A comprehensive testing device for differential locks

Abstract

This application discloses a comprehensive testing device for differential locks, relating to the field of automotive powertrain testing technology. It improves upon the problems of cumbersome operation and inaccurate test results associated with manual differential lock testing. The device uses a conveyor line and a loading platform to transport the differential lock to a lifting assembly. A robotic transport assembly clamps the differential lock and moves it to a receiving platform, limiting the differential lock's outer casing. The test piece then moves down until a splined rod is inserted into the differential lock, connecting the splined rod to one of the half-shaft gears. A drive motor then drives the differential lock's outer casing, while a hysteresis brake provides a test load force, limiting the planetary gears within the differential lock. The results are detected by torque and pressure sensors, and the data is transmitted to a control system in the electrical cabinet for recording and analysis. After testing, the device is removed by the robotic transport assembly. The entire process eliminates the need for manual handling and testing, thus avoiding the cumbersome operation and inaccurate test results associated with manual differential lock testing.

Description

Technical Field

[0001] This application relates to the field of automotive powertrain testing technology, and in particular to a comprehensive testing device for differential locks. Background Technology

[0002] A differential lock is a differential with an automatic locking function. It mainly includes a housing, left / right half-shaft gears, two planetary gears, a drive shaft, and a coil. The function of a differential lock is to improve a vehicle's ability to traverse rough roads. Specifically, when one drive axle of the vehicle is spinning freely, it can quickly lock the differential, making the two drive axles rigidly connected.

[0003] With the continuous development of technology, differential locks are increasingly widely used in various car models from different manufacturers. For a qualified differential lock to function properly, it must first possess normal differential function; the left and right half-shaft gears should not jam or produce abnormal noises during differential movement, and there should be no excessive starting torque. Secondly, its locking mechanism must reliably lock within the set speed difference and quickly unlock when the unlocking conditions are met. Therefore, checking and verifying the functions of differential locks, especially the online inspection of products at the relevant manufacturing plants, is particularly important.

[0004] However, current testing of differential locks is generally conducted manually. During testing, the operator mounts the differential lock on a test bench and connects it to the testing equipment using a dedicated cable or plug. The operator then simulates vehicle operation under different driving conditions to check whether the differential lock can respond correctly and lock or unlock. Furthermore, the operator must record various test data and results of the differential lock, such as its response time, to evaluate its performance and reliability.

[0005] Among the aforementioned related technologies, the applicant believes that at least the following problems exist: the existing manual testing methods are not only cumbersome to operate, but also prone to errors during the manual testing process, resulting in inaccurate test results. Therefore, there is an urgent need to propose a comprehensive testing device for differential locks. Summary of the Invention

[0006] To address the issues of cumbersome manual testing of differential locks and inaccurate test results, this application provides a comprehensive testing device for differential locks.

[0007] This application provides a comprehensive testing device for differential locks, which adopts the following technical solution:

[0008] A differential lock comprehensive testing device includes a fence for safety protection, a conveyor line for transporting differential locks, a robot handling component, a testing machine component, and an NG placement table;

[0009] The two ends of the conveyor line are respectively connected to the fence. The conveyor line is horizontally slidably equipped with a loading platform. The loading platform is equipped with a material support for placing the differential lock. The material support is equipped with multiple limiting posts for the differential lock to be inserted. The conveyor line is equipped with a lifting component for lifting the loading platform.

[0010] The robot handling assembly includes a six-axis robot for handling differential locks, a mounting base disposed on the six-axis robot, and two grippers for holding differential locks. The grippers are movably disposed on the mounting base, and the mounting base is provided with pneumatic components for controlling the movement of the grippers.

[0011] The testing machine assembly includes a lower frame, a column mounted on the lower frame, a test piece mounted on the column, and a rotating component mounted on the lower frame. The test piece includes a sliding frame mounted on the column that moves vertically, a mounting frame and a connecting frame mounted on the sliding plate, a hysteresis brake and an electromagnetic brake mounted on the mounting frame, and a pressure sensor mounted on the connecting frame. The column is equipped with a control component for controlling the movement of the sliding frame. The connecting frame is located below the mounting frame. A torque sensor is mounted on the sliding frame between the electromagnetic brake and the pressure sensor. The hysteresis brake, electromagnetic brake, torque sensor, and pressure sensor are arranged sequentially from top to bottom, and the hysteresis brake, electromagnetic brake, and torque sensor are coaxially connected.

