CN218870672U - Multifunctional first-aid cart combination device - Google Patents

Abstract

The utility model discloses a multi-functional first aid shallow composite set relates to medical auxiliary assembly technical field, and its technical scheme main points are: comprises a frame platform and a stretcher device detachably connected with the frame platform; the stretcher device comprises a stretcher structure and folding storage baskets arranged at two ends of the stretcher structure; wherein, when two stretcher bars in the stretcher structure are parallelly folded, the folding storage basket is folded. The utility model can not only combine the stretcher device with the frame platform to form a first-aid cart, but also can make the stretcher device be used alone; and set up folding basket of accomodating at the both ends of stretcher structure for the stretcher device has the function of placing the relevant medical equipment of first aid when making alone, and folding basket of accomodating can be folding along with the incorporation of stretcher pole when carrying simultaneously, and whole occupation space is little, convenient to carry.

Description

Multifunctional first-aid cart combination device

Technical Field

The utility model relates to a medical auxiliary assembly technical field, more specifically say, it relates to a multi-functional first aid shallow composite set.

Background

The first aid cart is a medical instrument suitable for routine and emergency critical patient examination, X-ray diagnosis and early treatment, and is also suitable for transferring patients between departments, wards, operating rooms and ambulances.

At present, most emergency trolleys are integrated trolleys, medical equipment for emergency treatment is placed in a space below the emergency trolley, so that medical personnel cannot operate the medical equipment quickly and conveniently, and display information of the medical equipment is difficult to view; in addition, the integrated cart is difficult to be used in narrow space and uneven areas, and the application range is limited. The stretcher device and the frame platform are combined for use, the stretcher device can be detached for independent use under a complex environment, however, the detached stretcher device cannot carry medical equipment and can only be carried by medical staff, and the operation difficulty in the transfer process of a patient is large.

Therefore, how to design a multifunctional emergency cart combination device capable of overcoming the above defects is a problem which is urgently needed to be solved at present.

SUMMERY OF THE UTILITY MODEL

For solving not enough among the prior art, the utility model aims at providing a multi-functional first aid shallow composite set both can form the first aid shallow with stretcher device and frame platform combination, can make stretcher device can the exclusive use again for have the function of placing the relevant medical equipment of first aid when stretcher device makes alone, whole occupation space is little, convenient to carry.

The above technical purpose of the present invention can be achieved by the following technical solutions: a multifunctional first-aid cart combination device comprises a frame platform and a stretcher device detachably connected with the frame platform;

the stretcher device comprises a stretcher structure and folding storage baskets arranged at two ends of the stretcher structure;

wherein, when two stretcher bars in the stretcher structure are parallelly folded, the folding storage basket is folded.

By adopting the technical scheme, the stretcher device is detachably connected with the frame platform, so that the stretcher device and the frame platform can be combined to form the emergency trolley, and the stretcher device can be used independently; and set up at the both ends of stretcher structure and fold and accomodate the basket for the stretcher device has the function of placing the relevant medical equipment of first aid when making alone, and the folding basket of accomodating when carrying of stretcher device simultaneously can be folding along with the incorporation of stretcher pole, and whole occupation space is little, convenient to carry.

The utility model discloses further set up to: the folding storage basket comprises a mounting sleeve, a folding bottom plate and a cross movable frame;

the mounting sleeves are sleeved with the stretcher bars in a one-to-one corresponding manner;

the folding bottom plate is connected with the mounting sleeve through two crossed movable frames which are arranged at intervals along the axis direction of the stretcher rod;

all be equipped with the elastic cord of interval distribution between two alternately adjustable shelf between installation sleeve and the folding bottom plate, the elastic cord is in tensile state when folding the basket of accomodating is drawn in.

By adopting the technical scheme, the elastic rope is in a stretching state when the folding storage basket is folded, so that a certain elastic effect is realized on the unfolding of the stretcher rod, and the stretcher device is quick and convenient to unfold and use; in addition, the folding basket of accomodating after the expansion can regard as stretcher device's supporting seat for stretcher device's transportation convenient operation can park fast when emergency, can form the first aid platform that highly is little relatively, does benefit to medical staff first aid operation.

