Automobile safety belt mortise lock detection device

Abstract

The utility model discloses an automobile safety belt mortise lock detection device, which relates to the technical field of detection devices and comprises a detection support, one side in the detection support is fixedly connected with a first motor, and one end of the top surface of the detection support is simultaneously and slidably connected with a group of corresponding positioning clamps through the output end of the first motor. According to the safety belt mortise lock pulling test device, after the safety belt and the pulling fastener are fixed, the second motor is activated, and the driving gear is tightly matched with the guide rail, so that the pulling test of the safety belt mortise lock is realized; the tensile force borne by the safety belt mortise lock during emergency braking or collision is accurately simulated, so that the device can comprehensively evaluate the strength and durability of the safety belt mortise lock so as to further detect the state of the safety belt mortise lock when the safety belt mortise lock bears the extreme load, and it is ensured that the integrity and functions of the safety belt mortise lock can still be kept when the safety belt mortise lock bears the extreme load.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection device technical field, specifically a kind of automobile safety belt latch detection device. BACKGROUND

[0002] Automobile safety belt latch durability detection device is a kind of test equipment specially designed to evaluate the durability of safety belt latch, the device usually contains mechanical life test and environmental simulation test, mechanical life test is simulated long-term use condition by constantly plugging, to test whether latch can still maintain good performance after experiencing multiple operations, verify the stability of function, this device is crucial to ensure vehicle occupant safety, is indispensable detection tool in automobile manufacturing process.

[0003] In practical application, automobile safety belt latch detection device usually adopts drop test to detect the strength of safety belt latch and vibration and impact test to simulate the reaction of safety belt latch under long-term use and emergency, although the above test can test the strength and durability of safety belt latch and other aspects, but due to the lack of existing device to the pulling test of safety belt latch, the performance of latch when suffering longitudinal tension cannot be fully understood, therefore, once in the event of vehicle collision or sudden stop, if safety belt latch cannot withstand strong pulling force, it may lead to latch failure, and further affect the safety of passengers, in view of this, we provide a kind of automobile safety belt latch detection device. UTILITARIAN CONTENT

[0004] The utility model aims at making up for the deficiency of prior art, and provides an automobile safety belt latch detection device.

[0005] To achieve the above object, the utility model provides the following technical scheme: an automobile safety belt latch detection device, including detection support, the inside one side of detection support is fixedly connected with first motor, and the top surface one end of detection support is simultaneously slidably connected with a group of corresponding positioning clamps through first motor output end, the first motor output end is connected with the inside wall one side of detection support, and the outer wall of first motor output end is connected with the inside wall one side of detection support and is fixedly connected with two-way screw rod, the positioning clamp is located two-way screw rod top one end, and the positioning clamp is slidably connected with the top surface one side of detection support through two-way screw rod, the top surface both sides of detection support are respectively provided with a group of corresponding guide grooves, and the top surface of detection support and the one end of positioning clamp are slidably connected with connecting frame through guide groove, the guide groove is located connecting frame bottom both sides, and the one side center of connecting frame is fixedly connected with pulling fastener.

[0006] The detection support top surface one end is provided with a set of corresponding sliding grooves, and the sliding grooves are located on both sides of the bottom of the positioning clamp.

[0007] The detection support inside one end is slidably connected with a plurality of corresponding positioning frames through a bidirectional screw rod, and the detection support inner wall is fixedly connected with a slide rail on both sides.

[0008] The bidirectional screw rod outer wall one end is connected with the positioning frame bottom one side, and the bidirectional screw rod outer wall one end is rotatably connected with the positioning frame inside bottom through threads.

[0009] The guide groove inside bottom is fixedly connected with a guide rail, and the guide groove inside one end is slidably connected with a guide sliding block through the guide rail.

[0010] The detection support inside both sides are respectively provided with a set of corresponding racks, and the detection support inside both sides are rotatably connected with a plurality of drive gears through the racks.

[0011] The connecting frame one side bottom is fixedly connected with a second motor, and the second motor output end is fixedly connected with a first belt pulley.

