CN217572829U - Motor train unit bottom part replacement auxiliary device - Google Patents

Abstract

The utility model provides a motor train unit bottom part replacement auxiliary device, which comprises a bottom layer frame, a longitudinal sliding layer frame, a transverse sliding layer frame and a rotary swinging layer frame; the bottom layer frame is supported on the wheel falling machine platform; the longitudinal sliding layer frame is connected to the bottom layer frame in a sliding mode along the extending direction of the track and is recessed downwards into the bottom layer frame; the transverse sliding layer frame is horizontally connected to the longitudinal sliding layer frame in a sliding mode along the direction vertical to the track, is recessed downwards into the longitudinal sliding layer frame, and the top end of the transverse sliding layer frame protrudes out of the bottom layer frame; the rotary swing moving shelf is horizontally and rotatably connected to the top end of the transverse sliding moving shelf, and a supporting beam or a supporting flat plate suitable for supporting the part to be replaced is arranged on the rotary swing moving shelf. The utility model provides an auxiliary device is changed to EMUs vehicle bottom part can be to waiting to trade the part and carry out horizontal and vertical position adjustment and angle fine setting to improve the operating efficiency, reduce the resource and occupy.

Description

Motor train unit bottom part replacement auxiliary device

Technical Field

The utility model belongs to the technical field of the instrument is transferred and repaiied to the EMUs, concretely relates to EMUs vehicle bottom part changes auxiliary device.

Background

In the adjusting and repairing stage of the motor train unit, the vehicle bottom part needs to be replaced when the vehicle bottom part has a fault, and particularly, the traction converter cooling unit with high fault rate is limited by space and part weight because the distance between the bottom part and the rail surface is only 235-275 mm and the weight is more than nine hundred kilograms, so that the common adjusting support cannot be adopted for auxiliary operation.

At present, the process of repairing and replacing the large vehicle bottom part is as follows (taking the replacement of a cooling unit of a traction converter as an example): firstly, a motor train unit is drawn above the first position of a wheel drop machine, a cooling unit of a traction converter needing to be replaced is aligned with the first position of the wheel drop machine, and then a tray is placed on a platform of the wheel drop machine below the cooling unit for supporting; after the mechanical connection and the electrical connection between the cooling unit and the train body of the motor train unit are removed, the wheel dropping machine is operated to descend and move to the second position; then, a forklift is adopted to take down the tray bearing the fault cooling unit, and a new cooling unit on the other tray is placed on the wheel dropping machine platform; then, after the wheel drop machine is moved to the position below the vehicle body installation position, the wheel drop machine is lifted up to install the cooling unit.

The drawback of current operation mode lies in, only can't guarantee to once only to fall the mount pad of turbine and the mounting hole of automobile body chassis boundary beam to adjust well completely with cooling unit's removal, need adjust cooling unit's position repeatedly, and because space and weight are limited, need move the turbine that falls to No. two positions when carrying out position control at every turn and adjust through fork truck, even among the actual operation process be experienced very abundant adjustment personnel also need adjust more than the cubic repeatedly more than can be with cooling unit's four mount pads all with automobile body chassis boundary beam mounting hole, then just can carry out mechanical and electrical connection on next step, therefore, the change process is wasted time and energy, low efficiency, and need occupy many operating personnel cooperation operations, the resource occupies manyly.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a motor train unit vehicle bottom part changes auxiliary device aims at solving current motor train unit vehicle bottom part and changes the problem that inefficiency, resource occupation volume are big.

In order to achieve the purpose, the utility model adopts the technical proposal that: the utility model provides a EMUs vehicle bottom part changes auxiliary device includes:

the bottom layer frame is used for being fixedly supported on the track or the wheel drop machine platform;

the longitudinal sliding layer frame is connected to the bottom layer frame in a sliding mode along the extending direction of the track and is sunken downwards in the bottom layer frame;

the transverse sliding layer frame is horizontally connected to the longitudinal sliding layer frame in a sliding mode along the direction vertical to the track, is downwards sunken in the longitudinal sliding layer frame, and the top end of the transverse sliding layer frame protrudes above the bottom layer frame;

the rotary swing moving shelf is horizontally and rotatably connected to the top end of the transverse sliding moving shelf, and a supporting beam or a supporting flat plate suitable for supporting the part to be replaced is arranged on the rotary swing moving shelf.

