A conveying device and detection method for offline detection of train wheels

Abstract

A conveying device and detection method for off-line detection of train wheels, belonging to the technical field of train wheel transportation. The conveying device for off-line detection of train wheels includes a guide rail arranged between the loading position and the detection position. A driving trolley is arranged on the guide rail and is in rolling connection with it. The upper end of the driving trolley is used for wheel bearing and positioning. Locking seats are respectively arranged at both ends of the guide rail, and locking mechanisms are respectively arranged at both ends of the driving trolley. The locking mechanisms are locked and connected with the corresponding locking seats. The beneficial effects of the present invention are that the present invention adds a process of manual secondary detection of the wheels, realizes automatic loading, conveying, and automatic unloading after detection of the wheels, realizes full-automatic control, improves the efficiency of secondary detection of the wheels, and reduces the missed detection rate of defective wheels.

Description

Technical Field

[0001] The present invention relates to the technical field of train wheel transportation, and particularly to a conveying device and a detection method for off-line detection of train wheels. Background Art

[0002] While international competition is becoming increasingly fierce, the requirements of the railway transportation system for the quality of train wheels are also getting higher and higher. Among all the processes of wheel production, the inspection process of finished wheels is particularly crucial. At present, in China, after the finished wheels are off-line from the wheel processing line, the subsequent wheel inspection process is carried out on the wheel inspection line. However, there is still a possibility of undetected wheels with appearance defects. Although the probability is very small, once the defective wheels are shipped out and installed on the train, it will pose a threat to the personal safety of passengers and also bring a negative impact to the company.

[0003] Therefore, how to reduce the undetected rate of defective wheels and avoid the shipment of defective wheels is an urgent problem to be solved at present. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a conveying device and a detection method for off-line detection of train wheels. After all the wheels are on-line detected, the off-line wheels are automatically conveyed to the detection position, and the process of manual secondary detection of the wheels is carried out, which reduces the undetected rate of defective wheels.

[0005] To achieve the above object, the technical solution adopted by the present invention to solve its technical problems is: the conveying device for off-line detection of train wheels includes a guide rail arranged between the loading position and the detection position, a driving trolley is arranged on the guide rail and is in rolling connection with it, the upper end of the driving trolley is positioned to carry the wheel, locking seats are respectively arranged at both ends of the guide rail, locking mechanisms are respectively arranged at both ends of the driving trolley, and the locking mechanisms are locked and connected with the corresponding locking seats.

[0006] The driving trolley includes a vehicle body. The bottom of the vehicle body is connected with a main transmission shaft and a driven transmission shaft that are parallel to each other through a bearing seat I. Both ends of the main transmission shaft are respectively connected with driving wheels, and both ends of the driven transmission shaft are respectively connected with driven wheels.

[0007] A reduction motor is also fixed on the vehicle body. The output end of the reduction motor is connected with one end of the main transmission shaft. A rotary encoder is installed in the reduction motor, and the rotary encoder is connected with the reduction motor through a PLC.

[0008] The locking mechanism includes a mounting seat I and a driving motor and a locking pin arranged therein. The mounting seat I is fixed at the end of the driving trolley. The driving motor is meshed with the locking pin through a gear to make the locking pin move up and down in the vertical direction, and the locking pin is inserted and positioned with the locking seat.

[0009] A displacement sensor for detecting the lifting displacement of the locking pin shaft is installed at the upper end of the mounting seat I; the displacement sensors at one end of the driving trolley are electrically connected to the feeding mechanism and the driving trolley through a PLC, and the feeding mechanism is electrically connected to the driving motor through a PLC; the displacement sensors at the other end of the driving trolley are electrically connected to the discharging mechanism and the driving trolley through a PLC, and the discharging mechanism is electrically connected to the driving motor through a PLC.

[0010] A rotating table frame is connected to the upper end of the driving trolley. The rotating table frame includes a mounting seat II. The bottom end of the mounting seat II is connected to the driving trolley, the upper end of the mounting seat II is connected to a bearing seat II, the bearing seat II is fixedly connected to a turntable through a vertical rotating shaft, and wheels are carried on the turntable.

[0011] The upper and lower ends of the bearing seat II are open, and bearings are respectively connected to both ends of the bearing seat II. One end of the vertical rotating shaft is cooperated with the two bearings and then extends out of the bottom end of the bearing seat II and is tightly connected with a locking nut, and the other end of the vertical rotating shaft extends out of the upper end of the bearing seat II and is connected to the turntable.

