CN112971761A

CN112971761A - Auxiliary fixing frame for head and neck of patient for medical nuclear magnetic resonance examination

Info

Publication number: CN112971761A
Application number: CN202110360391.8A
Authority: CN
Inventors: 臧守红; 亓力; 张建俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2021-06-18

Abstract

The invention discloses a head and neck auxiliary fixing frame for a patient for medical nuclear magnetic resonance examination, which relates to the technical field of medical instruments and comprises a hollow pillow plate, wherein the middle part of the right side wall of the hollow pillow plate is fixedly connected with a sliding sleeve through a first bearing, a sliding rod is connected in the sliding sleeve in a sliding manner, and the upper part of the right side wall of the hollow pillow plate is fixedly connected with the right end optical axis part of a first threaded rod through a second bearing. Through the threaded rod one that sets up, threaded rod two, bevel gear one, thread bush two, weave the strap, mutually support between gear one and the bevel gear two, can be through rotating threaded rod one and threaded rod two respectively, make thread bush one and thread bush two remove, thereby it is fixed to carry out the centre gripping to the upside and the left and right sides of patient's head, and through taking the lower jaw position at the patient with weaving the strap, fixed to the lower jaw of patient, realized fixing the upper and lower side of patient's head, thereby the stability of patient head when carrying out nuclear magnetic resonance has been improved.

Description

Auxiliary fixing frame for head and neck of patient for medical nuclear magnetic resonance examination

Technical Field

The invention relates to the technical field of medical instruments, in particular to a patient head and neck auxiliary fixing frame for medical nuclear magnetic resonance examination.

Background

The nuclear magnetic resonance is a physical process that magnetic moment is not zero, Zeeman splitting occurs at a spinning energy level under the action of an external magnetic field, radio frequency radiation with a certain frequency is absorbed by resonance, the nuclear magnetic resonance spectroscopy is a branch of spectroscopy, the resonance frequency is in a radio frequency wave band, corresponding transition is the transition of nuclear spinning on the Zeeman energy level, the position and the type of the nuclear of the object can be obtained by detecting emitted electromagnetic waves through an external gradient magnetic field, and accordingly, a structural image inside the object can be drawn.

Present nuclear magnetic resonance head fixing device is mostly simple fixes the head both sides, and the people can appear the head very probably and carry out the luffing motion under extremely uncomfortable condition to lead to the condition of pseudo-imaging to appear, influence the diagnosis result, the most simple structure of present head fixing device moreover can only fix the patient of specific head size, when the head is not of uniform size, often need change fixing device, and is very inconvenient.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a head and neck auxiliary fixing frame for a patient for medical nuclear magnetic resonance examination, which solves the problem that the head of the patient is likely to swing back and forth under the extremely uncomfortable condition, so that the false imaging condition is caused, and the diagnosis result is influenced.

(II) technical scheme

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: the utility model provides a medical treatment nuclear magnetic resonance examination is with supplementary mount of patient's neck portion, includes hollow pillow board, bearing one fixedly connected with sliding sleeve is passed through at the right side wall middle part of hollow pillow board, sliding connection has the slide bar in the sliding sleeve, the right side wall top of hollow pillow board is through the right-hand member optical axis part fixed connection of bearing two and threaded rod one, the lateral wall middle part all is through the both ends optical axis part fixed connection of bearing two difference threaded rod two around the hollow pillow board, the middle part optical axis part fixedly connected with bevel gear one of threaded rod two.

Preferably, a spongy cushion is arranged on the upper surface of the hollow pillow plate, a concave pillow is fixedly connected to the left side of the upper surface of the spongy cushion, fixing ear plates are fixedly connected to the left side and the right side of the front side wall and the rear side wall of the hollow pillow plate, and a through groove is formed in the right side of the upper surface of the hollow pillow plate.

Preferably, the front side of the sliding rod is fixedly connected with a sliding strip, the right end of the sliding strip extends to the right side of the hollow pillow plate and is fixedly connected with a rotating plate, the sliding strip is connected in a sliding groove formed in the circumferential surface of the inner side of the sliding sleeve in a sliding mode, the left side of the sliding rod is fixedly connected with a first gear, the left end of the sliding rod is fixedly connected with a second bevel gear, and the second bevel gear is matched with the first bevel gear.

