Gear M value measuring instrument

Abstract

The utility model relates to the field of measuring instruments, in particular to a gear M value measuring instrument which comprises a bottom plate. And a servo moving mechanism is arranged at the upper end of the bottom plate. The external gear is placed on the upper end face of the chassis through the manipulator, then the servo moving mechanism is started to drive the moving plate and the moving block to move, the external gear is pushed to a measuring position, the camera shooting assembly is started to shoot an end face picture of the external gear, and the picture is analyzed through a computer. Then two sliding table air cylinders which are oppositely arranged are started to enable the two measuring heads to be close to each other, when the two measuring heads make contact with the outer tooth surface (in a tooth groove) of the gear, the length measuring sensor is started, numerical values of the camera shooting assembly are collected, the sliding table air cylinders are started again to drive the measuring heads to move oppositely, and the measuring heads are disengaged from the tooth surface; then a second motor is started to enable a limiting disc to rotate, the outer gear rotates by 60 degrees, the measurement process (totally three M values) is repeated, measurement is finished, and the M value of the gear can be rapidly obtained.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of measuring instrument, concretely relates to gear M value measuring instrument. BACKGROUND

[0002] Gear is the transmission element commonly used in mechanical system, and its M value reflects the meshing precision and meshing state of gear, and accurate measurement of M value is very important for ensuring the normal operation of gear transmission system.

[0003] The traditional gear M value measurement method mainly uses physical means such as gear transmission device and high-speed rotation measurement contact angle, which usually needs complex instrument configuration, is cumbersome to operate, has insufficient measurement accuracy, and is difficult to realize rapid and convenient online measurement.

[0004] Therefore, the gear M value measuring instrument is proposed, which has high measurement accuracy and can realize rapid and portable online measurement. UTILITY MODEL CONTENTS

[0005] In order to overcome the problem of insufficient measurement accuracy of the existing gear M value measuring instrument and difficult to realize rapid and convenient online measurement, the gear M value measuring instrument is proposed.

[0006] The technical scheme of the utility model is as follows: the gear M value measuring instrument comprises a bottom plate; a servo moving mechanism is arranged at the upper end of the bottom plate, a moving plate is arranged on the servo moving mechanism, a moving block is fixedly connected to the lower end of the moving plate, a limiting disc is fixedly connected to the upper end of the moving block, an eccentric mechanism and a camera assembly are arranged at the left part of the upper end of the bottom plate, the servo moving mechanism is located behind the eccentric mechanism, the camera assembly is located in front of the eccentric mechanism, a computer is fixedly connected to the left edge of the upper end of the bottom plate, a length measuring sensor is fixedly connected to the right edge of the upper end of the bottom plate, a bottom disc is fixedly connected to the upper end of the limiting disc, a limiting column is fixedly connected to the upper end of the bottom disc, a second groove body is arranged at the lower end of the moving block, a second motor is fixedly connected to the top surface of the inner wall of the second groove body, and the output shaft of the second motor penetrates through the moving block and is fixedly connected to the lower end of the limiting disc.

[0007] A measuring mechanism is arranged at the upper end of the bottom plate, and the measuring mechanism comprises a support frame, a sliding table cylinder, a first fixed block, a measuring head, a first movable plate and a second movable plate; two support frames are fixedly connected to the upper end of the bottom plate, the support frames are fixedly connected with sliding table cylinders at the upper end, the output ends of the two sliding table cylinders are arranged opposite to each other, the first fixed blocks are fixedly connected to the upper end of the moving end of the sliding table cylinders, the measuring head is fixedly connected to one end of the two first fixed blocks close to each other, the first movable plate is fixedly connected to one end of the moving end of one of the sliding table cylinders close to the eccentric mechanism, and the second movable plate is fixedly connected to one end of the moving end of the other sliding table cylinder close to the eccentric mechanism.