[0012] Compared with the prior art, the automobile safety belt lock detection device has the following beneficial effects:

[0013] The utility model discloses a safety belt lock is fixed to the top of detection support through positioning clamp, and then the safety belt buckle is inserted into the safety belt lock, and the safety belt of the safety belt buckle is fixed to the pulling buckle, and the second motor is activated, and when the first pulley is rotated by the output end of the second motor, the driving shaft rotates in the bottom of the connecting frame, the driving shaft is fixed to the plurality of driving gears through the outer wall both ends, and the rack inside the detection support is meshed, the device is driven through the meshing transmission of the driving gear and the rack, and the connecting frame and the pulling buckle move along the guide rail outer wall horizontally, so that the safety belt is fixed to the pulling buckle, the second motor is activated, and the driving gear and the guide rail are closely matched, realize the pulling test of the safety belt lock, and the pulling force that the safety belt lock receives when emergency braking or collision is simulated accurately, so that the device can comprehensively evaluate the strength and durability of the safety belt lock, to further detect the state of the safety belt lock when bearing extreme load, ensure that the safety belt lock can still maintain its integrity and function when bearing extreme load.

[0014] The utility model discloses a safety belt lock is fixed to the top of detection support through positioning clamp, and then the safety belt buckle is inserted into the safety belt lock, and the safety belt of the safety belt buckle is fixed to the pulling buckle, and the second motor is activated, and when the first pulley is rotated by the output end of the second motor, the driving shaft rotates in the bottom of the connecting frame, the driving shaft is fixed to the plurality of driving gears through the outer wall both ends, and the rack inside the detection support is meshed, the device is driven through the meshing transmission of the driving gear and the rack, and the connecting frame and the pulling buckle move along the guide rail outer wall horizontally, so that the safety belt is fixed to the pulling buckle, the second motor is activated, and the driving gear and the guide rail are closely matched, realize the pulling test of the safety belt lock, and the pulling force that the safety belt lock receives when emergency braking or collision is simulated accurately, so that the device can comprehensively evaluate the strength and durability of the safety belt lock, to further detect the state of the safety belt lock when bearing extreme load, ensure that the safety belt lock can still maintain its integrity and function when bearing extreme load.

[0015] The other advantages, objects and features of the utility model will be set forth in the subsequent description to some extent, and to some extent, it will be obvious to the person skilled in the art based on the study of the following text or can be taught from the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0017] Figure 2 It is the partial cut and the partial three-dimensional structure schematic diagram of positioning clamp of detection support of the utility model;

[0018] Figure 3 This is a partially exploded three-dimensional structural diagram of the bidirectional lead screw and positioning clamp of this utility model;

[0019] Figure 4 This is a partial cross-section of the detection support of this utility model and a partial three-dimensional structural diagram of the connecting frame;

[0020] Figure 5 This is a partially exploded three-dimensional structural diagram of the connecting frame and drive shaft of this utility model;

[0021] Figure 6 This utility model Figure 5 A schematic diagram of the partial three-dimensional structure of A.

[0022] In the diagram: 1. Detection support; 2. First motor; 201. Positioning fixture; 202. Two-way lead screw; 203. Slide groove; 204. Positioning frame; 205. Slide rail; 3. Guide groove; 301. Connecting frame; 302. Pull fastener; 303. Guide rail; 304. Guide slider; 305. Drive gear; 306. Drive shaft; 307. Second motor; 308. First pulley; 309. Second pulley; 3010. Transmission belt. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1-6 As shown, this utility model provides a technical solution: a car seat belt lock detection device, including a detection support 1. A first motor 2 is fixedly connected to one side of the inside of the detection support 1, and a set of corresponding positioning clamps 201 are slidably connected to one end of the top surface of the detection support 1 through the output end of the first motor 2. The output end of the first motor 2 is connected through to one side of the inner wall of the detection support 1, and a bidirectional screw 202 is fixedly connected through to the outer wall of the output end of the first motor 2 and one side of the inner wall of the detection support 1. The positioning clamp 201 is located at the top end of the bidirectional screw 202, and the positioning clamp 201 is slidably connected to one side of the top surface of the detection support 1 through the bidirectional screw 202. A set of corresponding guide grooves 3 are respectively opened on both sides of the top surface of the detection support 1, and a connecting frame 301 is slidably connected to one end of the positioning clamp 201 on the top surface of the detection support 1 through the guide groove 3. The guide grooves 3 are located on both sides of the bottom of the connecting frame 301, and a pull buckle 302 is fixedly connected to the center of one side of the connecting frame 301.

