Rehabilitation exercise device based on cardiovascular patient

Abstract

The invention discloses a rehabilitation exercise device based on cardiovascular patients, and relates to the technical field of medical care. The rehabilitation bed comprises a rehabilitation bed body. The rehabilitation bed comprises a bed rest; an exercise plate is rotationally arranged on the surface of the bed rest; a first connecting pipe and a wire outlet pipe are symmetrically fixed on the exercise plate; sliding grooves are symmetrically formed in the exercise plate. First piston plates are slidably arranged on the inner walls of the sliding grooves. An electromagnet is arranged in the first piston plate; a permanent magnet is arranged on the inner wall of the chute close to the wire outlet pipe; lifting lugs are fixed to the side faces of the first piston plates. Steel wire ropes are arranged on the lifting lugs; the other end of the steel wire rope is provided with a handle. A patient pulls a steel wire rope downwards and cooperates with force between an electromagnet and a permanent magnet, arm exercise is achieved, meanwhile, the magnetic force of the electromagnet can be adjusted according to the condition of the patient, if the capacity of the patient is weak, the magnetic force of the electromagnet is reduced, and the magnetic force of the electromagnet is slowly increased along with increase of the exercise frequency; and the rehabilitation of the patient is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of medical care, and in particular relates to a rehabilitation exercise device for cardiovascular patients. Background Art

[0002] Cardiovascular and cerebrovascular diseases are a general term for cardiovascular and cerebrovascular diseases, and generally refer to ischemic or hemorrhagic diseases of the heart, brain and systemic tissues caused by hyperlipidemia, blood viscosity, atherosclerosis, hypertension, etc. Cardiovascular and cerebrovascular diseases are common diseases that seriously threaten the health of humans, especially those over 50 years old. They are characterized by high morbidity, high disability and high mortality. Even with the most advanced and complete treatment methods, more than 50% of cerebrovascular accident survivors cannot take care of themselves completely. Every year, 15 million people die from cardiovascular and cerebrovascular diseases worldwide, ranking first among all causes of death.

[0003] At present, for some cardiovascular patients with mild conditions, rehabilitation training is usually carried out on a rehabilitation device moved from the bed. However, for some patients with severe conditions or older patients with limited mobility, it is very difficult to move from the bed to the rehabilitation device, which aggravates the patients' pain.

[0004] To this end, we provide a cardiovascular patient rehabilitation exercise device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a rehabilitation exercise device for cardiovascular patients. The patient pulls down the steel wire rope and adjusts the force between the electromagnet and the permanent magnet to achieve arm exercise, while driving the massage component to massage the leg muscles, relax the leg muscles, and promote blood circulation. This solves the problem that it is very difficult for some existing patients with severe illnesses or older age to move from the bed to the rehabilitation device, which aggravates the pain of the patients.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a rehabilitation exercise device for cardiovascular patients, comprising a rehabilitation bed; the rehabilitation bed comprises a bed board, a bed back, a guardrail and bed legs; a reinforcement rod is connected between each of the bed legs; an exercise board is rotatably arranged on the surface of the bed back; a mounting groove is symmetrically provided on the side of the exercise board; a first connecting pipe is fixed on the inner wall of the mounting groove; an outlet pipe is symmetrically fixed on the bottom surface of the exercise board; a slide groove is symmetrically provided inside the exercise board; the end of the slide groove is connected to the first connecting pipe, and its peripheral side surface is connected to the outlet pipe near the other end; a first piston plate is slidably arranged on the inner wall of the slide groove; an electromagnet is arranged inside the first piston plate; a permanent magnet is arranged on the inner wall of the slide groove near the outlet pipe; a lifting ear is fixed on the side of the first piston plate; a steel wire rope is arranged on the lifting ear; one end of the steel wire rope is wound and fixed on the lifting ear, and the other end thereof passes through the inside of the slide groove and the outlet pipe in sequence, and a handle is arranged.

