Breathing mask convenient to take and wear

Abstract

The utility model relates to a breathing mask convenient to take and wear, which comprises a mask body, two sides of the mask body are provided with corresponding air suction ports, and the middle part of the lower side of the mask body is provided with a corresponding air outlet; the wearing assembly is used for fixing the mask body on the face of a human body and comprises a wearing rope; the swing limiting part is rotatably mounted on the front side of the mask body and used for mounting the wearing rope in a matched manner and conveniently adjusting the tightness of the wearing rope; the wearing rope sequentially and movably penetrates through the left side of the mask body, is fixedly connected with the swing limiting piece and movably penetrates through the right side of the mask body, and the two ends of the wearing rope are connected with each other after being wound around the head; after the swing limiting piece rotates in place clockwise, the wearing rope is in a tensioned state, and after the swing limiting piece rotates in place anticlockwise, the wearing rope is in a loose state. According to the breathing mask, the taking and wearing convenience of the breathing mask can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of respiratory mask technology, specifically to a respiratory mask that is easy to put on and take off. Background Technology

[0002] A breathing mask is a specialized breathing device that protects the human respiratory organs from damage caused by toxic gases in the outside world. It removes organic vapors, inorganic and acidic gases, as well as toxic and harmful gases, vapors, and fumes such as ammonia, through adsorption, absorption, catalysis, and direct filtration by a filtration device, and is used by personnel in industrial and mining enterprises in oxygen-sufficient environments.

[0003] The breathing mask primarily uses an adjustment buckle on the wearing strap for connecting and adjusting the length of the strap, thereby adjusting the tightness to secure and remove the mask. Each time the mask is removed, the wearing strap needs to be stretched or loosened, or the buckle and adjuster need to be removed. However, the adjustment buckle is mainly located at the back of the head, making it inconvenient for the wearer to put it on with their hand behind their back. Furthermore, when putting the mask back on, the tightness of the wearing strap needs to be readjusted depending on its position on the head. This method of wearing the mask is not convenient enough for situations requiring temporary removal for short breaks or frequent donning and doffing during use.

[0004] Therefore, the research objective of this utility model is to design a breathing mask that can effectively improve the ease of wearing and taking off. Utility Model Content

[0005] In view of the technical problems existing in the prior art, the present invention provides a convenient respirator that can be easily put on and taken off, which can effectively solve the technical problems existing in the prior art.

[0006] The technical solution of this utility model is:

[0007] A convenient respirator includes:

[0008] The mask body has corresponding air inlets on both sides and a corresponding air outlet in the lower center.

[0009] Wearing components for securing the mask body to a human face, including wearing straps;

[0010] A swing limiter is rotatably mounted on the front side of the mask body to cooperate with the installation of the wearing strap and facilitate the adjustment of the tightness of the wearing strap. The wearing strap can be movably inserted through the left side of the mask body, fixedly connected to the swing limiter, and movably inserted through the right side of the mask body, with its two ends respectively wrapped around the head and connected to each other. When the swing limiter is rotated clockwise to its position, the wearing strap is in a taut state; when the swing limiter is rotated counterclockwise to its position, the wearing strap is in a slack state.

[0011] A corresponding one-way valve is movably installed on the outer side of the air outlet on the mask body. The one-way valve can open outward when exhaling and close when inhaling. A sealing elastomer is installed on the edge of the mask body near the face to improve the sealing performance. The edge of the sealing elastomer is folded inward.

[0012] The outer side of the mask body is detachably and fixedly fitted with a protective housing for covering and protecting the air outlet and one-way valve plate. The swing limiter is rotatably mounted on the protective housing. The lower or front side of the protective housing is provided with a vent hole that connects its inner and outer sides. When the vent hole is located on the front side of the protective housing, the outer side of the vent hole is integrally formed and fixed with guide strips spaced from top to bottom, and the guide strips are gradually inclined downward from the inside to the outside.

[0013] The swing limiting member is U-shaped or V-shaped, and corresponding connecting posts are integrally formed and fixed to the inner sides of its two ends. The protective shell has corresponding embedding holes recessed inward on both sides. The connecting posts are respectively installed in the embedding holes, and the swing limiting member is rotatably installed on the protective shell. When the swing limiting member is rotated clockwise to the rear side of the vertical line, the angle between the swing limiting member and the vertical line where its hinge point is located is an acute angle not greater than 45°.

