CN113426070A

CN113426070A - Ligament tractive device for track and field training

Info

Publication number: CN113426070A
Application number: CN202110658628.0A
Authority: CN
Inventors: 李亮
Original assignee: Individual
Current assignee: Lanxi Olympic Games Equipment Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2021-09-24
Anticipated expiration: 2041-06-15
Also published as: CN113426070B

Abstract

The invention discloses a ligament traction device for track and field training, relates to the technical field of track and field training, and solves the problems that the currently used ligament traction device is mainly used for fixing a leg through a leg fixing structure and then expanding the leg, is mainly used for the leg, has large bearing capacity and does not have a ligament traction structure convenient for whole body expansion. A ligament traction device for track and field training comprises a base; two groups of leg seats are integrally arranged on two sides of the rear end of the base, and lead screws are rotatably arranged on the adjacent sides of the two groups of leg seats; the top of the base and the top of the leg seat are fixedly provided with top plates; the base internal fixation is provided with two sets of capable motors in advance, and the fixed interior ratchet gear A that is provided with of capable motor shaft end in advance, through being provided with the curb plate, for the ligament tractive provides convenience, can lift the leg earlier fast through two kinds of atress modes and further slowly stretch to ligament atress position, the ligament structure of pulling of the whole body extension of being convenient for has improved tensile efficiency, can be directed against single leg quick stretching.

Description

Ligament tractive device for track and field training

Technical Field

The invention relates to the technical field of track and field training, in particular to a ligament traction device for track and field training.

Background

Track and field need carry out the tractive training to shank ligament when training, consequently need use ligament tractive device to assist, draw the ligament and be a form of heating up in fact, will stretch out the muscle before the strenuous activity to prevent to make the ligament bearing capacity not live suddenly with higher speed, injury or fracture, ligament pull wound. The bearing capacity of the body bending degree and the extending capacity of each limb are improved by pulling the ligament.

For example, patent through retrieval for patent number CN211935397U discloses a ligament draw-off gear for track and field training relates to sports training technical field, specifically is a ligament draw-off gear for track and field training, the on-line screen storage device comprises a base, the top fixed mounting of base has the slide rail, the top sliding connection of slide rail has the hoop foot body, the one end fixed mounting of base has the cushion, the hoop foot body is close to one side fixedly connected with leg fagging of cushion, the middle part fixedly connected with connecting rod of leg fagging one side is kept away from to the hoop foot body, reset spring has been cup jointed to the outside of connecting rod. This ligament draw-off device for track and field training through the hoop foot body and slide rail sliding connection for can bend and stretch after sportsman's both legs are placed on the hoop foot body, thereby reach the purpose of tensile shank ligament, and pedal the combined action of piece and the hoop foot body through the heel, make sportsman's heel and preceding sole can incline more, improved the tensile effect of ligament.

For another example patent No. CN210904844U discloses a ligament draw gear for track and field training, relates to trainer technical field, specifically is a ligament draw gear for track and field training, including the mobile jib, the groove of accomodating has all been seted up to the both sides of mobile jib, the fixed surface of mobile jib installs the cushion. This ligament tractive device is used in track and field training, through setting up running-board and shank standing groove, utilize the running-board to assist the foot of training person and place, utilize the shank standing groove to place training person's shank simultaneously, make this ligament tractive device is used in track and field training can sit or lie prone and carry out ligament tractive training, the problem of traditional track and field training with ligament tractive device training mode singleness has been avoided, this ligament tractive device is used in track and field training's practicality has been improved, utilize the main pole to cup joint the spliced pole simultaneously, be convenient for receiving this ligament tractive device is used in track and field training.

However, the currently used ligament traction device mainly fixes and then unfolds the leg through the leg fixing structure, the stress is mainly applied to the leg, the bearing force is large, the ligament traction device does not have a ligament pulling structure convenient for unfolding the whole body, does not have an unfolding function aiming at rapid stretching of a single leg, and is not beneficial to rapid traction, so that the existing requirement is not met, and the ligament traction device for field and field training is provided.