[0008] Preferably, in use, the outer gear is placed on the upper end face of the chassis by the mechanical arm, then the servo moving mechanism is started to drive the moving plate and the moving block to move, the outer gear is pushed to the measuring position, the camera assembly is started to take pictures of the end face of the outer gear, and the pictures are analyzed by the computer, then the two facing slide table cylinders are started to make the two measuring heads approach each other, when the two measuring heads contact the outer tooth surface (in the tooth groove) of the gear, stop, the length measuring sensor is started, the values of the camera assembly are collected, the slide table cylinder is started again to drive the measuring heads to move in the opposite direction, the measuring heads are separated from the tooth surface, the second motor is started to make the limiting disc rotate, the outer gear rotates by 60 degrees, the above measuring process is repeated (a total of three M values), and the measurement is completed, the M value of the gear can be quickly obtained, and the problems of insufficient measuring accuracy of the existing gear M value measuring instrument and difficulty in realizing fast and convenient online measurement are solved.

[0009] Preferably, the servo moving mechanism comprises a servo motor, a screw body and a screw nut; the upper end of the bottom plate is fixedly connected with the servo motor, the right end of the output shaft of the servo motor is connected with the screw body through a shaft coupling, the side wall of the screw body is movably connected with the screw nut, and the upper end of the screw nut is fixedly connected with the lower end of the moving plate.

[0010] Preferably, the servo moving mechanism further comprises a bearing seat; the upper end of the bottom plate is fixedly connected with the bearing seat, and the inner wall of the bearing seat is attached to the side wall of the screw body.

[0011] Preferably, the lower end of the moving block is provided with two T-shaped grooves, and the upper end of the bottom plate is fixedly connected with two T-shaped blocks; the inner wall of the T-shaped groove is attached to the side wall of the T-shaped block.

[0012] Preferably, the camera assembly comprises a rotating cylinder, a supporting rod, a fixed plate, a mounting frame and a CCD camera; the upper end of the bottom plate is fixedly connected with the rotating cylinder, the upper end of the rotating end of the rotating cylinder is fixedly connected with the supporting rod, the upper end of the supporting rod is fixedly connected with the fixed plate, the side wall of the fixed plate is fixedly connected with the mounting frame, and the upper end of the mounting frame is fixedly connected with the CCD camera in a penetrating manner.

[0013] Preferably, the eccentric mechanism comprises a second fixed block, a first groove body, a first motor, a fixed ring and a first eccentric disc; the upper end of the left edge of the bottom plate is fixedly connected with the second fixed block, the upper end of the second fixed block is provided with the first groove body, the inner wall of the first groove body is fixedly connected with the first motor, the upper end of the second fixed block is fixedly connected with the fixed ring, the output shaft of the first motor extends above the fixed ring through the fixed ring, the side wall of the output shaft of the first motor is fixedly connected with the second eccentric disc and the first eccentric disc, the lower end of the first eccentric disc is attached to the upper end of the second eccentric disc, the height of the first movable plate is the same as the height of the second eccentric disc, and the height of the first eccentric disc is the same as the height of the second movable plate.

[0014] The upper end right edge of the base plate is fixedly connected with a vertical plate, the left end of the vertical plate is fixedly connected with a first telescopic belt, the left end of the first telescopic belt is fixedly connected with the right end of a moving block, the left end of the moving block is fixedly connected with a second telescopic belt, and the left end of the second telescopic belt is fixedly connected with the right end of a second fixed block.

[0015] The utility model discloses the beneficial effects of: utilize the mechanical hand to put the external gear to the upper end surface of chassis, then open servo moving mechanism and drive moving plate and moving block to remove, push the external gear into the measuring position, open the camera subassembly and take the external gear end surface picture, and through computer analysis, then open two facing and setting slide platform air cylinders and make two measuring heads close to each other, when two measuring heads contact the external gear (in the tooth groove) and stop, open the length measuring sensor, through the value of camera subassembly collection, open the slide platform air cylinder again and drive the opposite movement of measuring head, make measuring head separate and the contact of tooth surface, open the second motor again and make the limit disc rotate, make the external gear rotate sixty degrees, repeat the above measurement process (total: three M values), end measurement, can quickly obtain the M value of gear, solve the measurement accuracy of the insufficient of the gear M value measuring instrument of prior art, and difficult to realize the problem of quick, convenient online measurement. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model discloses the three -dimensional structure schematic diagram of gear M value measuring instrument of the utility model shows as the three -dimensional structure schematic diagram of gear M value measuring instrument of the utility model;

[0017] Figure 2 The utility model discloses the three -dimensional structure schematic diagram of camera subassembly of gear M value measuring instrument of the utility model shows as the three -dimensional structure schematic diagram of camera subassembly of gear M value measuring instrument of the utility model;