[0014] The swing limiting component includes a connecting body and integrally formed upward protrusions on both sides of the connecting body. The protrusions cooperate with the connecting body to form corresponding guide grooves for limiting and accommodating the wearing cord.

[0015] At least one set of connecting components for connecting the wearing cord is provided at the lower middle part of the connecting body. The connecting components include two elongated holes that penetrate the upper and lower end faces of the connecting body. The wearing cord is fixed by alternately inserting itself into the elongated holes.

[0016] At least one set of limiting and fixing components is provided between the swing limiting component and the protective shell for limiting and fixing the swing limiting component after it has been rotated clockwise to the position. The limiting and fixing components include two wedges that are respectively fixed to the swing limiting component and the protective shell. After the swing limiting component has been rotated clockwise to the position, the two corresponding wedges overlap each other to limit and fix the swing limiting component.

[0017] The protective housing and the face mask body are provided with a fastening assembly and a second fastening assembly for detachably installing the protective housing. The fastening assembly includes a fastening base and a fastening member respectively fixed to the upper side of the face mask body and the protective housing. The second fastening assembly includes a fastening protrusion and a fastening V-shaped member respectively fixed to the lower side of the face mask body and the protective housing. The fastening base snaps the fastening member from top to bottom, and the fastening V-shaped member snaps the fastening protrusion from bottom to top.

[0018] The upper side of the protective shell has a set of symmetrical through holes, and the wearing straps are movably inserted through the through holes. The protective shell has a set of symmetrical connecting holes below the through holes, and the connecting holes are respectively connected to the corresponding second wearing straps. The ends of the wearing straps are connected by corresponding adjusting buckles or by adjusting buckles and headrests. The headrests are connected to the ends of the corresponding wearing straps by corresponding adjusting buckles, and the ends of the two second wearing straps are also connected by corresponding adjusting buckles.

[0019] The upper side of the mask body is provided with a positioning block for positioning and installing the protective shell, and the protective shell is provided with a positioning through hole that matches the shape of the positioning block; the protective shell is provided with a limiting plate for limiting and abutting the swing limiting member, and the limiting plate is integrally formed by extending downward from the end of the fastening V-shaped member.

[0020] Advantages of this utility model:

[0021] 1) Through structural optimization and improvement, this utility model has a corresponding swing limiting component movably installed on the front side of the mask body to adjust the tightness of the front end of the wearing strap connected to the head. Thus, without disassembling the adjustment buckle or adjusting the tightness of the wearing strap, and without changing the wearing position of the wearing strap on the head, the tightness of the wearing strap can be quickly and conveniently adjusted by rotating the swing limiting component clockwise or counterclockwise. This enables the mask body to be quickly and temporarily removed and reset, further effectively improving the convenience of wearing and removing the breathing mask.

[0022] The mask body is detachably fitted with a protective shell to ensure protection of the one-way valve for breathing. Through structural improvements to the protective shell and the addition of a swing limiter, the wearing strap is installed by sequentially inserting into the left through-hole of the swing limiter, fixing it to the swing limiter, and then inserting into the right through-hole. After the mask is worn, the tension of the wearing strap is changed by adjusting the rotation angle of the swing limiter. When the swing limiter rotates clockwise to its vertical position, the wearing strap between the swing limiter and the through-hole is taut; when it rotates counterclockwise, the wearing strap between the swing limiter and the through-hole is slack, and the mask can be pulled outwards from the face along the wearing strap through the through-hole. The adjustment method is simpler, and the swing limiter's front-mounted position makes operation more convenient.

[0023] 2) In this invention, a swing limiting component is rotatably installed on the outside of the protective shell. The wearing cord passes through the left through hole, is fixedly connected to the swing limiting component, and passes through the right through hole in sequence. After wrapping around the head, the two ends are connected to each other. After the swing limiting component is rotated clockwise to its position, the wearing cord is stretched and tightened along the guide groove on the swing limiting component. After the swing limiting component is rotated counterclockwise to its position, the wearing cord is released from the guide groove and becomes relaxed. The breathing mask is movably connected to the wearing cord through the through hole. Thus, the breathing mask can be pulled outward along the relaxed wearing cord through the through hole without affecting the connection of the wearing cord at the back of the head. Therefore, when re-wearing the mask, simply place the breathing mask on the face and rotate the swing limiting component clockwise to tighten the wearing cord and fix the breathing mask in place. There is no need to adjust the length of the wearing cord with an adjustment buckle, further ensuring and improving the practical effect of this invention.

