Automatic detection equipment for hub bearing hole of rear chain wheel

Abstract

A rear sprocket wheel hub bearing hole automatic detection device of the present invention comprises an operation table, a bottom plate, an electronic air gauge and a measuring head, the electronic air gauge is installed at the top of the bottom plate, a support is arranged at the bottom of the operation table, a PLC display control cabinet is installed at the top of the electronic air gauge, and a double-rod cylinder is installed at the top of the bottom plate. The top of the double-rod air cylinder is provided with a moving plate, the top of the moving plate is provided with a supporting block, the top of the measuring head is provided with a rear chain wheel hub, the rear chain wheel hub is internally provided with a bearing hole, the front side of the electronic pneumatic measuring instrument is provided with a transmission pipe, the front side of the PLC display control cabinet is provided with a second display screen, and the front side of the PLC display control cabinet is provided with an alarm lamp. A buzzer is arranged on the front side of the PLC display control cabinet, an air inlet pipe is arranged on the back face of the electronic air gauge, an identification feedback interface is increased, the identification degree is improved, time and manpower are saved, visual fatigue is reduced, the warning reminding function is achieved, misjudgment is avoided, the feedback capacity is improved, and the product detection quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle parts detection, and in particular to an automatic detection device for a rear sprocket hub bearing hole. Background Art

[0002] After the rear sprocket hub of a motorcycle is die-cast, it needs to be machined to meet technical requirements such as dimensional accuracy, because the main function of the rear sprocket hub is buffering and transmission, ensuring the stability and safety of the motorcycle during driving, and it is an important safety component. The bearing hole is an important assembly hole of the rear sprocket hub. A small hole cannot press the bearing in, and a large hole will cause the bearing to fall off. High precision is required, so the bearing hole needs to be fully inspected after processing. In the past, the inspection method was that the operator used an ordinary pneumatic measuring instrument to check the workpiece after processing, put the probe into the bearing hole, and visually inspected the float position of the pneumatic measuring instrument to determine whether it was within the qualified range. However, the long-term inspection process consumes manpower, the operator's concentration is limited, and visual fatigue is prone to occur, there is a risk of misjudgment, and the quality of product inspection is affected. Summary of the invention

[0003] The present invention aims to solve the problems existing in the above-mentioned prior art and provides an automatic detection device for the bearing hole of the rear sprocket hub, which can increase the size of the identification feedback interface to improve the recognition, save time and manpower and reduce visual fatigue, and has a warning reminder function to avoid misjudgment, and the feedback capability is improved to ensure the product inspection quality.

[0004] The present invention solves the technical problem by adopting a technical solution: the rear sprocket hub bearing hole automatic detection equipment comprises an operating table, a base plate, an electronic pneumatic measuring instrument and a probe, the electronic pneumatic measuring instrument is installed on the top of the base plate, the base plate is arranged on the top of the operating table, a bracket is arranged at the bottom of the operating table, a PLC display control cabinet is installed on the top of the electronic pneumatic measuring instrument, a double-rod cylinder is installed on the top of the base plate, a moving plate is installed on the top of the double-rod cylinder, a supporting block is arranged on the top of the moving plate, the probe is installed on the top of the supporting block, a rear sprocket hub is arranged on the top of the probe, a bearing hole is opened inside the rear sprocket hub, and the bearing hole is sleeved on the measuring head. The front side surface of the head, the front side of the electronic pneumatic measuring instrument is provided with a transmission tube, the end of the transmission tube is connected with the measuring head, the front side of the electronic pneumatic measuring instrument is provided with a scale line, the front side of the electronic pneumatic measuring instrument is provided with a light column buoy, the front side of the electronic pneumatic measuring instrument is provided with a first display screen, the front side of the electronic pneumatic measuring instrument is provided with a button, the front side of the PLC display control cabinet is provided with a second display screen, the front side of the PLC display control cabinet is provided with an alarm light, the front side of the PLC display control cabinet is provided with a buzzer, the back side of the electronic pneumatic measuring instrument is provided with a power cord, the back side of the electronic pneumatic measuring instrument is provided with a transmission line, the back side of the electronic pneumatic measuring instrument is provided with an air intake pipe, and more After the rear sprocket hubs are processed, they are uniformly transferred to the vicinity of the bracket. Take one of the rear sprocket hubs. The bearing hole of the rear sprocket hub is sleeved on the side surface of the probe. The electronic pneumatic measuring instrument automatically detects the bearing hole of the rear sprocket hub. The electronic pneumatic measuring instrument transmits gas to the probe through the transmission tube and obtains feedback. The light column buoy points to the corresponding scale line. At the same time, the first display screen will display the detection data. The scale line is difficult to quickly identify. The words on the first display screen are too small to be quickly identified. The second display screen provides effective assistance and displays a larger "qualified" word. The larger "qualified" word is easy to identify. Rapid identification is carried out. The qualified rear sprocket hub is removed from the probe and placed in a special storage box, and then the detection of other rear sprocket hubs is continued. When some rear sprocket hubs are detected to be unqualified, the second display screen will automatically display the alarm word, and the alarm light will flash, and the buzzer will sound an alarm, which will attract the special attention of the operator, making it convenient to distinguish and deal with the unqualified rear sprocket hubs. The whole process increases the recognition feedback interface to improve recognition, save time and manpower, reduce visual fatigue, and has a warning reminder function to avoid misjudgment. The feedback ability is improved to ensure the quality of product inspection.

