CN221400379U - Support for hydraulic jumbolter - Google Patents

Abstract

The utility model discloses a bracket for a hydraulic jumbolter, which comprises a triangular bottom plate and a triangular top plate, wherein a through hole for a drill to be inserted is formed in the center of the top plate in a penetrating manner, and the diameter of the through hole is larger than that of the drill; a limiting sleeve concentric with the top plate is arranged between the bottom plate and the top plate, the inner diameter of the limiting sleeve is matched with the diameter of the outer wall of the drilling machine, and the circumferential surface of the limiting sleeve is connected with three supporting rods; the bottom of bottom plate is fixed with the arc base, and the inside slidable mounting of arc base has first slider, and the top integrated into one piece of first slider is connected with the drum seat, and when the drum seat was arranged in to the rig bottom and limit sleeve is fixed, under the action of gravity, rig, first slider and limit sleeve three can remain in vertical state throughout for the bottom plate. The support provided by the utility model can keep the roof bolter in a vertical state on the support all the time, ensure that all drilling directions in a roadway are all vertical upwards, avoid crossing during anchor cable support and ensure the qualification rate of drilling operation.

Description

Support for hydraulic jumbolter

Technical Field

The utility model relates to the technical field of mining supporting equipment, in particular to a bracket for a hydraulic jumbolter.

Background

Although the existing underground anchor cable support has an excavating and anchoring machine to replace a single hydraulic anchor machine, the single hydraulic anchor machine cannot be completely replaced, and is widely applied to the support operation of coal mines due to the flexibility of the single hydraulic anchor machine, and the hydraulic anchor machine is a machine which uses liquid as a working medium and is used for transmitting energy to realize various processes. Because the drilling machine is heavy, the professional quality of an operator is strictly required during drilling operation, the drilling machine is inclined by a little carelessness, the drilling machine is required to be frequently moved by personnel on an operation site, the weight of the drilling machine can also increase the labor force of workers, so that the operators usually put the drilling machine on a bracket for saving labor, the drilling machine is carried by casters at the bottom of the bracket instead of the transportation, the labor force is reduced, the roadway is fluctuated due to the factors such as geology, when the fluctuated angle of the roadway is large, the drilling machine is always parallel to the roadway because the bracket is always vertical to the bracket, the drilled holes of the drilling machine are not vertical, the length of each anchor cable is 8 meters, and according to the interval row spacing requirement (two meters and one row) of the support, if the drilling holes are slightly inclined, the anchor cable crossing phenomenon exists, the drilled holes are invalid during the post support, and the workers need to drill again.

Disclosure of utility model

In order to solve the technical problems in the prior art, the utility model provides a bracket for a hydraulic jumbolter.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the bracket for the hydraulic jumbolter comprises a triangular bottom plate and a triangular top plate, wherein the bottom plate and the triangular top plate are distributed in parallel in the vertical direction, the top plate and the triangular bottom plate are fixedly connected through three uniformly distributed support rods, a through hole for the insertion of the drill is formed in the center of the top plate in a penetrating manner, and the diameter of the through hole is larger than that of the drill;

A limiting sleeve concentric with the top plate is arranged between the bottom plate and the top plate, the inner diameter of the limiting sleeve is matched with the diameter of the outer wall of the drilling machine, and the circumferential surface of the limiting sleeve is connected with three supporting rods;

The bottom of bottom plate is fixed with the arc base, and the inside slidable mounting of arc base has first slider, and the top integrated into one piece of first slider is connected with the drum seat, and when the drum seat was arranged in to the rig bottom and limit sleeve is fixed, under the action of gravity, rig, first slider and limit sleeve three can remain in vertical state throughout for the bottom plate.

Preferably, the limit sleeve is respectively connected with the three support rods through two connecting rods with the same specification and one telescopic rod;

One end of each connecting rod is fixedly connected with the supporting rod, and the other end of each connecting rod is connected with the circumferential surface of the limiting sleeve in a ball joint manner;

The inner side of the supporting rod corresponding to the telescopic rod is provided with a second limit groove along the length direction of the supporting rod, a second sliding block is slidably arranged in the second limit groove, the fixed end of the telescopic rod is connected with the circumferential surface of the limit sleeve in a ball joint manner, the movable end of the telescopic rod is hinged with the second sliding block, the second sliding block is of a T-shaped structure as a whole, and the shape of the second limit groove is matched with the shape of the second limit groove.