[0012] The connecting frame is provided with a clamping member for holding the differential lock, and the connecting frame is provided with a spline rod for connecting the differential lock below the pressure sensor. The spline rod is coaxially arranged with the torque sensor.

[0013] The rotating component includes a fixed base mounted on the lower frame, a receiving platform rotatably connected to the fixed base, a drive motor for driving the receiving platform to rotate, and positioning columns mounted on the receiving platform. The positioning columns are used to position the differential lock. There are multiple positioning columns, which are slidably connected to the receiving platform. The receiving platform is equipped with a control component for controlling the movement of the positioning columns.

[0014] Preferably, the control component includes an active rod and an operating rod rotatably disposed within the receiving platform, a driven rod, an active bevel gear coaxially disposed at both ends of the active rod, a driven bevel gear coaxially disposed at one end of the driven rod, a pushing bevel gear coaxially disposed at one end of the operating rod, and a slider threadedly connected to the driven rod. The number of driven rods is the same as the number of positioning pins, and the multiple driven rods are spaced apart circumferentially. The slider is horizontally slidably connected to the receiving platform, and the positioning pins are connected to the slider. The axial directions of the active rod and the driven rod are perpendicular to each other. One end of the operating rod extends to the outer wall of the receiving platform, and a fixing member is provided between the operating rod and the receiving platform. The pushing bevel gear meshes with the active bevel gear located at the bottom of the active rod, and the active bevel gear meshes with the driven bevel gear.

[0015] Preferably, the connecting frame includes a fixed block mounted on the sliding frame and connecting seats disposed on both sides of the fixed block. The fixed block is rotatably connected to a rotating rod for mounting the spline rod, and the rotating rod is coaxially arranged with the spline rod. The fixed block is provided with a mounting sleeve, the rotating rod is coaxially arranged with the mounting sleeve and the rotating rod passes through the mounting sleeve. The rotating rod is coaxially provided with a fixed bushing for mounting the spline rod, and the fixed bushing is provided with a fixing bolt passing through the spline rod.

[0016] Preferably, the spline rod is coaxially provided with a fixing rod, and the bottom end of the rotating rod is provided with a fixing groove for the fixing rod to be inserted. The cross-section of the fixing rod is polygonal, and the fixing rod and the fixing groove are compatible.

[0017] Preferably, the clamping component includes a clamping block that is horizontally slidably disposed below the connecting seat, a clamping cylinder for pushing the clamping block to move, the piston rod of the clamping cylinder being fixed to the clamping component, and the pressure sensor being disposed at the clamping block.

[0018] Preferably, the clamping block has a toothed block for abutting the differential lock on the side away from the clamping cylinder.

[0019] Preferably, the lifting assembly includes a fixed frame disposed on the conveyor line, a lifting cylinder disposed on the fixed frame, and a lifting plate for lifting the loading platform completely detached from the conveyor line. The piston rod of the lifting cylinder is connected to the lifting plate, and the lifting plate is always located between the loading platform and the fixed frame.

[0020] Preferably, the pneumatic component is a clamping cylinder mounted on the mounting base. The number of clamping cylinders is the same as the number of grippers, and one clamping cylinder corresponds to one gripper. The gripper is provided with a lifting plate for lifting the differential lock.

[0021] In summary, this application includes at least one of the following beneficial effects:

[0022] 1. During testing, the conveyor line and loading platform transport the differential lock under test to the lifting assembly. The lifting cylinder and lifting plate raise the loading platform until it is completely detached from the conveyor line. A six-axis robot and grippers then hold the differential lock and move it to the receiving platform. The positioning pin is inserted into the bottom hole of the differential lock. Next, the controller moves the sliding frame downwards, causing the test piece to move until the splined rod is inserted into the differential lock, connecting the splined rod to one of the half-shaft gears. The drive motor then rotates the receiving platform, causing the differential lock housing to rotate at a certain speed. Simultaneously, the hysteresis brake provides... A certain load force is applied to clamp the planetary gears inside the differential lock. The torque and pressure sensors detect the load, and the data is transmitted to the control system in the electrical cabinet for recording and analysis. The system then determines whether the product is qualified. If it is qualified, the robot transport component moves the differential lock to the loading platform on the conveyor line. Otherwise, it is moved to the NG placement platform for processing. The entire operation is handled by the robot and the test piece is tested. There is no need for manual handling and testing, thus avoiding the troublesome operation and inaccurate test results of manual testing of differential locks.

