CN114631926A

CN114631926A - Cold compress physiotherapy device for abdominal trauma in emergency surgery

Info

Publication number: CN114631926A
Application number: CN202210261776.3A
Authority: CN
Inventors: 郑立忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-06-17

Abstract

The invention relates to a cold compress physiotherapy device for abdominal trauma in emergency surgery, which comprises a lying plate and a transverse plate arranged on the lying plate and parallel to the lying plate, the transverse plate is connected with an electric lifting mechanism arranged on the lying plate, a combined plate is movably arranged on the transverse plate through an elastic mechanism and is arranged in a U shape, and a round roller is rotatably arranged on the elastic mechanism, a towel is arranged on the periphery of the round roller, the elastic mechanism is also connected with a thread compression mechanism, the thread compression mechanism is arranged on the transverse plate, and is connected with the electric lifting mechanism through a one-way transmission mechanism, the bottom of the lying plate is also provided with a reciprocating driving mechanism, and the reciprocating driving mechanism is connected with the electric lifting mechanism, finally, the cold compress process is realized step by step, an adaptive process is provided for a patient, and the problem that the injured part of the abdomen of the patient feels uncomfortable due to the overlarge cold compress force at the beginning is prevented.

Description

Cold compress physiotherapy device for abdominal trauma in emergency surgery

Technical Field

The invention relates to the technical field related to medical instruments, in particular to a cold compress physiotherapy device for abdominal trauma in emergency surgery.

Background

Cold compress is an important measure for clinical treatment and nursing of injured patients, namely, ice bags or cold wet towels are applied to the skin of the forehead, the back of the neck or the affected part. Is applied to the affected part to promote local vasoconstriction, control bleeding of small blood vessels, relieve pain of mass with large tension, and relieve swelling and pain. For patients with high fever, it can be applied on head, forehead and neck to lower body temperature and improve discomfort.

However, the existing cold compress device is applied to some trauma patients, the cold compress force is fixed, and the patients do not have a buffer adaptation process at first, so that the injured part of the patient can generate pain due to the initially excessive cold compress force, and the ideal treatment effect can not be achieved.

Disclosure of Invention

The invention aims to provide a cold compress physiotherapy device for abdominal trauma in emergency surgery, which solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a cold compress physiotherapy device for abdominal trauma in emergency surgery comprises a lying plate and a transverse plate which is arranged on the lying plate and is parallel to the lying plate, wherein the transverse plate is connected with an electric lifting mechanism arranged on the lying plate;

a combined plate is movably arranged on the transverse plate through an elastic mechanism, the combined plate is U-shaped and is rotatably provided with a round roller, and a towel for cold compress of the abdomen of a patient is detachably connected to the periphery of the round roller;

the elastic mechanism is also connected with a thread compression mechanism, and the thread compression mechanism is arranged on the transverse plate and is connected with the electric lifting mechanism through a one-way transmission mechanism;

and the bottom of the lying plate is also provided with a reciprocating driving mechanism, and the reciprocating driving mechanism is connected with the electric lifting mechanism.

As a further scheme of the invention: electric lift mechanism includes respectively fixed mounting the both sides of service creeper and with two risers of service creeper looks vertically and the setting of sliding are in expansion plate in the riser, diaphragm fixed mounting is two between the expansion plate, and one of them electric telescopic handle is installed to the lateral part of riser, electric telescopic handle's expansion end together the lateral part of expansion plate is fixed.

As a still further scheme of the invention: still fixed mounting has the mounting bracket in the bottom of service creeper, the mounting bracket is "L" shape setting, reciprocating drive mechanism installs including rotating the cam and the fixed mounting of mounting bracket are in driving motor on the mounting bracket, driving motor's output with the rotation axis connection of cam, the cam is connected with installs the elastic sliding component of service creeper bottom.

As a still further scheme of the invention: the elastic sliding assembly comprises two guide rods fixedly arranged at the bottom of the lying plate, a sliding plate arranged on the two guide rods in a sliding mode and a first spring sleeved on the periphery of the guide rods, and the cam is abutted to the side portion of the sliding plate;

the two ends of the sliding plate are respectively fixed with the two vertical plates, one end of the first spring is connected with the sliding plate, and the other end of the first spring is connected with the end of the guide rod.

