Endurance testing machine for coil spring of automobile safety belt

Abstract

The utility model relates to the field of coil spring detection, in particular to an automobile safety belt coil spring durability testing machine which comprises a workbench, a first motor is fixedly installed at the upper end of the workbench through an installation frame, an output shaft of the first motor is detachably fixed to a driving shaft through a sleeve shaft, and an installation disc is rotationally arranged on the driving shaft in a sleeved mode. The end of the driving shaft is further in transmission connection with a follow-up disc, the side, away from the mounting disc, of the follow-up disc is connected with the input end of a torque sensor through a follow-up shaft, and the torque sensor is connected with the workbench through a supporting piece. An insertion hole penetrating through the driving shaft is formed in the driving shaft, the inner end of the coil spring is inserted into the insertion hole, and the insertion hole extends in the radial direction of the driving shaft; an embedding groove is formed in the mounting disc, a hanging rod is connected in the embedding groove in a sliding mode, one end of the hanging rod is in clearance fit with the side wall of the follow-up disc, the structure of the driving shaft, the hanging rod and the like is adopted, the purpose of automatically tightening the coil spring before testing is achieved, and compared with manual tightening, the coil spring tightening device is faster, safer and more reliable.

Description

Technical Field

[0001] This utility model relates to an automotive seat belt coil spring durability testing machine, and more particularly to an automotive seat belt coil spring durability testing machine applied in the field of coil spring testing. Background Technology

[0002] The main structure of a car seat belt retractor includes a spiral spring (referred to as a coil spring or spiral spring). During the production process of the spiral spring, it is often necessary to conduct a durability test to determine the service life of the spiral spring when used in the seat belt retractor and to predict or verify the durability of the spiral spring.

[0003] To address the issues of complex structure, cumbersome operation, poor stability, and inaccurate test results in coil spring durability testing equipment, a certain spiral spring durability testing machine on the market adopts a linkage dual-axis structure design and has a certain market share.

[0004] Chinese utility model patent CN213022203U discloses a worm coil spring durability testing machine, including a frame and a drive mechanism, a testing frame, a torque sensor, and a stroke meter mounted on the frame. The testing frame includes a frame body and a connecting shaft. The connecting shaft is rotatably connected to the frame body and is used for mounting the worm coil spring and is fixedly connected to the inner end of the worm coil spring. The frame body is fixedly connected to the outer end of the worm coil spring. The drive mechanism is connected to the connecting shaft via a torque sensor. The torque sensor is used to detect the torque of the connecting shaft, and the stroke meter is used to measure the rotational stroke of the connecting shaft.

[0005] Existing coil spring durability testing machines typically require manual fixing of both ends of the coil spring when placing it (as described in the aforementioned patent document, fixing it to the frame and connecting shaft respectively) before testing can be conducted. However, for unraveling coil springs, it is necessary to manually tighten the coil spring so that both ends of the coil spring correspond to the position of the object to be fixed in order to complete the fixing. Manually tightening the coil spring is not only inconvenient and time-consuming, but also poses a certain danger if the coil spring automatically springs back. Utility Model Content

[0006] In view of the above-mentioned prior art, the technical problem to be solved by this utility model is how to design a coil spring durability testing machine that does not require tightening the coil spring and allows for convenient and quick placement of the coil spring.

[0007] To solve the above problems, this utility model provides an automotive seat belt coil spring durability testing machine, including a worktable. A first motor is fixedly mounted on the upper end of the worktable via a mounting bracket. The output shaft of the first motor is detachably fixed to a drive shaft via a sleeve shaft. A mounting plate is rotatably mounted on the drive shaft. A follower plate is also connected to the end of the drive shaft. The side of the follower plate away from the mounting plate is connected to the input end of a torque sensor via a follower shaft. The torque sensor is connected to the worktable via a support member.

[0008] The drive shaft has a through hole for inserting the inner end of the coil spring, and the through hole extends radially along the drive shaft.

[0009] The mounting plate has a groove, in which a hanging rod is slidably connected. One end of the hanging rod is clearance-fitted with the side wall of the follower plate, and a notch is provided on the hanging rod for the outer end of the coil spring to be hooked.

[0010] The hanging rod can be adjusted and fixed by adjusting the bolts and the mounting plate.

[0011] In the aforementioned automotive seatbelt coil spring durability testing machine, by improving the structure of the mounting plate and opening a hole on the drive shaft, and using it in conjunction with the hanging rod, the purpose of automatically tightening the coil spring before the test can be achieved. This is faster and safer than manual tightening.

