CN113425425A

CN113425425A - Fixing device with face supporting function for plastic cosmetology

Info

Publication number: CN113425425A
Application number: CN202110603647.3A
Authority: CN
Inventors: 郑波
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-09-24

Abstract

The invention relates to the technical field of fixing devices, in particular to a fixing device with a face supporting function for plastic cosmetology. The invention is provided with the adjusting mechanism and the supporting and fixing mechanism, and the double-rod stepping motor is used for driving the second bevel gears at two sides to rotate, so that a worker can adjust the supporting height of the face of a patient according to the requirements of different patients, the comfort level of the patient in use is greatly improved, and meanwhile, the worker can adjust the distance between the two supporting plates according to different sizes of the faces of different patients by rotating the handle, so that the supporting plates can better support and fix the faces of the patients.

Description

Fixing device with face supporting function for plastic cosmetology

Technical Field

The invention relates to the technical field of fixing devices, in particular to a fixing device with a face supporting function for plastic cosmetology.

Background

The plastic surgery refers to scientific, technical and artistic medical science which is used for repairing and remolding the appearance of a human body and the shape of each part of the human body by using operations, medicines, medical instruments and other medical technical methods so as to enhance the external aesthetic feeling of the human body, and in the plastic surgery, a fixing device is often used for fixing the face of a patient.

However, most of the existing fixing devices only fix the face and cannot fix the shoulders of the patient in an auxiliary manner, and therefore, most of the prior art adopts an auxiliary fixing mechanism to fix the shoulders of the patient in an auxiliary manner, for example, the invention disclosed as CN108652906A, the fixing device can fix the jaw reliably through an arc-shaped face fixing plate, the spring, the first sliding shaft, the sliding column, the shoulder fixing frame and the adjusting rotating wheel can be used in a matched manner to fix the shoulders of the patient in an auxiliary manner, and the second sliding shaft, the adjusting rotating plate and the threaded rod can be used in a matched manner to fix the faces quickly and conveniently, so that most of the existing fixing devices can realize the auxiliary fixing of the shoulders of the patient, but still exist, most of the existing fixing devices cannot support the faces of the patient according to the size of the faces of the patient, thereby reducing the working efficiency of workers, and most of the existing fixing devices are inconvenient for the workers to meet the needs of the patient, the supporting height of the fixing device is adjusted, so that the comfort of a patient in use is greatly reduced, and therefore, the fixing device with the face supporting function for plastic cosmetology needs to be designed to solve the problems.

Disclosure of Invention

The invention aims to provide a fixing device with a face supporting function for plastic cosmetology, which solves the problems that most of the existing fixing devices proposed in the background technology cannot support the face of a patient according to the size of the face of the patient, so that the working efficiency of workers is reduced, and meanwhile, most of the existing fixing devices are inconvenient for the workers to adjust the supporting height of the fixing device according to the requirements of the patient, so that the comfort degree of the patient in use is greatly reduced.

In order to achieve the purpose, the invention provides the following technical scheme: the fixing device with the face supporting function for the plastic cosmetology comprises a device main body, wherein the device main body comprises a base, first fixing columns are fixedly mounted on two sides of the upper end of the base, a control panel is fixedly mounted on the front side of the base, and an adjusting mechanism is arranged inside the device main body.

