CN212090492U - Medical treatment is with expanding ear and applying medicine equipment - Google Patents

Abstract

The utility model relates to the field of medical equipment, in particular to medical ear expanding medicine feeding equipment, which comprises a cylinder, a handle frame, a rotary pushing mechanism, a medicine feeding mechanism and an expanding mechanism, wherein the rotary pushing mechanism comprises a threaded rod, a threaded sleeve, a pushing disc and an extrusion block, the medicine feeding mechanism comprises a funnel and a medicine feeding pipe, the medicine feeding pipe is arranged at the top of one end of the cylinder, the funnel is arranged at the top of the medicine feeding pipe, the funnel is fixedly connected with the medicine feeding pipe, the expanding mechanism comprises four groups of expanding components, the four groups of expanding components are symmetrically arranged outside the cylinder in pairs, the expanding components comprise a sleeve plate, a support rod, an expansion plate and two first reset springs, the sleeve plate and the expansion plate are all in a quarter round plate structure, the utility model discloses a medicine feeding equipment which can feed medicine to the auditory meatus of a patient by placing the expanding mechanism into the meatus opening, adding medicine from the funnel and rotating a rotary cap, simple structure, convenient and fast has improved the efficiency of adding medicine to the ear canal greatly, and the practicality is strong.

Description

Medical treatment is with expanding ear and applying medicine equipment

Technical Field

The utility model relates to the field of medical equipment, concretely relates to medical treatment is with expanding ear medicine feeding equipment.

Background

It seems easy to apply the drug to the ear, but otherwise, it causes difficulty in applying the drug to the ear canal due to the narrow ear canal, affects the therapeutic effect if the method is inappropriate, has a complicated structure in the ear, and does not directly affect the drug effect if the administration posture is not.

At present, when most of the medicines are applied to the ears, the head of a patient is inverted to one side, the sick ears are upward, and the auricle is pulled to the back upper side, so that the auditory meatus is straightened, and the medicines are applied conveniently. In the case of a powder, the powder is usually placed in a small paper tube, and the paper tube is inserted a little into the mouth of the ear canal, so that the assistant can gently blow the powder into the ear canal through the mouth.

If the ointment is used, the ointment is firstly coated and extruded on a cotton swab, then the cotton swab is lightly spread on the ear canal wall, and the action is gentle, so that the ear canal wall or the tympanic membrane is prevented from being damaged.

If the liquid medicine is used, the liquid medicine should slowly flow into the auditory canal, generally 3 to 4 drops are preferred each time, massive perfusion is forbidden, after the dripping is finished, the tragus of the ear for dripping the liquid medicine is kneaded and pressed towards the auditory canal by the forefinger, and then the opening of the auditory canal is lightly blocked by a cotton ball to prevent the liquid medicine from flowing out.

The medicine application needs to be careful every time, every detail needs to be taken care of all the time, the medicine application personnel can be tired, time is wasted, the efficiency is not high, and therefore the ear expanding medicine application equipment for medical treatment needs to be designed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a medical treatment is with expanding ear medicine feeding equipment.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a medical treatment is with expanding ear medicine feeding equipment, includes drum, handle frame, rotatory advancing mechanism, income medicine mechanism and expanding mechanism, the drum is the cylinder structure that the middle part is the fretwork form, the handle frame comprises two bar plates, and two bar plate symmetries set up in the one end bottom of drum, rotatory advancing mechanism includes threaded rod, thread bush, propelling movement disc and extrusion piece, the thread bush sets up in the inside one end of drum to thread bush and drum fixed connection, the one end of threaded rod passes the thread bush and is connected with propelling movement disc one side, propelling movement disc and extrusion piece all are located the drum inside, and the extrusion piece sets up in the opposite side of propelling movement disc, it includes funnel and medicine pipe to go into the medicine mechanism, it sets up in the one end top of drum to go into the medicine pipe, the funnel sets up in medicine pipe top, and funnel and medicine pipe fixed connection, the expansion mechanism comprises four sets of expansion assemblies, the two bisymmetry of four sets of expansion assemblies sets up in the outside of drum, and expansion assembly includes lagging, take the board, bracing piece, expansion plate and two first reset spring, lagging and expansion plate all are the circular plate structure of fourth, two first reset spring symmetries set up in the top of lagging, and two first reset spring and the equal fixed connection of lagging, take the board fixed the setting in two first reset spring tops, the bracing piece is located between take the board and the expansion plate.