Disclosure of Invention

Problem (A)

The invention aims to provide a ligament traction device for track and field training, and aims to solve the problems that the currently used ligament traction device in the background art mainly fixes and unfolds a leg part through a leg part fixing structure, is mainly applied to the leg part, bears larger force, does not have a ligament pulling structure convenient for unfolding the whole body, does not have an unfolding function aiming at rapid stretching of a single leg, and is not beneficial to rapid traction.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a ligament traction device for track and field training comprises a base; two groups of leg seats are integrally arranged on two sides of the rear end of the base, and lead screws are rotatably arranged on the adjacent sides of the two groups of leg seats; the top of the base and the top of the leg seat are fixedly provided with top plates; two groups of pre-running motors are fixedly arranged in the base, and an inner ratchet wheel gear A is fixedly arranged at the shaft end of each pre-running motor; the middle of each leg seat is rotatably provided with a side shaft, and the outer ends of the side shafts are fixedly provided with inner ratchet gears B; the sliding frames are fixedly arranged on two sides of the base, and the front side of the top of each sliding frame is integrally provided with an extending structure; two groups of motor switches are fixedly arranged on two sides of the top of the base.

Preferably, the top plate further comprises a leg plate, a side plate, a hand sliding groove and an L-shaped sliding groove; two groups of leg plates are rotatably arranged in the middle of the rear side of the top plate through hinge connection, side plates are uniformly arranged on two sides of each leg plate, and a binding band is arranged at the top of each side plate; both sides of the top plate are provided with hand sliding grooves; four groups of L-shaped sliding grooves are formed in two sides of the top of each side plate, and the two adjacent groups of L-shaped sliding grooves are symmetrical in shape.

Preferably, the top plate further comprises a rack slot, a one-way rack and a slot; rack grooves are formed in the middle of the tops of the two groups of L-shaped sliding grooves on the right side, and one-way racks are fixedly arranged in the rack grooves; the top end of the rear side of the rack slot is provided with an inserting slot; the tops of the two groups of L-shaped sliding grooves on the left side are provided with an L-shaped shoulder frame B in a sliding manner, and the tops of the two groups of L-shaped sliding grooves on the right side are provided with an L-shaped shoulder frame A in a sliding manner.

Preferably, the screw rod further comprises a nut block, a connecting rod and a transmission gear; the outer side of the screw rod is rotatably provided with a nut block through threaded connection, and the nut block is arranged on the inner side of the leg seat in a sliding manner; the inner end of the nut block is rotatably provided with a connecting rod through hinge connection; a transmission gear is fixedly arranged at the rear end of the screw rod, and the bottom of the inner ratchet gear A is meshed with the top of the transmission gear; the side shaft is in transmission connection with a lead screw provided with a bevel gear.

Preferably, the sliding frame further comprises a sliding rack and a spring rod A; sliding racks are arranged on the inner sides of the bottoms of the sliding frames in a sliding mode, corner structures are integrally arranged on the tops of the front ends of the sliding racks, the tops of the corner structures are arranged in the hand sliding grooves in a sliding mode, and handles are fixedly arranged on the tops of the corner structures; the rear side of the sliding rack corner structure is fixedly provided with a spring rod A, and the spring rod A is sleeved with a spring and penetrates through the sliding frame to be connected with the sliding frame in a sliding mode.

Preferably, the L-shaped shoulder frame A further comprises a vertical groove, a hand wheel shaft, a lifting gear, a spring block, a spring rod B, a lifting block and a lifting rack; a vertical groove is vertically formed in the middle of the L-shaped shoulder frame A, and a spring block is fixedly arranged on the lower side inside the vertical groove; a hand wheel shaft penetrates through the vertical groove in the middle of the top of the L-shaped shoulder frame A and is rotatably arranged, and a hand wheel is fixedly arranged at the rear end of the hand wheel shaft; a spring rod B is arranged in the spring block in a sliding manner, a lifting block is fixedly arranged at the top of the spring rod B, and a lifting rack is fixedly arranged at the top of the lifting block; the outside of hand wheel axle is fixed and is provided with the lifting gear, and lifting gear and promotion rack meshing.

