CN113940853A

CN113940853A - Department of neurology is low limbs care equipment for rehabilitation training

Info

Publication number: CN113940853A
Application number: CN202111212900.9A
Authority: CN
Inventors: 刘欣敏; 倪凤明; 高岚
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-01-18
Anticipated expiration: 2041-10-19
Also published as: CN113940853B

Abstract

The invention discloses lower limb nursing equipment for neurology rehabilitation training, which comprises: a back support plate is rotatably arranged on one side of the top of the bed body; a thigh supporting plate is rotatably connected to the top of the bed body on one side of the back supporting plate, a shank supporting plate is rotatably connected to one end, far away from the back supporting plate, of the thigh supporting plate, and binding pieces are arranged on the upper surfaces of the thigh supporting plate and the shank supporting plate; a first sliding groove is formed in the upper surface of the bed body below the thigh supporting plate, a hydraulic push rod is installed in the first sliding groove in a rotating mode, the telescopic end of the hydraulic push rod is connected with the thigh supporting plate in a rotating mode, a second sliding groove is formed in the upper surface of the bed body below the shank supporting plate, a second sliding block is arranged in the second sliding groove, and one end, far away from the thigh supporting plate, of the shank supporting plate is connected with the second sliding block in a rotating mode. This low limbs nursing equipment for department of neurology rehabilitation training, it is rational in infrastructure, the function is various, has good training effect.

Description

Department of neurology is low limbs care equipment for rehabilitation training

Technical Field

The invention belongs to the technical field of lower limb training, and particularly relates to lower limb nursing equipment for neurology rehabilitation training.

Background

Rehabilitation refers to physical activity after injury that is beneficial to recovery or improvement of function. Appropriate, scientific physical exercises have positive effects on the rapid healing of injuries and promoting functional recovery, such as: keep good physical condition, can prevent muscular atrophy and contracture through rehabilitation training, keep the exercise capacity of the healthy limbs, maintain good cardio-pulmonary function, and immediately put into normal physical exercise once the injury is healed; proper rehabilitation exercise is performed after injury, so that the stability of joints can be enhanced, the metabolism and nutrition of injured tissues can be improved, the healing of injury can be accelerated, and the unification of functions, forms and structures can be promoted; through rehabilitation training after injury, the energy metabolism of the organism tends to be balanced, the weight is prevented from increasing, and the time required for recovery exercise after injury is cured is shortened; therefore, after the lower limbs of the neurology patient are damaged, rehabilitation training needs to be carried out on the lower limbs.

In the prior art, the rehabilitation training is mainly completed by manually assisting the bending of the lower limbs of a patient or automatically bending the lower limbs of the patient; however, the manual assistance mode has the defects of being time-consuming and labor-consuming, not uniform in force and easy to cause injury to the patient, and the self-bending training mode of the patient has the problems of being high in strength, difficult to complete by itself and the like, so that the invention provides the lower limb nursing device for the rehabilitation training of the neurology department by combining with the actual situation.

Disclosure of Invention

The invention aims to provide lower limb nursing equipment for neurology rehabilitation training, and aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a lower limb nursing device for neurology rehabilitation training comprises:

a back support plate is rotatably arranged on one side of the top of the bed body;

a thigh supporting plate is rotatably connected to the top of the bed body on one side of the back supporting plate, a shank supporting plate is rotatably connected to one end, far away from the back supporting plate, of the thigh supporting plate, and binding pieces are arranged on the upper surfaces of the thigh supporting plate and the shank supporting plate;

a first sliding groove is formed in the upper surface of the bed body below the thigh supporting plate, a hydraulic push rod is installed in the first sliding groove in a rotating mode, the telescopic end of the hydraulic push rod is connected with the thigh supporting plate in a rotating mode, a second sliding groove is formed in the upper surface of the bed body below the shank supporting plate, a second sliding block is arranged in the second sliding groove, and one end, far away from the thigh supporting plate, of the shank supporting plate is connected with the second sliding block in a rotating mode.