Preferably, threaded connection has thread bush one on the threaded rod one, the left end fixedly connected with gear two of threaded rod one, and gear two and gear one meshing, the last fixed surface of thread bush one is connected with L shape pole, logical groove and arc first fixed connection are passed to the upper end of L shape pole.

Preferably, the screw thread of the front side and the back side of the second threaded rod are reversely arranged, the front side and the back side of the second threaded rod are respectively in threaded connection with a second threaded sleeve, two the upper surface of the second threaded sleeve is fixedly connected with a U-shaped rod, two the U-shaped rods are respectively in sliding holes formed in the front side wall and the back side wall of the hollow pillow plate in a sliding mode, the U-shaped rods and the sliding holes are arranged in a square mode, two the upper ends of the U-shaped rods are fixedly connected with a second arc-shaped plate, and cushions are arranged on the opposite faces of the two arc-shaped plates and the left side wall of the first arc-.

Preferably, the front side preceding lateral wall left side fixed connection of arc two has a hollow box, the upper and lower lateral wall middle part fixedly connected with fixed axle of hollow box, the last downside of fixed axle all through the bearing three respectively with hollow section of thick bamboo upper and lower lateral wall fixed connection, the fixed axle overcoat is equipped with the torsional spring, and the torsional spring setting is inside hollow section of thick bamboo, and the both ends of torsional spring respectively with hollow section of thick bamboo and fixed axle fixed connection, with the one end fixed connection who weaves the strap on hollow section of thick bamboo's the periphery, and weave the strap rolling on hollow section of thick bamboo's periphery, and the opening that weaves the strap's the other end and set up on through hollow box extends to hollow box outside fixedly connected with gag lever post.

Preferably, the rear side the square ring plate of rear side wall left side fixedly connected with of arc two, the slide bar hole has been seted up at the rear side wall middle part of square ring plate, sliding connection has the slide bar in the slide bar hole, the front end of slide bar extends to the inside fixedly connected with grip block of square ring plate, the slide bar overcoat is equipped with the spring, and the both ends of spring respectively with grip block and square ring plate fixed connection, the equal fixedly connected with T shape spout in upper and lower side inner wall middle part of square ring plate, two equal sliding connection has T shape slider in the T shape spout, and two T shape sliders are fixed connection respectively at the last downside of grip block, all be provided with a plurality of pawl on the opposite face of grip block and square ring plate front side inner wall, and the most advanced of a plurality of pawl all inclines to the right side.

(III) advantageous effects

The invention has the beneficial effects that:

1. this supplementary mount of patient's neck portion for medical treatment nuclear magnetic resonance examination, threaded rod one through setting up, threaded rod two, bevel gear one, thread bush two, braid area, mutually support between gear one and the bevel gear two, can be through rotating threaded rod one and threaded rod two respectively, make thread bush one and thread bush two remove, thereby it is fixed to carry out the centre gripping to the upside and the left and right sides of patient's head, and take at patient's lower jaw position through the area of will weaving, to the fixed of patient's lower jaw, the upper and lower side to patient's head has been realized fixing, thereby the stability of patient's head when carrying out nuclear magnetic resonance has been improved.

2. This medical treatment nuclear magnetic resonance examination is with supplementary mount of patient's neck portion, through threaded rod one, threaded rod two, thread bush one, thread bush two that set up and weave mutually supporting between the area, can drive thread bush one and thread bush two respectively and carry out slow moving through rotating rotation threaded rod one and threaded rod two respectively to fix to the patient of different head diameters size, improved the practicality.

Drawings

FIG. 1 is a schematic front sectional view of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a schematic left-side view partial sectional structure of the hollow sleeper slab of the present invention;

FIG. 4 is a schematic structural view of a hollow box in front view;

FIG. 5 is a schematic left sectional view of the hollow ring plate according to the present invention;

FIG. 6 is a right side view of the sliding sleeve of the present invention.

