CN220801299U

CN220801299U - Nursing frame

Info

Publication number: CN220801299U
Application number: CN202322313935.2U
Authority: CN
Inventors: 刘畅
Original assignee: First Medical Center of PLA General Hospital
Current assignee: First Medical Center of PLA General Hospital
Priority date: 2023-08-28
Filing date: 2023-08-28
Publication date: 2024-04-19
Anticipated expiration: 2033-08-28

Abstract

The utility model provides a nursing frame, and relates to the technical field of medical appliances. The nursing frame comprises: a suspension assembly; one end of the first supporting rod is rotationally connected with the suspension assembly, and the other end of the first supporting rod is rotationally connected with the bed body; one end of the second supporting rod is provided with a clamping block, and the other end of the second supporting rod is used for being rotationally connected with the bed body; the locking piece is arranged on the first supporting rod and is detachably connected with the second supporting rod; the hanging assembly is provided with a first clamping groove and a second clamping groove which are matched with the clamping block; the position relation between the nursing frame and the bed body is in a first state and a second state; in the first state, the hanging component is positioned at the side of the bed body, the clamping block is matched with the first clamping groove, the locking piece and the second supporting rod are separated from each other, and the first state is a storage state of the nursing frame; in the second state, the suspension assembly is positioned above the bed body, the clamping block is matched with the second clamping groove, the locking piece is connected with the second supporting rod, and the second state is a supporting state when the nursing frame supports the legs.

Description

Nursing frame

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a nursing frame.

Background

Leg lifting is generally required after fracture, and soft tissues and capillaries can be damaged to cause edema due to bleeding possibly accompanying fracture section during fracture; in addition, veins are greatly destroyed during fracture, affecting local blood circulation. In the prior art, a bracket is generally arranged on a sickbed, and then a bandage is tied on the bracket to hang the leg of a patient.

The utility model patent with publication number CN213553155U discloses a nursing fixing bracket for a sickbed for leg fracture, which comprises a base, an adjusting rod, an adjusting seat, a cross rod and a fixing device; the base spans across the sickbed and is fixed on the sickbed by screws; the adjusting rod is vertically arranged on the base, two ends of the cross rod are respectively connected with an adjusting seat, and the adjusting seats are arranged on the adjusting rod in a sliding manner; the fixing device is arranged on the cross bar and is used for lifting the legs of the patient. The leg fracture sick bed nursing fixed bolster among the prior art passes through the screw fixation on the sick bed, need tear down the screw when the fixed bolster does not use and take off the fixed bolster from the sick bed and place in other positions, but the size of fixed bolster is great, inconvenient accomodate, the inconvenient use of mount.

Accordingly, there is a need to provide a care stand that is easy to store.

Disclosure of utility model

The utility model aims to provide a nursing frame which solves the technical problem that a fixing bracket for suspending the legs of a patient in the prior art is inconvenient to store _.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

The utility model provides a nursing frame, comprising: a suspension assembly for suspending a leg of a patient; one end of the first supporting rod is rotationally connected with the suspension assembly, and the other end of the first supporting rod is rotationally connected with the bed body; one end of the second supporting rod is provided with a clamping block, and the other end of the second supporting rod is used for being rotationally connected with the bed body; one end of the locking piece is arranged on the first supporting rod, and the other end of the locking piece is detachably connected with the second supporting rod; the hanging assembly is provided with a first clamping groove and a second clamping groove which are matched with the clamping block and are opened towards the second supporting rod; the position relation between the nursing frame and the bed body is in a first state and a second state; in the first state, the suspension assembly is positioned at the side of the bed body, the clamping block is matched with the first clamping groove, and the locking piece and the second supporting rod are separated from each other; in the second state, the suspension assembly is positioned above the bed body, the clamping block is matched with the second clamping groove, and the locking piece is connected with the second supporting rod.

Preferably, the length of the first supporting rod is longer than that of the second supporting rod, and the joint of the first supporting rod and the bed body is lower than that of the second supporting rod; in the second state, the first support bar and the second support bar are parallel to each other.

Preferably, the outer side wall of the locking piece is provided with threads, the first supporting rod is provided with a first threaded hole, and the locking piece is in threaded connection with the first supporting rod; in the second state, one end of the locking piece abuts against the second supporting rod.