[0024] 3) This utility model provides at least one set of elongated holes at the lower center of the swing limiter for connecting the wearing cord and the swing limiter. Preferably, there are three sets of symmetrical elongated holes. The wearing cord is connected and fixed by alternating vertical penetration. Alternatively, existing fixing methods such as bonding or bolting can be used to fix the wearing cord to the middle of the swing limiter. This ensures that the middle of the wearing cord is fixedly connected to the lower center of the swing limiter when the swing limiter rotates. Compared with existing fixing methods, the connection method of the wearing cord and the swing limiter in this utility model improves the flexibility and ease of installation of the wearing cord.

[0025] 4) Based on the addition of the swing limiting member mentioned above, this utility model further provides a corresponding fixing component between the swing limiting member and the protective shell. The fixing component can be a wedge block fixed to the swing limiting member and the protective shell respectively. The swing limiting member is fixed by the two wedge blocks overlapping each other. This can not only ensure that the swing limiting member is firmly fixed to prevent loosening and ensure the use effect, but also allow external force to be applied easily and quickly to disengage the connection between the two wedge blocks so that the swing limiting member can rotate, further ensuring the practical effect of this utility model. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Figure 2 This is a side view of the present invention.

[0028] Figure 3 for Figure 1 The longitudinal section view.

[0029] Figure 4 for Figure 1 A schematic diagram of the structure of the face mask body and the protective shell.

[0030] Figure 5 for Figure 1 Diagram showing the usage state when the strap is installed.

[0031] Figure 6 for Figure 4 A schematic diagram showing the usage status of the wearing cord during the counterclockwise rotation of the connecting component.

[0032] Figure 7 for Figure 4 A schematic diagram showing the wearing state of the strap when the connecting piece is rotated counterclockwise to the correct position.

[0033] Figure 8 for Figure 7 A side view diagram.

[0034] In the attached diagram: 1. Mask body, 101. Inhalation port, 102. Positioning block, 103. Wearing strap, 2. Swing limiting component, 3. Connecting post, 301. Connecting body, 302. Protruding edge, 303. Sealing elastic body, 4. Protective shell, 5. Ventilation hole, 501. Embedding hole, 502. Through hole, 503. Connecting hole, 504. Positioning through hole, 505. Long strip hole, 6. Wedge block, 7. Second wearing strap, 8. Fastening base, 9. Fastening component, 10. Fastening protrusion, 11. Fastening V-shaped component, 12. Limiting plate, 13. Detailed Implementation

[0035] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:

[0036] refer to Figure 1-8 A convenient respirator, comprising:

[0037] The mask body 1 has corresponding air inlets 101 on both sides and a corresponding air outlet 102 in the lower middle part.

[0038] Wearing components for securing the mask body 1 to a human face, including wearing straps 2;

[0039] The swing limiting member 3 is rotatably installed on the front side of the mask body 1, and is used to cooperate in installing the wearing rope 2 and to conveniently adjust the tightness of the wearing rope 2; the wearing rope 2 can be movably inserted through the left side of the mask body 1, fixedly connected to the swing limiting member 3, and movably inserted through the right side of the mask body 1, and its two ends are respectively wrapped around the head and connected to each other; after the swing limiting member 3 is rotated clockwise to the position, the wearing rope is in a tense state, and after the swing limiting member 3 is rotated counterclockwise to the position, the wearing rope is in a relaxed state.

[0040] A corresponding one-way valve is movably installed on the outer side of the air outlet 102 on the mask body 1. The one-way valve can open outward when exhaling and close when inhaling. A sealing elastomer 4 to improve the sealing performance is installed on the edge of the mask body 1 near the face. The edge of the sealing elastomer 4 is folded inward.