[0005] For further improvement, there are multiple buttons, multiple buttons below the first display screen, and multiple buttons are used to set the electronic pneumatic measuring instrument, which makes it convenient to view on the first display screen during the setting process.

[0006] For further improvement, the bracket is fixedly connected to the inner side with a supporting rod, there are multiple supporting rods, and a shelf is arranged on the top of the supporting rod. The multiple supporting rods increase the overall strength of the bracket, and the shelf is convenient for placing products or other items.

[0007] For further improvement, a foot pad is provided at the bottom of the bracket, and there are multiple foot pads, and the multiple foot pads are made of rubber or silicone material. The multiple foot pads provide effective protection while increasing the overall stability of the equipment, improving the grip ability and preventing the overall position of the equipment from moving.

[0008] To be further improved, a sub-frame is installed on the top of the base plate, a mini cylinder is arranged on the top of the sub-frame, the mini cylinder moves downward, a marking needle is arranged at the bottom of the mini cylinder, a solenoid valve is installed on the top of the base plate, the air intake pipe is connected to the solenoid valve, a plurality of transmission pipes are arranged on the top of the solenoid valve, the plurality of transmission pipes are respectively connected to the double-rod cylinder and the mini cylinder, the solenoid valve, the double-rod cylinder and the mini cylinder are respectively connected to the PLC display control cabinet by means of transmission lines, the PLC display control cabinet controls the extension operation of the double-rod cylinder, the piston rod of the double-rod cylinder drives the moving plate, the support block, the probe and the rear sprocket hub to move synchronously, the rear sprocket hub reaches the inner side of the sub-frame, the PLC display control cabinet controls the mini cylinder, the mini cylinder extends and runs quickly, the piston rod of the mini cylinder drives the marking needle to move downward and pop out, the marking needle acts on the rear sprocket hub and leaves a mark, so as to realize the dot marking on the product and increase the identification function, which is convenient for the operators to handle, store and transport the qualified products.

[0009] To further improve, a limiting protrusion is provided on the top of the double-rod cylinder, and a limiting groove is provided on the bottom of the movable plate. The limiting protrusion reaches the inside of the limiting groove. The limiting protrusion interacts with the limiting groove so that the movable plate moves according to a prescribed path, thereby improving the stability and accuracy of the movement process of the rear sprocket hub and ensuring that the marking needle accurately acts on the appropriate position on the rear sprocket hub.

[0010] For further improvement, a chute is installed on the side of the bracket, a defective product box is set under the chute, the rear sprocket hub passes through the chute to reach the inside of the defective product box, a proximity switch is installed on the side of the chute, the side of the proximity switch is connected to the transmission line, the transmission line is connected to the PLC display control cabinet, and the unqualified rear sprocket hub is removed from the probe and placed on the top of the chute, the unqualified rear sprocket hub slides on the chute and falls into the defective product box, the proximity switch effectively detects the passing rear sprocket hub, the proximity switch transmits information through the transmission line to the PLC display control cabinet, the PLC display control cabinet returns to its original state, the alarm light and the buzzer stop running, and it is convenient for continued detection of other rear sprocket hubs.