[0025] Adjust the orientation of the seatbelt buckle so that the end with the buckle is facing the end of the pull buckle 302. Place the seatbelt buckle between the positioning clamps 201. Activate the first motor 2. The output of the first motor 2 drives the bidirectional lead screw 202 to rotate. Since a slide groove 203 and a slide rail 205 are respectively opened and fixed on one end of the top surface of the detection support 1 and on both sides of its inner wall, and the outer wall of the top of the positioning frame 204 is fixedly connected to the center of the bottom surface of the positioning clamp 201, the slide groove 203 and the slide rail 205 limit the positioning frame 204 and the positioning clamp 201 respectively. This allows the positioning frame 204 and the positioning clamp 201 to move horizontally only along the inner wall of the slide groove 203 and the outer wall of the slide rail 205. As the output of the first motor 2 drives the bidirectional lead screw 202 to rotate, the positioning frame 204 and the positioning clamp 201 are positioned at a fixed point. At the bottom of the support frame 204, the bidirectional lead screw 202, through its threaded outer wall, drives multiple positioning frames 204 on both sides of the inner side of the detection support 1, causing the positioning clamps 201 fixed on the outer wall of their tops to move along the outer wall of the slide rail 205 and the inner wall of the slide groove 203. Driven by the bidirectional lead screw 202, the multiple positioning clamps 201 at one end of the top surface of the detection support 1 abut against the outer walls of the seat belt lock, successfully fixing the seat belt lock to one end of the top surface of the detection support 1. Thus, through the close cooperation between the first motor 2, the positioning clamps 201, the bidirectional lead screw 202, and the slide rail 205, the device can quickly and effectively fix the seat belt lock to the top of the detection support 1. Afterwards, insert the seat belt buckle into the seat belt lock and fix one end of the seat belt buckle to the pull buckle 302. Activate the second motor 307. When the output end of the second motor 307 drives the first pulley 308 to rotate, the first pulley 308 transmits the power from the output end of the second motor 307 to the drive shaft 306 through the transmission belt 3010 and the second pulley 309. Since a guide rail 303 is provided at the bottom of the guide groove 3 and passes through the center of the guide slider 304, the guide groove 3 and the guide rail 303 limit the guide slider 304 and the connecting frame 301, so that the connecting frame 301 can only slide horizontally along the outer wall of the guide rail 303 when moving. As the drive shaft 306 rotates, the connecting frame 301 can only slide horizontally along the outer wall of the guide rail 303. Inside the bottom of the connecting frame 301, the drive shaft 306 meshes with racks on both sides of the detection support 1 via multiple drive gears 305 fixed at both ends of its outer wall. This allows the device to drive the connecting frame 301 and the pull buckle 302 horizontally along the outer wall of the guide rail 303 through the meshing of the drive gears 305 and the racks. By fixing the seatbelt to the pull buckle 302, the second motor 307 is activated, and the drive gears 305 and the guide rail 303 work closely together to perform a pull test on the seatbelt latch. By accurately simulating the tension experienced by the seatbelt latch during emergency braking or a collision, the device can comprehensively evaluate the strength and durability of the seatbelt latch, further testing its condition under extreme loads.Ensure that the seatbelt locking mechanism maintains its integrity and functionality even under extreme loads.