Preferably, the extending direction of the arc-shaped base corresponds to one of the support rods, and the support rods are connected with the telescopic rods;

The inside slidable mounting of arc base has first slider, and the top integrated into one piece of first slider is connected with the drum seat, and this drum seat and the diameter looks adaptation of rig bottom.

Preferably, the bottom of the bottom plate is also annularly provided with three casters.

Preferably, the side part of the bottom plate is provided with a storage groove corresponding to the position of each caster, the top of each caster is fixedly connected with a fixed shaft along the vertical direction, the position of the fixed shaft close to the top of the fixed shaft is fixedly connected with a rotating shaft along the direction vertical to the axial direction of the fixed shaft, and the fixed shaft is rotatably arranged in the storage groove through the rotating shaft.

Preferably, a turntable is rotatably arranged at the inner center of the bottom plate, three bulges are uniformly distributed on the circumferential surface of the turntable in a ring shape, the three bulges and the turntable are integrally formed into a special-shaped cam, and a whole circle of guide groove is formed on the outer side surface of the special-shaped cam;

Each fixed shaft is connected with the rotary table through a push-pull rod, wherein a third limit groove is formed on the circumferential surface of one side of the fixed shaft facing the rotary table, the third limit groove is distributed along the axial direction of the fixed shaft, one end of the fixed shaft extends to the inside of the third limit groove to be connected with the inside of the third limit groove in a sliding fit manner, the other end of the push-pull rod penetrates through the bottom plate to extend to the inside of the bottom plate to be fixedly connected with a sliding column, and the sliding column is arranged in the guide groove to be connected with the inside of the guide groove in a sliding manner;

The guide slot is of a T-shaped structure, the height of the inner side of the guide slot is the same as that of the sliding column, the height of the outer side of the guide slot is the same as that of the push-pull rod, and the inner part of the third limit slot is also of a T-shaped structure, so that the push-pull rod always slides in the third limit slot.

Preferably, the top of carousel is followed vertical direction fixedly connected with stand, and the stand upwards extends and runs through the bottom plate outside, and the up end of bottom plate is formed with the first spacing groove with stand rotation orbit looks adaptation, and the bottom plate top is provided with the pneumatic cylinder, and the adapter sleeve that the active end of pneumatic cylinder is connected cup joints on the stand, and the stiff end of pneumatic cylinder articulates on the lining seat, and the lining seat then rotates to be installed at the bottom plate top.

Preferably, the fixed shaft is in a vertical state, one end of the push-pull rod is positioned at the topmost part of the third limiting groove, the sliding column is positioned at the position where the turntable is connected with the bulge in the guide groove, and when the sliding column slides to the outermost side of the bulge, the fixed shaft rotates from the vertical state to the horizontal state.

Compared with the prior art, the utility model provides the bracket for the hydraulic jumbolter, which has the following beneficial effects:

(1) According to the support for the hydraulic jumbolter, the jumbolter is finally located in the cylinder seat after being inserted from the limiting sleeve, when the jumbolter needs to be supported on an inclined roadway, personnel firstly adjust the orientation of the whole support, the support rod connected with the telescopic rod faces the right front of the roadway, then the support is pushed onto the inclined roadway, when the support slides on the roadway, the jumbolter swings relative to the support under the action of gravity, at the moment, the second sliding block slides downwards in the second limiting groove, at the moment, the first sliding block rotates anticlockwise in the arc-shaped base, and finally the jumbolter is kept in a vertical state under the action of gravity, so that all drilling directions in the roadway are enabled to be all vertical upwards, the cross is avoided when the anchor rope is supported, and the qualification rate of drilling operation is guaranteed.

