A rail vehicle wheelset dimension measuring instrument

Abstract

The present invention relates to the field of dimension measurement technology, and discloses a rail vehicle wheel pair dimension measuring instrument, including a base plate, a wheel fixing bracket is arranged at the end of the base plate, and also includes a transverse mechanism and a lifting mechanism; the transverse mechanism includes a first fixed plate arranged on both sides of the base plate, the first fixed plate is fixedly connected to the end of a guide slide rod, and the two sides of the guide slide rod are slidably connected to a transverse seat; the lifting mechanism includes a support rod arranged at the end of the transverse seat, the middle part of the support rod is slidably connected to a lifting seat, and the middle part of the transverse seats on both sides are provided with a lifting screw connected to the lifting seat threadedly, and the lifting screws on both sides drive the lifting seats on both sides to rise and fall synchronously and equidistantly, and the lifting seat is provided with a detection probe assembly that contacts the tread and rim of the wheel respectively on one side close to the center of the base plate. The detection roller on the detection probe assembly in the present invention can perform effective dimension detection processing on the rim and tread of the wheel respectively.

Description

Technical Field

[0001] The invention relates to the technical field of dimension measurement, in particular to a rail vehicle wheelset dimension measuring instrument. Background Art

[0002] The wheel set is the part of the locomotive vehicle that contacts the rails. It consists of two left and right wheels firmly pressed onto the same axle. In order to ensure the normal operation of the rail vehicle, the size of the wheel needs to be inspected after processing.

[0003] Conventional wheel set size measuring instruments only have rollers on the upper and lower sides of the wheel to detect the diameter change of the tread part of the wheel. However, the wheels of rail vehicles also include rims, and ordinary wheel set sizes cannot be effectively detected and processed, so improvement is needed. Summary of the invention

[0004] The present invention provides a rail vehicle wheelset dimension measuring instrument, which solves the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A rail vehicle wheel set size measuring instrument comprises a base plate, a wheel fixing bracket is arranged at the end of the base plate, and also comprises a transverse movement mechanism and a lifting mechanism; the transverse movement mechanism comprises a first fixing plate arranged at both sides of the base plate, the first fixing plate is fixedly connected to the end of a guide slide bar, and transverse movement seats are slidably connected to both sides of the guide slide bar, and a spacing adjustment component is arranged on the side of the base plate, and the spacing adjustment component is used to drive the two transverse movement seats to move in opposite directions, synchronously and equidistantly; the lifting mechanism comprises a support rod arranged at the end of the transverse movement seat, and a lifting seat is slidably connected to the middle part of the support rod, and lifting screws threadedly connected to the lifting seat are arranged in the middle part of the transverse movement seats on both sides, and the lifting screws on both sides drive the lifting seats on both sides to rise and fall synchronously and equidistantly, and a detection probe assembly that contacts the tread and wheel rim of the wheel respectively is arranged on the side of the lifting seat close to the center of the base plate.

[0007] As a preferred technical solution of the present invention, the detection probe assembly includes an extension beam fixedly connected to the middle of the lifting seat, the end of the extension beam is fixedly connected to the middle of the second fixed frame, the end of the second fixed frame is rotatably connected to the main shaft, the middle of the main shaft is fixedly connected to the rotating block, the side of the rotating block is slidably connected to the lifting slide rod, the end of the lifting slide rod is fixedly connected to the support plate, the middle of the support plate is provided with a detection roller that cooperates with the wheel, the outer sleeve of the lifting slide rod is provided with a lifting spring that drives the support plate to move away from the rotating block, and the middle of the rotating block is provided with a second displacement detection sensor that detects the distance between the support plate and the rotating block. The cross section of the rotating block is rectangular, and the two sides of the second fixed frame are slidably connected to the blocking slide rod, and the side of the blocking slide rod close to the rotating block is provided with a blocking platform that fits the side of the rotating block, and the end of the blocking slide rod away from the rotating block is provided with a pull plate, and a blocking spring that drives the blocking platform to move toward the rotating block is provided between the pull plate and the second fixed frame.

