Magnetic type quick release buckle with sliding locking function

Abstract

The invention provides a magnetic type quick release buckle with sliding locking, which comprises a buckle seat, a buckle piece, a locking piece and a locking block, the buckle piece and a hanging rope can be arranged in a V-shaped clamping groove from an opening, in a secondary locking state, the movement of the buckle piece in the vertical direction is limited through a spring bolt part, and the locking block is moved close to the buckle piece by utilizing magnetic connection, so that the buckle piece can be locked quickly. Secondary locking of the spring bolt part is achieved through limiting of the locking block and the bottom wall, when unlocking is needed, the locking block is moved upwards to enter a primary locking state, the pressed part and the spring bolt part can move at the moment, then the spring bolt part is driven to be separated from the fastener to enter an unlocking state, and magnetic connection is utilized to achieve unlocking. The fastener moves towards the wide end of the V-shaped clamping groove under the action of magnetism, the fastener and the hanging rope can be conveniently taken out of the V-shaped clamping groove through separation of the wide end and the matched side wall of the fastener, secondary locking is achieved, and meanwhile convenient and rapid disassembly can be achieved.

Description

Technical Field

[0001] The invention relates to the field of connectors, and in particular to a magnetic quick-release buckle with sliding locking. Background Art

[0002] A buckle refers to a mechanical structure in which one part is embedded and connected with another part or is closed as a whole. It is very common in daily life and is often seen in the ropes of school bags, baby carriers, cameras, etc., where it plays a fixing role. Due to different application scenarios and customer needs, many different types of buckles have been developed, such as push-motion buckles, sliding buckles, magnetic buckles, etc., to meet different usage needs.

[0003] Due to the fragility of the camera itself and its outdoor use, in order to protect the camera and facilitate portability, the camera is mostly carried in the form of a strap. In order to make the strap connection more convenient, a buckle connection is used to connect the camera and the strap. At the same time, the camera will continue to shake during outdoor use and the camera itself has a certain weight, so the buckle is required to have good connection strength to withstand a large pulling force, and the buckle must also have the ability to be easily and quickly disassembled, thereby making the camera and other equipment more flexible in operation. In addition, in order to improve the connection stability, a corresponding secondary locking structure needs to be provided for the buckle to avoid accidental unlocking by the user. Summary of the invention

[0004] The purpose of the present invention is to provide a magnetic quick-release buckle with sliding locking.

[0005] In order to achieve the purpose of the present invention, the present invention provides a magnetic quick-release buckle with sliding locking, including a buckle seat, a buckle, a locking piece and a locking block, the buckle seat is provided with a V-shaped groove, the narrow end of the V-shaped groove is located at the bottom, the wide end of the V-shaped groove is located at the top, the V-shaped groove is provided with a through opening along the vertical bottom of the narrow end, the inner side of the V-shaped groove is provided with a bottom wall, and the outer side of the V-shaped groove is provided with an opening; the buckle is provided with matching side walls on two opposite sides, the matching side walls on both sides are arranged in a V shape, the buckle is provided with a hanging rope between the two matching side walls and at the tip at the bottom, the buckle is provided with a first magnet at the top, the buckle is located in the V-shaped groove, the matching side wall is engaged with the V-shaped groove, and the hanging rope passes through the through opening; the locking piece includes a locking tongue part, a pressure-receiving part and an elastic part, the elastic part is connected to the buckle seat, and the pressure-receiving part is used to drive the locking tongue part inward The lock block is arranged on the lower part, and the second magnet is connected with the first magnet and the second magnet is connected with the second magnet, and the lock block is adjacent to the outer side of the bottom wall, and the lock block limits the movement of the lock tongue part; in the first locking state, the lock block is far away from the fastener, the first magnet is separated from the second magnet, the second magnet is magnetically connected with the magnetically attracted part, and the lock block is separated from the bottom wall; in the unlocking state, the lock tongue part is separated from the fastener, and the fastener moves in the vertical direction toward the wide end of the V-shaped groove under the action of magnetism, and the fastener is close to the lock block, and the first magnet is magnetically connected with the second magnet.