(2) When the roof bolter carries out the operation of strutting on the tunnel of slope, the pneumatic cylinder drives the carousel and rotates, carousel pivoted in-process, protruding and traveller contact, and then drive push-and-pull rod outside removal, when the traveller slides to bellied outside, the fixed axle can be rotated to the horizontality by vertical state, and three truckles break away from ground, bottom plate and tunnel laminating are in the same place to increase area of contact, promote the stability of support.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate and together with the embodiments of the utility model and do not constitute a limitation to the utility model, and in which:

FIG. 1 is a schematic view of a hydraulic jumbolter according to an embodiment of the present application mounted in a frame;

FIG. 2 is a schematic view of a stand for an entire hydraulic jumbolter in accordance with an embodiment of the present application;

FIG. 3 is a schematic diagram illustrating the connection of a limiting sleeve and a supporting rod in an embodiment of the present application;

FIG. 4 is a schematic diagram showing the distribution of structures on a base plate according to an embodiment of the present application;

FIG. 5 is a schematic view of the structure of the inner part of the bottom plate according to the embodiment of the application;

FIG. 6 is a schematic view of an assembly of three casters and turntable in an embodiment of the present application;

FIG. 7 is a schematic view of a connection between a push-pull rod and a fixed axle of a caster in an embodiment of the present application.

In the figure: 1. a bottom plate; 2. a support rod; 3. a top plate; 4. a roof bolter; 5. a limit sleeve; 6. a connecting rod; 7. an arc-shaped base; 8. casters; 10. a first slider; 11. a cylinder seat; 12. a hydraulic cylinder; 13. a first limit groove; 14. a telescopic rod; 15. the second limit groove; 16. a second slider; 17. a turntable; 18. a column; 19. connecting sleeves; 20. a fixed shaft; 21. a storage groove; 22. a push-pull rod; 23. a guide groove; 24. a spool; 25. a third limit groove; 26. a rotating shaft; 27. a protrusion.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

Referring to fig. 1-7, the present embodiment provides a bracket for a hydraulic anchor rod, which includes a triangle-shaped bottom plate 1 and a triangle-shaped top plate 3, wherein the bottom plate 1 and the triangle-shaped top plate 3 are distributed in parallel in a vertical direction, the top plate 3 and the bottom plate 1 are fixedly connected through three support rods 2 which are uniformly distributed, wherein a through hole for inserting an anchor rod machine 4 is formed in a center of the top plate 3, and the diameter of the through hole is larger than that of the anchor rod machine 4, so that the anchor rod machine 4 has enough activity allowance when inclining. Still be provided with spacing sleeve 5 between bottom plate 1 and roof 3, spacing sleeve 5 and roof 3 arrange with one heart to the internal diameter of this spacing sleeve 5 links to each other with the outer wall diameter looks adaptation of roof-bolter 4, the periphery of spacing sleeve 5 and three bracing piece 2, the base that is used for supporting roof-bolter 4 is then installed to the bottom of bottom plate 1, before roof-bolter 4 is before using, pass it in proper order roof-bolter 3, spacing sleeve 5 and place on the base, through the height of control spacing sleeve 5, make its cover in the 2/3 department of roof-bolter 4 height, guarantee the stability of roof-bolter 4, and the bottom of bottom plate 1 still annular distributes has three truckle 8, in the in-process of transportation, can avoid personnel to carry by means of truckle 8, save the labour.

In the tunneling process, due to factors such as geology, the tunnel can have high and low fluctuation, and under extreme conditions, the fluctuation of the tunnel can be very big, at this moment, when the hydraulic bolter 4 carries out anchor rope support on the inclined tunnel, stability of the hydraulic bolter 4 can be drastically reduced when singly adopting the bolter 4, but when using the support, the drilling direction of the bolter 4 must be guaranteed to be in the vertical direction, the anchor rope is avoided producing the intersection in the roof, at this moment, the limit sleeve 5 just needs to be capable of carrying out certain angle's swing for the bottom plate 1, it is in the vertical direction all the time, and the bottom of the bolter 4 also can correspondingly slide for the base.