Preferably, the outer side wall of the locking piece is provided with threads, the second supporting rod is provided with a second threaded hole, the first supporting rod is provided with a mounting hole corresponding to the second threaded hole, and the locking piece is provided with a knob with the diameter larger than that of the mounting hole; in the second state, the locking piece passes through the mounting hole and is in threaded connection with the second supporting rod.

Preferably, the clamping block is cylindrical, and the first clamping groove and the second clamping groove are arc-shaped grooves.

Preferably, the clamping block is prismatic, and the first clamping groove and the second clamping groove are prismatic grooves.

Preferably, the suspension assembly comprises a support, a drawstring and a fixed sleeve; the support is connected with the first support rod and provided with a first clamping groove and a second clamping groove; the number of the pull belts is two, one end of each pull belt is connected with the fixed sleeve, and the other end of each pull belt is connected with the support; the fixing sleeve is used for placing the legs of a patient.

Preferably, the suspension assembly further comprises a roll shaft and a compactor; the roll shaft is rotationally connected with the support; the number of the roll shafts is two, each roll shaft is connected with one of the pull belts, and the number of the roll shafts is two, and each roll shaft is used for rolling up or paying out one of the pull belts; the compactor is arranged on the support and used for fixing the pull belt and preventing the pull belt from rotating around the roller shaft.

Preferably, the support is provided with a mounting groove, and the two groups of roll shafts and the compactor are respectively positioned at two sides of the mounting groove; the pressing device comprises a first connecting piece and a second connecting piece which are vertically intersected, the first connecting piece is positioned in the mounting groove and is rotationally connected with the support, and the second connecting piece is detachably connected with the support; the roll shaft is positioned at the outer side of the mounting groove, and the first connecting piece is provided with a connecting groove for the pull belt to pass through; when the second connecting piece is connected with the support, the first connecting piece compresses the drawstring on the support.

Compared with the prior art, the embodiment of the utility model has at least the following advantages or beneficial effects:

The first support rod and the second support rod are both used for being in rotary connection with an external bed body, when the nursing frame does not need to support the legs of a patient, the first support rod rotates around the bed body and drives the hanging assembly to move to the side edge of the bed body, and at the moment, the hanging assembly is in a storage state and can not interfere with the movement of the patient or medical staff, so that the nursing frame is convenient to store. When the nursing frame is needed to support the legs, the clamping blocks on the second supporting rods are matched with the first clamping grooves, so that the second supporting rods can be limited to rotate around the bed body, the second supporting rods are prevented from hanging on the bed body, and the free ends of the second supporting rods interfere with the legs of a person; when the first support rod drives the suspension assembly to move to the upper part of the bed body, the clamping block on the second support rod is matched with the second clamping groove, and the locking piece is connected with the second support rod, at the moment, the distance between the first support rod and the second support rod is limited by the locking piece, so that the first support rod and the second support rod cannot rotate relative to the bed body; because hang the subassembly and cooperate with patient's shank, hang the subassembly and have decurrent pressure to first bracing piece and second bracing piece, and the notch of second draw-in groove is towards the second bracing piece for the second bracing piece is difficult for breaking away from hanging the subassembly, makes the support of nursing frame to patient's shank comparatively stable.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a nursing frame in a second state of an embodiment of the utility model;

FIG. 2 is a schematic view of the structure of the nursing frame in the first state of the embodiment of the utility model;

FIG. 3 is a schematic view of the structure of a support according to an embodiment of the present utility model;

FIG. 4 is a schematic view showing the structure of a second support bar according to an embodiment of the present utility model;

Fig. 5 is a schematic view showing the structure of a compactor and a roller shaft according to an embodiment of the present utility model.

Icon: 1. a suspension assembly; 101. a first clamping groove; 102. a second clamping groove; 103. a mounting groove; 11. a support; 111. positioning columns; 12. pulling a belt; 13. a fixed sleeve; 14. a roll shaft; 15. a compactor; 151. a first connector; 15101. a connecting groove; 152. a second connector; 15201. positioning holes; 2. a first support bar; 3. a second support bar; 31. a clamping block; 4. and a locking piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.