In the figure: the device comprises a hollow pillow plate 1, a sliding sleeve 2, a sliding rod 3, a first threaded rod 4, a second threaded rod 5, a first bevel gear 6, a concave pillow 7, a sliding strip 8, a sliding groove 9, a first gear 10, a second bevel gear 11, a first thread sleeve 12, a second gear 13, a through groove 14, a first rod 15L, a first arc plate 16, a second thread sleeve 17, a U-shaped rod 18, a sliding hole 19, a second arc plate 20, a hollow box 21, a fixed shaft 22, a hollow cylinder 23, a torsion spring 24, a woven cloth belt 25, a square ring plate 26, a sliding rod hole 27, a sliding rod 28, a clamping plate 29, a spring 30, a T-shaped sliding groove 31, a T-shaped sliding block 32, inverted teeth 33, a sponge cushion 34 and a fixed lug plate 35.

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.

As shown in fig. 1 to 6, the present invention provides a technical solution: the utility model provides a medical treatment nuclear magnetic resonance examination is with supplementary mount of patient's neck portion, including hollow pillow board 1, bearing a fixedly connected with sliding sleeve 2 is passed through at the right side wall middle part of hollow pillow board 1, sliding connection has slide bar 3 in the sliding sleeve 2, through setting up sliding sleeve 2 and slide bar 3, can make slide bar 3 drive sliding sleeve 2 and carry out the pivoted while, can remove about again, thereby realize that slide bar 3 drives threaded rod one 4 and threaded rod two 5 respectively through the removal and rotate, the right-hand member optical axis part fixed connection of bearing two and threaded rod one 4 is passed through to the right side wall top of hollow pillow board 1, the both ends optical axis part fixed connection of threaded rod two 5 is all distinguished through bearing two in the front and back lateral wall middle part of hollow pillow board 1, the middle part optical axis part fixed connection of threaded rod.

The upper surface of hollow pillow board 1 is provided with foam-rubber cushion 34, through setting up foam-rubber cushion 34, can make the patient when lying on the back on hollow pillow board 1, the occipital bone contacts with foam-rubber cushion 34, patient's travelling comfort is improved, the upper surface left side fixedly connected with spill pillow 7 of foam-rubber cushion 34, through setting up spill pillow 7, can make the patient when lying on the back on the sick bed, the neck just in time is in the depressed part, thereby avoid patient's head to appear rocking, the equal fixedly connected with fixed otic placode 35 on the left and right sides of lateral wall around hollow pillow board 1, through setting up fixed otic placode 35, can make things convenient for this mount and sick bed body to dock the installation, logical groove 14 has been seted up on the upper surface right side of hollow pillow board 1, through seting up logical groove 14, be convenient for make 12.

The front side of the sliding rod 3 is fixedly connected with a sliding strip 8, the right end of the sliding strip 8 extends to the right side of the hollow pillow plate 1 and is fixedly connected with a rotating plate, the sliding rod 3 can be more conveniently rotated by arranging the rotating plate, the sliding strip 8 is slidably connected in a sliding groove 9 formed in the circumferential surface of the inner side of the sliding sleeve 2, the sliding strip 3 can drive the sliding sleeve 2 to rotate through the limit of the sliding groove 9 by arranging the sliding strip 8 and the sliding groove 9, meanwhile, the sliding rod 3 can move in the sliding sleeve 2, the sliding rod 3 can conveniently drive a first threaded rod 4 and a second threaded rod 5 to rotate respectively, the structural integrity is realized, the left side of the sliding rod 3 is fixedly connected with a first gear 10, the left end of the sliding rod 3 is fixedly connected with a second bevel gear 11, the second bevel gear 11 is matched with a first bevel gear 6, and the sliding rod 3 can move towards the left side by arranging, the first gear 10 is not meshed with the second gear 13, and the second bevel gear 11 is meshed with the first bevel gear 6, so that the second threaded rod 5 is driven to rotate.

Threaded connection has screw sleeve one 12 on threaded rod one 4, threaded rod one 4's left end fixedly connected with gear two 13, and gear two 13 and gear one 10 meshing, through setting up gear two 13 and gear one 10 meshing, can make slide bar 3 drive threaded rod one 4 when rotating and rotate, the integrality of structure has been realized, screw sleeve one 12's last fixed surface is connected with L shape pole 15, logical groove 14 and arc one 16 fixed connection are passed to the upper end of L shape pole 15, through setting up L shape pole 15 and arc one 16, can make screw sleeve one 12 drive arc one 16 when removing and remove, thereby fix patient's top of the head position.

