Hydraulic drive type winch hoist

Abstract

The utility model relates to the field of hoists, in particular to a hydraulic drive type winch hoist. The technical problems that when an existing winding hoist drives a winding mechanism through hydraulic energy, the stability of the winding mechanism is usually difficult to improve, and the winding mechanism is difficult to rapidly position and fix after winding is completed are solved. According to the technical scheme, the hydraulic drive type winch hoist comprises a supporting assembly; the device further comprises a hydraulic assembly, a winding assembly, a positioning assembly, a fixing assembly, a limiting assembly and a cam transmission assembly. By means of cam transmission, linear motion of the hydraulic assembly is converted into rotary motion through the cam transmission assembly to drive the winding assembly to rotate, a rope on the winding assembly is wound, the cam transmission assembly is limited through the limiting assembly, the stability of the cam transmission assembly in the moving process can be improved, and the winding efficiency is improved. The winding hoist solves the problem that when an existing winding hoist drives a winding mechanism through hydraulic energy, the stability of the winding mechanism is usually difficult to improve.

Description

Technical Field

[0001] The utility model belongs to the field of gate hoists, and in particular relates to a hydraulically driven winch gate hoist. Background Art

[0002] A hydraulically driven winch hoist is a mechanical device that uses a hydraulic system to achieve lifting and opening and closing operations. This type of machine is usually widely used in industries, construction, ports, etc., for lifting, loading and unloading goods or realizing the opening and closing functions of large equipment. The current winch hoist usually uses a gear box and a motor to rotate the winding mechanism to achieve the hoisting of the goods. However, when the current winch hoist uses hydraulic energy to drive the winding mechanism, it is usually difficult to improve the stability of the winding mechanism, and it is difficult to achieve rapid positioning and fixation of the winding mechanism after the hoisting is completed. Utility Model Content

[0003] In order to overcome the problem that when the current winch hoist uses hydraulic energy to drive the winding mechanism, it is usually difficult to improve the stability of the winding mechanism and it is difficult to quickly position and fix the winding mechanism after the winch is completed.

[0004] The technical solution of the utility model is: a hydraulically driven winch opening and closing machine, including a support component; also including a hydraulic component, a winding component, a positioning component, a fixing component, a limit component and a cam transmission component; a hydraulic component for braking is arranged at the upper end of the support component; a winding component for winding is arranged at the upper end of the support component; a positioning component for positioning the winding component is arranged on the support component; a fixing component is arranged on the support component; a limit component for positioning the cam transmission component is arranged on the fixing component; and a cam transmission component for driving the winding component is arranged on the winding component.

[0005] Preferably, when in use, the hydraulic assembly is turned on to drive the cam transmission assembly to rotate, and through the cam transmission, the linear motion of the hydraulic assembly is converted into rotational motion through the cam transmission assembly to drive the winding assembly to rotate, thereby winding the wire rope on the winding assembly. After the winding is completed, the positioning assembly is turned on to position the winding assembly. When in use, the fixing assembly is installed on the supporting assembly so that the limiting assembly limits the cam transmission assembly, which can improve the stability of the cam transmission assembly during movement, and solves the problem that when the current winch opening and closing machine uses hydraulic energy to drive the winding mechanism, it is usually difficult to improve the stability of the winding mechanism, and it is difficult to quickly position and fix the winding mechanism after the winch is completed.

[0006] Preferably, the supporting assembly includes a base plate, a supporting plate, a first trough body, a first support block, a fixed frame and a second support block; the upper end of the base plate is fixedly connected to the supporting plate; a first trough body is provided through the upper and lower ends of the base plate; a symmetrical first support block is fixedly connected to the upper end of the supporting plate; a fixed frame is fixedly connected to the upper end of the first support block; a symmetrical second support block is fixedly connected to the lower end of the fixed frame, and the first trough body is conveniently arranged below the upper wire body of the winding assembly.

[0007] Preferably, the hydraulic assembly includes a third support block, a first fixed plate, a bracket, a first hydraulic cylinder, a second hydraulic cylinder and a push block; two third support blocks are fixedly connected to the upper end of the base plate; the upper end of the third support block is fixedly connected to the first fixed plate; the lower end of the first fixed plate is fixedly connected to the bracket; the first hydraulic cylinder is fixedly connected to the bracket; the right end of the first fixed plate is fixedly connected to the second hydraulic cylinder; the front end of the telescopic rod of the second hydraulic cylinder is fixedly connected to the push block, turning on the first hydraulic cylinder can position the fixed assembly, and turning on the second hydraulic cylinder can make the push block drive the cam transmission assembly to move.

