drill rod is p, and the a is less than or equal to p.

10. The directional drilling machine power head with rotation angle control and braking function according to claim 9, characterized in that: the hexagonal head of the connecting shaft and the middle cylindrical section form a plurality of sections of uniformly distributed axial stop end faces, the stop end faces are matched with the end faces, close to the connecting shaft, of the connecting sleeve, and when the driving drill rod axially floats to the leftmost end, the distance between the stop end faces and the end faces, close to the connecting shaft, of the connecting sleeve is b, and b is greater than a.