[0026] like Figures 1-3 As shown, a set of corresponding sliding grooves 203 are simultaneously formed on one end of the top surface of the detection support 1, and the sliding grooves 203 are located on both sides of the bottom of the positioning fixture 201. One side of the bottom surface of the positioning fixture 201 is connected through to one end of the top surface of the sliding groove 203, and one side of the bottom surface of the positioning fixture 201 is slidably connected to one end of the interior of the sliding groove 203. One end of the interior of the detection support 1 is slidably connected to multiple corresponding positioning frames 204 through a bidirectional screw 202, and slide rails 205 are fixedly connected to both sides of the inner wall of the detection support 1. The slide rails 205 are respectively located in the fixed positions. The positioning frame 204 is located on both sides inside, and the bottom of the positioning frame 204 is located at the top of one end of the bidirectional lead screw 202. The outer wall of the top of the positioning frame 204 is fixedly connected to the center of the bottom surface of the positioning fixture 201. One end of the outer wall of the bidirectional lead screw 202 is connected through to one side of the bottom of the positioning frame 204. The outer wall of the bidirectional lead screw 202 is rotatably connected to the bottom of the positioning frame 204 through a thread. One end of the outer wall of the slide rail 205 is connected through to one side of the outer wall of the positioning frame 204. The inner side of the positioning frame 204 is slidably connected to one side of the outer wall of the slide rail 205.

[0027] Adjust the orientation of the seatbelt buckle so that the end with the buckle is facing the end of the pull buckle 302. Place the seatbelt buckle between the positioning clamps 201. Activate the first motor 2. The output of the first motor 2 drives the bidirectional lead screw 202 to rotate. Since the top surface of the detection support 1 and both sides of its inner wall have a slide groove 203 and a slide rail 205 respectively, and the top outer wall of the positioning frame 204 is fixedly connected to the center of the bottom surface of the positioning clamp 201, the slide groove 203 and the slide rail 205 limit the positioning frame 204 and the positioning clamp 201 respectively. This allows the positioning frame 204 and the positioning clamp 201 to move horizontally only along the inner wall of the slide groove 203 and the outer wall of the slide rail 205. As the output of the first motor 2 drives the bidirectional lead screw 202 to rotate at the bottom of the positioning frame 204, the bidirectional lead screw 202 is driven by the threads on its outer wall. Multiple positioning frames 204 on both sides of the inner side of the test support 1 drive the positioning clamps 201 fixed on the outer wall of its top to move along the outer wall of the slide rail 205 and the inner wall of the slide groove 203. Under the drive of the bidirectional lead screw 202, the multiple positioning clamps 201 at one end of the top surface of the test support 1 come into contact with the two sides of the outer wall of the seat belt lock, and successfully fix the seat belt lock at one end of the top surface of the test support 1. Thus, through the close cooperation between the first motor 2, the positioning clamps 201, the bidirectional lead screw 202 and the slide rail 205, the device can quickly and effectively fix the seat belt lock at the top of the test support 1, ensuring its reliability during the test process. The seat belt lock will not fall off the top surface of the test support 1 due to sudden pulling, causing the test to fail. The seat belt lock can be further pulled by pulling the buckle 302 and the drive gear 305 in the subsequent pull test.

[0028] like Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, a guide rail 303 is fixedly connected to the bottom of the guide groove 3, and a guide slider 304 is slidably connected to one end of the guide groove 3 via the guide rail 303. The outer wall of the top of the guide slider 304 is fixedly connected to the bottom surface of one side of the connecting frame 301. One end of the outer wall of the guide rail 303 is connected through the center of the outer wall of the guide slider 304, and the bottom end of the guide slider 304 is slidably connected to one end of the outer wall of the guide rail 303. A set of corresponding racks is provided on both sides of the inside of the detection support 1, and the two sides of the inside of the detection support 1 are engaged by the racks. Multiple drive gears 305 are rotatably connected to the connecting frame 301. A drive shaft 306 is rotatably connected to the bottom of the connecting frame 301. Multiple drive gears 305 are fixedly connected to the outer walls of both ends of the drive shaft 306. A second motor 307 is fixedly connected to the bottom surface of one side of the connecting frame 301. A first pulley 308 is fixedly connected to the output end of the second motor 307. A second pulley 309 is fixedly connected to the center of the outer wall of the drive shaft 306. A transmission belt 3010 is sleeved on the outer walls of both the first pulley 308 and the second pulley 309.