[0018] Figure 3 The utility model discloses the three -dimensional split structure schematic diagram of eccentric mechanism of gear M value measuring instrument of the utility model shows as the three -dimensional split structure schematic diagram of eccentric mechanism of gear M value measuring instrument of the utility model;

[0019] Figure 4 The utility model discloses the three -dimensional structure schematic diagram of servo moving mechanism of gear M value measuring instrument of the utility model shows as the three -dimensional structure schematic diagram of servo moving mechanism of gear M value measuring instrument of the utility model;

[0020] Figure 5 The utility model discloses the three -dimensional structure schematic diagram of moving block of gear M value measuring instrument of the utility model shows as the three -dimensional structure schematic diagram of moving block of gear M value measuring instrument of the utility model;

[0021] Figure 6 The utility model discloses the bottom view three -dimensional structure schematic diagram of moving block of gear M value measuring instrument of the utility model shows as the bottom view three -dimensional structure schematic diagram of moving block of gear M value measuring instrument of the utility model;

[0022] Figure 7 The utility model discloses the three -dimensional structure schematic diagram of measuring mechanism of gear M value measuring instrument of the utility model shows as the three -dimensional structure schematic diagram of measuring mechanism of gear M value measuring instrument of the utility model.

[0023] The marks in the drawings are: 1, bottom plate; 101, support frame; 102, sliding table air cylinder; 103, first fixed block; 104, measuring head; 105, first movable plate; 106, second movable plate; 2, servo moving mechanism; 201, servo motor; 202, screw body; 203, screw nut; 204, bearing seat; 3, moving plate; 4, moving block; 5, limiting disc; 501, bottom disc; 502, limiting column; 6, eccentric mechanism; 601, second fixed block; 602, first groove body; 603, first motor; 604, fixed ring; 605, first eccentric disc; 606, second eccentric disc; 7, camera assembly; 701, rotary air cylinder; 702, support rod; 703, fixed plate; 704, mounting frame; 705, CCD camera; 8, computer; 9, length measuring sensor; 10, T-shaped block; 11, first telescopic belt; 12, vertical plate; 13, second telescopic belt; 14, T-shaped groove; 15, second groove body; 16, second motor. DETAILED DESCRIPTION

[0024] The utility model is further explained below in combination with the drawings and embodiments.

[0025] Please refer to Figures 1-7 , the utility model provides a kind of embodiment: gear M value measuring instrument, including bottom plate 1;The upper end of bottom plate 1 is equipped with servo moving mechanism 2, and servo moving mechanism 2 is equipped with moving plate 3, and the lower end of moving plate 3 is fixedly connected with moving block 4, and the upper end of moving block 4 is fixedly connected with limiting disc 5, and the upper end left part of bottom plate 1 is provided with eccentric mechanism 6 and camera assembly 7, and servo moving mechanism 2 is located in the rear of eccentric mechanism 6, and camera assembly 7 is located in the front of eccentric mechanism 6, and the upper end left edge of bottom plate 1 is fixedly connected with computer 8, and the upper end right edge of bottom plate 1 is fixedly connected with length measuring sensor 9, and the upper end of limiting disc 5 is fixedly connected with bottom disc 501, and the upper end of bottom disc 501 is fixedly connected with limiting column 502, and the lower end of moving block 4 is equipped with second groove body 15, and the top surface of second groove body 15 inner wall is fixedly connected with second motor 16, and the upper end of the output shaft of second motor 16 passes through moving block 4 and is fixedly connected to the lower end of limiting disc 5;

[0026] The upper end of bottom plate 1 is equipped with measuring mechanism, and measuring mechanism includes support frame 101, sliding table air cylinder 102, first fixed block 103, measuring head 104, first movable plate 105 and second movable plate 106;The upper end of bottom plate 1 is fixedly connected with two support frames 101, and the upper end of support frame 101 is fixedly connected with sliding table air cylinder 102, and the output end of two sliding table air cylinders 102 is opposite and is equipped, and the upper end of the moving end of sliding table air cylinder 102 is fixedly connected with first fixed block 103, and one end of two first fixed blocks 103 is fixedly connected with measuring head 104, and one end of the moving end of one sliding table air cylinder 102 is fixedly connected with first movable plate 105, and one end of the moving end of another sliding table air cylinder 102 is fixedly connected with second movable plate 106.

