Adjustable support for volute type fan

Abstract

The invention provides an adjustable support for a volute fan, and relates to the technical field of fan supports. Two X-shaped movable frames are installed on the top of the fixed bottom frame base in a bilateral symmetry mode, two lower connecting rods are installed in the fixed bottom frame base, and the lower connecting rods are connected with the X-shaped movable frames. The tops of the X-shaped movable frames are connected with a movable top frame seat, the movable top frame seat is connected with the two X-shaped movable frames, and two upper connecting rods are installed in the movable top frame seat. According to different installation heights required by the volute type fan, the two lower connecting rods can be driven to move through the two-way screw rod, the lower connecting rods drive the movable top frame base to move through the X-shaped movable frame, the height of the supporting upper base is changed, and the installation and use requirements of the volute type fans with different heights can be better met. The problems that an existing support for the volute type draught fan is mostly designed in an integrated mode, all parts are fixed in a welding mode, and the support can only meet the requirement for supporting the volute type draught fan in the specific height state are solved.

Description

Technical Field

[0001] The invention relates to the technical field of fan brackets, and in particular to an adjustable bracket for a volute type fan. Background Art

[0002] A centrifugal fan is an air supply mechanism that uses a motor to drive the centrifugal fan wheel to rotate at high speed. The air in the volute is thrown out from the volute outlet under the action of centrifugal force. At the same time, negative pressure is generated around the centrifugal fan wheel due to the air being thrown out, so that the external air is sucked into the volute from the volute inlet. This process is repeated continuously. The volute fan needs to be supported by a bracket when in use.

[0003] For example, the Chinese patent "CN111089084B Fan Mounting Bracket and Fan Assembly" states that the fan mounting bracket includes: a mounting base plate and a side support assembly; wherein the side support assembly includes two side support blocks spaced apart along the front-to-rear direction or the left-to-right direction of the mounting base plate, the side support blocks extending upward from the mounting base plate to support the fan installed between the side support blocks, and the side support blocks are also provided with front-to-rear limiting structures and left-to-right limiting structures for limiting the position of the fan; a new type of fan mounting bracket with a novel and simple structure that is convenient for the fan to be plugged in up and down is provided, thereby making the installation operation of the fan more convenient.

[0004] Currently, most of the existing brackets for volute fans adopt an integrated design, and the components are fixed by welding. They can only be used to support volute fans at a specific height and position, and cannot be adaptively adjusted according to the installation height and installation position of the volute fan, so their use is limited. Summary of the invention

[0005] The present disclosure relates to an adjustable bracket for a volute fan, which solves the problem that the existing brackets for volute fans mostly adopt an integrated design, and the components are fixed by welding. The brackets can only be used to support the volute fan at a specific height and a specific position, and cannot be adaptively adjusted according to the different installation heights and installation positions of the volute fan, thus having limitations in use.

[0006] The first aspect of the present disclosure provides an adjustable bracket for a volute type fan, specifically comprising: a fixed bottom frame seat; two X-shaped movable frames are installed on the top of the fixed bottom frame seat in a left-right symmetrical shape, and two lower connecting rods are installed inside the fixed bottom frame seat, and the lower connecting rods are connected to the X-shaped movable frame; the top of the X-shaped movable frame is connected to a movable top frame seat, and the movable top frame seat is connected to the two X-shaped movable frames, and two upper connecting rods are installed in the movable top frame seat, and the upper connecting rods are connected to the X-shaped movable frame; a two-way screw is connected inside the fixed bottom frame seat, and the two-way screw is connected to the two lower connecting rods; a docking lower seat is installed on the top of the movable top frame seat, and a supporting upper seat is installed on the top of the docking lower seat, and the volute type fan is fixedly installed on the top of the supporting upper seat; the bottom of the docking lower seat is groove-shaped, and two rotating parts are installed in the bottom of the docking lower seat in a left-right symmetrical shape, and three transmission connecting rods are connected to the outside of the rotating part, and the end of the transmission connecting rod is connected with a positioning movable pin, and the positioning movable pin is connected to the docking lower seat and the movable top frame seat.