[0008] As a preferred technical solution of the present invention, the spacing adjustment assembly includes a transverse frame arranged in the middle of the base plate, the middle of the transverse frame is rotatably connected to a transverse screw rod arranged vertically with the guide slide rod, the middle of the transverse screw rod is threadedly connected to a transverse push plate, both ends of the transverse push plate are rotatably connected to push rods, and the end of the push rod away from the transverse push plate is rotatably connected to the end of the transverse seat. A transverse spring for driving the transverse seat to move toward the center of the base plate is arranged between the first fixed plate and the transverse seat, and a first displacement detection sensor for detecting the displacement distance of the transverse seat is arranged in the middle of the first fixed plate. A guide bar is arranged on the base plate, and the guide bar is slidably connected to a fixed block fixedly connected to the transverse frame, and limit holes are arranged on both sides of the guide bar, and a limit plate is arranged on the fixed block, and the limit plate is slidably connected to a limit rod matched with the limit hole, and the outer side of the limit rod is sleeved with a limit spring for driving the limit rod to move toward the guide bar.

[0009] As a preferred technical solution of the present invention, the lifting screw is fixedly connected to a driven pulley, and the driven pulleys on both sides are connected to the two sides of the synchronous belt. The transverse push plate is provided with a belt drive assembly that drives the synchronous belt to rotate. The belt drive assembly includes a first fixed frame fixedly connected to the transverse push plate, and the end of the first fixed frame away from the guide slide is provided with a second fixed plate, and the second fixed plate is rotatably connected to a rotating shaft, and the middle of the rotating shaft is provided with a driving pulley that cooperates with the synchronous belt. The end of the first fixed frame close to the guide slide is slidably connected to a push rod, and the end of the push rod away from the guide slide is provided with a top frame, and the top frame is rotatably connected to a top wheel that cooperates with the synchronous belt, and the outer sleeve of the push rod is provided with a tension spring that drives the push rod to move in the direction away from the guide slide, and the synchronous belt is in a V-shaped state.

[0010] The present invention has the following benefits:

[0011] By designing the detection probe assembly to be able to switch freely between a horizontal state and a vertical state, the detection roller on the detection probe assembly can respectively perform effective size detection processing on the wheel rim and the tread. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 The present invention is a structural schematic diagram of a railway vehicle wheelset dimension measuring instrument.

[0014] Figure 2 The figure is a top view of a rail vehicle wheelset dimension measuring instrument.

[0015] Figure 3 The present invention is a structural schematic diagram of a transverse movement mechanism in a rail vehicle wheelset dimension measuring instrument.

[0016] Figure 4 The present invention is a schematic diagram of the structure of a transverse frame in a rail vehicle wheelset dimension measuring instrument.

[0017] Figure 5 The present invention is a schematic diagram of the structure of the cooperation between a fixed block and a guide strip in a rail vehicle wheelset dimension measuring instrument.

[0018] Figure 6 The present invention is a structural schematic diagram of a lifting mechanism in a rail vehicle wheelset dimension measuring instrument.

[0019] Figure 7 The present invention is a schematic diagram of the structure of a belt drive assembly in a rail vehicle wheelset dimension measuring instrument.

[0020] Figure 8 The present invention is a structural schematic diagram of the cooperation between a lifting screw rod and a lifting seat in a rail vehicle wheelset dimension measuring instrument.

[0021] Fig. 9 The present invention is a structural schematic diagram of a vertical state detection probe assembly in a rail vehicle wheelset dimension measuring instrument.

[0022] Fig.10 The present invention is a structural schematic diagram of a horizontal state detection probe assembly in a rail vehicle wheelset dimension measuring instrument.

