CN112110375B - Bogie unloading equipment - Google Patents

Abstract

The invention discloses a bogie unloading device for a straddle monorail train, which comprises: the upper surface of the base is provided with a bogie lifting device and two supporting beams; the bogie lifting device comprises a supporting beam and a lifting module, and the lifting module is used for driving the supporting beam to move up and down; the left end and the right end of the bogie lifting device are respectively provided with a supporting beam, and when the supporting beam is at a preset height, the upper surface, the front side surface and the rear side surface of each supporting beam are in smooth transition with the upper surface, the front side surface and the rear side surface of the supporting beam respectively; and the front side and the rear side of the supporting beam are both provided with a car lifting jack. Thereby providing a facility for facilitating the removal and installation of the bogie.

Description

Bogie unloading equipment

Technical Field

The invention relates to the technical field of rail transit, in particular to a bogie unloading device.

Background

The straddle-type monorail train is a train supported, stabilized and guided by a single track beam 1 ', a train body of the straddle-type monorail train usually runs by riding tires on the track beam 1', and the straddle-type monorail train has the advantages of strong adaptability, low noise, small turning radius and strong climbing capability. As shown in fig. 1, a bogie 2' is provided at the bottom of the vehicle body, and a plurality of tires, for example: running wheels 3 ', guide wheels 4 ', stabilizing wheels 5 ' and the like. Wherein the running wheels 3 ' are movable along the upper surface of the track beam 1 ' and the guide wheels 4 ' and the stabilizing wheels 5 ' are movable along the sides of the track beam 1 '.

During use of the straddle monorail train, the bogie 2 'and the tires need to be frequently maintained (for example, tire replacement, inflation and the like), in this case, the bogie 2' needs to be firstly unloaded from the bottom of the train body, then the bogie 2 'and the tires need to be maintained, and after the maintenance is completed, the bogie 2' needs to be installed on the bottom of the train body again. As shown in fig. 1, it is very troublesome to dismount (i.e., remove and mount) the bogie 2 ', and therefore, it is a problem to be solved to design an apparatus for facilitating the dismounting of the bogie 2' from the straddle-type monorail train.

Disclosure of Invention

In view of the above, the main object of the present invention is to provide a truck unloading apparatus.

In order to achieve the purpose, the technical scheme of the invention is realized as follows: a bogie unloading apparatus for a straddle monorail train comprising: the upper surface of the base is provided with a bogie lifting device and two supporting beams; the bogie lifting device comprises a supporting beam and a lifting module, and the lifting module is used for driving the supporting beam to move up and down; the left end and the right end of the bogie lifting device are respectively provided with a supporting beam, and when the supporting beam is at a preset height, the upper surface, the front side surface and the rear side surface of each supporting beam are in smooth transition with the upper surface, the front side surface and the rear side surface of the supporting beam respectively; and the front side and the rear side of the supporting beam are both provided with a car lifting jack.

As an improvement of the embodiment of the invention, concave holes are formed in the left end face and the right end face of each joist, and an expansion link is arranged on the end face, facing the joist, of each joist; when the joist is at the preset height, each telescopic rod can be inserted into the corresponding concave hole.

As an improvement of the embodiment of the invention, a number of pressure measuring devices are arranged on both the front and the rear side of the joist, each pressure measuring device being capable of abutting against a unique guide wheel or a unique stabilizing wheel.

As an improvement of the embodiments of the present invention, the lifting module is a scissor lift truck.

As an improvement of the embodiment of the present invention, a plurality of rails extending in the front-rear direction are disposed on the upper surface of the base, the rails are located below the lifting module, and a plurality of rollers capable of rolling along the rails are disposed on the lower surface of the lifting module.

