CN114947809A

CN114947809A - Old person's inspection bed suitable for portable magnetic resonance imaging device

Info

Publication number: CN114947809A
Application number: CN202210563651.6A
Authority: CN
Inventors: 闫志凯
Original assignee: Zhongke Weiying Zhejiang Medical Technology Co Ltd
Current assignee: Zhongke Weiying Zhejiang Medical Technology Co Ltd
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2022-08-30

Abstract

The invention relates to the technical field of nuclear magnetic resonance examination, and discloses an old people examination bed suitable for a movable magnetic resonance imaging device, which comprises an examination bed, wherein a combined wheelchair is arranged above the examination bed, a groove is formed in the outer surface of the examination bed, the combined wheelchair comprises a backrest, a seat plate and a baffle plate, the backrest is connected with the seat plate, the baffle plate is arranged on one side of the seat plate, a bolt is arranged in the backrest, the bolt is arranged in the baffle plate, the combined wheelchair further comprises a third rotating rod, a supporting leg, a non-magnetic elastic sheet and a clamping block, a fixing hole is formed in the outer surface of the seat plate, the fixing hole is matched with the clamping block, the backrest, the seat plate, the baffle plate, the supporting leg, the non-magnetic elastic sheet and the clamping block are arranged, the supporting leg is turned over from the position shown in figure 2 to the lower right direction until the clamping block is clamped into the fixing hole under the action of the non-magnetic elastic sheet, at the moment, the combined wheelchair is assembled, so that the patient can be pushed out from the examination room, and the use is convenient.

Description

Old person's inspection bed suitable for portable magnetic resonance imaging device

Technical Field

The invention relates to the technical field of nuclear magnetic resonance examination, in particular to an examination bed for old people, which is suitable for a movable magnetic resonance imaging device.

Background

The nuclear magnetic resonance imaging is also called spin imaging and magnetic resonance imaging, and the position and the type of the atomic nucleus forming the object can be known by detecting the emitted electromagnetic wave through an external gradient magnetic field according to the different attenuation of the released energy in different structural environments in the object by utilizing the nuclear magnetic resonance principle, so that the structural image in the object can be drawn. The use of this technique for imaging internal structures of the human body has resulted in a revolutionary medical diagnostic tool. The application of the rapidly changing gradient magnetic field greatly accelerates the speed of nuclear magnetic resonance imaging, realizes the application of the technology in clinical diagnosis and scientific research, and greatly promotes the rapid development of medicine, neurophysiology and cognitive neuroscience.

Conventional magnetic resonance imaging systems are closed structures with magnetic fields generated by superconducting coils or permanent magnets. The biggest problem with this configuration is that it creates a claustrophobic feeling in the patient and makes it difficult to perform the interventional procedure.

To change this state, there are various open magnetic resonance imaging systems, and particularly, there is a miniaturized movable nuclear magnetic resonance apparatus, in which a magnet is no longer a closed structure, and a static magnetic field is formed by upper and lower magnetic pole faces connected to a vertical yoke (vertical yoke) on one side through upper and lower yokes to form a magnetic circuit. The magnet with the structure can enable a patient to enter from the opening at one side, so that the claustrophobia of the patient is relieved, and meanwhile, a doctor can approach the patient from three sides, so that convenience is provided for interventional therapy.

Traditional large-scale nuclear magnetic resonance instrument all is provided with supporting bed body, conveniently transports patient and carries out nuclear magnetic detection, but miniaturized nuclear magnetic resonance equipment lacks the nuclear magnetic examination bed of transporting patient, because miniaturized nuclear magnetic resonance instrument does not restrict and uses in fixed place, consequently, patient also need have supporting inspection bed. The bed needs to meet the functions of long-distance movement, rising and lying, pushing to a designated detection point and the like of a patient.

Therefore, an examination bed for the elderly suitable for a mobile magnetic resonance imaging device is provided.