As a still further scheme of the invention: the elastic mechanism comprises two cross rods fixedly arranged on the transverse plates and two sliding blocks symmetrically arranged on the two cross rods in a sliding manner, and the two sliding blocks are connected with the combined plate through two supporting rods respectively;

the two ends of the supporting rod are respectively connected with the combined plate and the sliding block in a rotating mode, two second springs are sleeved on the two cross rods respectively, one end of each second spring is connected with the corresponding sliding block, and the other end of each second spring is connected with the corresponding thread compression mechanism.

As a still further scheme of the invention: the thread compression mechanism comprises a bidirectional screw rod rotatably mounted on the transverse plate and two thread plates symmetrically and slidably arranged on the two transverse rods, and the thread plates are connected with one end, far away from the sliding block, of the second spring;

the bidirectional screw rod penetrates through the two thread plates, the two thread plates are in threaded connection with the bidirectional screw rod, and one end of the bidirectional screw rod is connected with the one-way transmission mechanism.

As a still further scheme of the invention: the one-way transmission mechanism comprises a ratchet wheel rotatably mounted on the side part of the vertical plate and a long slat fixedly mounted on the lying plate, and a rotating shaft of the ratchet wheel is connected with the two-way screw rod through a movable connecting structure;

wherein, a plurality of inclined grooves have been seted up along its length direction equidistance on the rectangular board, and every all rotate in the inclined groove and install a pawl.

As a still further scheme of the invention: the movable connecting structure comprises a first connecting rod and a second connecting rod, the head ends of the first connecting rod and the second connecting rod are rotatably connected through a shaft piece, the tail end of the first connecting rod is rotatably connected with the rotating shaft of the ratchet wheel, and the tail end of the second connecting rod is rotatably connected with the bidirectional screw rod;

the shaft element is connected with a rotating shaft of the ratchet wheel through a first transmission belt and is also connected with the bidirectional screw rod through a second transmission belt.

Compared with the prior art, the invention has the beneficial effects that: the invention has novel design, when the reciprocating driving mechanism works, the vertical plate can reciprocate in the horizontal direction, when the vertical plate moves towards one side, the one-way transmission mechanism can trigger the movement and drive the two-way screw rod to rotate, so that the two thread plates are simultaneously in thread fit with the two-way screw rod and move close to each other, the second spring is compressed, and the two sliding blocks enable the pressure of the round roller on the abdomen of a patient to be gradually increased through the supporting rod.

Drawings

Fig. 1 is a schematic structural view showing an embodiment of a cold compress physiotherapy apparatus for abdominal trauma in emergency surgery.

Fig. 2 is a schematic structural view of another angle of an embodiment of a cold compress physiotherapy device for abdominal trauma in emergency surgery.

Fig. 3 is a schematic structural view of another angle of an embodiment of a cold compress physiotherapy device for abdominal trauma in emergency surgery.

Fig. 4 is an enlarged view of a structure at a in fig. 3.

Fig. 5 is a schematic structural view of an elastic mechanism in an embodiment of a cold compress physiotherapy device for abdominal trauma in emergency surgery.

Fig. 6 is a schematic structural diagram of a one-way transmission mechanism in one embodiment of a cold compress physiotherapy device for abdominal trauma in emergency surgery.