[0006] It can be seen from the above scheme that the buckle and the hanging rope can be loaded into the V-shaped groove from the opening. In the secondary locking state, not only the vertical movement of the buckle is restricted by the lock tongue part, but also the locking block is moved close to the buckle by using the magnetic connection. The secondary locking of the lock tongue part is realized by the limiting of the lock block and the bottom wall, and the matching side wall is used to engage with the V-shaped groove. After the hanging rope is hung with an object, the effect of gravity is used to provide a stable locking force for the buckle. When unlocking is needed, the lock block is first moved upward to enter the primary locking state. At this time, the pressure-bearing part and the lock tongue part can both move, and then the lock tongue part is driven to separate from the buckle, and then enter the unlocking state. By using the magnetic connection, the fastener moves toward the wide end of the V-shaped groove under the action of the magnet, and the wide end is separated from the matching side wall of the fastener. Therefore, the fastener and the hanging rope can be easily taken out from the V-shaped groove, and convenient and quick disassembly can be achieved while achieving secondary locking.

[0007] A further solution is that the elastic part is arranged as an elastic arm, the lock tongue part and the pressure-receiving part are arranged in sequence from bottom to top and are respectively connected to the elastic arms, the elastic arms are connected to the buckle seat, and the pressure-receiving part is located above the buckle.

[0008] As can be seen from the above, through the arrangement of the elastic arm, the pressed portion can conveniently drive the lock tongue portion to unlock, and the lock tongue portion can also be locked and reset quickly and stably.

[0009] A further solution is that a slide groove extending in the vertical direction is provided on the pressure-bearing portion, and a slider extending in the vertical direction is provided on the locking block, and the slider is slidably matched with the slide groove.

[0010] As can be seen from the above, through the sliding cooperation between the slider and the slide groove, the locking block can stably move on the pressure-bearing part and stably switch between the two locking states.

[0011] A further solution is that the magnetically attracted part adopts a third magnet or a ferromagnetic metal part, the magnetically attracted part is located in the middle of the pressure-bearing part, and sliding grooves are respectively provided on both horizontal sides of the magnetically attracted part; the locking block is provided with a matching groove above the second magnet, and sliding blocks are respectively provided on both horizontal sides of the matching groove, and the magnetically attracted part is located in the matching groove.

[0012] As can be seen from the above, the magnetically attracted portion in the middle can stabilize the primary locking position of the lock block, thereby ensuring smooth unlocking by pressing.

[0013] A further solution is that the locking block is provided with a lower limit wall below the matching groove; in the secondary locking state, the lower limit wall is adjacent to the outer side of the bottom wall; in the primary locking state, the lower limit wall is adjacent to the magnetically attracted portion.

[0014] As can be seen from the above, through the limitation of the lower limit wall and the bottom wall, the inward limitation of the pressure-bearing part and the lock tongue part can be stably achieved to avoid accidental unlocking, and through the limitation of the lower limit wall and the magnetically attracted part, the upward movement limitation of the lock block can be achieved to avoid the lock block from detaching.

[0015] A further solution is that the lock includes a back plate, the pressure-bearing part and the lock tongue part are located on the outer side of the back plate, and the elastic arm is connected between the back plate and the pressure-bearing part; the buckle seat is provided with a pressing window above the V-shaped groove, the pressure-bearing part and the lock block are located in the pressing window, and the back plate covers the inner side of the pressing window and is fixedly connected to the buckle seat.

[0016] As can be seen from the above, the arrangement of the back plate not only provides a stable installation for the elastic arm, but also facilitates the assembly and positioning of the lock.

[0017] A further solution is that a back limit block is provided on a side of the matching groove close to the back plate, and the back limit block is adjacent to the back side of the elastic arm.

[0018] As can be seen from the above, the back limiting block and the back side limiting of the elastic arm not only facilitate the assembly and positioning of the locking block, but also prevent the locking block from escaping outwards.

[0019] A further solution is that a through hole is provided through the bottom wall, and the locking tongue portion passes through the through hole from the back side and extends into the V-shaped slot.