[0023] In the figure: 1. bottom plate; 2. wheel fixing bracket; 3. transverse mechanism; 4. lifting mechanism; 5. first fixed plate; 6. guide slide bar; 7. first displacement detection sensor; 8. transverse spring; 9. transverse seat; 10. push rod; 11. transverse push plate; 12. transverse frame; 13. transverse screw rod; 14. fixing block; 15. spacing adjustment assembly; 16. guide strip; 17. limit plate; 18. limit rod; 19. limit spring; 20. limit hole; 21. belt drive assembly; 22. synchronous belt; 23. support rod; 24. driven pulley; 25. lifting wire Rod; 26, lifting seat; 27, top plate; 28, detection probe assembly; 29, first fixed frame; 30, active pulley; 31, second fixed plate; 32, top wheel; 33, top frame; 34, top rod; 35, tension spring; 36, rotating shaft; 37, guide pulley; 38, pull plate; 39, blocking spring; 40, extending beam; 41, second fixed frame; 42, blocking slide bar; 43, blocking platform; 44, rotating block; 45, main shaft; 46, lifting slide bar; 47, second displacement detection sensor; 48, lifting spring; 49, support plate; 50, detection roller. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In one embodiment, see Figure 1-Figure 10 A rail vehicle wheel set size measuring instrument comprises a base plate 1, a wheel fixing bracket 2 is arranged at the end of the base plate 1, the wheel fixing bracket 2 can support the wheel so that the wheel keeps a horizontal state and rotates stably, the wheel is normally provided with an axle, the wheel fixing bracket 2 is used to fix the axle and drive the axle to rotate, and also comprises a transverse movement mechanism 3 and a lifting mechanism 4;

[0026] The transverse movement mechanism 3 includes a first fixed plate 5 arranged on both sides of the bottom plate 1. The first fixed plate 5 is arranged in the middle of the left and right sides of the bottom plate 1 in a front-to-back direction. The ends of the guide slide bars 6 arranged in a left-to-right direction are fixedly connected to the front and rear ends of the first fixed plate 5. The left and right sides of the guide slide bars 6 are slidably connected to transverse movement seats 9 arranged in a front-to-back direction. A spacing adjustment component 15 is arranged in the middle of the front side of the bottom plate 1. The spacing adjustment component 15 can push the transverse movement seats 9 on the left and right sides to move in opposite directions, synchronously and equidistantly. The two transverse movement seats 9 move closer to each other or move away from each other, thereby realizing synchronous detection and processing of the wheels on both sides.

[0027] The lifting mechanism 4 includes a support rod 23 vertically arranged at the front and rear ends of the transverse displacement seat 9, the middle part of the support rod 23 is slidably connected with a lifting seat 26 arranged in a front-to-rear direction, the top of the support rod 23 is fixedly connected to the top plate 27, the middle part of the top plate 27 is rotatably connected to the upper end of the lifting screw rod 25, the lower end of the lifting screw rod 25 is rotatably connected to the middle part of the upper surface of the transverse displacement seat 9, the middle part of the lifting screw rod 25 is threadedly connected to the middle part of the lifting seat 26, the lifting screw rods 25 on the left and right sides rotate synchronously, thereby driving the lifting seats 26 on the left and right sides to rise and fall synchronously, and a detection probe assembly 28 is arranged on one side of the lifting seat 26 close to the center of the bottom plate 1 to detect the size of the wheel, and the detection probe assembly 28 can be rotated to a horizontal state and a vertical state, so that the tread and the rim of the wheel can be effectively detected by the detection probe assembly 28.