[0012] As a further improvement of this application, the groove extends radially along the mounting plate, and the mounting plate is also provided with a through hole and an adjustment groove. The adjustment groove is located on the side of the mounting plate away from the groove, and the through hole connects the groove and the adjustment groove, and the width of the through hole is smaller than the width of the groove and the adjustment groove.

[0013] One end of the adjusting bolt is movably embedded in the adjusting groove, and the other end of the adjusting bolt is adapted to the thread of the screw hole on the hanging rod.

[0014] As a further improvement of this application, the follower disk and the mounting disk are coaxially arranged, and a square hole is opened on the side of the follower disk near the mounting disk. A square block is integrally formed on the end of the drive shaft near the follower disk, and the square block is inserted into the square hole.

[0015] As a further improvement of this application, a sleeve shaft is fixed to the output shaft end of the first motor, one end of the drive shaft is inserted into the end of the sleeve shaft, a positioning hole is provided on the drive shaft, a stepped hole is provided on the sleeve shaft, and a fastening bolt adapted to the thread of the positioning hole is inserted through the stepped hole.

[0016] As another improvement of this application, two support frames are installed on the worktable. The two support frames are used to support the follower shaft and the drive shaft respectively. The lower end of the support frame used to support the drive shaft is fixed to the worktable. The lower end of the support frame used to support the follower shaft is fixed with a slider. The upper end of the slider is fixed with a fixed frame. The torque sensor is fixed to the upper end of the fixed frame.

[0017] The upper part of the worktable is also provided with a slide groove for sliding installation of the slider, and a non-contact stroke sensor is fixed on the side of the support frame for supporting the follower shaft near the follower disk.

[0018] As another improvement of this application, a second motor is fixed on one side of the worktable, and a drive screw is fixed to the output shaft end of the second motor. The drive screw is threaded through the slider, and both ends of the drive screw are rotatably connected to the worktable.

[0019] In summary, when installing the coil spring, the user does not need to tighten it. Simply insert the inner end of the coil spring into the socket and fix it, ensuring the tail end of the spring is outside the hanging rod. Then, connect the follower plate to the mounting plate via the drive shaft. This confines the coil spring between the follower plate and the mounting plate. Start the first motor, causing its output shaft to drive the drive shaft through the sleeve shaft. This rotates the middle of the coil spring, which is automatically compressed by the hanging rod during rotation until the outer end of the coil spring engages with the notch on the hanging rod, completing the automatic tightening of the coil spring. Afterward, simply repeat the tightening and loosening of the coil spring using the first motor to conduct a durability test. By improving the structure of the mounting plate and adding a socket to the drive shaft, and using it with the hanging rod, the goal of automatically tightening the coil spring before testing can be achieved. This is faster and safer than manual tightening. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of an embodiment of this application;

[0021] Figure 2 This is a front view of an embodiment of this application;

[0022] Figure 3 This is a side sectional view of the mounting disk and the follower disk according to an embodiment of this application;

[0023] Figure 4 This is an exploded view of the hanging rod and adjusting bolt according to the embodiments of this application;

[0024] Figure 5 This is a partial cross-sectional view of the connection between the drive shaft and the sleeve shaft in an embodiment of this application.

[0025] Explanation of the labels in the diagram:

[0026] 1. Workbench, 2. First motor, 3. Mounting plate, 4. Follower plate, 5. Torque sensor, 6. Slider, 7. Second motor, 8. Drive screw, 9. Non-contact stroke sensor, 10. Fastening bolt, 11. Slide groove, 12. Mounting bracket, 13. Fixing bracket, 14. Support bracket, 15. Follower shaft, 16. Drive shaft, 17. Hanging rod, 18. Adjusting bolt, 19. Block, 20. Insertion hole, 21. Slot, 22. Through hole, 23. Adjustment groove, 24. Square hole, 25. Notch, 26. Screw hole, 27. Positioning hole, 28. Sleeve shaft, 29. Stepped hole. Detailed Implementation

[0027] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0028] Implementation method:

[0029] Figure 1-5A durability testing machine for automotive seat belt coil springs is shown, including a workbench 1. A first motor 2 is fixedly mounted on the upper end of the workbench 1 via a mounting bracket 12. The output shaft of the first motor 2 is detachably fixed to a drive shaft 16 via a sleeve shaft 28. A mounting plate 3 is rotatably mounted on the drive shaft 16. A follower plate 4 is also connected to the end of the drive shaft 16. The side of the follower plate 4 away from the mounting plate 3 is connected to the input end of a torque sensor 5 via a follower shaft 15. The torque sensor 5 is connected to the workbench 1 via a support member.

[0030] The drive shaft 16 has a through hole 20 for inserting the inner end of the coil spring, and the through hole 20 extends radially along the drive shaft 16.