[0007] Furthermore, the fixed bottom frame seat is provided with lower sliding holes on the front and rear sides, and the end of the lower connecting rod is slidably connected in the lower sliding hole. The movable top frame seat is provided with upper sliding holes on the front and rear sides, and the end of the upper connecting rod is slidably connected in the upper sliding hole.

[0008] Furthermore, one end of the bottom of the X-shaped movable frame is rotatably connected to the fixed bottom frame seat, the other end of the bottom of the X-shaped movable frame is rotatably connected to the lower connecting rod, one end of the top of the X-shaped movable frame is rotatably connected to the movable top frame seat, and the other end of the top of the X-shaped movable frame is rotatably connected to the upper connecting rod.

[0009] Furthermore, a screw hole is provided inside the lower connecting rod, and the bidirectional screw is rotatably connected to the fixed bottom frame seat. The bidirectional screw is threadedly connected to the screw holes provided in the two lower connecting rods. By rotating the bidirectional screw, the two lower connecting rods are driven by the bidirectional screw to move, thereby changing the distance between the two lower connecting rods. The lower connecting rod drives the movable top frame seat to move through the X-shaped movable frame, thereby changing the height between the movable top frame seat and the fixed bottom frame seat, thereby changing the height of the supporting upper seat.

[0010] Furthermore, the top of the docking lower seat is groove-shaped, the bottom of the supporting upper seat is located inside the top of the docking lower seat, two side sliding holes A are provided on the front and rear sides of the docking lower seat, and two screws A are provided on the front and rear sides of the bottom of the supporting upper seat, and the screws A are movably connected in the side sliding holes A.

[0011] Furthermore, side sliding holes B are provided on the left and right sides of the docking lower seat, and screws B are provided on the left and right sides of the bottom of the supporting upper seat. The screw B is movably connected in the side sliding hole B, the external thread of the screw A is connected to the limiting nut, and the external thread of the screw B is connected to the limiting nut. The limiting nut contacts the outer side of the docking lower seat. The supporting upper seat can be fine-tuned by moving forward, backward, left and right according to the required installation position of the volute fan to better meet the installation requirements of the volute fan in different positions, and the limiting nuts are tightened in turn to fix the supporting upper seat through the limiting nuts.

[0012] Furthermore, the bottom of the docking lower seat is inserted into the top of the movable top frame seat, the outer periphery of the movable top frame seat is provided with an external connecting hole in a surrounding shape, the bottom of the docking lower seat is provided with an internal connecting hole in a surrounding shape, the internal connecting hole is connected to the external connecting hole, the positioning movable pin is inserted into the connected internal connecting hole and external connecting hole, and the bottom of the positioning movable pin is inclined.

[0013] Furthermore, the rotating member is rotatably connected to the docking lower seat, one end of the transmission connecting rod is rotatably connected to the positioning movable pin, and the other end of the transmission connecting rod is rotatably connected to the rotating member. A movable hole is provided on the outside of the rotating member, and a fixed hole is provided in the bottom of the docking lower seat. One end of the reset spring is connected to the movable hole, and the other end of the reset spring is connected to the fixed hole. When the bottom of the docking lower seat is inserted into the top of the movable top frame seat, the inner connecting hole and the outer connecting hole are connected, and the rotating member rotates and resets under the influence of the tension of the reset spring. The rotating member drives the positioning movable pin to move outward through the transmission connecting rod, so that the end of the positioning movable pin is inserted into the outer connecting hole, which has a firm effect on the connection between the docking lower seat and the movable top frame seat.

[0014] The present invention provides an adjustable bracket for a volute-type fan, which has the following beneficial effects: When the present invention is in use, the bidirectional screw can be rotated according to the different required installation heights of the volute fan, and the bidirectional screw drives the two lower connecting rods to move, thereby changing the spacing distance between the two lower connecting rods. The lower connecting rod drives the movable top frame seat to move through the X-shaped movable frame, and changes the spacing height between the movable top frame seat and the fixed bottom frame seat, thereby changing the height of the support upper seat, which is better suitable for the installation and use requirements of volute fans of different heights; the support upper seat can also be fine-tuned by moving forward, backward, left and right according to the different required installation positions of the volute fan, so as to better meet the installation requirements of volute fans in different positions, and the limit nuts can be tightened in turn to fix the support upper seat through the limit nuts to ensure the stability of the operating state of the volute fan.

