CN111991192B - A leg exercise device for orthopaedic rehabilitation with adjustable strength - Google Patents

Abstract

The invention discloses a leg exercising device capable of adjusting force for orthopedic rehabilitation, which comprises an installation shell, transverse plates, a first threaded rod and a second torsion spring, wherein the transverse plates are fixed on the left side and the right side of the installation shell through screws, the first threaded rod is connected to the inner bearing of the upper surface of the transverse plate, the outer side of the rear end of the first threaded rod is in key connection with a first rope winding disc, a first connecting rope is fixed on the outer side of the first rope winding disc through a winding screw, the second threaded rod is connected to the inner bearing of the installation shell, the outer side of the second threaded rod is in threaded connection with a sleeve, the upper bearing of the front end of the sleeve is connected with a third transmission gear, the upper bearing of the rear end of the sleeve is connected with a second transmission gear, and the first transmission gear is arranged on the left side and the right side of the sleeve. This can be provided with second drive gear and third drive gear to the recovered shank exercise device of using of orthopedics of power regulation, be convenient for adjust the training dynamics from this, satisfy different use crowds' demand.

Description

A leg exercise device for orthopaedic rehabilitation with adjustable strength

technical field

The invention relates to the technical field of orthopedic rehabilitation, in particular to a leg exercise device for orthopedic rehabilitation that can adjust the strength.

Background technique

In the later stage of the treatment of orthopedic diseases, rehabilitation exercises are also needed to facilitate the recovery of orthopedic diseases. At present, there are rehabilitation exercises for orthopedic diseases through the auxiliary use of rehabilitation training equipment on the market, so that orthopedic diseases can be quickly cured. Recovery, due to the various locations of orthopedic diseases, there are also various orthopedic diseases, and the exercise equipment used in the rehabilitation treatment for different positions is also different. At present, there are special training equipment for the legs on the market. Although there are many types of leg exercise devices for orthopaedic rehabilitation on the market, there are still some shortcomings in the process of use, such as:

1. The training intensity of the existing leg exercise device for orthopaedic rehabilitation is fixed, so that when used on patients with different degrees of injury, it cannot well meet the rehabilitation training requirements of different patients, so that the leg exercise device for orthopaedic rehabilitation is used. low practicality;

2. When using the patient, because the patient's leg is injured, the foot cannot exert force well, and the foot needs to be fixed during exercise, so that the foot can drive the leg for training, but the existing The structure of the fixed foot is complex, the operation is more complicated, and it is time-consuming and labor-intensive.

Therefore, we propose a leg exercise device for orthopaedic rehabilitation that can be adjusted in strength, so as to solve the above-mentioned problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a leg exercise device for orthopaedic rehabilitation that can adjust the strength, so as to solve the problem that the existing leg exercise device for orthopaedic rehabilitation on the market cannot adjust the training strength and fix the foot. The structure of the department is complex, the operation is more complicated, and the problem is time-consuming and labor-intensive.

In order to achieve the above purpose, the present invention provides the following technical solutions: a leg exercise device for orthopaedic rehabilitation with adjustable strength, comprising a mounting shell, a transverse plate, a first threaded rod and a second torsion spring, and the left and right sides of the mounting shell are The horizontal plate is fixed with screws on both sides, and the inner bearing of the upper surface of the horizontal plate is connected with a first threaded rod, and the outer key of the rear end of the first threaded rod is connected with a first rope reel. The outer winding screw is fixed with a first connecting rope, the inner bearing of the mounting shell is connected with a second threaded rod, the outer side of the second threaded rod is threaded with a sleeve, and the bearing above the front end of the sleeve is connected with a third transmission gear The upper bearing at the rear end of the sleeve is connected with a second transmission gear, and the left and right sides of the sleeve are provided with a first transmission gear, and the first transmission gear is connected with the mounting shell bearing, and the second threaded rod is The front end penetrates the front side of the installation shell, a placing plate is arranged above the front end of the first threaded rod, and the left and right sides of the placing plate are screwed with first limit blocks, and the inner walls of the left and right sides of the horizontal plate are provided with openings. There is a first limit slot, and the inside of the first limit slot is snapped and connected with a first limit block, the bottom screw of the sleeve is installed with a second limit block, and the inner wall of the lower surface of the installation shell is opened There is a second limit slot, and a second limit block is connected to the inside of the second limit slot, and a pressing plate is arranged above the placing plate, and a rubber block is arranged below the pressing plate, so A rubber block is placed inside the upper part of the placing plate, and a connecting block is fixed with a screw at the bottom of the placing plate, and a first threaded rod is threadedly connected to the inner part of the connecting block; Four transmission gears and a fifth transmission gear, and a fifth transmission gear is meshed above the fourth transmission gear, a second torsion spring is nested outside the front end of the first threaded rod, and the rear end of the second torsion spring It is screwed with the first threaded rod, and the front end of the second torsion spring is screwed with the transverse plate.