In the figure: 1. a lying board; 2. a round roller; 3. a towel; 4. a vertical plate; 5. a retractable plate; 6. a transverse plate; 7. an electric telescopic rod; 8. a guide bar; 9. a slide plate; 10. a first spring; 11. a drive motor; 12. a cam; 13. a mounting frame; 14. a cross bar; 15. a slider; 16. a support bar; 17. a limiting rod; 18. a bidirectional screw rod; 19. a thread plate; 20. a composition board; 21. a first link; 22. a second link; 23. a first drive belt; 24. a second belt; 25. a shaft member; 26. a ratchet wheel; 27. a strip plate; 28. a second spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, an element of the present invention may be said to be "fixed" or "disposed" to another element, either directly on the other element or with intervening elements present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Referring to fig. 1-6, in an embodiment of the present invention, a cold compress physiotherapy device for abdominal trauma in emergency surgery includes a lying plate 1 and a transverse plate 6 disposed on and parallel to the lying plate 1, wherein the transverse plate 6 is connected to an electric lifting mechanism mounted on the lying plate 1. The transverse plate 6 is movably provided with a combined plate 20 through an elastic mechanism, the combined plate 20 is U-shaped and is rotatably provided with a round roller 2, and the periphery of the round roller 2 is detachably connected with a towel 3 for cold compressing the abdomen of a patient.

Specifically, in actual use, the towel 3 may be wrapped around the circumference of the round roller 2 by a hook and loop fastener or a strap, and the specific connection manner between the towel 3 and the round roller 2 is not specifically limited in this application and may be selected according to actual requirements.

The elastic mechanism is further connected with a thread compression mechanism, and the thread compression mechanism is arranged on the transverse plate 6 and connected with the electric lifting mechanism through a one-way transmission mechanism. And the bottom of the lying plate 1 is also provided with a reciprocating driving mechanism, and the reciprocating driving mechanism is connected with the electric lifting mechanism.

Please refer to fig. 2 again, electric lift mechanism includes respectively fixed mounting in the both sides of service creeper 1 and with two risers 4 of service creeper 1 looks vertically and the slip setting are in expansion plate 5 in the riser 4, 6 fixed mounting of diaphragm is two between expansion plate 5, and one of them electric telescopic handle 7 is installed to the lateral part of riser 4, electric telescopic handle 7's expansion end with expansion plate 5's lateral part is fixed.

It should be noted that, the electric telescopic rod 7 can also be replaced by an air cylinder or a hydraulic cylinder, as long as the driving requirement is met, and therefore, the application is not specifically limited.

When the cold compress device is used, the electric telescopic rod 7 works, the telescopic plate 5 can be driven to slide towards the inside or the outside of the vertical plate 4, correspondingly, the transverse plate 6, the round roller 2 and the towel 3 are lifted or lowered, and when the follow-up cold compress is ensured, the towel 3 can be in contact with the abdomen of a patient, and cold compress treatment is carried out at first.

Please refer to fig. 3 again, still fixed mounting has mounting bracket 13 in the bottom of service creeper 1, mounting bracket 13 is "L" shape setting, reciprocating drive mechanism installs including rotating cam 12 and the fixed mounting of mounting bracket 13 are in driving motor 11 on the mounting bracket 13, driving motor 11's output with the pivot axis of cam 12 is connected, cam 12 is connected with and installs the elastic sliding component in service creeper 1 bottom.

Elastic sliding assembly includes fixed mounting and is in two guide bar 8, the slip setting of creeper 1 bottom are two slide 9 and cover on the guide bar 8 are established first spring 10 in the guide bar 8 periphery, cam 12 with the lateral part butt of slide 9. The two ends of the sliding plate 9 are respectively fixed with the two vertical plates 4, one end of the first spring 10 is connected with the sliding plate 9, and the other end of the first spring is connected with the end part of the guide rod 8.

Driving motor 11 is at the during operation, with drive cam 12 rotation, then, cam 12 just can promote slide 9 and slide on two guide bar 8, this in-process, first spring 10 is compressed, and after cam 12 rotates certain angle, first spring 10 will rebound, make slide 9 slide to the normal position again on guide bar 8, it is reciprocal to circulate so, make diaphragm 6 and round roller 2 do reciprocal linear motion on the horizontal direction, correspondingly, round roller 2 rolls round and round on one section position on patient's belly, make the scope of cold compress wider, the effect is better.