[0011] For further improvement, the side of the defective product box reaches the inside of the bracket, and the side of the chute is provided with rounded corners. The defective product box is under the chute and inside the bracket, which saves space while providing effective protection and reducing the impact of external forces on the defective product box. The rounded corners prevent sharp right-angle edges from causing direct harm to operators, thereby improving the comfort of the operation process.

[0012] To be further improved, a first connecting frame is fixedly connected to the bottom of the chute, a second connecting frame is fixedly connected to the bottom of the chute, a fixing bolt is arranged on the side of the first connecting frame, a first through hole is opened inside the first connecting frame, a second through hole is opened inside the bracket, a nut is arranged on the inside of the bracket, the fixing bolt passes through the first through hole and the second through hole in sequence and is threadedly connected with the nut, a fixing bolt is also arranged on the side of the second connecting frame, the second connecting frame has a first through hole, and the support rod has a second through hole, the chute is installed with the help of the first connecting frame, the second connecting frame, the fixing bolt, the first through hole, the second through hole, the bracket and the nut, the loading and unloading is easy and the operation is simple, and the chute is convenient to replace and adjust.

[0013] For further improvement, there are multiple fixing bolts, and the first connecting frame and the second connecting frame are respectively provided with two fixing bolts. The two fixing bolts increase the connection strength of the first connecting frame, and the two fixing bolts increase the second connecting frame, thereby further improving the strength and stability of the chute.

[0014] The beneficial effects of the present invention are:

[0015] 1. After processing multiple rear sprocket hubs, they are uniformly transferred to the vicinity of the bracket. Take one of the rear sprocket hubs. The bearing hole of the rear sprocket hub is sleeved on the side surface of the probe. The electronic pneumatic measuring instrument automatically detects the bearing hole of the rear sprocket hub. The electronic pneumatic measuring instrument transmits gas to the probe through the transmission tube and obtains feedback. The light column buoy points to the corresponding scale line. At the same time, the first display screen will display the test data. The scale line is difficult to quickly identify. The words on the first display screen are too small to be quickly identified. The second display screen provides effective assistance and displays a larger qualified word. The larger qualified word is easy to identify. It is easy to quickly identify. After the qualified rear sprocket hub is removed from the probe, it is placed in a special storage box, and then the detection of other rear sprocket hubs is continued. When some rear sprocket hubs are detected to be unqualified, the second display screen will automatically display the alarm word, and the alarm light will flash, and the buzzer will sound an alarm, which will attract the special attention of the operator, making it convenient to distinguish and otherwise deal with the unqualified rear sprocket hub. The whole process increases the recognition feedback interface to improve recognition, save time and manpower, reduce visual fatigue, and has a warning reminder function to avoid misjudgment. The feedback capability is improved to ensure product inspection quality.

[0016] 2. The double-rod cylinder is extended and operated by the PLC display control cabinet. The piston rod of the double-rod cylinder drives the moving plate, the support block, the probe and the rear sprocket hub to move synchronously. The rear sprocket hub reaches the inner side of the sub-frame. The PLC display control cabinet controls the mini cylinder. The mini cylinder extends and operates quickly. The piston rod of the mini cylinder drives the marking needle to move downward and pop out. The marking needle acts on the rear sprocket hub and leaves a mark, realizing the dot marking on the product to increase the identification function, which is convenient for operators to handle, store and transport qualified products. The interaction between the limiting protrusion and the limiting groove enables the moving plate to move along the specified path, improves the stability and accuracy of the movement process of the rear sprocket hub, and ensures that the marking needle accurately acts on the appropriate position on the rear sprocket hub.

[0017] 3. After the unqualified rear sprocket hub is detected, it is removed from the probe and placed on the top of the chute. The unqualified rear sprocket hub slides on the chute and falls into the defective product box. The proximity switch effectively detects the passing rear sprocket hub. The proximity switch transmits information to the PLC display control cabinet through the transmission line. The PLC display control cabinet restores to its original state, and the alarm light and buzzer stop running, which is convenient for continued detection of other rear sprocket hubs. The defective product box is under the chute and inside the bracket, which saves space and provides effective protection, reduces the impact of external forces on the defective product box, and the rounded corners are set to avoid direct harm to operators caused by sharp right-angle edges, thereby improving the comfort of the operation process.