The threads on the front side and the rear side of the second threaded rod 5 are reversely arranged, the second threaded rod 5 can drive the second threaded sleeves 17 on the front side and the rear side to reversely move when rotating, the structural integrity is realized, the second threaded sleeves 17 are in threaded connection with the front side and the rear side of the second threaded rod 5, the U-shaped rods 18 are fixedly connected to the upper surfaces of the two second threaded sleeves 17, the two threaded sleeves 17 on the two sides can be moved by arranging the U-shaped rods 18 and the two arc-shaped plates 20, the two arc-shaped plates 20 on the two sides are driven to move by the U-shaped rods 18, so that the two sides of the head of a patient are fixed, the two U-shaped rods 18 are respectively in sliding connection with the sliding holes 19 formed in the front side wall and the rear side wall of the hollow pillow plate 1, the U-shaped rods 18 and the sliding holes 19 are both in square arrangement, and the U-shaped rods, and avoid two arc 20 to take place to rock when removing, two the equal fixedly connected with arc 20 in upper end of two U-shaped poles 18, and all be provided with the cushion on the opposite face of two arc 20 and on the left side wall of arc 16, through set up the cushion on two arc 20 and arc 16, can make arc 16 and arc two 20 more soft when contacting with patient's skin, improved the travelling comfort.

The left side of the front side wall of the front side arc-shaped plate II 20 is fixedly connected with a hollow box 21, the middle parts of the upper side wall and the lower side wall of the hollow box 21 are fixedly connected with a fixed shaft 22, the upper side and the lower side of the fixed shaft 22 are respectively fixedly connected with the upper side wall and the lower side wall of a hollow cylinder 23 through a bearing III, a torsion spring 24 is sleeved outside the fixed shaft 22, the hollow box 21, the fixed shaft 22, the hollow cylinder 23, the torsion spring 24 and a woven fabric belt 25 are arranged, when the lower jaw part of a patient is fixed, the woven fabric belt 25 is driven to rotate by pulling the woven fabric belt 25, the wound woven fabric belt 25 is extended and is fixed at the lower jaw part of the patient in a lap joint manner, the torsion spring 24 is arranged inside the hollow cylinder 23, two ends of the torsion spring 24 are respectively fixedly connected with the hollow cylinder 23 and the fixed shaft 22, and when the woven fabric belt 25 is not used, the torsion force of, the integrality of structure has been realized, with the one end fixed connection who weaves the area 25 on the periphery of hollow section of thick bamboo 23, and weave the area 25 rolling on the periphery of hollow section of thick bamboo 23, through setting up the rolling of weaving area 25 on hollow section of thick bamboo 23, can effectively practice thrift the parking space who weaves the area 25, space utilization has been improved, and the opening that the other end of weaving area 25 was seted up on through hollow box 21 extends to the outside fixedly connected with gag lever post of hollow box 21, through setting up the gag lever post, can avoid weaving the area 25 because of torsion rolling of torsional spring 24 is gone into in the hollow box 21.

A square ring plate 26 is fixedly connected to the left side of the rear side wall of the rear side arc plate two 20, a sliding rod hole 27 is formed in the middle of the rear side wall of the square ring plate 26, a sliding rod 28 is connected in the sliding rod hole 27 in a sliding manner, a clamping plate 29 is fixedly connected to the inside of the square ring plate 26 in an extending manner at the front end of the sliding rod 28, a spring 30 is sleeved outside the sliding rod 28, the clamping plate 29 is supported by the thickness of the woven fabric belt 25 after the woven fabric belt 25 is inserted into the square ring plate 26 by arranging the sliding rod hole 27, the sliding rod 28 is driven by the clamping plate 29 through the elasticity of the spring 30 to slide in the sliding rod hole 27, so that the spring 30 is driven to contract, meanwhile, the clamping plate 29 is driven by the elasticity of the spring 30 to clamp and fix the woven fabric belt 25, the two ends of the spring 30 are fixedly connected with the clamping plate 29 and the square ring plate 26 respectively, a T-shaped sliding groove 31 is fixedly connected to the middle of, equal sliding connection has T shape slider 32 in two T shape spouts 31, through setting up T shape spout 31 and T shape slider 32, can make grip block 29 more stable when removing, and two T shape sliders 32 fixed connection are respectively at the last downside of grip block 29, all be provided with a plurality of pawl 33 on the opposite face of grip block 29 and square ring board 26 front side inner wall, and the most advanced of a plurality of pawl 33 all inclines to the right side, through the most advanced slope to the right side with a plurality of pawl 33, can make fabric belt 25 insert square ring board 26 back from the left side, make the most advanced card of pawl 33 go into in the line on fabric belt 25 surface, thereby avoid fabric belt 25 to take place to become flexible, realized the quick fixed to patient's lower jaw position, fixed effect has been improved.

