Multi-drainage-tube fixing device

Abstract

The utility model discloses a multi-drainage-tube fixing device which comprises a fixing plate composed of two detachable sub-plates, and a plurality of arc-shaped grooves are formed in the butt joint faces of the two sub-plates. The plurality of bunching pipes are arranged on the fixing plate, each bunching pipe is composed of two detachable bunching half pipes, and the bunching half pipes are arranged on the outer edges of the arc-shaped grooves and are integrally formed with the sub-plates; and the multiple pipe fixing lock sleeves are installed on the multiple bunching pipes in a threaded mode respectively, each pipe fixing lock sleeve is composed of two detachable half lock sleeves, and the two half lock sleeves can be clamped or unlocked in an axial sliding mode after being in butt joint. According to the utility model, the fixing plate and the plurality of bunching tubes which can be spliced in a butt joint manner are arranged, the plurality of drainage tubes are separated and limited at the opening of the clothes, and the tube fixing lock sleeves which can be spliced in a butt joint manner are arranged on the bunching tubes, so that the tube fixing lock sleeves which are spliced in advance and are sleeved on the drainage tubes in a sliding manner can be mounted on the bunching tubes in a threaded manner and tighten the drainage tubes; the reliability of separation and fixation of the drainage tube can still be kept after the drainage tube is loosened and fixed many times.

Description

Technical Field

[0001] The utility model relates to the field of medical auxiliary equipment, in particular to a multiple drainage tube fixing device. Background Art

[0002] Medical drainage tubes are mainly used to guide pus, blood, and fluid accumulated between human tissues or in body cavities to the outside of the body after surgery. Multiple drainage tubes are usually placed in areas with large surgical ranges, long surgical incisions, or special site surgeries (gastric surgery, intestinal surgery).

[0003] In order to facilitate the management of multiple drainage tubes, after the drainage tubes are placed in certain parts covered by clothes (such as the legs, chest and abdomen, and other areas that require clothing), it is usually necessary to manually cut the clothes into openings, lead out the drainage tubes, and separate and fix them again to facilitate observation and care, and to avoid interference (entanglement, mutual friction, etc.) between the multiple drainage tubes, which may affect the stability of the drainage tube placement.

[0004] At present, after multiple drainage tubes are led out clinically, they are usually separated and fixed by sticking them separately on clothes with tape. However, in actual use, this fixing method requires patients to put on and take off clothes many times a day (such as wiping the body, going to the toilet, etc.). Before putting on and taking off clothes, the tape needs to be peeled off to loosen the drainage tubes, so as to prevent the drainage tubes from being pulled by the clothes and causing them to loosen or slip. Peeling the tape off the clothes many times will affect its stickiness, which may easily cause the drainage tubes to detach from the clothes and rub or entangle during activities, thereby affecting the stability of the drainage tube placement.

[0005] Therefore, the commonly used clinical method of using tape to stick the drainage tubes to clothing for separation and fixation is difficult to maintain the reliability of separation and fixation after loosening the drainage tubes multiple times, which can easily cause the drainage tubes to fall off the clothing and interfere with each other, affecting the stability of the drainage tube placement. Utility Model Content

[0006] The utility model aims to provide a multiple drainage tube fixing device to solve the technical problem in the prior art that it is difficult to maintain the reliability of separation and fixation after the drainage tubes are loosened and fixed multiple times, which easily causes the drainage tubes to fall off from the clothes and interfere with each other.

[0007] In order to solve the above technical problems, the utility model specifically provides the following technical solutions:

[0008] A multiple drainage tube fixing device, comprising:

[0009] A fixing plate, the fixing plate is composed of two detachably connected sub-plates, the two sub-plates can be fixed at the clothing opening, and the butt joint surfaces of the two sub-plates are penetrated with a plurality of equally distributed arc grooves, and the relatively plurality of arc grooves can be butt jointed to form a plurality of equally distributed circular holes to separate and limit the plurality of drainage tubes;

[0010] A plurality of bundled tubes, wherein the plurality of bundled tubes are arranged on the fixed plate, and the bundled tubes are composed of two detachably connected bundled half-tubes, wherein the bundled half-tubes are arranged on the outer edge of the arc-shaped groove and are integrally formed with the sub-plate;