In a further embodiment, the constraint piece is a bandage, one end of the bandage is fixedly connected with the thigh supporting plate and the shank supporting plate, the other end of the bandage is bonded with the thigh supporting plate and the shank supporting plate through magic tapes, a first interlayer is arranged at a position, far away from the thigh supporting plate and the shank supporting plate, inside the bandage, an air bag is arranged in the first interlayer, a second interlayer is arranged at a position, close to the thigh supporting plate and the shank supporting plate, inside the bandage, an electric heating wire is laid inside the second interlayer, and the electric heating wire is powered by an external power supply.

In a further embodiment, an air pump is horizontally arranged in the second sliding chute at a position close to the first sliding chute, a telescopic end of the air pump is fixedly connected with the second sliding block, and the air pump is communicated with the air bag in the first interlayer through an air pipe.

In a further embodiment, the thigh supporting plate and the shank supporting plate are arranged in a pair side by side, a hip supporting plate is arranged between the thigh supporting plate and the back supporting plate, and the hip supporting plate is fixed on the upper surface of the bed body.

In a further embodiment, an ankle training mechanism is arranged at one end, away from the thigh supporting plate, of the shank supporting plate, the ankle training mechanism comprises a pedal plate rotatably connected with the upper surface of the shank supporting plate, a foot sleeve is arranged at the top of the pedal plate, a fixing plate is vertically arranged on the upper surface, away from the shank supporting plate, of the bed body, and a push-pull assembly is arranged between the fixing plate and the pedal plate.

In a further embodiment, the push-pull assembly comprises a sleeve rotatably connected with the fixed plate, a limiting block is arranged in the sleeve, a second spring is connected between the limiting block and the end wall of the sleeve at a position close to the fixed plate, a movable rod is vertically fixed on one surface of the limiting block far away from the second spring, and the movable rod movably penetrates through the end face of the sleeve and is rotatably connected with the pedal.

In a further embodiment, the sliding device inside the first sliding groove is provided with a first sliding block, the hydraulic push rod is rotatably installed on the first sliding block, a third sliding groove is formed in the upper surface of the bed body below the back supporting plate, a bidirectional threaded rod is horizontally rotatably installed between the third sliding groove and the first sliding groove, the bidirectional threaded rod penetrates through the first sliding block, a groove is formed in one side surface, close to the third sliding groove, of the bed body, and a motor in driving connection with the bidirectional threaded rod is installed in the groove.

In a further embodiment, the sliding device in the third sliding chute is provided with a third sliding block, the third sliding block is sleeved on the bidirectional threaded rod in a threaded manner, and a pushing arm is rotatably connected between the third sliding block and the back support plate.

In a further embodiment, a through groove is formed in the middle of the back support plate, a support back is arranged in the through groove in the movable device, the push arm is rotatably connected with the middle of the lower surface of the support back, and a first spring is connected between the four side walls of the support back and the inner wall of the through groove.

In a further embodiment, the support back is provided with a rotary roller in an embedded type rotating mode, and the surface of the rotary roller is provided with convex strips.

The invention has the technical effects and advantages that: the lower limb nursing equipment for the neurology rehabilitation training can drive the thigh supporting plate and the shank supporting plate to rotate and fold under the driving of the hydraulic push rod, meanwhile, the binding of the bandage is matched to drive the lower limb of a patient to complete bending training, the problems that manual assistance is labor-consuming and the bending training intensity of the patient is high are solved, and under the action of the heating wire in the second interlayer, the hot compress purpose is achieved, the blood circulation is promoted, and the rehabilitation effect is improved by matching with the bending of the lower limb;

the air pump can be pushed to compress in the lower limb bending training process due to the linkage matching of the second sliding block and the air pump, so that the air bags in the first interlayer can be inflated and deflated, the aim of synchronously performing bending training and hot compress massage is fulfilled, the comfort is improved, and the lower limb protection of a patient in the training process is enhanced;

due to the pulling force of the sleeve and the movable rod and the elastic force of the second spring, the ankle and the lower limb can be synchronously trained by the cooperation of the pedal plate and the foot sleeve in the lower limb bending training process;

utilize the drive cooperation of two-way threaded rod, third spout and first slider, can order about back backup pad and thigh backup pad synchronous bending, realize the synchronous training to patient's waist and low limbs and ankle, and utilize to change the roller and can prevent that patient's back muscle is stiff. This low limbs nursing equipment for department of neurology rehabilitation training, it is rational in infrastructure, the function is various, has good training effect.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of the bed of the present invention;

FIG. 3 is a schematic structural view of the back stretching mechanism of the present invention;

FIG. 4 is a schematic diagram of an ankle training mechanism according to the present invention;

FIG. 5 is a schematic view of the push-pull assembly of the present invention;

FIG. 6 is a schematic view of the binder structure of the present invention;

FIG. 7 is a front view of the present invention;

fig. 8 is a bottom structure diagram of the present invention.