[0041] The outer side of the mask body 1 is detachably and fixedly equipped with a protective housing 5 for covering and protecting the air outlet 102 and the one-way valve plate. The swing limiting member 3 is rotatably installed on the protective housing 5. The lower or front side of the protective housing 5 is provided with a vent 501 that connects its inner and outer sides. When the vent 501 is provided on the front side of the protective housing 5, the outer side of the vent 501 is integrally formed and fixed with guide strips spaced from top to bottom, and the guide strips are gradually inclined downward from the inside to the outside.

[0042] This utility model, through structural optimization and improvement, has a corresponding swing limiting component 3 movably installed on the front side of the mask body 1 to adjust the tightness of the front end of the wearing strap 2 connected to the head. Thus, without disassembling the adjusting buckle or adjusting the tightness of the wearing strap 2, and without changing the wearing position of the wearing strap 2 on the head, the tightness of the wearing strap 2 can be quickly and conveniently adjusted by rotating the swing limiting component 3 clockwise or counterclockwise. This enables the mask body 1 to be quickly and temporarily removed and reset, further effectively improving the convenience of wearing and removing the breathing mask.

[0043] A protective shell 5 is detachably installed on the front side of the mask body 1. This ensures protection of the one-way valve plate used for breathing. Through structural improvements to the protective shell 5 and the addition of a swing limiter 3, the wearing strap 2 is installed by sequentially inserting into the left through hole 503 of the swing limiter 3, fixing it to the swing limiter 3, and then inserting into the right through hole 503. After the mask is worn, the tightness of the wearing strap 2 can be changed simply by adjusting the rotation angle of the swing limiter 3. When the swing limiter 3 rotates clockwise to its position (behind the vertical line), the wearing strap 2 between the swing limiter 3 and the through hole 503 is taut. When the swing limiter 3 rotates counterclockwise to its position, the wearing strap 2 between the swing limiter 3 and the through hole 503 is slack. The mask can then be pulled outwards from the face along the wearing strap 2 through the through hole 503. The adjustment method is simpler, and the swing limiter 3's front-mounted location makes operation more convenient.

[0044] The swing limiting member 3 is U-shaped or V-shaped, and its two ends are integrally formed and fixed with corresponding connecting posts 301. The protective shell 5 has corresponding embedding holes 502 recessed inward on both sides. The connecting posts 301 are respectively installed in the embedding holes 502, and the swing limiting member 3 is rotatably installed on the protective shell 5. When the swing limiting member 3 is rotated clockwise to the rear side of the vertical line, the angle between the swing limiting member 3 and the vertical line where its hinge point is located is an acute angle not greater than 45°.

[0045] The swing limiting member 3 includes a connecting body 302 and integrally formed upward protruding edges 303 on both sides of the connecting body 302. The protruding edges 303 cooperate with the connecting body 302 to form corresponding guide grooves for limiting and accommodating the wearing cord 2.

[0046] This invention features a swing limiting member 3 rotatably mounted on the outside of the protective shell 5. The wearing strap 2 passes through the left through hole 503, is fixedly connected to the swing limiting member 3, and passes through the right through hole 503 in sequence. After wrapping around the head, the two ends are connected to each other. After the swing limiting member 3 rotates clockwise to its position, the wearing strap 2 is stretched and tightened along the guide groove on the swing limiting member 3. After the swing limiting member 3 rotates counterclockwise to its position, the wearing strap 2 is released from the guide groove and becomes relaxed. The breathing mask is movably connected to the wearing strap 2 through the through hole 503. Thus, the breathing mask can be pulled outward along the relaxed wearing strap 2 through the cooperation of the through hole 503 without affecting the connection of the wearing strap 2 at the back of the head. Therefore, when re-wearing the mask, simply place the breathing mask on the face and rotate the swing limiting member 3 clockwise to tighten the wearing strap and fix the breathing mask in place. There is no need to adjust the length of the wearing strap 2 through the adjustment buckle, further ensuring and improving the practical effect of this invention.

[0047] The lower middle part of the connecting body 302 is provided with at least one set of connecting components for connecting the wearing cord 2. The connecting components include two elongated holes 6 that penetrate the upper and lower end faces of the connecting body 302. The wearing cord 2 is fixed by alternately inserting itself into the elongated holes 6.