[0023] 2. When the size of the differential lock to be tested changes, the spline rod can be replaced by fixing bolts. The position of the positioning pin on the receiving platform can be adjusted by operating the lever. That is, by rotating the operating lever, the drive bevel gear and one of the driving bevel gears mesh, and the driving bevel gear and the driven bevel gear mesh, so that the slider moves along the axial direction of the driven rod. This adjusts the position of the positioning pin on the receiving platform to accommodate the installation of differential locks of different sizes, thereby improving the adaptability of the testing device. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this embodiment of the application;

[0025] Figure 2 This is a schematic diagram illustrating the structure of the robot during material loading, as presented in this embodiment of the application.

[0026] Figure 3 This is a schematic diagram of the lifting assembly and the material carrier platform that highlights the features of this embodiment of the application;

[0027] Figure 4 This is a schematic diagram of the overall structure of the test equipment assembly in this embodiment of the application;

[0028] Figure 5 This is a schematic diagram of the structure of the test piece highlighted in this embodiment of the application;

[0029] Figure 6 This is a schematic diagram of the structure of the connection between the spline rod and the rotating rod in this embodiment of the application;

[0030] Figure 7This is a structural schematic diagram highlighting the column and rotating component in this embodiment of the application;

[0031] Figure 8 This is a partial cross-sectional schematic diagram of the rotating component in this embodiment of the present application.

[0032] Explanation of reference numerals in the attached drawings: 1. Fence; 2. Material conveyor line; 21. Lifting assembly; 211. Fixing frame; 2111. Fixing plate; 2112. Connecting plate; 212. Lifting cylinder; 213. Lifting plate; 3. Robot handling assembly; 31. Six-axis robot; 32. Mounting base; 321. Gripping cylinder; 322. Connecting block; 33. Gripper; 34. Lifting plate; 4. Test machine assembly; 41. Lower frame; 42. Column; 421. Vertical slide rail; 43. Test piece; 431. Sliding frame; 432. Mounting frame; 4321. Horizontal plate; 4322. Vertical plate; 4323. Reinforcing rib; 433. Connecting frame; 4331. Fixing block; 4332. Connecting base; 4333. Guide cylinder; 434. Hysteresis brake; 435. Electromagnetic brake; 44. Rotating component; 441. Fixed base; 442. Receiving platform; 4421. Clearance opening; 443. Drive motor; 444. Positioning post; 5. NG placement platform; 6. Carrying platform; 7. Material support base; 71. Clearance opening; 72. Limiting post; 8. Control component; 81. Control motor; 82. Linear guide rail; 9. Torque sensor; 10. Clamping component; 101. Clamping block; 1011. Tooth block; 102. Clamping cylinder; 11. Spline rod; 111. Fixed rod; 12. Rotating rod; 13. Fixed bushing; 14. Fixed bolt; 15. Mounting sleeve; 16. Operating component; 161. Driving rod; 162. Operating rod; 163. Driven rod; 164. Driving bevel gear; 165. Driven bevel gear; 166. Slider; 167. Pushing bevel gear; 17. Handle; 18. Fixing component. Detailed Implementation

[0033] The differential lock studied in this application is a type of differential, mainly comprising a housing, left / right half-shaft gears, two planetary gears, a drive shaft, and coils. It should be noted that the differential lock under test was in an unlocked state before testing.

[0034] The following provides a further detailed description of this application.

[0035] This application discloses a differential lock comprehensive testing device, referring to... Figure 1The differential lock comprehensive testing device includes a safety enclosure 1, a material conveyor 2 for loading, a robotic transport assembly 3 for handling the differential locks, a testing machine assembly 4, an NG (Not Acceptable) placement table 5, and an electrical cabinet. The electrical cabinet is located between the testing machine assembly 4 and the NG placement table 5. During testing, the material conveyor 2 transports the differential lock to be tested into the enclosure 1, positioned near the robotic transport assembly 3. The robotic transport assembly 3 then transports the differential lock to the testing machine assembly 4 for testing. The test data is transmitted to the electrical cabinet for recording, storage, and analysis. If the lock passes the test, it is then transported back to the material conveyor 2 by the robotic transport assembly 3; otherwise, it is moved to the NG placement table 5.