[0008] Preferably, the winding assembly includes a frame, a bearing, a wire-taking roller and a positioning groove; the upper end of the supporting plate is fixedly connected to the frame; the upper end of the frame is fixedly connected to the lower end of the second support block; symmetrical bearings are fixedly connected through the left and right ends of the frame; a wire-taking roller is rotatably installed between the two frames; the outer wall of the wire-taking roller is provided with uniform and symmetrical positioning grooves, and when the wire-taking roller rotates, it can drive the wire rope tied to the outer wall of the wire-taking roller to be released or the wire rope can be wound up.

[0009] Preferably, the positioning assembly includes an electric cylinder and a positioning block; the electric cylinder is fixedly connected to the inner wall of the front end of the fixed frame; the positioning block is fixedly connected to the lower end of the telescopic rod of the electric cylinder; the positioning block is in an inverted "U" shape; the outer wall of the lower end of the positioning block is adapted to the inner wall of the positioning groove, and when the take-up roller needs to be positioned, the electric cylinder is turned on to make the positioning block move downward into the inner wall of the positioning groove, thereby achieving stable positioning of the take-up roller.

[0010] Preferably, the fixing assembly includes a mounting tube, a positioning column, a first through hole, a first movable block, a fixed block and a positioning hole; the outer wall of the telescopic rod of the first hydraulic cylinder is threadedly mounted with the mounting tube; the front end of the mounting tube is fixedly connected to the positioning column; the rear end of the fixing frame is penetrated by a first through hole; the inner wall of the first through hole fits with the outer wall of the positioning column; two first movable blocks are movably arranged at the lower end of the fixing frame; the upper end of the first movable block is fixedly connected with the fixing block; the rear end of the fixing block is provided with a positioning hole; the inner wall of the positioning hole fits with the outer wall of the front end of the positioning column, the mounting tube is threadedly mounted on the outer wall of the telescopic rod of the first hydraulic cylinder, the first hydraulic cylinder is opened to place the positioning column into the inner wall of the positioning hole, and the stable placement of the fixed block can be achieved.

[0011] Preferably, the limiting assembly includes a second through hole, a mounting column, a first limiting block and an internal threaded barrel; symmetrical second through holes are provided at both ends of the fixed block; two mounting columns are movably provided at both ends of the fixed frame; the outer wall of the mounting column is fitted with the inner wall of the second through hole; the outer wall of the mounting column is sleeved with a first limiting block; a plurality of internal threaded barrels are threadedly installed on the outer wall of the mounting column, the mounting column is fixed to the fixed frame by the internal threaded barrel, and the first limiting block is fixed to the outer wall of the mounting column by the internal threaded barrel, and limiting the cam transmission assembly by the first limiting block can improve the stability of the cam transmission assembly during use.

[0012] Preferably, the cam transmission assembly includes a connecting column, an eccentric wheel, an eccentric shaft, a limiting ring, a connecting rod, a second fixed plate, a second limiting block, a third limiting block and a second movable block; the right end of the winding roller is fixedly connected to the connecting column; the right end of the connecting column is fixedly connected to the eccentric wheel; the right end of the eccentric wheel is fixedly connected to the eccentric shaft; the outer wall of the eccentric shaft is fixedly connected to the limiting ring; the outer wall of the eccentric shaft is sleeved with a connecting rod; the front end of the first fixed plate is fixedly connected to a symmetrical second fixed plate; the second limiting block and the third limiting block are fixedly connected at one end of the two second fixed plates close to each other; a second movable block is movably arranged between the second limiting block and the third limiting block; the other end of the connecting rod is hinged to the front end outer wall of the second movable block; the left and right ends of the connecting rod are in contact with the left and right inner walls of the first limiting block; the right end of the pushing block is fixedly connected to the left end of the second movable block, and the second movable block is driven to move forward and backward by the pushing block, so that the linear motion is converted into rotational motion through the action of the connecting rod and the eccentric shaft, thereby realizing the rotation of the winding assembly.

