A water heater heating pipe positioning fixture

Abstract

This invention relates to the field of positioning fixture technology, specifically a positioning fixture for a water heater heating tube. It includes a connecting plate, a connecting seat, a fixing structure, a driving structure, a lifting structure, a rotating structure, a heating tube body, and a supporting structure. During use, the heating tube base passes through the connecting plate, and the driving structure then drives the fixing structure to fix the heating tube base. Before the fixing structure contacts the heating tube base, it lifts the heating tube base via the lifting structure. The fixing structure then continues to move, securing the heating tube base. Therefore, when placing the heating tube body, it is not necessary to pass the bent metal tube on the heating tube through the connecting plate, effectively improving operational convenience. The heating tube body can also be disassembled and assembled simultaneously with welding, effectively shortening welding time and improving processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of positioning fixture technology, specifically a positioning fixture for a water heater heating tube. Background Technology

[0002] Water heater heating elements convert electrical energy into heat energy to heat the water in the tank, bringing the water inside to a suitable temperature. The water heater heating element mainly consists of a metal pipe, an electric heating wire located inside the metal pipe, and a heating element base for fixing the heating element. During the production process of the heating element, the heating element base needs to be fixed by a positioning fixture, and then the metal pipe and the heating element base are welded together.

[0003] However, traditional positioning clamps require the metal tube to pass through them when fixing the heating tube. Since the metal tube has a bent structure, it takes time to move the metal tube each time, which makes it inconvenient to quickly place and pick up the heating tube, resulting in poor ease of use. In addition, after each heating tube is welded, the machine needs to be stopped for a period of time for disassembly and installation, which makes it inconvenient to disassemble and install the heating tube while welding, thus increasing welding time and reducing processing efficiency. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a water heater heating tube positioning clamp.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a water heater heating tube positioning clamp, including a connecting plate, a connecting seat fixedly connected to the connecting plate, a support structure at the bottom end of the connecting seat, a rotating structure on the support structure, a fixing structure on the connecting plate, a driving structure on the connecting plate, a lifting structure on the connecting plate, and a heating tube body on the lifting structure;

[0006] The fixing structure includes a rotating ring and a first guide groove. Two rotating rings are rotatably connected to the connecting plate. The rotating rings are provided with four first guide grooves. Four sliders are provided on one side of the rotating rings. The sliders are slidably connected to the connecting plate. A first guide shaft is fixedly connected to the slider. One end of the first guide shaft extends into the interior of the first guide groove and is slidably connected to the slider. A stop block is fixedly connected to one end of the slider. The four stop blocks abut against the same heating tube body.

[0007] Specifically, the four first guide grooves are arranged in a circular array about the center of the rotating ring, and the cross-section between the slider and the abutment has an L-shaped structure.

[0008] Specifically, the connecting seat is located in the middle of the connecting plate, and the two rotating rings are symmetrically distributed about the middle of the connecting plate.

[0009] Specifically, the drive structure includes an electric push rod and a guide column. The guide column is fixedly connected to the connecting plate, and a slide block is slidably connected to the guide column. A rack is fixedly connected to one side of the slide block, and an incomplete gear is fixedly connected to the outer side of the rotating ring. The rack and the incomplete gear mesh with each other.

[0010] Specifically, an electric push rod is installed on the connecting plate, and the extended end of the electric push rod is fixedly connected to the slide block. The cross-section of the end of the slide block is L-shaped.

[0011] Specifically, the lifting structure includes a rotating shaft and drag blocks. The rotating shaft is provided on one side of the slider and is rotatably connected to the connecting plate. One end of the rotating shaft is fixedly connected to the drag blocks. The four drag blocks abut against the same heating tube body. The other end of the rotating shaft is fixedly connected to the connecting plate. A second guide shaft is fixedly connected to the connecting plate. The slider is provided with a second guide groove. One end of the second guide shaft extends into the interior of the second guide groove and is slidably connected to the slider. The connecting plate is provided with two storage slots.