[0011] A plurality of fixed pipe locking sleeves, wherein the plurality of fixed pipe locking sleeves are respectively threadedly mounted on the plurality of bundled pipes, and the fixed pipe locking sleeves are composed of two detachably connected half locking sleeves, and the two half locking sleeves can be axially slidably engaged or unlocked after docking;

[0012] The tube-fixing locking sleeve that is pre-engaged and mounted on the drainage tube can be threadedly mounted on the binding tube, so that the binding tube can tighten and fix the drainage tube to limit the movement of the drainage tube between the two arc-shaped grooves.

[0013] As a preferred solution of the utility model, the bundled half-tube includes an integrally formed semi-flat tube section and a semi-conical bundle section, and the diameter of the semi-conical bundle section gradually decreases from one end of the semi-flat tube section close to the semi-flat tube section to one end of the semi-conical bundle section away from the semi-flat tube section;

[0014] Wherein, the outer wall of the semi-flat pipe section is formed with grooves, so that after the two bundled half-pipes form the bundled pipe, the grooves of the two semi-flat pipe sections form a continuous external thread.

[0015] As a preferred solution of the utility model, the semi-locking sleeve comprises an integrally formed semi-flat sleeve section and a semi-inner cone section, and the diameter of the inner wall of the semi-inner cone section from one end close to the semi-flat sleeve section to the inner wall of the semi-inner cone section away from the semi-flat sleeve section gradually decreases, and the slope of the semi-inner cone section is greater than the slope of the semi-cone beam section;

[0016] Among them, the inner wall of the semi-flat sleeve section is formed with grooves, so that after the two semi-locking sleeves form the fixed pipe locking sleeve, the grooves of the two semi-flat sleeve sections form a continuous internal thread, and the internal thread formed by the two semi-flat sleeve sections matches the external thread formed by the two semi-flat pipe sections.

[0017] As a preferred solution of the utility model, a plurality of clamping columns and a plurality of clamping grooves are arranged on the butt joint surfaces of the two said bundled half-tubes constituting the bundled tube, and the plurality of said clamping columns and the plurality of said clamping grooves on the same said bundled half-tube are arranged alternately;

[0018] The plurality of clamping posts and the plurality of clamping slots on the two bundled half-tubes are arranged in an alternating manner and in an opposite manner, so that the plurality of clamping posts and the plurality of clamping slots on the two bundled half-tubes are aligned and matched one by one.

[0019] As a preferred solution of the utility model, a plurality of anti-slip rubber pads are arranged on the inner wall of the bundled half-tube, and a plurality of the anti-slip rubber pads are arranged on the semi-conical bundle section.

[0020] As a preferred solution of the utility model, a plurality of slide grooves and a plurality of slide plates are respectively arranged on the butt joint surfaces of the two half lock sleeves constituting the fixed pipe lock sleeve, the slide grooves are formed with large and small notches interconnected at their notches, and a limit plate is arranged at the end of the slide plate;

[0021] Wherein, the limiting plate can be inserted into the sliding groove from the large notch and slide, and the sliding plate can slide in the small notch.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The utility model is provided with a fixing plate and a plurality of binding tubes that can be butted and assembled, separates and limits the plurality of drainage tubes at the openings of clothing, and provides a fixing tube locking sleeve that can be butted and assembled on the binding tube, so that the fixing tube locking sleeve that is pre-assembled and slidably sleeved on the drainage tube can be threadedly installed on the binding tube and tighten the drainage tube, so that the reliability of separation and fixation of the drainage tube can be maintained after the drainage tube is loosened and tightened for multiple times. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0025] Figure 1 A schematic structural diagram of a multi-drainage tube fixing device is provided for an embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the structure of the bundled tube and the tube-fixing locking sleeve of the multiple drainage tube fixing device is provided for an embodiment of the utility model.