[0013] Beneficial effects of the utility model:

[0014] 1. The cam transmission component is driven to rotate by turning on the hydraulic component. Through cam transmission, the linear motion of the hydraulic component is converted into rotational motion through the cam transmission component to drive the winding component to rotate, so as to achieve winding of the wire rope on the winding component. By installing the fixing component on the supporting component, the limit component limits the cam transmission component, which can improve the stability of the cam transmission component during movement, and solve the problem that it is usually difficult to improve the stability of the winding mechanism when the current winch hoist uses hydraulic energy to drive the winding mechanism;

[0015] 2. When the take-up roller needs to be positioned, the electric cylinder is turned on to move the positioning block downward into the inner wall of the positioning groove, so that the take-up roller can be stably positioned. This solves the problem that when the current winch hoist uses hydraulic energy to drive the winding mechanism, it is difficult to quickly position and fix the winding mechanism after the winch is completed;

[0016] 3. Thread the installation tube onto the outer wall of the telescopic rod of the first hydraulic cylinder, open the first hydraulic cylinder and place the positioning column into the inner wall of the positioning hole, so as to achieve stable placement of the fixed block, use the internal threaded tube to fix the installation column on the fixed frame, and use the internal threaded tube to fix the first limit block on the outer wall of the installation column, and use the first limit block to limit the cam transmission assembly to improve the stability of the cam transmission assembly during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 What is shown is a three-dimensional structural schematic diagram of a hydraulically driven winch hoist of the utility model;

[0018] Figure 2 What is shown is a three-dimensional structural schematic diagram of a support assembly of a hydraulically driven winch hoist of the utility model;

[0019] Figure 3 The three-dimensional structure diagram of the hydraulic assembly, winding assembly and positioning assembly of a hydraulically driven winch hoist of the utility model is shown;

[0020] Figure 4 The three-dimensional structure diagram of the second hydraulic cylinder and the push block of a hydraulically driven winch hoist of the utility model is shown;

[0021] Figure 5 What is shown is a three-dimensional structural schematic diagram of a fixing assembly of a hydraulically driven winch hoist of the utility model;

[0022] Figure 6 What is shown is a three-dimensional structural schematic diagram of a limit assembly of a hydraulically driven winch hoist of the utility model;

[0023] Figure 7 What is shown is a three-dimensional structural schematic diagram of a cam transmission component of a hydraulically driven winch hoist of the utility model.

[0024] The markings in the accompanying drawings are: 1-support assembly, 101-bottom plate, 102-carrying plate, 103-first trough, 104-first support block, 105-fixed frame, 106-second support block, 2-hydraulic assembly, 201-third support block, 202-first fixed plate, 203-bracket, 204-first hydraulic cylinder, 205-second hydraulic cylinder, 206-push block, 3-winding assembly, 301-frame, 302-bearing, 303-winding roller, 304-positioning groove, 4-positioning assembly, 401-electric cylinder, 402-positioning block, 5-fixing assembly, 501-installing cylinder, 502-positioning column, 503-first through hole, 504-first movable block, 505-fixed block, 506-positioning hole, 6-limiting assembly, 601-second through hole, 602-installing column, 603-first limiting block, 604-inner thread cylinder, 7-cam transmission assembly, 701-connecting column, 702-eccentric wheel, 703-eccentric shaft, 704-limiting ring, 705-connecting rod, 706-second fixed plate, 707-second limiting block, 708-third limiting block, 709-second movable block. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] See also Figure 1 The utility model provides an embodiment: a hydraulically driven winch hoist, comprising a support assembly 1; further comprising a hydraulic assembly 2, a winding assembly 3, a positioning assembly 4, a fixing assembly 5, a limiting assembly 6 and a cam transmission assembly 7; a hydraulic assembly 2 for braking is provided at the upper end of the support assembly 1; a winding assembly 3 for winding is provided at the upper end of the support assembly 1; a positioning assembly 4 for positioning the winding assembly 3 is provided on the support assembly 1; a fixing assembly 5 is provided on the support assembly 1; a limiting assembly 6 for positioning the cam transmission assembly 7 is provided on the fixing assembly 5; a cam transmission assembly 7 for driving the winding assembly 3 is provided on the winding assembly 3.

