CN109646014B

CN109646014B - Otology hearing test assistor

Info

Publication number: CN109646014B
Application number: CN201811596535.4A
Authority: CN
Inventors: 王德利; 张艳芬; 李爱根
Original assignee: Individual
Current assignee: Wang Deli
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2021-07-13
Anticipated expiration: 2038-12-26
Also published as: CN109646014A

Abstract

The invention relates to an assistor, in particular to an assistor for otology hearing tests. Therefore, the technical problems of the invention are as follows: the otology hearing test assistor can make nurses feel easier and improve test accuracy. The technical scheme is as follows: an otology hearing test assistor comprises an annular sleeve, a semicircular plate, a cross bar, an arc-shaped block, a hollow tube, a first spring, a solid rod, a guide sleeve, a connecting block, a universal joint sleeve, a universal joint ball, a connecting rod and the like; the annular cover top rigid coupling has the semicircle board, and the annular cover left and right sides symmetric connection has the horizontal pole, and the horizontal pole outer end is connected with the arc piece, and two equal rotary types in horizontal pole front side are connected with the hollow tube, are connected with first spring between hollow tube and the arc piece, are equipped with the solid pole that the shape is the rectangle in the hollow tube. According to the invention, the ears of the patient can be covered by the arc-shaped plate and the annular rubber ring, so that a nurse is not required to cover the ears of the patient by hands, and the nurse can feel more relaxed.

Description

Otology hearing test assistor

Technical Field

The invention relates to an assistor, in particular to an assistor for otology hearing tests.

Background

The hearing test is mainly used for checking the hearing loss degree, is a diagnosis mode of hearing function state and auditory system diseases, in otology, in order to judge the state of an illness of a patient, the hearing test needs to be carried out on the patient, a nurse generally covers the ears of the patient with hands, and then the hearing test is carried out, but the hearing test generally needs a long time, so that the hands of the nurse are easy to fatigue, and the accuracy of the test can be influenced by slightly moving the hands of the nurse.

Disclosure of Invention

In order to overcome the defects that a nurse easily gets tired when covering the ears of a patient with hands and then performs a hearing test, and the accuracy of the test is possibly affected when the nurse moves the hands a little, the technical problem of the invention is as follows: the otology hearing test assistor can make nurses feel easier and improve test accuracy.

The technical scheme is as follows: an otology hearing test assistor comprises an annular sleeve, a semicircular plate, cross rods, arc-shaped blocks, hollow tubes, first springs, solid rods, guide sleeves, connecting blocks, universal joint sleeves, universal joint balls, connecting rods, the arc-shaped plates, annular rubber rings and a height adjusting mechanism, wherein the semicircular plate is fixedly connected to the top of the annular sleeve, the cross rods are symmetrically connected to the left side and the right side of the annular sleeve, the arc-shaped blocks are connected to the outer ends of the cross rods, the hollow tubes are rotatably connected to the front sides of the two cross rods, the first springs are connected between the hollow tubes and the arc-shaped blocks, the rectangular solid rods are arranged in the hollow tubes, the guide sleeves are fixedly connected to the lower portions of the left sides of the left hollow tubes, the guide sleeves are fixedly connected to the lower portions of the right sides of the hollow tubes, the hollow tubes are located in the guide sleeves, the universal joint sleeves are fixedly connected to the bottoms of the solid rods through the, universal joint ball left side on right side also is connected with the arc through the connecting rod, and left arc right side rigid coupling has the annular rubber circle that is used for sealing the ear, and the also rigid coupling in the arc left side on right side has the annular rubber circle, all is equipped with the height control mechanism who is used for adjusting the arc height on two hollow tubes.

Further explain, height adjusting mechanism is including the latch, fixture block and first shell fragment, the solid pole left side on left solid pole right side and right side all evenly spaced rigid coupling has the latch, left hollow tube left side lower part is opened has the guide hole that plays the guide effect, hollow tube right side lower part on right side also is opened has the guide hole, all be equipped with the fixture block that is used for blocking the latch in two guide holes, fixture block and latch cooperation, left hollow tube right side lower part rigid coupling has first shell fragment, hollow tube left side lower part on right side also rigid coupling has first shell fragment, first shell fragment and fixture block contact.