In order to achieve the above purpose, the limiting sleeve 5 of the present application is respectively connected with three supporting rods 2 through two connecting rods 6 and a telescopic rod 14 with the same specification, wherein one end of each connecting rod 6 is fixedly connected with the supporting rod 2, the other end is connected with the circumferential surface of the limiting sleeve 5 in a ball connection manner, a second limiting groove 15 is formed on the inner side of the supporting rod 2 corresponding to the telescopic rod 14 along the length direction of the supporting rod, a second sliding block 16 is slidably mounted in the second limiting groove 15, the fixed end of the telescopic rod 14 is connected with the circumferential surface of the limiting sleeve 5 in a ball connection manner, the movable end is hinged with the second sliding block 16, the whole second sliding block 16 is in a T-shaped structure, the shape of the second limiting groove 15 is adapted to the second sliding block 16, the second sliding block 16 can always slide in the second limiting groove 15, the second sliding block 16 slides in the second limiting groove 15, and the limiting sleeve 5 can be rotated in a vertical plane by a certain angle, so that the anchoring machine 4 can be driven to rotate and adjust relative to the bracket.

Further, when the limit sleeve 5 rotates in the vertical direction relative to the bottom plate 1, the bottom of the anchoring machine 4 slides relative to the base, so that the arc-shaped base 7 is fixed at the bottom of the bottom plate 1, the extending direction of the arc-shaped base 7 corresponds to one of the support rods 2, the support rods 2 are connected with the telescopic rods 14, the first sliding block 10 is slidably arranged in the arc-shaped base 7, the top of the first sliding block 10 is integrally connected with the cylinder seat 11, the cylinder seat 11 is matched with the diameter of the bottom of the anchoring machine 4, the anchoring machine 4 is finally located in the cylinder seat 11 after being inserted from the limit sleeve 5, when the anchoring machine 4 needs to support on an inclined roadway, a person firstly adjusts the orientation of the whole support rod, so that the support rod 2 connected with the telescopic rod 14 faces the right ahead of the roadway, then pushes the support rod to the inclined roadway, when the support rod slides on the roadway, the anchoring machine 4 swings relative to the support rod under the action of gravity, at the moment, the second sliding block 16 slides downwards in the second limit groove 15, and the first sliding block 10 rotates in the bottom 7, and finally the anchoring machine 4 rotates in the vertical direction in the arc-shaped base 7, so that all vertical supporting states can be avoided, and all the vertical supporting states can be ensured.

When the bracket is on an inclined roadway, although the truckles 8 with the brake device can enable the whole bracket to stay on the roadway, in the actual operation process, the stability of the whole bracket cannot be guaranteed, because the whole device only has three truckles 8 to be in contact with the roadway, the contact area is small, so that the friction force between the bracket and the roadway is reduced, and in order to ensure the stability of the bracket during supporting operation, the truckles 8 can be folded, when the anchoring machine 4 needs to be transported, the truckles 8 are supported on the ground to participate in transportation, but when the anchoring machine 4 carries out supporting operation, the three truckles 8 are all folded, and the bottom of the bottom plate 1 is all in contact with the ground.

Specifically, a receiving groove 21 is formed at a position of the side portion of the base plate 1 corresponding to each caster 8, a fixed shaft 20 is fixedly connected to the top of each caster 8 in the vertical direction, a rotating shaft 26 is fixedly connected to the position of the fixed shaft 20 near the top thereof in the direction perpendicular to the axial direction thereof, and the fixed shaft 20 is rotatably installed in the receiving groove 21 through the rotating shaft 26. The rotary table 17 is rotatably arranged at the center of the inside of the bottom plate 1, three protrusions 27 are uniformly and annularly distributed on the circumferential surface of the rotary table 17, the three protrusions 27 and the rotary table 17 are integrally formed to form a special-shaped cam, a guide groove 23 is formed on the outer side surface of the special-shaped cam, each fixed shaft 20 and the rotary table 17 are connected through a push-pull rod 22, a third limit groove 25 is formed on the circumferential surface of the fixed shaft 20 on one side of the fixed shaft 20 facing the rotary table 17, the third limit groove 25 is axially distributed along the fixed shaft 20, one end of the fixed shaft 20 extends to the inside of the third limit groove 25 to be connected with the third limit groove in a sliding fit manner, the other end of the push-pull rod 22 penetrates through the bottom plate 1 to extend to the inside of the bottom plate, a sliding column 24 is fixedly connected with the sliding column 24, and the sliding column 24 is arranged in the guide groove 23 to be connected with the sliding column. It should be noted that, the guide groove 23 is integrally in a T-shaped structure, the height of the inner side is the same as that of the sliding column 24, and the height of the outer side is the same as that of the push-pull rod 22, so that the sliding column 24 can not slide out of the guide groove 23, and similarly, the inside of the third limit groove 25 is also in a T-shaped structure, so that the push-pull rod 22 always slides in the inside of the third limit groove 25, and further the push-pull rod 22 can push and pull the caster 8.