[0029] After the seat belt lock is fixed to the top surface of the detection support 1 by the positioning clamp 201, the seat belt buckle is inserted into the seat belt lock, and one end of the seat belt of the seat belt buckle is fixed to the pull buckle 302. The second motor 307 is activated. When the output end of the second motor 307 drives the first pulley 308 to rotate, the first pulley 308 transmits the power of the output end of the second motor 307 to the drive shaft 306 through the transmission belt 3010 and the second pulley 309. Since the guide rail 303 is provided at the bottom of the guide groove 3 and passes through the center of the guide slider 304, the guide groove 3 and the guide rail 303 limit the guide slider 304 and the connecting frame 301, so that the connecting frame 301 can only slide horizontally along the outer wall of the guide rail 303 when it moves. As the drive shaft 306 rotates, the connecting frame 301 can only slide horizontally along the outer wall of the guide rail 303. Inside the bottom of the frame 301, the drive shaft 306 meshes with the racks on both sides of the test support 1 via multiple drive gears 305 fixed at both ends of its outer wall. This allows the device to drive the connecting frame 301 and the pull buckle 302 to move horizontally along the outer wall of the guide rail 303 through the meshing transmission of the drive gears 305 and the racks. Thus, after the seat belt is fixed to the pull buckle 302, the second motor 307 is activated, and the drive gears 305 and the guide rail 303 are tightly engaged to achieve the pull test of the seat belt lock. By accurately simulating the tension experienced by the seat belt lock during emergency braking or collision, the device can comprehensively evaluate the strength and durability of the seat belt lock, and further test the state of the seat belt lock under extreme loads, ensuring that the seat belt lock can still maintain its integrity and function under extreme loads.

[0030] Working principle: Adjust the orientation of the seat belt latch so that the end with the latch faces the end of the pull buckle 302. Place the seat belt latch between the positioning clamps 201. Activate the first motor 2, which drives the bidirectional lead screw 202 to rotate through its output. Since a sliding groove 203 and a slide rail 205 are respectively opened and fixed on one end of the top surface of the detection support 1 and on both sides of its inner wall, and the outer wall of the top of the positioning frame 204 is fixedly connected to the center of the bottom surface of the positioning clamp 201, the sliding groove 203 and the slide rail 205 limit the positioning frame 204 and the positioning clamp 201, allowing them to move horizontally only along the inner wall of the sliding groove 203 and the outer wall of the slide rail 205. As the output of the first motor 2 drives the bidirectional lead screw 202 to rotate at the bottom of the positioning frame 204, the bidirectional lead screw 202, through the threads on its outer wall, drives multiple positioning frames 204 on both sides inside the detection support 1 to move the positioning clamps 201 fixed on the outer wall of their tops along the outer wall of the slide rail 205 and the inner wall of the slide groove 203. Under the drive of the bidirectional lead screw 202, the multiple positioning clamps 201 at one end of the top surface of the detection support 1 come into contact with the two sides of the outer wall of the seat belt lock, and successfully fix the seat belt lock at one end of the top surface of the detection support 1. Thus, through the close cooperation between the first motor 2, the positioning clamps 201, the bidirectional lead screw 202 and the slide rail 205, the device can quickly and effectively... The seat belt lock is fixed to the top of the detection support 1. After the seat belt lock is fixed to the top surface of the detection support 1 by the positioning clamp 201, the seat belt buckle is inserted into the seat belt lock, and one end of the seat belt buckle is fixed to the pull buckle 302. The second motor 307 is activated. When the output end of the second motor 307 drives the first pulley 308 to rotate, the first pulley 308 transmits the power from the output end of the second motor 307 to the drive shaft 306 through the transmission belt 3010 and the second pulley 309. Since a guide rail 303 is provided at the bottom of the guide groove 3 and passes through the center of the guide slider 304, the guide slider 304 is guided by the guide groove 3 and the guide rail 303. After the 04 and connecting frame 301 are limited, the connecting frame 301 can only slide horizontally along the outer wall of the guide rail 303 when it moves. As the drive shaft 306 rotates at the bottom of the connecting frame 301, the drive shaft 306 meshes with the racks on both sides of the inside of the detection support 1 through multiple drive gears 305 fixed at both ends of its outer wall. This allows the device to drive the connecting frame 301 and the pull buckle 302 to move horizontally along the outer wall of the guide rail 303 through the meshing transmission of the drive gears 305 and the racks. Thus, after the safety belt is fixed to the pull buckle 302, the second motor 307 is activated, and the drive gears 305 and the guide rail 303 are tightly engaged to realize the pull test of the safety belt lock.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vehicle seatbelt latch detection device, comprising a detection support (1), characterized in that: A first motor (2) is fixedly connected to one side of the inside of the detection support (1), and a set of corresponding positioning clamps (201) is slidably connected to one end of the top surface of the detection support (1) through the output end of the first motor (2). The output end of the first motor (2) is connected through one side of the inner wall of the detection support (1), and a bidirectional lead screw (202) is fixedly connected through one side of the inner wall of the first motor (2) and the outer wall of the output end of the first motor (2). The positioning clamps (201) are located on the top of the bidirectional lead screw (202). One end of the part is connected to the positioning clamp (201) via a two-way screw (202) and the top surface of the detection support (1). A set of corresponding guide grooves (3) are provided on both sides of the top surface of the detection support (1). A connecting frame (301) is slidably connected to the top surface of the detection support (1) and one end of the positioning clamp (201) via the guide groove (3). The guide groove (3) is located on both sides of the bottom of the connecting frame (301). A pull fastener (302) is fixedly connected to the center of one side of the connecting frame (301).