[0027] See also Figure 2 In this embodiment, the support assembly 1 includes a base plate 101, a carrying plate 102, a first slot body 103, a first support block 104, a fixing frame 105 and a second support block 106; the upper end of the base plate 101 is fixedly connected to the carrying plate 102; the first slot body 103 is penetrated through the upper and lower ends of the base plate 101; the upper end of the carrying plate 102 is fixedly connected to a symmetrical first support block 104; the upper end of the first support block 104 is fixedly connected to the fixing frame 105; the lower end of the fixing frame 105 is fixedly connected to a symmetrical second support block 106.

[0028] See also Figure 3 and 4In this embodiment, the hydraulic assembly 2 includes a third support block 201, a first fixed plate 202, a bracket 203, a first hydraulic cylinder 204, a second hydraulic cylinder 205 and a push block 206; the upper end of the bottom plate 101 is fixedly connected to two third support blocks 201; the upper end of the third support block 201 is fixedly connected to the first fixed plate 202; the lower end of the first fixed plate 202 is fixedly connected to the bracket 203; the first hydraulic cylinder 204 is fixedly connected to the bracket 203; the right end of the first fixed plate 202 is fixedly connected to the second hydraulic cylinder 205; the front end of the telescopic rod of the second hydraulic cylinder 205 is fixedly connected to the push block 206; the winding assembly 3 includes a frame 301, a bearing 302, a take-up roller 303 and a positioning Groove 304; the upper end of the carrying plate 102 is fixedly connected to the frame 301; the upper end of the frame 301 is fixedly connected to the lower end of the second support block 106; symmetrical bearings 302 are fixedly connected to the left and right ends of the frame 301; a take-up roller 303 is rotatably installed between the two frames 301; the outer wall of the take-up roller 303 is provided with uniform and symmetrical positioning grooves 304; the positioning component 4 includes an electric cylinder 401 and a positioning block 402; the electric cylinder 401 is fixedly connected to the inner wall of the front end of the fixed frame 105; the positioning block 402 is fixedly connected to the lower end of the telescopic rod of the electric cylinder 401; the positioning block 402 is in an inverted "U" shape; the outer wall of the lower end of the positioning block 402 is adapted to the inner wall of the positioning groove 304.

[0029] See also Figure 5 In this embodiment, the fixing assembly 5 includes a mounting tube 501, a positioning column 502, a first through hole 503, a first movable block 504, a fixing block 505 and a positioning hole 506; the outer wall of the telescopic rod of the first hydraulic cylinder 204 is threadedly mounted with the mounting tube 501; the front end of the mounting tube 501 is fixedly connected with the positioning column 502; the rear end of the fixing frame 105 is penetrated by a first through hole 503; the inner wall of the first through hole 503 is fitted with the outer wall of the positioning column 502; two first movable blocks 504 are movably provided at the lower end of the fixing frame 105; the upper end of the first movable block 504 is fixedly connected with the fixing block 505; the rear end of the fixing block 505 is provided with a positioning hole 506; the inner wall of the positioning hole 506 is fitted with the outer wall of the front end of the positioning column 502.

[0030] See also Figure 6 In this embodiment, the limiting component 6 includes a second through hole 601, a mounting column 602, a first limiting block 603 and an internal threaded tube 604; symmetrical second through holes 601 are provided at both ends of the fixed block 505; two mounting columns 602 are movably provided at both ends of the fixed frame 105; the outer wall of the mounting column 602 is fitted with the inner wall of the second through hole 601; the outer wall of the mounting column 602 is sleeved with a first limiting block 603; and a plurality of internal threaded tubes 604 are threadedly installed on the outer wall of the mounting column 602.

[0031] See also Figure 7In this embodiment, the cam transmission assembly 7 includes a connecting column 701, an eccentric wheel 702, an eccentric shaft 703, a limiting ring 704, a connecting rod 705, a second fixed plate 706, a second limiting block 707, a third limiting block 708 and a second movable block 709; the right end of the take-up roller 303 is fixedly connected with the connecting column 701; the right end of the connecting column 701 is fixedly connected with the eccentric wheel 702; the right end of the eccentric wheel 702 is fixedly connected with the eccentric shaft 703; the outer wall of the eccentric shaft 703 is fixedly connected with the limiting ring 704; the outer wall of the eccentric shaft 703 is sleeved with a connecting rod 705; a symmetrical second fixed plate 706 is fixedly connected to the front end of the first fixed plate 202; a second limit block 707 and a third limit block 708 are fixedly connected to one end of the two second fixed plates 706 close to each other; a second movable block 709 is movably arranged between the second limit block 707 and the third limit block 708; the other end of the connecting rod 705 is hinged to the front end outer wall of the second movable block 709; the left and right ends of the connecting rod 705 are in contact with the left and right inner walls of the first limit block 603; the right end of the push block 206 is fixedly connected to the left end of the second movable block 709.