Preferably, a first installation shaft is connected with a key through the inner middle of the first transmission gear, and a second rope reel is arranged below the first transmission gear, and the inner key of the second rope reel is connected with the first installation shaft. The shaft rod is installed, and the outer side of the second rope reel is wound and connected with the first connecting rope.

Preferably, the inner key of the second transmission gear is connected with a second installation shaft, and the bottom end of the second installation shaft is connected with the sleeve bearing, and the diameter of the second transmission gear is smaller than that of the first transmission gear.

Preferably, the inner key of the third transmission gear is connected with a third installation shaft, and the bottom end of the third installation shaft is connected with the sleeve bearing, and the diameter of the third transmission gear is larger than that of the first transmission gear.

Preferably, the sleeve is slidably connected to the mounting shell through a second threaded rod, and the length of the sleeve is smaller than the length of the second threaded rod.

Preferably, the left and right inner walls of the placing plate are provided with a chute and a third limit slot, and the outer side of the chute is provided with a third limit slot.

Preferably, a rubber pad is fixed with a middle screw at the bottom of the extrusion plate, racks are screwed on the lower ends of the left and right sides of the extrusion plate, and a third limit block is fixed with screws on the outer side of the rack. The limit block is engaged and slidably connected with the third limit groove.

Preferably, sliding rods are screwed on both the left and right sides of the rubber block, a return spring is fixed with screws at the bottom of the rubber block, the bottom end of the restoring spring is screwed with the placing plate, and the sliding rod is engaged with the chute and slides connect.

Preferably, the front end of the fourth transmission gear is provided with a third rope reel, and a fourth installation shaft is connected through a key between the middle of the fourth transmission gear and the third rope reel, and the third rope reel A second connecting rope is installed on the outer winding screw of the fourth installation shaft, and the rear end of the fourth installation shaft is connected with the placement plate bearing, and a first torsion spring is nested outside the rear end of the fourth installation shaft, and the first torsion spring The front end of the first torsion spring is screwed with the fourth mounting shaft, and the rear end of the first torsion spring is screwed with the placement plate.

Compared with the prior art, the beneficial effects of the present invention are: the strength-adjustable leg exercise device for orthopaedic rehabilitation:

(1) A second transmission gear and a third transmission gear are provided, the diameter of the second transmission gear is smaller than that of the third transmission gear, and the meshing connection between the second transmission gear or the third transmission gear and the first transmission gear is convenient. Adjust the rotation speed of the first transmission gear, so as to facilitate the first transmission gear to adjust the rotation speed of the first threaded rod through the first rope reel and the first connecting rope, so as to adjust the forward and backward movement speed of the placing plate, and to facilitate the adjustment of the legs. The training frequency is adjusted, which is convenient to adjust the training intensity to meet the needs of different users;

(2) A casing is installed, and the casing and the second threaded rod are threadedly connected, and then the rotation of the second threaded rod can drive the casing to move, so as to adjust the positions of the second transmission gear and the third transmission gear. ;

(3) The rubber block is fixed, and the gravity of the feet and legs drives the rubber block to move downward, so that the rubber block drives the third rope reel and the fourth installation shaft connected by the key to rotate through the second connecting rope, and then rotates. The fourth installation shaft drives the fourth transmission gear to rotate, so that the fourth transmission gear drives the fifth transmission gear with a smaller diameter to rotate, so that the fifth transmission gear drives the rack to descend. The diameter is smaller than the diameter of the fourth transmission gear, which makes the rack descend faster, so that the rack drives the extrusion plate and the rubber pad to descend well to extrude and fix the foot above the rubber block. The operation is simple and convenient. The feet need to be placed on the rubber block, and no staff operation is required, which saves time and effort.