[0008] The present invention is further configured as follows: a U-shaped limit groove is provided on the side of the bed; a screw rod is rotatably provided on the inner wall of the U-shaped limit groove; a U-shaped limit plate is slidably provided on the inner wall of the U-shaped limit groove; the U-shaped limit plate is rotatably matched with the screw rod thread; the bottom surface of the exercise board is symmetrically provided with a plug-in groove; the U-shaped limit plate is slidably matched with the plug-in groove.

[0009] The present invention is further configured as follows: a conversion groove is opened through the surface of the bed board; an L-shaped conversion frame is symmetrically rotated and arranged on the inner wall of the conversion groove; the L-shaped conversion frame includes a first folding plate and a second folding plate; a baffle is symmetrically fixed on the surface of the first folding plate; and a baffle matching the baffle is symmetrically opened on the inner wall of the conversion groove.

[0010] The present invention is further configured as follows: a massage component is provided on the surface of the second folding plate; the massage component includes a massage plate fixed on the surface of the second folding plate; an arc groove is provided on the surface of the massage plate; a massage groove is provided inside the massage plate; the massage groove runs through the arc groove; and the massage groove extends to the second folding plate.

[0011] The present invention is further configured as follows: a ventilation pipe is fixed to the inner wall of the massage groove; a plurality of shunt pipes are evenly penetrated and fixed on the circumferential side of the ventilation pipe in a linear array; an arc-shaped pipe is penetrated and fixed on the end of the shunt pipe; a plurality of massage pipes are evenly penetrated and fixed on the circumferential side of the arc-shaped pipe in a circular array; the massage pipe is arranged toward the arc-shaped groove.

[0012] The present invention is further configured as follows: a second piston plate is slidably provided on the inner wall of the massage tube; a massage shaft is fixed to the second piston plate; a massage ball is fixed to the end of the massage shaft; and a massage flannel is provided on the inner wall of the arc groove.

[0013] The present invention is further configured as follows: a second connecting pipe is fixedly passed through the side of the second folding plate; the second connecting pipe is connected to the inside of the massage groove; a hose is sealedly connected between the first connecting pipe and the second connecting pipe; and accommodating grooves are symmetrically passed through the surface of the bed board.

[0014] The present invention is further configured as follows: a driving groove is opened inside the bed board; two mutually meshing driving gears are rotatably arranged on the inner wall of the driving groove; a first pulley is fixed to the side of the driving gear; a rotating shaft is fixed to the side of the L-shaped conversion frame; the rotating shaft extends into the driving groove; a second pulley is fixed to the circumferential side of the rotating shaft; a belt is arranged for transmission between adjacent first and second pulleys; a servo motor is fixed to the bottom surface of the driving groove; the output end of the servo motor is fixedly connected to a rotating shaft; the bottom end of the screw rod extends into the driving groove; mutually meshing bevel gears are fixed to the bottom end of the screw rod and the other end of the rotating shaft.

[0015] The present invention has the following beneficial effects:

[0016] 1. The present invention realizes arm exercise by having the patient pull the steel wire rope downward and cooperate with the force between the electromagnet and the permanent magnet. At the same time, the magnetic force of the electromagnet can be adjusted according to the patient's condition. If the patient's ability is weak, the magnetic force of the electromagnet is reduced. As the number of exercises increases, the magnetic force of the electromagnet is slowly increased, which is more conducive to promoting the patient's recovery.

[0017] 2. When the steel wire rope of the present invention is retracted upward, the volume of the enclosed space between the first piston plate and the second piston plate becomes smaller, thereby squeezing the second piston plate, the massage shaft and the massage ball to slide outward to squeeze the leg muscles. When the steel wire rope is pulled downward, the volume of the enclosed space between the first piston plate and the second piston plate becomes larger, thereby squeezing the second piston plate, the massage shaft and the massage ball to slide inward, thereby achieving relaxation of the leg muscles, which is beneficial to dredge the tendons and bones and promote blood circulation.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 The figure is a schematic diagram of the structure of a rehabilitation exercise device for cardiovascular patients.

[0021] Figure 2 For the present invention Figure 1 Another perspective structural diagram of .