In a possible implementation mode, the top center of the transverse sliding layer frame is fixedly connected with a slewing bearing, and the rotary swinging layer frame is fixedly connected to the rotating end of the slewing bearing.

In some embodiments, the transverse sliding shelf is provided with a rotation driving assembly, and an output end of the rotation driving assembly is connected with the rotation swinging shelf and is used for driving the rotation swinging shelf to rotate.

Illustratively, the rotary drive assembly includes:

the first support is fixedly connected to the transverse sliding layer frame;

the second support is fixedly connected to the transverse sliding layer frame and is aligned with the first support;

the first rotating rod is rotatably connected with the first support, one end of the first rotating rod penetrates through the first support and extends towards the second support, the peripheral wall of the extending end is provided with external threads, and the other end of the first rotating rod penetrates through the rotary swing layer moving frame outwards and is provided with a first hand wheel;

one end of the spline shaft is provided with a first threaded hole suitable for being screwed and matched with the external thread, the other end of the spline shaft penetrates through the second support in a sliding mode along the axial direction of the first rotating rod, and the penetrating end of the spline shaft is hinged with a connecting rod;

and the connecting lug seat is fixedly connected to the side wall of the rotary swing layer moving frame and is hinged with the connecting rod.

For example, the side wall of the rotary swing moving rack is provided with a long hole which extends horizontally and is suitable for the first rotating rod to pass through.

In a possible implementation mode, one side of the longitudinal sliding layer frame is provided with a third support protruding out of the upper side of the bottom layer frame, the third support is rotatably connected with a second rotating rod extending along the sliding direction of the transverse sliding layer frame, the transverse sliding layer frame is fixedly connected with a fourth support, the fourth support is provided with a second threaded hole penetrating along the axial direction of the second rotating rod, wherein one end of the second rotating rod penetrates through the third support and is in screwed connection with the second threaded hole in a matched mode, and the other end of the second rotating rod extends to the outer side of the bottom layer frame and is provided with a second hand wheel.

In some embodiments, a first bearing seat is arranged on a side wall of the bottom layer frame facing the sliding direction of the longitudinal sliding layer frame, a third rotating rod extending along the sliding direction of the longitudinal sliding layer frame is rotatably connected to the first bearing seat, a threaded sleeve is fixedly connected to the longitudinal sliding layer frame along the axial direction of the third rotating rod, one end of the third rotating rod penetrates through the first bearing seat and is in screwed fit with the threaded sleeve, and a third hand wheel is arranged at the other end of the third rotating rod.

Illustratively, a second bearing seat is arranged on a side wall of the bottom frame opposite to the first bearing seat, a fourth rotating rod is rotatably connected to the second bearing seat, one end of the fourth rotating rod penetrates through the second bearing seat along the axial direction of the third rotating rod and is fixedly connected with the rotary joint end of the third rotating rod, and a fourth hand wheel is arranged at the other end of the fourth rotating rod.

In some embodiments, two groups of sliding block guide rail pairs are distributed between the transverse sliding layer frame and the longitudinal sliding layer frame and between the longitudinal sliding layer frame and the bottom layer frame at intervals.

For example, four corner positions of the bottom shelf are respectively provided with a supporting leg extending vertically and downwardly, and two lifting ear plates extending out of the outer side of the bottom shelf are distributed on two opposite side walls of the bottom shelf at intervals.