Preferably, the L-shaped shoulder rack A further comprises a one-way clamping block and a cutting; the bottom of the spring rod B is fixedly provided with a one-way clamping block, the bottom of the one-way clamping block can be attached to the top of the one-way rack, and the one-way clamping block and the one-way rack form a self-locking mechanism for limiting the L-shaped shoulder rack A to move backwards only; the bottom of the rear side of the L-shaped shoulder frame A is fixedly provided with an inserting strip, and the inserting strip is arranged in the slot in a sliding mode.

Preferably, the front sides of the bottoms of the L-shaped shoulder frames A and B are integrally provided with extension structures, the tops of the extension structures of the L-shaped shoulder frames A and B are fixedly provided with pillow plates, the tops of the pillow plates are fixedly provided with cotton pillows, and the rear sides of the cotton pillows are provided with hemispherical grooves.

(III) advantageous effects

The invention provides a ligament traction device for track and field training, which provides convenience for ligament traction by arranging a side plate, wherein a pre-moving motor drives a transmission gear to rotate through an inner ratchet gear A, the transmission gear drives a lead screw to rotate, the lead screw drives a nut block to move forwards, the nut block, a connecting rod and a leg plate form a sliding block mechanism, the leg plate is rotated upwards to lift the leg part upwards to further realize the stretching function, the pre-moving motor is stopped when the leg plate rotates to the position where the ligament of the leg part is stressed, a sliding rack is manually pushed and pulled, the sliding rack drives an inner ratchet gear B to rotate, the inner ratchet gear B drives a side shaft to rotate, the side shaft drives the lead screw to rotate through a bevel gear to further continue to rotate the leg plate to perform slow-speed stretching, the leg can be quickly lifted to the position where the ligament is stressed to further perform slow-speed stretching through two stress modes, and the whole body can be conveniently stretched, the stretching efficiency is improved, and the single leg can be rapidly stretched.

Secondly, the L-shaped shoulder frame A and the L-shaped shoulder frame B are arranged to provide a shoulder limiting function for the traction device, when the L-shaped shoulder frame A and the L-shaped shoulder frame B need to be loosened, the hand wheel shaft is rotated and drives the lifting gear to rotate, the lifting rack and the spring rod B are lifted upwards by the lifting gear, the unidirectional fixture block is lifted, the L-shaped shoulder frame A is unlocked, and then the positions of the L-shaped shoulder frame A and the L-shaped shoulder frame B can be adjusted.

Drawings

FIG. 1 is a schematic perspective rear view structure in an embodiment of the present invention;

FIG. 2 is a schematic perspective front view of an embodiment of the present invention;

FIG. 3 is a schematic bottom view of an embodiment of the present invention;

FIG. 4 is a partial cross-sectional structural schematic view of an embodiment of the present invention;

FIG. 5 is a side cross-sectional structural schematic view of an embodiment of the present invention;

FIG. 6 is an enlarged partial structural view of part A in the embodiment of the present invention;

FIG. 7 is an enlarged partial structural view of a portion B in the embodiment of the present invention;

FIG. 8 is an enlarged view of a portion C according to an embodiment of the present invention;

in fig. 1 to 8, the correspondence between the part names or lines and the reference numbers is:

1. a base; 101. a leg base; 2. a top plate; 201. a leg plate; 202. a side plate; 203. a hand chute; 204. an L-shaped chute; 205. a rack slot; 206. a unidirectional rack; 207. a slot; 3. a lead screw; 301. a nut block; 302. a connecting rod; 303. a transmission gear; 4. a pre-travel motor; 5. an inner ratchet wheel gear A; 6. a side shaft; 601. an inner ratchet gear B; 7. a carriage; 701. a sliding rack; 702. a spring rod A; 8. a motor switch; 9. an L-shaped shoulder frame A; 901. a vertical slot; 902. a hand wheel shaft; 903. a lifting gear; 904. a spring block; 905. a spring rod B; 906. a lifting block; 907. lifting the rack; 908. a one-way clamping block; 909. cutting; 10. an L-shaped shoulder frame B; 11. a pillow plate; 12. a cotton pillow.

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.