[0048] This invention provides at least one set of elongated holes 6 at the lower center of the swing limiter 3 for connecting the wearing cord 2 and the swing limiter 3. Preferably, there are three sets of symmetrical elongated holes 6, which are used to connect and fix the wearing cord 2 by alternating vertical penetration. Alternatively, existing fixing methods such as adhesive bonding or bolt tightening can be used to fix the wearing cord 2 to the middle of the swing limiter 3. This ensures that when the swing limiter 3 rotates, the middle of the wearing cord 2 is fixedly connected to the lower center of the swing limiter 3. Compared with existing fixing methods, the connection method of the wearing cord 2 and the swing limiter 3 in this invention improves the flexibility and ease of installation of the wearing cord 2.

[0049] At least one set of limiting and fixing components is provided between the swing limiting member 3 and the protective shell 5 for limiting and fixing the swing limiting member 3 after it has been rotated clockwise to the position. The limiting and fixing components include two wedges 7 respectively fixed to the swing limiting member 3 and the protective shell 5. After the swing limiting member 3 has been rotated clockwise to the position, the two corresponding wedges 7 overlap each other to limit and fix the swing limiting member 3.

[0050] Based on the addition of the swing limiting member 3, this utility model further provides a corresponding fixing component between the swing limiting member 3 and the protective shell 5. The fixing component can be a wedge 7 fixed to the swing limiting member 3 and the protective shell 5 respectively. The swing limiting member 3 is fixed by the two wedges 7 overlapping each other. This can not only ensure that the swing limiting member 3 is firmly fixed to prevent loosening and ensure the use effect, but also allow external force to be applied easily and quickly to disengage the connection between the two wedges 7 so that the swing limiting member 3 can rotate, further ensuring the practical effect of this utility model.

[0051] The protective housing 5 and the mask body 1 are provided with a fastening assembly and a second fastening assembly for detachably installing the protective housing 5. The fastening assembly includes a fastening base 9 and a fastening member 10 respectively fixed to the upper side of the mask body 1 and the protective housing 5. The second fastening assembly includes a fastening protrusion 11 and a fastening V-shaped member 12 respectively fixed to the lower side of the mask body 1 and the protective housing 5. The fastening base 9 fastens the fastening member 10 from top to bottom, and the fastening V-shaped member 12 fastens the fastening protrusion 11 from bottom to top.

[0052] The protective shell 5 has a set of symmetrically arranged through holes 503 on its upper side. The wearing straps 2 are movably inserted through the through holes 503. The protective shell 5 has a set of symmetrically arranged connecting holes 504 below the through holes 503. The connecting holes 504 are respectively connected to the corresponding second wearing straps 8. The ends of the wearing straps 2 are connected by corresponding adjusting buckles or by adjusting buckles and headrests. The headrests are connected to the ends of the corresponding wearing straps 2 by corresponding adjusting buckles. The ends of the two second wearing straps 8 are also connected by corresponding adjusting buckles.

[0053] The upper side of the mask body 1 is provided with a positioning block 103 for positioning and installing the protective housing 5. The protective housing 5 is provided with a positioning through hole 505 that matches the shape of the positioning block 103. The protective housing 5 is provided with a limiting plate 13 for limiting and abutting the swing limiting member 3. The limiting plate 13 is integrally formed by extending downward from the end of the fastening V-shaped member 12.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A respirator that is easy to put on and take off, characterized in that, The utility model provides a face mask, including: The both sides of face mask body (1) are provided with corresponding air inlet (101), and the lower middle part is provided with a corresponding air outlet (102); Wearing component is used for fixing face mask body (1) on human face, and it includes wearing rope (2); Swing limiting piece (3) is rotatably installed on the front side of face mask body (1) and is used for installing wearing rope (2) and conveniently adjusting the tightness of wearing rope (2);The wearing rope (2) is successively movably inserted into the left side of face mask body (1), fixedly connected swing limiting piece (3), movably inserted into the right side of face mask body (1), and the both ends are connected with each other around the head;When swing limiting piece (3) rotates clockwise to the position, the wearing rope is in tension, and when swing limiting piece (3) rotates counterclockwise to the position, the wearing rope is in relaxation.