[0015] In addition, when the bottom of the docking lower seat is inserted into the top of the movable top frame seat, the inner connecting hole and the outer connecting hole are connected, and the rotating part rotates and resets under the influence of the tension of the reset spring. The rotating part drives the positioning movable pin to move outward through the transmission connecting rod, so that the end of the positioning movable pin is inserted into the outer connecting hole, thereby ensuring the firmness of the connection between the docking lower seat and the movable top frame seat, making the bracket assembly easier; when the docking lower seat and the movable top frame seat need to be separated, it is only necessary to press the positioning movable pin inward with a screwdriver to separate the end of the positioning movable pin from the outer connecting hole, and the positioning movable pin drives the rotating part to rotate in the opposite direction through the transmission connecting rod. The reset tension spring is in a stretched state, and the docking lower seat can be pulled upward to separate the docking lower seat from the movable top frame seat, making the bracket disassembly and assembly easier.

[0016] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0018] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] In the attached picture: Figure 1 The schematic diagram of the overall left front axle structure of the adjustable bracket of the present application is shown; Figure 2 A schematic diagram of the disassembly structure of the movable top frame seat and the docking lower seat of the adjustable bracket of the present application is shown; Figure 3 A schematic diagram of the connection structure of the fixed bottom frame seat, the X-shaped movable frame and the movable top frame seat of the adjustable bracket of the present application is shown; Figure 4 A schematic diagram of the connection structure of the X-shaped movable frame, the lower connecting rod and the upper connecting rod of the adjustable bracket of the present application is shown; Figure 5 A schematic diagram of the split structure of the lower docking seat and the upper supporting seat of the adjustable bracket of the present application is shown; Figure 6 A schematic diagram of the installation structure of the bottom rotating member of the docking lower seat of the adjustable bracket of the present application is shown; Figure 7 A schematic diagram of the bottom shaft side structure of the docking lower seat of the adjustable bracket of the present application is shown; Figure 8 A schematic diagram of the connection structure of the rotating member, the positioning movable pin, the transmission connecting rod and the reset tension spring of the adjustable bracket of the present application is shown.

