CN110353846B

CN110353846B - Traction device for exposing occlusal surface

Info

Publication number: CN110353846B
Application number: CN201910695614.9A
Authority: CN
Inventors: 廖雪妙
Original assignee: SCHOOL & HOSPITAL OF STOMATOLOGY WENZHOU MEDICAL UNIVERSITY
Current assignee: SCHOOL & HOSPITAL OF STOMATOLOGY WENZHOU MEDICAL UNIVERSITY
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2021-01-05
Anticipated expiration: 2039-07-30
Also published as: CN110353846A

Abstract

The invention discloses a traction device for exposing occlusal surfaces, which has the technical scheme that the traction device comprises a mounting plate and a lateral traction assembly, wherein the mounting plate is provided with an opening which is through in the thickness direction, the mounting plate is respectively provided with sliding grooves which are through in the thickness direction at the two sides of a cheek of a human body, the sliding grooves extend along the length direction of the mounting plate, a sliding block is arranged in the sliding grooves in a sliding manner, the lateral traction assembly is arranged at one side of the sliding block facing the face of the human body, the lateral traction assembly comprises a lantern ring, a mounting column, a first fixing piece and a plurality of drag hooks, one end of the mounting column is arranged on the sliding block, the other end of the mounting column extends back to the sliding block, the lantern ring is rotatably sleeved on the peripheral wall of the mounting column, the plurality of drag hooks are uniformly distributed along the peripheral wall of the lantern ring, each drag hook, the invention can fully expose the inside of the oral cavity of a human body and liberate both hands.

Description

Traction device for exposing occlusal surface

Technical Field

The invention relates to the field of medical instruments, in particular to a traction device for exposing a occlusal surface.

Background

In outpatient treatment in the department of stomatology, the condition of the occlusal surface or dental arch is often required to be recorded through photography, and before shooting, medical staff is often required to use a traction device to draw the corners of the mouth or the upper and lower lips of a patient so that the occlusal surface or dental arch is sufficiently exposed in the field of vision, thereby taking standard high-quality oral clinical digital photos. The drag hook is the draw gear who commonly uses among the prior art, but the drag hook needs medical personnel to hold for a long time when using, in addition, for making the inside exposure in oral cavity abundant, need use a plurality of drag hooks to pull simultaneously and handle, under medical personnel's number is only the condition alone, is difficult to pull simultaneously and the work of making a video recording.

Disclosure of Invention

In view of the disadvantages of the prior art, the present invention is directed to a traction device for exposing an occlusal surface, which can expose the inside of the oral cavity of a human body sufficiently and release both hands.

In order to achieve the purpose, the invention provides the following technical scheme: a traction device for exposing occlusal surface comprises a mounting plate and two lateral traction assemblies arranged on the mounting plate, wherein an opening through in the thickness direction is formed in the mounting plate, the opening is exposed by human lips, sliding grooves through in the thickness direction are respectively formed in the two sides, corresponding to human cheeks, of the opening of the mounting plate, the sliding grooves extend along the length direction of the mounting plate, a sliding block is arranged in each sliding groove in a sliding mode, the lateral traction assemblies are arranged on one sides, facing the human faces, of the sliding blocks, each lateral traction assembly comprises a lantern ring, a mounting column, a first fixing piece and a plurality of drag hooks, one end of the mounting column is arranged on the sliding block, the other end of the mounting column extends towards the sliding block, the lantern ring is rotatably sleeved on the peripheral wall of the mounting column, the drag hooks are uniformly distributed along the peripheral wall of the lantern ring, and, the drag hook includes handle and circular arc portion, the circular arc portion is connected in one of handle, the both ends of circular arc portion handle one side bending dorsad, this circular arc portion are the U-shaped setting, one side that the handle was kept away from to the circular arc portion is crooked to the handle, forms the circular arc groove that is used for the soft subassembly of human lip of laminating, the other end that the circular arc portion was kept away from to the handle can be dismantled and set up on the lantern ring, still is provided with drive assembly, drive assembly is used for driving the slider and removes in the inslot that slides to put into the oral cavity at two circular arc portions of drive, the circular arc face and the soft subassembly laminating back of human lip, the removal is kept away from each other to drive the slider, drives two.