2. The vehicle seatbelt locking detection device according to claim 1, characterized in that: The top surface of the detection support (1) is provided with a set of corresponding sliding grooves (203), and the sliding grooves (203) are located on both sides of the bottom of the positioning fixture (201). One side of the bottom surface of the positioning fixture (201) is connected through to one end of the top surface of the sliding groove (203), and one side of the bottom surface of the positioning fixture (201) is slidably connected to one end of the inside of the sliding groove (203).

3. The vehicle seatbelt latch detection device according to claim 2, characterized in that: The detection support (1) has multiple corresponding positioning frames (204) slidably connected to one end of the inner wall of the detection support (1) via a bidirectional screw (202). Slide rails (205) are fixedly connected to both sides of the inner wall of the detection support (1). The slide rails (205) are located on both sides of the inner wall of the positioning frame (204). The bottom end of the inner wall of the positioning frame (204) is located at the top end of one end of the bidirectional screw (202). The outer wall of the top end of the positioning frame (204) is fixedly connected to the center of the bottom surface of the positioning fixture (201).

4. The vehicle seatbelt locking detection device according to claim 3, characterized in that: One end of the outer wall of the bidirectional lead screw (202) is connected through to the bottom end of one side of the positioning frame (204), and one end of the outer wall of the bidirectional lead screw (202) is rotatably connected to the bottom end of the inside of the positioning frame (204) by a thread. One end of the outer wall of the slide rail (205) is connected through to one side of the outer wall of the positioning frame (204), and one side of the inside of the positioning frame (204) is slidably connected to one side of the outer wall of the slide rail (205).

5. The vehicle seatbelt latch detection device according to claim 1, characterized in that: The bottom of the guide groove (3) is fixedly connected to a guide rail (303), and one end of the guide groove (3) is slidably connected to a guide slider (304) through the guide rail (303). The top outer wall of the guide slider (304) is fixedly connected to the bottom surface of one side of the connecting frame (301). One end of the outer wall of the guide rail (303) is connected through the center of the outer wall of the guide slider (304), and the bottom of the guide slider (304) is slidably connected to one end of the outer wall of the guide rail (303).

6. The vehicle seatbelt latch detection device according to claim 5, characterized in that: The detection support (1) has a set of corresponding racks on both sides inside, and multiple drive gears (305) are rotatably connected to both sides inside the detection support (1) through the meshing of the racks. The bottom of the connecting frame (301) is rotatably connected to a drive shaft (306), and multiple drive gears (305) are fixedly connected to the outer walls of both ends of the drive shaft (306).

7. The vehicle seatbelt locking detection device according to claim 6, characterized in that: A second motor (307) is fixedly connected to one side of the bottom surface of the connecting frame (301), and a first pulley (308) is fixedly connected to the output end of the second motor (307). A second pulley (309) is fixedly connected to the center of the outer wall of the drive shaft (306), and a transmission belt (3010) is sleeved on the outer wall of both the first pulley (308) and the second pulley (309).

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