[0027] The numbers in the figure represent the following:

[0028] 1-fixed plate; 2-bundle tube; 3-fixed tube locking sleeve;

[0029] 11-sub-plate; 12-arc groove; 21-bundled half-tube; 31-half-locking sleeve;

[0030] 211-semi-flat pipe section; 212-semi-conical section; 213-clamping column; 214-clamping groove; 215-anti-slip rubber pad; 311-semi-flat sleeve section; 312-semi-inner cone section; 313-slide groove; 314-slide plate; 315-large notch; 316-small notch; 317-limiting plate. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] like Figure 1 and Figure 2 As shown, the utility model provides a multi-drainage tube fixing device, comprising:

[0033] The fixing plate 1 is composed of two detachably connected sub-plates 11, the two sub-plates 11 can be fixed at the opening of the clothing, and the connecting surfaces of the two sub-plates 11 are penetrated by a plurality of equally distributed arc grooves 12, and the relatively multiple arc grooves 12 can be connected to form a plurality of equally distributed circular holes to separate and limit the multiple drainage tubes;

[0034] A plurality of bundled tubes 2, wherein the plurality of bundled tubes 2 are arranged on the fixed plate 1, and the bundled tube 2 is composed of two detachably connected bundled half-tubes 21, and the bundled half-tubes 21 are arranged on the outer edge of the arc-shaped groove 12 and are integrally formed with the sub-plate 11;

[0035] A plurality of fixed pipe locking sleeves 3, wherein the plurality of fixed pipe locking sleeves 3 are respectively threadedly mounted on the plurality of bundled pipes 2, and the fixed pipe locking sleeve 3 is composed of two detachably connected half locking sleeves 31, and the two half locking sleeves 31 can be axially slidably engaged or unlocked after docking;

[0036] The tube-fixing locking sleeve 3 , which is pre-engaged and mounted on the drainage tube, can be threadedly mounted on the binding tube 2 , so that the binding tube 2 can tighten and fix the drainage tube to limit the movement of the drainage tube between the two arc-shaped grooves 12 .

[0037] The fixing device of this embodiment mainly utilizes a fixing plate 1 which can be fixed at the opening of clothing (patient gown) and is composed of two sub-plates 11, and clamps multiple drainage tubes in the arc groove 12 on the mating surface of the sub-plate 11 to limit their positions, so that the multiple drainage tubes can be separated without interfering with each other during movement. After the multiple drainage tubes are limited by the arc groove 12, they are located in multiple bundled tubes 2, and are installed and locked on the bundled tubes 2 through the fixed tube locking sleeve 3, so that the bundled tube 2 can tighten and fix the drainage tubes placed therebetween, thereby preventing the drainage tubes from being pulled during movement and causing them to loosen or slip.

[0038] The bundled tube 2 and the fixed plate 1 are integrally formed, that is, the sub-plate 11 of the fixed plate 1 and the bundled half-tube 21 of the bundled tube 2 are integrally formed.

[0039] The tube-fixing locking sleeve 3 is separable from the bundled tube 2, and the tube-fixing locking sleeve 3 is composed of two assembleable half-locking sleeves 31, so it can be mounted on the drainage tube by docking. Similarly, the fixing plate 1 and the bundled tube 2 can fix or remove the drainage tube after it is placed, without affecting the nursing operation of the drainage tube.

[0040] Compared with the existing method of separately fixing the drainage tubes to the clothes by independently sticking them with tape, the fixing device of the present embodiment can directly clamp the sub-plate 11 and the bundling half-tube 21 on multiple drainage tubes, and fix the sub-plate 11 (fixed by conventional means such as paper clips and drawstrings) at the opening of the clothes (patient gown), and then splice and slide the two half-locking sleeves 31 onto the drainage tubes, so that the fixed tube locking sleeve 3 can be installed on the bundling tube 2, so that the bundling tube 2 can tighten and fix the drainage tubes, and the fixed tube locking sleeve 3 can be loosened from the bundling tube 2, which is convenient for the movement of the drainage tubes, that is, it is convenient to put on and take off clothes, so that after the drainage tubes are loosened (loosened and fixed) multiple times, the drainage tubes can still be reliably separated and fixed.

[0041] The bundled tube 2 can be squeezed and tightened by the fixed tube sleeve 3 to tighten the drainage tube. In order to facilitate the fixed tube sleeve 3 to be locked with the bundled tube 2 and tighten the drainage tube, the following preferred embodiments are provided.