Referring to fig. 1 to 8, an embodiment of the present invention includes: a ligament traction device for track and field training comprises a base 1; two sets of leg seats 101 are integrally arranged on two sides of the rear end of the base 1, and lead screws 3 are rotatably arranged on the adjacent sides of the two sets of leg seats 101; the top of the base 1 and the leg seat 101 is fixedly provided with a top plate 2; the top plate 2 also comprises a leg plate 201, a side plate 202, a hand sliding groove 203 and an L-shaped sliding groove 204; two groups of leg plates 201 are rotatably arranged in the middle of the rear side of the top plate 2 through hinge connection, side plates 202 are uniformly arranged on two sides of each leg plate 201, and a binding band is arranged at the top of each side plate 202; both sides of the top plate 2 are provided with hand sliding grooves 203; two sides of the top of the side plate 202 are provided with four groups of L-shaped sliding grooves 204, and two adjacent groups of L-shaped sliding grooves 204 are symmetrical in shape; the top plate 2 further comprises a rack groove 205, a one-way rack 206 and a slot 207; rack grooves 205 are formed in the middle of the tops of the two groups of L-shaped sliding grooves 204 on the right side, and one-way racks 206 are fixedly arranged in the rack grooves 205; the top end of the rear side of the rack groove 205 is provided with a slot 207; the tops of the two groups of L-shaped sliding grooves 204 on the left side are provided with L-shaped shoulder racks B10 in a sliding manner, and the tops of the two groups of L-shaped sliding grooves 204 on the right side are provided with L-shaped shoulder racks A9 in a sliding manner; the screw rod 3 further comprises a nut block 301, a connecting rod 302 and a transmission gear 303; the outer side of the screw rod 3 is rotatably provided with a nut block 301 through threaded connection, and the nut block 301 is arranged on the inner side of the leg seat 101 in a sliding manner; the inner end of the nut block 301 is rotatably provided with a connecting rod 302 through hinge connection; a transmission gear 303 is fixedly arranged at the rear end of the screw rod 3, and the bottom of an inner ratchet gear A5 is meshed with the top of the transmission gear 303; two groups of pre-running motors 4 are fixedly arranged in the base 1, and inner ratchet gears A5 are fixedly arranged at the shaft ends of the pre-running motors 4; the middle of the leg seat 101 is rotatably provided with a side shaft 6, and the outer ends of the side shafts 6 are fixedly provided with inner ratchet gears B601; the two sides of the base 1 are both fixedly provided with a sliding frame 7, and the front side of the top of the sliding frame 7 is integrally provided with an extension structure; the sliding frame 7 also comprises a sliding rack 701 and a spring rod A702; sliding racks 701 are arranged on the inner sides of the bottoms of the sliding frames 7 in a sliding mode, corner structures are integrally arranged on the tops of the front ends of the sliding racks 701, the tops of the corner structures are arranged in the hand sliding grooves 203 in a sliding mode, and handles are fixedly arranged on the tops of the corner structures; spring rods A702 are fixedly arranged on the rear sides of the corner structures of the sliding rack 701, and the spring rods A702 are sleeved with springs and penetrate through the sliding frame 7 to be connected with the sliding frame 7 in a sliding mode; two groups of motor switches 8 are fixedly arranged on two sides of the top of the base 1; the L-shaped shoulder rack A9 further comprises a vertical groove 901, a hand wheel shaft 902, a lifting gear 903, a spring block 904, a spring rod B905, a lifting block 906 and a lifting rack 907; a vertical groove 901 is vertically formed in the middle of the L-shaped shoulder frame A9, and a spring block 904 is fixedly arranged on the lower side inside the vertical groove 901; a hand wheel shaft 902 is rotatably arranged in the middle of the top of the L-shaped shoulder frame A9 through a vertical groove 901, and a hand wheel is fixedly arranged at the rear end of the hand wheel shaft 902; a spring rod B905 is arranged in the spring block 904 in a sliding mode, a lifting block 906 is fixedly arranged at the top of the spring rod B905, and a lifting rack 907 is fixedly arranged at the top of the lifting block 906; a lifting gear 903 is fixedly arranged on the outer side of the hand wheel shaft 902, and the lifting gear 903 is meshed with a lifting rack 907.

