Automatic detection equipment for bushings

Abstract

The present application relates to the technical field of bush detection, and particularly relates to a bush automatic detection equipment, which comprises a base, a support and a bush body, and further comprises: a conveying pipeline and a vibrating disc, the conveying pipeline and the vibrating disc are communicated at a discharge port; a fixed plate is arranged on the surface of the support; a moving block is slidingly connected to the surface of the fixed plate and located at the end of the conveying pipeline, the surface of the moving block is provided with a connecting shaft, and the surface of the connecting shaft is provided with an inner diameter detection module and a length detection module near the top end. The conveying pipeline and the connecting shaft are cooperated, the bush slides along the pipeline under the action of gravity and is accurately sleeved on the connecting shaft, the seamless connection of the detection process and the material transmission is realized, the high-precision inner diameter detection module and the length detection module integrated on the surface of the connecting shaft are started synchronously in the sleeving movement process of the bush, and the problems of measurement blind area and data dispersion existing in the traditional detection mode are successfully overcome.

Description

Technical Field

[0001] This invention relates to the field of bushing inspection technology, and in particular to an automatic bushing inspection device. Background Technology

[0002] A bushing is a mechanical part used in mechanical transmission. It is usually cylindrical with a certain wall thickness. Its inner hole fits with the shaft, and its outer diameter fits with other components (such as bearing housings, housings, etc.). Its surface usually requires high machining accuracy and surface finish to ensure a good fit with the shaft and other components. The bushing supports the shaft, enabling it to rotate stably in a certain position, while ensuring the relative positional accuracy between the shaft and other components, thus ensuring the accuracy of mechanical transmission.

[0003] Traditional bushing inspection equipment generally uses a contact-type two-point measurement method to detect the inner diameter and length. This method not only has measurement blind spots, making it difficult to cover the full size range of the bushing, but also has large data dispersion, resulting in low detection accuracy and failing to meet the quality control requirements of high-precision bushings. In the appearance inspection stage, existing technologies mostly rely on manual visual inspection or fixed-angle camera inspection, which cannot perform 360° scanning of the bushing surface without blind spots. This easily leads to the omission of minute defects and scratches, causing defective products to enter the production process. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic bushing inspection device that solves the problems of poor bushing inspection accuracy and blind spots.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic bushing inspection device includes a base, a bracket, and a bushing body, and further includes:

[0007] A conveying pipe and a vibratory feeder, wherein the conveying pipe and the vibratory feeder's discharge port are connected;

[0008] A fixing plate is mounted on the surface of the bracket;

[0009] A movable block is slidably connected to the surface of a fixed plate and located at the end of a conveying pipe. A connecting shaft is provided on the surface of the movable block. An inner diameter detection module and a length detection module are provided on the surface of the connecting shaft near the top. An appearance detection module is provided on the surface of the movable block.

[0010] Preferably, the diameter of the connecting shaft is smaller than the inner diameter of the bushing body.

[0011] Preferably, the top of the movable block has a notch, the depth of which is adapted to the length of the bushing body, the connecting shaft is located at the notch, and the appearance detection module is located on the side wall of the notch.

[0012] Preferably, the connecting shaft and the inner hole of the conveying pipe are coaxial.

[0013] Preferably, the movable block is equipped with a motor for driving the connecting shaft to rotate.

[0014] A first electric push rod is fixedly installed inside the movable block, and a mounting shell is fixedly installed at the output end of the first electric push rod. The side wall of the mounting shell is slidably connected to the inner wall of the movable block.

[0015] The surface of the connecting shaft is fitted with an annular connecting disc, which is rotatably connected to the moving block. The surface of the connecting shaft has four vertical grooves, and the inner wall of the connecting disc has four protrusions corresponding to the positions of the four vertical grooves of the connecting shaft. The connecting shaft and the connecting disc are slidably connected through the protrusions and the vertical grooves, and the connecting shaft drives the connecting disc to rotate synchronously through the protrusions.

[0016] The surface of the connecting shaft has four long grooves, and the inside of the long grooves is a strip-shaped airbag. The bottom ends of the four strip-shaped airbags are connected to a connector. The inside of the moving block is an air pump, and the air outlet of the air pump is connected to a hose. The other end of the hose is connected to the connector.

[0017] A second electric push rod is fixedly installed on the surface of the fixed plate, and the free end of the second electric push rod is fixedly connected to the moving block.

[0018] It also includes a controller, which is electrically connected to the vibratory feeder, motor, first electric push rod, second electric push rod, air pump, inner diameter detection module, length detection module, and appearance inspection module.