[0022] Figure 3 It is a schematic diagram of the structure of the present invention when it is working.

[0023] Figure 4 For the present invention Figure 3 Another perspective structural diagram of .

[0024] Figure 5 It is a structural schematic diagram of the rehabilitation bed of the present invention.

[0025] Figure 6 It is a schematic structural diagram of the massage component of the present invention.

[0026] Figure 7 It is a schematic structural diagram of the exercise board of the present invention.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1-rehabilitation bed, 2-bed board, 3-bed back, 4-guardrail, 5-bed leg, 6-reinforcement rod, 7-exercise board, 8-installation slot, 9-first connecting pipe, 10-outlet pipe, 11-slide slot, 12-first piston plate, 13-lifting ear, 14-wire rope, 15-handle, 16-U-shaped limit slot, 17-screw rod, 18-U-shaped limit plate, 19-plug slot, 20-conversion slot, 21-L-shaped conversion frame, 22-first folding plate, 23-second folding plate, 24-baffle, 25- retaining groove, 26-massage component, 27-massage plate, 28-arc groove, 29-massage groove, 30-ventilation pipe, 31-shunt pipe, 32-arc pipe, 33-massage pipe, 34-second piston plate, 35-massage shaft, 36-massage ball, 37-massage flannel, 38-accommodating groove, 39-driving groove, 40-driving gear, 41-first pulley, 42-rotating shaft, 43-second pulley, 44-belt, 45-servo motor, 46-conical gear. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] For specific embodiment 1, please refer to Figure 1-7The present invention is a rehabilitation exercise device for cardiovascular patients, comprising a rehabilitation bed 1; the rehabilitation bed 1 comprises a bed board 2, a bed back 3, a guardrail 4 and a bed leg 5; a reinforcement rod 6 is connected between each bed leg 5; an exercise board 7 is rotatably arranged on the surface of the bed back 3; a mounting groove 8 is symmetrically provided on the side of the exercise board 7; a first connecting pipe 9 is fixed to the inner wall of the mounting groove 8; an outlet pipe 10 is symmetrically fixed to the bottom surface of the exercise board 7; a slide groove 11 is symmetrically provided inside the exercise board 7; the end of the slide groove 11 is connected to the first connecting pipe 9 The first piston plate 12 is slidably arranged on the inner wall of the slide groove 11; an electromagnet is arranged inside the first piston plate 12; a permanent magnet is arranged on the inner wall of the slide groove 11 near the outlet tube 10; a lifting ear 13 is fixed on the side of the first piston plate 12; a steel wire rope 14 is arranged on the lifting ear 13; one end of the steel wire rope 14 is wound and fixed on the lifting ear 13, and the other end thereof passes through the inside of the slide groove 11 and the outlet tube 10 in turn, and a handle 15 is arranged.

[0031] Specifically, a U-shaped limit groove 16 is provided on the side of the bed support 3; a screw rod 17 is rotatably provided on the inner wall of the U-shaped limit groove 16; a U-shaped limit plate 18 is slidably provided on the inner wall of the U-shaped limit groove 16; the U-shaped limit plate 18 is threadedly rotated with the screw rod 17; a plug-in groove 19 is symmetrically provided on the bottom surface of the exercise plate 7; the U-shaped limit plate 18 is slidably matched with the plug-in groove 19.

[0032] The operation process of this embodiment is as follows: in the initial state, the U-shaped limit plate 18 is plugged into the insertion slot 19, and the exercise board 7 is parallel to the bed support 3. First, the screw rod 17 is rotated to drive the U-shaped limit plate 18 to slide downward along the U-shaped limit slot 16, so that the U-shaped limit plate 18 is separated from the insertion slot 19, and then the exercise board 7 is folded downward to make the exercise board 7 perpendicular to the bed support 3. The patient lies on the rehabilitation bed 1, and the electromagnet is turned on so that the electromagnet and the permanent magnet repel each other with the same polarity. Then the patient holds the handle 15, pull the wire rope 14 downward, thereby driving the first piston plate 12 to slide along the inner wall of the slide groove 11, and when moving upward, the force between the electromagnet and the permanent magnet pushes the first piston plate 12 to slide back, thereby realizing the up and down movement exercise of the arm and promoting the progress of rehabilitation. After the exercise, fold the exercise plate 7 upward, and then rotate the screw rod 17 to drive the U-shaped limit plate 18 to slide upward along the U-shaped limit groove 16, thereby making the U-shaped limit plate 18 plug and match with the plug-in groove 19 to prevent the exercise plate 7 from folding downward by itself.