The utility model provides an auxiliary device is changed to EMUs vehicle bottom part's beneficial effect lies in: compared with the prior art, the utility model discloses motor train unit vehicle bottom part changes auxiliary device, through bottom frame fixed stay on the wheel machine platform or the track that falls that are located the motor train unit below, adopt vertical sliding layer frame to cave in the bottom frame, the mode of horizontal sliding layer frame sunken in vertical sliding frame, can reduce whole occupation high space, thereby can adapt to narrow and small space requirement between vehicle bottom part and the track, treat that the part bearing is placed on rotatory pendulum moving layer frame, the accessible is along the vertical sliding layer frame of track extending direction slip, perpendicular track direction slip horizontal sliding layer frame, rotate rotatory pendulum moving layer frame and will treat to trade the part and align completely with motor train unit automobile body mounted position, single can accomplish the operation, need not to remove the wheel machine that falls repeatedly, can directly treat the position and the angle of trading the part in the below of mounted position and carry out the pertinence adjustment, the adjustment process is simple laborsaving, can improve the operating efficiency and reduce occuping of manpower and material resources.

Drawings

Fig. 1 is a schematic perspective view of an auxiliary device for replacing underbody parts of a motor train unit provided by an embodiment of the invention;

fig. 2 is the embodiment of the utility model provides a EMUs vehicle bottom part changes auxiliary device's explosion structure schematic diagram.

In the figure: 10. a bottom shelf; 11. supporting legs; 12. hoisting the lug plate; 13. a slider guide rail pair; 20. a longitudinal sliding layer frame; 30. transversely sliding the shelf; 40. rotating the swing layer moving frame; 41. a support beam; 42. a strip hole; 50. a slewing bearing; 60. a rotary drive assembly; 61. a first support; 62. a second support; 63. a first rotating lever; 631. a first hand wheel; 64. a spline shaft; 641. a connecting rod; 65. connecting the ear seat; 71. a third support; 72. a second rotating lever; 721. a second hand wheel; 73. a fourth support; 81. a first bearing housing; 82. a third rotating rod; 821. a third hand wheel; 83. a threaded sleeve; 84. a second bearing housing; 85. a fourth rotating rod; 851. a fourth hand wheel; 90. a track.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 and fig. 2 together, the auxiliary device for replacing the bottom part of the motor train unit provided by the present invention will now be described. The motor train unit bottom part replacement auxiliary device comprises a bottom layer frame 10, a longitudinal sliding layer frame 20, a transverse sliding layer frame 30 and a rotary swing layer frame 40; wherein, the bottom layer frame 10 is used for being fixedly supported on the track 90 or the platform of the wheel falling machine; the longitudinal sliding shelf 20 is connected to the bottom shelf 10 in a sliding manner along the extending direction of the rail 90 and is recessed downwards inside the bottom shelf 10; the transverse sliding shelf 30 is horizontally connected to the longitudinal sliding shelf 20 in a sliding manner along the direction perpendicular to the rail 90, and is recessed downwards inside the longitudinal sliding shelf 20, and the top end of the transverse sliding shelf protrudes above the bottom shelf 10; the rotary swing moving shelf 40 is horizontally and rotatably connected to the top end of the transverse sliding moving shelf 30, and a supporting beam 41 or a supporting flat plate suitable for supporting the component to be replaced is arranged on the rotary swing moving shelf 40.

It should be noted that, in the present embodiment, each layer rack is of a frame structure, the size of the frame can be utilized to realize that the longitudinal sliding layer rack 20 can be recessed inside the bottom layer rack 10, and the transverse sliding layer rack 30 can be recessed inside the longitudinal sliding layer rack 20, so that the height of the whole device is close to the sum of the thicknesses of the bottom layer rack 10 and the rotary swinging layer rack 40, the height of the whole device is calculated according to the thickness of 60-80 mm, and the gap between the two layers (i.e. the size of the transverse sliding layer rack 30 protruding above the bottom layer rack 10) is about 20mm, so that the height of the whole device can be controlled within 180mm, and the vehicle bottom part is, for example, the traction converter cooling unit is 235-275 mm away from the rail 90, so that when the cooling unit is installed by using the device, the gap between the installation seat of the cooling unit and the vehicle bottom side beam installation position is about 50mm for observing the alignment state is kept, therefore, the device can be directly fixed and supported on the rail 90, that the cooling unit is placed on the rotary swinging layer rack 40 (the support plate or two support plates 41 spaced apart), and then the rail is completely aligned with the forklift 90, and the forklift through the longitudinal and the forklift, and then the cooling unit can be completely rotated and the forklift.