As a further improvement of the invention, the first fixing piece comprises a convex block arranged on the inner wall of the sleeve ring, an annular groove is arranged on the outer peripheral wall of the mounting column, the annular groove is annularly arranged along the circumferential direction of the mounting column, the convex block is in sliding connection with the annular groove, a plurality of vertical grooves communicated with the annular groove are arranged on the outer peripheral wall of the mounting column, the vertical grooves are vertically arranged with the annular groove, and the vertical grooves are used for limiting the sleeve ring to rotate along the outer peripheral wall of the mounting column when the convex block enters the vertical grooves.

As a further improvement of the invention, a first spring is arranged in each of the two sliding grooves, one end of the first spring is connected to the inner wall of the sliding groove close to the opening side, the other end of the first spring is connected to the sliding block, the first spring is used for keeping the sliding block to move towards the opening side, the driving component is arranged on one side of the mounting plate back to the human body, the driving component comprises a mounting block, a winding drum, a handle and two guide plates, the mounting block is arranged on the mounting plate and positioned on the perpendicular bisector of the two sliding blocks, the winding drum is rotatably arranged on one side of the mounting block back to the opening, the two guide plates are respectively positioned on one side of the two sliding grooves far away from the opening and arranged on the mounting plate, two traction ropes are arranged on the outer peripheral wall of the winding drum, the two traction ropes are symmetrically arranged around the axis of the winding drum, and one end, the guide board is walked around to the other end and is kept away from open-ended one side, connects on the slider, the handle is connected and is served at the reel one of keeping away from the installation piece, the handle is used for rotating the reel, and when the reel rotated, two haulage ropes were simultaneously around on the periphery wall of reel, drive two sliders and keep away from the removal each other, and two first springs begin to extend, drive assembly is still including the second mounting that is used for locking the reel.

As a further improvement of the present invention, the second fixing member includes a plug, a holding plate, and a second spring, wherein a surface of the winding drum facing the mounting block is provided with a limiting groove circumferentially distributed around a center of the winding drum, the mounting block is provided with a mounting groove penetrating in a thickness direction, the plug is slidably connected to the mounting groove, one end of the plug away from the winding drum extends out of the mounting groove, the holding plate is located at one end of the plug extending out of the mounting groove, one end of the second spring is connected to the plug, the other end of the second spring is connected to the mounting block, and the second spring is used for keeping the plug extending into the limiting groove to lock the winding drum when the limiting groove rotates to communicate with the mounting groove.

As a further improvement of the invention, a plurality of guide rings are arranged on one surface of the guide plate, which is opposite to the opening, the guide rings are arranged along the length direction of the guide plate, and the inner rings of the guide rings are used for the traction ropes to pass through.

The invention has the beneficial effects that: by arranging the driving assembly, the soft assembly of the lip part can be pulled by the driving assembly after the pull hook is placed in the oral cavity, and compared with the prior art, the double hands of a user are liberated, so that the user can conveniently take pictures by using a photographic instrument subsequently; the lantern ring is provided with the plurality of the draw hooks and the first fixing piece, so that the two draw hooks can be used for simultaneously drawing the soft tissues of the lips, the interior of the oral cavity is more fully exposed, the draw hooks can be selected from different specifications, the draw hooks of different types are switched by rotating the lantern ring, the lantern ring can be suitable for patients with different ages, and the lantern ring is locked by the first fixing piece; the handle of drag hook can be dismantled and set up, makes things convenient for follow-up dismantlement to carry out cleaning process.