Disclosure of Invention

The invention aims to provide an examining table for old people, which is suitable for a mobile magnetic resonance imaging device and achieves the aim of solving the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an old person's inspection bed suitable for portable magnetic resonance imaging device, includes the inspection bed, the top of inspection bed is provided with the combination formula wheelchair, the surface of inspection bed is seted up flutedly, the combination formula wheelchair includes back, seat, baffle, the back is connected with the seat, one side of seat is provided with the baffle, the internally mounted of back has the bolt, the internally mounted of baffle has the bolt.

Preferably, the combined wheelchair further comprises a third rotating rod, a supporting leg, a non-magnetic elastic sheet and a clamping block, wherein a fixing hole is formed in the outer surface of the seat plate and matched with the clamping block, and the non-magnetic elastic sheet is installed on the outer wall of one side of the clamping block, so that the clamping block can obtain the elastic force provided by the non-magnetic elastic sheet.

Preferably, one end of the non-magnetic elastic sheet is installed inside the supporting leg, and the supporting leg is installed inside the seat through the third rotating rod, so that the supporting leg can obtain a supporting force.

Preferably, the support frame is installed to the bottom of inspection bed, three slide bars are installed to the bottom of support frame, three internally mounted of slide bar has dwang two, the removal hole has been seted up to three surface of slide bar, the spout has been seted up to the surface of dwang two, the spout sets up with removal hole intercommunication for dwang two can obtain the holding power.

Preferably, a second sliding rod is installed outside the third sliding rod, a fourth sliding rod is installed inside the second sliding rod, the fourth sliding rod penetrates through the moving hole, a first spring is installed inside the second sliding rod, and one end of the first spring is installed at the bottom of the third sliding rod, so that the first spring can obtain supporting force.

Preferably, the bottom of the third sliding rod is connected with a connecting rope, the connecting rope is connected with the second sliding rod, one end of the connecting rope penetrates through the second sliding rod, a fixing seat is installed at one end of the connecting rope, one end of the second sliding rod penetrates through the fixing seat, and the second sliding rod is connected with the fixing seat, so that the fixing seat can limit the second sliding rod.

Preferably, the externally mounted of slide bar two has the rack, the internally mounted of rack has slide bar one, the rack setting is run through to the one end of slide bar one, the inside at the fixing base is installed to the other end of slide bar one, the outside of rack is provided with the gear, gear and rack meshing, the surface of fixing base set up with the through-hole of rack looks adaptation for the rack can stretch out from the fixing base.

Preferably, dwang one is installed to the bottom of gear, the drive division is installed to the one end of dwang one, the externally mounted of drive division has the drive division case, the inside at the fixing base is installed to the drive division case, the one end of dwang one runs through the setting of drive division case for the dwang one can obtain the holding power.

Preferably, the externally mounted of dwang one has backup pad one, the one end of dwang one runs through backup pad one and sets up, the externally mounted of backup pad one is in the inside of fixing base for the backup pad one can provide the holding power for dwang one.

The invention provides an examining table for old people, which is suitable for a movable magnetic resonance imaging device. The method has the following beneficial effects:

(1) the invention has the advantages that the examination bed, the support frame, the fixing seat, the driving part, the rotating rod I, the gear, the support plate I, the rack, the sliding rod I and the sliding rod II are arranged, so that the support frame drives the examination bed to move, the examination bed is moved out of an examination area, a patient can conveniently lie on the bed, the examination bed can be driven to automatically move out only by opening the driving part, and the examination bed is convenient and simple.

(2) According to the invention, the connecting rope, the third sliding rod, the second rotating rod and the fourth sliding rod are arranged, the third sliding rod is driven to move downwards under the action of the self gravity of the old patient, so that the fourth sliding rod is moved out of the second rotating rod, the examination bed can be kept at the position shown in the figure 2, and then the driving part is reversed, so that the examination bed enters the examination area for examination.

(3) According to the invention, the backrest, the seat plate, the baffle plate, the plug pin, the third rotating rod, the supporting leg, the non-magnetic elastic sheet and the fixture block are arranged, the supporting leg is turned over from the position shown in figure 2 to the lower right until the fixture block is clamped into the fixing hole under the action of the non-magnetic elastic sheet, and at the moment, the combined wheelchair is assembled, so that the patient can be pushed out from an examination room, and the use is convenient.