[0012] The upper end of the vertical rotating shaft extends out of the turntable to form a positioning projection, and the positioning projection is in positioning cooperation with the wheels; a nylon plate is installed on the upper surface of the turntable, a nylon sleeve is sleeved on the outer periphery of the positioning projection, the nylon plate and the nylon sleeve are in contact with the wheels, and a pressing plate is detachably connected to the upper end of the positioning projection, and the pressing plate is in contact connection with the upper end of the nylon sleeve.

[0013] Limit seats for blocking and limiting the driving trolley are respectively arranged at both ends of the guide rail, and a drag chain for facilitating cable laying is arranged between the two guide rails.

[0014] A method for detecting the offline of train wheels, using the described conveying device, includes the following steps:

[0015] Step 1: Feeding of the wheels; the driving trolley is located at the feeding position, and the locking mechanism close to the feeding position is locked with the corresponding locking seat, and the feeding mechanism places the wheels on the driving trolley.

[0016] Step 2: Unlock the locking mechanism, and the driving trolley runs to the detection position; after the feeding mechanism completes feeding, it sends a feeding completion signal to the PLC. The PLC controls the locking mechanism close to the feeding position to disengage from the locking seat, and then controls the driving trolley to run on the guide rail until it reaches the detection position.

[0017] Step 3: Lock the locking mechanism and check the appearance of the wheels; after the driving trolley reaches the detection position, the PLC controls the locking mechanism close to the detection position to lock with the corresponding locking seat, operates the rotating table frame at the upper end of the driving trolley to rotate the wheels, and visually inspects the appearance of the wheels manually.

[0018] Step 4: After inspection is completed, the wheels are shipped out, sent for repair, or scrapped; when there are no quality defects on the appearance of the wheels, the blanking mechanism transports the wheels to the qualified finished product position and then ships them out. When there are quality defects on the appearance of the wheels, the blanking mechanism transports the wheels to the qualified finished product position and then repairs or scraps them.

[0019] Step 5: The locking mechanism is unlocked, and the driving trolley returns to its original position; after the blanking mechanism discharges the material, it sends a signal indicating that the blanking is completed to the PLC. The PLC controls the locking mechanism near the detection position to disengage from the locking seat, and then controls the driving trolley to run on the guide rail until it reaches the loading position.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. By setting a guide rail between the loading position and the detection position in the present invention, the driving trolley used to carry the wheels runs on the guide rail. Moreover, by setting locking seats at both ends of the guide rail and locking mechanisms at both ends of the driving trolley, when the driving trolley is loading and detecting, the corresponding locking mechanisms are locked and matched with the corresponding locking seats, making the loading and detection of the wheels more stable, realizing the manual secondary detection after the wheels are off the production line, and reducing the missed detection rate of defective wheels.

[0022] 2. By connecting the driving trolley to a reduction motor and installing a rotary encoder in the reduction motor, the rotary encoder can detect the traveling distance of the driving trolley. After the PLC detects the in-place information through the rotary encoder, it can control the driving trolley to stop by controlling the reduction motor, realizing the automatic stop of the driving trolley at the loading position and the detection position.

[0023] 3. In the locking mechanism of the present invention, the driving motor drives the locking pin to move up and down through a gear-rack transmission mechanism, so that the automatic locking or disengagement of the locking shaft and the locking seat can be realized. Moreover, the displacement sensor can detect the moving distance of the locking pin inserted into the locking seat, which can be used to detect the locking and unlocking signals of the locking mechanism and transmit them to the PLC. By controlling the actions of the loading mechanism, the blanking mechanism, and the driving trolley through the PLC, the automatic loading, conveying, and blanking after detection of the wheels are realized, making the whole process achieve full-automatic control and improving the efficiency of the secondary detection of the wheels.

[0024] 4. By connecting a rotating table frame to the upper end of the driving trolley and positioning the wheel on the turntable in the present invention, the turntable can be rotated manually or electrically, so that the wheel can be visually inspected in all directions, eliminating the need for workers to walk around the periphery of the wheel for inspection, reducing the detection labor intensity of the workers, and making the inspection more comprehensive and accurate, further reducing the missed detection rate of defective wheels.