[0031] The mounting plate 3 has a groove 21, in which a hanging rod 17 is slidably connected. One end of the hanging rod 17 is in clearance fit with the side wall of the follower plate 4. The hanging rod 17 has a notch 25 for the outer end of the coil spring to be hooked.

[0032] The hanging rod 17 can be adjusted and fixed to the mounting plate 3 by adjusting the bolt 18.

[0033] Based on the above structure, when installing the coil spring, the user does not need to tighten it. Simply insert the inner end of the coil spring into the insertion hole 20 and fix it, ensuring the tail end of the coil spring is outside the hanging rod 17. Then, connect the follower plate 4 to the mounting plate 3 via the drive shaft 16. This restricts the coil spring between the follower plate 4 and the mounting plate 3. At this point, simply start the first motor 2, causing its output shaft to drive the drive shaft 16 through the sleeve shaft 28. This causes the middle part of the coil spring to rotate, and during rotation, the middle part is automatically compressed by the hanging rod 17 until the outer end of the coil spring engages with the notch 25 on the hanging rod 17, completing the automatic tightening of the coil spring. Afterward, simply repeat the tightening and loosening of the coil spring using the first motor 2 to conduct a durability test. By improving the structure of the mounting plate 3 and opening the insertion hole 20 on the drive shaft 16 for use with the hanging rod 17, the purpose of automatically tightening the coil spring before testing can be achieved. This is faster and safer than manual tightening.

[0034] Furthermore, the groove 21 extends radially along the mounting plate 3, and the mounting plate 3 is also provided with a through hole 22 and an adjustment groove 23. The adjustment groove 23 is located on the side of the mounting plate 3 away from the groove 21. The through hole 22 connects the groove 21 and the adjustment groove 23, and the width of the through hole 22 is smaller than the width of the groove 21 and the adjustment groove 23.

[0035] One end of the adjusting bolt 18 is movably embedded in the adjusting groove 23, and the other end of the adjusting bolt 18 is threaded into the screw hole 26 on the hanging rod 17.

[0036] The operator can also loosen the adjusting bolt 18 to release the fastening limit of the hanging rod 17, allowing the hanging rod 17 to slide along the groove 21, thereby adjusting the distance between the hanging rod 17 and the drive shaft 16. This allows adjustment of the diameter of the disc-shaped body formed when the outer end of the coil spring is mounted on the hanging rod 17. This not only adjusts the torque of the coil spring after it is tightened, but also adapts to the use of coil springs of different sizes, improving the flexibility of the automotive seat belt coil spring durability testing machine.

[0037] Furthermore, the follower disk 4 is coaxially arranged with the mounting disk 3. A square hole 24 is provided on the side of the follower disk 4 near the mounting disk 3. A block 19 is integrally formed on the end of the drive shaft 16 near the follower disk 4. The block 19 is inserted into the square hole 24, thereby realizing the transmission connection between the drive shaft 16 and the follower disk 4.

[0038] Furthermore, a sleeve shaft 28 is fixed to the output shaft end of the first motor 2, and one end of the drive shaft 16 is inserted into the end of the sleeve shaft 28. A positioning hole 27 is provided on the drive shaft 16, and a stepped hole 29 is provided on the sleeve shaft 28. A fastening bolt 10 that is threaded and adapted to the positioning hole 27 is inserted through the stepped hole 29, thereby realizing the transmission connection between the first motor 2 and the drive shaft 16. The drive shaft 16 can be disassembled by unscrewing the fastening bolt 10, which is convenient for replacing and maintaining the drive shaft 16, making it more flexible and convenient to use.

[0039] Furthermore, two support frames 14 are installed on the worktable 1. The two support frames 14 are used to support the follower shaft 15 and the drive shaft 16 respectively. The lower end of the support frame 14 used to support the drive shaft 16 is fixed to the worktable 1. The lower end of the support frame 14 used to support the follower shaft 15 is fixed with a slider 6. The upper end of the slider 6 is fixed with a fixing frame 13. The torque sensor 5 is fixed to the upper end of the fixing frame 13.

[0040] The upper end of the worktable 1 is also provided with a slide groove 11 for sliding installation of the slider 6. The support frame 14 for supporting the follower shaft 15 is also fixed with a non-contact stroke sensor 9 on the side near the follower disk 4. The non-contact stroke sensor 9 is existing technology, and its specific structure and working principle will not be described in detail here.

[0041] A second motor 7 is fixed on one side of the worktable 1. A drive screw 8 is fixed to the output shaft end of the second motor 7. The drive screw 8 is threaded through the slider 6, and both ends of the drive screw 8 are rotatably connected to the worktable 1.