Description of drawings

Fig. 1 is the top sectional structure schematic diagram of the present invention;

Fig. 2 is the left cross-sectional structural schematic diagram of the installation shell of the present invention;

FIG. 3 is a left cross-sectional structural schematic diagram of the connection between the first transmission gear and the installation shell of the present invention;

Fig. 4 is the top view structure schematic diagram of the present invention;

5 is a schematic diagram of the main cross-sectional structure of the placement plate of the present invention;

Fig. 6 is a schematic view of the enlarged structure at the place A in Fig. 5 of the present invention;

FIG. 7 is a left cross-sectional structural schematic diagram of the connection between the placing plate and the fourth transmission gear according to the present invention.

In the figure: 1, the installation shell; 2, the horizontal plate; 3, the first threaded rod; 4, the first rope reel; 5, the first connecting rope; 6, the first transmission gear; 61, the first installation shaft; 62, the second rope reel; 7, the second transmission gear; 71, the second installation shaft; 8, the third transmission gear; 81, the third installation shaft; 9, the sleeve; 10, the second threaded rod; 11. Placing plate; 111, Chute; 112, Third limit slot; 12, First limit block; 13, First limit slot; 14, Second limit block; 15, Second limit slot; 16, squeeze plate; 161, rubber pad; 162, rack; 163, third limit block; 17, rubber block; 171, slide bar; 172, return spring; 18, connecting block; 19, fourth transmission gear ; 191, the third rope reel; 192, the fourth installation shaft; 193, the second connecting rope; 194, the first torsion spring; 20, the fifth transmission gear; 21, the second torsion spring.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-7, the present invention provides a technical solution: a leg exercise device for orthopaedic rehabilitation with adjustable strength, comprising a mounting shell 1, a transverse plate 2, a first threaded rod 3, and a first rope reel 4. The first connecting rope 5, the first transmission gear 6, the first installation shaft 61, the second rope reel 62, the second transmission gear 7, the second installation shaft 71, the third transmission gear 8, the third installation Shaft 81, sleeve 9, second threaded rod 10, placing plate 11, chute 111, third limit groove 112, first limit block 12, first limit groove 13, second limit block 14, The second limit groove 15, the squeeze plate 16, the rubber pad 161, the rack 162, the third limit block 163, the rubber block 17, the sliding rod 171, the return spring 172, the connecting block 18, the fourth transmission gear 19, the first The three winding rope reels 191, the fourth installation shaft 192, the second connection rope 193, the first torsion spring 194, the fifth transmission gear 20 and the second torsion spring 21, the left and right sides of the installation shell 1 are screwed with horizontal plates 2, and the inner bearing of the upper surface of the horizontal plate 2 is connected with a first threaded rod 3, and the outer key of the rear end of the first threaded rod 3 is connected with a first rope reel 4, and the outer side of the first rope reel 4 is wound with screws to fix There is a first connecting rope 5, a second threaded rod 10 is connected to the inner bearing of the mounting shell 1, and a sleeve 9 is threadedly connected to the outer side of the second threaded rod 10, and the bearing above the front end of the sleeve 9 is connected to a third transmission gear 8. The bearing above the rear end of the sleeve 9 is connected with the second transmission gear 7, and the left and right sides of the sleeve 9 are provided with the first transmission gear 6, and the first transmission gear 6 is connected with the bearing of the mounting shell 1, and the second The front end of the threaded rod 10 penetrates through the front side of the installation shell 1 , a placing plate 11 is provided above the front end of the first threaded rod 3 , and the left and right sides of the placing plate 11 are screwed with a first limit block 12 , and the horizontal plate 2 The inner walls of the left and right sides are provided with a first limit groove 13, and the first limit block 12 is connected to the inside of the first limit groove 13 by engaging and sliding, and the bottom screw of the sleeve 9 is installed with a second limit block 14. A second limiting slot 15 is defined on the inner wall of the lower surface of the mounting shell 1 , and a second limiting block 14 is engaged and slidably connected to the inside of the second limiting slot 15 , and a pressing plate 16 is arranged above the placing plate 11 , and A rubber block 17 is arranged under the pressing plate 16 , a rubber block 17 is placed inside the upper part of the placing plate 11 , and the bottom of the placing plate 11 is screwed with a connecting block 18 , and the interior of the connecting block 18 is threadedly connected with a first threaded rod 3. The inner walls on the left and right sides of the upper end of the placing plate 11 are bearing-connected with the fourth transmission gear 19 and the fifth transmission gear 20, and the fifth transmission gear 20 is meshed and connected above the fourth transmission gear 19. A second torsion spring 21 is nested on the outside of the front end, and the rear end of the second torsion spring 21 is screwed with the first threaded rod 3, and the front end of the second torsion spring 21 is screwed with the horizontal plate 2;