[0012] Specifically, the direction of the two ends of the second guide groove is the same as the sliding direction of the slider, the direction of the middle part of the second guide groove has a certain angle with the sliding direction of the slider, and the cross section between the rotating shaft and the drag block has an L-shaped structure.

[0013] Specifically, the support structure includes a support frame and a rotating rod. The bottom end of the connecting plate is provided with a support frame, a lead screw is rotatably connected to the support frame, a connecting sleeve is threaded onto the lead screw, the connecting sleeve is slidably connected to the support frame, two guide strips are fixedly connected to the connecting sleeve, the guide strips are slidably connected to the support frame, a connecting seat is rotatably connected to the top end of the connecting sleeve, and a base plate is fixedly connected to the bottom end of the support frame. The base plate is provided with multiple mounting holes.

[0014] Specifically, a rotating rod is fixedly connected to the bottom end of the lead screw, and the rotating rod passes through the lead screw and is perpendicular to the lead screw.

[0015] Specifically, the rotating structure includes a mounting plate and a servo motor. The mounting plate is fixedly connected to the connecting sleeve, the servo motor is mounted on the mounting plate, a first synchronous pulley is fixedly connected to the output shaft of the servo motor, and a second synchronous pulley is fixedly connected to the connecting seat. A synchronous belt is wound between the first synchronous pulley and the second synchronous pulley.

[0016] The beneficial effects of this invention are:

[0017] The water heater heating tube positioning clamp of the present invention allows the heating tube base to pass through the connecting plate during use. Then, the driving structure drives the fixing structure to fix the heating tube base. Before the fixing structure contacts the heating tube base, the fixing structure will drive the lifting structure to lift the heating tube base. Then the fixing structure will continue to move to fix the heating tube base. Therefore, when placing the heating tube body, it is not necessary to pass the bent metal tube on the heating tube through the connecting plate, thereby effectively improving the convenience of operation.

[0018] (2) The water heater heating tube positioning clamp of the present invention can fix the other heating tube body when one heating tube body is being welded during use. After the welding of one heating tube body is completed, the connecting plate can be rotated through the rotating structure, thereby realizing the exchange of the positions of the two heating tube bodies. Thus, the heating tube body can be disassembled and assembled at the same time as welding, thereby effectively shortening the welding time and improving the processing efficiency.

[0019] (3) The water heater heating tube positioning clamp of the present invention can support the connecting plate through the support structure, and the height of the connecting plate can be adjusted through the support structure, so as to facilitate the adaptation to welding devices of different heights and thus effectively improve the flexibility of use. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of a water heater heating tube positioning clamp provided by the present invention;

[0022] Figure 2 for Figure 1 The enlarged schematic diagram of part A shown below;

[0023] Figure 3 This is a schematic diagram of the connection structure between the connecting frame and the card slot of the present invention;

[0024] Figure 4 for Figure 3 The enlarged schematic diagram of section B is shown below;

[0025] Figure 5 This is a schematic diagram of the connection structure between the lead screw and the connecting sleeve of the present invention;

[0026] Figure 6 for Figure 5 The enlarged schematic diagram of section C is shown below;

[0027] Figure 7 This is a schematic diagram of the connection structure between the slider and the second guide groove of the present invention;

[0028] Figure 8 This is a schematic diagram of the connection structure between the connecting piece and the second guide shaft of the present invention.