Drawings

FIG. 1 is a front view of a mounting plate;

FIG. 2 is a top view of the mounting plate;

FIG. 3 is an enlarged view of the collar, mounting post and tab of FIG. 1;

FIG. 4 is an enlarged view of a portion of FIG. 2 with the loop and retractor removed;

FIG. 5 is a rear view of the mounting plate;

FIG. 6 is an enlarged view of the spool of FIG. 5;

fig. 7 is a schematic view of a limiting groove of the winding drum.

Reference numerals: 1. mounting a plate; 10. an opening; 11. a sliding groove; 12. a slider; 13. a first spring; 2. a lateral pulling assembly; 21. a collar; 22. mounting a column; 221. an annular groove; 222. a vertical slot; 23. pulling a hook; 231. a handle; 234. a circular arc portion; 2341. a circular arc surface; 25. a first fixing member; 251. a bump; 3. a drive assembly; 31. mounting blocks; 310. mounting grooves; 32. a reel; 320. a limiting groove; 33. a handle 34, a guide plate; 341. a guide ring; 35. a hauling rope; 36. a second fixing member; 361. a bolt; 362. a hand-held plate; 363. a second spring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals.

Referring to fig. 1 to 7, the traction device for exposing the occlusal surface of the embodiment includes a mounting plate 1 and two lateral traction assemblies 2 disposed on the mounting plate 1, an opening 10 penetrating in the thickness direction is disposed on the mounting plate 1, the opening 10 is exposed by the lips of the human body, the mounting plate 1 is provided with sliding grooves 11 penetrating in the thickness direction on two sides of the opening 10 corresponding to the cheeks of the human body, the sliding grooves 11 extend along the length direction of the mounting plate 1, a sliding block 12 is slidably disposed in the sliding grooves 11, the lateral traction assemblies 2 are disposed on one side of the sliding block 12 facing the face of the human body, each lateral traction assembly 2 includes a collar 21, a mounting post 22, a first fixing member 25 and a plurality of drag hooks 23, one end of the mounting post 22 is disposed on the sliding block 12, the other end extends back to the sliding block 12, the collar 21 is rotatably sleeved on the peripheral wall of the mounting post, a plurality of the draw hooks 23 are uniformly distributed along the outer circumferential wall of the lantern ring 21, the first fixing piece 25 is used for locking the lantern ring 21, the draw hook 23 comprises a handle 231 and an arc part 234, the arc part 234 is connected with one end of the handle 231, two ends of the arc part 234 are bent back to one side of the handle 231, the arc part 234 is arranged in a U shape, one side of the arc part 234 far away from the handle 231 is bent towards the handle 231 to form an arc surface 2341 for fitting the human lip soft component, the other end of the handle 231, which is far away from the arc part 234, is detachably arranged on the collar 21, and is further provided with a driving assembly 3, the driving assembly 3 is used for driving the sliding block 12 to move in the sliding groove 11, and after the two circular arc parts 234 are driven to be arranged in the inlet cavity and the circular arc surface 2341 is attached to the soft assembly of the lip part of the human body, the driver slide 12 moves away from each other, driving the two arcs 234 to pull the lips to expose the interior of the mouth.

