A bending mechanism for producing pipeline repair hose

Abstract

The present invention discloses a bending mechanism for producing pipeline repair hoses, which relates to the technical field of hose production, and includes a frame, on which two symmetrically distributed folding plates are rotatably arranged, and also includes a clamping member, which is rotatably arranged on the folding plate, and a plurality of clamping members are equidistantly arranged; a driving component, which is used to drive the two folding plates to rotate toward the middle of the frame at the same time; a locking component, which is arranged in the folding plate and is used to lock the clamping member; an unlocking component, which is arranged in the folding plate, and in the process of the folding plate rotating and folding, the unlocking component unlocks the locking component, so that the clamping member passively clamps the hose repair material. The present invention passively clamps the hose repair material in the process of folding the folding plate through the cooperation of the driving component, the clamping member, the locking component and the unlocking component, and can realize the passive opening of the clamping member after folding, so as to facilitate the bending and stacking of the hose repair material.

Description

Technical Field

[0001] The invention relates to the technical field of hose production, and in particular to a bending mechanism for producing a pipeline repair hose. Background Art

[0002] Pipeline repair generally uses hose flipping lining technology: After the fiber hose with anti-seepage membrane is fully impregnated with resin, it is flipped by air pressure or water pressure to fit tightly against the inner wall of the old pipeline, and after thermosetting, a smooth inner lining glass fiber reinforced plastic pipe is formed, thus completing the repair of the old pipeline. When producing the repair hose, a whole piece of completed hose repair material needs to be bent, stacked, and welded to form a hose in the shape of the pipeline to be repaired.

[0003] The disadvantages of the prior art are that the bending of hose repair materials in the prior art is usually done manually. Since the overall length of the repair material is relatively long, multiple people are required to operate the bending and stacking at the same time. This method is not only inconvenient to operate, but also has low work efficiency and cannot guarantee bending accuracy. Therefore, those skilled in the art provide a bending mechanism for pipe repair hose production to solve the problems raised in the above background technology. Summary of the invention

[0004] The object of the present invention is to provide a bending mechanism for producing a pipeline repair hose to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a bending mechanism for producing a pipeline repair hose, comprising a frame, on which two symmetrically distributed folding plates are rotatably arranged, and further comprising:

[0006] A clamping member is rotatably arranged on the folding plate, and a plurality of the clamping members are arranged at equal intervals;

[0007] A driving assembly, used for driving the two folding plates to rotate toward the middle of the frame at the same time;

[0008] A locking assembly, which is disposed in the folding plate and is used to lock the clamping member;

[0009] The unlocking component is arranged in the folding plate. When the folding plate is rotated and folded, the unlocking component unlocks the locking component, so that the clamping member passively clamps the hose repair material.

[0010] As a further description of the above technical solution: a mounting block is fixedly arranged on the frame, a fixed shaft is fixedly arranged on the mounting block, a rotating sleeve is rotatably arranged on the outer side of the fixed shaft, and the folding plate is fixed on the rotating sleeve.

[0011] As a further description of the above technical solution: the driving assembly includes a motor fixed on the frame and a rotating shaft rotatably arranged on one side of the mounting block, the output shaft of the motor is connected to the rotating shaft, and a connecting rod is arranged between the rotating shaft and the folding plate so that when the rotating shaft rotates, the folding plate is driven to rotate; there are two rotating shafts in total, each of which is provided with a pulley, and the two pulleys are connected by a cross belt so that the two folding plates can rotate toward the middle of the frame at the same time.

[0012] As a further description of the above technical solution: the clamping member includes a clamping plate rotatably arranged on a folding plate through a movable shaft, a telescopic plate is slidably arranged on the clamping plate, and a first elastic member is arranged between the telescopic plate and the clamping plate.

[0013] As a further description of the above technical solution: one end of the first elastic member is connected to the clamping plate, and the other end is connected to the telescopic plate, and the first elastic member is a compression spring, and its elastic force is used to drive the telescopic plate to slide and reset.