Further explain, still including the eye shielding mechanism, the eye shielding mechanism is including the pivot, the friction pulley, the second shell fragment, the arc board, the friction disc, the connecting plate, the shielding plate, sponge piece and shielding block, annular cover front side middle part rotary type is connected with the pivot, the equal rigid coupling in both ends has the friction pulley about the pivot, the left and right sides of annular cover front side all is connected with the second shell fragment, the arc board is connected to the second shell fragment front end rigid coupling, the inboard rigid coupling of arc piece board has the friction disc that is used for increasing the friction pulley frictional force, friction disc and friction pulley contact, pivot front side rigid coupling has the connecting plate, the rigid coupling has the shielding plate that is used for sheltering from eyes on the connecting plate, the left and right sides of shielding plate rear side all is connected with the sponge piece, shielding plate top intermediate.

Further, the universal joint comprises a screw rod and a pressing block, screw holes are formed in the left side of the universal joint sleeve on the left side and the right side of the universal joint sleeve on the right side, the screw rods capable of moving left and right are arranged in the two screw holes, and the pressing block which has a fixing effect is connected to the two screw rods in a rotating mode.

Further explanation, still including moving the cover, the second spring, the elasticity kelly, the trip, the mounting panel, rubber tooth piece and rubber pinion rack, it has the removal cover that can control to all overlap on two connecting rods, be connected with the second spring between removal cover and the universal joint ball, the second spring is around on the connecting rod, two connecting rod tops all rigid couplings have the elasticity kelly that the shape is 7 shapes, it all is connected with the shape for curved mounting panel to move the cover both sides from top to bottom, mounting panel left side lower part and the upper right side mounting panel right side lower part on the left side all are connected with the trip, the inboard evenly spaced rubber tooth piece that has played the fixed action of mounting panel of the left and right sides, the arc outside rigid coupling of the left and right sides has the rubber pinion rack that plays the fixed action, rubber pinion rack and rubber tooth piece cooperation.

When needs carry out the hearing test, the outside pulling hollow tube of nurse, first spring is compressed, the outside swing of hollow tube drives the connecting block outwards through solid core bar, thereby drive the outside swing of universal joint cover, the arc outwards swings thereupon, when the arc outwards swings to suitable position, the nurse stops the pulling hollow tube, then overlap annular cover at patient overhead, again control height adjusting mechanism and adjust the arc to suitable height, can loosen the hollow tube, the inside swing of hollow tube under the effect of first spring, the arc inwards swings thereupon, the nurse is suitable again stir the arc, make annular rubber circle be located patient's ear periphery, cover patient's ear, can carry out the hearing test, then need not the nurse and cover patient's ear with the hand, thereby can let nurse's light more. After the test is finished, the nurse pulls the hollow tube outwards to enable the arc-shaped plate to swing outwards, and then the annular sleeve is taken away from the head of the patient.

When the height of arc is adjusted to needs, the nurse upwards or moves the connecting block downwards, drives solid pole upwards or moves down, under the effect of first shell fragment, the fixture block slides on the latch, still drives universal joint cover upwards or moves down when the connecting block upwards or moves down, and the arc upwards or moves down thereupon, adjusts the height of arc to can be applicable to different patients. When the arc was parallel and level with patient's ear, the nurse can loosen the connecting block, and the fixture block can block the latch, avoids solid pole to remove to can avoid the arc to remove.

The nurse promotes the shielding plate forward, makes the sponge piece cover patient's eyes, and the shielding piece can block external light, so, can get rid of the interference of eyesight, makes patient's attention concentrate more to can improve the degree of accuracy of test. The friction plate is contacted with the friction wheel to increase friction force, and under the action of the second elastic sheet, the friction plate is always contacted with the friction wheel, so that the friction wheel cannot easily rotate, the rotating shaft cannot easily rotate, and the shielding plate cannot easily move.

When patient's ear is sealed to arc and annular rubber circle, the nurse can the screw rod of the internal rotation left and right sides, drives the briquetting inward movement of the left and right sides, pushes down the universal joint ball to can avoid arc and annular rubber circle to shift and lead to influencing the hearing test. When the pressing block presses the universal joint ball, the nurse stops rotating the screw.