Referring to fig. 4 and 5 again, the elastic mechanism includes two cross bars 14 fixedly installed on the cross plate 6 and two sliding blocks 15 symmetrically slidably installed on the two cross bars 14, and the two sliding blocks 15 are respectively connected with the combination board 20 through two support bars 16. The two ends of the support rod 16 are respectively rotatably connected with the combined plate 20 and the sliding block 15, two second springs 28 are respectively sleeved on the two cross rods 14, one end of each second spring 28 is connected with the sliding block 15, and the other end of each second spring 28 is connected with the thread compression mechanism.

It should supplement and explain that the lateral part of compoboard 20 still fixed mounting have a plurality of gag lever posts 17 perpendicular to it, just a plurality of breachs have been seted up on the both sides of diaphragm 6, gag lever post 17 pass the breach and with diaphragm 6 sliding connection, gag lever post 17 with the setting of breach plays the guide effect to the motion of compoboard 20 in vertical direction, guarantees the normal contact of towel 3 with patient's belly.

Referring to fig. 2 and 5 again, the screw compression mechanism includes a bidirectional screw 18 rotatably mounted on the transverse plate 6 and two screw plates 19 symmetrically slidably disposed on the two transverse rods 14, and the screw plates 19 are connected to an end of the second spring 28 away from the sliding block 15. The bidirectional screw rod 18 penetrates through the two thread plates 19, the two thread plates 19 are in threaded connection with the bidirectional screw rod 18, and one end of the bidirectional screw rod 18 is connected with the one-way transmission mechanism.

In detail, the thread plate 19 is provided with two through holes, two of the through holes are used for two of the cross rods 14 to pass through, the other through hole is used for the two-way screw rod 18 to pass through, and the inner wall of the through hole is provided with a thread engaged with the two-way screw rod 18.

Reciprocating drive mechanism is at the during operation, riser 4 will be at the reciprocating motion on the horizontal direction, riser 4 is when moving towards one side, one-way drive mechanism will trigger motion, and drive two-way lead screw 18 and rotate, then, two screw plates 19 just carry out screw-thread fit and the motion of being close to each other with two-way lead screw 18 simultaneously, make second spring 28 compressed, then, two sliders 15 make round roller 2 to the abdominal pressure of patient increase gradually through bracing piece 16, therefore, at the in-process of whole cold compress, round roller 2 and towel 3 are crescent to the abdominal degree of pressure of patient, realized that the cold compress in-process is progressive in proper order, the process of an adaptation is provided for the patient, prevent to produce the problem emergence of uncomfortable sense because of the too big patient's belly injury position that leads to the fact because of the cold compress dynamics at first.

Referring to fig. 6 again, the one-way transmission mechanism includes a ratchet 26 rotatably mounted on the side of the vertical plate 4 and a long strip 27 fixedly mounted on the lying plate 1, and the rotating shaft of the ratchet 26 is connected with the two-way screw rod 18 through a movable connection structure. A plurality of inclined grooves are formed in the long lath 27 along the length direction of the long lath at equal intervals, and each inclined groove is internally provided with a pawl in a rotating mode.

It is to be emphasized that the strip 27 is bolted to the lying plate 1 and, after the cold compress treatment of the patient has ended, the two-way screw 18 is reversed to restore the two threaded plates 19 for the next use. Therefore, at this time, the medical staff can detach the long strip plate 27 and then reversely rotate the bidirectional screw rod 18.

The movable connecting structure comprises a first connecting rod 21 and a second connecting rod 22, the head ends of the first connecting rod 21 and the second connecting rod are rotatably connected through a shaft element 25, the tail end of the first connecting rod 21 is rotatably connected with a rotating shaft of the ratchet 26, and the tail end of the second connecting rod 22 is rotatably connected with the bidirectional screw rod 18. The shaft member 25 is connected to the rotating shaft of the ratchet wheel 26 through a first transmission belt 23, and is also connected to the bidirectional screw 18 through a second transmission belt 24.

When the vertical plate 4 reciprocates, the ratchet 26 moves along with the vertical plate, and the long strip plate 27 is fixed on the lying plate 1, so when the ratchet 26 moves towards one side, the pawl on the ratchet 26 overturns in the process of contacting with the ratchet 26, and the ratchet 26 does not rotate, otherwise, when the ratchet 26 moves towards the other side, the pawl on the long strip plate 27 cannot overturn, so that the ratchet 26 rotates, the rotating shaft of the ratchet 26 drives the shaft 25 to rotate through the first transmission belt 23, and the shaft 25 drives the bidirectional screw rod 18 to rotate through the second transmission belt 24.