[0036] Reference Figure 1 Specifically, fence 1 is also designed with components such as doors and safety locks. Fence 1 also surrounds the robot handling assembly 3, the testing machine assembly 4, and the NG placement platform 5, preventing personnel from accidentally entering during testing and ensuring personnel safety.

[0037] Reference Figure 2 and Figure 3 The conveyor line 2 has enclosures 1 extending through both ends to transport differential locks under test and to transport qualified differential locks outside the enclosures 1. For this purpose, a loading platform 6 is horizontally slidably connected to the top of the conveyor line 2. The loading platform 6 is generally cuboid in shape, and its length is parallel to the conveying direction of the conveyor line 2. A support seat 7 is installed on the top of the loading platform 6 for placing the differential lock. Four clearance openings 71 are spaced apart on the top of the support seat 7 for the robot handling component 3 to insert and remove the differential lock. Four limiting posts 72 are spaced apart on the top of the support seat 7, distributed along the same circumference and located between adjacent clearance openings 71. A perforated flange is fixed to the bottom of the differential lock. During placement, the holes on the flange are fitted onto the limiting posts 72 to horizontally limit the differential lock.

[0038] Reference Figure 2 and Figure 3 Furthermore, a lifting assembly 21 is provided at the bottom of the conveyor line 2 for lifting the loading platform 6. The lifting assembly 21 includes a fixed frame 211 installed at the bottom of the conveyor line 2, a lifting cylinder 212 located at the bottom of the fixed frame 211, and a lifting plate 213 for lifting the loading platform 6 completely detached from the conveyor line 2. The fixed frame 211 includes a fixed plate 2111 located below the conveyor line 2 and two connecting plates 2112 fixed to the bottom of the conveyor line 2, with both ends of the fixed plate 2111 respectively installed on the connecting plates 2112. The lifting cylinder 212 is installed at the bottom of the fixed plate 2111, and the piston rod of the lifting cylinder 212 is slidably connected to the fixed plate 2111, with the top of the piston rod of the lifting cylinder 212 fixed to the bottom of the lifting plate 213.

[0039] Reference Figure 2 , the robot handling component 3 includes a six-axis robot 31 for handling the differential lock, a mounting base 32 installed on the six-axis robot 31, and two grippers 33 for clamping the differential lock. Among them, the feeding line body 2, the testing machine platform component 4, and the MG placement table are distributed around the six-axis robot 31 to achieve automated operation. The mounting base 32 is generally in a cuboid structure, and two grippers 33 are set as a group at one end of the mounting base 32. There are two groups of grippers 33 located on the mounting base 32 to improve the handling efficiency.

[0040] Reference Figure 2 , further, a pneumatic component is provided at the mounting base 32 adjacent to the gripper 33 for controlling the movement of the gripper 33 to clamp the differential lock. The pneumatic component is a clamping cylinder 321 installed at the bottom of the mounting base 32. Two clamping cylinders 321 are a group and are installed side by side at one end of the mounting base 32. The number of clamping cylinders 321 is the same as the number of grippers 33, and one clamping cylinder 321 is installed corresponding to one gripper 33. A connecting block 322 is fixed to the piston rod of the clamping cylinder 321, and the side of the connecting block 322 away from the piston rod is fixed to the gripper 33. The gripper 33 is generally in an "L" shape structure, and the side of the gripper 33 contacting the differential lock is set as an arc-shaped structure.

[0041] Reference Figure 2 , further, a lifting plate 34 is installed on the side of the gripper 33 away from the cylinder for supporting the bottom of the differential lock. The lifting plate 34 is generally also in an "L" shape structure. Before lifting the differential lock, the lifting plate 34 is inserted into the让位口 71 (it seems there is a misspelling here, maybe it should be a specific name), and at the same time the gripper 33 clamps the differential lock, then the differential lock can be clamped and transported to the testing machine platform component 4.