Preferably, the adjusting mechanism comprises a first screw rod main body, a first screw rod main body is movably mounted inside the first fixing column through a bearing, the bottom end of the first screw rod main body is movably connected with the inside of the base through a bearing, a first screw nut main body is mounted on the outer side of the first screw rod main body in a threaded manner, a first bevel gear is fixedly mounted on the outer side of the first screw rod main body, a double-rod stepping motor is fixedly mounted inside the base, rotating shafts are movably mounted on two sides of the double-rod stepping motor, a second bevel gear is fixedly mounted on one side of each rotating shaft and is in meshed connection with the first bevel gear, a supporting and fixing mechanism is arranged on the inner side of the first fixing column and comprises a first fixing plate, and a first fixing plate is fixedly mounted on one side, close to each other, of the two first screw nut main bodies, the top end of the first fixing plate is provided with a cavity, both sides of the interior of the cavity are fixedly provided with telescopic rods, the top end of each telescopic rod is fixedly provided with a placing plate, both sides of the top end of the first fixing plate are fixedly provided with connecting rods, the top end of each connecting rod is fixedly provided with a second fixing plate, the interior of each second fixing plate is movably provided with a second lead screw main body through a bearing, the threads on both sides of each second lead screw main body are opposite, both sides of each second lead screw main body are respectively provided with a second nut main body through threads, the outer side of each second lead screw main body is fixedly provided with a third bevel gear, the upper end of each third bevel gear is meshed and connected with a fourth bevel gear, the outer side of each fourth bevel gear is movably connected with the interior of the corresponding second fixing plate through a bearing, the upper end of each fourth bevel gear is fixedly provided with a handle, and the bottom end of each second nut main body is fixedly provided with a third fixing plate, two the equal fixed mounting in one side that the third fixed plate is close to each other has the fixed block, the second spout has all been seted up to one side of fixed block, the inside all slidable mounting of second spout has the second slider, the equal fixed mounting in one side of second slider has the backup pad, two the backup pad is close to each other one side and the top of placing the board all fixed mounting have the foam-rubber cushion, the upper end of fixed block all is provided with stop gear.

Preferably, two one sides that first screw main part kept away from each other are all fixed mounting have first slider, first spout has all been seted up to the inside one side of first fixed column, first slider all slidable mounting is to the inside of first spout.

Preferably, a first mounting groove is formed in one side of the first sliding block, and balls are embedded in the first mounting groove.

Preferably, the outer sides of the telescopic rods are fixedly provided with first fixing springs, and two ends of each first fixing spring are fixedly connected with the outer sides of the placing plate and the cavity respectively.

Preferably, the outer side of the handle is fixedly provided with a non-slip mat, and the non-slip mat is made of rubber.

Preferably, a second mounting groove is formed in one side of the second sliding block, and rollers are embedded in the second mounting groove.

Preferably, stop gear includes the second fixed column, the equal fixed mounting in upper end of fixed block has the second fixed column, just the quantity of second fixed column is four, the equal fixed mounting in inside of second fixed column has the second fixed spring, the equal fixed mounting in bottom of second fixed spring has the movable plate, the equal fixed mounting in bottom of movable plate has spacing post, the equal fixed mounting in upper end of movable plate has the pulling block, the equal fixed mounting in both sides of movable plate has the third slider, the third spout has all been seted up to the inside one side of second fixed column, the equal slidable mounting of third slider is to the inside of third spout.

Preferably, one side of the pulling block is hinged with a limiting plate.

Compared with the prior art, the invention has the beneficial effects that:

1. through being provided with adjustment mechanism and support fixed establishment, utilize two pole step motor to drive the second bevel gear of both sides and rotate, thereby can make first screw main part highly adjust first fixed plate, make the staff can be according to different patients 'demand, come to adjust the facial bearing height of patient, thereby comfort level when having promoted the patient greatly and using, staff's work efficiency has also been increased, utilize the staff to rotate the handle simultaneously, can make the staff can be according to the different sizes of different patient faces, come to adjust the distance between two backup pads, make the backup pad can be better support fixedly to patient's face, staff's work efficiency has further been promoted.

2. Through being provided with stop gear, utilize the inertia of second fixed spring, thereby can play spacing post to the inside of second slider, thereby with the firm inside of fixing the second slider at the second spout, the fastness of structure has been increased, the second slider has been prevented when not using, gliding phenomenon appears, the staff upwards stimulates the pulling block simultaneously, can cancel spacing to the second slider, make things convenient for the staff to dismantle and change the backup pad, staff's use experience has been promoted.

Drawings

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

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

FIG. 3 is a schematic sectional front view of a portion of the supporting and fixing mechanism of the present invention;

FIG. 4 is a schematic top view of the structure of the present invention;

FIG. 5 is a schematic side sectional view of the structure of the fixing block and the limiting mechanism of the present invention;

FIG. 6 is an enlarged view of a portion of the structure at A in FIG. 1 according to the present invention;

fig. 7 is an enlarged view of a portion of the structure at B in fig. 3 according to the present invention.