A first installation shaft 61 is connected with a key through the inner middle of the first transmission gear 6, and a second rope reel 62 is arranged below the first transmission gear 6, and the inner key of the second rope reel 62 is connected with a first The shaft 61 is installed, and the outer side of the second rope reel 62 is wound with the first connecting rope 5, and then the second rope reel 62 can be driven to rotate by the rotation of the first transmission gear 6 and the first installation shaft 61, Then, the second rope reel 62 is rotated to pull the first connecting rope 5 to drive the first threaded rod 3 to rotate;

The inner key of the second transmission gear 7 is connected with a second installation shaft 71 , and the bottom end of the second installation shaft 71 is bearingly connected with the sleeve 9 , and the diameter of the second transmission gear 7 is smaller than that of the first transmission gear 6 . , the diameter of the second transmission gear 7 is smaller than the diameter of the first transmission gear 6, so that the second transmission gear 7 can control the rotational speed of the first transmission gear 6;

The inner key of the third transmission gear 8 is connected with a third installation shaft 81 , and the bottom end of the third installation shaft 81 is bearingly connected with the sleeve 9 , and the diameter of the third transmission gear 8 is larger than that of the first transmission gear 6 , the diameter of the third transmission gear 8 is larger than the diameter of the first transmission gear 6, so that the third transmission gear 8 can control the rotational speed of the first transmission gear 6;

The sleeve 9 forms a sliding connection with the installation shell 1 through the second threaded rod 10, and the length of the sleeve 9 is less than the length of the second threaded rod 10, and then the second transmission gear 7 and the third transmission gear 8 can be driven by the sleeve 9 to move;

The left and right inner walls of the placing plate 11 are provided with chute 111 and a third limit slot 112 , and the outer side of the chute 111 is provided with a third limit slot 112 , through which the slide bar 171 can be easily snapped and installed ;

The bottom middle screw of the extrusion plate 16 is fixed with a rubber pad 161, and the lower ends of the left and right sides of the extrusion plate 16 are screwed with a rack 162, and the outer side of the rack 162 is screwed with a third limit block 163. The three limiting blocks 163 are engaged and slidably connected with the third limiting groove 112, so that the upper surface of the foot can be easily squeezed and fixed through the arc-shaped rubber pad 161;

Both the left and right sides of the rubber block 17 are screwed with sliding rods 171 , and the bottom of the rubber block 17 is screwed with a return spring 172 , and the bottom end of the return spring 172 is screwed with the placing plate 11 , and the sliding rod 171 is connected to the chute 111 The snap-fit sliding connection facilitates the adjustment of the height of the pressing plate 16 through the rubber block 17;

The front end of the fourth transmission gear 19 is provided with a third rope reel 191, and a fourth installation shaft 192 is connected to the middle of the fourth transmission gear 19 and the third rope reel 191 through a key, and the third rope reel The outer side of the 191 is wound with a second connecting rope 193, and the rear end of the fourth installation shaft 192 is connected to the bearing plate 11, and the outer rear end of the fourth installation shaft 192 is nested with a first torsion spring 194. , and the front end of the first torsion spring 194 is screwed with the fourth installation shaft 192, and the rear end of the first torsion spring 194 is screwed with the placing plate 11, so that the fourth installation shaft can be driven by the third rope reel 191 The lever 192 and the fourth transmission gear 19 rotate.

The working principle of this embodiment: when using the strength-adjustable orthopaedic rehabilitation leg exercise device, first move the entire device into the working area as shown in FIG. 4 , and place the entire device on the seat after reaching the working area. chair or bedside, and then the user sits on the seat or bedside, then as shown in Figures 3-5, the user places their feet on the rubber block 17, and drives the rubber block 17 to descend through the weight of the feet themselves , so that the rubber block 17 squeezes the return spring 172, so as to drive the rubber block 17 to reset through the stored force of the return spring 172 in the later stage, and then the rubber block 17 is lowered as shown in Fig. 5-7 to the second connecting rope 193 is pulled, and at the same time, the slide bar 171 slides in the chute 111, so as to ensure the stable descent of the rubber block 17. When the second connecting rope 193 is pulled, it drives the third rope reel 191 to rotate, so that the third rope reel 191 rotates. 191 drives the fourth installation shaft 192 connected by the inner key to rotate, so that the fourth installation shaft 192 drives the fourth transmission gear 19 connected by the outer key to rotate;