[0025] In summary, the present invention adds a process for manually secondarily inspecting the wheels, realizes automatic loading, conveying, and automatic unloading after inspection of the wheels, achieves full-automatic control, improves the efficiency of the secondary inspection of the wheels, and reduces the missed inspection rate of defective wheels. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following briefly describes the content expressed in each drawing of the specification of the present invention and the marks in the drawings:

[0027] Figure 1 is a schematic structural diagram of the conveying device in the present invention;

[0028] Figure 2 is Figure 1 a side view of;

[0029] Figure 3 is Figure 1 a schematic structural diagram of the locking mechanism in;

[0030] Figure 4 is Figure 1 a schematic structural diagram of the rotating table frame in;

[0031] The marks in the above-mentioned drawings are all: 1. Guide rail, 2. Driving trolley, 21. Vehicle body, 22. Bearing seat I, 23. Main transmission shaft, 24. Driven transmission shaft, 25. Driving wheel, 26. Driven wheel, 27. Reduction motor, 3. Locking seat, 4. Locking mechanism, 41. Mounting seat I, 42. Driving motor, 43. Locking pin shaft, 44. Gear, 45. Displacement sensor, 5. Rotating table frame, 51. Mounting seat II, 52. Bearing seat II, 53. Vertical rotating shaft, 54. Turntable, 55. Locking nut, 56. Nylon plate, 57. Nylon sleeve, 58. Pressure plate, 6. Limit seat, 7. Drag chain. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] As Figure 1 and Figure 2 shown, the present invention provides a conveying device for off-line detection of train wheels, including a guide rail 1 arranged between the loading position and the detection position. A driving trolley 2 that is in rolling connection with the guide rail 1 is arranged on the guide rail 1. The upper end of the driving trolley 2 is positioned to carry the wheel. Locking seats 3 are respectively arranged at both ends of the guide rail 1, and locking mechanisms 4 are respectively arranged at both ends of the driving trolley 2. The locking mechanisms 4 are tightly connected to the corresponding locking seats 3. The driving trolley 2 travels on the guide rail 1, carrying the wheel from the loading position to the detection position. Moreover, when loading and detecting, the corresponding locking mechanisms 4 of the driving trolley 2 are tightly matched with the corresponding locking seats 3, making the wheel loading and detection more stable, realizing the manual secondary detection after the wheels are off-line, and reducing the missed detection rate of defective wheels.

[0036] Specifically, the driving trolley 2 includes a vehicle body 21. The bottom of the vehicle body 21 is connected with a main transmission shaft 23 and a driven transmission shaft 24 that are parallel to each other through a bearing seat Ⅰ22. A bearing is installed in the bearing seat Ⅰ22, which can realize the free rotation of the main transmission shaft 23 and the driven transmission shaft 24. Moreover, a grease nipple is installed on the bearing seat Ⅰ22 for lubricating the bearing. Both ends of the main transmission shaft 23 are respectively connected with driving wheels 25, and both ends of the driven transmission shaft 24 are respectively connected with driven wheels 26. A reduction motor 27 is also fixed on the vehicle body 21. The output end of the reduction motor 27 is connected with one end of the main transmission shaft 23. By driving the driving wheels 25 connected to the main transmission shaft 23 through the reduction motor 27, the driven wheels 26 are driven to rotate, realizing the reciprocating sliding of the driving trolley 2 on the guide rail 1. A rotary encoder is installed in the reduction motor 27. The rotary encoder is connected to the reduction motor 27 through a PLC. The rotary encoder can detect the traveling distance of the driving trolley 2. After the PLC detects the in-place information through the rotary encoder, it can control the driving trolley 2 to stop by controlling the reduction motor 27, realizing the automatic stop of the driving trolley 2 at the loading position and the detection position.

[0037] Specifically, as Figure 3As shown in the figure, the locking mechanism 4 includes a mounting base I 41, a driving motor 42 and a locking pin 43 arranged therein. The mounting base I 41 is fixed at the end of the driving trolley 2. The driving motor 42 is meshed and connected with the locking pin 43 through a gear 44 to make the locking pin 43 move up and down in the vertical direction. The locking pin 43 is inserted and positioned with the locking seat 3, and the automatic locking or unlocking of the locking pin 43 can be realized.

[0038] A displacement sensor 45 for detecting the lifting displacement of the locking pin 43 is installed at the upper end of the mounting base I 41 to detect the locking and unlocking signals of the locking pin 43.