[0028] In one case of the present embodiment, the detection probe assembly 28 includes an extending beam 40 fixed to the lifting seat 26 near the center of the bottom plate 1 in a left-right direction, and the end of the extending beam 40 is fixedly connected to a second fixed frame 41 arranged in a front-to-back direction. The second fixed frame 41 is a U-shaped structure with an opening upward, and a main shaft 45 arranged in a front-to-back direction is rotatably connected to the upper end of the second fixed frame 41, and the middle part of the main shaft 45 is fixedly connected to a rotating block 44 arranged in a front-to-back direction. Figure 2 In the state, lifting slide bars 46 are vertically arranged on the front and rear sides of the upper surface of the rotating block 44, and the upper ends of the lifting slide bars 46 are fixedly connected to the supporting plates 49 arranged in the front and rear directions. A detection roller 50 is arranged in the middle of the upper surface of the supporting plate 49, and the detection roller 50 can rotate back and forth. The detection roller 50 rolls along the surface of the wheel. If the size of the wheel changes, the position of the detection roller 50 will change. At this time, a second displacement detection sensor 47 can be arranged in the middle of the rotating block 44, and the extension rod of the second displacement detection sensor 47 is fixed on the supporting plate 49, so that when the position of the detection roller 50 changes, the second displacement detection sensor 47 can detect in real time, thereby achieving the effect of size measurement, and a lifting screw 25 is sleeved on the outside of the lifting slide bar 46, and the lifting screw 25 is located between the supporting plate 49 and the rotating block 44. The lifting screw 25 will push the supporting plate 49 outward, so that the detection roller 50 will press against the surface of the wheel during the detection process.

[0029] Since the detection probe assembly 28 needs to be rotated to a horizontal state and a vertical state, a component for angle limiting needs to be provided. A vertically arranged blocking slide bar 42 is slidably connected to the front and rear sides of the second fixed frame 41, and the upper end of the blocking slide bar 42 is fixedly connected to a horizontally arranged blocking platform 43, and the cross section of the rotating block 44 is designed to be a rectangular structure, so when the rotating block 44 drives the upper detection roller 50 to rotate ninety degrees, the blocking platform 43 rises and fits with the lower surface of the rotating block 44, and the rotating block 44 will stop rotating at this time, thereby achieving the effect of angle limiting, and a pull plate 38 is provided at the lower end of the blocking slide bar 42, and the blocking platform 43 can be pulled downward by the pulling plate 38, so that the rotating block 44 can rotate normally to achieve angle change, and a blocking spring 39 is provided between the pulling plate 38 and the second fixed frame 41, and the blocking spring 39 will push the blocking slide bar 42 upward, so that the blocking platform 43 will be close to the lower surface of the rotating block 44 during normal operation, thereby ensuring the stable orientation of the detection roller 50.

[0030] In one case of the present embodiment, the spacing adjustment component 15 includes a transverse frame 12 in the middle of the front side of the upper surface of the base plate 1. The transverse frame 12 is a U-shaped structure facing forward and backward. A transverse push plate 11 arranged in a left and right direction is slidably connected to the left and right side rods of the transverse frame 12. The front and rear sides of a transverse screw rod 13 facing forward and backward are rotatably connected to the front and rear side rods of the transverse frame 12. The middle part of the transverse screw rod 13 is threadedly connected to the transverse push plate 11, so that the transverse push plate 11 is driven to move forward and backward through the transverse screw rod 13. The front ends of the push rods 10 are fixedly connected to the left and right ends of the transverse push plate 11, and the rear end of the push rods 10 is rotatably connected to the front end of the transverse seat 9. Therefore, when the transverse push plate 11 moves backward, the push rod 10 will push the two transverse seats 9 to slide in the direction away from the center of the base plate 1. When the transverse push plate 11 moves toward When moving forward, the transverse seats 9 will move closer to each other, and in order to ensure that the transverse push plate 11 can move more stably, a transverse spring 8 is arranged between the first fixed plate 5 and the transverse seat 9, and the transverse springs 8 on both sides will push the transverse seat 9 toward the middle, so that the transverse push plate 11 only needs to provide a force to separate the transverse seat 9. Through the dual cooperation of the transverse push plate 11 and the transverse spring 8, the transverse seat 9 can be stably displaced. The movement of the transverse seat 9 represents the lateral movement of the upper detection roller 50. Therefore, a first displacement detection sensor 7 arranged in a left-right direction is arranged in the middle of the first fixed plate 5. The extension rod of the first displacement detection sensor 7 is fixed on the transverse seat 9, and the left-right displacement of the transverse seat 9 is detected by the first displacement detection sensor 7, that is, the left-right displacement of the detection roller 50.