Drawings

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

FIG. 2 is a front cross-sectional view of the present invention;

FIG. 3 is a top view of the seat plate of the present invention;

FIG. 4 is a top view of the support frame of the present invention;

FIG. 5 is a front view of a third slide bar according to the present invention;

FIG. 6 is a side view of the first sliding rod of the present invention;

FIG. 7 is an enlarged view of the present invention A;

figure 8 is a state view of the wheelchair of the present invention assembled.

In the figure: the multifunctional medical examination bed comprises an examination bed 1, a support frame 2, a fixed seat 3, a driving part 4, a rotating rod I5, a gear 6, a supporting plate I7, a rack 8, a sliding rod I9, a sliding rod II 10, a connecting rope 11, a sliding rod III 12, a rotating rod II 13, a backrest 14, a seat plate 15, a baffle plate 16, a bolt 17, a rotating rod III 18, a supporting leg 19, a non-magnetic elastic sheet 20, a clamping block 21 and a sliding rod IV 22.

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.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships 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 referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 8, the present invention provides a technical solution: the utility model provides an old person's inspection bed suitable for portable magnetic resonance imaging device, including inspection bed 1, the top of inspection bed 1 is provided with the combination formula wheelchair, the surface of inspection bed 1 is seted up flutedly, the combination formula wheelchair includes back 14, seat 15, baffle 16, back 14 passes through movable rod one with seat 15, bearing one swing joint, seat 15 passes through movable rod two with baffle 16, bearing two swing joint, the inner wall of back 14 and the outer wall sliding connection of bolt 17, one end of bolt 17 runs through back 14 in proper order, the outer wall of seat 15 is gone into at last the card in seat 15, the inner wall of baffle 16 and the outer wall sliding connection of bolt 17, one end of bolt 17 runs through baffle 16 in proper order, the outer wall of seat 15 is gone into at last the card in seat 15, can be fixed back 14, the position of baffle 16, the combination formula wheelchair still includes dwang three 18, 19, nonmagnetic shell fragment 20, A fixture block 21, a fixing hole is arranged on the outer surface of the seat plate 15 and is matched with the fixture block 21, the outer wall of one side of the fixture block 21 is fixedly connected with one end of a non-magnetic elastic sheet 20, one end of the non-magnetic elastic sheet 20 is fixedly arranged on the inner wall of a supporting leg 19, the supporting leg 19 is movably arranged on the inner wall of the seat plate 15 through a third rotating rod 18 and a third bearing, moving wheels are respectively arranged on one side of a baffle 16 far away from the seat plate 15 and one side of the supporting leg 19 far away from the third rotating rod 18, when a patient is a paralyzed old patient, the patient is placed on the examination bed 1 through a combined wheelchair matched with the examination bed 1, the backrest 14 and the baffle 16 are placed flat through pulling out the bolt 17, then the fixture block 21 is pushed out from the fixing hole through fingers, when the block 21 is completely removed from the fixing hole, the support legs 19 are folded to the position shown in fig. 2, so that the combination wheelchair is laid on the examination table 1, and the patient is examined.

After the examination is finished, the combined wheelchair is taken down from the examination bed 1, the baffle 16 is turned over from the position shown in fig. 2 to the lower right, the backrest 14 is turned over from the position shown in fig. 2 to the upper left until the baffle is in a proper position, the bolt 17 is inserted into the seat plate 15 again to fix the baffle, the supporting leg 19 is turned over from the position shown in fig. 2 to the lower right until the fixture block 21 is clamped into the fixing hole under the action of the nonmagnetic elastic sheet 20, and at the moment, the combined wheelchair is assembled to be finished, so that the patient can be pushed out from the examination room and the use is convenient;