[0039] The displacement sensor 45 at one end of the driving trolley 2 is electrically connected to the feeding mechanism through the PLC. The feeding mechanism can be set as a handling robot, and the automatic feeding of the feeding mechanism is realized by controlling with the locking signal; the feeding mechanism is electrically connected to the driving motor 42 through the PLC, and the automatic unlocking of the locking pin 43 is realized after the wheels are automatically fed; the displacement sensor 45 at one end of the driving trolley 2 is electrically connected to the driving trolley 2 through the PLC, and after the locking pin 43 is automatically unlocked, the driving trolley 2 is made to drive towards the detection position for detecting the quality defects of the wheels.

[0040] The displacement sensor 45 at the other end of the driving trolley 2 is electrically connected to the discharging mechanism through the PLC. The discharging mechanism can also be set as a handling robot. After the driving trolley 2 reaches the detection position and stops, the PLC controls the locking pin 43 near the detection position to be locked with the corresponding locking seat 3, which is convenient for manual visual inspection of the appearance of the wheels. After the inspection is completed, the signal of the inspection completion is transmitted to the PLC, and the discharging mechanism is controlled by the PLC to discharge and transfer the wheels to the designated position, realizing the visual inspection and automatic discharging and transportation of the wheels; the discharging mechanism is electrically connected to the driving motor 42 through the PLC, and the automatic unlocking of the locking pin 43 is realized after the wheels are discharged; the displacement sensor 45 at the other end of the driving trolley 2 is electrically connected to the driving trolley 2 through the PLC, and after the locking pin 43 is automatically unlocked, the driving trolley 2 is made to drive towards the loading position.

[0041] Specifically, such as Figure 1 、 Figure 2 and Figure 4As shown in the figure, a rotating table frame 5 is connected to the upper end of the driving trolley 2. The rotating table frame 5 includes a mounting seat II 51. The bottom end of the mounting seat II 51 is connected to the driving trolley 2, and the upper end of the mounting seat II 51 is connected to a bearing seat II 52. The upper and lower ends of the bearing seat II 52 are open, and bearings are respectively connected to both ends of the bearing seat II 52. One end of a vertical rotating shaft 53 is fitted with the two bearings and then extends out of the bottom end of the bearing seat II 52 and is tightly connected with a locking nut 55. One end of the vertical rotating shaft 53 extending out of the bottom end of the bearing seat II 52 can also be connected to a motor. The other end of the vertical rotating shaft 53 extends out of the upper end of the bearing seat II 52 and is connected to a turntable 54. Wheels are carried on the turntable 54. By manually or electrically driving the turntable 54 to rotate, the wheels can be visually inspected in all directions, eliminating the need for workers to walk around the outer circumference of the wheels for inspection, reducing the labor intensity of the workers, and making the inspection more comprehensive and accurate, further reducing the missed inspection rate of defective wheels.

[0042] A positioning protrusion is formed by the upper end of the vertical rotating shaft 53 extending out of the turntable 54. The positioning protrusion is in positioning snap-fit with the wheel, preventing the wheel from falling off. To reduce the frictional damage of the wheel during rotation, a nylon plate 56 is installed on the upper surface of the turntable 54, a nylon sleeve 57 is sleeved on the outer circumference of the positioning protrusion. The nylon plate 56 and the nylon sleeve 57 are in contact with the wheel. The upper end of the positioning protrusion is detachably connected to a pressing plate 58 by bolts. The pressing plate 58 is in contact connection with the upper end of the nylon sleeve 57. The pressing plate 58 presses the nylon sleeve 57 against the nylon plate 56, making the structure more stable and facilitating the replacement of the nylon sleeve 57 and the nylon plate 56.

[0043] In addition, limit seats 6 for blocking and limiting the driving trolley 2 are respectively arranged at both ends of the guide rail 1, preventing the driving trolley 2 from overshooting. A drag chain 7 for facilitating the laying of cables is arranged between the two guide rails 1, making the cable layout more reasonable. Lifting rings for facilitating hoisting and transportation are also arranged around the upper end of the vehicle body of the driving trolley 2.

[0044] A method for offline inspection of train wheels using the above conveying device includes the following steps:

[0045] Step 1: Loading of the wheels: The driving trolley 2 is located at the loading position, and the locking mechanism 4 near the loading position is locked with the corresponding locking seat 3. The loading mechanism places the wheels on the driving trolley 2. Specifically, in the initial state, the driving trolley 2 is located at the loading position, and the locking pin shaft 43 near the loading position is inserted into the corresponding locking seat 3 under the action of the driving motor 42. When the displacement sensor 45 detects that the locking pin shaft 43 is inserted in place, it transmits a locking signal to the PLC, and the PLC controls the loading mechanism to place the wheels on the rotating table frame 5 of the driving trolley 2.