The fourth transmission gear 19 drives the meshed fifth transmission gear 20 to rotate when rotating, so that the fifth transmission gear 20 drives the meshed and connected rack 162 to descend, and the third limit block 163 on the outside of the rack 162 is in the The third limiting groove 112 is engaged and slidingly connected, so as to ensure the stable descending of the rack 162. Since the diameter of the fifth transmission gear 20 is smaller than the diameter of the fourth transmission gear 19, the rotational speed of the fifth transmission gear 20 is greater than that of the fourth transmission gear 19. The speed of the fourth transmission gear 19 makes the rack 162 descend faster than the rubber block 17, so that the pressing plate 16 drives the rubber pad 161 to squeeze and fix the foot above the rubber block 17. The operation is simple and convenient, just place the foot directly on the rubber block 17 without manual operation;

Then, as shown in Figures 1-3, when the strength needs to be adjusted to a small value, the front end of the second threaded rod 10 is manually rotated, so that the second threaded rod 10 drives the outer threaded sleeve 9 to move when it rotates. When the second limit block 14 at the bottom of the sleeve 9 slides in the second limit groove 15 in the installation shell 1, so as to ensure the stable movement of the sleeve 9, so that the sleeve 9 drives the second transmission gear 7 It moves with the third transmission gear 8. When the second transmission gear 7 meshes with the first transmission gear 6 on the left and right sides, the rotation of the second threaded rod 10 is stopped, and the top end of the second installation shaft 71 is connected to the servo motor. connected, so that the second installation shaft 71 rotates, so that the second installation shaft 71 drives the second transmission gear 7 connected by the outer key to rotate, and the second transmission gear 7 drives the first transmission gear 6 to rotate. The diameter of the transmission gear 7 is smaller than the diameter of the first transmission gear 6, so that the rotational speed of the second transmission gear 7 is greater than the rotational speed of the first transmission gear 6, and the first transmission gear 6 rotates as shown in Figures 1 and 3 The first rope reel 4 is driven to rotate by the second rope reel 62 and the first connecting rope 5, so that the first rope reel 4 drives the first threaded rod 3 connected by the internal key to rotate, as shown in FIG. 5 . The rotation of the first threaded rod 3 drives the connecting block 18 connected to the outer threaded connection to move, and at the same time, when the first threaded rod 3 rotates, the second torsion spring 21 is stored, so that the second torsion spring 21 is stored in the later stage. The first threaded rod 3 is driven to rotate in the opposite direction, and the first limit block 12 and the first limit groove 13 are engaged and connected to ensure that the connecting block 18 moves stably, and the connecting block 18 drives the placing plate 11 to move. To move, through the storage force of the second torsion spring 21 and the setting of the servo motor, the placing plate 11 can be driven to reciprocate back and forth, so that the placing plate 11 can drive the legs to open and bend, so as to facilitate the exercise work. When the intensity of the exercise is increased, as shown in FIG. 1, similarly, as shown above, the second threaded rod 10 is rotated in the opposite direction, so that the third transmission gear 8 is meshed with the first transmission gear 6, thereby making the The rotation speed of a transmission gear 6 is increased, so as to increase the moving speed of the placing board 11, thereby increasing the training intensity, thereby completing a series of tasks.

Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the foregoing embodiments, or to perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (1)