[0029] In the diagram: 1. Connecting plate; 2. Connecting seat; 3. Fixing structure; 301. Rotary ring; 302. First guide groove; 303. First guide shaft; 304. Slider; 305. Abutment; 4. Driving structure; 401. Electric push rod; 402. Guide column; 403. Slide; 404. Rack; 405. Incomplete gear; 5. Lifting structure; 501. Rotating shaft; 502. Driving block; 503. Connecting piece; 504. Second guide shaft; 505, second guide groove; 506, storage groove; 6, rotating structure; 601, mounting plate; 602, servo motor; 603, first synchronous pulley; 604, synchronous belt; 605, second synchronous pulley; 7, heating tube body; 8, support structure; 801, support frame; 802, rotating rod; 803, lead screw; 804, connecting sleeve; 805, guide strip; 806, base plate; 807, mounting hole. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the water heater heating tube positioning clamp of the present invention includes a connecting plate 1, a connecting seat 2 fixedly connected to the connecting plate 1, a support structure 8 at the bottom end of the connecting seat 2, a rotating structure 6 on the support structure 8, a fixing structure 3 on the connecting plate 1, a driving structure 4 on the connecting plate 1, a lifting structure 5 on the connecting plate 1, and a heating tube body 7 on the lifting structure 5.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the fixing structure 3 includes a rotating ring 301 and a first guide groove 302. Two rotating rings 301 are rotatably connected to the connecting plate 1. Each rotating ring 301 has four first guide grooves 302. Four sliders 304 are provided on one side of each rotating ring 301. The sliders 304 are slidably connected to the connecting plate 1. A first guide shaft 303 is fixedly connected to each slider 304. One end of the first guide shaft 303 extends into the interior of the first guide groove 302 and is slidably connected to the slider 304. A stop block 305 is fixedly connected to one end of each slider 304. The four stop blocks 305 abut against the same heating tube body 7. The four first guide grooves 302 are arranged in a circular array about the center of the rotating ring 301. The cross-section between 304 and the abutment 305 is L-shaped. The connecting seat 2 is located in the middle of the connecting plate 1. The two rotating rings 301 are symmetrically distributed about the middle of the connecting plate 1. The driving structure 4 includes an electric push rod 401 and a guide post 402. The guide post 402 is fixedly connected to the connecting plate 1. A slide block 403 is slidably connected to the guide post 402. A rack 404 is fixedly connected to one side of the slide block 403. An incomplete gear 405 is fixedly connected to the outer side of the rotating ring 301. The rack 404 meshes with the incomplete gear 405. An electric push rod 401 is installed on the connecting plate 1. The extended end of the electric push rod 401 is fixedly connected to the slide block 403. The cross-section of the end of the slide block 403 is L-shaped. The lifting structure 5 includes a rotating shaft 501 and drag blocks 502. The rotating shaft 501 is located on one side of the slider 304 and is rotatably connected to the connecting plate 1. One end of the rotating shaft 501 is fixedly connected to a drag block 502. Four drag blocks 502 abut against the same heating tube body 7. The other end of the rotating shaft 501 is fixedly connected to a connecting piece 503. A second guide shaft 504 is fixedly connected to the connecting piece 503. The slider 304 has a second guide groove 505. One end of the second guide shaft 504 extends into the second guide groove 505 and is slidably connected to the slider 304. The connecting plate 1 has two receiving slots 506. The direction of the two ends of the second guide groove 505 is consistent with that of the slider 304. The sliding directions of 04 are the same. The direction of the middle part of the second guide groove 505 and the sliding direction of the slider 304 have a certain angle. The cross-section between the rotating shaft 501 and the drag block 502 is L-shaped. That is, when it is necessary to fix the heating tube body 7, the heating tube body 7 can be held and moved, and the heating tube base at the end of the heating tube body 7 can be passed through the connecting plate 1. Then, the electric push rod 401 can be activated. The extension of the electric push rod 401 will drive the slide 403 to slide on the guide post 402. The movement of the slide 403 will drive the rack 404 to move. The rack 404 will drive the incomplete gear 405 to rotate. The incomplete gear 405 will drive the rotating ring 301 to rotate. The rotating ring 301 will drive the multiple first guide grooves 302 to rotate.While the first guide groove 302 moves, the first guide shaft 303 moves inside the first guide groove 302. Simultaneously, the slider 304 slides on the connecting plate 1. The movement of the slider 304 drives the abutment 305 to move, causing all four abutments 305 to move towards the heating tube body 7 simultaneously. Simultaneously, the slider 304 drives the second guide groove 505 to move. Simultaneously, the second guide shaft 504 moves inside the second guide groove 505. When the second guide shaft 504 reaches the inclined position in the middle of the second guide groove 505, the connecting piece 503 rotates as the second guide shaft 504 continues to move inside the second guide groove 505. Rotation 3 will cause the rotating shaft 501 to rotate, which in turn will cause the drag block 502 to rotate. When the drag block 502 rotates 90 degrees, the second guide shaft 504 will move to the horizontal position of the second guide groove 505. At this time, the heating tube body 7 can be released. After the heating tube body 7 is released, it can be supported by multiple drag blocks 502. Then, the slider 304 will continue to move, causing the abutment block 305 to move towards the heating tube body 7. When all four abutment blocks 305 simultaneously contact the heating tube body 7, the electric push rod 401 stops extending. At this time, the positioning and fixing of the heating tube body 7 is achieved. Since it is not necessary to pass the bent metal tube on the heating tube through the connecting plate 1 when placing the heating tube body 7, the convenience of operation is effectively improved.