As an improvement of the embodiment of the present invention, the lifting module further includes: the hydraulic cylinder is used for storing hydraulic oil and comprises an oil tank, a hydraulic pump, a one-way valve, a first valve device, a second valve device and a hydraulic oil cylinder; one port of the hydraulic pump is communicated with the oil tank, and the other port of the hydraulic pump is communicated with an inlet of the one-way valve; the inlet of the first valve device is communicated with the outlet of the one-way valve, the outlet of the first valve device is communicated with the oil tank, and the first valve device can allow or prohibit hydraulic oil to flow from the inlet to the outlet of the first valve device; the outlet of the one-way valve and the oil tank are communicated with a second valve device, the second valve device is communicated with the hydraulic oil cylinder, and the second valve device can allow or prohibit the hydraulic oil to flow through the hydraulic oil cylinder; the hydraulic oil cylinder can drive the joist to move up and down.

As a modification of the embodiment of the present invention, an oil filter is provided between the hydraulic pump and the oil tank.

As an improvement of the embodiment of the present invention, the lifting module further includes: and the three-phase asynchronous motor drives the hydraulic pump to work.

As a modification of the embodiment of the present invention, the first valve device includes: the oil tank comprises a pressure reducing valve and an electromagnetic one-way valve, wherein one port of the pressure reducing valve is communicated with an outlet of the one-way valve, the other port of the pressure reducing valve is communicated with one port of the electromagnetic one-way valve, and the other port of the electromagnetic one-way valve is communicated with the oil tank.

As an improvement of the embodiment of the invention, the second valve device includes: the electromagnetic two-way valve, the hydraulic control one-way valve and the two one-way throttle valves; the outlet of the one-way valve and the oil tank are communicated with an electromagnetic two-way valve, the electromagnetic two-way valve is communicated with the hydraulic control one-way valve, the hydraulic control one-way valve is respectively communicated with two ports of the hydraulic oil cylinder through two pipelines, and a one-way throttle valve is arranged in each pipeline.

The bogie unloading equipment provided by the embodiment of the invention has the following advantages: the embodiment of the invention discloses bogie unloading equipment for a straddle monorail train, which comprises: the upper surface of the base is provided with a bogie lifting device and two supporting beams; the bogie lifting device comprises a supporting beam and a lifting module, and the lifting module is used for driving the supporting beam to move up and down; the left end and the right end of the bogie lifting device are respectively provided with a supporting beam, and when the supporting beam is at a preset height, the upper surface, the front side surface and the rear side surface of each supporting beam are in smooth transition with the upper surface, the front side surface and the rear side surface of the supporting beam respectively; and the front side and the rear side of the supporting beam are both provided with a car lifting jack. Thereby providing a facility for facilitating the removal and installation of the bogie.

Drawings

FIG. 1 is a schematic structural view of a bogie of a straddle monorail train in the prior art;

fig. 2A is a schematic structural view of the bogie unloading apparatus in this embodiment;

FIG. 2B is a schematic structural view of the support beam in this embodiment;

FIG. 3 is a schematic structural view of the joist in the present embodiment;

fig. 4A is a schematic structural diagram of the bottom chassis in the present embodiment;

FIG. 4B is a schematic structural diagram of the scissor arm assembly in the present embodiment;

fig. 5 is a circuit configuration diagram of a control circuit of the lifting module in the present embodiment;

fig. 6 is a schematic structural view of the telescopic rod in the present embodiment;

FIG. 7 is a circuit diagram showing a control circuit of the telescopic rod in this embodiment

Fig. 8 is a circuit diagram of the control circuit for preventing the erroneous operation in the present embodiment.

Detailed Description

The present invention will be described in detail below with reference to embodiments shown in the drawings. The present invention is not limited to the embodiment, and structural, methodological, or functional changes made by one of ordinary skill in the art according to the embodiment are included in the scope of the present invention.

The following description and the drawings sufficiently illustrate specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments herein includes the full ambit of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like, herein are used solely to distinguish one element from another without requiring or implying any actual such relationship or order between such elements. In fact, a first element could be termed a second element, and vice versa. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a structure, device or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein, as used herein, are defined as orientations or positional relationships based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "electrically connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, communication between two elements, direct connection, and indirect connection via an intermediary, where the specific meaning of the terms is understood by those skilled in the art as appropriate.