[0031] In one case of the present embodiment, in order to protect the detection probe assembly 28 when installing the wheel axle, the two detection probe assemblies 28 need to be separated to both sides, and then the middle is pulled when the detection is performed. At this time, the transverse mechanism 3 needs to move over a large range, and the use of the transverse screw rod 13 for adjustment will affect the efficiency. Therefore, guide strips 16 set in the front and rear directions can be set on the left and right sides of the upper surface of the base plate 1, and the guide strips 16 are slidably connected to the fixed block 14. The upper end of the fixed block 14 is fixedly connected to the left and right sides of the rear side of the transverse frame 12. The sliding of the fixed block 14 and the guide strips 16 allows the transverse frame 12 to move quickly back and forth over a large range, so that the transverse seat 9 can be quickly displaced left and right, and limit holes 20 are set on the front and rear sides of the upper surface of the guide strips 16. A limit plate 17 is set on the rear side, and the limit plate 17 is slidably connected to a vertically set limit rod 18. The outer side of the limit rod 18 is sleeved with a limit spring 19 that drives the limit rod 18 to move downward. Therefore, when the limit rod 18 moves to just above the limit hole 20, the limit spring 19 will push the limit rod 18 to insert into the limit hole 20, thereby achieving the effect of limiting the position of the transverse movement frame 12. Therefore, when the limit rod 18 is inserted into the limit hole 20 on the rear side, the transverse movement frame 12 is located at the rearmost side. At this time, the distance between the two transverse movement seats 9 is large, and the wheel installation work can be carried out. When the limit rod 18 is inserted into the limit hole 20 on the front side, the transverse movement frame 12 is located at the frontmost side. At this time, the positions of the two transverse movement seats 9 are small, and the wheel size detection processing can be carried out. At this time, the transverse movement seat 9 is moved in a small range by the transverse movement screw rod 13.

[0032] In one case of the present embodiment, a driven pulley 24 is provided at the lower end of the lifting screw rod 25, and the driven pulleys 24 on the left and right sides are connected to the left and right sides of the synchronous belt 22, so that the lifting screw rods 25 on the left and right sides can move synchronously, and the lifting seats 26 on the left and right sides can be lifted and lowered synchronously. In order to facilitate the operator to use the present device, a belt driving assembly 21 is provided in the middle of the upper surface of the transverse push plate 11 to drive the synchronous belt 22 to rotate. The belt driving assembly 21 includes a first fixed frame 29 provided in the middle of the upper surface of the transverse push plate 11. The first fixed frame 29 is provided in a front-to-back direction, and the first fixed frame 29 is a U-shaped structure with an opening upward. A second fixed plate 31 is provided at the front end of the first fixed frame 29. The middle part of the second fixed plate 31 is rotatably connected to a vertically arranged rotating shaft 36. The middle part of the rotating shaft 36 is fixedly connected to a driving pulley 30. The front side of the driving pulley 30 is in contact with the synchronous belt 22. Therefore, when the rotating shaft 36 rotates, the driving pulley 30 can drive The front end of the top frame 33 is rotatably connected to the top wheel 32, and a tensioning spring 35 is provided on the rear side of the top rod 34. The tensioning spring 35 will push the top rod 34 to the front side, and the front side of the top wheel 32 will press against the rear side surface of the synchronous belt 22. The deformation of the tensioning spring 35 makes the synchronous belt 22 always keep the tensioned state, and at this time the entire synchronous belt 22 presents a hollow V-shaped structure. The two sides of the synchronous belt 22 are expanded or retracted with the displacement of the transverse movement seat 9, so that the synchronous belt 22 can always maintain the driving effect on the driven pulley 24 when the total length of the transverse movement seat 9 remains unchanged during the movement. In order to avoid interference between the synchronous belt 22 and the support rod 23, a guide pulley 37 cooperating with the synchronous belt 22 is provided under the front support rod 23, so that the synchronous belt 22 can rotate smoothly.