The nurse can stimulate left removal cover left, it moves left to drive left mounting panel, thereby drive left trip and move left, left second spring is compressed, move left when being blocked by left elasticity kelly when left trip, the nurse loosens left removal cover, then overlap the gauze on left arc, and make the both ends of gauze be located between left rubber tooth piece and the left rubber toothed bar, stir left elasticity kelly again left, loosen left trip, left removal cover moves right under the effect of left side second spring, it moves right to drive left mounting panel, left rubber tooth piece moves right thereupon and pushes down the gauze, fix the gauze on left arc, the nurse repeats above-mentioned opposite operation again, fix another gauze on the arc on right side. So, can avoid patient's ear direct and arc contact to lead to infecting the bacterium on the arc.

The invention has the beneficial effects that: according to the invention, the ears of the patient can be covered by the arc-shaped plate and the annular rubber ring, so that a nurse is not required to cover the ears of the patient by hands, and the nurse can feel easier; the height of the arc-shaped plate can be adjusted through the height adjusting mechanism, so that the device can be suitable for different patients; the eyes of the patient can be covered by the eye covering mechanism, so that the interference of the vision is eliminated, the attention of the patient is more concentrated, and the accuracy of the test can be improved; the pressing block can press the universal joint ball, so that the influence on the hearing test caused by the displacement of the arc plate and the annular rubber ring can be avoided; the gauze can be fixed on the arc-shaped plate, so that the phenomenon that the ears of a patient directly contact with the arc-shaped plate to cause bacteria infection on the arc-shaped plate is avoided.

Drawings

Fig. 1 is a schematic front view of the present invention.

Fig. 2 is an enlarged schematic view of part a of the present invention.

Fig. 3 is a partial left view structural diagram of the present invention.

The meaning of the reference symbols in the figures: 1 … annular sleeve, 2 … semicircular plate, 3 … cross bar, 4 … arc block, 5 … hollow tube, 6 … first spring, 7 … solid rod, 8 … guide sleeve, 9 … connecting block, 10 … universal joint sleeve, 11 … universal joint ball, 12 … connecting rod, 13 … arc plate, 14 … annular rubber ring, 15 … height adjusting mechanism, 151 … latch, 152 … guide hole, 153 … latch, 154 … first spring plate, 16 … eye shielding mechanism, 161 …

rotating shaft

162, 162 … friction wheel, 163 … second spring plate, 164 friction plate … arc plate, 165 …, 166 …, connecting plate 167 … shutter, 168 … sponge block, 169 … shutter, 17 … screw hole, 18 … screw, 3619 press block, 20 … moving sleeve, 21 … second spring, 22 … elastic latch rod, 23 … elastic latch rod, 24, … mounting plate, … rubber toothed plate, 3625 hook plate, 3626 rubber toothed plate.

Detailed Description

Although the present invention may be described with respect to particular applications or industries, those skilled in the art will recognize the broader applicability of the invention. Those of ordinary skill in the art will recognize other factors such as: terms such as above, below, upward, downward, and the like are used to describe the accompanying drawings and are not meant to limit the scope of the invention, which is defined by the appended claims. Such as: any numerical designation of first or second, and the like, is merely exemplary and is not intended to limit the scope of the invention in any way.

Example 1

An otology hearing test assistor is shown in figures 1-3 and comprises an annular sleeve 1, a semicircular plate 2, a cross rod 3, an arc-shaped block 4, a hollow tube 5, a first spring 6, a solid rod 7, a guide sleeve 8, a connecting block 9, a universal joint sleeve 10, a universal joint ball 11, a connecting rod 12, an arc-shaped plate 13, an annular rubber ring 14 and a height adjusting mechanism 15, wherein the semicircular plate 2 is fixedly connected to the top of the annular sleeve 1, the cross rod 3 is symmetrically connected to the left side and the right side of the annular sleeve 1, the outer end of the cross rod 3 is connected with the arc-shaped block 4, the hollow tube 5 is rotatably connected to the front sides of the two cross rods 3, the first spring 6 is connected between the hollow tube 5 and the arc-shaped block 4, the solid rod 7 with a rectangular shape is arranged in the hollow tube 5 on the left side, the guide sleeve 8 for guiding is fixedly connected to the lower part of the left side, 7 bottoms of solid bar have universal joint cover 10 through connecting block 9 rigid couplings, be equipped with rotatable universal joint ball 11 in the

universal joint cover

10, 11 right side rigid couplings of left universal joint ball have the arc 13 that is used for sealing the ear, 11 left sides of universal joint ball on right side also are connected with arc 13 through connecting

rod

12, 13 right sides rigid couplings of left arc have the annular rubber circle 14 that is used for sealing the ear, 13 left sides of arc on right side also rigid couplings have annular rubber circle 14, all be equipped with height control mechanism 15 that is used for adjusting the height of arc 13 on two hollow tubes 5.