1. The utility model provides a device is tempered to recovered shank of using of orthopedics that can adjust power, includes installation shell (1), diaphragm (2), first threaded rod (3) and second torsion spring (21), its characterized in that: the left side and the right side of the mounting shell (1) are both fixed with transverse plates (2) by screws, the inner bearing of the upper surface of the transverse plate (2) is connected with a first threaded rod (3), the outer side of the rear end of the first threaded rod (3) is connected with a first rope winding disc (4) by a key, the outer side of the first rope winding disc (4) is wound with a first connecting rope (5) by screws, the inner bearing of the mounting shell (1) is connected with a second threaded rod (10), the outer side of the second threaded rod (10) is connected with a sleeve (9) by threads, the upper bearing of the front end of the sleeve (9) is connected with a third transmission gear (8), the upper bearing of the rear end of the sleeve (9) is connected with a second transmission gear (7), the left side and the right side of the sleeve (9) are both provided with first transmission gears (6), and the first transmission gears (6) are in bearing connection with the mounting shell (1), the front end of the second threaded rod (10) penetrates through the front side face of the mounting shell (1), a placing plate (11) is arranged above the front end of the first threaded rod (3), first limit blocks (12) are mounted on the left side and the right side of the placing plate (11) through screws, first limit grooves (13) are formed in the inner walls of the left side and the right side of the transverse plate (2), the first limit blocks (12) are connected to the inner portions of the first limit grooves (13) in a clamping and sliding mode, second limit blocks (14) are mounted on the bottom of the sleeve (9) through screws, second limit grooves (15) are formed in the inner wall of the lower surface of the mounting shell (1), second limit blocks (14) are connected to the inner portions of the second limit grooves (15) in a clamping and sliding mode, an extrusion plate (16) is arranged above the placing plate (11), a rubber block (17) is arranged below the extrusion plate (16), and a rubber block (17) is arranged inside the placing plate (11), a connecting block (18) is fixed to the bottom of the placing plate (11) through screws, a first threaded rod (3) is connected to the inner threads of the connecting block (18), a fourth transmission gear (19) and a fifth transmission gear (20) are connected to the inner walls of the left side and the right side of the upper end of the placing plate (11) in a bearing mode, the fifth transmission gear (20) is connected to the upper portion of the fourth transmission gear (19) in a meshed mode, a second torsion spring (21) is arranged on the outer side of the front end of the first threaded rod (3) in an embedded mode, the rear end of the second torsion spring (21) is connected with the first threaded rod (3) through screws, and the front end of the second torsion spring (21) is connected with the transverse plate (2) through screws;

a first mounting shaft lever (61) is connected to the middle of the inside of the first transmission gear (6) in a penetrating manner, a second rope winding disc (62) is arranged below the first transmission gear (6), the inside of the second rope winding disc (62) is connected with the first mounting shaft lever (61) in a key manner, and a first connecting rope (5) is wound and connected to the outer side of the second rope winding disc (62);

the inner key of the second transmission gear (7) is connected with a second mounting shaft lever (71), the bottom end of the second mounting shaft lever (71) is in bearing connection with the sleeve (9), and the diameter of the second transmission gear (7) is smaller than that of the first transmission gear (6);

the inner key of the third transmission gear (8) is connected with a third mounting shaft lever (81), the bottom end of the third mounting shaft lever (81) is in bearing connection with the sleeve (9), and the diameter of the third transmission gear (8) is larger than that of the first transmission gear (6);

the sleeve (9) is in sliding connection with the mounting shell (1) through a second threaded rod (10), and the length of the sleeve (9) is smaller than that of the second threaded rod (10);

the inner walls of the left side and the right side of the placing plate (11) are both provided with a sliding chute (111) and a third limiting groove (112), and the outer side of the sliding chute (111) is provided with the third limiting groove (112);

a rubber pad (161) is fixed at the middle of the bottom of the extrusion plate (16) through a screw, racks (162) are installed at the lower ends of the left side and the right side of the extrusion plate (16) through screws, a third limiting block (163) is fixed at the outer side of each rack (162) through a screw, and the third limiting block (163) is clamped with the third limiting groove (112) in a sliding connection mode;

the left side and the right side of the rubber block (17) are respectively provided with a sliding rod (171) through a screw, the bottom of the rubber block (17) is fixedly provided with a return spring (172) through a screw, the bottom end of the return spring (172) is in screw connection with the placing plate (11), and the sliding rods (171) are in clamping sliding connection with the sliding grooves (111);

the front end of the fourth transmission gear (19) is provided with a third rope winding disc (191), a fourth mounting shaft rod (192) penetrates through the middle inner portions of the fourth transmission gear (19) and the third rope winding disc (191) in a key connection mode, a second connecting rope (193) is installed on the outer side of the third rope winding disc (191) in a winding mode through screws, the rear end of the fourth mounting shaft rod (192) is in bearing connection with the placing plate (11), a first torsion spring (194) is arranged on the outer side of the rear end of the fourth mounting shaft rod (192) in a nested mode, the front end of the first torsion spring (194) is in screw connection with the fourth mounting shaft rod (192), and the rear end of the first torsion spring (194) is in screw connection with the placing plate (11).

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