An embodiment of the present invention provides a bogie unloading apparatus for a straddle monorail train, as shown in fig. 2A and 2B, including:

the bogie lifting device comprises a base 3, wherein a bogie lifting device 1 and two supporting beams 2 are arranged on the upper surface of the base 3; the bogie lifting device 1 comprises a joist 11 and a lifting module 12, wherein the lifting module 12 is used for driving the joist 11 to move up and down; here, the lifting module 12 can drive the joist 11 to move up and down, and the lifting module 12 may be an electrically driven module or a mechanical module, for example, a hydraulically driven mechanical device.

The left end and the right end of the bogie lifting device 1 are respectively provided with a supporting beam 2, and when the joist 11 is at a preset height, the upper surface, the front side surface and the rear side surface of each supporting beam 2 are in smooth transition with the upper surface, the front side surface and the rear side surface of the joist 11 respectively; and the front side and the rear side of the supporting beam 2 are provided with car lifting jacks.

Here, since the upper surface of the support beam 2 and the upper surface of the joist 11 are smoothly transited, the running wheels can smoothly move between the two upper surfaces; meanwhile, the front side surface of the supporting beam 2 and the front side surface of the joist 11 are in smooth transition, so that the guide wheels and the stabilizing wheels can smoothly move between the two front side surfaces; at the same time, the rear side of the supporting beam 2 and the rear side of the joist 11 are in smooth transition, so that the guide wheels and the stabilizing wheels can move smoothly between the two rear sides. Optionally, the joist 11 and the supporting beams 2 are both of a cylindrical structure, and the cross sections (the cross sections are perpendicular to the left-right direction) are the same, that is, when the joist 11 is at a preset height, the joist 11 and the supporting beams 2 at two sides can seamlessly form a track beam.

Here, in practice, a maintenance base of the straddle monorail train is usually provided, in which a plurality of rail beams are provided, and at the time of maintenance, the straddle monorail train can be stopped on the rail beams and then maintained. Here, it is possible to cut off some parts of the rail beam and replace these cut off parts with the dismounting device.

Here, the ends of the two support beams 2, which are far away from the bogie lifting device 1, can be connected to the track beam, and the upper surface, the front side and the rear side of the ends are smoothly transited respectively; thus, the bogies and tires at the bottom of the straddle monorail train can smoothly pass through the joists 11 and the support beams 2, and when the straddle monorail train stops, each joists 11 corresponds to one bogie, the running wheels 3 ' in the bogies are positioned on the upper surfaces of the joists 11, and the guide wheels 4 ' and the stabilizing wheels 5 ' are positioned on the front and rear side surfaces of the joists 11. At the moment, the car lifting jack is required to be controlled to move upwards and abut against the side face of the straddle monorail train, then the connection between the bogie and the bottom of the train body is disconnected, the lifting module 12 is used for controlling the joist 11 to move downwards, and at the moment, the bogie and the tires can be maintained; it will be appreciated that, at this point, the lift truck will support the vehicle body; also, after the maintenance of the bogie and the tires has been completed, the bogie can be mounted to the bottom of the straddle monorail train in the reverse procedure.

Here, as shown in fig. 2A and 2B, two support columns 21 are fixedly provided on the lower surface of the support beam 2, the two support columns 21 are distributed in the left-right direction, and each support column 21 includes two support legs 211 distributed in the front-rear direction. As shown in fig. 2B, the cross section of the support beam 2 is "i" shaped, and it is understood that the cross section of the joist 11 is also "i" shaped, and the cross section of the track beam is also "i" shaped. Here, in actual use, there is a possibility that deformation may occur between the support beam 2 and the rail beam, and therefore, the finger plate 22 may be provided between the support beam 2 and the rail beam.