Wherein, the L-shaped shoulder rack A9 also comprises a one-way latch 908 and a plunger 909; the bottom of the spring rod B905 is fixedly provided with a one-way latch 908, the bottom of the one-way latch 908 can be attached to the top of the one-way rack 206, and the one-way latch 908 and the one-way rack 206 form a self-locking mechanism for limiting the L-shaped shoulder rack A9 to move backwards only; the back bottom of the L-shaped shoulder frame a9 is fixedly provided with a plunger 909, and the plunger 909 is slidably disposed in the slot 207.

The front sides of the bottoms of the L-shaped shoulder frame A9 and the L-shaped shoulder frame B10 are integrally provided with an extension structure, the top of the extension structure of the L-shaped shoulder frame A9 and the L-shaped shoulder frame B10 is fixedly provided with a pillow plate 11, the top of the pillow plate 11 is fixedly provided with a cotton pillow 12, and the rear side of the cotton pillow 12 is provided with a hemispherical groove.

The working principle is as follows: during use, a trainer lies on the top of the base 1, places two legs on the tops of the two sets of leg plates 201, fixes the legs of the trainer by using the binding bands on the tops of the side plates 202 to complete the pre-work, then lies down, pulls the L-shaped shoulder frames A9 and B10 backwards, and fixes the shoulders of the trainer by using the L-shaped shoulder frames A9 and B10.

The pre-moving motor 4 is started through the motor switch 8, the pre-moving motor 4 drives the transmission gear 303 to rotate through the inner ratchet gear A5, the transmission gear 303 drives the lead screw 3 to rotate, the lead screw 3 drives the nut block 301 to move forwards, the nut block 301, the connecting rod 302 and the leg plate 201 form a sliding block mechanism, the leg plate 201 rotates upwards and turns up, the leg is lifted upwards, the stretching function is further achieved, the pre-moving motor 4 is stopped when the leg plate 201 rotates to the position where the leg ligament is stressed, the sliding rack 701 is pushed and pulled manually, the sliding rack 701 drives the inner ratchet gear B601 to rotate, the inner ratchet gear B601 drives the side shaft 6 to rotate, the side shaft 6 drives the lead screw 3 to rotate through the bevel gear, the leg plate 201 continues to rotate, and slow-speed stretching is achieved.

When the L-shaped shoulder rack A9 and the L-shaped shoulder rack B10 need to be loosened, the hand wheel shaft 902 is rotated, the hand wheel shaft 902 drives the lifting gear 903 to rotate, the lifting gear 903 is used for lifting the lifting rack 907 and the spring rod B905 upwards, the one-way clamping block 908 is lifted, the L-shaped shoulder rack A9 is unlocked, and the positions of the L-shaped shoulder rack A9 and the L-shaped shoulder rack B10 can be adjusted.

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. The utility model provides a ligament draw gear for track and field training which characterized in that: comprises a base (1); two groups of leg seats (101) are integrally arranged on two sides of the rear end of the base (1), and lead screws (3) are rotatably arranged on the adjacent sides of the two groups of leg seats (101); the top of the base (1) and the top of the leg seat (101) are fixedly provided with a top plate (2); two groups of pre-running motors (4) are fixedly arranged in the base (1), and inner ratchet gears A (5) are fixedly arranged at the shaft ends of the pre-running motors (4); the middle of the leg seat (101) is rotatably provided with a side shaft (6), and the outer end of the side shaft (6) is fixedly provided with an inner ratchet gear B (601); the two sides of the base (1) are both fixedly provided with a sliding frame (7), and the front side of the top of the sliding frame (7) is integrally provided with an extension structure; two groups of motor switches (8) are fixedly arranged on two sides of the top of the base (1).

2. The ligament pulling device for track and field training of claim 1, wherein: the top plate (2) also comprises a leg plate (201), a side plate (202), a hand sliding groove (203) and an L-shaped sliding groove (204); the middle of the rear side of the top plate (2) is rotatably provided with two groups of leg plates (201) through hinge connection, the two sides of each leg plate (201) are uniformly provided with side plates (202), and the tops of the side plates (202) are provided with binding bands; both sides of the top plate (2) are provided with hand sliding grooves (203); four groups of L-shaped sliding grooves (204) are formed in two sides of the top of the side plate (202), and two adjacent groups of L-shaped sliding grooves (204) are symmetrical in shape.