When the castor 8 contacts with the ground, the fixed shaft 20 is in a vertical state, at this time, one end of the push-pull rod 22 is located at the top of the third limit groove 25, the slide column 24 is located at the position where the turntable 17 is connected with the boss 27 in the guide groove 23, when the castor 8 needs to be folded, the turntable 17 is driven to rotate clockwise or anticlockwise by external force, at this time, the slide column 24 starts to slide in the guide groove 23 on the boss 27, the push-pull rod 22 pushes the fixed shaft 20 under the action of the boss 27, so that the fixed shaft 20 rotates towards the outer side of the base plate 1 by taking the rotating shaft 26 as the center, and during the process that the push-pull rod 22 acts on the fixed shaft 20, the push-pull rod also slides downwards relative to the third limit groove 25, finally, the castor 8 is separated from the ground, the base plate 1 contacts with the ground, and when the slide column 24 slides to the outermost side of the boss 27, the turntable 17 stops rotating, at this time, the fixed shaft 20 can rotate from a vertical state to a horizontal state. When the casters 8 are required to be reset, a person reversely rotates the turntable 17, and the three casters 8 are in contact with the ground and form a support for the base plate 1, so that the base plate 1 slowly rises upwards, and finally the fixed shaft 20 is in a vertical state.

The top of the turntable 17 is fixedly connected with a stand column 18 along the vertical direction, the stand column 18 extends upwards to penetrate through the bottom plate 1 and then is fixedly provided with a stop plate, the upper end surface of the bottom plate 1 is provided with a first limit groove 13 which is matched with the rotation track of the stand column 18, when the turntable 17 rotates in the bottom plate 1, the stand column 18 slides in the first limit groove 13, the power device for driving the stand column 18 to rotate is not limited, as long as the stand column 18 can be driven to rotate and the stand column 18 can be ensured to be fixed at two ends of the first limit groove 13, in the embodiment, a hydraulic cylinder 12 is adopted, the movable end of the hydraulic cylinder 12 is fixedly connected with a connecting sleeve 19, the connecting sleeve 19 is sleeved on the stand column 18, the fixed end of the hydraulic cylinder 12 is hinged on a lining seat, and the lining seat is rotatably arranged at the top of the bottom plate 1.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. The utility model provides a support for hydraulic jumbolter which characterized in that: the drilling machine comprises a triangular bottom plate (1) and a triangular top plate (3), wherein the bottom plate (1) and the top plate (3) are distributed in parallel in the vertical direction, the top plate (3) and the bottom plate (1) are fixedly connected through three uniformly distributed support rods (2), a through hole for a drilling machine to insert is formed in the center of the top plate (3), and the diameter of the through hole is larger than that of the drilling machine;

A limiting sleeve (5) concentric with the top plate (3) is arranged between the bottom plate (1) and the top plate (3), the inner diameter of the limiting sleeve (5) is matched with the diameter of the outer wall of the drilling machine, and the circumferential surface of the limiting sleeve (5) is connected with the three supporting rods (2);

The bottom of bottom plate (1) is fixed with arc base (7), and the inside slidable mounting of arc base (7) has first slider (10), and the top integrated into one piece of first slider (10) is connected with drum seat (11), and when drum seat (11) are arranged in and limit sleeve (5) are fixed to roof-bolter (4) bottom, under the action of gravity, roof-bolter (4), first slider (10) and limit sleeve (5) three can remain in vertical state throughout for bottom plate (1).