[0014] As a further description of the above technical solution: the locking assembly includes a sliding seat slidably arranged in the folding plate, a second elastic member is arranged between the sliding seat and the folding plate, a locking block is slidably arranged in the sliding seat, and a third elastic member is arranged between the locking block and the sliding seat, and a locking groove adapted to the sliding seat is opened on the folding plate.

[0015] As a further description of the above technical solution: one end of the second elastic member is connected to the sliding seat, and the other end is connected to the folding plate, and the second elastic member is a compression spring, and its elastic force is used to drive the sliding seat to slide out of the folding plate when the locking block slides out of the locking groove.

[0016] As a further description of the above technical solution: the unlocking component includes a sliding rod slidably arranged in the folding plate and a cam fixedly sleeved on the fixed shaft, one end of the sliding rod abuts on the cam, and the other end is provided with a column; a through groove is provided on the sliding seat, and an extrusion groove is provided on the locking block, and an inclined surface is provided in the extrusion groove, and the column passes through the through groove and abuts on the inclined surface, so that when the sliding rod rotates, under the action of the cam, the locking block is driven to slide out of the locking groove.

[0017] As a further description of the above technical solution: a rack is arranged on the sliding seat, and a gear meshingly connected with the rack is sleeved on the movable shaft, so that when the sliding seat slides, the clamping plate is driven to rotate.

[0018] As a further description of the above technical solution: one end of the third elastic member is fixed on the locking block, and the other end is fixed on the sliding seat, and the third elastic member is a compression spring, and its elastic force is used to drive the locking block to slide and reset.

[0019] In the above technical solution, the bending mechanism for producing a pipeline repair hose provided by the present invention has the following beneficial effects:

[0020] The present invention provides a driving component, a clamping component, a locking component and an unlocking component, and can drive the unlocking component to passively unlock the locking component when the driving component drives the folding plate to rotate and fold, so that the clamping component passively clamps the hose repair material, that is, during the folding process of the folding plate, the hose repair material is passively clamped, and the clamping component can be passively opened after folding, so as to facilitate the bending and stacking of the hose repair material, and effectively improve the work efficiency, that is, the folding accuracy.

[0021] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0022] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A schematic structural diagram of a bending mechanism for producing a pipeline repair hose provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of a driving assembly in a bending mechanism for producing a pipeline repair hose provided by an embodiment of the present invention;

[0026] Figure 3 A schematic cross-sectional structure diagram of a bending mechanism for producing a pipeline repair hose provided by an embodiment of the present invention;

[0027] Figure 4 A schematic cross-sectional structure diagram of a folding plate in a bending mechanism for producing a pipeline repair hose provided by an embodiment of the present invention;

[0028] Figure 5 A partial enlarged view of A in a bending mechanism for producing a pipeline repair hose provided in an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the structure of a clamping member and a locking assembly in a bending mechanism for producing a pipeline repair hose provided by an embodiment of the present invention;

[0030] Figure 7 A schematic diagram of the structure of a sliding seat in a bending mechanism for producing a pipeline repair hose provided by an embodiment of the present invention;

[0031] Figure 8 A schematic structural diagram of a locking block in a bending mechanism for producing a pipeline repair hose provided in an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 1. Frame; 2. Fixed shaft; 3. Folding plate; 4. Rotating sleeve; 5. Driving assembly; 51. Rotating shaft; 52. Pulley; 53. Cross belt; 54. Motor; 55. Connecting rod; 6. Clamping member; 61. Movable shaft; 62. Clamping plate; 63. Telescopic plate; 64. First elastic member; 7. Cam; 8. Sliding rod; 9. Sliding seat; 10. Second elastic member; 11. Column; 12. Locking block; 13. Third elastic member; 14. Locking groove; 15. Extrusion groove; 16. Inclined surface; 17. Through groove; 18. Rack; 19. Gear; 20. Exhaust gap; 21. Mounting block. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0035] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. "Include" or "comprise" and other similar words used in the present disclosure mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] See also Figures 1 to 8The embodiment of the present invention provides a technical solution: a bending mechanism for producing a pipeline repair hose, comprising a frame 1, on which two symmetrically distributed folding plates 3 are rotatably arranged, and the hose repair material is bent and stacked by rotating the folding plates 3 to form a hose, and further comprising,