The method comprises the following operation steps:

s1, when in use, the fixing frame is firstly placed on a nuclear magnetic resonance sickbed body, fixing screws penetrate through four fixing ear plates 35 to fixedly connect the fixing frame with the nuclear magnetic resonance sickbed body, then a patient lies on the sickbed, the neck of the patient lies in the concave position of the concave pillow 7, then the sliding rod 3 is rotated, the sliding rod 3 drives the sliding sleeve 2 to rotate through the sliding strip 8, the gear I10 fixedly connected with the sliding rod 3 drives the gear II 13 which is meshed with the gear II 13 to rotate, the gear II 13 drives the threaded rod I4 fixedly connected with the threaded rod I to rotate, the threaded rod I4 drives the threaded sleeve I12 to move through threaded connection with the threaded sleeve I12, the threaded sleeve I12 drives the L-shaped rod 15 to move, the L-shaped rod 15 drives the arc-shaped plate I16 to move, and the fixing frame stops until a cushion on the arc-shaped plate I16 is contacted with the top of the head of the;

s2, then the slide bar 3 is pushed again, the slide bar 8 slides in the slide groove 9, the first gear 10 is not meshed with the second gear 13 until the second bevel gear 11 is meshed with the first bevel gear 6, then the slide bar 3 is rotated again, the slide bar 3 drives the second bevel gear 11 to rotate, the second bevel gear 11 drives the first bevel gear 6 to rotate, the first bevel gear 6 drives the second threaded rod 5 to rotate, the second threaded rod 5 is reversely arranged through the threads on the front side and the rear side, so that the second threaded sleeves 17 on the front side and the rear side are driven to simultaneously move towards the middle part, the second threaded sleeves 17 on the two sides respectively drive the second arc plates 20 on the front side and the rear side to move towards the middle part until the second arc plates 20 on the two sides are clamped on the two sides;

s3, the limiting rod at the outer end of the woven fabric strip 25 is pulled again to enable the woven fabric strip 25 to extend, meanwhile, the woven fabric strip 25 drives the hollow cylinder 23 to rotate, the hollow cylinder 23 drives one end of the torsion spring 24 to rotate again, then, the woven fabric strip 25 is controlled to be placed at the mandible position of a patient and then penetrates into the square annular plate 26 at the rear side, the square annular plate passes through the inverted teeth 33 at the two sides, the woven fabric strip 25 supports the clamping plate 29 through the thickness of the woven fabric strip, therefore, the clamping plate 29 drives the fixedly connected sliding rod 28 to slide in the sliding rod hole 27, meanwhile, the clamping plate 29 extrudes the spring 30, the T-shaped sliding blocks 32 at the two sides of the clamping plate 29 slide in the T-shaped sliding grooves 31 until the woven fabric strip 25 is tightened, fixation of the mandible position of the head of the patient.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a medical treatment nuclear magnetic resonance examination is with supplementary mount of patient's neck, includes hollow pillow board (1), its characterized in that: the right side wall middle part of hollow pillow board (1) passes through bearing a fixedly connected with sliding sleeve (2), sliding connection has slide bar (3) in sliding sleeve (2), the right side wall top of hollow pillow board (1) passes through the right-hand member optical axis part fixed connection of bearing two and threaded rod one (4), the both ends optical axis part fixed connection of threaded rod two (5) is all passed through at lateral wall middle part around hollow pillow board (1) two respectively, the middle part optical axis part fixedly connected with bevel gear one (6) of threaded rod two (5).