2. A stand for a hydraulic jumbolter according to claim 1, characterized in that: the limit sleeve (5) is respectively connected with the three support rods (2) through two connecting rods (6) with the same specification and a telescopic rod (14);

one end of each connecting rod (6) is fixedly connected with the supporting rod (2), and the other end is connected with the circumferential surface of the limiting sleeve (5) in a ball joint manner;

The inner side of the supporting rod (2) corresponding to the telescopic rod (14) is provided with a second limit groove (15) along the length direction of the supporting rod, a second sliding block (16) is slidably arranged in the second limit groove (15), the fixed end of the telescopic rod (14) is connected with the circumferential surface of the limit sleeve (5) in a ball joint mode, the movable end of the telescopic rod is hinged with the second sliding block (16), the second sliding block (16) is of a T-shaped structure as a whole, and the shape of the second limit groove (15) is matched with the second sliding block.

3. A stand for a hydraulic jumbolter according to claim 2, characterized in that: the extending direction of the arc-shaped base (7) corresponds to one of the supporting rods (2), and the supporting rods (2) are connected with the telescopic rods (14);

The inside slidable mounting of arc base (7) has first slider (10), and the top integrated into one piece of first slider (10) is connected with barrel seat (11), and the diameter looks adaptation of this barrel seat (11) and roof bolter (4) bottom.

4. A stand for a hydraulic jumbolter according to any one of claims 1 to 3, wherein: the bottom of the bottom plate (1) is also annularly provided with three casters (8).

5. A stand for a hydraulic jumbolter as recited in claim 4, wherein: the side part of the bottom plate (1) is provided with a storage groove (21) corresponding to the position of each caster wheel (8), the top of each caster wheel (8) is fixedly connected with a fixed shaft (20) along the vertical direction, the position of the fixed shaft (20) close to the top of the fixed shaft is fixedly connected with a rotating shaft (26) along the direction vertical to the axial direction, and the fixed shaft (20) is rotatably arranged in the storage groove (21) through the rotating shaft (26).

6. A stand for a hydraulic jumbolter as recited in claim 5, wherein: the rotary table (17) is rotatably arranged at the inner center of the bottom plate (1), three bulges (27) are uniformly distributed on the circumferential surface of the rotary table (17), the three bulges (27) and the rotary table (17) are integrally formed into a special-shaped cam, and a whole circle of guide groove (23) is formed on the outer side surface of the special-shaped cam;

Each fixed shaft (20) is connected with the rotary table (17) through a push-pull rod (22), wherein a third limit groove (25) is formed on the circumferential surface of one side of the fixed shaft (20) facing the rotary table (17), the third limit groove (25) is distributed along the axial direction of the fixed shaft (20), one end of the fixed shaft (20) extends to the inside of the third limit groove (25) to be connected with the inside in a sliding fit manner, the other end of the push-pull rod (22) penetrates through the bottom plate (1) to extend to the inside of the bottom plate, and then a sliding column (24) is fixedly connected with the other end of the push-pull rod, and the sliding column (24) is arranged in the guide groove (23) to be connected with the inside in a sliding manner;

The guide groove (23) is of a T-shaped structure, the height of the inner side of the guide groove is the same as that of the sliding column (24), the height of the outer side of the guide groove is the same as that of the push-pull rod (22), and the inner side of the third limit groove (25) is of a T-shaped structure, so that the push-pull rod (22) always slides in the third limit groove (25).

7. The stand for a hydraulic jumbolter of claim 6, wherein: the top of carousel (17) is along vertical direction fixedly connected with stand (18), stand (18) upwards extends and runs through the bottom plate (1) outside, the up end of bottom plate (1) is formed with first spacing groove (13) with stand (18) rotation orbit looks adaptation, bottom plate (1) top is provided with pneumatic cylinder (12), adapter sleeve (19) that the expansion end of pneumatic cylinder (12) is connected cup joints on stand (18), the stiff end of pneumatic cylinder (12) articulates on the base, the base then rotates and installs at bottom plate (1) top.

8. A stand for a hydraulic jumbolter as recited in claim 7, wherein: the fixed shaft (20) is in a vertical state, one end of the push-pull rod (22) is positioned at the top of the third limit groove (25), the sliding column (24) is positioned at the position where the rotary table (17) is connected with the bulge (27) in the guide groove (23), and when the sliding column (24) slides to the outermost side of the bulge (27), the fixed shaft (20) rotates from the vertical state to the horizontal state.