the bottom of the examination bed 1 is fixedly connected with the top of the support frame 2, the bottom of the support frame 2 is fixedly connected with the top of the sliding rod III 12, the inner wall of the sliding rod III 12 is movably connected with the outer wall of the rotating rod II 13 through a bearing IV, the outer surface of the sliding rod III 12 is provided with a moving hole, the outer surface of the rotating rod II 13 is provided with a sliding groove, as shown in figure 5, the sliding groove is communicated with the moving hole, the outer wall of the sliding rod III 12 is slidably connected with the inner wall of the sliding rod II 10, the inner wall of the sliding rod II 10 is movably connected with the outer wall of the sliding rod IV 22 through a bearing V, the sliding rod IV 22 passes through the moving hole, the inner wall of the sliding rod II 10 is fixedly connected with one end of the spring I, one end of the spring I is fixedly installed at the bottom of the sliding rod III 12, the bottom of the sliding rod III 12 is fixedly connected with one end of the connecting rope 11, the outer wall of the connecting rope 11 is slidably connected with the inner wall of the sliding rod II 10, one end of a connecting rope 11 penetrates through the outer wall of the second sliding rod 10 and extends to the outside of the second sliding rod 10, one end of the connecting rope 11 is fixedly connected with the bottom of the inner wall of the fixed seat 3, one end of the second sliding rod 10 penetrates through the outer wall of the fixed seat 3 and extends to the inside of the fixed seat 3, the outer wall of the second sliding rod 10 is in sliding connection with the inner wall of the fixed seat 3, when the examination bed 1 moves to the left side from the position shown in figure 2, the distance between one end, close to the driving part, of the connecting rope 11 and the third sliding rod 12 is shortened through the arrangement of the connecting rope 11, the third sliding rod 12 cannot provide downward tensile force for the third sliding rod 12 any more, the third sliding rod 12 moves upwards under the action of the first spring, the third sliding rod 12 drives the support frame 2 to move upwards so as to drive the examination bed 1 to move upwards, until the fourth sliding rod 22 is clamped into a sliding groove formed in the outer surface of the second rotating rod 13, can rotate inspection bed 1 with the hand this moment for one side that inspection bed 1 leaned on left uses dwang two 13 to overturn downwards as the axle center, conveniently lets inconvenient old patient who climbs up inspection bed 1, lies after inspection bed 1 is gone up to old patient, and medical personnel lift one side of inspection bed 1.

It should be noted that the driving portion 4 may be a non-magnetic motor or a manual crank 23, as long as the rotating rod one 5 can be rotated. If the manual crank 23 is adopted, the phase-change driving can be realized by using a worm gear mechanism in the driving part 4. This technique is prior art and will not be described herein in any greater detail.

When the sliding chute and the moving hole are moved to the position shown in figure 2, the sliding rod III 12 is driven to move downwards under the action of the self gravity of the elderly patient, the sliding rod IV 22 is moved out of the rotating rod II 13, the examination bed 1 can be kept at the position shown in figure 2, then the driving part 4 is reversed, the examination bed 1 enters an examination area to be examined, the outer wall of the sliding rod II 10 is fixedly connected with one end of the rack 8, the inner wall of the rack 8 is slidably connected with the outer wall of the sliding rod I9, one end of the sliding rod I9 penetrates through the outer wall of the rack 8 and extends into the rack 8, the other end of the sliding rod I9 is fixedly arranged on the inner wall of the fixed seat 3, the gear 6 is arranged outside the rack 8, the gear 6 is meshed with the rack 8, the bottom of the gear 6 is fixedly connected with one end of the rotating rod I5, one end of the rotating rod I5 is fixedly arranged on the output end of the driving part 4 through a coupler, the driving part box is fixedly arranged outside the driving part 4, the driving part box is fixedly arranged on the inner wall of the fixed seat 3, one end of the rotating rod I5 penetrates through the driving part box, the outer wall of the rotating rod I5 is movably connected with the inner wall of the supporting plate I7 through a bearing, one end of the rotating rod I5 penetrates through the supporting plate I7, the outer wall of the supporting plate I7 is arranged on the inner wall of the fixed seat 3, the examination bed 1, the supporting frame 2, the fixed seat 3, the driving part 4, the rotating rod I5, the gear 6, the supporting plate I7, the rack 8, the sliding rod I9 and the sliding rod II 10 are arranged, the rotating rod I5 is driven by the driving part 4 to rotate, the gear I5 drives the gear 6 to rotate, the gear 6 drives the rack 8 to move, the sliding rod I9 limits the rack 8 and provides supporting force for the rack 8, the rack 8 drives the sliding rod II 10 to move, so that the sliding rod II 10 drives the sliding rod III 12 to move, therefore, the support frame 2 drives the examination bed 1 to move, the examination bed 1 is moved out from the examination area, a patient can conveniently go to the bed and lie on the bed, the examination bed 1 can be driven to automatically move out only by opening the driving part 4, and the examination bed is convenient and simple.