Preferably, the one end of threaded rod is equipped with and revolves the cap, revolve cap and threaded rod fixed connection, be equipped with the screw hole on the threaded bush, the other end of threaded rod passes through screw hole and threaded bush threaded connection, the one end that the threaded rod is close to the threaded bush passes through bolt and propelling movement disc fixed connection.

Preferably, the extrusion block is of a mushroom-shaped structure, one side of the pushing disc is fixedly connected with the extrusion block through a bolt, a medicine inlet is formed in the top of the cylinder, and one end of the medicine inlet pipe is inserted into the cylinder through the medicine inlet.

Preferably, the funnel top is equipped with the closing cap, one side of closing cap is articulated with the funnel, and the opposite side top of closing cap is equipped with the handle, handle and closing cap fixed connection, the drum one end that is close to the expanding mechanism is equipped with out the medicine piece, it is the mushroom-shaped structure of middle part fretwork to go out the medicine piece to one side of going out the medicine piece and the one end fixed connection of drum.

Preferably, the medicine discharging block is provided with a plurality of medicine discharging holes, the cylinder is provided with four sliding rods, the four sliding rods are symmetrically arranged on the outer wall of the cylinder in pairs, and the four sliding rods are fixedly connected with the cylinder.

Preferably, the inner wall of each sleeve plate in each group of expansion assemblies is provided with a sliding groove, the four sliding rods are connected with the corresponding sleeve plates in a sliding mode through the sliding grooves, two second reset springs and four first convex blocks are arranged between every two sleeve plates, the two ends of each second reset spring are sleeved on the two corresponding first convex blocks, each first convex block is fixedly connected with the corresponding sleeve plate, and the two ends of each second reset spring are fixedly connected with the two corresponding sleeve plates.

Preferably, every loading board top all is equipped with a axle sleeve, four spinal branch vaulting poles pass through axle sleeve and correspond loading board fixed connection, the top of every spinal branch vaulting pole and the equal fixed connection of inner wall that corresponds the expansion plate.

Preferably, all be equipped with two third reset springs and four second lugs between per two expansion plates, every third reset spring's both ends cover is located on corresponding two second lugs, every second lug and the equal fixed connection of corresponding expansion plate, two expansion plates and every two third reset spring fixed connection of corresponding.

The utility model has the advantages that: before use, the device is cleaned, dried and disinfected, firstly, an expansion mechanism is slowly plugged into the ear canal opening of a patient, a cylinder drives a propelling mechanism and a medicine inlet mechanism to move forwards slightly, four sliding rods slowly penetrate through four sleeve plates through four sliding grooves, the four sleeve plates are extruded by the cylinder and matched with a second return spring to move outwards respectively to compress a first return spring, the first return spring pushes a carrying plate to expand outwards, the carrying plate drives a supporting rod to expand outwards, the supporting rod is matched with a third return spring to drive four peripheral telescopic plates to expand outwards, a medicine outlet block enters the ear canal opening after penetrating through the sleeve plates, a sealing cover is opened manually by using a handle, a medicine flows into the cylinder from a funnel, the sealing cover is closed, a hand holds a hand lifting frame by one hand, a rotary cap is rotated by one hand, the rotary cap drives a threaded rod to rotate, and the threaded rod is in threaded connection with the threaded sleeve, so the threaded rod moves towards the inside of the cylinder along the horizontal direction of the, the threaded rod drives the propelling movement disc and moves forward, and the propelling movement disc drives the extrusion piece and moves forward to the extrusion piece pushes away the medicine and moves forward, when the medicine is pushed away to the play medicine piece of drum one end inside, because the medicament receives the extrusion effect of extrusion piece and play medicine piece inner wall, thereby the medicament flows out and flows into to the inside of ear canal mouth through going out the medicine hole, the utility model discloses an put into the ear canal mouth with expanding mechanism, add the medicament and rotate from funnel department and revolve the cap and can go on the medicine to patient's ear canal, simple structure, convenient and fast has improved greatly and has gone up the medicine efficiency to the ear canal, and the practicality is strong.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments of the present invention are briefly described below.

Fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a schematic perspective view of the rotary propulsion mechanism of the present invention;

fig. 3 is a three-dimensional splitting schematic view of the medicine feeding mechanism of the utility model;

FIG. 4 is a schematic view of the expanding mechanism of the present invention;

fig. 5 is a bottom view of the expanding mechanism of the present invention;

fig. 6 is an exploded view of the rotary propulsion mechanism of the present invention;

fig. 7 is a schematic view of a three-dimensional structure of the cylinder of the present invention;

FIG. 8 is a schematic view of the three-dimensional structure of the medicine discharging block of the present invention

FIG. 9 is an enlarged view taken at A in FIG. 4;

in the figure: the medicine feeding device comprises a cylinder 1, a hand lifting frame 2, a rotary pushing mechanism 3, a medicine feeding mechanism 4, an expansion mechanism 5, a strip-shaped plate 6, a threaded rod 7, a threaded sleeve 8, a pushing disc 9, an extrusion block 10, a funnel 11, a medicine feeding pipe 12, an expansion assembly 13, a sleeve plate 14, a carrying plate 15, a support rod 16, a telescopic plate 17, a first return spring 18, a screw cap 19, a threaded hole 20, a medicine feeding port 21, a sealing cover 22, a handle 23, a medicine discharging block 24, a medicine discharging hole 25, a sliding rod 26, a sliding chute 27, a second return spring 28, a first convex block 29, a shaft sleeve 30, a third return spring 31 and a second convex block 32.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some components of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product.

Referring to fig. 1 to 6, the medical ear expanding medicine feeding device comprises a cylinder 1, a handle frame 2, a rotary pushing mechanism 3, a medicine feeding mechanism 4 and an expanding mechanism 5, wherein the cylinder 1 is a cylindrical structure with a hollowed middle part, the handle frame 2 is composed of two strip-shaped plates 6, the two strip-shaped plates 6 are symmetrically arranged at the bottom of one end of the cylinder 1, the rotary pushing mechanism 3 comprises a threaded rod 7, a threaded sleeve 8, a pushing disc 9 and an extrusion block 10, the threaded sleeve 8 is arranged at one end of the inside of the cylinder 1, the threaded sleeve 8 is fixedly connected with the cylinder 1, one end of the threaded rod 7 penetrates through the threaded sleeve 8 to be connected with one side of the pushing disc 9, the pushing disc 9 and the extrusion block 10 are both positioned inside the cylinder 1, the extrusion block 10 is arranged at the other side of the pushing disc 9, the medicine feeding mechanism 4 comprises a funnel 11 and a medicine feeding pipe 12, the medicine inlet pipe 12 is arranged at the top of one end of the cylinder 1, the funnel 11 is arranged at the top of the medicine inlet pipe 12, the funnel 11 is fixedly connected with the medicine inlet pipe 12, the expansion mechanism 5 is composed of four groups of expansion components 13, two pairs of expansion components 13 of the four groups are symmetrically arranged outside the cylinder 1, each expansion component 13 comprises a sleeve plate 14, a carrying plate 15, a support rod 16, an expansion plate 17 and two first reset springs 18, the sleeve plates 14 and the expansion plates 17 are of quarter circular plate structures, the two first reset springs 18 are symmetrically arranged at the top of the sleeve plate 14, the two first reset springs 18 and the sleeve plate 14 are fixedly connected, the carrying plate 15 is fixedly arranged at the top of the two first reset springs 18, the support rod 16 is positioned between the carrying plate 15 and the expansion plate 17, the expansion mechanism 5 is slowly plugged into an ear canal of a patient, the cylinder 1 drives the propelling mechanism and the medicine inlet mechanism 4 to move forwards gently, four sliding rods 26 slowly penetrate the cylinder 1 through four sleeve plates 14 through four sliding grooves 27, the four sleeve plates 14 are respectively pushed by the cylinder 1 to be matched with second return springs 28 to move outwards to compress first return springs 18, the first return springs 18 push the carrying plates 15 to expand outwards, the carrying plates 15 drive the supporting rods 16 to expand outwards, the supporting rods 16 are matched with third return springs 31 to drive four peripheral telescopic plates 17 to expand outwards, medicine discharging blocks 24 enter the ear canal openings after penetrating through the sleeve plates 14, the sealing covers 22 are opened by manually using the handles 23, medicine flows into the cylinder 1 from the funnels 11, the sealing covers 22 are closed, the hand-holding rack 2 is held by one hand, the screw caps 19 are rotated by one hand, the screw rods 7 drive the threaded rods 7 to rotate, the threaded rods 7 are in threaded connection with the threaded sleeves 8, the threaded rods 7 move towards the inside the cylinder 1 along the horizontal direction of the cylinder 1, the threaded rods 7 drive the pushing discs 9 to move forwards, the pushing disc 9 drives the extrusion block 10 to move forward, so that the extrusion block 10 pushes the medicine to move forward, and when the medicine is pushed to the inside of the medicine outlet block 24 at one end of the cylinder 1, the medicine flows out of the medicine outlet hole 25 and flows into the inside of the auditory canal opening due to the extrusion effect of the extrusion block 10 and the inner wall of the medicine outlet block 24.