[0033] Specifically, such as Figure 1 and Figure 5As shown, the support structure 8 includes a support frame 801 and a rotating rod 802. The bottom end of the connecting plate 1 is provided with the support frame 801. A lead screw 803 is rotatably connected to the support frame 801. A connecting sleeve 804 is threaded onto the lead screw 803. The connecting sleeve 804 is slidably connected to the support frame 801. Two guide strips 805 are fixedly connected to the connecting sleeve 804. The guide strips 805 are slidably connected to the support frame 801. A connecting seat 2 is rotatably connected to the top end of the connecting sleeve 804. A base plate 806 is fixedly connected to the bottom end of the support frame 801. The base plate 806 is provided with multiple mounting holes 807. The bottom end of the lead screw 803 is fixedly connected with the rotating rod 802. The rotating rod 802 passes through the lead screw 803 and is between the lead screw 803 and the lead screw 802. Vertically, meaning that during use, the base plate 806 can be installed and fixed by bolts through multiple mounting holes 807, thereby fixing the device. When the height of the connecting plate 1 needs to be adjusted, the screw 803 can be rotated by the rotating rod 802. Since two guide bars 805 are fixedly connected to both ends of the connecting sleeve 804, the connecting sleeve 804 can be prevented from rotating, while allowing the connecting sleeve 804 to slide in its axial direction. Therefore, when the screw 803 rotates, it can drive the connecting sleeve 804 to slide on the support frame 801. The movement of the connecting sleeve 804 will drive the connecting seat 2 to move, and the movement of the connecting seat 2 will drive the connecting plate 1 to move, thereby realizing the adjustment of the height of the connecting plate 1. This is convenient for adapting to welding devices of different heights, thus effectively improving the flexibility of use.

[0034] Specifically, such as Figure 1 and Figure 2 As shown, the rotating structure 6 includes a mounting plate 601 and a servo motor 602. The mounting plate 601 is fixedly connected to the connecting sleeve 804, and the servo motor 602 is mounted on the mounting plate 601. A first synchronous pulley 603 is fixedly connected to the output shaft of the servo motor 602, and a second synchronous pulley 605 is fixedly connected to the connecting seat 2. A synchronous belt 604 is wound between the first synchronous pulley 603 and the second synchronous pulley 605. That is, during use, when one heating tube body 7 is being welded, the other heating tube body 7 can be fixed, and when one heating tube body... 7. After welding is completed, the servo motor 602 is started. The output shaft of the servo motor 602 rotates, which drives the first synchronous pulley 603 to rotate. The first synchronous pulley 603 drives the second synchronous pulley 605 to rotate through the synchronous belt 604. The rotation of the second synchronous pulley 605 drives the connecting seat 2 to rotate. The rotation of the connecting seat 2 drives the connecting plate 1 to rotate. When the connecting plate 1 rotates 180 degrees, the output shaft of the servo motor 602 stops rotating. At this time, the positions of the two heating tube bodies 7 are swapped, so that the heating tube bodies 7 can be disassembled and assembled at the same time as welding, thereby effectively shortening the welding time and improving the processing efficiency.