When the examination bed is used, the examination bed 1, the support frame 2, the fixing seat 3, the driving part 4, the first rotating rod 5, the gear 6, the first support plate 7, the rack 8, the first sliding rod 9 and the second sliding rod 10 are arranged, the first rotating rod 5 is driven to rotate by the driving part 4, the first rotating rod 5 drives the gear 6 to rotate, the gear 6 drives the rack 8 to move, the first sliding rod 9 limits the rack 8 and provides support force for the rack 8, the rack 8 drives the second sliding rod 10 to move, the second sliding rod 10 drives the third sliding rod 12 to move, the support frame 2 drives the examination bed 1 to move, the examination bed 1 is moved out of an examination area, a patient can conveniently lie on the bed, the examination bed 1 can be driven to automatically move out only by opening the driving part 4, convenience and simplicity are achieved, the examination bed 1 can be automatically moved out by arranging the connecting rope 11, the third sliding rod 12, the second rotating rod 13 and the fourth sliding rod 14 when the examination bed 1 moves towards the left side from the position shown in figure 2, the distance between one end of the connecting rope 11 close to the driving part and the sliding rod III 12 is shortened, so that the connecting rope 11 can not provide downward pulling force for the sliding rod III 12 any more, the sliding rod III 12 moves upwards under the action of the spring I, the sliding rod III 12 drives the support frame 2 to move upwards so as to drive the examination bed 1 to move upwards, until the sliding rod IV 22 is clamped into the sliding groove formed in the outer surface of the rotating rod II 13, at the moment, the examination bed 1 can be rotated by hand, so that the left side of the examination bed 1 is turned downwards by taking the rotating rod II 13 as an axis, and an old patient who is inconvenient to climb up can conveniently climb the examination bed 1, after the old patient lies on the examination bed 1, medical personnel lift one side of the examination bed 1, when the sliding groove and the moving hole move to the position shown in figure 2, the sliding rod III 12 is driven to move downwards under the action of the self gravity of the old patient, so that the sliding rod IV 22 moves out from the rotating rod II 13, the examining table 1 can be kept at the position shown in fig. 2, then the driving part 4 is reversed, so that the examining table 1 enters the examining area for examination, and when the patient is a paralyzed old patient, the backrest 14, the seat plate 15, the baffle plate 16, the bolt 17, the third rotating rod 18, the supporting legs 19, the non-magnetic elastic sheet 20 and the fixture block 21 are arranged.

The patient is placed on the examination bed 1 through the combined wheelchair matched with the examination bed 1, the backrest 14 and the baffle plate 16 are placed flat by pulling out the bolt 17, then the fixture block 21 is pushed out of the fixing hole by fingers, when the fixture block 21 is completely moved out of the fixing hole, the support leg 19 is turned to the position shown in figure 2, so that the combined wheelchair is flatly placed on the examination bed 1, the patient is examined, after the examination is completed, the combined wheelchair is taken down from the examination bed 1, the baffle plate 16 is turned to the right lower side from the position shown in figure 2, the backrest 14 is turned to the left upper side from the position shown in figure 2 until the position is proper, the bolt 17 is inserted into the seat plate 15 again to fix the combined wheelchair, the support leg 19 is turned to the right lower side from the position shown in figure 2 until the fixture block 21 is clamped into the fixing hole under the action of the nonmagnetic elastic sheet 20, at the moment, the combined wheelchair is assembled, so that the patient can be pushed out from the examination room, and the use is convenient.