The embodiment can be applied to a dental chair, a connecting rod is hinged on the side wall of the dental chair, the mounting plate 1 is rotatably arranged at one end of the connecting rod far away from the dental chair, when a patient lies on the dental chair, the position of the mounting plate 1 on the connecting rod can be adjusted, the mounting plate 1 is rotated to enable the mounting plate 1 to be close to the face of the human body, the lips of the human body are exposed outside through the opening 10, the two sliding grooves 11 on the mounting plate 1 correspond to cheeks on two sides of the human body, the first fixing part 25 locks the lantern rings 21 under the initial state of the lateral traction assembly 2, one sides of the two lantern rings 21 facing the opening 10 are both provided with the draw hooks 23, the specifications of the two draw hooks 23 are the same, so as to ensure that the situations that one side is dragged to be exposed more and the other side is less when the subsequent traction is performed, after the mouth of the, the two sliders 12 are driven by the driving assembly 3 to slide in the sliding grooves 11, the arc surfaces 2341 of the two drag hooks 23 are respectively attached to soft tissues on two sides of the mouth corner, and then the two sliders 12 in the sliding grooves 11 are made to move away from each other by continuing to pass through the driving assembly 3 to drive the two arc parts 234 to simultaneously drag the lips so as to expose the inside of the mouth cavity, the mounting plate 1 is provided with a lace or an ear hook, so that the mounting plate 1 is worn on the face of a human body, the working principle is the same as above, in the embodiment, the number of the drag hooks 23 on one lantern ring 21 is two, the drag hooks 23 with different sizes and specifications can be selected to adapt to patients with different age groups, one drag hook 23 can also be selected to be used for pushing the lip plate, the mounting plate 1 rotates to the two sliding grooves 11 on the upper side and the lower side of the lips of the human body, the one end that circular arc portion 234 was kept away from to the handle in this embodiment sets up the screw hole, set up a plurality of screw rod on the periphery wall of lantern ring 21, a plurality of screw rod and a plurality of screw hole one-to-one threaded connection can show that handle 231 can dismantle the connection, and convenient follow-up cleaning and disinfecting to drag hook 23.

According to the invention, the driving assembly 3 is arranged, so that the lip soft assembly can be pulled through the driving assembly 3 after the drag hook 23 is placed in the oral cavity, compared with the prior art, the two hands of a user are liberated, and the user can conveniently take a picture by using a photographic instrument subsequently; the plurality of the draw hooks 23 and the first fixing part 25 are arranged on the lantern ring 21, so that the two draw hooks 23 can be used for simultaneously drawing the soft tissues of the lips, the interior of the oral cavity is more fully exposed, the draw hooks 23 can be selected from different specifications, the draw hooks 23 of different types are switched by rotating the lantern ring 21, the novel mouth-opening retractor is suitable for patients with different ages, and the lantern ring 21 is locked by the first fixing part 25; the handle 231 of the drag hook 23 can be detachably arranged, so that the subsequent disassembly is convenient for cleaning treatment.

As a modified specific embodiment, the first fixing member 25 includes a protrusion 251 disposed on an inner wall of the collar 21, an annular groove 221 is disposed on an outer circumferential wall of the mounting post 22, the annular groove 221 is disposed annularly along a circumferential direction of the mounting post 22, the protrusion 251 is slidably connected to the annular groove 221, a plurality of vertical grooves 222 communicating with the annular groove 221 are disposed on the outer circumferential wall of the mounting post 22, the plurality of vertical grooves 222 are disposed perpendicular to the annular groove 221, and the vertical grooves 222 are used for limiting the collar 21 from rotating along the outer circumferential wall of the mounting post 22 when the protrusion 251 enters the vertical grooves 222.

In the initial state of this embodiment, the protrusion 251 is located in the vertical slot 222, so the loop 21 cannot rotate along the outer peripheral wall of the mounting post 22, and the drag hook 23 in this embodiment can be selected from the drag hooks 23 with different specifications and sizes, and before the type of the drag hook 23 needs to be switched, the locking state of the loop 21 needs to be released, and the specific operation is as follows: the lantern ring 21 is slid along the axial direction of the mounting column 22 back to one side of the mounting plate 1, the bump 251 on the inner wall of the lantern ring 21 moves into the annular groove 221 along one vertical groove 222, when the bump 251 is positioned in the annular groove 221, the lantern ring 21 can automatically rotate, a user rotates the draw hook 23 to be used to one side close to the opening 10, the draw hook 23 is conveniently placed into an oral cavity subsequently, then the lantern ring 21 is slid along the axial direction of the mounting column 22 to one side of the mounting plate 1, so that the bump 251 is positioned in a new vertical groove 222 again, at the moment, the lantern ring 21 is locked again, the number of the vertical grooves 222 is the same as or larger than that of the draw hooks 23 on the lantern ring 21, when the lantern ring 21 is locked again, the bump 251 can always move into the next different vertical groove 222, the first fixing piece 25 in the invention has a simple structure and is convenient to operate, and in the adjusting process, the collar 21 is not disengaged from the mounting post 22 at all times so that the collar 21 is not easily lost.