[0020] As can be seen from the above, the locking tongue portion passes through the through hole from the back side, and then the upper edge of the through hole is adjacent to the connection portion between the locking tongue portion and the pressure-receiving portion for limiting position.

[0021] A further solution is that a locking groove is provided on the inner side of the fastener, and the locking tongue portion is detachably engaged with the locking groove.

[0022] As can be seen from the above, there are many ways to limit the lock tongue portion. The lock tongue portion can not only limit the upper end of the fastener, but also limit the fastener through the slot.

[0023] A further solution is that the V-shaped slot is provided with locking grooves on two opposite sides, the locking grooves on both sides are arranged in a V shape, and a locking block is provided on each side of the matching side wall, the locking blocks on both sides are arranged in a V shape, and the locking blocks are detachably engaged with the locking grooves.

[0024] As can be seen from the above, the locking force of the fastener can be further improved through the engagement of the locking block with the locking groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of an embodiment of a quick-release buckle of the present invention.

[0026] Figure 2 It is a structural diagram of the quick-release buckle embodiment of the present invention after the hanging strap is omitted.

[0027] Figure 3 It is a structural diagram of an embodiment of the quick-release buckle of the present invention from a back side perspective.

[0028] Figure 4 It is an exploded view of the buckle seat and the buckle in the embodiment of the quick release buckle of the present invention.

[0029] Figure 5 It is an exploded view of the buckle seat in the embodiment of the quick release buckle of the present invention.

[0030] Figure 6 It is an exploded view of the buckle seat in the quick-release buckle embodiment of the present invention from another viewing angle.

[0031] Figure 7 It is a cross-sectional view of an embodiment of the quick-release buckle of the present invention in a secondary locking state.

[0032] Figure 8 It is a cross-sectional view of the quick-release buckle embodiment of the present invention in a primary locking state.

[0033] Fig. 9 It is a cross-sectional view of an embodiment of the quick-release buckle of the present invention in an unlocked state.

[0034] Fig.10 It is a cross-sectional view of an embodiment of the quick-release buckle of the present invention in a disengaged state.

[0035] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0036] Reference Figures 1 to 10 The quick release buckle includes a buckle seat 1, a buckle 2, a locking member 3, a locking block 36 and a rear sticker 35. The buckle seat 1 is provided with a V-shaped groove 11, the narrow end of the V-shaped groove 11 is located at the bottom, and the wide end of the V-shaped groove 11 is located at the top. The V-shaped groove 11 is vertically penetrated with a through opening 113 at the narrow end. The inner side of the V-shaped groove 11 is provided with a bottom wall 114, and the bottom wall 114 is penetrated with a through hole 115. The outer side of the V-shaped groove 11 is provided with an opening. The V-shaped groove 11 is respectively provided with locking grooves 112 on two opposite side walls 111, and the locking grooves 112 on both sides are arranged in a V shape. The buckle seat 1 is provided with a pressing window 117 above the V-shaped groove 11, and the pressing window 117 penetrates along the front-to-back direction. The pressing window 117 is located above the V-shaped groove 11 and is connected to the V-shaped groove 11.

[0037] The buckle seat 1 is provided with a connecting portion 118 above the pressing window 117, and the connecting portion 118 is used to connect the shoulder strap and the strap 101. The buckle seat 1 is provided with a positioning groove 119 above the pressing window 117, and the positioning groove 119 is located on the inner side. A front barrier wall 120 is provided on the outer side of the positioning groove 119.

[0038] The fastener 2 is provided with matching side walls 21 on two opposite sides, and the matching side walls 21 on both sides are arranged in a V-shape and are narrow at the bottom and wide at the top. A locking block 22 is provided on each matching side wall 21, and the locking blocks 22 on both sides are arranged in a V-shape. The fastener 2 is provided with a hanging rope 24 between the two matching side walls 21 and at the tip at the bottom. The fastener 2 is provided with a first magnet 23 at the upper end, and the first magnet 23 faces the locking block 36. The fastener 2 is located in the V-shaped groove 11, and the matching side wall 21 is engaged with the V-shaped groove 11, and the locking block 22 is detachably engaged with the locking groove 112, and the hanging rope 24 passes through the through-opening 113.