Alternatively, as shown in fig. 3, the joist 11 is a welded steel box structure. The support beam 2 may have a dimension of 1860mm in the left-right direction, a dimension of 979mm in the front-rear direction, and a dimension of 2120mm in the up-down direction. The joist 11 may have a dimension in the left-right direction of 2200mm, a dimension in the front-rear direction of 700mm and a dimension in the up-down direction of 1300 mm.

In this embodiment, the left and right end surfaces of the joist 11 are provided with concave holes 111, and the end surface of each supporting beam 2 facing the joist 11 is provided with a telescopic rod; when the joist 11 is at a predetermined height, each telescopic rod can be inserted into the corresponding recess 111. Here, it is understood that, in use, the bogie applies downward pressure to the joist 11, and the pressure is usually relatively large, and in addition, the joist 11 may be inclined forward or backward, so that the telescopic rod provided in the support beam 2 can be inserted into the concave hole 111, thereby effectively preventing the joist 11 from moving downward, inclining forward or backward.

In this embodiment, several pressure measuring devices 112 are arranged on both the front and the rear side of the joist 11, each pressure measuring device 112 being able to abut against a unique guide wheel or a unique stabilizing wheel. Here, a plurality of guide wheels and stabilizing wheels are provided on the bogie. The front side and the rear side of the track beam are provided with a plurality of tires (such as guide wheels, stabilizing wheels and the like), the tires on the front side are generally arranged opposite to the tires on the rear side one by one, in addition, the tires on the front side have pressure F1 (the pressure F1 can be obtained by a pressure measuring device 112 which is arranged on the front side and abutted against the tires), and the tires on the rear side also have pressure F2 (the pressure F2 can be obtained by a pressure measuring device 112 which is arranged on the rear side and abutted against the tires); furthermore, under normal circumstances, the bogie should be centered at the bottom of the vehicle body, resulting in a | F1-F2| ≦ threshold; conversely, if | F1-F2| is > threshold, it indicates that the truck is not in a central position and requires adjustment. Here, as shown in fig. 3, two guide wheels and one stabilizing wheel are provided on both front and rear sides of the joist 11, and thus, three pressure measuring devices 112 are provided on both front and rear sides of the joist 11. In addition, a plurality of through holes penetrating the joist 11 may be provided in the front-rear direction, and the pressure measuring devices 112 may be installed in the through holes.

In this embodiment, the lifting module 12 is a scissor lift truck. Here, as shown in fig. 4A and 4B, the scissor lift truck includes: the scissors assembly comprises an underframe 121, a plurality of oppositely arranged scissor arm sets 122 arranged between the underframe 121 and a joist 11, and a driving device (such as a hydraulic oil cylinder and the like) for driving the scissor arm sets 122 to perform opening and closing movements, wherein each scissor arm set 122 comprises two scissor arms 1221 which are mutually hinged into an X shape; furthermore, the top of the scissor-arm set 122 has two ends, a first end hinged to the bottom of the joist 11 and a second end slidably connected to the bottom of the joist 11; the bottom of the scissor arm set 122 has two ends, a first end hinged to the base frame 121 of the joist 11 and a second end slidably connected to the bottom of the base frame 121. Wherein the first end and the second end are opposite ends. Optionally, the number of the scissor arm sets 122 is two.

Here, as shown in fig. 4A, the chassis 121 is a single frame body surrounded by two first beams 1211 extending in the front-rear direction and two second beams 1215 extending in the left-right direction. Two hinges 1212 are provided on the inner side surface of the right first beam 1211, a first end of the bottom of the scissor-arm set 122 is hinged to the hinges 1212, a slide rail 1214 extending in the left-right direction is provided in the middle of the frame, and a second end of the bottom of the scissor-arm set 122 is slidably connected to the slide rail 1214 to form an underframe. In addition, two limiting columns 1213 are provided on the upper surfaces of the first and second beams 1211, and the joist 11 can be finally positioned between the two limiting columns 1213 when the joist 11 moves downward, so that the joist 11 can be effectively prevented from tilting forward or backward, and the connection between the different parts of the base frame 121 can be welded. Optionally, the base frame 121 is made of steel, and in order to improve the stability of the spacing column 1213, a reinforcing rib is provided between the spacing column 1213 and the upper surfaces of the first and second beams.