As a modified specific embodiment, two of the sliding grooves 11 are respectively provided with a first spring 13, one end of the first spring 13 is connected to the inner wall of the sliding groove 11 near the opening 10 side, the other end of the first spring 13 is connected to the slider 12, the first spring 13 is used for keeping the slider 12 moving to the opening 10 side, the driving component 3 is arranged on the side of the mounting plate 1 facing away from the human body, the driving component 3 comprises a mounting block 31, a winding drum 32, a handle 33 and two guide plates 34, the mounting block 31 is arranged on the mounting plate 1 and located on the perpendicular bisector of the two sliders 12, the winding drum 32 is rotatably arranged on the side of the mounting block 31 facing away from the opening 10, the two guide plates 34 are respectively located on the side of the two sliding grooves 11 away from the opening 10 and arranged on the mounting plate 1, the outer peripheral wall of the winding drum 32 is provided with two traction ropes 35, two haulage ropes 35 are the symmetry setting with the axle center of reel 32, the one end of haulage rope 35 is connected on the periphery wall, and the other end is walked around guide plate 34 and is kept away from one side of opening 10, connects on slider 12, handle 33 is connected and is served at the reel 32 one of keeping away from installation piece 31, handle 33 is used for rotating reel 32, and when reel 32 rotated, two haulage ropes 35 were simultaneously around on the periphery wall of reel 32, drove two sliders 12 and keep away from the removal each other, and two first springs 13 begin to extend, drive assembly 3 still includes second mounting 36 that is used for locking reel 32.

In the present embodiment, in the initial state, two pulling ropes 35 are connected to two sides of the winding drum 32 close to the two guiding plates 34, in order to ensure that the winding drum 32 is rotated subsequently, when the pulling ropes 35 are wound on the winding drum 32, the sliding block 12 can be driven to slide away from one side of the opening 10, so that the two guiding plates 34 are arranged on one side of the sliding slot 11 away from the opening 10, one end of the pulling rope 35 is connected to the winding drum 32, and the other end of the pulling rope 35 bypasses one side of the guiding plate 34 away from the opening 10, and is connected to the sliding block 12, in order to prevent the pulling rope 35 from disengaging from the guiding plates 34, a guiding slot can be arranged on one side of the guiding plate 34 away from the opening 10, the pulling rope 35 is embedded into the guiding slot, after the locking state of the second fixing element 36 to the winding drum 32 is released, the user can, the soft tissue of drive drag hook 23 tractive lip, two first springs 13 begin to stretch, after the oral cavity inside exposes fully, accessible second mounting 36 locks reel 32, when needs remove the drag hook 23 and to the flexible subassembly of lip's tractive, remove the locking state of reel 32 through second mounting 36 again, and first spring 13 begins the compression, drives two sliders 12 and is close to each other and removes, returns to initial position.

According to the invention, the driving assembly 3 and the first spring 13 are arranged, the first spring 13 has the driving force for keeping the sliding block 12 to slide towards one side of the opening 10, so that the two drag hooks 23 positioned at one side of the two winding drums 32 close to each other are arranged close to the opening 10, a user can conveniently place the drag hooks 23 in the oral cavity of a patient, and then the driving assembly 3 drives the sliding block 12 to slide so as to drive the two drag hooks 23 to drag the soft tissue of the lip.