[0019] This invention has at least the following beneficial effects:

[0020] Through the collaborative structure of the conveying pipeline and the connecting shaft, the bushing slides down the pipeline under the action of gravity and is precisely fitted into the connecting shaft, realizing a seamless connection between the detection process and material transmission. The high-precision inner diameter detection module and the length detection module integrated on the surface of the connecting shaft are activated simultaneously during the bushing fitting process. The former is based on a miniature laser triangular displacement sensor and performs a 360° dynamic scan of the inner diameter with a detection accuracy of ±0.1μm; the latter uses an ultra-small capacitive displacement sensor to continuously monitor the entire length of the bushing with a measurement accuracy of ±0.01mm, successfully overcoming the measurement blind spots and data dispersion problems existing in traditional detection methods.

[0021] After the bushing body is fully fitted onto the connecting shaft, the first motor can drive the connecting shaft to rotate the bushing body. The bushing maintains a stable posture during rotation. In conjunction with the miniature area array CCD camera arranged on the side wall of the moving block notch, a 360° full-coverage dynamic scan of the bushing surface can be achieved, completely eliminating the visual blind spots of traditional inspection methods. This ensures that minor flaws, scratches, and other defects on the bushing surface can be accurately identified, greatly improving the integrity and reliability of appearance inspection and effectively guaranteeing the appearance quality standards of bushing products.

[0022] The integrated moving block highly integrates the three major inspection modules: inner diameter, length, and appearance. After inspection, the moving block can move laterally, simultaneously achieving two functions: First, it uses preset sorting logic to transfer qualified and unqualified bushings to their corresponding collection boxes, improving efficiency compared to traditional sorting methods. Second, using the top position of the moving block, it automatically blocks pipeline transport during movement, forming a dynamic interception barrier to avoid timing conflicts between bushing transport and sorting operations. This three-in-one collaborative design of "inspection-sorting-blocking" realizes fully automated closed-loop management of the bushing inspection process, effectively reducing equipment space occupation and improving the smoothness and reliability of system operation.

[0023] After the bushing body is fitted onto the connecting shaft, it can be made coaxial with the connecting shaft using a strip-shaped airbag, significantly improving the bushing inspection efficiency and ensuring high accuracy and stability in inner diameter and length detection. Moreover, the strip-shaped airbag forms a flexible buffer layer to avoid surface damage during the inspection process. Through the frictional force generated by the inflation, the airbag drives the bushing to rotate synchronously, which helps with appearance inspection. Furthermore, by adjusting the air pressure, it can be adapted to various bushing specifications with inner diameters of 0-5mm, improving the equipment's versatility and effectively reducing enterprise equipment investment and maintenance costs. It provides an efficient, reliable, and economical solution for automated bushing inspection. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 For the present invention Figure 1 Side view;

[0027] Figure 3 This is a schematic diagram of the conveying pipeline structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the fixing plate structure of the present invention;

[0029] Figure 5 This is a cross-sectional view of the movable block of the present invention;

[0030] Figure 6 This is a schematic diagram of the connecting shaft structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the strip-shaped airbag structure of the present invention;

[0032] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point A in the middle;

[0033] Figure 9 This is a schematic diagram of the connector structure of the present invention.