The utility model discloses further set up to: the folding bottom plate comprises two side plates and a plurality of rotating plates positioned between the two side plates;

the adjacent rotating plates are movably connected through hinge rods;

two ends of each rotating plate are provided with rotating shafts which can rotate relatively, so that the rotating plates can be overlapped, folded or unfolded in the horizontal direction to form a flat plate;

the adjacent rotating shafts are movably connected through two rotating rods, the two rotating rods and the rotating shafts are movably connected through first shaft rods, and the axial direction of the first shaft rods is vertical to that of the rotating shafts, so that the adjacent rotating shafts are folded or unfolded along the horizontal direction;

an elastic protective sleeve is packaged between the end parts of the rotating shafts on the same side.

Through adopting above-mentioned technical scheme, when whole folding bottom plate folds, the rotor plate is rotatory for corresponding axis of rotation, folds the coincidence gradually under the restriction that a plurality of dwangs were arranged in same horizontal plane between the adjacent rotor plate simultaneously, and can guarantee after a plurality of dwangs and a plurality of rotor plates expand that folding bottom plate is dull and stereotyped, and has certain stability.

The utility model discloses further set up to: the end part of the crossed movable frame is movably connected with the mounting sleeve and the side plate through rotating seats;

the rotating seat is provided with a third shaft lever and a second shaft lever;

the axial direction of the second shaft lever is parallel to the axial direction of the stretcher bar, so that the crossed movable frame is folded or unfolded;

the axial directions of the third shaft levers are all vertical to the axial direction of the stretcher bar, and the axial directions of all the third shaft levers are all parallel to each other, so that the folded folding bottom plate can rotate to be close to the stretcher bar.

Through adopting above-mentioned technical scheme, fold the back along with the alternately adjustable shelf is folding at folding bottom plate, can be close to the stretcher pole with folding bottom plate rotation after folding, further reduced the folding basket of accomodating, it is more convenient to carry.

The utility model discloses further set up to: the third axostylus axostyle all overlaps and is equipped with the torsional spring, and the torsional spring has the elasticity restoring force that drives folding bottom plate after folding and rotate to be close to the stretcher pole when folding bottom plate is folding.

Through adopting above-mentioned technical scheme, the folding elasticity of torsional spring can be overcome to accomodate the gravity action of placing medical equipment that the basket was drawn in the back, and medical equipment takes off the back, and the elasticity of torsional spring can overcome or offset the partial gravity that the basket was accomodate in partial folding for folding bottom plate is rotatory to be close to stretcher pole easy and simple to handle.

The utility model discloses further set up to: the stretcher bar is sleeved with a connecting sleeve, and the connecting sleeve is provided with a vertically arranged infusion support.

By adopting the technical scheme, the connecting sleeve can move along the axis direction of the stretcher rod, the position of the infusion support can be flexibly adjusted, and the infusion environment can be adjusted according to the needs of a patient.

The utility model discloses further set up to: the body of rod of infusion support is multisection telescopic link.

By adopting the technical scheme, the height of the transfusion tool can be flexibly adjusted by the multi-section telescopic rods, and the stretcher device is convenient to carry.

The utility model discloses further set up to: the infusion support is movably connected with the connecting sleeve through the steering shaft sleeve and is fastened through the fixing bolt, so that the infusion support can rotate to be parallel to the stretcher bar.

By adopting the technical scheme, the transfusion bracket rotates to be parallel to the stretcher rod, so that the stretcher device is convenient to carry.

The utility model discloses further set up to: the upper surface of the frame platform is provided with at least two groups of clamping components, and each group of clamping components is provided with two U-shaped clamping seats for clamping the stretcher bars in a one-to-one corresponding manner;

and the side surfaces of the frame platform are provided with notch areas.

Through adopting above-mentioned technical scheme, stretcher pole and U type cassette joint have, can effectively restrict stretcher device lateral sliding, and the breach district makes things convenient for medical staff or family members to lift up or exert thrust through holding stretcher pole when constituting the emergency tender from the side.