An included angle is reserved between the first connecting rod 21 and the second connecting rod 22, and in the process that the electric telescopic rod 7 drives the expansion plate 5 to slide towards the inner part of the vertical plate 4, the included angle between the first connecting rod 21 and the second connecting rod 22 is gradually reduced, and the transmission state between the ratchet wheel 26 and the bidirectional screw rod 18 is still maintained.

The working principle of the invention is as follows: when in use, a patient lies on the lying plate 1, the abdomen of the patient is placed below the round roller 2, and then the medical staff wraps the towel for cold compress on the periphery of the round roller 2;

the electric telescopic rod 7 works to drive the telescopic plate 5 to slide towards the inside or the outside of the vertical plate 4, and accordingly the horizontal plate 6, the round roller 2 and the towel 3 are lifted or lowered until the towel 3 is contacted with the abdomen of a patient;

when the driving motor 11 works, the driving cam 12 rotates, so that the cam 12 can push the sliding plate 9 to slide on the two guide rods 8, in the process, the first spring 10 is compressed, and after the cam 12 rotates for a certain angle, the first spring 10 rebounds to enable the sliding plate 9 to slide to the original position on the guide rods 8, and the reciprocating is repeated in such a circulating way, so that the transverse plate 6 and the round roller 2 do reciprocating linear motion in the horizontal direction, and correspondingly, the round roller 2 rolls back and forth on a section of part on the abdomen of a patient, so that the cold compress range is wider, and the effect is better;

when the vertical plate 4 reciprocates, the ratchet 26 moves along with the vertical plate, and the long strip plate 27 is fixed on the lying plate 1, so that when the ratchet 26 moves towards one side, a pawl on the ratchet 26 turns over in the process of contacting with the ratchet 26, and the ratchet 26 does not rotate, otherwise, when the ratchet 26 moves towards the other side, the pawl on the long strip plate 27 does not turn over, so that the ratchet 26 rotates, the rotating shaft of the ratchet 26 drives the shaft member 25 to rotate through the first transmission belt 23, and the shaft member 25 drives the bidirectional screw rod 18 to rotate through the second transmission belt 24;

two-way lead screw 18 pivoted in-process, two thread plates 19 just carry out screw-thread fit and the motion of being close to each other with two-way lead screw 18 simultaneously, make second spring 28 compressed, then, two sliders 15 make circle roller 2 to the abdominal pressure of patient increase gradually through bracing piece 16, therefore, at the in-process of whole cold compress, circle roller 2 and towel 3 are to the abdominal pressure intensity of patient's crescent, realized the cold compress in-process progressive in proper order, for the patient provides the process of an adaptation, prevent to produce the problem emergence of uncomfortable sense because of the too big patient's belly injury position of the cold compress dynamics that begins.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A cold compress physiotherapy device for abdominal trauma in emergency surgery is characterized by comprising a lying plate (1) and a transverse plate (6) which is arranged on the lying plate (1) and is parallel to the lying plate, wherein the transverse plate (6) is connected with an electric lifting mechanism arranged on the lying plate (1);

a combined plate (20) is movably arranged on the transverse plate (6) through an elastic mechanism, the combined plate (20) is U-shaped, a round roller (2) is rotatably arranged on the combined plate (20), and a towel (3) for cold compress of the abdomen of a patient is detachably connected to the periphery of the round roller (2);

the elastic mechanism is also connected with a thread compression mechanism, and the thread compression mechanism is arranged on the transverse plate (6) and is connected with the electric lifting mechanism through a one-way transmission mechanism;

the bottom of the lying plate (1) is also provided with a reciprocating driving mechanism, and the reciprocating driving mechanism is connected with the electric lifting mechanism.