[0042] Before installing the coil spring, the user can turn on the second motor 7 and use the drive screw 8 to drive the slider 6 to slide along the slide groove 11, so that the follower plate 4, torque sensor 5, and non-contact stroke sensor 9 move away from the mounting plate 3 simultaneously, which facilitates the installation of the coil spring. After the coil spring is installed, the second motor 7 can drive the drive screw 8 to rotate in the opposite direction, so that the follower plate 4, torque sensor 5, and non-contact stroke sensor 9 move closer to the mounting plate 3 simultaneously, thereby confining the coil spring between the mounting plate 3 and the follower plate 4, and making the follower plate 4 connected to the drive shaft 16 for transmission, which facilitates the test.

[0043] This automotive seatbelt coil spring durability testing machine achieves a more compact overall structure compared to existing technologies by coaxially setting the torque sensor 5 with the drive shaft 16, avoiding excessive transmission structures, improving the overall stability of the equipment, and resulting in better actual performance.

[0044] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A durability testing machine for automotive seatbelt coil springs, comprising a workbench (1), wherein a first motor (2) is fixedly mounted on the upper end of the workbench (1) via a mounting bracket (12), the output shaft of the first motor (2) is detachably fixed to a drive shaft (16) via a sleeve shaft (28), a mounting plate (3) is rotatably mounted on the drive shaft (16), and a follower plate (4) is also connected to the end of the drive shaft (16), the side of the follower plate (4) away from the mounting plate (3) is connected to the input end of a torque sensor (5) via a follower shaft (15), and the torque sensor (5) is connected to the workbench (1) via a support member, characterized in that: The drive shaft (16) has a through hole (20) for inserting the inner end of the coil spring, and the through hole (20) extends radially along the drive shaft (16). The mounting plate (3) has a groove (21) and a hanging rod (17) is slidably connected in the groove (21). One end of the hanging rod (17) is in clearance fit with the side wall of the follower plate (4). The hanging rod (17) has a notch (25) for the outer end of the coil spring to be hung. The hanging rod (17) can be adjusted and fixed to the mounting plate (3) by adjusting bolts (18).

2. The automotive seatbelt coil spring durability testing machine according to claim 1, characterized in that: The groove (21) extends radially along the mounting plate (3). The mounting plate (3) is also provided with a through hole (22) and an adjustment groove (23). The adjustment groove (23) is located on the side of the mounting plate (3) away from the groove (21). The through hole (22) connects the groove (21) and the adjustment groove (23). The width of the through hole (22) is smaller than the width of the groove (21) and the adjustment groove (23). One end of the adjusting bolt (18) is movably embedded in the adjusting groove (23), and the other end of the adjusting bolt (18) is threadedly matched with the screw hole (26) on the hanging rod (17).

3. The automotive seatbelt coil spring durability testing machine according to claim 2, characterized in that: The follower disk (4) is coaxially arranged with the mounting disk (3). The follower disk (4) has a square hole (24) on the side near the mounting disk (3). The drive shaft (16) has a block (19) integrally formed on the end near the follower disk (4). The block (19) is inserted into the square hole (24).

4. The automotive seatbelt coil spring durability testing machine according to claim 1, characterized in that: The output shaft of the first motor (2) is fixed with a sleeve shaft (28). One end of the drive shaft (16) is inserted into the end of the sleeve shaft (28). The drive shaft (16) has a positioning hole (27). The sleeve shaft (28) has a stepped hole (29). A fastening bolt (10) that is threaded and adapted to the positioning hole (27) is inserted through the stepped hole (29).

5. The automotive seatbelt coil spring durability testing machine according to claim 1, characterized in that: Two support frames (14) are installed on the workbench (1). The two support frames (14) are used to support the follower shaft (15) and the drive shaft (16) respectively. The lower end of the support frame (14) used to support the drive shaft (16) is fixed to the workbench (1). The lower end of the support frame (14) used to support the follower shaft (15) is fixed with a slider (6). The upper end of the slider (6) is fixed with a fixing frame (13). The torque sensor (5) is fixed to the upper end of the fixing frame (13). The upper end of the workbench (1) is also provided with a slide groove (11) for sliding installation of the slider (6), and a non-contact stroke sensor (9) is fixed on the side of the support frame (14) for supporting the follower shaft (15) near the follower disk (4).

6. The automotive seatbelt coil spring durability testing machine according to claim 5, characterized in that: A second motor (7) is fixed on one side of the worktable (1). A drive screw (8) is fixed on the output shaft end of the second motor (7). The drive screw (8) is threaded through the slider (6), and both ends of the drive screw (8) are rotatably connected to the worktable (1).

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