[0039] The lock 3 includes a lock tongue portion 31, a pressure-receiving portion 39, an elastic portion and a back plate 34. In the present embodiment, the elastic portion is arranged as an elastic arm 33. The lock tongue portion 31 and the pressure-receiving portion 39 are sequentially connected to the elastic arm 33 from bottom to top. The pressure-receiving portion 39, the lock tongue portion 31 and the elastic arm 33 are located on the outer side of the back plate 34. The elastic arm 33 is arranged in a U shape. The elastic arm 33 is connected between the back plate 34 and the pressure-receiving portion 39. The pressure-receiving portion 39 is arranged as a convex block protruding outward. The pressure-receiving portion 39 is fixedly connected by screws through the through hole 343, and the back plate 34 is fixedly connected to the back of the buckle seat 1 through the through hole 341 and the screws.

[0040] The pressure-receiving portion 39 is located above the buckle 2 and is connected to the buckle seat 1 through the elastic portion. The pressure-receiving portion 39 is used to drive the lock tongue portion 31 to move inward, and the elastic portion is used to drive the lock tongue portion 31 to elastically return to the outside. The pressure-receiving portion 39 is provided with a magnetically attracted portion 391, and the locking block 36 is provided with a second magnet 37 at the bottom. The locking block 36 is connected to the pressure-receiving portion 39 and can move in the vertical direction.

[0041] Specifically, the magnetically attracted part 391 adopts a third magnet or a ferromagnetic metal part, the magnetically attracted part 391 is made of ferromagnetic metal materials such as iron, nickel, and cobalt, or the magnetically attracted part and the pressure-receiving part are integrally formed and arranged, and the pressure-receiving part is made of ferromagnetic metal materials, both of which can realize magnetic connection between the magnetically attracted part and the second magnet.

[0042] The magnetically attracted portion 391 is located below the middle of the pressure receiving portion 39. Slide grooves 392 are respectively provided on the horizontal sides of the magnetically attracted portion 391. The slide grooves 392 extend in the vertical direction. The lock block 36 is provided with a matching groove 361 above the second magnet 37. Slide blocks 362 are respectively provided on the horizontal sides of the matching groove 361. The slide blocks 362 extend in the vertical direction. The magnetically attracted portion 391 and the pressure receiving portion 39 are located in the matching groove 361. The slide blocks 362 slide in cooperation with the slide groove 392. The lock block 36 is provided with a lower limit wall 363 below the matching groove 361. The lower limit wall 363 extends horizontally and is connected between the slide blocks 362 on both sides. The lower limit wall 363 is located on the back side of the second magnet 37. The matching groove 361 is provided with a back limit block 364 on the side close to the back plate 34. The two back limit blocks 364 are respectively located on the horizontal sides of the matching groove 361. The back limit blocks 364 are adjacent to the back side of the elastic arm 33. The pressed portion 39 and the locking block 36 are located in the pressing window 117 , and the back plate 34 covers the inner side of the pressing window 117 and is fixedly connected to the buckle seat 1 .