Example 2

universal joint cover

rod

Height adjusting mechanism 15 is including latch 151, fixture block 153 and first shell fragment 154, solid pole 7 left side on left side 7 right side and right side all evenly spaced's rigid coupling has

latch

151, 5 left side lower parts of left hollow tube open has guide hole 152 of effect of direction, 5 right side lower parts of hollow tube on right side have also opened guide hole 152, all be equipped with the fixture block 153 that is used for blocking latch 151 in two guide holes 152, fixture block 153 and latch 151 cooperation, 5 right side lower parts rigid couplings of left hollow tube have

first shell fragment

154, 5 left side lower parts of hollow tube on right side also rigid coupling have first shell fragment 154, first shell fragment 154 and fixture block 153 contact.

Example 3

universal joint cover

rod

latch

first shell fragment

Still including hiding eye mechanism 16, hide eye mechanism 16 including the pivot 161, the friction pulley 162, second shell fragment 163, arc piece board 164, friction disc 165, connecting plate 166, shielding plate 167, sponge piece 168 and hide the piece 169, annular cover 1 front side middle part rotary type is connected with pivot 161, both ends all rigid coupling has friction pulley 162 about pivot 161, the left and right sides of annular cover 1 front side all is connected with second shell fragment 163, second shell fragment 163 front end rigid coupling has arc piece board 164, the inboard rigid coupling of arc piece board 164 has the friction disc 165 that is used for increasing friction wheel 162 frictional force, friction disc 165 and friction pulley 162 contact, pivot 161 front side rigid coupling has connecting plate 166, the rigid coupling has the shielding plate 167 that is used for sheltering from eyes on the connecting plate 166, the left and right sides of shielding plate 167 rear side all is connected with sponge piece 168, shielding plate 167 top intermediate connection has the piece 169 that is used for sheltering from the sunshine.

Example 4

universal joint cover

rod

latch

first shell fragment

The universal joint sleeve structure is characterized by further comprising screw rods 18 and pressing blocks 19, screw holes 17 are formed in the left side of the universal joint sleeve 10 on the left side and the right side of the universal joint sleeve 10 on the right side, the screw rods 18 capable of moving left and right are arranged in the two screw holes 17, and the pressing blocks 19 having a fixing effect are connected to the two screw rods 18 in a rotating mode.

Example 5

universal joint cover

rod

latch

first shell fragment

Still including removing cover 20, the second spring 21, elasticity kelly 22, trip 23, mounting panel 24, rubber tooth piece 25 and rubber pinion rack 26, it has the removal cover 20 that can control the removal all to overlap on two connecting rods 12, be connected with second spring 21 between removal cover 20 and the universal joint ball 11, second spring 21 is around on connecting rod 12, the equal rigid coupling in two connecting rod 12 tops has the elasticity kelly 22 that the shape is 7 shapes, it all is connected with the shape for curved mounting panel 24 to remove cover 20 upper and lower both sides, mounting panel 24 left side lower part and the upper right side of upper left side all are connected with trip 23, the inboard even spaced rubber tooth piece 25 that plays the fixed action that is connected with of mounting panel 24 of the left and right sides, the arc 13 outside rigid coupling of the left and right sides has the rubber pinion rack 26 that plays the fixed action, rubber pinion rack 26 cooperates with rubber tooth piece 25.