Here, the driving device may be a hydraulic cylinder 513, especially a swing hydraulic cylinder, and specifically may be a CA swing type hydraulic cylinder, the cylinder diameter is phi 150, the joint phi 150, the mechanism adopts 1 single-stage hydraulic cylinder, and the connection of the cylinder with the foundation and the platform all adopts a universal seat to ensure that the cylinder does not bear bending force. The main overall dimension of the shear support is 1683mm long, and the maximum lifting travel distance is 1020 mm.

In this embodiment, a plurality of rails extending in the front-rear direction are disposed on the upper surface of the base 3, the rails are located below the lifting module 12, and a plurality of rollers capable of rolling along the rails are disposed on the lower surface of the lifting module 12. Here, when the joist 11 holds the bogie, the lifting module 12 is controlled to move downwards, so that the joist 11 also moves downwards, and when the joist 11 is lowered to a sufficient height, the lifting module 12 can be controlled to slide along the rail, so that the joist 11 and the bogie can be moved to the front or the rear of the joist 11, thereby facilitating the maintenance of the bogie and/or the tire by the worker. Here, the rail may be fixedly mounted to the base 3 using embedded bolts. Optionally, the roller is disposed at the bottom of the bottom frame 121. Optionally, the roller may be a DRS160 road wheel.

In this embodiment, the lifting module 12 further includes: an oil tank 501 for storing hydraulic oil, a hydraulic pump 503, a one-way valve 505, a first valve device, a second valve device and a hydraulic oil cylinder 513; one port of the hydraulic pump 503 is communicated with the oil tank 501, and the other port is communicated with an inlet of the check valve 505; here, when the hydraulic pump 503 is operated, it is possible to suck hydraulic oil from the oil tank 501 and then output the hydraulic oil to the check valve 505, and it is understood that hydraulic oil can flow only from the inlet of the check valve 505 and then flow out from the outlet of the check valve 505.

The inlet of the first valve means communicates with the outlet of the non-return valve 505 and the outlet of the first valve means communicates with said tank 501, the first valve means being capable of allowing or prohibiting the flow of hydraulic oil from its inlet to its outlet; the outlet of the one-way valve 505 and the oil tank 501 are both in communication with a second valve arrangement which is in communication with the hydraulic ram 513 and which is capable of allowing or disallowing hydraulic oil to flow through the hydraulic ram 513; the hydraulic oil cylinder 513 can drive the joist 11 to move up and down. Here, when the hydraulic pump 503 is operated, if the first valve device allows hydraulic oil to flow from its inlet to its outlet, and hydraulic oil does not flow through the second valve device, the joist 11 is moved downward. Conversely, if the first valve arrangement inhibits the flow of hydraulic oil from its inlet to its outlet and the second valve arrangement allows hydraulic oil to flow through hydraulic rams 513, hydraulic oil will flow to hydraulic rams 513 and the joist 11 will be raised.

In this embodiment, an oil filter 502 is provided between the hydraulic pump 503 and the oil tank 501.

In this embodiment, the lifting module 12 further includes: and a three-phase asynchronous motor 504 for driving the hydraulic pump 503 to work.

In this embodiment, the first valve device includes: a pressure reducing valve 508 and an electromagnetic check valve 509, wherein one port of the pressure reducing valve 508 is communicated with the outlet of the check valve 505, the other port is communicated with one port of the electromagnetic check valve 509, and the other port of the electromagnetic check valve 509 is communicated with the oil tank 501.