2. A respirator according to claim 1, wherein, The outer side of face mask body (1) movably installs corresponding one-way valve piece on the outer side of air outlet (102), and the one-way valve piece can be opened outward when exhaling, and closed when inhaling;The edge of the side close to human face on face mask body (1) is installed with sealing elastomer (4) for improving the sealing performance of wearing, and the edge of sealing elastomer (4) is inwardly folded.

3. A respiratory mask according to claim 2, wherein, The outer side of face mask body (1) is detachably fixedly installed with protective shell (5) for covering and protecting air outlet (102) and one-way valve piece, and swing limiting piece (3) is rotatably installed on protective shell (5);The lower side or the front side of protective shell (5) is provided with air hole (501) communicating the inner and outer sides thereof, when air hole (501) is arranged on the front side of protective shell (5), the outer side of air hole (501) is integrally formed and fixedly connected with guide partition strips arranged from top to bottom at intervals, and the guide partition strips are gradually inclined downward from inside to outside.

4. A respiratory mask according to claim 3, wherein, Swing limiting piece (3) is arranged in U-shaped or V-shaped structure, and corresponding connecting columns (301) are integrally formed and fixedly connected to the opposite inner sides of both ends, the both sides of protective shell (5) are recessed inwardly and provided with corresponding embedding holes (502), and swing limiting piece (3) is rotatably installed on protective shell (5) by being correspondingly installed in embedding holes (502) through connecting columns (301);When swing limiting piece (3) rotates clockwise to the position, i.e.

5. The respirator of claim 1, wherein, Swing limiting piece (3) includes connection body (302) and convex edges (303) integrally formed and arranged upwardly on both sides of connection body (302), and convex edges (303) and connection body (302) form corresponding guide grooves for limiting and accommodating wearing rope (2).

6. A respiratory mask according to claim 5, wherein, The lower middle of the connecting body (302) is provided with at least one set of connecting components for connecting the wearing ropes (2), which includes two long holes (6) penetrating the upper and lower surfaces of the connecting body (302), and the wearing ropes (2) are fixed by being alternately inserted into the long holes (6) in sequence.

7. A respiratory mask according to claim 3, wherein, At least one set of limiting components for limiting the swing limiting member (3) after clockwise rotation is arranged between the swing limiting member (3) and the protective shell (5), which includes two wedge blocks (7) respectively fixed on the swing limiting member (3) and the protective shell (5); after the swing limiting member (3) is rotated clockwise to the position, the two corresponding wedge blocks (7) are overlapped to limit the swing limiting member (3).

8. A respiratory mask according to claim 3, wherein, The upper and lower sides between the protective shell (5) and the mask body (1) are provided with a buckle assembly and a second buckle assembly for detachably mounting the protective shell (5), the buckle assembly includes a buckle base (9) and a buckle piece (10) respectively fixed on the upper side of the mask body (1) and the protective shell (5), and the second buckle assembly includes a buckle convex plate (11) and a buckle V-shaped piece (12) respectively fixed on the lower side of the mask body (1) and the protective shell (5), the buckle base (9) buckles the buckle piece (10) from top to bottom, and the buckle V-shaped piece (12) buckles the buckle convex plate (11) from bottom to top.

9. A respiratory mask according to claim 3, wherein, The upper side of the protective shell (5) is provided with a corresponding through hole (503) symmetrically arranged on the left and right sides, the wearing ropes (2) are respectively movably inserted into the through holes (503), a set of connection holes (504) symmetrically arranged on the left and right sides are arranged below the through holes (503) on the protective shell (5), and the second wearing ropes (8) are respectively connected to the connection holes (504); the ends of the wearing ropes (2) are connected through corresponding adjusting buckles or are connected through adjusting buckles and head supports, the head supports are connected to the ends of the corresponding wearing ropes (2) through corresponding adjusting buckles, and the ends of the two second wearing ropes (8) are also connected through corresponding adjusting buckles.

10. A respiratory mask according to claim 8, wherein, The upper side of the mask body (1) is provided with a positioning block (103) for positioning and mounting the protective shell (5), and the protective shell (5) is provided with a positioning through hole (505) matched with the shape of the positioning block (103); the protective shell (5) is provided with a limiting plate (13) for limiting and abutting the swing limiting member (3), and the limiting plate (13) is integrally formed by extending downward from the end of the buckle V-shaped piece (12).

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