[0032] When working, first place the two first movable blocks 504 at the lower end of the fixed frame 105, then use the internal threaded tube 604 to fix the mounting column 602 on the fixed frame 105, and use the internal threaded tube 604 to fix the first limit block 603 on the outer wall of the mounting column 602, and use the first limit block 603 to limit the left and right ends of the connecting rod 705 of the cam transmission assembly 7;

[0033] Next, the installation tube 501 is threadedly installed on the outer wall of the telescopic rod of the first hydraulic cylinder 204, and the first hydraulic cylinder 204 is opened to place the positioning column 502 into the inner wall of the positioning hole 506;

[0034] Then, the second hydraulic cylinder 205 is turned on to make the push block 206 drive the second movable block 709 to move forward and backward, and the linear motion is converted into rotational motion through the action of the connecting rod 705 and the eccentric shaft 703, so as to realize the rotation of the winding assembly 3. When the winding roller 303 rotates, it can drive the wire rope tied to the outer wall of the winding roller 303 to release or wind up the wire rope;

[0035] When the take-up roller 303 needs to be positioned, the electric cylinder 401 is turned on so that the positioning block 402 moves downward into the inner wall of the positioning groove 304 , thereby achieving stable positioning of the take-up roller 303 .

[0036] Through the above steps, when in use, the hydraulic component 2 is turned on to drive the cam transmission component 7 to rotate. Through the cam transmission, the linear motion of the hydraulic component 2 is converted into rotational motion through the cam transmission component 7 to drive the winding component 3 to rotate, so as to realize winding of the wire rope on the winding component 3. After the winding is completed, the positioning component 4 is turned on to position the winding component 3. When in use, the fixing component 5 is installed on the supporting component 1, so that the limiting component 6 limits the cam transmission component 7, which can improve the stability of the cam transmission component 7 during movement, and solves the problem that when the current winch opening and closing machine uses hydraulic energy to drive the winding mechanism, it is usually difficult to improve the stability of the winding mechanism, and it is difficult to quickly position and fix the winding mechanism after the winch is completed.

[0037] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A hydraulically driven winch hoist, comprising a support assembly (1); characterized in that: It also includes a hydraulic assembly (2), a winding assembly (3), a positioning assembly (4), a fixing assembly (5), a limiting assembly (6) and a cam transmission assembly (7); the upper end of the support assembly (1) is provided with a hydraulic assembly (2) for braking; the upper end of the support assembly (1) is provided with a winding assembly (3) for winding; The support component (1) is provided with a positioning component (4) for positioning the winding component (3); the support component (1) is provided with a fixing component (5); the fixing component (5) is provided with a limiting component (6) for positioning the cam transmission component (7); and the winding component (3) is provided with a cam transmission component (7) for driving the winding component (3).

2. The hydraulically driven winch hoist according to claim 1, characterized in that: The support assembly (1) comprises a bottom plate (101), a bearing plate (102), a first slot body (103), a first support block (104), a fixing frame (105) and a second support block (106); the upper end of the bottom plate (101) is fixedly connected to the bearing plate (102); the first slot body (103) is penetrated through the upper and lower ends of the bottom plate (101); the upper end of the bearing plate (102) is fixedly connected to a symmetrical first support block (104); the upper end of the first support block (104) is fixedly connected to the fixing frame (105); and the lower end of the fixing frame (105) is fixedly connected to a symmetrical second support block (106).