[0042] like Figure 2 As shown, the bundled half pipe 21 includes an integrally formed semi-flat pipe section 211 and a semi-conical beam section 212, and the diameter of the semi-conical beam section 212 gradually decreases from one end of the semi-flat pipe section 211 to one end of the semi-conical beam section 212 away from the semi-flat pipe section 211;

[0043] The outer wall of the semi-flat pipe section 211 is formed with grooves, so that after the two bundled half-pipes 21 are combined to form a bundled pipe 2, the grooves of the two semi-flat pipe sections 211 form a continuous external thread.

[0044] Specifically, after the sub-plates 11 are butt-jointed to form the fixed plate 1, the corresponding two bundled half-tubes 21 are butt-jointed to form the bundled tube 2, and the outer walls of the semi-flat tube sections 211 at the two bundled half-tubes 21 form complete threads, while the semi-conical bundle sections 212 at the two bundled half-tubes 21 form a complete conical bundle nozzle.

[0045] The drainage tube is placed between the semi-flat tube section 211 and the semi-conical bundle section 212 between the two bundled half tubes 21. At this time, the inner wall diameters of the semi-flat tube section 211 and the semi-conical bundle section 212 are both larger than the diameter of the drainage tube, so that the bundled tube 2 and the fixed plate 1 can move relative to the drainage tube, that is, when the fixed tube locking sleeve 3 is not locked, the fixed plate 1 and the bundled tube 2 can move freely on the drainage tube, thereby not affecting the putting on and taking off of clothes (patient gowns), such as going to the toilet, etc.

[0046] Similarly, if Figure 2 As shown, the half locking sleeve 31 includes an integrally formed half flat sleeve section 311 and a half inner cone section 312, and the inner wall diameter of the half inner cone section 312 gradually decreases from the inner wall of one end of the half inner cone section 312 close to the half flat sleeve section 311 to the inner wall of the end of the half inner cone section 312 away from the half flat sleeve section 311, and the slope of the half inner cone section 312 is greater than the slope of the half cone section 212;

[0047] Among them, the inner wall of the semi-flat sleeve section 311 is formed with grooves, so that after the two half locking sleeves 31 form a fixed pipe locking sleeve 3, the grooves of the two semi-flat sleeve sections 311 form a continuous internal thread, and the internal thread formed by the two semi-flat sleeve sections 311 matches the external thread formed by the two semi-flat pipe sections 211.

[0048] Specifically, after the fixing plate 1 and the bundled tube 2 limit the position of the drainage tube, the two half locking sleeves 31 can be spliced ​​in advance and put on the drainage tube, and the diameters of the half flat sleeve section 311 and the half inner cone section 312 of the two half locking sleeves 31 are larger than the diameter of the drainage tube, so that the fixed tube locking sleeve 3 formed after splicing can slide on the drainage tube.

[0049] After the tube-fixing locking sleeve 3 is slid onto the bundled tube 2, the complete threads formed by the semi-flat sleeve sections 311 of the two half-locking sleeves 31 match the complete threads formed by the semi-flat tube sections 211 of the two bundled half-tubes 21, so that the tube-fixing locking sleeve 3 can move axially when it is rotated.

[0050] Since the slope of the semi-inner cone section 312 is greater than the slope of the semi-cone bundle section 212 , the two semi-inner cone sections 312 can gradually squeeze the two semi-cone bundle sections 212 , so that the two semi-cone bundle sections 212 can press and fix the drainage tube.

[0051] Based on the above, in order to ensure that the two bundled half-tubes 21 are firmly connected, the following preferred embodiments are provided.

[0052] like Figure 2As shown, a plurality of clamping columns 213 and a plurality of clamping grooves 214 are arranged on the butt joint surfaces of the two bundled half-tubes 21 constituting the bundled tube 2, and the plurality of clamping columns 213 and the plurality of clamping grooves 214 on the same bundled half-tube 21 are arranged alternately;

[0053] The plurality of clamping posts 213 and the plurality of clamping slots 214 on the two bundled half-tubes 21 are arranged in an alternating manner and in an opposite manner, so that the plurality of clamping posts 213 and the plurality of clamping slots 214 on the two bundled half-tubes 21 are aligned and matched one by one.