[0035] In use, the base plate 806 can be installed and fixed by bolts through multiple mounting holes 807, thereby fixing the device. When the height of the connecting plate 1 needs to be adjusted, the screw 803 can be rotated by the rotating rod 802. Since two guide strips 805 are fixedly connected to both ends of the connecting sleeve 804, the connecting sleeve 804 can be prevented from rotating, while allowing the connecting sleeve 804 to slide in its axial direction. Therefore, when the screw 803 rotates, it can drive the connecting sleeve 804 to slide on the support frame 801. The movement of the connecting sleeve 804 will drive the connecting seat 2 to move, and the movement of the connecting seat 2 will drive the connecting plate 1 to move, thereby realizing the adjustment of the height of the connecting plate 1. This is convenient for adapting to welding devices of different heights, thus effectively improving the flexibility of use.

[0036] During use, when one heating tube body 7 is being welded, the other heating tube body 7 can be fixed. When it is necessary to fix the heating tube body 7, the heating tube body 7 can be held and moved, and the heating tube base at the end of the heating tube body 7 can be passed through the connecting plate 1. Then, the electric push rod 401 can be activated. The electric push rod 401 extends and drives the slide 403 to slide on the guide post 402. The movement of the slide 403 drives the rack 404 to move. The rack 404 drives the incomplete gear 405 to rotate. The incomplete gear 405 drives the rotating ring 301 to rotate. The rotating ring 301 drives the multiple first guide grooves 302 to rotate. At the same time as the first guide grooves 302 move, the first... The guide shaft 303 moves inside the first guide groove 302. Simultaneously, the slider 304 slides on the connecting plate 1. The movement of the slider 304 drives the abutment 305 to move, causing all four abutments 305 to move towards the heating tube body 7 simultaneously. The slider 304's movement also drives the second guide groove 505 to move. Simultaneously, the second guide shaft 504 moves inside the second guide groove 505. When the second guide shaft 504 reaches the inclined position in the middle of the second guide groove 505, the connecting piece 503 rotates as the second guide shaft 504 continues to move within the second guide groove 505. Rotation of 503 will drive rotation of shaft 501, which in turn will drive rotation of drag block 502. When drag block 502 rotates 90 degrees, the second guide shaft 504 will move to the horizontal position of the second guide groove 505. At this point, the heating tube body 7 can be released. After the heating tube body 7 is released, it can be supported by multiple drag blocks 502. Then, slider 304 will continue to move, driving the abutment block 305 towards the heating tube body 7. When all four abutment blocks 305 simultaneously contact the heating tube body 7, the electric push rod 401 stops extending. This achieves the positioning and fixation of the heating tube body 7. Since it is not necessary to pass the bent metal tube on the heating tube when placing the heating tube body 7, By using the connecting plate 1, the ease of operation is effectively improved. After one of the heating tube bodies 7 is welded, the servo motor 602 is started. The output shaft of the servo motor 602 rotates, driving the first synchronous pulley 603 to rotate. The first synchronous pulley 603 drives the second synchronous pulley 605 to rotate via the synchronous belt 604. The rotation of the second synchronous pulley 605 drives the connecting seat 2 to rotate. The rotation of the connecting seat 2 drives the connecting plate 1 to rotate. When the connecting plate 1 rotates 180 degrees, the output shaft of the servo motor 602 stops rotating. At this time, the positions of the two heating tube bodies 7 are swapped, so that the assembly and disassembly of the heating tube bodies 7 can be achieved at the same time as welding, thereby effectively shortening the welding time and improving the processing efficiency.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A positioning clamp for a water heater heating element, characterized in that, Includes a connecting plate (1), a connecting seat (2) fixedly connected to the connecting plate (1), a support structure (8) provided at the bottom end of the connecting seat (2), a rotating structure (6) provided on the support structure (8), a fixing structure (3) provided on the connecting plate (1), a driving structure (4) provided on the connecting plate (1), a lifting structure (5) provided on the connecting plate (1), and a heating tube body (7) provided on the lifting structure (5). The fixed structure (3) includes a rotating ring (301) and a first guide groove (302). Two rotating rings (301) are rotatably connected to the connecting plate (1). The rotating rings (301) are provided with four first guide grooves (302). Four sliders (304) are provided on one side of the rotating rings (301). The sliders (304) are slidably connected to the connecting plate (1). A first guide shaft (303) is fixedly connected to the sliders (304). One end of the first guide shaft (303) extends into the interior of the first guide groove (302) and is slidably connected to the sliders (304). One end of the sliders (304) is fixedly connected to a stop block (305). The four stop blocks (305) abut against the same heating tube body (7). The lifting structure (5) includes a rotating shaft (501) and drag blocks (502). The rotating shaft (501) is provided on one side of the slider (304). The rotating shaft (501) is rotatably connected to the connecting plate (1). One end of the rotating shaft (501) is fixedly connected to the drag blocks (502). The four drag blocks (502) abut against the same heating tube body (7). The other end of the rotating shaft (501) is fixedly connected to the connecting piece (503). A second guide shaft (504) is fixedly connected to the connecting piece (503). The slider (304) The connecting plate (1) is provided with a second guide groove (505), one end of the second guide shaft (504) extends into the interior of the second guide groove (505) and is slidably connected to the slider (304). The connecting plate (1) is provided with two storage grooves (506). The direction of the two ends of the second guide groove (505) is the same as the sliding direction of the slider (304). The direction of the middle part of the second guide groove (505) and the sliding direction of the slider (304) have a certain angle. The cross section between the rotating shaft (501) and the drag block (502) is L-shaped.