In the figure: 1. a device main body; 110. a base; 111. a first fixed column; 112. a control panel; 2. an adjustment mechanism; 210. a first lead screw body; 211. a first nut body; 212. a first bevel gear; 213. a dual-lever stepper motor; 214. a rotating shaft; 215. a second bevel gear; 216. a first slider; 217. a first chute; 218. a first mounting groove; 219. a ball bearing; 3. a supporting and fixing mechanism; 310. a first fixing plate; 311. a cavity; 312. a telescopic rod; 313. placing the plate; 314. a first fixed spring; 315. a connecting rod; 316. a second fixing plate; 317. a second lead screw body; 318. a second nut body; 319. a third bevel gear; 320. a fourth bevel gear; 321. a handle; 322. a non-slip mat; 323. a third fixing plate; 324. a fixed block; 325. a second chute; 326. a second slider; 327. a support plate; 328. a sponge cushion; 329. a second mounting groove; 330. a roller; 4. a limiting mechanism; 410. a second fixed column; 411. a second fixed spring; 412. moving the plate; 413. a limiting column; 414. pulling the block; 415. a limiting plate; 416. a third slider; 417. and a third chute.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, an embodiment of the present invention is shown:

a fixing device with a face supporting function for plastic and beauty treatment comprises a device main body 1, a double-rod stepping motor 213 used in the application is a product directly available on the market, the principle of the double-rod stepping motor is the prior art well known to those skilled in the art, and therefore the description is not repeated, the output end of a control panel 112 is electrically connected with the input end of the double-rod stepping motor 213 through a lead, the device main body 1 comprises a base 110, first fixing columns 111 are fixedly installed on both sides of the upper end of the base 110, the control panel 112 is fixedly installed on the front surface of the base 110, an adjusting mechanism 2 is arranged inside the device main body 1, the adjusting mechanism 2 comprises a first lead screw main body 210, a first lead screw main body 210 is movably installed inside the first fixing columns 111 through bearings, the bottom end of the first lead screw main body 210 is movably connected with the inside of the base 110 through bearings, a first lead screw main body 211 is installed on the outer side of the first lead screw main body 210 through threads, the outer sides of the first screw rod main bodies 210 are fixedly provided with first bevel gears 212, the inner part of the base 110 is fixedly provided with a double-rod stepping motor 213, both sides of the double-rod stepping motor 213 are movably provided with rotating shafts 214, one side of each rotating shaft 214 is fixedly provided with a second bevel gear 215, the second bevel gear 215 is meshed with the first bevel gear 212, the inner side of the first fixing column 111 is provided with a supporting and fixing mechanism 3, the supporting and fixing mechanism 3 comprises a first fixing plate 310, one side of each of the two first screw rod main bodies 211, which is close to each other, is fixedly provided with a first fixing plate 310, the top end of the first fixing plate 310 is provided with a cavity 311, both sides of the inner part of the cavity 311 are fixedly provided with telescopic rods 312, the top end of each telescopic rod 312 is fixedly provided with a placing plate 313, both sides of the top end of the first fixing plate 310 are fixedly provided with connecting rods 315, and the top end of each connecting rod 315 is fixedly provided with a second fixing plate 316, a second screw rod main body 317 is movably installed inside the second fixing plate 316 through a bearing, threads on two sides of the second screw rod main body 317 are opposite, a second screw nut main body 318 is installed on two sides of the second screw rod main body 317 through threads, a third bevel gear 319 is fixedly installed on the outer side of the second screw rod main body 317, a fourth bevel gear 320 is connected to the upper end of the third bevel gear 319 in a meshed manner, the outer side of the fourth bevel gear 320 is movably connected with the inside of the second fixing plate 316 through a bearing, a handle 321 is fixedly installed on the upper end of the fourth bevel gear 320, a third fixing plate 323 is fixedly installed at the bottom end of the second screw nut main body 318, a fixing block 324 is fixedly installed on one side of the two third fixing plates 323 close to each other, a second sliding groove 325 is formed on one side of the fixing block 324, a second sliding block 326 is slidably installed inside the second sliding groove 325, and a supporting plate 327 is fixedly installed on one side of the second sliding block 326, one side of the two supporting plates 327, which is close to each other, and the top end of the placing plate 313 are both fixedly provided with a sponge pad 328, the upper end of the fixing block 324 is provided with a limiting mechanism 4, the device main body 1 is externally connected with a power supply by a worker, and then the double-rod stepping motor 213 is started, so that the double-rod stepping motor 213 can drive the second bevel gears 215 at two sides to rotate, the second bevel gear 215 can drive the first bevel gear 212 to rotate, the first screw rod main body 210 is driven to rotate, the first screw nut main body 211 is driven to move outside the first screw rod main body 210, the height of the first fixing plate 310 can be adjusted by the first screw nut main body 211, the worker can adjust the supporting height of the face of a patient according to the requirements of different patients, the comfort level of the patient during use is greatly improved, the working efficiency of the worker is also improved, the worker rotates the handle 321, can drive second lead screw main part 317 and rotate, because the screw thread of second lead screw main part 317 both sides is opposite form to can make the backup pad 327 of both sides do and be close to the removal each other, make the staff can be according to the not equidimension of different patient faces, come to adjust the distance between two backup pads 327, make the backup pad 327 can be better support the face of patient fixedly, further promoted staff's work efficiency.