The utility model discloses further set up to: the stretcher bar consists of a main bar and an end bar which are hinged with each other, and the folding storage basket is arranged on the end bar;

the end rod is hinged with a second screw rod, the main rod is hinged with a first screw rod, and free ends of the first screw rod and the second screw rod are connected through thread sleeves;

the thread directions of the first screw rod and the second screw rod are opposite, so that when the threaded sleeve is rotated, the first screw rod and the second screw rod simultaneously move towards or away from each other along the axial direction of the threaded sleeve.

Through adopting above-mentioned technical scheme, rotating the thread bush, first screw rod, second screw rod draw in along the axis direction of thread bush simultaneously for the end rod upwards inclines for the mobile jib, and the folding internal medical equipment show surface of basket of accomodating can be for the real-time, the audio-visual information of looking over of opposite side medical staff.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model provides a multifunctional first-aid cart combination device, a stretcher device is detachably connected with a frame platform, the stretcher device and the frame platform can be combined to form a first-aid cart, and the stretcher device can be used independently; the folding storage baskets are arranged at the two ends of the stretcher structure, so that the stretcher device has the function of placing relevant medical equipment for first aid when being used independently, and can be folded along with the combination of the stretcher rods when being carried, so that the whole occupied space is small, and the carrying is convenient;

2. the elastic rope in the utility model is in a stretching state when the folding storage basket is folded, so as to have a certain elastic effect on the unfolding of the stretcher rod, thus the stretcher device is fast and convenient to unfold and use; in addition, the unfolded folding storage basket can be used as a supporting seat of the stretcher device, so that the stretcher device is convenient to transport and operate, can be quickly parked in emergency, can form an emergency platform with a relatively low height, and is beneficial to emergency operation of medical staff;

3. the utility model can rotate the folded folding bottom plate to be close to the stretcher bar after the folding bottom plate is folded along with the folding of the cross movable frame, thereby further reducing the folding storage basket and being more convenient to carry;

4. the utility model discloses rotate the thread bush, first screw rod, second screw rod draw in along the axis direction of thread bush simultaneously for the end rod upwards for the mobile jib slope, the folding internal medical equipment show surface of basket of accomodating can be for opposite side medical staff real-time, audio-visual guardianship information of looking over.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic view of an overall structure of a viewing angle in an embodiment of the present invention;

fig. 2 is a schematic overall structure diagram of another view angle in the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a folding bottom plate in the embodiment of the present invention;

fig. 4 is a schematic view of the folding of the rotating plate according to the embodiment of the present invention;

FIG. 5 is an enlarged schematic view at A in FIG. 1;

FIG. 6 is a schematic structural view of a frame platform according to an embodiment of the present invention;

fig. 7 is a schematic view of a connection structure of the end rod and the main rod in the embodiment of the present invention.

Reference numbers and corresponding part names in the figures:

101. a stretcher bar; 102. a connecting sleeve; 103. a transfusion bracket; 104. a steering shaft sleeve; 105. a frame platform; 106. a U-shaped card seat; 107. a gap region; 201. a folding storage basket; 202. installing a sleeve; 203. a cross movable frame; 204. folding the base plate; 205. an elastic cord; 206. a second shaft lever; 207. a third shaft lever; 301. a side plate; 302. a protective sleeve; 303. a rotating plate; 304. a hinged lever; 305. a rotating shaft; 306. rotating the rod; 307. a first shaft lever; 401. an end bar; 402. a main rod; 403. a first screw; 404. a threaded sleeve; 405. a second screw.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the following examples and accompanying fig. 1-6, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended to limit the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The embodiment is as follows: a multi-functional emergency cart assembly, as shown in fig. 1, includes a frame platform 105 and a stretcher device detachably connected to the frame platform 105. The stretcher device includes a stretcher structure and folding storage baskets 201 provided at both ends of the stretcher structure. When the two stretcher bars 101 in the stretcher structure are folded in parallel, the folding storage basket 201 is folded. The stretcher device can be combined with the frame platform 105 to form the emergency trolley, and can also be used independently; and set up folding basket 201 of accomodating at the both ends of stretcher structure for the stretcher device has the function of placing the relevant medical equipment of first aid when making alone, and folding basket 201 of accomodating can be folded along with the incorporation of stretcher pole 101 when carrying simultaneously, and whole occupation space is little, convenient to carry.