In the figure: 1 bed body, 2 back supporting plates, 3 thigh supporting plates, 4 shank supporting plates, 5 binding pieces, 6 ankle training mechanisms, 7 back stretching mechanisms, 8 first sliding grooves, 9 first sliding blocks, 10 hydraulic push rods, 11 second sliding grooves, 12 second sliding blocks, 13 air pumps, 14 third sliding grooves, 15 third sliding blocks, 16 push arms, 17 bidirectional threaded rods, 18 through grooves, 19 support backs, 20 first springs, 21 rotating rollers, 22 convex strips, 23 foot pedals, 24 foot sleeves, 25 push-pull assemblies, 26 fixing plates, 27 sleeves, 28 movable rods, 29 limiting blocks, 30 second springs, 31 bandages, 32 first interlayers, 33 second interlayers, 34 magic tapes, 35 hip supporting plates, 36 grooves and 37 motors.

Detailed Description

The present invention is described in detail with reference to the drawings, but the scope of the present invention is not limited to the following embodiments, and all simple equivalent changes and modifications made by the claims and the contents of the specification of the present invention are still within the scope of the present invention.

As shown in fig. 1 to 8, the present invention includes: a back support plate 2 is rotatably arranged on one side of the top of the bed body 1; the top of the bed body 1 positioned at one side of the back supporting plate 2 is rotatably connected with a thigh supporting plate 3, one end of the thigh supporting plate 3, which is far away from the back supporting plate 2, is rotatably connected with a shank supporting plate 4, and the upper surfaces of the thigh supporting plate 3 and the shank supporting plate 4 are respectively provided with a binding piece 5; first spout 8 has been seted up to the bed body 1 upper surface that is located thigh backup pad 3 below, and hydraulic push rod 10 has been installed in the internal rotation of first spout 8, and hydraulic push rod 10's flexible end rotates with thigh backup pad 3 to be connected, and second spout 11 has been seted up to the bed body 1 upper surface that is located shank backup pad 4 below, and 11 internal sliding device of second spout have second slider 12, and shank backup pad 4 keeps away from the one end of thigh backup pad 3 and rotates with second slider 12 to be connected.

The patient lies in back backup pad 2, thigh backup pad 3 and shank backup pad 4 on, utilizes constraint piece 5 to tie thigh and shank fixed, promotes thigh backup pad 3 rotatory through starting hydraulic push rod 10, and thigh backup pad 3 drives shank backup pad 4 activities, drives patient's low limbs and accomplishes crooked training, has solved artifical training and has wasted effort and the big problem of patient's crooked training intensity by oneself.

Constraint piece 5 is bandage 31, the one end and thigh backup pad 3 and shank backup pad 4 fixed connection of bandage 31, the other end passes through magic subsides 34 with thigh backup pad 3 and shank backup pad 4 and bonds, the inside position of keeping away from thigh backup pad 3 and shank backup pad 4 of bandage 31 has first intermediate layer 32, first intermediate layer 32 internal device has the gasbag (not shown in the figure), the inside position of being close to thigh backup pad 3 and shank backup pad 4 of bandage 31 has second intermediate layer 33, the inside heating wire (not shown in the figure) of having laid of second intermediate layer 33, the heating wire is supplied power by external power source.

Magic subsides 34 can make things convenient for the bandage fixed, can make the within range regulation according to patient's leg type simultaneously, utilizes the heating wire can utilize the inflation and the gassing of gasbag, can realize the extrusion massage to patient's low limbs at the crooked training in-process of patient's low limbs, promotes patient blood circulation, improves rehabilitation training effect.

An air pump 13 is horizontally arranged in the second chute 11 at a position close to the first chute 8, the telescopic end of the air pump 13 is fixedly connected with the second slide block 12, and the air pump 13 is communicated with the air bag in the first interlayer 32 through an air pipe.