[0018] 4. A first through hole is opened through the second connecting frame, a second through hole is opened through the support rod, and the chute is installed with the help of the first connecting frame, the second connecting frame, fixing bolts, the first through hole, the second through hole, the bracket and nuts. The loading and unloading are easy and the operation is simple. The chute is convenient for replacement and adjustment. Two fixing bolts increase the connection strength of the first connecting frame, and two fixing bolts increase the second connecting frame, thereby further improving the strength and stability of the chute. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 A bottom view of a rear sprocket hub of the present invention;

[0022] Figure 4 For the present invention Figure 1 Enlarged view of point B in the middle;

[0023] Figure 5 This is a diagram showing the installation of the first connecting frame of the present invention;

[0024] Figure 6This is a diagram showing the installation of the second connecting frame of the present invention;

[0025] Figure 7 It is a front view of the structure of the present invention;

[0026] Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle;

[0027] Fig. 9 For the present invention Figure 7 Enlarged view of point D in the middle;

[0028] Fig.10 It is a back view showing the structure of the present invention;

[0029] Fig.11 It is a diagram showing the operation of the double-rod cylinder of the present invention;

[0030] Fig.12 For the present invention Fig.11 Enlarged view of point E in the middle;

[0031] Fig.13 For the present invention Fig.11 Enlarged view of point F in the middle.

[0032] Description of reference numerals: 1. operating table; 2. bottom plate; 3. electronic pneumatic measuring instrument; 4. measuring head; 5. bracket; 6. PLC display control cabinet; 7. double-rod cylinder; 8. moving plate; 9. support block; 10. rear sprocket hub; 11. bearing hole; 12. transmission tube; 13. scale line; 14. light column buoy; 15. first display screen; 16. button; 17. second display screen; 18. alarm light; 19. buzzer; 20. power cord; 2 1. Transmission line; 22. Air intake pipe; 23. Support rod; 24. Shelf; 25. Foot pad; 26. Sub-frame; 27. Mini cylinder; 28. Marking needle; 29. ​​Solenoid valve; 30. Limiting bump; 31. Limiting groove; 32. Chute; 33. Defective product box; 34. Proximity switch; 35. Fillet; 36. First connecting frame; 37. Second connecting frame; 38. Fixing bolt; 39. First through hole; 40. Second through hole; 41. Nut. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-13 This embodiment is further described:

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.13As shown: In this embodiment, an automatic detection device for the bearing hole of a rear sprocket hub is provided, comprising an operating table 1, a base plate 2, an electronic pneumatic measuring instrument 3 and a probe 4, the electronic pneumatic measuring instrument 3 is mounted on the top of the base plate 2, the base plate 2 is arranged on the top of the operating table 1, a bracket 5 is arranged at the bottom of the operating table 1, a PLC display control cabinet 6 is installed on the top of the electronic pneumatic measuring instrument 3, a double-rod cylinder 7 is installed on the top of the base plate 2, a movable plate 8 is installed on the top of the double-rod cylinder 7, a support block 9 is arranged on the top of the movable plate 8, the probe 4 is installed on the top of the support block 9, a rear sprocket hub 10 is arranged on the top of the probe 4, a bearing hole 11 is opened inside the rear sprocket hub 10, the bearing hole 11 is sleeved on the side surface of the probe 4, a transmission tube 12 is arranged on the front side of the electronic pneumatic measuring instrument 3, the end of the transmission tube 12 is connected to the probe 4, a scale line 13 is arranged on the front side of the electronic pneumatic measuring instrument 3, and the electronic A light column buoy 14 is arranged on the front side of the electronic pneumatic measuring instrument 3, a first display screen 15 is arranged on the front side of the electronic pneumatic measuring instrument 3, a button 16 is arranged on the front side of the electronic pneumatic measuring instrument 3, a second display screen 17 is arranged on the front side of the PLC display control cabinet 6, an alarm light 18 is arranged on the front side of the PLC display control cabinet 6, a buzzer 19 is arranged on the front side of the PLC display control cabinet 6, a power cord 20 is arranged on the back side of the electronic pneumatic measuring instrument 3, a transmission line 21 is arranged on the back side of the electronic pneumatic measuring instrument 3, an air intake pipe 22 is arranged on the back side of the electronic pneumatic measuring instrument 3, there are multiple buttons 16, and the multiple buttons 16 are below the first display screen 15, a support rod 23 is fixedly connected to the inner side of the bracket 5, there are multiple support rods 23, a shelf 24 is arranged on the top of the support rod 23, and a foot pad 25 is arranged on the bottom of the bracket 5, there are multiple foot pads 25, and the multiple foot pads 25 are made of rubber or silicone material.