As shown in fig. 1 and 2, the folding storage basket 201 includes a mounting sleeve 202, a folding bottom plate 204 and a cross movable frame 203; the mounting sleeves 202 are sleeved with the stretcher bars 101 in a one-to-one correspondence manner; the folding bottom plate 204 is connected with the mounting sleeve 202 through two crossed movable frames 203 arranged at intervals along the axial direction of the stretcher bar 101; elastic ropes 205 distributed between the two crossed movable frames 203 at intervals are arranged between the mounting sleeve 202 and the folding bottom plate 204, and the elastic ropes 205 are in a stretching state when the folding storage basket 201 is folded. The elastic rope 205 is in a stretching state when the folding storage basket 201 is folded, so as to have a certain elastic action on the unfolding of the stretcher bar 101, and the stretcher device is quick and convenient to unfold and use; in addition, the folding basket 201 of accomodating after the expansion can regard as the supporting seat of stretcher device for the transportation convenient operation of stretcher device can park fast when emergency, can form the first aid platform that highly is low a bit relatively, does benefit to medical staff first aid operation.

As shown in fig. 2-4, the folding bottom panel 204 includes two side panels 301 and a plurality of rotating panels 303 positioned between the two side panels 301; the adjacent rotating plates 303 are movably connected through hinge rods 304; two ends of each rotating plate 303 are provided with rotating shafts 305 which can rotate relatively, so that the rotating plates 303 are overlapped and folded or unfolded in the horizontal direction to form a flat plate; the adjacent rotating shafts 305 are movably connected through two rotating rods 306, the two rotating rods 306 and the rotating shafts 305 are movably connected through first shaft rods 307, and the axial direction of the first shaft rods 307 is perpendicular to the axial direction of the rotating shafts 305, so that the elastic protective sleeves 302 are enclosed between the ends of the rotating shafts 305 on the same side when the adjacent rotating shafts 305 are folded or unfolded along the horizontal direction. When the whole folding bottom plate 204 is folded, the rotating plates 303 rotate relative to the corresponding rotating shafts 305, meanwhile, adjacent rotating plates 303 are gradually folded and overlapped under the limitation that the rotating rods 306 are arranged in the same horizontal plane, and after the rotating rods 306 and the rotating plates 303 are unfolded, the folding bottom plate 204 can be guaranteed to be flat and has certain stability.

As shown in fig. 2 and 5, the end of the cross movable frame 203 is movably connected with the mounting sleeve 202 and the side plate 301 through the rotating base; the rotary base is provided with a third shaft 207 and a second shaft 206; the axial direction of the second shaft 206 is parallel to the axial direction of the stretcher bar 101 so that the cross mobile 203 is folded or unfolded; the axial directions of the third shafts 207 are all perpendicular to the axial direction of the stretcher bar 101, and the axial directions of all the third shafts 207 are all parallel to each other, so that the folded folding bottom plate 204 can rotate to be close to the stretcher bar 101. After the folding bottom plate 204 is folded along with the folding of the cross sliding frame 203, the folded folding bottom plate 204 can be rotated to be close to the stretcher bar 101, so that the folding storage basket 201 is further reduced, and the carrying is more convenient.

In this embodiment, the third shaft 207 is sleeved with a torsion spring, and the torsion spring has an elastic restoring force for driving the folded folding bottom plate 204 to rotate close to the stretcher bar 101 when the folding bottom plate 204 is folded. The gravity action of the medical equipment placed after the folding storage basket 201 is folded can overcome the elasticity of the torsion spring, and after the medical equipment is taken down, the elasticity of the torsion spring can overcome or offset partial gravity of the folding storage basket 201, so that the folding bottom plate 204 rotates to be close to the stretcher bar 101, and the operation is simple and convenient.