[0042] Reference Figure 4 and Figure 5 , the testing machine platform component 4 includes a lower frame 41, two columns 42 fixed on the top of the lower frame 41, a testing piece 43 arranged on the columns 42, and a rotating piece 44 arranged on the top of the lower frame 41. The testing piece 43 includes a sliding frame 431 slidably connected up and down to the columns 42, a mounting frame 432 and a connecting frame 433 installed on the side of the sliding frame 431 away from the columns 42, a hysteresis brake 434 and an electromagnetic brake 435 installed on the mounting frame 432, and a pressure sensor located at the connecting frame 433. Among them, a control component 8 is provided on the columns 42 for controlling the up and down movement of the sliding frame 431. The control component 8 includes a control motor 81 and a linear guide 82. A mounting block (not shown in the figure) for connecting the sliding frame 431 is slidably connected up and down to the linear guide 82. In addition, vertical slide rails 421 are respectively installed on both sides of the columns 42 close to the sliding frame 431. The sliding frame 431 is generally in a "冂" shape structure and is slidably connected up and down to the vertical slide rails 421. In other embodiments, the control component 8 can also adopt an embedded module (with a built-in motor).

[0043] Reference Figure 4 and Figure 5 The mounting bracket 432 is located directly above the connecting bracket 433. The mounting bracket 432 includes a horizontal plate 4321 fixed to the sliding bracket 431, a vertical plate 4322 vertically fixed to the top of the horizontal plate 4321, and a reinforcing rib 4323 disposed between the horizontal plate 4321 and the sliding bracket 431. The hysteresis brake 434 is mounted on the vertical plate 4322 and is located between the vertical plate 4322 and the control motor 81. The electromagnetic brake 435 is mounted on the horizontal plate 4321, such that the electromagnetic brake 435 is located directly below the hysteresis brake 434; the electromagnetic brake 435 and the hysteresis brake 434 are connected by a coupling, and the axis of the electromagnetic brake 435 coincides with the axis of the hysteresis brake 434.

[0044] Reference Figure 5 A torque sensor 9 is coaxially mounted directly below the electromagnetic brake 435. The top end of the torque sensor 9 is connected to the electromagnetic brake 435 via a coupling, and the torque sensor 9 is located above the pressure sensor.

[0045] Reference Figure 5 and Figure 6 The connecting frame 433 is equipped with a clamping component 10 for clamping the differential lock. The connecting frame 433 includes a fixing block 4331 installed on the side of the fixing frame 211 away from the column 42, and connecting seats 4332 installed on the left and right sides of the fixing block 4331. The clamping component 10 includes a clamping block 101 horizontally slidably connected to the bottom of the connecting seat 4332, and a clamping cylinder 102 for pushing the clamping block 101 to move. A guide cylinder 4333 is installed at the bottom of the connecting seat 4332, so that the clamping block 101 is slidably connected to the guide cylinder 4333, and one guide cylinder 4333 corresponds to one clamping block 101 for assembly. On the side of the clamping block 101 away from the clamping cylinder 102, there are toothed blocks 1011 fixed at intervals. The side of the toothed blocks 1011 away from the clamping block 101 is generally arc-shaped and is used to abut against the outer toothed ring of the differential lock near the top of the differential lock. During testing, the differential lock is clamped using clamping block 101 and toothed block 1011 to lock the differential lock housing.

[0046] Reference Figure 5 and Figure 6 Additionally, a pressure sensor is embedded in the clamping block 101 and the toothed block 1011. During testing, the pressure sensor abuts against the coil on the differential lock to continuously and stably output the reverse force experienced by the differential lock. The piston rod end of the clamping cylinder 102 is fixed to the side of the clamping block 101 away from the toothed block 101 to facilitate controlling the clamping block 101 to lock the differential lock.

[0047] Reference Figure 5 and Figure 6Furthermore, the connecting bracket 433, located below the pressure sensor, has a splined rod 11 for connecting one of the half-shaft gears inside the differential lock. A fixing rod 111 is coaxially fixed to the top of the splined rod 11, and the cross-section of the fixing rod 111 is generally quadrilateral. The fixing block 4331 is rotatably connected to a rotating rod 12 for connecting the fixing rod 111. The rotating rod 12 is generally cylindrical, with its two ends extending through the top and bottom of the fixing block 4331, respectively. A fixing groove is formed at the bottom of the rotating rod 12 for the fixing rod 111 to insert into, and the size of the fixing groove matches the size of the fixing rod 111. When the fixing rod 111 is located within the fixing groove, its sidewall abuts against the inner wall of the fixing groove, and the fixing rod 111, the rotating rod 12, and the torque sensor 9 are coaxially arranged.