It should be noted that, for improving operation security and stability, the preferred mode that adopts the same with tray operation process of the EMUs vehicle bottom part replacement auxiliary device that this embodiment provided, difference between them mainly lies in the process of waiting to change the part and carrying out position and angle adjustment, other processes are the same, and concrete adjustment process is: when a part to be replaced is installed, after the wheel drop machine runs in place, the wheel drop machine rises to the position where the part to be replaced is located, the wheel drop machine stops when the distance between the part to be replaced and the installation position is about 50mm, then whether the part to be replaced is aligned with the installation position is observed, if the part to be replaced is not aligned with the installation position, the longitudinal position deviation (namely the extending direction of the track 90) can be adjusted through the sliding longitudinal sliding layer frame 20, the transverse position deviation can be adjusted through the sliding transverse sliding layer frame 30, the angle deviation can be adjusted through the rotating rotary swing layer frame 40, and after the part to be replaced is completely aligned with the installation position, the wheel drop machine continues to lift, so that the part to be replaced is abutted to the installation position and then is fixedly connected.

Compared with the prior art, the motor train unit bottom part replacement auxiliary device provided by the embodiment is fixedly supported on a wheel dropping platform or a rail 90 positioned below a motor train unit through the bottom frame 10, the mode that the longitudinal sliding layer frame 20 is sunken in the bottom frame 10 and the transverse sliding layer frame 30 is sunken in the longitudinal sliding layer frame is adopted, the overall height space occupied can be reduced, so that the narrow space requirement between the bottom part and the rail 90 can be met, a part to be replaced is supported and placed on the rotary swing layer frame 40, the position and the angle of the part to be replaced can be directly and pertinently adjusted below the installation position by sliding the longitudinal sliding layer frame 20 along the extension direction of the rail 90, sliding the transverse sliding layer frame 30 perpendicular to the direction of the rail 90 and rotating the rotary swing layer frame 40, the part to be replaced is completely aligned with the motor train unit body installation position, operation can be completed by one person without repeatedly moving the wheel dropping machine, the position and the angle of the part to be replaced can be directly adjusted, the adjustment process is simple and labor-saving, the operation efficiency can be improved, and the occupation of manpower and material resources can be reduced.

In some embodiments, referring to fig. 2, a pivoting support bearing 50 is fixedly connected to the top center of the lateral sliding layer shelf 30, and the rotating swing layer shelf 40 is fixedly connected to the rotating end of the pivoting support bearing 50. The rotary connection between the rotary swinging shelf 40 and the transverse sliding shelf 30 is realized through the slewing bearing 50, so that the rotary portability of the rotary swinging shelf 40 can be ensured, sufficient bearing capacity can be provided, and the structure is stable and reliable.

In order to facilitate the rotation operation and reduce the labor intensity, in this embodiment, please refer to fig. 1 and fig. 2, a rotation driving assembly 60 is disposed on the lateral sliding shelf 30, and an output end of the rotation driving assembly 60 is connected to the rotation swinging shelf 40 for driving the rotation swinging shelf 40 to rotate.