[0033] During the implementation of this embodiment, the limit rod 18 is first pulled out, and the transverse frame 12 is pushed to the rear side of the guide bar 16. The limit rod 18 will be inserted into the limit hole 20 again, and the two detection probe assemblies 28 are at the farthest end. At this time, the axle of the vehicle is fixed to the wheel fixing bracket 2, and a rotating drive assembly is provided on the wheel fixing bracket 2 to drive the wheel to rotate. At this time, the limit rod 18 is pulled out again, and the transverse frame 12 is pulled to move to the front side. The limit rod 18 is inserted into the limit hole 20 on the front side. At this time, the two detection probe assemblies 28 are close to each other next to the wheel, and the size detection process can be prepared at this time.

[0034] The size detection of the tread, the pull plate 38 is moved downward, the blocking platform 43 moves to the low position, and the rotating block 44 is rotated at this time to rotate the detection roller 50 upward, release the pull plate 38, and the blocking platform 43 supports the rotating block 44. At this time, the wheel is driven to rotate by the wheel fixing bracket 2. First, the transverse push plate 11 is driven forward by the transverse screw rod 13, and the two transverse seats 9 move closer to each other, and the detection roller 50 moves to the bottom of the tread, and the rotating shaft 36 is rotated. The lifting screw rod 25 drives the lifting seat 26 to move upward. At this time, the detection roller 50 moves upward and contacts with the tread of the wheel, and the lifting spring 48 is slightly compressed. At this time, when the wheel is rolling, if the tread is irregular, the detection roller 50 will jump up and down, so that the second displacement detection sensor 47 can obtain the dimensional deformation in real time, thereby obtaining the dimensional parameters, and the first displacement detection sensor 7 and the second displacement detection sensor 47 can detect the left and right moving distance and the up and down moving distance of the detection roller 50, so the absolute value of the diameter of the wheel tread can also be obtained. Furthermore, since the detection roller 50 is relatively small and the tread is an inclined surface, the heights of the detection roller 50 when in contact with different positions of the tread are different, thereby obtaining a change in the slope of the tread.

[0035] For wheel rim size detection, the detection roller 50 is moved in the reverse direction so that it is away from the wheel. At this time, the pull plate 38 can be moved downward, the blocking platform 43 is disengaged from the rotating block 44, and the detection roller 50 is rotated to a horizontal state toward the center position of the bottom plate 1. At this time, the detection roller 50 is again driven to press against the wheel rim through the transverse movement mechanism 3 and the lifting mechanism 4. At this time, if the size of the wheel rim changes during the rotation of the wheel, the second displacement detection sensor 47 can still obtain the relevant size change.

[0036] The present invention is applicable to a rail vehicle wheel set dimension measuring instrument. By designing the detection probe assembly 28 to be freely switchable between a horizontal state and a vertical state, the detection roller 50 on the detection probe assembly 28 can respectively perform effective dimension detection processing on the wheel rim and the tread.