[0043] The locking tongue portion 31 is arranged to be inclined outward, and extends from the back side through the through hole 115 into the V-shaped groove 11. The fastener 2 is respectively provided with grooves 25 on the inner and outer sides, so that the fastener 2 can be engaged with both sides. When the fastener 2 is located in the V-shaped groove 11 and is in a locked state, the locking tongue portion 31 is engaged with the groove 25. When the buckle 2 is disengaged from the V-shaped slot 11, the upper edge of the through hole 115 is adjacent to the connection portion between the lock tongue portion 31 and the pressure-receiving portion 39, the pressure-receiving portion 39 is located in the pressing window 117, the first magnet is opposite to the second magnet, the elastic arm 33 is located in the positioning slot 119, the elastic arm 33 is adjacent to the front baffle wall 120, the back plate 34 covers the inner side of the pressing window 117 and is fixedly connected to the buckle seat 1, and the back side of the back plate 34 is also fitted with a back sticker 35. By pressing the lock block 36 inwardly, the pressure-receiving portion 39 and the lock tongue portion 31 are driven to move inwardly, and under the elastic recovery of the elastic arm 33, the elastic arm 33 drives the lock tongue portion 31 to elastically reset and move outward. Reference Figure 7When the V-shaped slot 11 is vacant and the fastener 2 is mounted on the V-shaped slot 11, the fastener 2 is pulled downward to engage the mating side wall 21 with the V-shaped slot 11, the locking block 22 engages with the locking slot 112, and the hanging rope 24 passes through the through-hole 113. As the first magnet 23 and the second magnet 37 are magnetically connected, the locking block 36 also moves downward close to the fastener 2. At this time, it is in the secondary locking state, the locking tongue portion 31 engages with the slot 25 of the fastener 2 and restricts the vertical movement of the fastener 2. The first magnet 23 and the second magnet 37 are magnetically connected, and the locking block 36 is adjacent to the outer side of the bottom wall 114, and the lower limit wall 363 is adjacent to the outer side of the bottom wall 114. The movement of the locking tongue portion 31 is restricted by the locking block 36, so that the locking block 36 cannot be pressed inward, thereby realizing the secondary locking function.

[0044] Reference Figure 8 When unlocking is required, it is first necessary to enter a locked state, by driving the lock block 36 to move vertically upward away from the fastener 2, and then the first magnet 23 is separated from the second magnet 37, the second magnet 37 is magnetically connected to the magnetically attracted portion 391, and the lower limit wall 363 is adjacent to the magnetically attracted portion 391. At this time, the lock block 36 is separated from the bottom wall 114, and the lock block 36 can be pressed to unlock.

[0045] Reference Fig. 9 In the unlocked state, by pressing the lock block 36 inward, the pressure-receiving portion 39, the elastic arm 33 and the lock tongue portion 31 are driven inward, and the lock tongue portion 31 is separated from the fastener 2. At this time, the fastener 2 moves in the vertical direction toward the wide end of the V-shaped groove under the action of magnetism, and the fastener 2 moves in the vertical direction upward close to the lock block 36, and the first magnet 23 is magnetically connected to the second magnet 37.

[0046] Reference Fig.10 , and then release the external force of the locking block 36. Under the elastic recovery of the elastic arm 33, the elastic arm 33 drives the locking tongue portion 31 to elastically return to the outside. Then, while maintaining the magnetic contact, the locking tongue portion 31 can drive the fastener 2 to move outward, making it easier for the user to remove the fastener 2.

[0047] Of course, the above embodiments are only preferred embodiments of the present case. In specific applications, more changes can be made. For example, the elastic arm can be directly connected to the buckle seat, which can also apply elastic restoring force to the pressure-bearing part or the lock tongue part, or the elastic part can also be arranged in the form of a spring or a torsion spring, the spring can resist the pressure-bearing part or the lock tongue part, and the torsion spring can also be connected to the pressure-bearing part or the lock tongue part, which can also realize that the elastic part is used to drive the lock tongue part to elastically return to the outside.

[0048] Furthermore, the locking tongue portion and the pressure-receiving portion are arranged in sequence from bottom to top and are respectively connected to the elastic arms, which includes the locking tongue portion being directly or indirectly connected to the elastic arm, or the pressure-receiving portion being directly or indirectly connected to the elastic arm, or another elastic portion, such as a spring or a torsion spring, is used to reset the pressure-receiving portion or the locking tongue portion.

[0049] Furthermore, with regard to the engagement method between the mating side wall and the V-shaped groove, in addition to using inclined grooves and inclined blocks, an outer edge can also be set on the outer side of the V-shaped groove, and the mating side wall can also be limited by the outer edge. The engagement method can be arranged according to actual needs with conventional blocks and grooves. The above-mentioned modifications are all within the protection scope of the present invention.