[0048] Reference Figure 5 and Figure 6 Furthermore, a fixed bushing 13 is coaxially mounted on the rotating rod 12 for mounting the fixed rod 111. A fixing bolt 14 passes through the fixed bushing 13, which is used to lock the fixed rod 111 and the rotating rod 12. During installation, the fixing bolt 14 is horizontally inserted through the fixed bushing 13, the rotating rod 12, and the fixed rod 111, that is, both ends of the fixing bolt 14 protrude from the outer wall of the fixed bushing 13.

[0049] Reference Figure 5 and Figure 6 Furthermore, the bottom of the fixing block 4331 is fitted with a mounting sleeve 15. The mounting sleeve 15 and the rotating rod 12 are coaxially arranged, and during installation, the rotating rod 12 is located inside the mounting sleeve 15, that is, the two ends of the rotating rod 12 pass through the top and bottom ends of the mounting sleeve 15, respectively. In addition, the mounting sleeve 15 has four probes spaced apart for supplying power to the differential lock.

[0050] Reference Figure 7 and Figure 8 The rotating component 44 includes a fixed base 441 mounted on the top of the lower frame 41, a receiving platform 442 rotatably connected to the fixed base 441, a drive motor 443 for driving the receiving platform 442 to rotate, and a positioning column 444 movably mounted on the receiving platform 442. The top of the receiving platform 442 has a disc-like structure for placing the differential lock under test, allowing the test piece 43 to move downwards for testing. The drive motor 443 is mounted on the fixed base 441, and the motor shaft of the drive motor 443 and the receiving platform 442 are connected by conventional gear meshing, which will not be elaborated further here.

[0051] Reference Figure 7 and Figure 8Furthermore, the receiving platform 442 is provided with an operating element 16 for controlling the movement of the positioning column 444. The operating element 16 includes a driving rod 161 and an operating rod 162 rotatably connected to the receiving platform 442, a driven rod 163, a driving bevel gear 164 coaxially mounted at both ends of the driving rod 161, a driven bevel gear 165 coaxially mounted at one end of the driven rod 163, a slider 166 threadedly connected to the driven rod 163, and a pushing bevel gear 167 coaxially mounted at one end of the operating rod 162. The driving rod 161 is axially arranged vertically, and the driving rod 161, operating rod 162, and driven rod 163 are respectively mounted on the receiving platform 442 via bearing seats. The operating rod 162 and the driven rod 163 are axially arranged horizontally. In addition, the four driven bevel gears 165 are respectively engaged with the driving bevel gear 164, driving the bevel gear 167 to engage with the driving bevel gear 164 located below the driving rod 161.

[0052] Reference Figure 7 and Figure 8 Furthermore, there are four driven rods 163, which are evenly spaced along the circumference of the driving rod 161 on the receiving platform 442. The number of driven rods 163, positioning pins 444, and sliders 166 are the same, and one positioning pin 444 is assembled with one slider 166, that is, the bottom end of the positioning pin 444 is threaded to the top of the slider 166. The top of the receiving platform 442 is provided with clearance openings 4421 at intervals to allow the sliders 166 and positioning pins 444 to slide together.

[0053] Reference Figure 7 and Figure 8 Furthermore, the end of the operating lever 162 furthest from the drive lever 161 extends out of the outer wall of the receiving platform 442, and a handle 17 is installed at this end of the operating lever 162 to manually adjust the position of the positioning column 444 on the receiving platform 442, so that the receiving platform 442 can be adapted to the testing of differential locks of different sizes. The receiving platform 442 is provided with a fixing member 18 for locking the operating lever 162. The fixing member 18 is a support column fixing clamp installed on the side wall of the receiving platform 442, and the operating lever 162 passes through the support column fixing clamp.

[0054] All the above-mentioned power supply and control components are electrically connected to the electrical cabinet for unified power supply and control, enabling automated testing of differential locks.