[0046] Step 2: The locking mechanism 4 is unlocked, and the driving trolley 2 runs to the detection position: After the feeding mechanism completes feeding, it sends a feeding completion signal to the PLC. The PLC controls the locking mechanism 4 near the feeding position to disengage from the locking seat 3, and then controls the driving trolley 2 to run on the guide rail 1 until it reaches the detection position. Specifically, after the feeding mechanism completes feeding, it sends a feeding completion signal to the PLC. The PLC controls the driving motor 42 near the feeding position to drive the locking pin 43 to disengage from the locking seat 3. When the displacement sensor 45 detects that the locking pin 43 is disengaged in place, it transmits an unlocking signal to the PLC. The PLC controls the reduction motor 27 to act, thereby driving the driving trolley 2 to run on the guide rail 1 until it reaches the detection position.

[0047] Step 3: The locking mechanism 4 is locked, and the appearance of the wheel is inspected: After the driving trolley 2 reaches the detection position, the PLC controls the locking mechanism 4 near the detection position to lock with the corresponding locking seat 3. Operate the rotating table frame 5 at the upper end of the driving trolley 2 to rotate the wheel, and visually inspect the appearance of the wheel manually. Specifically, after the driving trolley 2 reaches the detection position, the rotary encoder transmits a signal to the PLC. The PLC controls the reduction motor 27 to stop rotating, so as to position the driving trolley 2. At the same time, the PLC controls the driving motor 42 near the detection position to drive the locking pin 43 to insert into the corresponding locking seat 3. When the displacement sensor 45 detects that the locking pin 43 is inserted in place, it transmits a locking signal to the PLC. The PLC controls the motor to rotate the turntable 54 at the upper end of the driving trolley 2. Of course, the turntable 54 can also be rotated manually, thereby driving the wheel to rotate, and visually inspecting the appearance of the wheel manually.

[0048] Step 4: After the inspection is completed, the wheels are shipped out, repaired or scrapped; When the motor rotates a corresponding angle or the turntable 54 is rotated manually for a corresponding number of turns, the appearance inspection of the wheels is completed. When there are no quality defects in the appearance of the wheels, the blanking mechanism transports the wheels to the qualified finished product position and then ships them out. When there are quality defects in the appearance of the wheels, the blanking mechanism transports the wheels to the qualified finished product position and then repairs or scraps them.

[0049] Step 5: The locking mechanism 4 is unlocked, and the driving trolley 2 returns to its original position: After the blanking mechanism completes blanking, it sends a blanking completion signal to the PLC. The PLC controls the locking mechanism 4 near the detection position to disengage from the locking seat 3, and then controls the driving trolley 2 to run on the guide rail 1 until it reaches the feeding position. Specifically, the blanking mechanism grabs the wheels on the turntable 54 to make the wheels disengage from the turntable 54. At this time, the blanking mechanism sends a blanking completion signal to the PLC. The PLC controls the driving motor 42 near the detection position to drive the locking pin 43 to disengage from the locking seat 3. When the displacement sensor 45 detects that the locking pin 43 is disengaged in place, it transmits an unlocking signal to the PLC. The PLC controls the reduction motor 27 to act, thereby driving the driving trolley 2 to run on the guide rail 1 until it reaches the feeding position.

[0050] In summary, the present invention adds a process for manually re-inspecting the wheels, realizes automatic loading, conveying, and unloading of the wheels after inspection, achieves full-automatic control, improves the efficiency of the secondary inspection of the wheels, and reduces the missed inspection rate of defective wheels.

[0051] As described above, only some principles of the present invention are illustrated by diagrams. This specification is not intended to limit the present invention to the specific structures and application scopes shown and described. Therefore, all possible corresponding modifications and equivalents that can be utilized belong to the scope of the patent applied for by the present invention.