[0037] A clamping member 6, the clamping member 6 is rotatably disposed on the folding plate 3, and a plurality of the clamping members 6 are equidistantly disposed, and the clamping member 6 is used to clamp the hose repair material laid on the frame 1 and the folding plate 3;

[0038] A driving assembly 5, the driving assembly 5 is used to drive the two folding plates 3 to rotate toward the middle of the frame 1 at the same time, that is, to drive the folding plates 3 to bend and stack the repair material;

[0039] A locking assembly, which is arranged in the folding plate 3 and is used to lock the clamping member 6 so that the clamping member 6 remains in a clamping state;

[0040] The unlocking component is arranged in the folding plate 3. During the process of the folding plate 3 rotating and folding, the unlocking component unlocks the locking component, so that the clamping member 6 passively clamps the hose repair material. That is, during the process of the driving component 5 driving the folding plate 3 to rotate and fold, the unlocking component passively unlocks the locking component, so that the clamping member 6 passively clamps the hose repair material and can realize the passive opening of the clamping member 6 after folding.

[0041] The present invention provides a driving component 5, a clamping member 6, a locking component and an unlocking component, and can drive the unlocking component to passively unlock the locking component during the process of the driving component 5 driving the folding plate 3 to rotate and fold, so that the clamping member 6 passively clamps the hose repair material, that is, during the folding process of the folding plate 3, the hose repair material is passively clamped, and the clamping member 6 can be passively opened after folding, so as to facilitate the bending and stacking of the hose repair material, and effectively improve the work efficiency, that is, the folding accuracy.

[0042] In another embodiment provided by the present invention, an exhaust gap 20 is formed between the folding plate 3 and the frame 1, and the exhaust gap 20 is exhausted by an exhaust fan to position the folding part of the hose repair material, so that the hose repair material is folded from the exhaust gap 20, thereby improving the folding accuracy.

[0043] In another embodiment provided by the present invention, a mounting block 21 is fixedly provided on the frame 1, a fixed shaft 2 is fixedly provided on the mounting block 21, the fixed shaft 2 is fixed between two mounting blocks 21, a rotating sleeve 4 is rotatably provided on the outer side of the fixed shaft 2, and the folding plate 3 is fixed on the rotating sleeve 4, so that when the driving assembly 5 drives the rotating sleeve 4 to drive the folding plate 3 to rotate, the fixed shaft 2 is fixed.

[0044] In another embodiment provided by the present invention, the driving assembly 5 includes a motor 54 fixed to the frame 1 and a rotating shaft 51 rotatably arranged on one side of the mounting block 21, the output shaft of the motor 54 is connected to the rotating shaft 51, and a connecting rod 55 is arranged between the rotating shaft 51 and the folding plate 3, so that when the rotating shaft 51 rotates, the folding plate 3 is driven to rotate; there are two rotating shafts 51, that is, one is arranged on the mounting block 21 corresponding to each folding plate 3 (refer to Figure 2 ), each rotating shaft 51 is provided with a pulley 52, and the two pulleys 52 are connected by a cross belt 53, so that the two folding plates 3 can rotate toward the middle of the frame 1 at the same time. The driving assembly 5 set in this design can simultaneously drive the two folding plates 3 to rotate toward the middle of the frame 1 for folding.