3. The ligament pulling device for track and field training of claim 1, wherein: the top plate (2) further comprises a rack groove (205), a one-way rack (206) and a slot (207); rack grooves (205) are formed in the middle of the tops of the two groups of L-shaped sliding grooves (204) on the right side, and one-way racks (206) are fixedly arranged in the rack grooves (205); the top end of the rear side of the rack groove (205) is provided with a slot (207); the tops of the two groups of L-shaped sliding grooves (204) on the left side are provided with L-shaped shoulder frames B (10) in a sliding manner, and the tops of the two groups of L-shaped sliding grooves (204) on the right side are provided with L-shaped shoulder frames A (9) in a sliding manner.

4. The ligament pulling device for track and field training of claim 1, wherein: the lead screw (3) further comprises a nut block (301), a connecting rod (302) and a transmission gear (303); the outer side of the screw rod (3) is rotatably provided with a nut block (301) through threaded connection, and the nut block (301) is arranged on the inner side of the leg seat (101) in a sliding manner; the inner end of the nut block (301) is rotatably provided with a connecting rod (302) through hinged connection; a transmission gear (303) is fixedly arranged at the rear end of the screw rod (3), and the bottom of the inner ratchet gear A (5) is meshed with the top of the transmission gear (303); the side shaft (6) is in transmission connection with the lead screw (3) through a bevel gear.

5. The ligament pulling device for track and field training of claim 1, wherein: the sliding frame (7) further comprises a sliding rack (701) and a spring rod A (702); sliding racks (701) are arranged on the inner sides of the bottoms of the sliding frames (7) in a sliding mode, corner structures are integrally arranged on the tops of the front ends of the sliding racks (701), the tops of the corner structures are arranged in the hand sliding grooves (203) in a sliding mode, and handles are fixedly arranged on the tops of the corner structures; spring rods A (702) are fixedly arranged on the rear sides of the corner structures of the sliding racks (701), and the spring rods A (702) are sleeved with springs and penetrate through the sliding frame (7) to be in sliding connection with the sliding frame (7).

6. The ligament pulling device for track and field training of claim 3, wherein: the L-shaped shoulder frame A (9) further comprises a vertical groove (901), a hand wheel shaft (902), a lifting gear (903), a spring block (904), a spring rod B (905), a lifting block (906) and a lifting rack (907); a vertical groove (901) is vertically formed in the middle of the L-shaped shoulder frame A (9), and a spring block (904) is fixedly arranged on the lower side inside the vertical groove (901); a hand wheel shaft (902) is rotatably arranged in the middle of the top of the L-shaped shoulder frame A (9) through a vertical groove (901), and a hand wheel is fixedly arranged at the rear end of the hand wheel shaft (902); a spring rod B (905) is arranged in the spring block (904) in a sliding mode, a lifting block (906) is fixedly arranged at the top of the spring rod B (905), and a lifting rack (907) is fixedly arranged at the top of the lifting block (906); the outer side of the hand wheel shaft (902) is fixedly provided with a lifting gear (903), and the lifting gear (903) is meshed with a lifting rack (907).

7. The ligament pulling device for track and field training of claim 3, wherein: the L-shaped shoulder rack A (9) also comprises a one-way block (908) and a slip (909); the bottom of the spring rod B (905) is fixedly provided with a one-way clamping block (908), the bottom of the one-way clamping block (908) can be attached to the top of the one-way rack (206), and the one-way clamping block (908) and the one-way rack (206) form a self-locking mechanism for limiting the L-shaped shoulder frame A (9) to move backwards only; the bottom of the rear side of the L-shaped shoulder frame A (9) is fixedly provided with an inserting strip (909), and the inserting strip (909) is arranged in the slot (207) in a sliding manner.

8. The ligament pulling device for track and field training of claim 3, wherein: the novel pillow is characterized in that the front sides of the bottoms of the L-shaped shoulder frames A (9) and B (10) are integrally provided with extension structures, the tops of the extension structures of the L-shaped shoulder frames A (9) and B (10) are fixedly provided with pillow plates (11), the tops of the pillow plates (11) are fixedly provided with cotton pillows (12), and the rear sides of the cotton pillows (12) are provided with hemispherical grooves.