[0035] like Figure 2 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.12 and Fig.13 As shown: a sub-frame 26 is installed on the top of the base plate 2, a mini cylinder 27 is arranged on the top of the sub-frame 26, the mini cylinder 27 moves downward, a marking needle 28 is arranged at the bottom of the mini cylinder 27, a solenoid valve 29 is installed on the top of the base plate 2, the air intake pipe 22 is connected to the solenoid valve 29, a plurality of transmission pipes 12 are arranged on the top of the solenoid valve 29, and the plurality of transmission pipes 12 are respectively connected to the double-rod cylinder 7 and the mini cylinder 27, the solenoid valve 29, the double-rod cylinder 7 and the mini cylinder 27 are respectively connected to the PLC display control cabinet 6 by means of the transmission line 21, a limiting protrusion 30 is arranged on the top of the double-rod cylinder 7, a limiting groove 31 is arranged at the bottom of the movable plate 8, and the limiting protrusion 30 reaches the inside of the limiting groove 31.

[0036] like Figure 1 , Figure 4 , Figure 7 , Fig.10 and Fig.11As shown: a chute 32 is installed on the side of the bracket 5, a defective product box 33 is set below the chute 32, the rear sprocket hub 10 passes through the chute 32 to reach the inside of the defective product box 33, a proximity switch 34 is installed on the side of the chute 32, the side of the proximity switch 34 is connected to the transmission line 21, the transmission line 21 is connected to the PLC display control cabinet 6, the side of the defective product box 33 reaches the inside of the bracket 5, and a rounded corner 35 is set on the side of the chute 32.

[0037] like Figure 4 , Figure 5 , Figure 6 , Figure 7 and Fig.11 As shown: a first connecting frame 36 is fixedly connected to the bottom of the chute 32, a second connecting frame 37 is fixedly connected to the bottom of the chute 32, a fixing bolt 38 is arranged on the side of the first connecting frame 36, a first through hole 39 is opened inside the first connecting frame 36, a second through hole 40 is opened inside the bracket 5, a nut 41 is arranged on the inner side of the bracket 5, the fixing bolt 38 passes through the first through hole 39 and the second through hole 40 in sequence and is threadedly connected with the nut 41, a fixing bolt 38 is also arranged on the side of the second connecting frame 37, there are multiple fixing bolts 38, and two fixing bolts 38 are arranged on the first connecting frame 36 and the second connecting frame 37 respectively.