[0045] In another embodiment provided by the present invention, the clamping member 6 includes a clamping plate 62 rotatably set on the folding plate 3 through a movable shaft 61, and a telescopic plate 63 is slidably set on the clamping plate 62. The telescopic plate 63 slides vertically along the clamping plate 62, and a first elastic member 64 is set between the telescopic plate 63 and the clamping plate 62. The telescopic plate 63 is slidably set, so that during the folding process of the folding plate 3, the telescopic plate 63 is squeezed by the frame 1 and can slide and shrink into the clamping plate 62 without affecting the rotation of the folding plate 3.

[0046] In another embodiment provided by the present invention, one end of the first elastic member 64 is connected to the clamping plate 62, and the other end is connected to the telescopic plate 63, and the first elastic member 64 is a compression spring, and its elastic force is used to drive the telescopic plate 63 to slide and reset.

[0047] In another embodiment provided by the present invention, the locking assembly includes a sliding seat 9 slidably arranged in the folding plate 3, and the sliding seat 9 is provided with a rounded corner, so that when the folding plate 3 is rotated and folded, the rounded corners on the two telescopic sliding seats 9 can squeeze each other, driving the sliding seat 9 to passively slide and shrink into the folding plate 3, realizing the movement of the sliding seat 9, driving the clamping member 6 to open, and the sliding seat 9 slides horizontally along the folding plate 3. A second elastic member 10 is provided between the sliding seat 9 and the folding plate 3. A locking block 12 is slidably arranged in the sliding seat 9, and the locking block 12 slides vertically along the sliding seat 9, and a third elastic member 13 is provided between the locking block 12 and the sliding seat 9. A locking groove 14 adapted to the sliding seat 9 is provided on the folding plate 3. The locking assembly is used to lock the sliding seat 9, and the clamping member 6 remains in an open state. When the sliding seat 9 is unlocked, the clamping member 6 is automatically clamped.

[0048] In another embodiment provided by the present invention, one end of the second elastic member 10 is connected to the sliding seat 9, and the other end is connected to the folding plate 3, and the second elastic member 10 is a compression spring, and its elastic force is used to drive the sliding seat 9 to slide out of the folding plate 3 when the locking block 12 slides out of the locking groove 14.

[0049] In another embodiment provided by the present invention, the unlocking component includes a sliding rod 8 slidably arranged in the folding plate 3 and a cam 7 fixedly sleeved on the fixed shaft 2, one end of the sliding rod 8 abuts on the cam 7, and the other end is provided with a column 11, the column 11 is rotatably connected to the sliding rod 8, which can reduce friction; a through groove 17 is provided on the sliding seat 9, and an extrusion groove 15 is provided on the locking block 12, and an inclined surface 16 is provided in the extrusion groove 15, and the column 11 passes through the through groove 17 and abuts on the inclined surface 16, so that when the sliding rod 8 rotates, under the action of the cam 7, the locking block 12 is driven to slide out of the locking groove 14 to unlock the sliding seat 9. In this design, through the cooperation of the cam 7, the sliding rod 8 and the sliding seat 9, the unlocking component passively unlocks the sliding seat 9 during the rotation of the folding plate 3.

[0050] In another embodiment provided by the present invention, a rack 18 is provided on the sliding seat 9, and a gear 19 meshingly connected to the rack 18 is sleeved on the movable shaft 61, so that when the sliding seat 9 slides, the clamping plate 62 is driven to rotate, that is, when the sliding seat 9 is unlocked, the clamping plate 62 rotates and clamps, and when the sliding seat 9 is locked, the clamping plate 62 rotates and opens.

[0051] In another embodiment provided by the present invention, one end of the third elastic member 13 is fixed on the locking block 12, and the other end is fixed on the sliding seat 9, and the third elastic member 13 is a compression spring, and its elastic force is used to drive the locking block 12 to slide and reset.