Further, two first screw main parts 211 are all fixed mounting in the one side of keeping away from each other has first slider 216, first spout 217 has all been seted up to the inside one side of first fixed column 111, first slider 216 is all slidable mounting to the inside of first spout 217, when first screw main part 211 moves in the outside of first screw main part 210, can drive first slider 216 and slide in the inside of first spout 217 to can provide stably for the removal of first screw main part 211, increase the stability of structure.

Further, a first mounting groove 218 is formed in one side of the first sliding block 216, the ball 219 is embedded in the first mounting groove 218, and when the first sliding block 216 slides, the ball 219 can roll in the first mounting groove 218, so that the first sliding block 216 can slide more smoothly in the first sliding groove 217, friction between the first sliding block 216 and the first sliding groove 217 is reduced, and abrasion of the first sliding block 216 due to sliding is reduced.

Further, the outside of telescopic link 312 is all fixed mounting has first fixed spring 314, and the both ends of first fixed spring 314 respectively with place the outside fixed connection of board 313 and cavity 311, when telescopic link 312 received the pressure that the patient was applyed, can produce the shrink to extrude first fixed spring 314, utilize the inertia of first fixed spring 314, thereby can alleviate the pressure of telescopic link 312 shrink, thereby can make that the patient places more comfortablely.

Furthermore, the outer side of the handle 321 is fixedly provided with the anti-slip pad 322, the anti-slip pad 322 is made of rubber, and the anti-slip pad 322 can increase the friction force between the handle 321 and the palm of the worker, so that the worker can better hold the handle 321 to rotate, and the physical strength of the worker is saved.

Further, a second mounting groove 329 is provided on one side of the second slider 326, the roller 330 is embedded in the second mounting groove 329, and when the second slider 326 slides in the second sliding groove 325, the roller 330 is driven to roll in the second mounting groove 329, so that the friction force applied to the second slider 326 during movement can be reduced, and the support plate 327 can be more conveniently installed in a sliding manner by a worker.

Further, the limiting mechanism 4 includes four second fixing columns 410, the upper ends of the fixing blocks 324 are fixedly mounted with the second fixing columns 410, the second fixing columns 410 are fixedly mounted with the second fixing springs 411, the bottom ends of the second fixing springs 411 are fixedly mounted with the moving plate 412, the bottom ends of the moving plate 412 are fixedly mounted with the limiting columns 413, the upper ends of the moving plate 412 are fixedly mounted with the pulling blocks 414, both sides of the moving plate 412 are fixedly mounted with the third sliding blocks 416, one side of the inner portion of the second fixing columns 410 is provided with the third sliding grooves 417, the third sliding blocks 416 are slidably mounted inside the third sliding grooves 417, and the inertia of the second fixing springs 411 is utilized to eject the limiting columns 413 into the inner portions of the second sliding blocks 326, so as to firmly fix the second sliding blocks 326 inside the second sliding grooves 325, thereby increasing the structural firmness, when not using, gliding phenomenon appears in second slider 326 having prevented, staff's pulling piece 414 that makes progress simultaneously, can cancel spacing to second slider 326, makes things convenient for the staff to dismantle and change backup pad 327, has promoted staff's use and has experienced.