The one end of threaded rod 7 is equipped with and revolves cap 19, revolve cap 19 and threaded rod 7 fixed connection, be equipped with screw hole 20 on the thread bush 8, threaded hole 20 and 8 threaded connection of thread bush are passed through to the other end of threaded rod 7, threaded rod 7 is close to the one end of thread bush 8 and passes through bolt and propelling movement disc 9 fixed connection, and manual rotation revolves cap 19, revolves cap 19 because of with 7 one end fixed connection of threaded rod, revolves cap 19 and drives threaded rod 7 and rotate, and threaded rod 7 is because of with 8 threaded connection of thread bush, and consequently threaded rod 7 is along with 8 middle parts of thread bush toward 1 internal translations, the other end and the propelling movement disc 9 fixed connection of threaded rod 7, and consequently threaded rod 7 drives propelling movement disc 9 and moves along, reaches the purpose of sending medicine.

Extrusion piece 10 is mushroom column structure, promote one side of disc through bolt and extrusion piece 10 fixed connection, 1 top of drum is equipped with into medicine mouth 21, the one end of going into pencil 12 is inserted through advancing medicine mouth 21 and is located drum 1 in, propelling movement disc 9 and extrusion piece 10 fixed connection to propelling movement disc 9 drives extrusion piece 10 and moves towards drum 1 interior translation, advances setting up of medicine mouth 21 and conveniently adds the medicament that has prepared to drum 1 in, cooperation extrusion piece 10 reaches the purpose of sending the medicine.

11 tops of funnel are equipped with closing cap 22, one side of closing cap 22 is articulated with funnel 11, and the opposite side top of closing cap 22 is equipped with handle 23, handle 23 and closing cap 22 fixed connection, 1 one end of drum that is close to expander 5 is equipped with out medicine piece 24, it is the mushroom-shaped structure of middle part fretwork to go out medicine piece 24 to go out one side of medicine piece 24 and the one end fixed connection of drum 1, manually utilize handle 23 to open closing cap 22, add the medicament in funnel 11, along advancing medicine mouth 21 and get into in drum 1, close closing cap 22, avoid debris to get into drum 1, when extrusion piece 10 promotes the medicament and gets into out medicine piece 24 inside, extrusion piece 10 and the laminating of play medicine piece 24 inner wall, thereby extrude the medicament, make the medicament flow out from a medicine hole 25, reach the purpose of sending the medicine.

The medicine discharging block 24 is provided with a plurality of medicine discharging holes 25, the cylinder 1 is provided with four sliding rods 26, the four sliding rods 26 are symmetrically arranged on the outer wall of the cylinder 1 in pairs, the four sliding rods 26 are fixedly connected with the cylinder 1, and the four sliding rods 26 on the cylinder 1 enter the four sleeve plates 14 through the sliding grooves 27 on the corresponding sleeve plates 14, so that the effect of stably protecting the auditory meatus is achieved.