[0034] In the diagram: 1. Base; 2. Bracket; 3. Controller; 4. Vibratory feeder; 5. Conveying pipe; 6. Collection frame; 7. Fixing plate; 8. Moving block; 9. Bushing body; 10. Connecting shaft; 101. Long groove; 11. Motor; 12. Mounting shell; 13. First electric push rod; 14. Strip-shaped airbag; 15. Hose; 16. Air pump; 17. Connector; 171. First annular connecting shell; 172. Second annular connecting shell; 18. Inner diameter detection module; 19. Length detection module; 20. Appearance inspection module; 21. Connecting plate; 22. Second electric push rod. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] Reference Figure 1-9An automatic bushing detection device includes a base 1, a support 2, and a bushing body 9. It also includes a conveying pipe 5 and a vibrating plate 4. The vibrating plate 4, through its own vibration and rotation, orderly feeds the bushing body 9 into the conveying pipe 5, which is connected to its discharge port. The conveying pipe 5 is inclined. Under the action of gravity, the bushing body 9 automatically slides down the inner wall of the conveying pipe 5 to achieve uniform conveying and finally reaches the end of the conveying pipe 5. The vibrating plate 4 is an electromagnetic vibrating plate of model V100-2 with a vibration frequency range of 50-200Hz. The rotation speed is adjusted by a frequency converter with an adjustment range of 0-100rpm. The conveying pipe 5 is made of stainless steel with an inner wall roughness Ra≤0.8μm and an inclination angle of 30°±2°. The bracket 2 is fixed to the surface of the base 1 to fix the conveying pipe 5 and the fixing plate 7. The conveying pipe 5 is connected to the discharge port of the vibrating plate 4. A moving block 8 is slidably connected to the surface of the fixing plate 7. The moving block 8 is located at the end of the conveying pipe 5. A connecting shaft 10 is provided on the surface of the moving block 8. An inner diameter detection module 18 and a length detection module 19 are located near the top of the connecting shaft 10. An appearance inspection module 20 is provided on the surface of the moving block 8. As the bushing body 9 moves from the conveying pipe 5 onto the connecting shaft 10, the length detection module 19 can detect the length of the bushing body 9. The length detection module 19 uses a MIK-CPT105 ultra-small capacitive displacement sensor with a measurement accuracy of ±0.01mm, a range of 0-2mm, and a response time of 0.5 seconds. A rectangular mounting groove is milled on the surface of the connecting shaft 10 near the top and fixed with glue. The inner diameter detection module 18 can detect the inner diameter of the bushing body 9. During the detection process, the connecting shaft 10 is driven to rotate by the motor 11, so the inner diameter detection module 18 is also in a rotating state, thereby realizing all-round detection of the entire inner diameter and improving the detection coverage area. The inner diameter detection module 18 uses a miniature laser triangular displacement sensor of model LK-G5001V, with a measurement accuracy of ±0.1μm, a range of 0-5mm, and a response time of 1ms. The mounting groove is machined on the circumferential surface of the connecting shaft 10 near the top and fixed with epoxy resin. The length detection module 19 is triggered to start detection when the front face of the bushing body 9 is 5mm away from the sensing surface of the ultra-small capacitive displacement sensor. The detection ends after the capacitance value detected by the sensor stabilizes for 100ms when the bushing body 9 is fully fitted. The inner diameter detection module 18 starts synchronously when the bushing body 9 begins to fit the connecting shaft 10, and stops detection after the connecting shaft 10 rotates 3 times.

[0038] Furthermore, the diameter of the connecting shaft 10 is smaller than the inner diameter of the bushing body 9, the connecting shaft 10 and the inner hole of the conveying pipe 5 are coaxial, and the bushing body 9 can be automatically fitted onto the connecting shaft 10 after sliding out from the bottom end of the conveying pipe 5.

[0039] Furthermore, the top of the movable block 8 has a notch, the depth of which is greater than the length of the bushing body 9. After the bushing body 9 is completed, regardless of whether it passes inspection, the movable block 8 needs to move the bushing body 9 to the qualified or unqualified area before it can be removed. During this process, the movable block 8 can use its top position to directly block the bottom of the conveying pipe 5, preventing the bushing body 9 from moving further down. Only after the bushing body 9 is removed and the movable block 8 returns to its original position will the bushing body 9 in the conveying pipe 5 continue to move down. In other words, after inspection, the movable block 8 needs to move to a designated position to remove the inspected bushing body 9. When the device moves, it blocks the lowest end of the conveying pipe 5, preventing the bushing body 9 from falling until the connecting shaft 10 is aligned with the coaxial line of the conveying pipe 5. At this point, the moving block 8 no longer blocks the conveying pipe 5, and the bushing body 9 will fall. The connecting shaft 10 is positioned at the notch, and the appearance inspection module 20 is located on the side wall of the notch. The bushing body 9 is located on the surface of the connecting shaft 10 and is driven to rotate by the motor 11. The appearance inspection module 20 can inspect the outer wall of the rotating bushing body 9 from all directions. The appearance inspection module 20 uses a miniature area array CCD camera as the image acquisition device. It is small in size and has high image quality, which can meet the appearance inspection requirements of the bushing body 9. The miniature area array CCD camera is mounted on the side wall of the notch of the moving block 8. The camera is equipped with a miniature wide-angle lens to expand the field of view and avoid blind spots. Image transmission uses a high-speed serial interface to reduce the number of data lines, reduce wiring complexity, and improve data transmission efficiency. The image processing system is integrated inside the controller 3 and connected to the camera to receive and process image data.