In the training process, one end of the shank support plate 4, which is far away from the thigh support plate 3, can drive the second slide block 12 to slide, so that when the lower limb of a patient bends, muscles contract, the second slide block 12 can push the air pump 13 to compress so as to inflate the air bag in the first interlayer 32, and further, leg muscles are extruded to be loose, and cramps are prevented; when the leg of the patient is straightened, the muscle is stretched, the second sliding block 12 slides to drive the air pump 13 to contract the air bag, and at the moment, the muscle is stretched and relaxed.

Thigh support plate 3 and shank support plate 4 are equipped with a pair side by side, are equipped with buttock backup pad 35 between thigh support plate 3 and the back backup pad 2, and buttock backup pad 35 is fixed on bed body 1 upper surface.

Through controlling a pair of thigh backup pad 3 synchronous revolution, can drive the synchronous crooked of patient's both legs, the training of squatting is simulated, rotates in turn through controlling a pair of thigh backup pad 3, can drive the crooked in turn of patient's both legs, and then the training of simulation walking, has improved the functionality of this equipment to reply different training schemes, at the rehabilitation training in-process, buttock backup pad 35 is used for supporting patient's buttock, improves the comfort.

The one end that thigh backup pad 3 was kept away from to shank backup pad 4 is equipped with ankle training mechanism 6, and ankle training mechanism 6 includes the running-board 23 of being connected with 4 upper surface rotations of shank backup pad, and running-board 23 top is equipped with podotheca 24, and running-board 23 keeps away from the vertical fixed plate 26 of installing of bed body 1 upper surface of shank backup pad 4 position department, is equipped with push-and-pull subassembly 25 between fixed plate 26 and the running-board 23.

Utilize running-board 23 and podotheca 24 with patient's foot spacing fixed, the low limbs training in-process, under push-and-pull subassembly 25's cooperation, shank backup pad 4 can drive running-board 23 and rotate, drives patient's ankle activity simultaneously, realizes the synchronous training of low limbs and ankle.

The push-pull assembly 25 comprises a sleeve 27 rotatably connected with the fixed plate 26, a limiting block 29 is arranged in the sleeve 27, a second spring 30 is connected between the limiting block 29 and the end wall of the sleeve 27 close to the fixed plate 26, a movable rod 28 is vertically fixed on one surface of the limiting block 29 far away from the second spring 30, and the movable rod 28 movably penetrates through the end surface of the sleeve 27 and is rotatably connected with the pedal plate 23.

When the lower limbs of the patient are bent, the shank support plate 4 drives the pedal plate 23 to stretch the movable rod 28, the limit block 29 limits the movable rod 28, and at the moment, the ankle joint is passively stretched in the back; when the lower limb of the patient is straightened, the lower leg support plate 4 pushes the pedal plate 23 to push the movable rod 28 into the sleeve 27, and the ankle joint is passively plantarflexed under the action of the elastic force of the second spring 30; the leg and ankle linkage is realized, the stability of lower limb joints is enhanced, the blood circulation of the lower limbs is accelerated, and the unification of the functions, the shapes and the structures of the legs and the feet is promoted.

A sliding device in the first sliding groove 8 is provided with a first sliding block 9, a hydraulic push rod 10 is rotatably installed on the first sliding block 9, a third sliding groove 14 is formed in the upper surface of the bed body 1 below the back supporting plate 2, a bidirectional threaded rod 17 is horizontally rotatably installed between the third sliding groove 14 and the first sliding groove 8, threads of the bidirectional threaded rod 17 penetrate through the first sliding block 9, a groove 36 is formed in one side face, close to the third sliding groove 14, of the bed body 1, and a motor 37 in driving connection with the bidirectional threaded rod 17 is installed in the groove 36.

Utilize motor 37 drive two-way threaded rod 17 rotatory, can order about first slider 9 and slide, promote hydraulic push rod 10 and make thigh backup pad 3 rotatory, two kinds of driving methods of two-way threaded rod 17 and hydraulic push rod 10 can reduce equipment failure rate, when motor 37 stops, can drive two-way threaded rod 17 and be in the lock state of dying to guarantee that two kinds of driving methods can go on alone.