As a modified specific embodiment, the second fixing element 36 includes a bolt 361, a holding plate 362, and a second spring 363, a limiting groove 320 circumferentially distributed around a center of the winding drum 32 is disposed on a surface of the winding drum 32 facing the mounting block 31, a mounting groove 310 penetrating in a thickness direction is disposed on the mounting block 31, the bolt 361 is slidably connected to the mounting groove 310, one end of the bolt 361 away from the winding drum 32 extends out of the mounting groove 310, the holding plate 362 is located at one end of the bolt 361 extending out of the mounting groove 310, one end of the second spring 363 is connected to the bolt 361, the other end of the second spring 363 is connected to the mounting block 31, and the second spring 363 is used for keeping the bolt 361 extending into the limiting groove 320 to lock the winding drum 32 when the limiting groove 320 rotates to communicate with the mounting groove 310.

In the embodiment, in an initial state, the plug 361 is located in the mounting groove 310 and one of the limiting grooves 320, the winding drum 32 is in a locked state, when the winding drum 32 needs to be rotated, the hand-holding plate 362 is manually moved to make the plug 361 separate from the limiting groove 320, the second spring 363 starts to extend, the winding drum 32 can freely rotate at the moment, the winding drum 32 is rotated for a plurality of turns by rotating the handle 33, after the drag hook 23 sufficiently exposes the inside of the oral cavity, when the winding drum 32 needs to be re-locked, the hand-holding plate 362 can be loosened to start to shorten by the second spring 363, the plug 361 is inserted into the next limiting groove 320, the winding drum 32 is in the locked state again, the winding drum 32 is locked, namely, the position of the sliding block 12 is not easily changed even under the pulling force of the pulling rope 35 and the elastic force of the spring, the second fixing member 36 in the present invention has a simple structure and is convenient to, can keep a static state, and a user can determine the degree of dragging soft lip tissues according to actual requirements.

As a modified specific embodiment, a plurality of guide rings 341 are disposed on a surface of the guide plate 34 facing away from the opening 10, the plurality of guide rings 341 are disposed along a length direction of the guide plate 34, and inner rings of the plurality of guide rings 341 are used for the pull rope 35 to pass through.

The outer wall and the guide board 34 fixed connection of guide ring 341 in this implementation, haulage rope 35 pass the inner circle of a plurality of guide ring 341 in proper order, through above-mentioned technical scheme for haulage rope 35 is difficult for the in-process at the rolling to drop guide board 34, makes the rolling process stable.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A pulling device for occlusal exposure, comprising: including mounting panel (1) and setting up two side direction tractive subassemblies (2) on mounting panel (1), be provided with opening (10) that thickness direction link up on mounting panel (1), opening (10) expose with human lip, mounting panel (1) is provided with slide groove (11) that thickness direction link up respectively in opening (10) correspondence human cheek both sides, slide groove (11) extend the setting along the length direction of mounting panel (1), it is provided with slider (12) to slide in slide groove (11), side direction tractive subassembly (2) set up in slider (12) towards one side of human face, side direction tractive subassembly (2) include lantern ring (21), erection column (22), first mounting (25) and a plurality of drag hook (23), erection column (22) one end sets up on slider (12), and the other end extends slider (12) dorsad, the lantern ring (21) rotates the cover and establishes on the periphery wall of erection column (22), a plurality of draw hook (23) is along the periphery wall evenly distributed setting of lantern ring (21), first mounting (25) are used for locking lantern ring (21), draw hook (23) include handle (231) and circular arc portion (234), circular arc portion (234) are connected in one of handle (231) and are served, the both ends of circular arc portion (234) are handle (231) one side bending dorsad, and this circular arc portion (234) are the U-shaped setting, one side that handle (231) were kept away from to circular arc portion (234) is crooked to handle (231), forms the circular arc groove that is used for laminating human lip soft subassembly, the other end that circular arc portion (234) was kept away from to handle (231) can be dismantled the setting on lantern ring (21), still is provided with drive assembly (3), drive assembly (3) are used for drive slider (12) to move in groove (11) that slides, the two arc parts (234) are driven to be placed in the oral cavity, after the arc surface (2341) is attached to the soft lip component of the human body, the sliding blocks (12) are driven to move away from each other, the two arc parts (234) are driven to pull the lip to expose the inside of the oral cavity,