Specifically, as an embodiment of the above-mentioned rotary driving assembly 60, please refer to fig. 1 and fig. 2, the rotary driving assembly 60 includes a first seat 61, a second seat 62, a first rotating rod 63, a spline shaft 64, and a connecting lug 65; wherein, the first support 61 is fixedly connected to the transverse sliding shelf 30; the second support 62 is fixedly connected to the transverse sliding layer frame 30 and is aligned with the first support 61; the first rotating rod 63 is rotatably connected with the first support 61, one end of the first rotating rod penetrates through the first support 61 and extends towards the second support 62, the peripheral wall of the extending end is provided with external threads, and the other end of the first rotating rod penetrates through the rotary swing layer rack 40 outwards and is provided with a first hand wheel 631; one end of the spline shaft 64 is provided with a first threaded hole suitable for being screwed and matched with the external thread, and the other end of the spline shaft slides along the axial direction of the first rotating rod 63 and penetrates through the second support 62, and the penetrating end of the spline shaft is hinged with a connecting rod 641; the connecting ear seat 65 is fixedly connected to the sidewall of the rotary swing layer frame 40 and is hinged to the connecting rod 641.

When needing the adjustment to wait to trade the angle of part, only need stir first hand wheel 631, can slide in second support 62 through the cooperation relation drive integral key shaft 64 of external screw thread and first screw hole, integral key shaft 64 promotes or stimulates connecting rod 641, thereby promote or stimulate engaging lug 65, and then drive rotatory layer frame 40 that moves and carry out forward or antiport, moreover, the steam generator is simple in structure, can enough conveniently carry out angular adjustment, also can improve the angular adjustment precision, can also make rotatory layer frame 40 that moves keep set angle, avoid it to take place free rotation and influence the installation.

In this embodiment, the side wall of the rotary swing stage frame 40 is provided with a horizontally extending elongated hole 42 suitable for the first rotating rod 63 to pass through. When the rotary swing shelf 40 rotates, the side wall of the rotary swing shelf and the first rotating rod 63 deviate from each other, the first rotating rod 63 can be prevented from interfering the rotation of the rotary swing shelf 40 by the strip hole 42, and of course, the large angle deviation and dislocation can not occur in the actual operation, so that the rotary swing shelf 40 only needs to rotate the rotation freedom degree with a certain angle range, and the length of the strip hole 42 only needs to be matched with the rotation angle range required by the rotary swing shelf 40.

In order to facilitate the adjustment of the transverse position and reduce the labor intensity, in some embodiments, please refer to fig. 1 and fig. 2, a third support 71 protruding above the bottom rack 10 is disposed on one side of the longitudinal sliding rack 20, a second rotating rod 72 extending along the sliding direction of the transverse sliding rack 30 is rotatably connected to the third support 71, a fourth support 73 is fixedly connected to the transverse sliding rack 30, the fourth support 73 has a second threaded hole penetrating along the axial direction of the second rotating rod 72, wherein one end of the second rotating rod 72 penetrates through the third support 71 and is in screwed fit with the second threaded hole, and the other end extends to the outside of the bottom rack 10 and is provided with a second hand wheel 721.

When the horizontal position adjustment needs to be carried out, only the second hand wheel 721 needs to be shifted to drive the second rotating rod 72 to rotate, the fourth support 73 can be pushed or pulled by utilizing the thread matching relation of the second rotating rod 72 and the second threaded hole, so that the horizontal sliding layer frame 30 is pushed or pulled to slide, the structure is simple and stable, the horizontal position adjustment can be conveniently carried out, the adjustment accuracy can be improved, the horizontal sliding layer frame 30 can be kept at the set position, and the installation operation is prevented from being influenced by the free sliding of the horizontal sliding layer frame 30.

Further, for convenience of operation, in the present embodiment, the first hand wheel 631 and the second hand wheel 721 are located on the same side of the undercarriage 10.

In order to facilitate the adjustment of the longitudinal position and reduce the labor intensity, in some embodiments, please refer to fig. 1 and fig. 2, a first bearing seat 81 is disposed on a side wall of the bottom layer frame 10 facing the sliding direction of the longitudinal sliding layer frame 20, a third rotating rod 82 extending along the sliding direction of the longitudinal sliding layer frame 20 is rotatably connected to the first bearing seat 81, a threaded sleeve 83 is fixedly connected to the longitudinal sliding layer frame 20 along an axial direction of the third rotating rod 82, wherein one end of the third rotating rod 82 passes through the first bearing seat 81 and is screwed and matched with the threaded sleeve 83, and the other end is provided with a third hand wheel 821.