The sliding device in the third sliding chute 14 is provided with a third sliding block 15, the third sliding block 15 is sleeved on the bidirectional threaded rod 17 in a threaded manner, and a pushing arm 16 is rotatably connected between the third sliding block 15 and the back support plate 2.

When the bidirectional threaded rod 17 is used for driving, the third sliding block 15 and the first sliding block 9 can be driven to slide towards the directions close to each other, the back supporting plate 2 and the thigh supporting plate 3 can be pushed to rotate synchronously by the aid of the pushing arm 16 and the hydraulic push rod 10, synchronous bending training of the waist and the lower limbs is achieved, and linkage of the lower limbs and the upper body is enhanced.

Through groove 18 has been seted up at 2 middle parts of back backup pad, and the inside movable device that leads to groove 18 has support back 19, pushes away arm 16 and support back 19 lower surface middle part and rotates to be connected, is connected with first spring 20 between support back 19 four side walls and the through groove 18 inner wall, and the inserted rotation is installed and is changeed roller 21 on support back 19, changes roller 21 surface and is equipped with sand grip 22.

When back backup pad 2 rotates and carries out the crooked training of waist, the elastic connection of first spring 20 can make support back 19 hold up patient's back middle part, the back extrudees back backup pad 2 flagging all around, realizes the activity at back, and support the in-process with patient's back middle part at support back 19, utilize to change roller 21 and can roll at patient's back small amplitude, cooperation sand grip 22 is to patient's back extrusion massage, can prevent effectively that the patient from lying the back that leads to for a long time stiff.

The working principle is as follows: when the lower limb nursing device for the rehabilitation training of the neurology department is used, the thighs and the calves of a patient are bound on the thigh supporting plate 3 and the calves supporting plate 4 by the aid of the bandages 31, the thigh supporting plate 3 is pushed to rotate through the hydraulic push rod 10, and the legs of the patient can be driven to bend and train; in the process of bending the legs of the patient, one end of the shank support plate 4, which is far away from the thigh support plate 3, drives the second slide block 12 to slide, the second slide block 12 drives the air pump 13 to compress and inflate the air bag in the first interlayer 32, so as to realize the squeezing massage on the muscles of the legs, and in the process of straightening the legs, the first interlayer 32 contracts; when the pair of thigh supporting plates 3 rotate alternately, the legs of the patient can be bent alternately to simulate walking training, and when the pair of thigh supporting plates 3 rotate synchronously, the legs of the patient can be bent synchronously to simulate squatting training; when the hydraulic push rod 10 is in a contraction state, the motor 37 is used for driving the bidirectional threaded rod 17 to rotate, the third slide block 15 and the first slide block 9 can be driven to mutually approach and slide, and under the support of the push arm 16 and the hydraulic push rod 10, the back support plate 2 and the thigh support plate 3 can be pushed to synchronously rotate, so that the synchronous bending training of legs and waist is realized; utilize the elasticity of first spring 20 to connect, when back backup pad 2 was rotatory, the back 19 with patient's back middle part jack-up, back flagging all around can reach the purpose of opening the shoulder, simultaneously under the rotation effect of commentaries on classics roller 21, the back 19 removes for patient's back, utilizes sand grip 22 to patient's back muscle extrusion massage.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A lower limb nursing device for neurology rehabilitation training comprises:

a back support plate (2) is rotatably arranged on one side of the top of the bed body (1);

the method is characterized in that: the top of the bed body (1) positioned on one side of the back supporting plate (2) is rotatably connected with a thigh supporting plate (3), one end, far away from the back supporting plate (2), of the thigh supporting plate (3) is rotatably connected with a shank supporting plate (4), and the upper surfaces of the thigh supporting plate (3) and the shank supporting plate (4) are respectively provided with a binding piece (5);

first spout (8) have been seted up to bed body (1) upper surface that is located thigh backup pad (3) below, hydraulic rod (10) have been installed in first spout (8) internal rotation, the flexible end and thigh backup pad (3) of hydraulic rod (10) rotate to be connected, second spout (11) have been seted up to bed body (1) upper surface that is located shank backup pad (4) below, second spout (11) inside sliding device has second slider (12), the one end that thigh backup pad (3) were kept away from in shank backup pad (4) rotates with second slider (12) to be connected.