first mounting (25) are including setting up lug (251) on the inner wall of lantern ring (21), be provided with ring channel (221) on the periphery wall on erection column (22), ring channel (221) are the annular setting along the circumferencial direction of erection column (22), lug (251) and ring channel (221) sliding connection, be provided with a plurality of on the periphery wall of erection column (22) and the communicating perpendicular groove (222) of ring channel (221), a plurality of perpendicular groove (222) set up with ring channel (221) is perpendicular, perpendicular groove (222) are used for lug (251) to get into when erecting groove (222), and restriction lantern ring (21) are rotated along erection column (22) periphery wall.

2. The apparatus as claimed in claim 1, wherein the pulling means for exposing the occlusal surface comprises: two first springs (13) are arranged in the sliding grooves (11), one end of each first spring (13) is connected to the inner wall, close to one side of the opening (10), of each sliding groove (11), the other end of each first spring (13) is connected to the corresponding sliding block (12), each first spring (13) is used for keeping the corresponding sliding block (12) to move towards one side of the opening (10), the driving assembly (3) is arranged on one face, back to the human body, of the mounting plate (1), the driving assembly (3) comprises a mounting block (31), a winding drum (32), a handle (33) and two guide plates (34), the mounting block (31) is arranged on the mounting plate (1) and located on the perpendicular bisector of the two sliding blocks (12), the winding drum (32) is rotatably arranged on one face, back to the opening (10), of the mounting block (31), the two guide plates (34) are respectively located on one side, far away from the opening (10), of the two sliding grooves (11) and are arranged on the mounting plate (, be provided with two haulage rope (35) on the periphery wall of reel (32), two haulage rope (35) are the symmetry setting with the axle center of reel (32), the one end of haulage rope (35) is connected on the periphery wall, and the other end is walked around guide board (34) and is kept away from one side of opening (10), connects on slider (12), handle (33) are connected and are kept away from one of installation piece (31) in reel (32) and serve, handle (33) are used for rotating reel (32), and when reel (32) rotated, two haulage rope (35) were simultaneously around on the periphery wall of reel (32), drive two sliders (12) and keep away from the removal each other, and two first spring (13) begin to extend, drive assembly (3) still include second mounting (36) that are used for locking reel (32).

3. The pulling device for exposing an occlusal surface as claimed in claim 2, wherein: the second fixing piece (36) comprises a bolt (361), a hand-held plate (362) and a second spring (363), one surface of the winding drum (32) facing the mounting block (31) is provided with limit grooves (320) which are distributed circumferentially by the circle center of the winding drum (32), the mounting block (31) is provided with a mounting groove (310) which is through in the thickness direction, the bolt (361) is connected with the mounting groove (310) in a sliding way, one end of the bolt (361) far away from the winding drum (32) extends out of the mounting groove (310), the holding plate (362) is positioned at one end of the bolt (361) extending out of the mounting groove (310), one end of the second spring (363) is connected to the bolt (361), the other end is connected to the mounting block (31), the second spring (363) is used for limiting the rotation of the groove (320) to be communicated with the mounting groove (310), the holding bolt (361) extends into the limiting groove (320) to lock the winding drum (32).

4. The pulling device for exposing an occlusal surface as claimed in claim 2, wherein: the guide plate (34) is provided with a plurality of guide rings (341) on the surface back to the opening (10), the guide rings (341) are arranged along the length direction of the guide plate (34), and the inner ring of each guide ring (341) is used for the traction rope (35) to pass through.