Further, limiting plate 415 is all hingedly installed to one side of pulling piece 414, after staff's pulling piece 414, can overturn limiting plate 415 to make limiting plate 415 place the one end at second fixed column 410, can prevent that movable plate 412 from receiving the inertia influence of second fixed spring 411, the phenomenon of resilience appears, has made things convenient for staff's use.

The working principle is as follows: when the worker uses the device main body 1, firstly, the device main body 1 is externally connected with a power supply, and then, the worker can start to use the device main body 1, the worker can adjust the height of the first fixing plate 310 according to the height of the face of the patient, and the switch on the control panel 112 is started, so that the double-rod stepping motor 213 can be started to operate, so as to drive the rotating shafts 214 on the two sides to rotate, and the rotating shafts 214 are utilized to drive the second bevel gear 215 to rotate, because the second bevel gear 215 is meshed and connected with the first bevel gear 212, the second bevel gear 215 can drive the first bevel gear 212 to rotate, so as to drive the first lead screw main body 210 to rotate, so that the first lead screw main body 211 moves on the outer side of the first lead screw main body 210, and meanwhile, the first sliding block 216 slides in the first sliding groove 217, so as to adjust the height of the first, when the first fixing plate 310 is height-adjusted to a desired position.

The patient can place the chin in the upper end of placing board 313, the patient can exert pressure to placing board 313 simultaneously, thereby the messenger places board 313 and moves down, extrude telescopic link 312, thereby make telescopic link 312 inwards shrink and extrude first fixed spring 314, utilize the inertia of first fixed spring 314, can alleviate the pressure that the patient was applyed, subsequently the staff can be through rotating handle 321, it drives fourth bevel gear 320 and rotates to make handle 321 drive, thereby make fourth bevel gear 320 rotate and drive second lead screw main part 317 and rotate, make the second screw main part 318 of both sides do the removal of being close to each other, the third fixed plate 323 that drives both sides simultaneously is close to each other, thereby the backup pad 327 of messenger both sides is to placing the patient face on the board 313 and supporting fixedly.

When the staff need dismantle the change to backup pad 327, through upwards pulling block 414, thereby can make pulling block 414 drive movable plate 412 rebound, third slider 416 slides in the inside of third spout 417 simultaneously, make spacing post 413 break away from the inside of second slider 326, the staff can overturn limiting plate 415 afterwards, thereby make limiting plate 415 place the one end at second fixed column 410, reuse second slider 326 slides in the inside of second spout 325, can openly pull backup pad 327, take off it, change it.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A fixing device with a face supporting function for plastic beauty, comprising a device body (1), characterized in that: the device main body (1) comprises a base (110), first fixing columns (111) are fixedly mounted on two sides of the upper end of the base (110), a control panel (112) is fixedly mounted on the front face of the base (110), and an adjusting mechanism (2) is arranged inside the device main body (1).