The present utility model provides a care stand, with reference to fig. 1 and 2, comprising: a suspension assembly 1 for suspending a patient's leg; one end of the first support rod 2 is rotationally connected with the suspension assembly 1, and the other end of the first support rod is rotationally connected with the bed body; a second support rod 3, one end of which is provided with a clamping block 31, and the other end of which is used for being rotationally connected with the bed body; one end of the locking piece 4 is arranged on the first supporting rod 2, and the other end of the locking piece is detachably connected with the second supporting rod 3; wherein, the hanging component 1 is provided with a first clamping groove 101 and a second clamping groove 102 which are matched with the clamping block 31 and are opened towards the second supporting rod 3; the position relation between the nursing frame and the bed body is in a first state and a second state; in the first state, the hanging assembly 1 is positioned at the side of the bed body, the clamping block 31 is matched with the first clamping groove 101, and the locking piece 4 and the second supporting rod 3 are separated from each other; in the second state, the hanging assembly 1 is located above the bed body, the clamping block 31 is matched with the second clamping groove 102, and the locking piece 4 is connected with the second supporting rod 3.

In some embodiments, the nursing frame can cooperate with the bed body, and the nursing frame can be used for supporting patient's shank after fracture, and when need not support patient's shank, can accomodate the side to the bed body with the nursing frame, it is all comparatively convenient to use and accomodate.

Referring to fig. 1 and 2, the first support bar 2 and the second support bar 3 are both used for being rotatably connected with an external bed body, and the first support bar 2 and the second support bar 3 are close to the bed tail. The mounting positions of the first support rod 2 and the second support rod 3 are set according to the requirements, the distance from the first support rod 2 to the end part of the bed is required to be smaller than the length of the first support rod 2, and the distance from the second support rod 3 to the end part of the bed is required to be smaller than the length of the second support rod 3. When the first support rod 2 drives the suspension assembly 1 to move to the side of the bed body, the suspension assembly 1 is in a storage state and cannot interfere with the actions of patients or medical staff; the clamping block 31 on the second supporting rod 3 is matched with the first clamping groove 101, so that the second supporting rod 3 can be limited to rotate around the bed body; at this time, the opening of the first clamping groove 101 is downward, the suspension assembly 1 is mounted on the clamping block 31 under the action of gravity, and the movement of the suspension assembly 1 is limited by the clamping block 31, so as to avoid the suspension assembly 1 from shaking around the first supporting rod 2.

When the first support rod 2 drives the suspension assembly 1 to move to the upper part of the bed body, the clamping block 31 on the second support rod 3 is matched with the second clamping groove 102, the locking piece 4 is connected with the second support rod 3, at the moment, the distance between the first support rod 2 and the second support rod 3 is limited by the locking piece 4, the length of each side of the quadrangle formed by the first support rod 2, the second support rod 3, the suspension assembly 1 and the bed body is locked, the shape of the quadrangle cannot be changed, and the first support rod 2 and the second support rod 3 cannot rotate relative to the bed body; because the notch of second draw-in groove 102 is towards second bracing piece 3, hang subassembly 1 and the shank cooperation of disease, hang subassembly 1 and have decurrent pressure to first bracing piece 2 and second bracing piece 3 for second bracing piece 3 is difficult for breaking away from hanging subassembly 1, makes the support of nursing frame to the patient shank comparatively stable.

The nursing frame under the first state is in the state of accomodating, and nursing frame pastes at the side of the bed body this moment, can not influence medical personnel or the action of disease. The nursing frame is adjusted to the first state from the second state, only the first support rod 2 and the second support rod 3 are required to be rotated, and the clamping block 31 on the second support rod 3 is moved from the second clamping groove 102 to the first clamping groove 101, so that the operation is simple, and the storage is convenient. Similarly, when the patient leg needs to be supported, the nursing frame is only required to be adjusted to the second state from the first state, the first support rod 2 and the second support rod 3 only need to be rotated, and the clamping block 31 on the second support rod 3 is moved from the first clamping groove 101 to the second clamping groove 102, so that the nursing frame is convenient to use.