[0020] Reference numerals list 1. Fixed bottom frame seat; 101. Lower sliding hole; 2. X-shaped movable frame; 3. Movable top frame seat; 301. Upper sliding hole; 302. External connecting hole; 4. Lower connecting rod; 401. Screw hole; 5. Upper connecting rod; 6. Bidirectional screw; 7. Docking lower seat; 701. Side sliding hole A; 702. Side sliding hole B; 703. Internal connecting hole; 704. Fixed hole; 8. Support upper seat; 801. Screw A; 802. Screw B; 9. Limit nut; 10. Rotating part; 1001. Moving hole; 11. Positioning movable pin; 12. Transmission connecting rod; 13. Reset tension spring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1 to 8 : The present invention proposes an adjustable bracket for a volute-type fan, comprising: a fixed bottom frame seat 1; two X-shaped movable frames 2 are installed on the top of the fixed bottom frame seat 1 in a bilaterally symmetrical shape, two lower connecting rods 4 are installed inside the fixed bottom frame seat 1, and the lower connecting rods 4 are connected to the X-shaped movable frames 2; a movable top frame seat 3 is connected to the top of the X-shaped movable frames 2, and the movable top frame seat 3 is connected to the two X-shaped movable frames 2, and two upper connecting rods 5 are installed in the movable top frame seat 3, and the upper connecting rods 5 are connected to the X-shaped movable frames 2; a bidirectional screw 6 is connected inside the fixed bottom frame seat 1, The bidirectional screw 6 is connected to the two lower connecting rods 4; a docking lower seat 7 is installed on the top of the movable top frame seat 3, a supporting upper seat 8 is installed on the top of the docking lower seat 7, and the volute fan is fixedly installed on the top of the supporting upper seat 8; the bottom of the docking lower seat 7 is groove-shaped, and two rotating parts 10 are installed in the bottom of the docking lower seat 7 in a left-right symmetrical shape, and three transmission connecting rods 12 are connected to the outside of the rotating part 10, and the end of the transmission connecting rod 12 is connected to a positioning movable pin 11, which is connected to the docking lower seat 7 and the movable top frame seat 3; the front and rear sides of the fixed bottom frame seat 1 A lower sliding hole 101 is provided, and the end of the lower connecting rod 4 is slidably connected in the lower sliding hole 101. Upper sliding holes 301 are provided on the front and rear sides of the movable top frame seat 3, and the end of the upper connecting rod 5 is slidably connected in the upper sliding hole 301; one end of the bottom of the X-shaped movable frame 2 is rotatably connected to the fixed bottom frame seat 1, the other end of the bottom of the X-shaped movable frame 2 is rotatably connected to the lower connecting rod 4, one end of the top of the X-shaped movable frame 2 is rotatably connected to the movable top frame seat 3, and the other end of the top of the X-shaped movable frame 2 is rotatably connected to the upper connecting rod 5; a screw hole 401 is provided inside the lower connecting rod 4, and a bidirectional screw 6 is rotatably connected to the fixed bottom frame seat 1, and the bidirectional screw 6 is threadedly connected to the screw holes 401 provided in the two lower connecting rods 4. According to the different installation heights required for the volute type fan, the bidirectional screw 6 can be rotated, and the bidirectional screw 6 drives the two lower connecting rods 4 to move, thereby changing the spacing distance between the two lower connecting rods 4. The lower connecting rod 4 drives the movable top frame seat 3 to move through the X-shaped movable frame 2, and changes the spacing height between the movable top frame seat 3 and the fixed bottom frame seat 1, thereby changing the height of the supporting upper seat 8, which is better suitable for the installation and use requirements of volute type fans of different heights.

[0023] In the disclosed embodiment, the top of the docking lower seat 7 is groove-shaped, the bottom of the supporting upper seat 8 is located inside the top of the docking lower seat 7, two side sliding holes A701 are provided on the front and rear sides of the docking lower seat 7, two screws A801 ​​are provided on the front and rear sides of the bottom of the supporting upper seat 8, the screws A801 ​​are movably connected in the side sliding holes A701, side sliding holes B702 are provided on the left and right sides of the docking lower seat 7, screws B802 are provided on the left and right sides of the bottom of the supporting upper seat 8, the screws B802 are movably connected in the side sliding holes B702, the external thread of the screw A801 ​​is connected to the limiting nut 9, the external thread of the screw B802 is connected to the limiting nut 9, and the limiting nut 9 is in contact with the outer side of the docking lower seat 7; By adopting the above technical solution, the support upper seat 8 can be moved forward, backward, left and right for fine adjustment according to the different required installation positions of the volute fan to better meet the installation requirements of the volute fan in different positions, and the limit nuts 9 can be tightened in turn to fix the support upper seat 8 through the limit nuts 9 to ensure the stability of the operating state of the volute fan.