2. A fixing device for plastic cosmetics with a face supporting function according to claim 1, characterized in that: the adjusting mechanism (2) comprises a first screw rod main body (210), a first screw rod main body (210) is movably mounted inside the first fixing column (111) through a bearing, the bottom end of the first screw rod main body (210) is movably connected with the inside of the base (110) through a bearing, a first screw nut main body (211) is mounted on the outer side of the first screw rod main body (210) in a threaded manner, a first bevel gear (212) is fixedly mounted on the outer side of the first screw rod main body (210), a double-rod stepping motor (213) is fixedly mounted inside the base (110), rotating shafts (214) are movably mounted on two sides of the double-rod stepping motor (213), a second bevel gear (215) is fixedly mounted on one side of each rotating shaft (214), the second bevel gear (215) is meshed with the first bevel gear (212), and a supporting and fixing mechanism (3) is arranged on the inner side of the first fixing column (111), the supporting and fixing mechanism (3) comprises a first fixing plate (310), a first fixing plate (310) is fixedly mounted on one side, close to each other, of two first screw main bodies (211), a cavity (311) is formed in the top end of the first fixing plate (310), telescopic rods (312) are fixedly mounted on two sides of the interior of the cavity (311), a placing plate (313) is fixedly mounted on the top end of each telescopic rod (312), connecting rods (315) are fixedly mounted on two sides of the top end of the first fixing plate (310), a second fixing plate (316) is fixedly mounted on the top end of each connecting rod (315), a second screw main body (317) is movably mounted inside the second fixing plate (316) through bearings, threads on two sides of the second screw main body (317) are opposite, and second screw main bodies (318) are mounted on two sides of the second screw main body (317) through threads, a third bevel gear (319) is fixedly mounted on the outer side of the second screw rod main body (317), a fourth bevel gear (320) is connected to the upper end of the third bevel gear (319) in a meshed manner, the outer side of the fourth bevel gear (320) is movably connected with the inside of the second fixing plate (316) through a bearing, a handle (321) is fixedly mounted at the upper end of the fourth bevel gear (320), third fixing plates (323) are fixedly mounted at the bottom ends of the second screw nut main body (318), fixing blocks (324) are fixedly mounted on the sides, close to each other, of the two third fixing plates (323), second sliding grooves (325) are formed in one sides of the fixing blocks (324), second sliding blocks (326) are slidably mounted in the second sliding grooves (325), supporting plates (327) are fixedly mounted on one sides of the second sliding blocks (326), sponge cushions (328) are fixedly mounted on the sides, close to each other, of the two supporting plates (327) and the top end of the placing plate (313), the upper ends of the fixing blocks (324) are provided with limiting mechanisms (4).

3. A fixing device for plastic cosmetics with a face supporting function according to claim 2, characterized in that: two one sides that first screw main part (211) kept away from each other all fixed mounting have first slider (216), first spout (217) have all been seted up to the inside one side of first fixed column (111), first slider (216) all slidable mounting is to the inside of first spout (217).

4. A fixing device for plastic cosmetics with a face supporting function according to claim 3, characterized in that: first mounting grooves (218) are formed in one sides of the first sliding blocks (216), and balls (219) are embedded in the first mounting grooves (218).

5. A fixing device for plastic cosmetics with a face supporting function according to claim 2, characterized in that: the outer sides of the telescopic rods (312) are fixedly provided with first fixing springs (314), and two ends of each first fixing spring (314) are fixedly connected with the outer sides of the placing plate (313) and the cavity (311) respectively.

6. A fixing device for plastic cosmetics with a face supporting function according to claim 2, characterized in that: the outer side of the handle (321) is fixedly provided with a non-slip pad (322), and the non-slip pad (322) is made of rubber.

7. A fixing device for plastic cosmetics with a face supporting function according to claim 2, characterized in that: and one side of the second sliding block (326) is provided with a second mounting groove (329), and the inside of the second mounting groove (329) is embedded with a roller (330).

8. A fixing device for plastic cosmetics with a face supporting function according to claim 2, characterized in that: the limiting mechanism (4) comprises second fixing columns (410), the upper ends of the fixing blocks (324) are fixedly provided with the second fixing columns (410), the number of the second fixing columns (410) is four, second fixing springs (411) are fixedly arranged in the second fixing columns (410), moving plates (412) are fixedly arranged at the bottom ends of the second fixing springs (411), limiting columns (413) are fixedly arranged at the bottom ends of the moving plates (412), pulling blocks (414) are fixedly arranged at the upper ends of the moving plates (412), third sliding blocks (416) are fixedly arranged on two sides of the moving plates (412), third sliding grooves (417) are formed in one side of the inner portion of the second fixing columns (410), and the third sliding blocks (416) are slidably arranged in the third sliding grooves (417).

9. A fixing device for plastic cosmetics with a face supporting function according to claim 8, characterized in that: and one side of the pulling block (414) is hinged with a limiting plate (415).