[0033] In this embodiment, the arm exercise is achieved by the patient pulling the steel wire rope 14 downward and cooperating with the force between the electromagnet and the permanent magnet. At the same time, the magnetic force of the electromagnet can be adjusted according to the patient's condition. If the patient's ability is weak, the magnetic force of the electromagnet is reduced. As the number of exercises increases, the magnetic force of the electromagnet is slowly increased, which is more conducive to promoting the patient's recovery.

[0034] For specific embodiment 2, please refer to Figure 1-7On the basis of the specific embodiment 1, a conversion groove 20 is opened through the surface of the bed board 2; an L-shaped conversion frame 21 is symmetrically arranged on the inner wall of the conversion groove 20; the L-shaped conversion frame 21 includes a first folding plate 22 and a second folding plate 23; a baffle 24 is symmetrically fixed on the surface of the first folding plate 22; a baffle 25 adapted to the baffle 24 is symmetrically opened on the inner wall of the conversion groove 20.

[0035] Specifically, a driving groove 39 is opened inside the bed plate 2; two mutually meshing driving gears 40 are rotatably arranged on the inner wall of the driving groove 39; a first pulley 41 is fixed to the side of the driving gear 40; a rotating shaft 42 is fixed to the side of the L-shaped conversion frame 21; the rotating shaft 42 extends to the inside of the driving groove 39; a second pulley 43 is fixed to the side of the rotating shaft 42; a belt 44 is arranged for transmission between adjacent first pulleys 41 and second pulleys 43; a servo motor 45 is fixed to the bottom surface of the driving groove 39; the output end of the servo motor 45 is fixedly connected to a rotating shaft 42; the bottom end of the screw rod 17 extends to the inside of the driving groove 39; the bottom end of the screw rod 17 and the end of the other rotating shaft 42 are fixed with mutually meshing bevel gears 46.

[0036] The operation process of this embodiment is as follows: in the initial state, the first folding plate 22 is parallel to the bed board 2, the bottom surface of the baffle plate 24 is in contact with the inner bottom surface of the baffle groove 25, and the servo motor 45 is started to drive the corresponding rotating shaft 42 to rotate, thereby driving the corresponding second pulley 43 to rotate, and then driving the corresponding first pulley 41 to rotate through the belt 44, thereby driving the corresponding driving gear 40 to rotate, thereby driving the driving gear 40 meshing therewith to rotate, thereby driving the corresponding first pulley 41 to rotate, thereby driving the corresponding second pulley 43 to rotate through the belt 44, thereby driving the corresponding rotating shaft 42 to rotate, and then the two rotating shafts 42 drive the corresponding L-shaped conversion frame 21 to rotate, so that the L-shaped conversion frame 21 changes from the first folding plate 22 being parallel to the bed board 2 to the second folding plate 23 being parallel to the bed board 2, and while the rotating shaft 42 rotates, it drives the corresponding bevel gear 46 to rotate, thereby driving the bevel gear 46 meshing therewith to rotate, thereby driving the corresponding screw rod 17 to rotate, thereby driving the U-shaped limiting plate 18 to slide downward along the inner wall of the U-shaped limiting groove 16, and then the exercise board 7 is folded downward for exercise.

[0037] For specific embodiment 3, please refer to Figure 1-7 On the basis of the first and second specific embodiments, a massage component 26 is provided on the surface of the second folding plate 23; the massage component 26 includes a massage plate 27 fixed on the surface of the second folding plate 23; an arc groove 28 is provided on the surface of the massage plate 27; a massage groove 29 is provided inside the massage plate 27; the massage groove 29 penetrates the arc groove 28; and the massage groove 29 extends to the second folding plate 23.