[0038] When the present invention is in use: the integral part of the chute 32 is transported to the side of the bracket 5, the first connecting frame 36 corresponds to the bracket 5, the second connecting frame 37 corresponds to the support rod 23, and a plurality of fixing bolts 38 are obtained, two of which pass through the first through hole 39 of the first connecting frame 36 and the second through hole 40 of the bracket 5 in sequence, and the other two fixing bolts 38 pass through the first through hole 39 of the second connecting frame 37 and the second through hole 40 of the support rod 23 in sequence, and a plurality of nuts 41 are obtained to be threadedly connected with the fixing bolts 38, and all the fixing bolts 38 are tightened to realize the installation and fixation of the first connecting frame 36 and the second connecting frame 37, and the installation and fixation of the chute 32 is realized, and the transmission line 21 on the side of the proximity switch 34 is connected to the PLC display control cabinet 6, and a plurality of rear chains are connected. After the wheel hub 10 is processed, it is uniformly transferred to the vicinity of the bracket 5, and one of the rear sprocket hubs 10 is taken. The bearing hole 11 of the rear sprocket hub 10 is sleeved on the side surface of the probe 4. The electronic pneumatic measuring instrument 3 automatically detects the bearing hole 11 of the rear sprocket hub 10. The electronic pneumatic measuring instrument 3 transmits gas to the probe 4 through the transmission tube 12 and obtains feedback. The light column buoy 14 points to the corresponding scale line 13. At the same time, the first display screen 15 will display the detection data. The scale line 13 is difficult to be quickly identified. The words on the first display screen 15 are too small to be quickly identified. The second display screen 17 provides effective assistance and displays a larger word "qualified". The larger word "qualified" is easy to be quickly identified. Then the PLC display control cabinet 6 controls the double-rod cylinder 7 to extend. The piston rod of the double-rod cylinder 7 drives the moving plate 8, the supporting block 9, the measuring head 4 and the rear sprocket hub 10 to move synchronously, and the rear sprocket hub 10 reaches the inner side of the sub-frame 26. The limiting protrusion 30 interacts with the limiting groove 31 to make the moving plate 8 move along the prescribed path, thereby improving the stability and accuracy of the movement process of the rear sprocket hub 10. The PLC display control cabinet 6 controls the mini cylinder 27, and the mini cylinder 27 extends and runs quickly. The piston rod of the mini cylinder 27 drives the marking needle 28 to move downward and pop out, and the marking needle 28 acts on the rear sprocket hub 10 and leaves a mark, thereby realizing the dot marking on the product and increasing the identification function. The double-rod cylinder 7 retracts and drives the moving plate 8, the supporting block 9, the measuring head 4 and the rear sprocket hub 10 to return to their original positions, and the qualified rear The sprocket hub 10 is removed from the probe 4 and placed in a special storage box, and then the detection of other rear sprocket hubs 10 is continued. When some rear sprocket hubs 10 are detected to be unqualified, the second display screen 17 will automatically display the alarm word, and the alarm light 18 will flash, and the buzzer 19 will sound an alarm, which will attract the special attention of the operator, and facilitate the distinction and other processing of the unqualified rear sprocket hub 10. The unqualified rear sprocket hub 10 is removed from the probe 4 and placed on the top of the chute 32. The unqualified rear sprocket hub 10 slides on the chute 32 and falls into the defective product box 33. The proximity switch 34 effectively detects the passing rear sprocket hub 10, and the proximity switch 34 transmits information through the transmission line 21 to the PLC display control cabinet 6.The PLC display control cabinet 6 is restored to its original state, and the alarm light 18 and buzzer 19 stop running, which is convenient for the continued detection of other rear sprocket hubs 10. The rear sprocket hub 10 does not pass through the chute 32, and the proximity switch 34 cannot be detected. The PLC display control cabinet 6 cannot be restored to its original state, and the alarm light 18 and buzzer 19 will not stop. The entire equipment cannot continue to be used normally, achieving the error-proofing design function. The defective product box 33 is below the chute 32 and inside the bracket 5, saving space while providing effective protection, reducing the impact of external forces on the defective product box 33, and the setting of the rounded corner 35 avoids direct harm to the operator by sharp right-angle edges, improving the comfort of the operation process, and increasing the recognition feedback interface throughout the process to improve recognition, saving time and manpower and reducing visual fatigue. It has a warning reminder function to avoid misjudgment, and the feedback ability is improved to ensure product inspection quality.

[0039] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. An automatic detection device for a rear sprocket hub bearing hole, comprising an operating table (1), a base plate (2), an electronic pneumatic measuring instrument (3) and a probe (4), wherein: The electronic pneumatic measuring instrument (3) is installed on the top of the base plate (2), the base plate (2) is arranged on the top of the operating table (1), a bracket (5) is arranged at the bottom of the operating table (1), a PLC display control cabinet (6) is installed on the top of the electronic pneumatic measuring instrument (3), a double-rod cylinder (7) is installed on the top of the base plate (2), a moving plate (8) is installed on the top of the double-rod cylinder (7), a supporting block (9) is arranged on the top of the moving plate (8), a probe (4) is installed on the top of the supporting block (9), a rear sprocket hub (10) is arranged on the top of the probe (4), a bearing hole (11) is opened inside the rear sprocket hub (10), the bearing hole (11) is sleeved on the side surface of the probe (4), a transmission pipe (12) is arranged on the front side of the electronic pneumatic measuring instrument (3), and the transmission pipe (12) ) end is connected to the measuring head (4), a scale line (13) is arranged on the front side of the electronic pneumatic measuring instrument (3), a light column buoy (14) is arranged on the front side of the electronic pneumatic measuring instrument (3), a first display screen (15) is arranged on the front side of the electronic pneumatic measuring instrument (3), a button (16) is arranged on the front side of the electronic pneumatic measuring instrument (3), a second display screen (17) is arranged on the front side of the PLC display control cabinet (6), an alarm light (18) is arranged on the front side of the PLC display control cabinet (6), a buzzer (19) is arranged on the front side of the PLC display control cabinet (6), a power cord (20) is arranged on the back side of the electronic pneumatic measuring instrument (3), a transmission line (21) is arranged on the back side of the electronic pneumatic measuring instrument (3), and an air intake pipe (22) is arranged on the back side of the electronic pneumatic measuring instrument (3).