In some embodiments, the ends of the first support bar 2 and the second support bar 3 near the bed body may be provided with a rotation pin, which is drilled on the frame of the bed body, inserted into a through hole on the frame and rotatably connected with the frame. In other embodiments, the first support rod 2 and the second support rod 3 may be rotatably connected to a clamp, and clamped on the bed body by using the clamp, so as to achieve connection of the first support rod 2 and the second support rod 3 to the bed body.

In some embodiments, referring to fig. 1 and 2, the length of the first support bar 2 is greater than the length of the second support bar 3, and the connection of the first support bar 2 to the bed is lower than the connection of the second support bar 3 to the bed; in the second state, the first support bar 2 and the second support bar 3 are parallel to each other.

In detail, the first support bar 2 is closer to the tail of the bed body than the second support bar 3, in the second state, the first support bar 2 and the second support bar 3 can be kept perpendicular to the upper end face of the bed body, the upper ends of the first support bar 2 and the second support bar 3 can be equal in height, and the first support bar 2, the second support bar 3, the suspension assembly 1 and the bed body form a right trapezoid. It should be noted that, the dimensions of the clamping block 31, the position of the clamping block 31 on the second supporting rod 3, and the depth of the second clamping groove 102 are set according to the requirement, but it is required that the upper end surface of the bed body is parallel to the upper end surface of the suspension assembly 1 in the second state. In the first state, the second support rod 3 is put on the upper part of the first support rod 2, the long sides of the first support rod 2 and the second support rod 3 can be parallel to the length direction of the bed body, the lengths of the sides of the quadrangle formed by the first support rod 2, the second support rod 3, the hanging component 1 and the bed body are locked, and at the moment, the second support rod 3 and the first support rod 2 cannot rotate downwards relative to the bed body.

In some embodiments, referring to fig. 1 and 2, the outer side wall of the locking member 4 is provided with threads, the first support rod 2 is provided with a first threaded hole, and the locking member 4 is in threaded connection with the first support rod 2; in the second state, one end of the lock member 4 abuts the second support rod 3.

In detail, in the second state, the first support rod 2 and the second support rod 3 may be parallel to each other, at this time, the end surface of the second support rod 3 near the first support rod 2 and the axis of the locking member 4 are perpendicular to each other, the end of the locking member 4 is rotated to abut against the second support rod 3, the second support rod 3 has a tendency to rotate relative to the bed body after being stressed, at this time, the second support rod 3 drives the clamping block 31 to press the side wall of the second clamping groove 102, so that the suspension assembly 1 is not easy to separate from the clamping block 31. After the locking piece 4 butt second bracing piece 3, the distance between first bracing piece 2 and the second bracing piece 3 is locked, and first bracing piece 2, second bracing piece 3, suspension element 1 and the bed body constitute right trapezoid this moment, and first bracing piece 2 and second bracing piece 3 can not rotate relatively the bed body any more for nursing frame steadiness is better.

In some embodiments, the outer side wall of the locking piece 4 is provided with threads, the second supporting rod 3 is provided with a second threaded hole, the first supporting rod 2 is provided with a mounting hole corresponding to the second threaded hole, and the locking piece 4 is provided with a knob with a diameter larger than that of the mounting hole; in the second state, the locking member 4 passes through the mounting hole and is screwed with the second support rod 3.

In detail, in the second state, the first support rod 2 is arranged in parallel with the second support rod 3, after the locking piece 4 is in threaded connection with the second support rod 3, the knob on the locking piece 4 abuts against the end face of the first support rod 2, the locking piece 4 is rotated to enable the second support rod 3 to axially move relative to the locking piece 4, at this time, the second support rod 3 drives the clamping block 31 to abut against the side wall (not shown in the figure) of the second clamping groove 102, so that the hanging assembly 1 is not easy to separate from the clamping block 31, and stability of the nursing frame is improved.

In some embodiments, referring to fig. 4, the clamping block 31 is cylindrical, and the first clamping groove 101 and the second clamping groove 102 are arc-shaped grooves.