2. The lower limb nursing device for neurological rehabilitation training according to claim 1, wherein: constraint piece (5) are bandage (31), and bandage (31) inside is kept away from the position of thigh backup pad (3) and shank backup pad (4) and is had first intermediate layer (32), and first intermediate layer (32) internal arrangement has the gasbag, and bandage (31) inside is close to the position of thigh backup pad (3) and shank backup pad (4) and has second intermediate layer (33), and the inside electric heating wire that has laid of second intermediate layer (33), and the electric heating wire is supplied power by external power source.

3. The lower limb nursing device for neurological rehabilitation training according to claim 2, wherein: an air pump (13) is horizontally arranged at a position, close to the first sliding groove (8), in the second sliding groove (11), the telescopic end of the air pump (13) is fixedly connected with the second sliding block (12), and the air pump (13) is communicated with an air bag in the first interlayer (32) through an air pipe.

4. The lower limb nursing device for neurological rehabilitation training according to claim 1, wherein: the pair of thigh supporting plates (3) and the pair of shank supporting plates (4) are arranged side by side, a hip supporting plate (35) is arranged between the thigh supporting plates (3) and the back supporting plate (2), and the hip supporting plate (35) is fixed on the upper surface of the bed body (1).

5. The lower limb nursing device for neurological rehabilitation training according to claim 1, wherein: the ankle training mechanism (6) is arranged at one end, far away from the thigh supporting plate (3), of the shank supporting plate (4), the ankle training mechanism (6) comprises a pedal plate (23) rotatably connected with the upper surface of the shank supporting plate (4), a foot sleeve (24) is arranged at the top of the pedal plate (23), a fixing plate (26) is vertically arranged on the upper surface of the bed body (1) far away from the shank supporting plate (4) in the pedal plate (23), and a push-pull assembly (25) is arranged between the fixing plate (26) and the pedal plate (23).

6. The lower limb nursing device for neurological rehabilitation training according to claim 5, wherein: the push-pull assembly (25) comprises a sleeve (27) rotatably connected with the fixed plate (26), a limiting block (29) is arranged in the sleeve (27), a second spring (30) is connected between the limiting block (29) and the end wall of the position, close to the fixed plate (26), in the sleeve (27), one side, far away from the second spring (30), of the limiting block (29) is vertically fixed with a movable rod (28), and the movable rod (28) movably penetrates through the end face of the sleeve (27) and is rotatably connected with the pedal plate (23).

7. The lower limb nursing device for neurological rehabilitation training according to claim 1, wherein: the novel bed is characterized in that a first sliding block (9) is arranged in the first sliding groove (8), a hydraulic push rod (10) is rotatably installed on the first sliding block (9), a third sliding groove (14) is formed in the upper surface of the bed body (1) below the back supporting plate (2), a bidirectional threaded rod (17) is horizontally rotatably installed between the third sliding groove (14) and the first sliding groove (8), the bidirectional threaded rod (17) penetrates through the first sliding block (9) in a threaded mode, a groove (36) is formed in one side face, close to the third sliding groove (14), of the bed body (1), and a motor (37) in driving connection with the bidirectional threaded rod (17) is installed in the groove (36).

8. The lower limb nursing device for neurological rehabilitation training according to claim 7, wherein: and a third sliding block (15) is arranged in the third sliding groove (14) in a sliding manner, the third sliding block (15) is sleeved on the bidirectional threaded rod (17) in a threaded manner, and a pushing arm (16) is rotatably connected between the third sliding block (15) and the back supporting plate (2).

9. The lower limb nursing device for neurological rehabilitation training according to claim 8, wherein: the novel back support device is characterized in that a through groove (18) is formed in the middle of the back support plate (2), a back support (19) is arranged in the through groove (18), a push arm (16) is rotatably connected with the middle of the lower surface of the back support (19), and a first spring (20) is connected between the four side walls of the back support (19) and the inner wall of the through groove (18).

10. The lower limb nursing device for neurological rehabilitation training according to claim 9, wherein: the support back of the body (19) is gone up the inserted rotation and is installed and change roller (21), changes roller (21) surface and is equipped with sand grip (22).