[0037] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A rail vehicle wheel set dimension measuring instrument, comprising a base plate, a wheel fixing bracket is arranged at the end of the base plate, characterized in that: It also includes a transverse movement mechanism and a lifting mechanism; The transverse movement mechanism comprises a first fixed plate arranged on both sides of the bottom plate, the first fixed plate is fixedly connected to the end of the guide slide bar, the two sides of the guide slide bar are slidably connected to the transverse movement seat, and the side of the bottom plate is provided with a spacing adjustment component, and the spacing adjustment component is used to drive the two transverse movement seats to move in opposite directions, synchronously and equidistantly; The lifting mechanism includes a support rod arranged at the end of the transverse displacement seat, the middle part of the support rod is slidably connected with the lifting seat, the middle part of the transverse displacement seats on both sides is provided with a lifting screw rod threadedly connected with the lifting seat, the lifting screw rods on both sides drive the lifting seats on both sides to rise and fall synchronously and equidistantly, a detection probe assembly is arranged on the side of the lifting seat close to the center of the bottom plate, and the detection probe assembly can be rotated to a horizontal state and a vertical state, and the tread and rim of the wheel are both dimensionally detected by the detection probe assembly, and the detection probe assembly includes an extension beam fixedly connected to the middle part of the lifting seat, the end of the extension beam is fixedly connected to the middle part of the second fixed frame, the end of the second fixed frame is rotatably connected to the main shaft, and the middle part of the main shaft is fixed A rotating block is connected, and a lifting slide bar is slidably connected to the side of the rotating block, and the end of the lifting slide bar is fixedly connected to a support plate, a detection roller cooperating with the wheel is arranged in the middle of the support plate, and a lifting spring is sleeved on the outer side of the lifting slide bar for driving the support plate to move in a direction away from the rotating block, and a second displacement detection sensor for detecting the distance between the support plate and the rotating block is arranged in the middle of the rotating block. The cross-section of the rotating block is rectangular, and blocking slide bars are slidably connected to both sides of the second fixed frame, and a blocking platform that fits the side of the rotating block is arranged on the side of the blocking slide bar close to the rotating block, and a pulling plate is arranged on the end of the blocking slide bar away from the rotating block, and a blocking spring that drives the blocking platform to move toward the rotating block is arranged between the pulling plate and the second fixed frame.

2. A rail vehicle wheelset dimension measuring instrument according to claim 1, characterized in that: The spacing adjustment assembly includes a transverse frame arranged in the middle of the base plate, the middle of the transverse frame is rotatably connected to a transverse screw rod arranged vertically with the guide slide rod, the middle of the transverse screw rod is threadedly connected to a transverse push plate, both ends of the transverse push plate are rotatably connected to push rods, and the end of the push rod away from the transverse push plate is rotatably connected to the end of the transverse seat.

3. A rail vehicle wheelset dimension measuring instrument according to claim 2, characterized in that: A transverse shift spring is arranged between the first fixed plate and the transverse shift seat for driving the transverse shift seat to move toward the center direction of the bottom plate, and a first displacement detection sensor for detecting the displacement distance of the transverse shift seat is arranged in the middle of the first fixed plate.

4. A rail vehicle wheelset dimension measuring instrument according to claim 2, characterized in that: A guide bar is provided on the bottom plate, and the guide bar is slidably connected to a fixed block fixedly connected to the transverse frame. Limiting holes are provided on both sides of the guide bar, and a limiting plate is provided on the fixed block. The limiting plate is slidably connected to a limiting rod matched with the limiting hole, and a limiting spring is sleeved on the outer side of the limiting rod for driving the limiting rod to move toward the guide bar.

5. The rail vehicle wheelset dimension measuring instrument according to claim 2, characterized in that: The lifting screw is fixedly connected to a driven pulley, and the driven pulleys on both sides are connected to the two sides of the synchronous belt. The transverse push plate is provided with a belt driving component for driving the synchronous belt to rotate.

6. A rail vehicle wheelset dimension measuring instrument according to claim 5, characterized in that: The belt drive assembly includes a first fixed frame fixedly connected to the transverse push plate, a second fixed plate is arranged at one end of the first fixed frame away from the guide slide rod, the second fixed plate is rotatably connected to a rotating shaft, and a driving pulley cooperating with a synchronous belt is arranged in the middle of the rotating shaft.

7. A rail vehicle wheelset dimension measuring instrument according to claim 6, characterized in that: The end of the first fixed frame close to the guide slide rod is slidably connected to a push rod, and the end of the push rod away from the guide slide rod is provided with a top frame, the top frame is rotatably connected to a top wheel that cooperates with a synchronous belt, and the outer sleeve of the push rod is provided with a tightening spring that drives the push rod to move in a direction away from the guide slide rod, and the synchronous belt is in a V-shaped state.

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