In detail, the sidewalls of the first clamping groove 101 and the second clamping groove 102 may be curved, so that the first clamping groove 101 and the second clamping groove 102 can be relatively smoothly clamped on the clamping block 31 when the suspension assembly 1 rotates around the first supporting rod 2. The bottoms of the first and second clamping grooves 101 and 102 may be arc-shaped and adapted to the clamping block 31.

In some embodiments, the clamping block 31 is prismatic (not shown), and the first clamping groove 101 and the second clamping groove 102 are prismatic grooves. For example, the first clamping groove 101 and the second clamping groove 102 are rectangular grooves, the clamping block 31 can be cuboid, the section of the clamping block 31 is square, after the clamping block 31 is matched with the first clamping groove 101 or the second clamping groove 102, the clamping block 31 is not easy to relatively rotate in the first clamping groove 101 or the second clamping groove 102, the clamping blocks are not easy to separate from each other, and the connecting effect of the clamping block 31 and the clamping groove is good.

In some embodiments, referring to fig. 1, the suspension assembly 1 includes a support 11, a drawstring 12, and a retaining sleeve 13; the support 11 is connected with the first support rod 2 and is provided with a first clamping groove 101 and a second clamping groove 102; the number of the pull belts 12 is two, one end of each pull belt 12 is connected with the fixed sleeve 13, and the other end of the pull belt 12 is connected with the support 11; the fixation sleeve 13 is used for placement of the patient's leg.

In detail, the fixing sleeve 13 is U-shaped and has an upward opening, two ends of the fixing sleeve 13 are respectively connected with one pull belt 12, and the two pull belts 12 are arranged in a V-shape. When the legs of the patient need to be suspended, the legs of the patient need only be placed on the fixing sleeve 13 from top to bottom. The fixing sleeve 13 may be made of a flexible material, such as leather, rubber, etc., and a buffer layer, such as a latex pad, a cotton pad, etc., may be provided on the side of the fixing sleeve 13 contacting the leg portion, so that the leg portion is comfortable after contacting the fixing sleeve 13.

In some embodiments, referring to fig. 1 and 5, the suspension assembly 1 further comprises a roller shaft 14 and a compactor 15; the roll shaft 14 is rotationally connected with the support 11; the number of the rollers 14 is two and each roller 14 is connected with one of the pull tapes 12, and the number of the rollers 14 is two and each roller 14 is used for winding up or paying out one of the pull tapes 12; the presser 15 is provided on the holder 11 and serves to fix the pull tape 12 against rotation of the pull tape 12 about the roller 14.

In detail, the roller 14 is used for winding the pull belt 12, and the relative height between the fixing sleeve 13 and the bed body is adjusted by adjusting the length of the pull belt 12 between the roller 14 and the fixing sleeve 13, and the longer the length of the pull belt 12 between the roller 14 and the fixing sleeve 13, the lower the height of the fixing sleeve 13. The roll shaft 14 rotates relative to the support 11, and when the length of the pull belt 12 is adjusted to a required length, the pull belt 12 is fixed by the compactor 15, so that the leg is prevented from being placed on the fixing sleeve 13, and the fixing sleeve 13 drives the pull belt 12 to move downwards.

In some embodiments, referring to fig. 3, the support 11 is provided with a mounting groove 103, and two sets of rollers 14 and compactors 15 are respectively located at two sides of the mounting groove 103; the compactor 15 comprises a first connecting piece 151 and a second connecting piece 152 which are vertically intersected, the first connecting piece 151 is positioned in the mounting groove 103 and is in rotary connection with the support 11, and the second connecting piece 152 is detachably connected with the support 11; the roller shaft 14 is positioned outside the mounting groove 103, and the first connecting piece 151 is provided with a connecting groove 15101 for passing the pull belt 12; when the second connecting member 152 is connected to the support 11, the first connecting member 151 presses the pull strap 12 against the support 11.