In this embodiment, the second valve device includes: an electromagnetic two-way valve 510, a pilot operated one-way valve 511 and two one-way throttle valves 512;

the outlet of the check valve 505 and the oil tank 501 are both communicated with an electromagnetic two-way valve 510, the electromagnetic two-way valve 510 is communicated with a hydraulic control one-way valve 511, the hydraulic control one-way valve 511 is respectively communicated with two ports of a hydraulic oil cylinder 513 through two pipelines, and a one-way throttle valve 512 is arranged in each pipeline.

Here, fig. 5 shows the circuit structure of the control circuit in the lifting module 12, and it can be seen that when the button SB1 is pressed, the coil KM1 is powered, the main contact of the coil KM1 is closed, the three-phase asynchronous motor 504 is powered to rotate, the electromagnetic two-way valve 510 obtains electric energy (allows hydraulic oil to flow), the electromagnetic one-way valve 509 does not obtain electric energy (does not allow hydraulic oil to flow), and the joist 11 is lifted; when the button SB2 is pressed, the coil KM2 is energized, the main contact of the coil KM2 is closed, the electromagnetic check valve 509 is energized (allowing hydraulic oil to flow), the electromagnetic check valve 510 is not energized (not allowing hydraulic oil to flow), and the joist 11 is lowered.

Here, as shown in fig. 6, a schematic structural diagram of the telescopic rod is shown, including: a three-phase asynchronous motor 211 which can drive the push rod 212 to move when rotating; when the three-phase asynchronous motor 211 rotates along the first direction, the push rod 212 can be driven to realize the pushing action, and the connecting rod 213 is driven to move synchronously, and the stop block 214 is relatively static and does not move; when the stopper 214 collides with the extension limit switch 216, the three-phase asynchronous motor 211 stops rotating, and the push rod 212 stops the push-out action, at which time the push rod 212 extends to the maximum limit length. When the three-phase asynchronous motor 211 rotates along the second rotation direction (the first rotation direction is opposite to the second rotation direction), the push rod 212 can be driven to realize the contraction action, when the stop block 214 collides with the contraction limit switch 215, the three-phase asynchronous motor 211 stops rotating, the push rod 212 stops the contraction action, and the push rod contracts to the maximum limit length.

Here, fig. 7 shows a control circuit of the telescopic rod, when a button SB3 is pressed, a coil KM3 is energized, a main contact of the coil KM3 is closed, a three-phase motor M2 and a three-phase motor M3 (the two three-phase motors each control one telescopic rod) are energized to rotate (rotate in a first direction), a maximum limit switch (normally closed switch) FC11 and a maximum limit switch (normally closed switch) FC21, which extend two push rods, are energized, when FC11 and FC21 are opened, the push rods reach a maximum range, the coil KM3 is disconnected from the main contact, and the motor M2 and the motor M3 stop rotating. When the button SB4 is pressed, the coil KM4 is energized, the main contact of the coil KM4 is closed, the three-phase motor M2 and the three-phase motor M3 are energized to rotate (rotate in the second direction, and the directions of the first and second directions are opposite), the maximum limit switch (normally closed switch) FC12 and the maximum limit switch (normally closed switch) FC22, in which the two push rods contract, are energized, when the FC12 and FC22 are disconnected, that is, the push rods reach the maximum range, the coil KM4 is disconnected from the main contact, and the motor M2 and the motor M3 stop rotating.

In the circuit shown in fig. 8, the on/off of the main circuit motor is mainly controlled by the circuit breaker Q1 and the circuit breaker Q2. When button SB1 is pressed, normally closed contact KM1 of button SB2 loop is opened, and when button SB2 is pressed, breaker Q1 is opened, so that power can not be supplied to motor and solenoid valve 2; similarly, when button SB3 is pressed, normally closed contact KM3 of the circuit of button SB4 is opened, and at this time, when button SB4 is pressed, breaker Q2 is opened, so that power is not supplied to the motor and the limit switch.