2. The auxiliary head and neck fixing frame for the patient for the medical nuclear magnetic resonance examination as claimed in claim 1, wherein: the upper surface of the hollow pillow plate (1) is provided with a spongy cushion (34), the left side of the upper surface of the spongy cushion (34) is fixedly connected with a concave pillow (7), the left side and the right side of the front side wall and the rear side wall of the hollow pillow plate (1) are fixedly connected with fixed ear plates (35), and the right side of the upper surface of the hollow pillow plate (1) is provided with a through groove (14).

3. The auxiliary head and neck fixing frame for the patient for the medical nuclear magnetic resonance examination as claimed in claim 1, wherein: the front side fixedly connected with draw runner (8) of slide bar (3), and the right-hand member of draw runner (8) extends to hollow pillow board (1) right side fixedly connected with rotor plate, in spout (9) that draw runner (8) sliding connection seted up on sliding sleeve (2) inboard periphery, the left side fixedly connected with gear (10) of slide bar (3), the left end fixedly connected with bevel gear two (11) of slide bar (3), and bevel gear two (11) and bevel gear (6) looks adaptation.

4. The auxiliary head and neck fixing frame for the patient for the medical nuclear magnetic resonance examination as claimed in claim 1, wherein: threaded connection has thread bush (12) on threaded rod (4), the left end fixedly connected with gear two (13) of threaded rod (4), and gear two (13) and gear one (10) meshing, the last fixed surface of thread bush (12) is connected with L shape pole (15), logical groove (14) and arc (16) fixed connection are passed to the upper end of L shape pole (15).

5. The auxiliary head and neck fixing frame for the patient for the medical nuclear magnetic resonance examination as claimed in claim 1, wherein: the front and back side screw thread of two (5) of threaded rod is reverse setting, the equal threaded connection in front and back side of two (5) of threaded rod has thread bush two (17), two the equal fixedly connected with U-shaped pole (18) of upper surface of thread bush two (17), two in slide opening (19) of seting up on the lateral wall around hollow pillow board (1) are followed in U-shaped pole (18) respectively sliding connection, and U-shaped pole (18) and slide opening (19) are square setting, two the equal fixedly connected with arc two (20) in upper end of U-shaped pole (18), and all be provided with the cushion on the opposite face of two arc two (20) and on the left side wall of arc one (16).

6. The auxiliary head and neck fixing frame for the patient for the nuclear magnetic resonance examination of claim 5, wherein: front side preceding lateral wall left side fixed connection of two (20) arcs has hollow box (21), the upper and lower lateral wall middle part fixedly connected with fixed axle (22) of hollow box (21), the upper and lower side of fixed axle (22) all through the bearing three respectively with the upper and lower lateral wall fixed connection of hollow section of thick bamboo (23), fixed axle (22) overcoat is equipped with torsional spring (24), and torsional spring (24) set up inside hollow section of thick bamboo (23), and the both ends of torsional spring (24) respectively with hollow section of thick bamboo (23) and fixed axle (22) fixed connection, on the periphery of hollow section of thick bamboo (23) with the one end fixed connection who weaves strap (25), and weave strap (25) rolling on the periphery of hollow section of thick bamboo (23), and the other end that weaves strap (25) extends to hollow box (21) outside fixedly connected with gag lever post through the opening of seting on hollow box (21).

7. The auxiliary head and neck fixing frame for the patient for the nuclear magnetic resonance examination of claim 5, wherein: a square ring plate (26) is fixedly connected to the left side of the rear side wall of the second arc-shaped plate (20) at the rear side, a sliding rod hole (27) is formed in the middle of the rear side wall of the square ring plate (26), a sliding rod (28) is slidably connected into the sliding rod hole (27), the front end of the sliding rod (28) extends into the square ring plate (26) and is fixedly connected with a clamping plate (29), a spring (30) is sleeved outside the sliding rod (28), two ends of the spring (30) are fixedly connected with the clamping plate (29) and the square ring plate (26) respectively, T-shaped sliding grooves (31) are fixedly connected to the middle of the inner wall of the upper side and the lower side of the square ring plate (26), T-shaped sliding blocks (32) are slidably connected into the two T-shaped sliding grooves (31), the two T-shaped sliding blocks (32) are fixedly connected to the upper side and the lower side of the clamping plate (29) respectively, a plurality of inverted teeth (33) are arranged on the opposite surfaces of the inner walls, and the tips of the plurality of inverted teeth (33) are all inclined towards the right side.