When a hearing test is needed, a nurse pulls the hollow tube 5 outwards, the first spring 6 is compressed, the hollow tube 5 swings outwards, the solid rod 7 drives the connecting block 9 to swing outwards, thereby driving the universal joint sleeve 10 to swing outwards, the arc-shaped plate 13 swings outwards along with the universal joint sleeve, when the arc-shaped plate 13 swings outwards to a proper position, a nurse stops pulling the hollow tube 5, then the annular sleeve 1 is sleeved on the head of a patient, the height adjusting mechanism 15 is controlled to adjust the arc-shaped plate 13 to a proper height, the hollow tube 5 can be loosened, the hollow tube 5 swings inwards under the action of the first spring 6, the arc-shaped plate 13 swings inwards along with the swing, the nurse then properly stirs the arc-shaped plate 13 to enable the annular rubber ring 14 to be positioned at the periphery of the ears of the patient to cover the ears of the patient, can carry out the hearing test, then need not the nurse and cover patient's ear with the hand to can let nurse's relaxation more. After the test is finished, the nurse pulls the hollow tube 5 outwards to enable the arc-shaped plate 13 to swing outwards, and then the annular sleeve 1 is taken away from the head of the patient.

When the height of arc 13 needs to be adjusted, the nurse moves connecting block 9 upwards or downwards, drives solid bar 7 upwards or downwards, under the effect of first shell fragment 154, and fixture block 153 slides on latch 151, and connecting block 9 still drives universal joint cover 10 upwards or downwards when upwards or downwards moving, and arc 13 upwards or downwards moves along with it, adjusts the height of arc 13 to can be applicable to different patients. When arc 13 and patient's ear parallel and level, the nurse can loosen connecting block 9, and fixture block 153 can block latch 151, avoids solid rod 7 to remove to can avoid arc 13 to remove.

The nurse pushes the shielding plate 167 forward, so that the sponge block 168 shields the eyes of the patient, and the shielding block 169 can shield the outside light, thus the interference of the vision can be eliminated, the attention of the patient is more concentrated, and the accuracy of the test can be improved. The friction plate 165 contacts with the friction wheel 162 to increase friction force, and under the action of the second elastic sheet 163, the friction plate 165 always contacts with the friction wheel 162, so that the friction wheel 162 cannot easily rotate, the rotating shaft 161 cannot easily rotate, and the shielding plate 167 cannot easily move.

When arc 13 and annular rubber circle 14 cover patient's ear, the nurse can inwards rotate the screw rod 18 of the left and right sides, drive the briquetting 19 inward movement of the left and right sides, push down universal joint ball 11 to can avoid arc 13 and annular rubber circle 14 to shift and lead to influencing the hearing test. When pressure piece 19 presses ball 11, the nurse stops turning screw 18.

The nurse can pull the left moving sleeve 20 to the left, drive the left mounting plate 24 to move to the left, thereby driving the left hook 23 to move leftwards, the left second spring 21 is compressed, when the left hook 23 moves leftwards and is blocked by the left elastic clamping rod 22, the nurse releases the left moving sleeve 20, then the gauze is sleeved on the arc-shaped plate 13 at the left side, the two ends of the gauze are positioned between the rubber tooth block 25 at the left side and the rubber toothed plate 26 at the left side, the elastic clamping rod 22 at the left side is shifted leftwards, the clamping hook 23 at the left side is loosened, the left moving sleeve 20 moves rightwards under the action of the left second spring 21, the left mounting plate 24 is driven to move rightwards, the left rubber tooth block 25 moves rightwards along with the right mounting plate to press gauze, the gauze is fixed on the left arc-shaped plate 13, and the nurse repeats the reverse operation again to fix the other gauze on the right arc-shaped plate 13. Therefore, the phenomenon that the ears of a patient directly contact with the arc-shaped plate 13 to cause bacteria infection on the arc-shaped plate 13 can be avoided.

It should be understood that this example is only for illustrating the present invention and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Claims