[0027] In use, the mechanical arm is used to place the external gear on the upper end face of the chassis 501, and then the servo moving mechanism 2 is started to drive the moving plate 3 and the moving block 4 to move, so as to push the external gear into the measuring position. Then the camera assembly 7 is started to take a picture of the end face of the external gear, and the computer 8 is used to analyze the picture. Then the two facing slide table cylinders 102 are started to make the two measuring probes 104 approach each other, and stop when the two measuring probes 104 contact the tooth groove of the external gear. Then the length measuring sensor 9 is started to collect the value of the camera assembly 7, and then the slide table cylinder 102 is started again to drive the measuring probes 104 to move in the opposite direction, so as to make the measuring probes 104 separate from the tooth surface. Then the second motor 16 is started to drive the limiting disc 5 to rotate by 60 degrees, and the above measuring process is repeated three times to obtain the M value of the gear.

[0028] Please refer to Figure 1 and Figure 4 In this embodiment, the servo moving mechanism 2 comprises a servo motor 201, a screw body 202 and a screw nut 203. The upper end of the bottom plate 1 is fixedly connected with the servo motor 201. The right end of the output shaft of the servo motor 201 is connected with the screw body 202 through a shaft coupling. The side wall of the screw body 202 is movably connected with the screw nut 203. The upper end of the screw nut 203 is fixedly connected with the lower end of the moving plate 3. When the moving plate 3 needs to be moved, the servo motor 201 is started to drive the screw body 202 to rotate, and the screw nut 203 moves along the side wall of the screw body 202, thereby driving the moving plate 3 to move.

[0029] Please refer to Figure 1 and Figure 4 In this embodiment, the servo moving mechanism 2 further comprises a bearing seat 204. The upper end of the bottom plate 1 is fixedly connected with the bearing seat 204. The inner wall of the bearing seat 204 is in contact with the side wall of the screw body 202. The screw body 202 rotates along the inner wall of the bearing seat 204, thereby facilitating the stable rotation of the screw body 202.

[0030] Please refer to Figure 1 and Figure 6 In this embodiment, the lower end of the moving block 4 is provided with two T-shaped grooves 14. The upper end of the bottom plate 1 is fixedly connected with two T-shaped blocks 10. The inner wall of the T-shaped groove 14 is in contact with the side wall of the T-shaped block 10. When the moving block 4 moves, the T-shaped groove 14 moves along the side wall of the T-shaped block 10 stably.

[0031] Please refer to Figure 1 and Figure 2In the embodiment, the camera assembly 7 comprises a rotary air cylinder 701, a supporting rod 702, a fixed plate 703, a mounting frame 704 and a CCD camera 705. The rotary air cylinder 701 is fixed to the upper end of the bottom plate 1. The upper end of the rotating end of the rotary air cylinder 701 is fixedly connected with the supporting rod 702. The upper end of the supporting rod 702 is fixedly connected with the fixed plate 703. The side wall of the fixed plate 703 is fixedly connected with the mounting frame 704. The upper end of the mounting frame 704 is fixedly connected with the CCD camera 705 in a penetrating manner. In use, the rotary air cylinder 701 is turned on to rotate the rotating end, which drives the supporting rod 702 to rotate, so that the position of the CCD camera 705 is quickly adjusted. The CCD camera 705 is turned on to visually detect the outer gear end face. The CCD camera 705 shoots and transmits the picture to the computer 8 for detection, which is the prior art and will not be described in detail.

[0032] Please refer to Figure 1 and Figure 3 In the embodiment, the eccentric mechanism 6 comprises a second fixed block 601, a first groove body 602, a first motor 603, a fixed ring 604 and a first eccentric disc 605. The second fixed block 601 is fixed to the upper end of the left edge of the bottom plate 1. The first groove body 602 is arranged at the upper end of the second fixed block 601. The first motor 603 is fixed to the inner wall of the first groove body 602. The fixed ring 604 is fixed to the upper end of the second fixed block 601. The output shaft of the first motor 603 extends to above the fixed ring 604 through the fixed ring 604. The second eccentric disc 606 and the first eccentric disc 605 are fixed to the side wall of the output shaft of the first motor 603. The lower end of the first eccentric disc 605 is attached to the upper end of the second eccentric disc 606. The first eccentric disc 605 and the second eccentric disc 606 are driven to rotate by turning on the first motor 603. After the rotation of the first eccentric disc 605 and the second eccentric disc 606, the first eccentric disc 605 and the second eccentric disc 606 abut against one end of the first movable plate 105 and the second movable plate 106, which facilitates the stable detection of the two probes 104.