The lagging 14 inner wall in every group expansion subassembly 13 all is equipped with a spout 27, four slide bars 26 pass through spout 27 and correspond lagging 14 sliding connection, all are equipped with two second reset spring 28 and four first lugs 29 between per two lagging 14, the both ends cover of every second reset spring 28 is located and is corresponded two first lugs 29, every first lug 29 with correspond the equal fixed connection of lagging 14 to two second reset spring 28's both ends and two correspond the equal fixed connection of lagging 14, second reset spring 28's setting is when in order to ensure that lagging 14 is firm, can also outwards expand through first reset spring 18 for the play medicine piece 24 of drum 1 one end steadily gets into in the duct, reaches the purpose of protection duct.

Every 15 tops of taking board all are equipped with a axle sleeve 30, four bracing pieces 16 through axle sleeve 30 with correspond 15 fixed connection of taking board, the top of every bracing piece 16 and the equal fixed connection of inner wall that corresponds expansion plate 17, when four lagging 14 received the outside expansion of extrusion, the first reset spring 18 of lagging 14 extrusion, first spring extrusion take board 15, take board 15 through four peripheral expansion plates 17 of backup pad extrusion, four expansion plates 17 are through four third reset spring 31 and outside expansion to guarantee the flexibility of device, protect the duct.

All be equipped with two third reset spring 31 and four second lugs 32 between per two expansion plate 17, every third reset spring 31's both ends cover is located and is corresponded two second lugs 32 on, every second lug 32 with correspond the equal fixed connection of expansion plate 17, two expansion plate 17 with correspond per two third reset spring 31 fixed connection, when four bracing pieces 16 toward expand four expansion plate 17 that the extrusion corresponds outward, because of per two adjacent expansion plate 17 all have two third reset spring 31 fixed connection, thereby four telescopic links toward expanding outward, guarantee the stationarity of equipment and protect the duct.

The working principle is as follows: firstly, slowly inserting an expansion mechanism 5 into the ear canal mouth of a patient, slightly moving a cylinder 1 with a propelling mechanism and a medicine inlet mechanism 4 forwards, slowly passing the cylinder 1 through four sleeve plates 14 by four sliding rods 26 through four sliding grooves 27, respectively moving the four sleeve plates 14 outwards by the extrusion of the cylinder 1 in cooperation with second return springs 28 to compress first return springs 18, pushing a carrying plate 15 to expand outwards by the first return springs 18, driving a supporting rod 16 to expand outwards by the carrying plate 15, further driving four peripheral telescopic plates 17 to expand outwards by the supporting rod 16 in cooperation with third return springs 31, enabling a medicine outlet block 24 to enter the ear canal mouth after passing through the sleeve plates 14, manually opening a sealing cover 22 by using a handle 23, flowing a medicine into the cylinder 1 from a funnel 11, closing the sealing cover 22, grasping a handle frame 2 by one hand, rotating a screw cap 19 by one hand, driving a screw rod 7 to rotate by the screw cap 19, and connecting the screw rod 7 with the screw sleeve 8 by threads, therefore threaded rod 7 moves towards drum 1 inside along drum 1's horizontal direction, threaded rod 7 drives propelling movement disc 9 and moves forward, and propelling movement disc 9 drives extrusion piece 10 and moves forward to extrusion piece 10 pushes away the medicine and moves forward, and when the medicine was pushed to the play medicine piece 24 inside of drum 1 one end, because the medicament received the squeezing action of extrusion piece 10 and play medicine piece 24 inner wall, thereby the medicament flowed out and flowed into the inside of duct mouth through a medicine hole 25.

Claims (8)