1. An otology hearing test assistor comprises an annular sleeve (1), semicircular plates (2), cross rods (3), arc-shaped blocks (4), hollow pipes (5), first springs (6), solid rods (7) and guide sleeves (8), wherein the semicircular plates (2) are fixedly connected to the top of the annular sleeve (1), the cross rods (3) are symmetrically connected to the left side and the right side of the annular sleeve (1), the outer ends of the cross rods (3) are connected with the arc-shaped blocks (4), the hollow pipes (5) are rotatably connected to the front sides of the two cross rods (3), the first springs (6) are connected between the hollow pipes (5) and the arc-shaped blocks (4), the solid rods (7) with rectangular shapes are arranged in the hollow pipes (5), the guide sleeves (8) with guiding functions are fixedly connected to the lower portions of the left sides in the hollow pipes (5) on the left side, the guide sleeves (8) are fixedly connected to the lower portions of the right, the method is characterized in that: also comprises a connecting block (9), a universal joint sleeve (10), a universal joint ball (11), a connecting rod (12), an arc-shaped plate (13), an annular rubber ring (14) and a height adjusting mechanism (15), the bottom end of a solid rod (7) is fixedly connected with a universal joint sleeve (10) through a connecting block (9), a rotatable universal joint ball (11) is arranged in the universal joint sleeve (10), the right side of the left universal joint ball (11) is fixedly connected with an arc plate (13) used for sealing ears, the left side of the right universal joint ball (11) is also connected with the arc plate (13) through a connecting rod (12), the right side of the left arc plate (13) is fixedly connected with an annular rubber ring (14) used for sealing ears, the left side of the right arc plate (13) is also fixedly connected with the annular rubber ring (14), and two hollow pipes (5) are respectively provided with a height adjusting mechanism (15) used for adjusting the height of the arc plate (13); the height adjusting mechanism (15) comprises latch teeth (151), clamping blocks (153) and first elastic sheets (154), the latch teeth (151) are fixedly connected to the right side of the left solid rod (7) and the left side of the right solid rod (7) at uniform intervals, a guide hole (152) for guiding is formed in the lower portion of the left side of the left hollow tube (5), the guide hole (152) is also formed in the lower portion of the right side of the right hollow tube (5), the clamping blocks (153) for clamping the latch teeth (151) are arranged in the two guide holes (152), the clamping blocks (153) are matched with the latch teeth (151), the first elastic sheets (154) are fixedly connected to the lower portion of the right side of the left hollow tube (5), the first elastic sheets (154) are fixedly connected to the lower portion of the left side of the right hollow tube (5), and the first elastic; the eye shield comprises an eye shield mechanism (16), the eye shield mechanism (16) comprises a rotating shaft (161), a friction wheel (162), a second elastic sheet (163), an arc block plate (164), friction plates (165), a connecting plate (166), a baffle plate (167), a sponge block (168) and a baffle block (169), the rotating shaft (161) is rotatably connected to the middle of the front side of an annular sleeve (1), the friction wheels (162) are fixedly connected to the left end and the right end of the rotating shaft (161), the second elastic sheet (163) is connected to the left side and the right side of the front side of the annular sleeve (1), the arc block plate (164) is fixedly connected to the front end of the second elastic sheet (163), the friction plates (165) used for increasing the friction force of the friction wheel (162) are fixedly connected to the inner side of the arc block plate (164), the friction plates (165) are in contact with the friction wheel (162), the connecting plate (166) is fixedly connected to the front side of the, sponge blocks (168) are connected to the left side and the right side of the rear side of the shielding plate (167), and shielding blocks (169) for shielding sunlight are connected to the middle of the top of the shielding plate (167); the universal joint comprises a left universal joint sleeve (10), a right universal joint sleeve (10), screw holes (17) are formed in the left side of the left universal joint sleeve (10) and the right side of the right universal joint sleeve (10), the screw rods (18) capable of moving left and right are arranged in the two screw holes (17), and the two screw rods (18) are rotatably connected with pressing blocks (19) which play a role in fixing; the rubber toothed plate fixing device is characterized by further comprising a moving sleeve (20), a second spring (21), elastic clamping rods (22), clamping hooks (23), a mounting plate (24), rubber toothed blocks (25) and rubber toothed plates (26), wherein the moving sleeve (20) capable of moving left and right is sleeved on each of the two connecting rods (12), the second spring (21) is connected between the moving sleeve (20) and the universal joint ball (11), the second spring (21) is wound on the connecting rods (12), the elastic clamping rods (22) in the shape of 7 are fixedly connected to the tops of the two connecting rods (12), the mounting plates (24) in the shape of arcs are connected to the upper and lower sides of the moving sleeve (20), the clamping hooks (23) are connected to the lower portions of the left side of the mounting plate (24) above the left side and the lower portions of the right side of the mounting plate (24) above the right side, the rubber toothed blocks (25) with a fixing effect are connected to the inner sides of the mounting plates (24) on the left side and the right side at uniform intervals, and, the rubber toothed plate (26) is matched with the rubber toothed block (25).