[0033] Please refer to Figure 1 , Figure 2 and Figure 7 In the embodiment, the height of the first movable plate 105 is the same as the height of the second eccentric disc 606, and the height of the first eccentric disc 605 is the same as the height of the second movable plate 106. When the first movable plate 105 and the second movable plate 106 approach each other, the first movable plate 105 abuts against the side wall of the second eccentric disc 606, and the second movable plate 106 abuts against the side wall of the first eccentric disc 605, which facilitates the limiting of the probes 104.

[0034] Please refer to Figure 1 , Figure 5 and Figure 6In the embodiment, the upright plate 12 is fixedly connected to the right edge of the upper end of the base plate 1, the first telescopic belt 11 is fixedly connected to the left end of the upright plate 12, the left end of the first telescopic belt 11 is fixedly connected to the right end of the moving block 4, the second telescopic belt 13 is fixedly connected to the left end of the moving block 4, and the left end of the second telescopic belt 13 is fixedly connected to the right end of the second fixed block 601.

[0035] Working principle: first, the mechanical hand is used to place the external gear on the upper end face of the chassis 501, and then the servo moving mechanism 2 is started to drive the moving plate 3 and the moving block 4 to move, so that the external gear is pushed into the measuring position.

[0036] Specifically, the servo motor 201 is started to drive the screw rod body 202 to rotate, the screw nut 203 moves along the side wall of the screw rod body 202, thereby driving the moving plate 3 to move.

[0037] Then the rotary cylinder 701 is started to rotate the rotating end, so that the support rod 702 is rotated, thereby quickly adjusting the position of the CCD camera 705, and the CCD camera 705 is started to perform visual detection on the end face of the external gear, and the CCD camera 705 is used to capture and transmit the picture to the computer 8 for detection, which is the prior art, and thus will not be described in detail.

[0038] The first motor 603 is started to drive the first eccentric disc 605 and the second eccentric disc 606 to rotate, and after the first eccentric disc 605 and the second eccentric disc 606 rotate, the first eccentric disc 605 and the second eccentric disc 606 abut against one end of the first movable plate 105 and the second movable plate 106, thereby facilitating stable detection of the two measuring heads 104.

[0039] Then, the two opposite slide table cylinders 102 are started to drive the two measuring heads 104 to approach each other, and when the two measuring heads 104 are in contact with the tooth groove on the external tooth surface of the gear and stop, the length measuring sensor 9 is started, the value of the camera assembly 7 is collected, the slide table cylinder 102 is started again to drive the measuring head 104 to move in the opposite direction, so that the measuring head 104 is separated from the tooth surface, the second motor 16 is started again to drive the limiting disc 5 to rotate, so that the external gear is rotated by 60 degrees, and the above measurement process is repeated three times, and the measurement is ended.

[0040] The embodiments of the utility model are described in detail above combined with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the purpose of the utility model.

Claims

1. A gear M value measuring instrument comprising a base plate (1); characterized in that: The upper end of the bottom plate (1) is provided with a servo moving mechanism (2), the servo moving mechanism (2) is provided with a moving plate (3), the lower end of the moving plate (3) is fixedly connected with a moving block (4), the upper end of the moving block (4) is fixedly connected with a limiting disc (5), the upper end of the left part of the bottom plate (1) is provided with an eccentric mechanism (6) and a camera assembly (7), the servo moving mechanism (2) is located behind the eccentric mechanism (6), the camera assembly (7) is located in front of the eccentric mechanism (6), the upper end of the left edge of the bottom plate (1) is fixedly connected with a computer (8), the upper end of the right edge of the bottom plate (1) is fixedly connected with a length measuring sensor (9), the upper end of the limiting disc (5) is fixedly connected with a bottom disc (501), the upper end of the bottom disc (501) is fixedly connected with a limiting column (502), the lower end of the moving block (4) is provided with a second groove (15), the top surface of the inner wall of the second groove (15) is fixedly connected with a second motor (16), the output shaft of the second motor (16) penetrates through the moving block (4) and is fixedly connected to the lower end of the limiting disc (5); The upper end of the bottom plate (1) is provided with a measuring mechanism, the measuring mechanism comprises a support frame (101), a sliding table air cylinder (102), a first fixed block (103), a measuring head (104), a first movable plate (105) and a second movable plate (106); the upper end of the bottom plate (1) is fixedly connected with two support frames (101), the upper end of the support frame (101) is fixedly connected with a sliding table air cylinder (102), the output ends of the two sliding table air cylinders (102) are opposite to each other, the upper end of the moving end of the sliding table air cylinder (102) is fixedly connected with a first fixed block (103), the first fixed block (103) is fixedly connected with a measuring head (104) at one end close to each other, one end of the moving end of one of the sliding table air cylinders (102) close to the eccentric mechanism (6) is fixedly connected with a first movable plate (105), one end of the moving end of the other sliding table air cylinder (102) close to the eccentric mechanism (6) is fixedly connected with a second movable plate (106).