[0040] Furthermore, a first electric push rod 13 is fixedly installed inside the movable block 8. A mounting shell 12 is fixedly installed at the output end of the first electric push rod 13. The side wall of the mounting shell 12 is slidably connected to the inner wall of the movable block 8, so that the first electric push rod 13 only serves to drive the movable block 8 to move. By setting the first electric push rod 13, after the bushing body 9 on the connecting shaft 10 has finished detection, the first electric push rod 13 drives the entire mounting shell 12, motor 11 and connecting shaft 10 to move toward the inside of the movable block 8, so that the connecting shaft 10 can be pulled out from the inner hole of the bushing body 9, and then the bushing body 9 will automatically fall into the inside of the collection frame 6. Then the first electric push rod 13 drives the connecting shaft 10 to extend again, which is convenient for reuse.

[0041] Furthermore, an annular connecting disc 21 is fitted onto the surface of the connecting shaft 10. The connecting disc 21 and the moving block 8 are rotatably connected. Four vertical grooves are formed on the surface of the connecting shaft 10. The inner wall of the connecting disc 21 is provided with four protrusions corresponding to the positions of the four vertical grooves of the connecting shaft 10. The connecting shaft 10 and the connecting disc 21 are slidably connected through the protrusions and the vertical grooves. The connecting shaft 10 drives the connecting disc 21 to rotate synchronously through the protrusions. The annular connecting disc 21 can rotate synchronously with the connecting shaft 10, but it will not retract into the interior of the moving block 8 with the connecting shaft 10. Therefore, when the bushing body 9 is fitted onto the surface of the connecting shaft 10, its bottom end will not directly contact the moving block 8, but will directly contact the connecting disc 21. This avoids friction between the bushing body 9 and the moving block 8 when the bushing body 9 rotates, thus protecting the bushing body 9.

[0042] Furthermore, four elongated grooves 101 are formed on the surface of the connecting shaft 10. Strip-shaped airbags 14 are disposed inside the grooves 101. The bottom ends of the four strip-shaped airbags 14 are connected to connectors 17. An air pump 16 is disposed inside the moving block 8. The air outlet of the air pump 16 is connected to a hose 15. The other end of the hose 15 is connected to connectors 17. Connector 17 includes a first annular connecting shell 171 and a second annular connecting shell 172. The first annular connecting shell 171 is fixed to the bottom end of the connecting shaft 10 and communicates with the four strip-shaped airbags 14. The annular connecting shell 172 is fixed to the top of the mounting shell 12 and communicates with the hose 15. The first annular connecting shell 171 and the second annular connecting shell 172 are both open on the side where they are connected, and the open ends are rotatably connected. Through the connecting piece 17, the connecting shaft 10 only drives the first annular connecting shell 171 to rotate synchronously. However, the second annular connecting shell 172 is fixed to the mounting shell 12 and therefore does not rotate. The first annular connecting shell 171 and the second annular connecting shell 172 can rotate together. Therefore, while ensuring the air pump 16 delivers air, it does not affect the rotation of the strip-shaped airbag 14 with the connecting shaft 10. Because the diameter of the connecting shaft 10 is smaller than that of the bushing body 9, the bushing body 9 remains in contact with the conveying pipe 5 during the process of sliding out of the conveying pipe 5. It only fits on the surface of the connecting shaft 10, maintaining coaxiality, but does not contact the connecting shaft 10. It only falls onto the connecting shaft 10 when it is completely detached from the conveying pipe 5. At this time, the inner diameter of the bushing body 9 is larger than that of the connecting shaft 10. Because of the diameter, the two will not remain on the same axis. Therefore, by inflating four strip-shaped airbags 14 at the same time, the bushing body 9 and the connecting shaft 10 are kept on the same axis. Moreover, after the strip-shaped airbags 14 come into contact with the bushing body 9, they can drive the bushing body 9 to rotate with the connecting shaft 10. During the rotation process, the bushing body 9 can be inspected from all directions by the appearance inspection module 20. The strip-shaped airbags 14 are made of silicone rubber with a thickness of 0.3mm. After inflation, the expansion diameter is 0.5-1mm larger than that of the connecting shaft 10, and the pressure resistance is 0.3MPa. The first annular connecting shell 171 and the second annular connecting shell 172 of the connector 17 are both made of stainless steel 304, with an inner diameter of 10mm and an outer diameter of 15mm. The rotating connection part uses a miniature ball bearing of model MR52, which is lubricated with molybdenum disulfide grease and sealed with a silicone ring. The air pump 16 inflates the strip air bag 14 at a pressure of 0.15MPa and the inflation time is 1.5 seconds. After the test is completed, the deflation is completed within 0.5 seconds after receiving the deflation command.