Claims

1. A conveying device for off-line detection of train wheels, characterized in that, it includes a guide rail arranged between the loading position and the detection position. A driving trolley is arranged on the guide rail and is in rolling connection with it. The upper end of the driving trolley bears and positions the wheel. Locking seats are respectively arranged at both ends of the guide rail, and locking mechanisms are respectively arranged at both ends of the driving trolley. The locking mechanisms are locked and connected with the corresponding locking seats; The locking mechanism includes a mounting seat I and a driving motor and a locking pin shaft arranged therein. The mounting seat I is fixed at the end of the driving trolley. The driving motor is meshed with the locking pin shaft through a gear to make the locking pin shaft perform a lifting action in the vertical direction. The locking pin shaft is inserted and positioned with the locking seat; A displacement sensor for detecting the lifting displacement of the locking pin shaft is installed at the upper end of the mounting seat I. The displacement sensor at one end of the driving trolley is electrically connected to the loading mechanism and the driving trolley through a PLC. The loading mechanism is electrically connected to the driving motor through a PLC. The displacement sensor at the other end of the driving trolley is electrically connected to the unloading mechanism and the driving trolley through a PLC. The unloading mechanism is electrically connected to the driving motor through a PLC; The upper end of the driving trolley is connected with a rotating table frame. The rotating table frame includes a mounting seat II. The bottom end of the mounting seat II is connected with the driving trolley. The upper end of the mounting seat II is connected with a bearing seat II. The bearing seat II is fixedly connected with a turntable through a vertical rotating shaft. The turntable bears the wheel; The upper end of the vertical rotating shaft extends out of the turntable to form a positioning protrusion. The positioning protrusion is in positioning cooperation with the wheel. A nylon plate is installed on the upper surface of the turntable. A nylon sleeve is sleeved on the outer periphery of the positioning protrusion. The nylon plate and the nylon sleeve are in contact with the wheel. A pressing plate is detachably connected to the upper end of the positioning protrusion. The pressing plate is in contact connection with the upper end of the nylon sleeve; Limit seats for blocking and limiting the driving trolley are respectively arranged at both ends of the guide rail. A drag chain for facilitating cable laying is arranged between the two guide rails; After all the wheels are on-line detected, the conveying device for off-line detection automatically conveys the off-line wheels to the detection position for the process of manually re-detecting the wheels.

2. The conveying device for off-line detection of train wheels according to claim 1, characterized in that: The driving trolley includes a vehicle body. The bottom of the vehicle body is connected with a main transmission shaft and a driven transmission shaft which are parallel to each other through a bearing seat I. The two ends of the main transmission shaft are respectively connected with driving wheels, and the two ends of the driven transmission shaft are respectively connected with driven wheels.

3. The conveying device for off-line detection of train wheels according to claim 2, characterized in that: A reduction motor is also fixed on the vehicle body. The output end of the reduction motor is connected with one end of the main transmission shaft. A rotary encoder is installed in the reduction motor. The rotary encoder is connected with the reduction motor through a PLC.

4. The conveying device for off-line detection of train wheels according to claim 1, characterized in that: The upper and lower ends of the bearing block II are open, and bearings are respectively connected to both ends of the bearing block II. One end of the vertical rotating shaft is engaged with the two bearings and then extends out of the bottom end of the bearing block II and is tightly connected with a lock nut. The other end of the vertical rotating shaft extends out of the upper end of the bearing block II and is connected to the turntable.

5. A method for detecting the offline of train wheels, using the conveying device according to any one of claims 1 to 4, characterized in that: it includes the following steps: Step 1: Loading of the wheels; the driving trolley is located at the loading position, and the locking mechanism near the loading position is locked with the corresponding locking seat, and the loading mechanism places the wheels on the driving trolley; Step 2: Unlock the locking mechanism, and the driving trolley runs to the detection position; after the loading mechanism completes the loading, it sends a loading completion signal to the PLC. The PLC controls the locking mechanism near the loading position to disengage from the locking seat, and then controls the driving trolley to run on the guide rail until it reaches the detection position; Step 3: Lock the locking mechanism and inspect the appearance of the wheels; after the driving trolley reaches the detection position, the PLC controls the locking mechanism near the detection position to be locked with the corresponding locking seat, operates the rotating table frame at the upper end of the driving trolley to rotate the wheels, and visually inspects the appearance of the wheels manually; Step 4: After inspection, the wheels are shipped out, repaired or scrapped; when there are no quality defects in the appearance of the wheels, the unloading mechanism transports the wheels to the qualified finished product position and then ships them out. When there are quality defects in the appearance of the wheels, the unloading mechanism transports the wheels to the qualified finished product position and then repairs or scraps them; Step 5: Unlock the locking mechanism, and the driving trolley returns to the original position; after the unloading mechanism unloads the materials, it sends an unloading completion signal to the PLC. The PLC controls the locking mechanism near the detection position to disengage from the locking seat, and then controls the driving trolley to run on the guide rail until it reaches the loading position.

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