2. The cold compress physiotherapy device for abdominal trauma in emergency surgery according to claim 1, characterized in that the electric lifting mechanism comprises two vertical plates (4) which are respectively and fixedly installed on two sides of the lying plate (1) and are perpendicular to the lying plate (1) and a telescopic plate (5) which is arranged in the vertical plates (4) in a sliding manner, the transverse plate (6) is fixedly installed between the two telescopic plates (5), one of the two vertical plates (4) is provided with an electric telescopic rod (7), and the movable end of the electric telescopic rod (7) is fixed with the side part of the telescopic plate (5).

3. The cold compress physiotherapy device that emergency surgery was used for belly traumatism according to claim 2, characterized in that, there is mounting bracket (13) bottom still fixed mounting of service creeper (1), mounting bracket (13) are "L" shape setting, reciprocal actuating mechanism is including rotating cam (12) and the fixed mounting of installing mounting bracket (13) drive motor (11) on mounting bracket (13), the output of drive motor (11) with the rotation axis connection of cam (12), cam (12) are connected with and install the elastic sliding component in service creeper (1) bottom.

4. The cold compress physiotherapy device for the abdominal trauma in emergency surgery according to claim 3, characterized in that the elastic sliding assembly comprises two guide rods (8) fixedly mounted at the bottom of the lying plate (1), a sliding plate (9) slidably arranged on the two guide rods (8), and a first spring (10) sleeved on the periphery of the guide rods (8), the cam (12) is abutted with the side of the sliding plate (9);

the two ends of the sliding plate (9) are respectively fixed with the two vertical plates (4), one end of the first spring (10) is connected with the sliding plate (9), and the other end of the first spring is connected with the end of the guide rod (8).

5. The cold compress physiotherapy device for abdominal trauma in emergency surgery according to claim 1, characterized in that the elastic means comprise two cross bars (14) fixedly mounted on the cross plate (6) and two sliders (15) symmetrically and slidably arranged on the two cross bars (14), the two sliders (15) are connected to the combined plate (20) through two support bars (16);

the two ends of the supporting rod (16) are respectively rotatably connected with the combined plate (20) and the sliding block (15), two second springs (28) are further sleeved on the two cross rods (14), one end of each second spring (28) is connected with the sliding block (15), and the other end of each second spring is connected with the thread compression mechanism.

6. The cold compress physiotherapy device for abdominal trauma in emergency surgery according to claim 5, characterized in that the threaded compression mechanism comprises a bidirectional screw (18) rotatably mounted on the transverse plate (6) and two threaded plates (19) symmetrically and slidably arranged on the two transverse rods (14), the threaded plates (19) being connected to the end of the second spring (28) remote from the slider (15);

the bidirectional screw rod (18) penetrates through the two thread plates (19), the two thread plates (19) are in threaded connection with the bidirectional screw rod (18), and one end of the bidirectional screw rod (18) is connected with the one-way transmission mechanism.

7. The cold compress physiotherapy device for abdominal trauma in emergency surgery according to claim 6, characterized in that the one-way transmission mechanism comprises a ratchet wheel (26) rotatably mounted on the side of the vertical plate (4) and a long strip plate (27) fixedly mounted on the lying plate (1), the rotating shaft of the ratchet wheel (26) is connected with the two-way screw rod (18) through an active connection structure;

wherein, a plurality of inclined grooves are arranged on the long lath (27) along the length direction of the long lath at equal intervals, and each inclined groove is internally provided with a pawl in a rotating way.

8. The cold compress physiotherapy device for abdominal trauma in emergency surgery according to claim 7, characterized in that the movable connection structure comprises a first connecting rod (21) and a second connecting rod (22) with head ends rotatably connected by a shaft member (25), the tail end of the first connecting rod (21) is rotatably connected with the rotating shaft of the ratchet wheel (26), and the tail end of the second connecting rod (22) is rotatably connected with the bidirectional screw rod (18);

the shaft member (25) is connected with a rotating shaft of the ratchet wheel (26) through a first transmission belt (23) and is also connected with the bidirectional screw rod (18) through a second transmission belt (24).