When the longitudinal position adjustment is needed, only the third hand wheel 821 needs to be shifted to drive the third rotating rod 82 to rotate, the third rotating rod 82 and the screw sleeve 83 can be utilized to be matched with each other through threads, so that the screw sleeve 83 is pushed or pulled, the longitudinal sliding layer frame 20 is pushed or pulled to slide, the structure is simple and stable, the longitudinal position adjustment can be conveniently carried out, the adjustment accuracy can be improved, the longitudinal sliding layer frame 20 can be kept at a set position, and the installation operation is prevented from being influenced due to free sliding.

For example, in the present embodiment, a second bearing seat 84 is disposed on a side wall of the sub-frame 10 opposite to the first bearing seat 81, a fourth rotating rod 85 is rotatably connected to the second bearing seat 84, one end of the fourth rotating rod 85 penetrates through the second bearing seat 84 along an axial direction of the third rotating rod 82 and is fixedly connected to a rotating end of the third rotating rod 82, and a fourth handwheel 851 is disposed at the other end of the fourth rotating rod 85.

When the longitudinal position adjustment needs to be carried out, the fourth hand wheel 851 is shifted to drive the third rotating rod 82 to rotate through the fourth rotating rod 85, so that the longitudinal sliding layer frame 20 is driven to slide, the longitudinal position adjustment can be carried out on both sides of an operator, and the operation is convenient and flexible.

It should be noted that, in some possible implementation manners, referring to fig. 1 and fig. 2, two sets of sliding block guide rail pairs 13 are distributed at intervals between the transverse sliding shelf 30 and the longitudinal sliding shelf 20, and between the longitudinal sliding shelf 20 and the bottom shelf 10. The sliding block guide rail pair 13 is a common kinematic pair for realizing sliding connection of the component parts, and specifically, two guide rails extending along the direction of the rail 90 are arranged at intervals on the bottom layer frame 10, and two sliding blocks are fixed at intervals on two sides of the longitudinal sliding layer frame 20 respectively to realize sliding connection of the longitudinal sliding layer frame 20 and the bottom layer frame 10; meanwhile, two guide rails perpendicular to the direction of the rail 90 are arranged on the longitudinal sliding layer frame 20 at intervals, two sliding blocks are fixed on two sides of the transverse sliding layer frame 30 at intervals respectively, sliding connection between the transverse sliding layer frame 30 and the longitudinal sliding layer frame 20 is achieved, the connection mode is simple and reliable, and sliding is light and stable.

It should be understood that, in the present embodiment, referring to fig. 1, four corner positions of the bottom layer frame 10 are respectively provided with support legs 11 extending vertically and downwardly, and two lifting ear plates 12 extending outside the bottom layer frame 10 are distributed on two opposite side walls of the bottom layer frame 10 at intervals. When the wheel machine platform that falls can make through setting up supporting leg 11 and rise to limit height (with ground parallel and level), a supporting beam 41 or the supporting plate of rotatory pendulum moving layer frame 40 can be higher than track 90 top surfaces to the messenger waits to trade the part and can be connected fixedly with the mounted position contact, sets up hoist and mount otic placode 12 and can conveniently hoist it and transport, and the practicality is strong.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. EMUs vehicle bottom part changes auxiliary device, its characterized in that includes:

the bottom layer frame is used for being fixedly supported on the track or the wheel dropping machine platform;

the longitudinal sliding layer frame is connected to the bottom layer frame in a sliding mode along the extending direction of the track and is recessed downwards inside the bottom layer frame;

the transverse sliding layer frame is horizontally connected to the longitudinal sliding layer frame in a sliding mode along the direction vertical to the track, is downwards sunken in the longitudinal sliding layer frame, and is protruded above the bottom layer frame from the top end;

and the rotary swinging layer-moving frame is horizontally and rotatably connected to the top end of the transverse sliding layer-moving frame, and a supporting beam or a supporting flat plate suitable for supporting the part to be replaced is arranged on the rotary swinging layer-moving frame.