[0038] Specifically, a ventilation pipe 30 is fixed to the inner wall of the massage groove 29; a plurality of shunt pipes 31 are evenly penetrated and fixed on the side surface of the ventilation pipe 30 in a linear array; an arc tube 32 is penetrated and fixed on the end of the shunt pipe 31; a plurality of massage tubes 33 are evenly penetrated and fixed on the side surface of the arc tube 32 in a circular array; the massage tube 33 is arranged toward the arc groove 28.

[0039] Furthermore, a second piston plate 34 is slidably provided on the inner wall of the massage tube 33 ; a massage shaft 35 is fixed on the second piston plate 34 ; a massage ball 36 is fixed on the end of the massage shaft 35 ; and a massage flannel 37 is provided on the inner wall of the arc groove 28 .

[0040] Furthermore, a second connecting pipe 37 is fixedly passed through the side of the second folding plate 23; the second connecting pipe 37 is connected to the inside of the massage groove 29; a hose is sealedly connected between the first connecting pipe 9 and the second connecting pipe 37; and a receiving groove 38 is symmetrically opened and passed through the surface of the bed board 2.

[0041] The operation process of this embodiment is as follows: when the second folding plate 23 is parallel to the bed board 2, the second connecting pipe 37 is located inside the accommodating groove 38, and the patient pulls the wire rope 14 to exercise the arms up and down while placing the legs in the arc groove 28, and the first piston plate 12 slides along the inner wall of the slide groove 11. When the wire rope 14 is retracted upward, the first piston plate 12 slides in the direction away from the permanent magnet, and then the volume of the enclosed space between the first piston plate 12 and the second piston plate 34 (slide groove 11, first connecting pipe 9, hose, second connecting pipe 37, ventilation pipe 30, shunt pipe 31, arc pipe 32 and massage pipe 33) becomes smaller, but the air remains unchanged, thereby squeezing the second piston plate 34 along the massage pipe 3 3, the inner wall of the massage shaft 35 and the massage ball 36 slide outward, squeezing the leg muscles. When the steel wire 14 is pulled downward, the first piston plate 12 slides in the direction close to the permanent magnet, and the volume of the enclosed space between the first piston plate 12 and the second piston plate 34 (the slide groove 11, the first connecting pipe 9, the hose, the second connecting pipe 37, the ventilating pipe 30, the shunt pipe 31, the arc pipe 32 and the massage pipe 33) increases, but the air remains unchanged, squeezing the second piston plate 34 to slide inward along the inner wall of the massage pipe 33, and then driving the massage shaft 35 and the massage ball 36 to slide inward, thereby achieving relaxation of the leg muscles, which is beneficial to dredge the tendons and bones and promote blood circulation.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cardiovascular patient rehabilitation exercise device, comprising a rehabilitation bed (1); the rehabilitation bed (1) comprises a bed board (2), a bed back (3), a guardrail (4) and bed legs (5); a reinforcement rod (6) is connected between each of the bed legs (5); the characteristics are: The surface of the bed back (3) is rotatably provided with an exercise plate (7); the side of the exercise plate (7) is symmetrically provided with a mounting groove (8); the inner wall of the mounting groove (8) is fixed with a first connecting pipe (9); the bottom surface of the exercise plate (7) is symmetrically fixed with an outlet pipe (10); The training plate (7) is symmetrically provided with a slide groove (11); the end of the slide groove (11) is connected to the first connecting pipe (9), and the peripheral side surface thereof is connected to the outlet pipe (10) near the other end; A first piston plate (12) is slidably disposed on the inner wall of the slide groove (11); an electromagnet is disposed inside the first piston plate (12); a permanent magnet is disposed on the inner wall of the slide groove (11) near the outlet pipe (10); A lifting ear (13) is fixed on the side of the first piston plate (12); a steel wire rope (14) is arranged on the lifting ear (13); one end of the steel wire rope (14) is wound and fixed on the lifting ear (13), and the other end of the steel wire rope (14) passes through the inside of the slide groove (11) and the outlet pipe (10) in sequence, and is provided with a handle (15).