[0052] In actual use, the hose repair material is laid on the frame 1 and the folding plate 3, and then the driving motor 54 is driven to drive the rotating shaft 51 connected thereto to rotate. When the rotating shaft 51 rotates, the connecting rod 55 drives the folding plate 3 to rotate, and at the same time, the pulley 52 rotates synchronously. At this time, the cross belt 53 drives the pulley 52 on the other rotating shaft 51 to rotate (refer to Figure 2 ), so that the connecting rod 55 drives the other folding plate 3 to rotate, so that the two folding plates 3 rotate toward the middle of the frame 1 at the same time, and the hose repair material is bent and stacked. When the folding plate 3 rotates and folds, the rotating sleeve 4 rotates synchronously with the folding plate 3, the fixed shaft 2 and the cam 7 thereon are fixed, and the sliding rod 8 rotates synchronously with the folding plate 3. During the rotation of the folding plate 3, the sliding rod 8 moves along the surface of the cam 7. During this process, the sliding rod 8 slides in the direction of the sliding seat 9, that is, slides to the left (refer to Figure 4 ), during the sliding process of the sliding rod 8, the sliding rod 8 and the upper column 11 thereof pass through the through slot 17 and enter the extrusion slot 15 to extrude the inclined surface 16 (refer to Figure 5 ), so that the locking block 12 moves vertically downward along the sliding seat 9 and disengages from the locking groove 14, that is, the locking assembly is unlocked. At this time, the elastic restoring force of the second elastic member 10 drives the sliding seat 9 to slide outward of the folding plate 3 (refer to Figure 6), during the sliding process of the sliding seat 9, the rack 18 on it is driven to move synchronously, thereby driving the gear 19 meshing with the rack 18 to rotate, so that the movable shaft 61 rotates, driving the clamping plate 62 and the telescopic plate 63 to rotate and clamp the hose repair material, the folding plate 3 continues to rotate, and the clamping member 6 maintains the clamping state, that is, the clamping member 6 is clamped passively during the rotation and folding process of the folding plate 3. After the hose repair material is folded, as the two folding plates 3 rotate closer, the fillets on the two sliding seats 9 are squeezed, and The telescopic plate 63 is pressurized by the frame 1 and slides into the clamping plate 62 without affecting the folding of the folding plate 3. The folding plate 3 continues to rotate, so that the two sliding seats 9 are squeezed against each other and slide and shrink into the folding plate 3. When the sliding seat 9 slides into the folding plate 3, the locking block 12 slides synchronously with the sliding seat 9. At the same time, the sliding rod 8 is squeezed and slides. When the locking block 12 slides to the position of the locking groove 14, the elastic restoring force of the third elastic member 13 drives the locking block 12 to slide vertically upward and insert into the locking groove 14. The fixing of the sliding seat 9 is realized. At the same time, in this process, during the sliding of the sliding seat 9, the rack 18 slides synchronously, so that the gear 19 drives the movable shaft 61 to rotate, so that the clamping plate 62 is passively rotated and opened, that is, the clamping plate 62 and the telescopic plate 63 are rotated and opened, and the hose repair material is loosened to realize the folding of the hose repair material, and then the welding gap is performed to form a hose, that is, after the folding is completed, the passive opening of the clamping member 6 is realized, and then, the motor 54 is rotated in the opposite direction to drive the two folding plates 3 to rotate and reset. During the rotation and reset of the folding plate 3, the telescopic plate 63 loses the extrusion force, and the elastic restoring force of the first elastic member 64 drives the telescopic plate 63 to slide and reset. At the same time, during the rotation and reset of the folding plate 3, when the sliding rod 8 passes through the cam 7, similarly, it is squeezed by the cam 7, which will cause the unlocking assembly to drive the clamping member 6 to rotate into a clamping state. After the folding plate 3 is rotated and reset, pressure is manually applied to the sliding seat 9, so that the sliding seat 9 slides into the folding plate 3, driving the clamping member 6 to automatically open, and it can be used next time.