2. The device as claimed in claim 1, wherein a slewing bearing is fixedly connected to the center of the top of the transverse slipping layer frame, and the rotary swinging layer frame is fixedly connected to the rotating end of the slewing bearing.

3. The motor train unit vehicle bottom part replacement auxiliary device of claim 2, wherein a rotary driving assembly is arranged on the transverse slipping shelf, and an output end of the rotary driving assembly is connected with the rotary swinging shelf for driving the rotary swinging shelf to rotate.

4. The motor train unit underbody part replacement auxiliary device of claim 3, wherein the rotary drive assembly comprises:

the first support is fixedly connected to the transverse sliding layer frame;

the second support is fixedly connected to the transverse sliding layer frame and is aligned with the first support;

the first rotating rod is rotatably connected with the first support, one end of the first rotating rod penetrates through the first support and extends towards the second support, the peripheral wall of the extending end is provided with external threads, and the other end of the first rotating rod penetrates through the rotary swinging layer rack outwards and is provided with a first hand wheel;

one end of the spline shaft is provided with a first threaded hole suitable for being screwed and matched with the external thread, the other end of the spline shaft penetrates through the second support in a sliding mode along the axial direction of the first rotating rod, and the penetrating end of the spline shaft is hinged with a connecting rod;

and the connecting lug seat is fixedly connected with the side wall of the rotary swing layer moving frame and is hinged with the connecting rod.

5. The motor train unit underbody part replacement auxiliary device of claim 4, wherein the side wall of the rotary swing moving layer frame is provided with a long hole which extends horizontally and is suitable for the first rotating rod to pass through.

6. The motor train unit vehicle bottom part replacement auxiliary device as claimed in claim 1, wherein a third support protruding above the bottom frame is arranged on one side of the longitudinal sliding layer frame, a second rotating rod extending along the sliding direction of the transverse sliding layer frame is rotatably connected to the third support, a fourth support is fixedly connected to the transverse sliding layer frame, the fourth support is provided with a second threaded hole penetrating along the axial direction of the second rotating rod, wherein one end of the second rotating rod penetrates through the third support and is in screwed fit with the second threaded hole, and the other end of the second rotating rod extends to the outer side of the bottom frame and is provided with a second hand wheel.

7. The motor train unit vehicle bottom part replacement auxiliary device of claim 1, wherein a first bearing seat is arranged on a side wall of the bottom frame facing the sliding direction of the longitudinal sliding layer frame, a third rotating rod extending along the sliding direction of the longitudinal sliding layer frame is rotatably connected to the first bearing seat, a threaded sleeve is fixedly connected to the longitudinal sliding layer frame along the axial direction of the third rotating rod, one end of the third rotating rod penetrates through the first bearing seat and is in screwed fit with the threaded sleeve, and a third hand wheel is arranged at the other end of the third rotating rod.

8. The motor train unit bottom part replacement auxiliary device of claim 7, wherein a second bearing seat is arranged on a side wall of the bottom frame opposite to the first bearing seat, a fourth rotating rod is rotatably connected to the second bearing seat, one end of the fourth rotating rod penetrates through the second bearing seat along the axial direction of the third rotating rod and is fixedly connected with a rotary joint end of the third rotating rod, and a fourth hand wheel is arranged at the other end of the fourth rotating rod.

9. The motor train unit underbody part replacement auxiliary device of any one of claims 1 to 8, wherein two sets of slide block guide rail pairs are distributed at intervals between the transverse slipping layer frame and the longitudinal slipping layer frame and between the longitudinal slipping layer frame and the underlayer frame.

10. The motor train unit bottom part replacement auxiliary device as claimed in any one of claims 1-8, wherein four corner positions of the bottom frame are respectively provided with support legs extending vertically downwards, and two lifting lug plates extending out of the outer side of the bottom frame are distributed on two opposite side walls of the bottom frame at intervals.

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