As shown in fig. 1 and 2, a connecting sleeve 102 is fitted over the stretcher bar 101, and the connecting sleeve 102 is provided with a vertically disposed infusion support 103.

The connecting sleeve 102 can move along the axial direction of the stretcher bar 101, the position of the transfusion bracket 103 can be flexibly adjusted, and the transfusion environment can be adjusted according to the requirement of a patient.

In this embodiment, the rod body of the infusion support 103 is a multi-section telescopic rod. The multi-section telescopic rod can flexibly adjust the height of the transfusion tool, and the stretcher device is convenient to carry.

As shown in fig. 1, the infusion support 103 is movably connected to the connection sleeve 102 by a steering boss 104 and is fastened by a fixing bolt so that the infusion support 103 can be rotated to be parallel to the stretcher bar 101. After the transfusion bracket 103 rotates to be parallel to the stretcher bar 101, the stretcher device is convenient to carry.

As shown in fig. 6, at least two sets of clamping components are disposed on the upper surface of the frame platform 105, and each set of clamping components is configured with two U-shaped clamping seats 106 for clamping the stretcher bars 101 one by one. The stretcher bar 101 is clamped with the U-shaped clamping seat 106, so that the lateral sliding of the stretcher device can be effectively limited.

In this embodiment, the sides of the frame platform 105 are each provided with a notched area 107. It is convenient for medical staff or family members to exert thrust through the holding stretcher bar 101 when lifting from the side or forming the emergency cart.

As shown in fig. 7, the stretcher bar 101 is composed of a main bar 402 and an end bar 401 hinged to each other, and the folding storage basket 201 is mounted on the end bar 401; the end rod 401 is hinged with a second screw 405, the main rod 402 is hinged with a first screw 403, and the free ends of the first screw 403 and the second screw 405 are connected through a thread sleeve 404; the first and second screws 403, 405 have opposite screw threads, so that when the threaded sleeve 404 is rotated, the first and second screws 403, 405 move toward or away from each other along the axial direction of the threaded sleeve 404.

When the threaded sleeve 404 is rotated, the first screw 403 and the second screw 405 are simultaneously folded along the axial direction of the threaded sleeve 404, so that the end rod 401 is inclined upwards relative to the main rod 402, and the medical equipment display surface in the folding storage basket 201 can visually check information in real time relative to the medical staff on the other side.

The working principle is as follows: the stretcher device in the utility model is detachably connected with the frame platform 105, which not only can combine the stretcher device with the frame platform 105 to form an emergency cart, but also can enable the stretcher device to be used independently; and set up folding basket 201 of accomodating at the both ends of stretcher structure for the stretcher device has the function of placing the relevant medical equipment of first aid when making alone, and folding basket 201 of accomodating can be folded along with the incorporation of stretcher pole 101 when carrying simultaneously, and whole occupation space is little, convenient to carry.

In addition, the elastic rope 205 is in a stretching state when the folding storage basket 201 is folded, so as to have a certain elastic effect on the unfolding of the stretcher bar 101, so that the stretcher device is fast and convenient to unfold and use; in addition, the folding basket 201 of accomodating after the expansion can regard as the supporting seat of stretcher device for the transportation convenient operation of stretcher device can park fast when emergency, can form the first aid platform that highly is low a bit relatively, does benefit to medical staff first aid operation.

Additionally, the utility model discloses folding bottom plate 204 folds the back along with alternately adjustable shelf 203 is folding, can be close to stretcher pole 101 with folding bottom plate 204 rotation after folding, further reduced the folding basket 201 of accomodating, it is more convenient to carry.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A multifunctional first-aid cart combination device is characterized by comprising a frame platform (105) and a stretcher device detachably connected with the frame platform (105);

the stretcher device comprises a stretcher structure and folding containing baskets (201) arranged at two ends of the stretcher structure;

when two stretcher bars (101) in the stretcher structure are folded in parallel, the folding storage basket (201) is folded.