[0053] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A bending mechanism for producing a pipeline repair hose, comprising a frame (1), characterized in that: The frame (1) is rotatably provided with two symmetrically distributed folding plates (3), and further comprises: A clamping member (6) is rotatably arranged on the folding plate (3), and a plurality of the clamping members (6) are arranged at equal intervals; A driving assembly (5) for driving the two folding plates (3) to rotate toward the middle of the frame (1) at the same time; A locking assembly, which is arranged in the folding plate (3) and is used to lock the clamping member (6); An unlocking component is arranged in the folding plate (3), and during the process of the folding plate (3) rotating and folding, the unlocking component unlocks the locking component, so that the clamping member (6) passively clamps the hose repair material; The frame (1) is fixedly provided with a mounting block (21), a fixed shaft (2) is fixedly provided on the mounting block (21), a rotating sleeve (4) is rotatably provided on the outer side of the fixed shaft (2), and the folding plate (3) is fixed on the rotating sleeve (4); The driving assembly (5) comprises a motor (54) fixed on the frame (1) and a rotating shaft (51) rotatably arranged on one side of the mounting block (21); an output shaft of the motor (54) is connected to the rotating shaft (51); a connecting rod (55) is arranged between the rotating shaft (51) and the folding plate (3), so that when the rotating shaft (51) rotates, the folding plate (3) is driven to rotate; There are two rotating shafts (51) in total, each of which is sleeved with a belt pulley (52), and the two belt pulleys (52) are connected by a cross belt (53) so that the two folding plates (3) rotate toward the middle of the frame (1) at the same time; The clamping member (6) comprises a clamping plate (62) rotatably arranged on the folding plate (3) via a movable shaft (61), a telescopic plate (63) being slidably arranged on the clamping plate (62), and a first elastic member (64) being arranged between the telescopic plate (63) and the clamping plate (62); One end of the first elastic member (64) is connected to the clamping plate (62), and the other end is connected to the telescopic plate (63), and the first elastic member (64) is a compression spring, the elastic force of which is used to drive the telescopic plate (63) to slide and reset.

2. A bending mechanism for producing a pipeline repair hose according to claim 1, characterized in that: The locking assembly comprises a sliding seat (9) slidably arranged in the folding plate (3), a second elastic member (10) is arranged between the sliding seat (9) and the folding plate (3), a locking block (12) is slidably arranged in the sliding seat (9), and a third elastic member (13) is arranged between the locking block (12) and the sliding seat (9), and a locking groove (14) adapted to the sliding seat (9) is provided on the folding plate (3).

3. A bending mechanism for producing a pipeline repair hose according to claim 2, characterized in that: One end of the second elastic member (10) is connected to the sliding seat (9), and the other end is connected to the folding plate (3), and the second elastic member (10) is a compression spring, the elastic force of which is used to drive the sliding seat (9) to slide out of the folding plate (3) when the locking block (12) slides out of the locking groove (14).

4. A bending mechanism for producing a pipeline repair hose according to claim 2, characterized in that: The unlocking assembly comprises a sliding rod (8) slidably arranged in the folding plate (3) and a cam (7) fixedly sleeved on the fixed shaft (2); one end of the sliding rod (8) abuts against the cam (7) and the other end is provided with a column (11); The sliding seat (9) is provided with a through slot (17), the locking block (12) is provided with an extrusion slot (15), an inclined surface (16) is provided in the extrusion slot (15), and the column (11) passes through the through slot (17) and abuts against the inclined surface (16), so that when the sliding rod (8) rotates, the locking block (12) is driven to slide out of the locking slot (14) under the action of the cam (7).

5. A bending mechanism for producing a pipeline repair hose according to claim 4, characterized in that: The sliding seat (9) is provided with a rack (18), and the movable shaft (61) is sleeved with a gear (19) meshingly connected with the rack (18), so that when the sliding seat (9) slides, the clamping plate (62) is driven to rotate.

6. A bending mechanism for producing a pipeline repair hose according to claim 2, characterized in that: One end of the third elastic member (13) is fixed on the locking block (12), and the other end is fixed on the sliding seat (9), and the third elastic member (13) is a compression spring, the elastic force of which is used to drive the locking block (12) to slide and reset.

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