[0024] Embodiment 2, on the basis of embodiment 1, the bottom of the docking lower seat 7 is inserted into the top of the movable top frame seat 3, the outer periphery of the movable top frame seat 3 is provided with an outer connecting hole 302 in a surrounding shape, the bottom of the docking lower seat 7 is provided with an inner connecting hole 703 in a surrounding shape, the inner connecting hole 703 is connected with the outer connecting hole 302, the positioning movable pin 11 is inserted into the connected inner connecting hole 703 and the outer connecting hole 302, the bottom of the positioning movable pin 11 is inclined, the rotating member 10 is rotatably connected to the docking lower seat 7, one end of the transmission connecting rod 12 is rotatably connected to the positioning movable pin 11, and the other end of the transmission connecting rod 12 is rotatably connected to the rotating member 10, a movable hole 1001 is provided on the outside of the rotating member 10, and a fixed hole 704 is provided in the bottom of the docking lower seat 7, one end of the reset tension spring 13 is connected to the movable hole 1001, and the other end of the reset tension spring 13 is connected to the fixed hole 704; By adopting the above technical scheme, when the bottom of the docking lower seat 7 is inserted into the top of the movable top frame seat 3, the inner connecting hole 703 and the outer connecting hole 302 are connected, and the rotating member 10 rotates and resets under the influence of the tension of the reset tension spring 13. The rotating member 10 drives the positioning movable pin 11 to move outward through the transmission connecting rod 12, so that the end of the positioning movable pin 11 is inserted into the outer connecting hole 302, thereby ensuring the firmness of the connection between the docking lower seat 7 and the movable top frame seat 3, and making the bracket assembly easier; when it is necessary to separate the docking lower seat 7 from the movable top frame seat 3, it is only necessary to press the positioning movable pin 11 inwardly with a screwdriver to separate the end of the positioning movable pin 11 from the outer connecting hole 302, and the positioning movable pin 11 drives the rotating member 10 to rotate in the opposite direction through the transmission connecting rod 12. The reset tension spring 13 is in a stretched state, and the docking lower seat 7 can be pulled upward to separate the docking lower seat 7 from the movable top frame seat 3, making the bracket disassembly and assembly easier.

[0025] The working principle of this embodiment is as follows: first, after the bottom of the docking lower seat 7 is inserted into the top of the movable top frame seat 3, the inner connecting hole 703 and the outer connecting hole 302 are in a connected state, and the rotating member 10 rotates and resets under the influence of the tension of the reset tension spring 13, and the rotating member 10 drives the positioning movable pin 11 to move outward through the transmission connecting rod 12, so that the end of the positioning movable pin 11 is inserted into the outer connecting hole 302, thereby ensuring the firmness of the connection between the docking lower seat 7 and the movable top frame seat 3; next, according to the different installation heights required for the volute type fan, the bidirectional screw 6 is rotated, and the bidirectional screw 6 drives the two lower connecting rods 4 to move, thereby changing the spacing distance between the two lower connecting rods 4, and the lower connecting rod 4 drives the movable top frame seat 3 to move through the X-shaped movable frame 2, thereby changing the spacing height between the movable top frame seat 3 and the fixed bottom frame seat 1, thereby changing the support upper seat 8 The height is better suitable for the installation and use requirements of volute fans at different heights; finally, according to the different installation positions required for the volute fans, the support upper seat 8 is fine-tuned by moving forward, backward, left and right to better meet the installation requirements of volute fans at different positions, and the limit nuts 9 are tightened in turn, and the support upper seat 8 is fixed by the limit nuts 9 to ensure the stability of the running state of the volute fan; when it is necessary to separate the docking lower seat 7 from the movable top frame seat 3, it is only necessary to press the positioning active pin 11 inwardly with a screwdriver to separate the end of the positioning active pin 11 from the external connecting hole 302, and the positioning active pin 11 drives the rotating part 10 to rotate in the opposite direction through the transmission connecting rod 12, and the reset tension spring 13 is in a stretched state, so that the docking lower seat 7 can be pulled upward to separate the docking lower seat 7 from the movable top frame seat 3.

[0026] In this article, there are a few points to note: 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0027] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0028] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An adjustable bracket for a volute fan, comprising: A fixed bottom frame seat (1); characterized in that two X-shaped movable frames (2) are installed on the top of the fixed bottom frame seat (1) in a bilaterally symmetrical manner, two lower connecting rods (4) are installed inside the fixed bottom frame seat (1), and the lower connecting rods (4) are connected to the X-shaped movable frames (2); a movable top frame seat (3) is connected to the top of the X-shaped movable frames (2), and the movable top frame seat (3) is connected to the two X-shaped movable frames (2); two upper connecting rods (5) are installed inside the movable top frame seat (3), and the upper connecting rods (5) are connected to the X-shaped movable frames (2); a bidirectional screw (6) is connected inside the fixed bottom frame seat (1), and the bidirectional screw The rod (6) is connected to two lower connecting rods (4); a docking lower seat (7) is installed on the top of the movable top frame seat (3); a supporting upper seat (8) is installed on the top of the docking lower seat (7); and the volute fan is fixedly installed on the top of the supporting upper seat (8); the bottom of the docking lower seat (7) is groove-shaped, and two rotating parts (10) are installed in a left-right symmetrical shape inside the bottom of the docking lower seat (7); three transmission connecting rods (12) are connected to the outside of the rotating part (10); the end of the transmission connecting rod (12) is connected to a positioning movable pin (11), and the positioning movable pin (11) is connected to the docking lower seat (7) and the movable top frame seat (3).