It should be noted that, the above structures are all made of non-magnetic materials, and the non-magnetic materials belong to the prior art and are not the technical points protected by this document, so too much description is not made.

In conclusion, although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An old person's inspection bed suitable for portable magnetic resonance imaging device, includes inspection bed (1), its characterized in that: the top of inspection bed (1) is provided with the combination formula wheelchair, the surface of inspection bed (1) is seted up flutedly, the combination formula wheelchair includes back (14), seat (15), baffle (16), back (14) are connected with seat (15), one side of seat (15) is provided with baffle (16), the internally mounted of back (14) has bolt (17), the internally mounted of baffle (16) has bolt (17).

2. The geriatric examination bed suitable for use in a mobile magnetic resonance imaging device of claim 1, wherein: the combined wheelchair further comprises a third rotating rod (18), supporting legs (19), a non-magnetic elastic sheet (20) and a clamping block (21), a fixing hole is formed in the outer surface of the seat plate (15), the fixing hole is matched with the clamping block (21), and the non-magnetic elastic sheet (20) is installed on the outer wall of one side of the clamping block (21).

3. An examination bed for elderly people suitable for use in a mobile magnetic resonance imaging apparatus according to claim 2, wherein: one end of the non-magnetic elastic sheet (20) is arranged in the supporting leg (19), and the supporting leg (19) is arranged in the seat plate (15) through the third rotating rod (18).

4. An examination couch adapted for a mobile mri apparatus for elderly people according to claim 1, wherein: support frame (2) are installed to the bottom of inspection bed (1), three (12) of slide bar are installed to the bottom of support frame (2), the internally mounted of three (12) of slide bar has dwang two (13), the removal hole has been seted up to the surface of slide bar three (12), the spout has been seted up to the surface of dwang two (13), the spout sets up with removing the hole intercommunication.

5. The geriatric examination bed suitable for use in a mobile magnetic resonance imaging device of claim 4, wherein: the outer mounting of slide bar three (12) has slide bar two (10), the internally mounted of slide bar two (10) has slide bar four (22), slide bar four (22) pass from removing the hole, the internally mounted of slide bar two (10) has spring one, the bottom at slide bar three (12) is installed to the one end of spring one.

6. The geriatric examination bed suitable for use in a mobile magnetic resonance imaging device of claim 5, wherein: the bottom of slide bar three (12) is connected with connects rope (11), connect rope (11) and be connected with slide bar two (10), the one end of connecting rope (11) runs through slide bar two (10) and sets up, fixing base (3) are installed to the one end of connecting rope (11), the one end of slide bar two (10) runs through fixing base (3) and sets up, slide bar two (10) are connected with fixing base (3).

7. The geriatric examination bed suitable for use in a mobile magnetic resonance imaging device of claim 6, wherein: the outside mounting of slide bar two (10) has rack (8), the internally mounted of rack (8) has slide bar (9), the one end of slide bar (9) runs through rack (8) and sets up, the inside at fixing base (3) is installed to the other end of slide bar (9), the outside of rack (8) is provided with gear (6), gear (6) and rack (8) meshing.

8. The geriatric examination bed suitable for use in a mobile magnetic resonance imaging device of claim 7, wherein: dwang one (5) is installed to the bottom of gear (6), drive division (4) are installed to the one end of dwang one (5), the externally mounted of drive division (4) has the drive division case, the inside at fixing base (3) is installed to the drive division case, the one end of dwang one (5) runs through the drive division case setting.

9. The geriatric examination bed suitable for use in a mobile magnetic resonance imaging device of claim 8, wherein: the externally mounted of dwang (5) has backup pad (7), the one end of dwang (5) runs through backup pad (7) and sets up, the externally mounted of backup pad (7) is in the inside of fixing base (3).