2. The combination of a multi-functional emergency cart of claim 1, wherein said collapsible basket (201) comprises a mounting sleeve (202), a collapsible floor (204), and a cross-frame (203);

the mounting sleeves (202) are correspondingly sleeved with the stretcher bars (101) one by one;

the folding bottom plate (204) is connected with the mounting sleeve (202) through two crossed movable frames (203) arranged at intervals along the axial direction of the stretcher bar (101);

elastic ropes (205) which are distributed between the two crossed movable frames (203) at intervals are arranged between the mounting sleeve (202) and the folding bottom plate (204), and the elastic ropes (205) are in a stretching state when the folding storage basket (201) is folded.

3. The multi-function crash cart assembly of claim 2, wherein said folding bottom panel (204) comprises two side panels (301) and a plurality of rotating panels (303) positioned between said two side panels (301);

the adjacent rotating plates (303) are movably connected through hinge rods (304);

two ends of each rotating plate (303) are respectively provided with a rotating shaft (305) capable of rotating relatively, so that the rotating plates (303) are overlapped, folded or unfolded in the horizontal direction to form a flat plate;

the adjacent rotating shafts (305) are movably connected through two rotating rods (306), the two rotating rods (306) and the rotating shafts (305) are movably connected through first shaft rods (307), and the axial direction of the first shaft rods (307) is vertical to the axial direction of the rotating shafts (305), so that the adjacent rotating shafts (305) are folded or unfolded along the horizontal direction;

an elastic protective sleeve (302) is packaged between the ends of the rotating shaft (305) on the same side.

4. The multifunctional first-aid cart combination device of claim 3, wherein the end of the cross movable frame (203) is movably connected with the mounting sleeve (202) and the side plate (301) through a rotating seat;

the rotating seat is provided with a third shaft rod (207) and a second shaft rod (206);

the axial direction of the second shaft lever (206) is parallel to the axial direction of the stretcher bar (101) so as to enable the crossed movable frame (203) to be folded or unfolded;

the axial directions of the third shafts (207) are all vertical to the axial direction of the stretcher bar (101), and the axial directions of all the third shafts (207) are all parallel to each other, so that the folded folding bottom plate (204) can rotate to be close to the stretcher bar (101).

5. The combination of claim 4, wherein the third shaft (207) is sleeved with a torsion spring, and the torsion spring has an elastic restoring force for driving the folded bottom plate (204) to rotate close to the stretcher bar (101) when the folded bottom plate (204) is folded.

6. The multifunctional emergency cart combination device as claimed in claim 1, wherein the stretcher bar (101) is sleeved with a connecting sleeve (102), and the connecting sleeve (102) is provided with a vertically arranged infusion support (103).

7. The combination of multifunctional emergency cart as claimed in claim 6, wherein the rod body of said infusion support (103) is a multi-section telescopic rod.

8. The combination of a multi-functional emergency cart according to claim 7, wherein said infusion support (103) is movably connected to the connection sleeve (102) by a steering boss (104) and fastened by a fixing bolt so that the infusion support (103) can be rotated to be parallel to the stretcher bar (101).

9. The combination device of claim 8, wherein the upper surface of the frame platform (105) is provided with at least two sets of clamping components, each set of clamping components is provided with two U-shaped clamping seats (106) for clamping the stretcher bars (101) in a one-to-one correspondence manner;

the side of the frame platform (105) is provided with a gap area (107).

10. The combination of a multifunctional emergency cart according to claim 1, wherein said stretcher bar (101) is composed of a main bar (402) and an end bar (401) hinged to each other, the folding storage basket (201) is mounted on the end bar (401);

the end rod (401) is hinged with a second screw (405), the main rod (402) is hinged with a first screw (403), and the free ends of the first screw (403) and the second screw (405) are connected through a threaded sleeve (404);

the thread directions of the first screw (403) and the second screw (405) are opposite, so that when the threaded sleeve (404) is rotated, the first screw (403) and the second screw (405) simultaneously move towards or away from each other along the axial direction of the threaded sleeve (404).

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