[0043] Furthermore, a second electric push rod 22 is fixedly installed on the surface of the fixed plate 7. The free end of the second electric push rod 22 is fixedly connected to the moving block 8. When any one of the appearance inspection module 20, length inspection module 19 and inner diameter inspection module 18 fails to meet the requirements, the second electric push rod 22 will push the entire moving block 8 to the position of the waste collection box 6. If all of them meet the requirements, it will move to the position of the good product collection box 6. When the moving block 8 moves, it will use its top position to block the conveying pipe 5, so that the bushing body 9 inside the conveying pipe 5 will not slide down.

[0044] In summary, the vibratory feeder 4 uses electromagnetic vibration and rotation to feed the bushing body 9 into the inclined stainless steel conveying pipe 5. When the bushing body 9 slides to the end, it begins to fit into the connecting shaft 10. At the moment of fitting, the inner diameter detection module 18 immediately starts and rotates with the connecting shaft 10 to scan the inner wall. The length detection module 19 triggers detection when the front end of the bushing body 9 is 5mm away from its sensing surface, and continues until 100ms after the fitting is stable. After the fitting is stable, the four silicone strip-shaped airbags 14 on the surface of the connecting shaft 10 are inflated synchronously to center the bushing body 9, and continue to rotate the connecting shaft 10. Thus, the appearance detection module 20 collects the outer wall image in real time as the bushing body 9 rotates. After the detection is completed, the moving block 8 moves to the designated area under the action of the second electric push rod 22. The strip-shaped airbags 14 depressurize within 0.5 seconds, and the first electric push rod 13 drives the connecting shaft 10 to be pulled away from the bushing body 9 to complete the unloading.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An automatic bushing inspection device, comprising a base (1), a bracket (2), and a bushing body (9), characterized in that, Also includes: The conveying pipe (5) and the vibrating plate (4) are connected at their outlets; A fixing plate (7) is set on the surface of the bracket (2); The movable block (8) is slidably connected to the surface of the fixed plate (7) and located at the end of the conveying pipe (5). The surface of the movable block (8) is provided with a connecting shaft (10). The surface of the connecting shaft (10) near the top is provided with an inner diameter detection module (18) and a length detection module (19). The surface of the movable block (8) is provided with an appearance detection module (20). The inner bore of the connecting shaft (10) and the conveying pipe (5) are coaxial; The movable block (8) is equipped with a motor (11) for driving the connecting shaft (10) to rotate. The first electric push rod (13) is fixedly installed inside the movable block (8), and the output end port of the first electric push rod (13) is fixedly installed with a mounting shell (12). The side wall of the mounting shell (12) and the inner wall of the movable block (8) are slidably connected. The surface of the connecting shaft (10) is fitted with an annular connecting disc (21). The connecting disc (21) and the moving block (8) are rotatably connected. The surface of the connecting shaft (10) is provided with four vertical grooves. The inner wall of the connecting disc (21) is provided with four protrusions corresponding to the positions of the four vertical grooves of the connecting shaft (10). The connecting shaft (10) and the connecting disc (21) are slidably connected through the protrusions and the vertical grooves, and the connecting shaft (10) drives the connecting disc (21) to rotate synchronously through the protrusions. The surface of the connecting shaft (10) is provided with four long grooves (101), and the inside of the long grooves (101) is provided with strip-shaped airbags (14). The bottom ends of the four strip-shaped airbags (14) are connected to the connectors (17). The inside of the moving block (8) is provided with an air pump (16). The air outlet of the air pump (16) is connected to a hose (15), and the other end of the hose (15) is connected to the connectors (17).

2. The automatic bushing inspection device according to claim 1, characterized in that, The diameter of the connecting shaft (10) is smaller than the inner diameter of the bushing body (9).

3. The automatic bushing inspection device according to claim 1, characterized in that, The top of the movable block (8) has a notch, the depth of which is greater than the length of the bushing body (9). The connecting shaft (10) is located at the notch, and the depth of the connecting shaft (10) is the same as that of the notch. The appearance detection module (20) is located on the side wall of the notch.

4. The automatic bushing inspection device according to claim 1, characterized in that, The surface of the fixed plate (7) is fixedly mounted with a second electric push rod (22), and the free end of the second electric push rod (22) is fixedly connected to the moving block (8).

5. The automatic bushing inspection device according to claim 4, characterized in that, It also includes a controller (3), which is electrically connected to the vibratory plate (4), the motor (11), the first electric push rod (13), the second electric push rod (22), the air pump (16), the inner diameter detection module (18), the length detection module (19), and the appearance detection module (20), respectively.

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