2. The water heater heating tube positioning clamp according to claim 1, characterized in that: The four first guide grooves (302) are arranged in a circular array about the center of the rotating ring (301), and the cross section between the slider (304) and the abutment (305) is L-shaped.

3. A water heater heating tube positioning clamp according to claim 1, characterized in that: The connecting seat (2) is located in the middle of the connecting plate (1), and the two rotating rings (301) are symmetrically distributed about the middle of the connecting plate (1).

4. A water heater heating tube positioning clamp according to claim 1, characterized in that: The drive structure (4) includes an electric push rod (401) and a guide post (402). The guide post (402) is fixedly connected to the connecting plate (1). A slide block (403) is slidably connected to the guide post (402). A rack (404) is fixedly connected to one side of the slide block (403). An incomplete gear (405) is fixedly connected to the outer side of the rotating ring (301). The rack (404) meshes with the incomplete gear (405).

5. A water heater heating tube positioning clamp according to claim 4, characterized in that: An electric push rod (401) is installed on the connecting plate (1). The extended end of the electric push rod (401) is fixedly connected to the slide (403). The cross-section of the end of the slide (403) is L-shaped.

6. A water heater heating tube positioning clamp according to claim 1, characterized in that: The support structure (8) includes a support frame (801) and a rotating rod (802). The bottom end of the connecting plate (1) is provided with a support frame (801). A lead screw (803) is rotatably connected to the support frame (801). A connecting sleeve (804) is threaded onto the lead screw (803). The connecting sleeve (804) is slidably connected to the support frame (801). Two guide bars (805) are fixedly connected to the connecting sleeve (804). The guide bars (805) are slidably connected to the support frame (801). A connecting seat (2) is rotatably connected to the top end of the connecting sleeve (804). A base plate (806) is fixedly connected to the bottom end of the support frame (801). The base plate (806) is provided with multiple mounting holes (807).

7. A water heater heating tube positioning clamp according to claim 6, characterized in that: A rotating rod (802) is fixedly connected to the bottom end of the lead screw (803). The rotating rod (802) passes through the lead screw (803) and is perpendicular to the lead screw (803).

8. A water heater heating tube positioning clamp according to claim 6, characterized in that: The rotating structure (6) includes a mounting plate (601) and a servo motor (602). The mounting plate (601) is fixedly connected to the connecting sleeve (804). The servo motor (602) is mounted on the mounting plate (601). A first synchronous pulley (603) is fixedly connected to the output shaft of the servo motor (602). A second synchronous pulley (605) is fixedly connected to the connecting seat (2). A synchronous belt (604) is wound between the first synchronous pulley (603) and the second synchronous pulley (605).

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