3. The hydraulically driven winch hoist according to claim 2, characterized in that: The hydraulic assembly (2) comprises a third support block (201), a first fixed plate (202), a bracket (203), a first hydraulic cylinder (204), a second hydraulic cylinder (205) and a push block (206); the upper end of the bottom plate (101) is fixedly connected to two third support blocks (201); the upper end of the third support block (201) is fixedly connected to the first fixed plate (202); the lower end of the first fixed plate (202) is fixedly connected to the bracket (203); the first hydraulic cylinder (204) is fixedly connected to the bracket (203); the right end of the first fixed plate (202) is fixedly connected to the second hydraulic cylinder (205); and the front end of the telescopic rod of the second hydraulic cylinder (205) is fixedly connected to the push block (206).

4. The hydraulically driven winch hoist according to claim 2, characterized in that: The winding assembly (3) comprises a frame (301), a bearing (302), a take-up roller (303) and a positioning groove (304); the upper end of the supporting plate (102) is fixedly connected to the frame (301); the upper end of the frame (301) is fixedly connected to the lower end of the second support block (106); symmetrical bearings (302) are fixedly connected through the left and right ends of the frame (301); a take-up roller (303) is rotatably installed between the two frames (301); and uniform and symmetrical positioning grooves (304) are provided on the outer wall of the take-up roller (303).

5. The hydraulically driven winch hoist according to claim 4, characterized in that: The positioning assembly (4) comprises an electric cylinder (401) and a positioning block (402); the electric cylinder (401) is fixedly connected to the inner wall of the front end of the fixed frame (105); the positioning block (402) is fixedly connected to the lower end of the telescopic rod of the electric cylinder (401); the positioning block (402) is in an inverted "U" shape; the outer wall of the lower end of the positioning block (402) is matched with the inner wall of the positioning groove (304).

6. The hydraulically driven winch hoist according to claim 3, characterized in that: The fixing assembly (5) comprises a mounting tube (501), a positioning column (502), a first through hole (503), a first movable block (504), a fixing block (505) and a positioning hole (506); the outer wall of the telescopic rod of the first hydraulic cylinder (204) is threadedly mounted with the mounting tube (501); the front end of the mounting tube (501) is fixedly connected with the positioning column (502); the rear end of the fixing frame (105) is penetrated by a first through hole (503); the inner wall of the first through hole (503) is in contact with the outer wall of the positioning column (502); the lower end of the fixing frame (105) is movably provided with two first movable blocks (504); the upper end of the first movable block (504) is fixedly connected with the fixing block (505); the rear end of the fixing block (505) is provided with a positioning hole (506); the inner wall of the positioning hole (506) is in contact with the outer wall of the front end of the positioning column (502).

7. The hydraulically driven winch hoist according to claim 2, characterized in that: The limiting assembly (6) comprises a second through hole (601), a mounting post (602), a first limiting block (603) and an internal threaded tube (604); symmetrical second through holes (601) are provided through the left and right ends of the fixed block (505); two mounting posts (602) are movably provided through the left and right ends of the fixed frame (105); the outer wall of the mounting post (602) is fitted with the inner wall of the second through hole (601); the outer wall of the mounting post (602) is sleeved with the first limiting block (603); and the outer wall of the mounting post (602) is threadedly mounted with a plurality of internal threaded tubes (604).

8. The hydraulically driven winch hoist according to claim 4, characterized in that: The cam transmission assembly (7) comprises a connecting column (701), an eccentric wheel (702), an eccentric shaft (703), a limiting ring (704), a connecting rod (705), a second fixed plate (706), a second limiting block (707), a third limiting block (708) and a second movable block (709); the right end of the take-up roller (303) is fixedly connected to the connecting column (701); the right end of the connecting column (701) is fixedly connected to the eccentric wheel (702); the right end of the eccentric wheel (702) is fixedly connected to the eccentric shaft (703); the outer wall of the eccentric shaft (703) is fixedly connected to the limiting ring (704); the outer wall of the eccentric shaft (703) is sleeved with a connecting rod (705); the front end of the first fixed plate (202) is fixedly connected to a symmetrical second fixed plate (706); the ends of the two second fixed plates (706) close to each other are fixedly connected to a second limit block (707) and a third limit block (708); a second movable block (709) is movably arranged between the second limit block (707) and the third limit block (708); the other end of the connecting rod (705) is hinged to the front end outer wall of the second movable block (709); the left and right ends of the connecting rod (705) are in contact with the left and right inner walls of the first limit block (603); the right end of the push block (206) is fixedly connected to the left end of the second movable block (709).

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