2. The adjustable bracket for a volute fan according to claim 1, characterized in that: The fixed bottom frame seat (1) is provided with lower sliding holes (101) on both front and rear sides, and the end of the lower connecting rod (4) is slidably connected in the lower sliding hole (101). The movable top frame seat (3) is provided with upper sliding holes (301) on both front and rear sides, and the end of the upper connecting rod (5) is slidably connected in the upper sliding hole (301).

3. The adjustable bracket for a volute fan according to claim 1, characterized in that: One end of the bottom of the X-shaped movable frame (2) is rotatably connected to the fixed bottom frame seat (1), the other end of the bottom of the X-shaped movable frame (2) is rotatably connected to the lower connecting rod (4), one end of the top of the X-shaped movable frame (2) is rotatably connected to the movable top frame seat (3), and the other end of the top of the X-shaped movable frame (2) is rotatably connected to the upper connecting rod (5).

4. The adjustable bracket for a volute fan according to claim 1, characterized in that: The lower connecting rod (4) is provided with a screw hole (401) inside, the bidirectional screw rod (6) is rotatably connected to the fixed bottom frame seat (1), and the bidirectional screw rod (6) is threadedly connected to the screw holes (401) provided in the two lower connecting rods (4).

5. The adjustable bracket for a volute fan according to claim 1, characterized in that: The top of the docking lower seat (7) is groove-shaped, the bottom of the supporting upper seat (8) is located inside the top of the docking lower seat (7), two side sliding holes A (701) are arranged on the front and rear sides of the docking lower seat (7), and two screw rods A (801) are arranged on the front and rear sides of the bottom of the supporting upper seat (8), and the screw rods A (801) are movably connected in the side sliding holes A (701).

6. The adjustable bracket for a volute fan according to claim 5, characterized in that: The docking lower seat (7) is provided with side sliding holes B (702) on the left and right sides, and the supporting upper seat (8) is provided with screw rods B (802) on the left and right sides of the bottom, the screw rods B (802) are movably connected in the side sliding holes B (702), the screw rods A (801) are externally threadedly connected to the limiting nut (9), and the screw rods B (802) are externally threadedly connected to the limiting nut (9), and the limiting nut (9) is in contact with the outer side of the docking lower seat (7).

7. The adjustable bracket for a volute fan according to claim 1, characterized in that: The bottom of the docking lower seat (7) is inserted into the top of the movable top frame seat (3); the outer periphery of the movable top frame seat (3) is provided with an outer connection hole (302) in a circumferential shape; the bottom of the docking lower seat (7) is provided with an inner connection hole (703) in a circumferential shape; the inner connection hole (703) is connected to the outer connection hole (302); the positioning movable pin (11) is inserted into the connected inner connection hole (703) and the outer connection hole (302); the bottom of the positioning movable pin (11) is inclined.

8. The adjustable bracket for a volute fan according to claim 1, characterized in that: The rotating member (10) is rotatably connected to the docking lower seat (7), one end of the transmission connecting rod (12) is rotatably connected to the positioning movable pin (11), the other end of the transmission connecting rod (12) is rotatably connected to the rotating member (10), a movable hole (1001) is provided on the outside of the rotating member (10), a fixed hole (704) is provided on the bottom of the docking lower seat (7), one end of the reset tension spring (13) is connected to the movable hole (1001), and the other end of the reset tension spring (13) is connected to the fixed hole (704).

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