[0055] The implementation principle of a differential lock comprehensive testing device in this application is as follows:

[0056] During testing, the conveyor line 2 and the loading platform 6 transport the differential lock to be tested to the lifting assembly. The lifting cylinder and lifting plate 213 are used to lift the loading platform 6 until it is completely separated from the conveyor line 2. Then, the six-axis robot 31 and the gripper 33 can be used to hold the differential lock and move it to the receiving platform 442. The positioning pin 444 is inserted into the bottom hole of the differential lock. Then, the control motor 81 drives the sliding frame 431 to move down, so that the entire test piece 43 moves down until the spline rod 11 is inserted into the differential lock, thus connecting the spline rod 11 with one of the half-shaft gears. Then, the drive motor 443 drives the receiving platform 442 to rotate, so that the differential lock housing rotates at a certain speed. At the same time, the hysteresis brake 434 provides a certain load force to clamp the planetary gear inside the differential lock. The torque sensor 9 and pressure sensor can detect the load, and the data obtained is transmitted to the control system in the electrical cabinet for recording and analysis. Then, it is determined whether the product is qualified. If it is qualified, the robot handling component 3 will transport the differential lock to the loading platform 6 on the conveyor line 2. Otherwise, it will be transported to the NG placement platform 5 for processing. The entire operation process is handled by the robot and the test piece 43 is responsible for testing. There is no need for manual handling and testing, thus avoiding the troublesome operation of manual testing of differential locks and the problem of inaccurate test results.

[0057] In the specific implementation of the differential lock test with coil, it should be noted that the rotational speed of the differential lock housing is set according to the parameters of the differential. The following example is the test of a differential lock with a rated speed of 25 RPM.

[0058] When the differential lock housing rotates as the active mechanism, it initially operates at a rated speed of 25 RPM. The magnetic powder brake provides a load force of 13.5 NM, clamping one of the half-shaft gears. Since it is in differential function, all rotational power is diverted to the planetary gears. When one half-shaft gear reaches 0 RPM and the other reaches 25 RPM (planetary gear end also 25 RPM), a 10V voltage is immediately applied to the differential lock coil. The energized coil locks the differential. Simultaneously, a pressure sensor detects the static torque value at the coil. While locking the differential, both half-shaft gears reach a constant speed of 25 RPM. The half-shaft gear at 25 RPM must always be controlled by its rotational speed, and the torque must be greater than the damping load. Products that pass the test are picked up by the robot and placed on the loading platform 6 of the conveyor line 2; otherwise, they are placed on the NG placement platform 5.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A comprehensive testing device for differential locks, characterized in that: It includes a fence (1) for safety protection, a conveyor line (2) for conveying differential locks, a robot handling assembly (3), a test machine assembly (4), and an NG placement table (5); The two ends of the conveyor line (2) are respectively provided with fences (1). The conveyor line (2) is horizontally slidably provided with a loading platform (6). The loading platform (6) is provided with a support seat (7) for placing the differential lock. The support seat (7) is provided with multiple limiting posts (72) for the differential lock to be inserted. The conveyor line (2) is provided with a lifting component (21) for lifting the loading platform (6). The robot handling assembly (3) includes a six-axis robot (31) for handling differential locks, a mounting base (32) disposed on the six-axis robot (31), and two grippers (33) for holding differential locks. The grippers (33) are movably disposed on the mounting base (32), and the mounting base (32) is provided with pneumatic components for controlling the movement of the grippers (33). The test machine assembly (4) includes a lower frame (41), a column (42) disposed on the lower frame (41), a test piece (43) disposed on the column (42), and a rotating component (44) disposed on the lower frame (41). The test piece (43) includes a sliding frame (431) disposed on the column (42) for vertical movement, a mounting frame (432) and a connecting frame (433) disposed on the sliding plate, a hysteresis brake (434) and an electromagnetic brake (435) disposed on the mounting frame (432), and a pressure transmission device disposed on the connecting frame (433). The column (42) is equipped with a control element (8) for controlling the movement of the sliding frame (431). The connecting frame (433) is located below the mounting frame (432). The sliding frame (431) is equipped with a torque sensor (9) between the electromagnetic brake (435) and the pressure sensor. The hysteresis brake (434), electromagnetic brake (435), torque sensor (9) and pressure sensor are arranged sequentially from top to bottom. The hysteresis brake (434), electromagnetic brake (435) and torque sensor (9) are coaxially connected. The connecting frame (433) is provided with a clamping member (10) for clamping the differential lock. The connecting frame (433) is provided with a spline rod (11) for connecting the differential lock below the pressure sensor. The spline rod (11) is coaxially arranged with the torque sensor (9). The rotating component (44) includes a fixed base (441) disposed on the lower frame (41), a receiving platform (442) rotatably connected to the fixed base (441), a drive motor (443) for driving the receiving platform (442) to rotate, and a positioning column (444) disposed on the receiving platform (442). The positioning column (444) is used to position the differential lock. There are multiple positioning columns (444) and they are slidably connected to the receiving platform (442). The receiving platform (442) is provided with a control component (8) for controlling the movement of the positioning column (444).