1. The utility model provides a medical treatment is with expanding ear medicine feeding equipment, its characterized in that, includes drum (1), handle frame (2), rotatory advancing mechanism (3), goes into medicine mechanism (4) and expanding mechanism (5), drum (1) is the cylinder structure that the middle part is fretwork form, handle frame (2) comprises two bar boards (6), and two bar boards (6) symmetry set up in the one end bottom of drum (1), rotatory advancing mechanism (3) include threaded rod (7), thread bush (8), propelling movement disc (9) and extrusion piece (10), thread bush (8) set up in the inside one end of drum (1) to thread bush (8) and drum (1) fixed connection, the one end of threaded rod (7) is passed thread bush (8) and is connected with propelling movement disc (9) one side, propelling movement disc (9) and extrusion piece (10) all are located inside drum (1), the medicine feeding mechanism (4) comprises a funnel (11) and a medicine feeding pipe (12), the medicine feeding pipe (12) is arranged at the top of one end of the cylinder (1), the funnel (11) is arranged at the top of the medicine feeding pipe (12), the funnel (11) is fixedly connected with the medicine feeding pipe (12), the expansion mechanism (5) comprises four groups of expansion assemblies (13), the four groups of expansion assemblies (13) are symmetrically arranged outside the cylinder (1), each expansion assembly (13) comprises a sleeve plate (14), a support plate (15), a support rod (16), an expansion plate (17) and two first reset springs (18), the sleeve plate (14) and the expansion plate (17) are of a quarter circular plate structure, the two first reset springs (18) are symmetrically arranged at the top of the sleeve plate (14), and the two first reset springs (18) are fixedly connected with the sleeve plate (14), the carrying plate (15) is fixedly arranged at the tops of the two first return springs (18), and the support rod (16) is positioned between the carrying plate (15) and the expansion plate (17).

2. The medical ear expanding and medicine applying device as claimed in claim 1, wherein a screw cap (19) is arranged at one end of the threaded rod (7), the screw cap (19) is fixedly connected with the threaded rod (7), a threaded hole (20) is formed in the threaded sleeve (8), the other end of the threaded rod (7) is in threaded connection with the threaded sleeve (8) through the threaded hole (20), and one end, close to the threaded sleeve (8), of the threaded rod (7) is fixedly connected with the pushing disc (9) through a bolt.

3. The medical ear expanding medicine applying device is characterized in that the extrusion block (10) is of a mushroom-shaped structure, one side of the pushing disc (9) is fixedly connected with the extrusion block (10) through a bolt, a medicine inlet (21) is formed in the top of the cylinder (1), and one end of the medicine inlet pipe (12) is inserted into the cylinder (1) through the medicine inlet (21).

4. The medical ear expanding and medicine applying device as claimed in claim 3, wherein a sealing cover (22) is arranged at the top of the funnel (11), one side of the sealing cover (22) is hinged to the funnel (11), a handle (23) is arranged at the top of the other side of the sealing cover (22), the handle (23) is fixedly connected with the sealing cover (22), a medicine discharging block (24) is arranged at one end, close to the expanding mechanism (5), of the cylinder (1), the medicine discharging block (24) is of a mushroom-shaped structure with a hollow middle part, and one side of the medicine discharging block (24) is fixedly connected with one end of the cylinder (1).

5. The medical ear expanding medicine applying device is characterized in that a plurality of medicine outlet holes (25) are formed in the medicine outlet block (24), four sliding rods (26) are arranged on the cylinder (1), the four sliding rods (26) are symmetrically arranged on the outer wall of the cylinder (1) in pairs, and the four sliding rods (26) are fixedly connected with the cylinder (1).

6. The medical ear expanding and medicine applying device according to claim 5, wherein a sliding groove (27) is formed in the inner wall of each sleeve plate (14) in each group of expansion assemblies (13), the four sliding rods (26) are slidably connected with the corresponding sleeve plate (14) through the sliding grooves (27), two second return springs (28) and four first protruding blocks (29) are arranged between every two sleeve plates (14), two ends of each second return spring (28) are sleeved on the corresponding two first protruding blocks (29), each first protruding block (29) is fixedly connected with the corresponding sleeve plate (14), and two ends of each second return spring (28) are fixedly connected with the corresponding sleeve plates (14).

7. The medical ear expanding and medicine applying device as claimed in claim 1, wherein a shaft sleeve (30) is arranged at the top of each carrying plate (15), the four support rods (16) are fixedly connected with the corresponding carrying plate (15) through the shaft sleeves (30), and the top of each support rod (16) is fixedly connected with the inner wall of the corresponding expansion plate (17).

8. The medical ear expanding and medicine applying device as claimed in claim 1, wherein two third return springs (31) and four second projections (32) are arranged between every two expansion plates (17), two ends of each third return spring (31) are sleeved on the corresponding two second projections (32), each second projection (32) is fixedly connected with the corresponding expansion plate (17), and the two expansion plates (17) are fixedly connected with every two third return springs (31).

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