In detail, the support 11 may have a flat plate shape, and the length of the support 11 may be the same as the width of the bed. Taking the second state of the nursing frame as an example, the notch of the mounting groove 103 can face the head of the bed body, the mounting groove 103 is located right above the fixing sleeve 13, and the mounting groove 103 penetrates the support 11. The roller 14 may be located above the support 11; a positioning column 111 is arranged above the support 11, and a positioning hole 15201 corresponding to the positioning column 111 is arranged on the second connecting piece 152. The second connecting piece 152 is separated from the positioning column 111 by rotating the compactor 15, and the compactor 15 can be rotated by a certain angle according to the requirement, so that the pull belt 12 can move smoothly through the connecting groove 15101, and the rotatable roller 14 is used for releasing or rolling up the pull belt 12. The rotating compactor 15 makes the second connecting piece 152 cooperate with the positioning column 111, at this time, the first connecting piece 151 and the second connecting piece 152 are both attached to the surface of the support 11, and the second connecting piece 152 compacts the pull belt 12 on the support 11, so as to prevent the pull belt 12 from sliding, and realize the function of fixing the pull belt 12. The hold down 15 is simple to operate for fixing and releasing the pull tape 12, and is convenient to use.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A care stand, comprising:

A suspension assembly for suspending a leg of a patient;

One end of the first supporting rod is rotationally connected with the suspension assembly, and the other end of the first supporting rod is rotationally connected with the bed body;

one end of the second supporting rod is provided with a clamping block, and the other end of the second supporting rod is used for being rotationally connected with the bed body;

One end of the locking piece is arranged on the first supporting rod, and the other end of the locking piece is detachably connected with the second supporting rod; wherein,

The hanging assembly is provided with a first clamping groove and a second clamping groove which are matched with the clamping block and are opened towards the second supporting rod; the position relation between the nursing frame and the bed body is in a first state and a second state; in the first state, the suspension assembly is positioned at the side of the bed body, the clamping block is matched with the first clamping groove, and the locking piece and the second supporting rod are separated from each other; in the second state, the suspension assembly is located above the bed body, the clamping block is matched with the second clamping groove, and the locking piece is connected with the second supporting rod.

2. The care frame as recited in claim 1, wherein said first support bar has a length greater than a length of said second support bar, a junction of said first support bar with said bed being lower than a junction of said second support bar with said bed; in the second state, the first support bar and the second support bar are parallel to each other.

3. The care rack as recited in claim 2, wherein said locking member has threads on an outer sidewall thereof, said first support rod has a first threaded hole, and said locking member is threadedly coupled to said first support rod; in the second state, one end of the locking piece abuts against the second supporting rod.

4. The care rack as recited in claim 2, wherein an outer side wall of said locking member is provided with threads, said second support rod is provided with a second threaded hole, said first support rod is provided with a mounting hole corresponding to said second threaded hole, and said locking member is provided with a knob having a diameter larger than said mounting hole; in the second state, the locking piece passes through the mounting hole and is in threaded connection with the second supporting rod.

5. The care rack as recited in claim 1, wherein said clip is cylindrical and said first clip slot and said second clip slot are arcuate slots.

6. The care rack as recited in claim 1, wherein said clip is prismatic, and said first clip groove and said second clip groove are prismatic grooves.

7. The care stand of claim 1 wherein the suspension assembly comprises a support, a drawstring, and a retaining sleeve; the support is connected with the first supporting rod and provided with the first clamping groove and the second clamping groove; the number of the pull belts is two, one end of each pull belt is connected with the fixed sleeve, and the other end of each pull belt is connected with the support; the fixing sleeve is used for placing the legs of a patient.

8. The care rack of claim 7 wherein the suspension assembly further comprises a roller and a compactor; the roll shaft is rotationally connected with the support; the number of the roller shafts is two, each roller shaft is connected with one of the pull tapes, and each roller shaft is used for rolling up or paying out one of the pull tapes; the compactor is arranged on the support and used for fixing the pull belt and preventing the pull belt from rotating around the roll shaft.

9. The care rack as recited in claim 8, wherein said support is provided with a mounting groove, and two sets of said roller shafts and said compactor are respectively located on both sides of said mounting groove; the compactor comprises a first connecting piece and a second connecting piece which are vertically intersected, the first connecting piece is positioned in the mounting groove and is rotationally connected with the support, and the second connecting piece is detachably connected with the support; the roller shaft is positioned at the outer side of the mounting groove, and the first connecting piece is provided with a connecting groove for the pull belt to pass through; when the second connecting piece is connected with the support, the first connecting piece presses the pull belt on the support.