2. The differential lock comprehensive testing device according to claim 1, characterized in that: The control component (8) includes a drive rod (161) and an operating rod (162) rotatably disposed within the receiving platform (442), a driven rod (163), a drive bevel gear (164) coaxially disposed at both ends of the drive rod (161), a driven bevel gear (165) coaxially disposed at one end of the driven rod (163), a push bevel gear (167) coaxially disposed at one end of the operating rod (162), and a slider (166) threadedly connected to the driven rod (163). The number of driven rods (163) is the same as the number of positioning pins (444), and the multiple driven rods (163) are spaced apart along the circumferential direction. The slider (166) is horizontally slidably connected to the receiving platform (442), and the positioning column (444) is connected to the slider (166); the axial direction of the driving rod (161) and the axial direction of the driven rod (163) are perpendicular to each other, one end of the operating rod (162) extends to the outer wall of the receiving platform (442), and a fixing member (18) is provided between the operating rod (162) and the receiving platform (442); the pushing bevel gear (167) is meshed with the driving bevel gear (164) located at the bottom of the driving rod (161), and the driving bevel gear (164) is meshed with the driven bevel gear (165).

3. The differential lock comprehensive testing device according to claim 1, characterized in that: The connecting frame (433) includes a fixing block (4331) installed on the sliding frame (431) and connecting seats (4332) on both sides of the fixing block (4331). The fixing block (4331) is rotatably connected to a rotating rod (12) for installing the spline rod (11). The rotating rod (12) is coaxially arranged with the spline rod (11). An installation sleeve (15) is provided below the fixing block (4331). The rotating rod (12) is coaxially arranged with the installation sleeve (15) and the rotating rod (12) passes through the installation sleeve (15). A fixing bushing (13) for installing the spline rod (11) is coaxially arranged on the rotating rod (12). A fixing bolt (14) passes through the spline rod (11).

4. A differential lock comprehensive testing device according to claim 3, characterized in that: The spline rod (11) is coaxially provided with a fixing rod (111), and the bottom end of the rotating rod (12) is provided with a fixing groove for the fixing rod (111) to be inserted. The cross-section of the fixing rod (111) is polygonal, and the fixing rod (111) and the fixing groove are compatible.

5. A differential lock comprehensive testing device according to claim 3, characterized in that: The clamping member (10) includes a clamping block (101) that is horizontally slidably disposed on the connecting seat (4332) and a clamping cylinder (102) for pushing the clamping block (101) to move. The piston rod of the clamping cylinder (102) is fixed to the clamping, and the pressure sensor is disposed at the clamping block (101).

6. A differential lock comprehensive testing device according to claim 5, characterized in that: The clamping block (101) is provided with a toothed block (1011) for abutting the differential lock on the side away from the clamping cylinder (102).

7. A differential lock comprehensive testing device according to claim 1, characterized in that: The lifting assembly (21) includes a fixed frame (211) disposed on the conveyor line (2), a lifting cylinder (212) disposed on the fixed frame (211), and a lifting plate (213) for lifting the loading platform (6) to completely detach from the conveyor line (2). The piston rod of the lifting cylinder (212) is connected to the lifting plate (213), and the lifting plate (213) is always located between the loading platform (6) and the fixed frame (211).

8. A differential lock comprehensive testing device according to claim 1, characterized in that: The pneumatic component is a gripping cylinder (321) installed on the mounting base (32). The number of gripping cylinders (321) is the same as the number of grippers (33), and one gripping cylinder (321) corresponds to one gripper (33). The gripper (33) is provided with a lifting plate (34) for lifting the differential lock.

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