[0054] Specifically, a clamping column 213 and a clamping groove 214 are provided on the docking surface of the bundled half-tube 21, so that when the two bundled half-tubes 21 are docked, the clamping column 213 is inserted into the aligned clamping groove 214, so that the two bundled half-tubes 21 can be accurately docked, thereby ensuring that the thread formed by the two semi-flat pipe sections 211 has a higher precision, so that the fixed pipe locking sleeve 3 can be accurately matched and installed.

[0055] Furthermore, since the two bundled half-tubes 21 are connected by staggered plugging through the clamping columns 213 and the clamping grooves 214 , it is difficult for the two bundled half-tubes 21 to be horizontally staggered and separated, thereby increasing the firmness of the fixing plate 1 and the bundled tube 2 .

[0056] The two sub-plates 11 are spliced ​​to form the fixed plate 1 by means of the same plug-in posts 213 and slots 214 , and the posts 213 and slots 214 are interference fit.

[0057] Furthermore, in order to improve the firmness of the bundling tube 2 in binding and fixing the drainage tube, the following preferred embodiments are provided.

[0058] like Figure 2 As shown, a plurality of anti-skid rubber pads 215 are provided on the inner wall of the bundled half-tube 21 , and a plurality of anti-skid rubber pads 215 are provided on the semi-conical bundle section 212 .

[0059] Specifically, after the semi-conical beam segments 212 of the two bundled half-tubes 21 are squeezed by the semi-inner cone segments 312 of the two half-locking sleeves 31, the two semi-conical beam segments 212 are retracted inward, thereby pressing the multiple anti-slip rubber pads 215 against the outer wall of the drainage tube to enhance the fixing effect and prevent the drainage tube from axial movement.

[0060] The two half locking sleeves 31 can be butt-jointed and assembled to form the pipe-fixing locking sleeve 3 . A preferred embodiment for facilitating the butt-jointed and assembled two half locking sleeves 3 is provided below.

[0061] like Figure 2 As shown, a plurality of slide grooves 313 and a plurality of slide plates 314 are respectively provided on the butt joint surfaces of the two half lock sleeves 31 constituting the fixed pipe lock sleeve 3. The slide groove 313 is formed with a large notch 315 and a small notch 316 which are interconnected at its notch, and a limit plate 317 is provided at the end of the slide plate 314;

[0062] The limiting plate 317 can be inserted into the sliding groove 313 from the large notch 315 and slide, and the sliding plate 314 can slide in the small notch 316 .

[0063] Specifically, a slide groove 313 is provided on the docking surface of one of the half lock sleeves 31 constituting the fixed pipe lock sleeve 3, and a slide plate 314 is provided on the docking surface of the other half lock sleeve 31, and the slide plate 314 can be inserted into the slide groove 313 for docking.

[0064] The end of the slide plate 314 is provided with a limit plate 317, and the slot of the slide groove 313 is divided into a large slot 315 and a small slot 316. The limit plate 317 can be inserted from the large slot 315 and slide in the slide groove 313, but cannot be pulled out from the small slot 316. After the limit plate 317 is inserted into the large slot 315, the two half locking sleeves 31 are pushed axially in opposite directions to complete the locking, thereby rotating the fixed tube locking sleeve 3 on the binding tube 2, and the fixed tube locking sleeve 3 cannot be stretched open to squeeze the binding tube 2 to tighten the drainage tube.

[0065] When the tube locking sleeve 3 is threadedly screwed onto the bundle tube 2, the tube locking sleeve 3 engaged by the thread cannot move axially, so that after the tube locking sleeve 3 is installed on the bundle tube 2, the tube locking sleeve 3 cannot be removed, thereby ensuring the reliability of fixing the drainage tube.