2. The cardiovascular patient rehabilitation exercise device according to claim 1, characterized in that: A U-shaped limiting groove (16) is provided on the side of the bed support (3); a screw rod (17) is rotatably provided on the inner wall of the U-shaped limiting groove (16); a U-shaped limiting plate (18) is slidably provided on the inner wall of the U-shaped limiting groove (16); the U-shaped limiting plate (18) and the screw rod (17) are threadedly rotatably matched; a plug-in groove (19) is symmetrically provided on the bottom surface of the exercise board (7); the U-shaped limiting plate (18) and the plug-in groove (19) are slidably matched.

3. The cardiovascular patient rehabilitation exercise device according to claim 2, characterized in that: A conversion groove (20) is provided through the surface of the bed board (2); an L-shaped conversion frame (21) is symmetrically arranged on the inner wall of the conversion groove (20); the L-shaped conversion frame (21) comprises a first folding plate (22) and a second folding plate (23); a baffle (24) is symmetrically fixed on the surface of the first folding plate (22); and a baffle groove (25) adapted to the baffle (24) is symmetrically provided on the inner wall of the conversion groove (20).

4. The cardiovascular patient rehabilitation exercise device according to claim 3, characterized in that: A massage component (26) is provided on the surface of the second folding plate (23); the massage component (26) comprises a massage plate (27) fixed on the surface of the second folding plate (23); an arc-shaped groove (28) is provided on the surface of the massage plate (27); a massage groove (29) is provided inside the massage plate (27); the massage groove (29) penetrates the arc-shaped groove (28); and the massage groove (29) extends to the second folding plate (23).

5. The cardiovascular patient rehabilitation exercise device according to claim 4, characterized in that: A ventilation pipe (30) is fixed on the inner wall of the massage groove (29); a plurality of shunt pipes (31) are evenly penetrated and fixed on the circumferential side surface of the ventilation pipe (30) in a linear array; an arc-shaped pipe (32) is evenly penetrated and fixed on the end of the shunt pipe (31); a plurality of massage pipes (33) are evenly penetrated and fixed on the circumferential side surface of the arc-shaped pipe (32) in a circular array; and the massage pipes (33) are arranged toward the arc-shaped groove (28).

6. The cardiovascular patient rehabilitation exercise device according to claim 5, characterized in that: A second piston plate (34) is slidably arranged on the inner wall of the massage tube (33); a massage shaft (35) is fixed on the second piston plate (34); a massage ball (36) is fixed at the end of the massage shaft (35); and a massage flannel (37) is arranged on the inner wall of the arc-shaped groove (28).

7. The cardiovascular patient rehabilitation exercise device according to claim 6, characterized in that: A second connecting pipe (37) is fixedly passed through the side of the second folding plate (23); the second connecting pipe (37) is connected to the inside of the massage groove (29); a hose is sealedly connected between the first connecting pipe (9) and the second connecting pipe (37); and a receiving groove (38) is symmetrically passed through the surface of the bed board (2).

8. The cardiovascular patient rehabilitation exercise device according to claim 7, characterized in that: A driving groove (39) is provided inside the bed plate (2); two mutually meshing driving gears (40) are rotatably provided on the inner wall of the driving groove (39); a first belt pulley (41) is fixed on the side of the driving gear (40); a rotating shaft (42) is fixed on the side of the L-shaped conversion frame (21); the rotating shaft (42) extends into the driving groove (39); a second belt pulley (43) is fixed on the peripheral side of the rotating shaft (42); a belt (44) is provided for transmission between adjacent first belt pulleys (41) and second belt pulleys (43); A servo motor (45) is fixed to the inner bottom surface of the driving groove (39); the output end of the servo motor (45) is fixedly connected to a rotating shaft (42); the bottom end of the screw rod (17) extends into the driving groove (39); and mutually meshing bevel gears (46) are fixed to the bottom end of the screw rod (17) and the end of another rotating shaft (42).

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