2. The gear M-value measuring instrument according to claim 1, characterized by: The servo moving mechanism (2) comprises a servo motor (201), a lead screw body (202) and a lead screw nut (203); the upper end of the bottom plate (1) is fixedly connected with a servo motor (201), the right end of the output shaft of the servo motor (201) is provided with a lead screw body (202) through a shaft coupling, the side wall of the lead screw body (202) is movably installed with a lead screw nut (203), and the upper end of the lead screw nut (203) is fixedly connected to the lower end of the moving plate (3).

3. The gear M-value measuring instrument according to claim 2, characterized by: The servo moving mechanism (2) further comprises a bearing seat (204); the upper end of the bottom plate (1) is fixedly connected with a bearing seat (204), and the inner wall of the bearing seat (204) and the side wall of the lead screw body (202) are attached.

4. The gear M-value measuring instrument according to claim 1, characterized by: The lower end of the moving block (4) is provided with two T-shaped grooves (14), the upper end of the bottom plate (1) is fixedly connected with two T-shaped blocks (10), and the inner wall of the T-shaped groove (14) and the side wall of the T-shaped block (10) are attached.

5. The gear M-value measuring instrument according to claim 1, characterized by: The camera assembly (7) comprises a rotary air cylinder (701), a support rod (702), a fixed plate (703), a mounting frame (704) and a CCD camera (705); the upper end of the bottom plate (1) is fixedly connected with the rotary air cylinder (701), the upper end of the rotating end of the rotary air cylinder (701) is fixedly connected with the support rod (702), the upper end of the support rod (702) is fixedly connected with the fixed plate (703), the side wall of the fixed plate (703) is fixedly connected with the mounting frame (704), and the upper end of the mounting frame (704) is fixedly connected with the CCD camera (705) in a penetrating mode.

6. The gear M-value measuring instrument according to claim 1, characterized by: The eccentric mechanism (6) comprises a second fixed block (601), a first groove body (602), a first motor (603), a fixed ring (604) and a first eccentric disc (605); the upper end of the left edge of the bottom plate (1) is fixedly connected with the second fixed block (601), the upper end of the second fixed block (601) is provided with the first groove body (602), the inner wall of the first groove body (602) is fixedly connected with the first motor (603), the upper end of the second fixed block (601) is fixedly connected with the fixed ring (604), the output shaft of the first motor (603) penetrates through the fixed ring (604) and extends above the fixed ring (604), the side wall of the output shaft of the first motor (603) is fixedly connected with the second eccentric disc (606) and the first eccentric disc (605), the lower end of the first eccentric disc (605) is in abutment with the upper end of the second eccentric disc (606), the height of the first movable plate (105) is same as the height of the second eccentric disc (606), and the height of the first eccentric disc (605) is same as the height of the second movable plate (106).

7. The gear M-value measuring instrument according to claim 1, characterized by: The upper end of the right edge of the bottom plate (1) is fixedly connected with the stand plate (12), the left end of the stand plate (12) is fixedly connected with the first telescopic belt (11), the left end of the first telescopic belt (11) is fixedly connected with the right end of the moving block (4), the left end of the moving block (4) is fixedly connected with the second telescopic belt (13), and the left end of the second telescopic belt (13) is fixedly connected with the right end of the second fixed block (601).

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