[0066] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A multiple drainage tube fixing device, characterized in that: include: A fixing plate (1), the fixing plate (1) comprising two detachably connected sub-plates (11), the two sub-plates (11) being capable of being butted and fixed at the opening of clothing, and the butting surfaces of the two sub-plates (11) being penetrated by a plurality of equally spaced arc grooves (12), and the plurality of relatively opposed arc grooves (12) being capable of butting to form a plurality of equally spaced circular holes to separate and limit the plurality of drainage tubes; A plurality of bundled tubes (2), wherein the plurality of bundled tubes (2) are arranged on the fixed plate (1), and the bundled tubes (2) are composed of two detachably connected bundled half-tubes (21), wherein the bundled half-tubes (21) are arranged on the outer edge of the arc-shaped groove (12) and are integrally formed with the sub-plate (11); A plurality of fixed pipe locking sleeves (3), wherein the plurality of fixed pipe locking sleeves (3) are respectively threadedly mounted on the plurality of bundled pipes (2), and the fixed pipe locking sleeves (3) are composed of two detachably connected half locking sleeves (31), and the two half locking sleeves (31) can be axially slidably engaged or unlocked after docking; The tube fixing locking sleeve (3) which is pre-engaged and mounted on the drainage tube can be threadedly mounted on the binding tube (2) so that the binding tube (2) can tighten and fix the drainage tube to limit the movement of the drainage tube between the two arc-shaped grooves (12).

2. A multiple drainage tube fixing device according to claim 1, characterized in that: The bundled half-tube (21) comprises an integrally formed semi-flat tube section (211) and a semi-conical bundle section (212), and the diameter of the semi-conical bundle section (212) gradually decreases from one end of the semi-flat tube section (211) close to the semi-flat tube section (211) to one end of the semi-conical bundle section (212) far from the semi-flat tube section (211); The outer wall of the semi-flat pipe section (211) is formed with grooves, so that after the two bundled half-pipes (21) form the bundled pipe (2), the grooves of the two semi-flat pipe sections (211) form a continuous external thread.

3. A multiple drainage tube fixing device according to claim 2, characterized in that: The semi-locking sleeve (31) comprises an integrally formed semi-flat sleeve section (311) and a semi-inner cone section (312), and the diameter of the inner wall of the semi-inner cone section (312) gradually decreases from the inner wall of one end close to the semi-flat sleeve section (311) to the inner wall of one end of the semi-inner cone section (312) away from the semi-flat sleeve section (311), and the slope of the semi-inner cone section (312) is greater than the slope of the semi-cone beam section (212); The inner wall of the semi-flat sleeve section (311) is formed with grooves, so that after the two semi-locking sleeves (31) form the fixed pipe locking sleeve (3), the grooves of the two semi-flat sleeve sections (311) form a continuous internal thread, and the internal thread formed by the two semi-flat sleeve sections (311) matches the external thread formed by the two semi-flat pipe sections (211).

4. A multiple drainage tube fixing device according to claim 2 or 3, characterized in that: A plurality of clamping columns (213) and a plurality of clamping grooves (214) are arranged on the butt joint surfaces of the two bundled half-tubes (21) constituting the bundled tube (2), and the plurality of clamping columns (213) and the plurality of clamping grooves (214) on the same bundled half-tube (21) are arranged in a staggered manner; The plurality of clamping columns (213) and the plurality of clamping slots (214) on the two bundled half-tubes (21) are arranged in an alternating manner and in an opposite manner, so that the plurality of clamping columns (213) and the plurality of clamping slots (214) on the two bundled half-tubes (21) are aligned and matched one by one.

5. A multiple drainage tube fixing device according to claim 4, characterized in that: A plurality of anti-slip rubber pads (215) are arranged on the inner wall of the bundled half-tube (21), and the plurality of anti-slip rubber pads (215) are arranged on the semi-conical bundle section (212).

6. A multiple drainage tube fixing device according to claim 5, characterized in that: A plurality of slide grooves (313) and a plurality of slide plates (314) are respectively arranged on the butt joint surfaces of the two half lock sleeves (31) constituting the fixed pipe lock sleeve (3); a large notch (315) and a small notch (316) communicating with each other are formed at the notch of the slide groove (313); and a limit plate (317) is arranged at the end of the slide plate (314); The limiting plate (317) can be inserted into the sliding groove (313) from the large notch (315) and slide, and the sliding plate (314) can slide in the small notch (316).

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