In the circuits shown in fig. 7 and 8, a thermal relay FR1 and a thermal relay FR2 are further included. It will be appreciated that the thermal relay is primarily used to overload protect the motor.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (8)

1. A bogie unloading apparatus for a straddle-type monorail train, comprising:

the bogie lifting device comprises a base (3), wherein a bogie lifting device (1) and two supporting beams (2) are arranged on the upper surface of the base (3);

the bogie lifting device (1) comprises a joist (11) and a lifting module (12), wherein the lifting module (12) is used for driving the joist (11) to move up and down; the lifting module (12) further comprises: the hydraulic control system comprises an oil tank (501) for storing hydraulic oil, a hydraulic pump (503), a one-way valve (505), a first valve device, a second valve device and a hydraulic oil cylinder (513); one port of the hydraulic pump (503) is communicated with the oil tank (501), and the other port is communicated with an inlet of the one-way valve (505); the inlet of the first valve device is communicated with the outlet of the one-way valve (505), the outlet of the first valve device is communicated with the oil tank (501), and the first valve device can allow or prohibit hydraulic oil to flow from the inlet to the outlet; the outlet of the one-way valve (505) and the oil tank (501) are both in communication with a second valve arrangement, the second valve arrangement being in communication with the hydraulic ram (513), the second valve arrangement being capable of allowing or disallowing hydraulic oil to flow through the hydraulic ram (513); the hydraulic oil cylinder (513) can drive the joist (11) to move up and down;

the left end and the right end of the bogie lifting device (1) are respectively provided with a supporting beam (2), and when the supporting beam (11) is at a preset height, the upper surface, the front side surface and the rear side surface of each supporting beam (2) are in smooth transition with the upper surface, the front side surface and the rear side surface of the supporting beam (11) respectively;

the front side and the rear side of the supporting beam (2) are provided with a car lifting jack.

2. The truck unloading apparatus of claim 1, wherein:

concave holes (111) are formed in the left end face and the right end face of the joist (11), and an expansion link is arranged on the end face, facing the joist (11), of each supporting beam (2);

when the joist (11) is at a preset height, each telescopic rod can be inserted into the corresponding concave hole (111).

3. The truck unloading apparatus of claim 1, wherein:

a plurality of pressure measuring devices (112) are arranged on the front side and the rear side of the joist (11), and each pressure measuring device (112) can abut against a unique guide wheel or a unique stabilizing wheel.

4. The truck unloading apparatus of claim 1, wherein:

the upper surface of base (3) is provided with a plurality of tracks that extend along the fore-and-aft direction, the track is located the below of lift module (12) the lower surface of lift module (12) is provided with a plurality of can along the rolling gyro wheel of track.

5. The truck unloading apparatus of claim 1, wherein:

an oil filter (502) is provided between the hydraulic pump (503) and the oil tank (501).

6. The bogie unloading apparatus of claim 1, wherein the lifting module (12) further comprises:

and a three-phase asynchronous motor (504) for driving the hydraulic pump (503) to work.

7. The truck unloader of claim 1, wherein the first valve apparatus comprises:

the oil tank comprises a pressure reducing valve (508) and an electromagnetic one-way valve (509), wherein one port of the pressure reducing valve (508) is communicated with an outlet of the one-way valve (505), the other port of the pressure reducing valve is communicated with one port of the electromagnetic one-way valve (509), and the other port of the electromagnetic one-way valve (509) is communicated with the oil tank (501).

8. The truck unloading apparatus of claim 1, wherein the second valve arrangement comprises:

the electromagnetic double-way valve (510), the hydraulic control one-way valve (511) and the two one-way throttle valves (512);

the outlet of the one-way valve (505) and the oil tank (501) are communicated with an electromagnetic two-way valve (510), the electromagnetic two-way valve (510) is communicated with a hydraulic control one-way valve (511), the hydraulic control one-way valve (511) is respectively communicated with two ports of a hydraulic oil cylinder (513) through two pipelines, and a one-way throttle valve (512) is arranged in each pipeline.

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