2. The rear sprocket hub bearing hole automatic detection device according to claim 1 is characterized in that: There are a plurality of buttons (16), and the plurality of buttons (16) are located below the first display screen (15).

3. The rear sprocket hub bearing hole automatic detection device according to claim 1 is characterized by: A support rod (23) is fixedly connected to the inner side of the bracket (5), there are a plurality of support rods (23), and a shelf (24) is arranged on the top of the support rod (23).

4. The rear sprocket hub bearing hole automatic detection device according to claim 1 is characterized by: A foot pad (25) is arranged at the bottom of the bracket (5), and there are a plurality of foot pads (25), and the plurality of foot pads (25) are made of rubber material or silicone material.

5. The rear sprocket hub bearing hole automatic detection device according to claim 1 is characterized by: A sub-frame (26) is installed on the top of the base plate (2), a mini cylinder (27) is arranged on the top of the sub-frame (26), the mini cylinder (27) moves downward, a marking needle (28) is arranged at the bottom of the mini cylinder (27), a solenoid valve (29) is installed on the top of the base plate (2), an air intake pipe (22) is connected to the solenoid valve (29), a plurality of transmission pipes (12) are arranged on the top of the solenoid valve (29), the plurality of transmission pipes (12) are respectively connected to the double-rod cylinder (7) and the mini cylinder (27), and the solenoid valve (29), the double-rod cylinder (7) and the mini cylinder (27) are respectively connected to the PLC display control cabinet (6) by means of a transmission line (21).

6. The rear sprocket hub bearing hole automatic detection device according to claim 1, characterized in that: A limiting convex block (30) is arranged on the top of the double-rod cylinder (7), and a limiting groove (31) is arranged on the bottom of the movable plate (8), and the limiting convex block (30) reaches the inside of the limiting groove (31).

7. The rear sprocket hub bearing hole automatic detection device according to claim 1 is characterized by: A chute (32) is installed on the side of the bracket (5), a defective product box (33) is arranged below the chute (32), the rear sprocket hub (10) passes through the chute (32) to reach the inside of the defective product box (33), a proximity switch (34) is installed on the side of the chute (32), the side of the proximity switch (34) is connected to a transmission line (21), and the transmission line (21) is connected to a PLC display control cabinet (6).

8. The rear sprocket hub bearing hole automatic detection device according to claim 7 is characterized by: The side of the defective product box (33) reaches the inside of the bracket (5), and the side of the chute (32) is provided with a rounded corner (35).

9. The rear sprocket hub bearing hole automatic detection device according to claim 7, characterized in that: The bottom of the chute (32) is fixedly connected with a first connecting frame (36), the bottom of the chute (32) is fixedly connected with a second connecting frame (37), a fixing bolt (38) is arranged on the side of the first connecting frame (36), a first through hole (39) is opened inside the first connecting frame (36), a second through hole (40) is opened inside the bracket (5), a nut (41) is arranged on the inner side of the bracket (5), the fixing bolt (38) passes through the first through hole (39) and the second through hole (40) in sequence and is threadedly connected with the nut (41), and a fixing bolt (38) is also arranged on the side of the second connecting frame (37).

10. The rear sprocket hub bearing hole automatic detection device according to claim 9, characterized in that: There are a plurality of fixing bolts (38), and two fixing bolts (38) are respectively provided on the first connecting frame (36) and the second connecting frame (37).

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