[0050] As can be seen from the above, the fastener and the lanyard can be loaded into the V-shaped groove from the opening. In the secondary locking state, not only the vertical movement of the fastener is restricted by the lock tongue part, but also the locking block is moved close to the fastener by means of magnetic connection. The secondary locking of the lock tongue part is achieved by limiting the locking block and the bottom wall, and the matching side wall is used to engage with the V-shaped groove. After the lanyard is hung with an object, the effect of gravity is used to provide a stable locking force for the fastener. When unlocking is required, the lock block is first moved upward to enter the primary locking state. At this time, both the pressed part and the lock tongue part can be moved, and then the lock tongue part is driven to separate from the fastener to enter the unlocking state. By means of magnetic connection, the fastener moves toward the wide end of the V-shaped groove under the action of magnetism, and the separation of the wide end and the matching side wall of the fastener is used. Therefore, the fastener and the lanyard can be easily taken out of the V-shaped groove, and convenient and quick disassembly can be achieved while achieving secondary locking.

Claims

1. A magnetic quick-release buckle with sliding lock, characterized in that: include: A buckle seat, wherein the buckle seat is provided with a V-shaped groove, wherein the narrow end of the V-shaped groove is located at the bottom, and the wide end of the V-shaped groove is located at the top, and the V-shaped groove is provided with a through opening vertically running through the narrow end and downward, and the inner side of the V-shaped groove is provided with a bottom wall, and the outer side of the V-shaped groove is provided with an opening; A fastener, wherein the fastener is provided with matching side walls on two opposite sides, the matching side walls on both sides are arranged in a V-shape, the fastener is provided with a hanging rope between the two matching side walls and at the tip below, the fastener is provided with a first magnet on the top, the fastener is located in the V-shaped groove, the matching side walls are engaged with the V-shaped groove, and the hanging rope passes through the through opening; A lock component, the lock component comprising a locking tongue portion, a pressure-receiving portion and an elastic portion, the elastic portion being connected to the buckle seat, the pressure-receiving portion being used to drive the locking tongue portion to move inward, the elastic portion being used to drive the locking tongue portion to elastically return to the outside, and the pressure-receiving portion being provided with a magnetically attracted portion; A locking block, wherein a second magnet is disposed below the locking block, and the locking block is connected to the pressure receiving portion and can move in a vertical direction; In the secondary locking state, the lock tongue portion is adjacent to the buckle and restricts the buckle from moving in the vertical direction, the lock block is close to the buckle, the first magnet is magnetically connected to the second magnet, the lock block is adjacent to the outer side of the bottom wall, and the lock block restricts the movement of the lock tongue portion; In a locked state, the locking block is away from the buckle, the first magnet is separated from the second magnet, the second magnet is magnetically connected to the magnetically attracted portion, and the locking block is separated from the bottom wall; In the unlocked state, the locking tongue portion is separated from the fastener, and the fastener moves vertically toward the wide end of the V-shaped slot under the action of magnetism, the fastener is close to the locking block, and the first magnet is magnetically connected to the second magnet.

2. The quick release buckle according to claim 1, characterized in that: The elastic part is arranged in the form of an elastic arm, the locking tongue part and the pressure-receiving part are arranged in sequence from bottom to top and are respectively connected to the elastic arms, the elastic arms are connected to the buckle seat, and the pressure-receiving part is located above the buckle.

3. The quick release buckle according to claim 2, characterized in that: The pressure receiving portion is provided with a slide groove extending in the vertical direction, and the locking block is provided with a slider extending in the vertical direction, and the slider is slidably matched with the slide groove.

4. The quick release buckle according to claim 3, characterized in that: The magnetically attracted portion is made of a third magnet or a ferromagnetic metal piece, the magnetically attracted portion is located in the middle of the pressure-receiving portion, and the slide grooves are respectively arranged on two horizontal sides of the magnetically attracted portion; The locking block is provided with a matching groove above the second magnet, the matching groove is provided with the sliding blocks on two horizontal sides respectively, and the magnetically attracted portion is located in the matching groove.

5. The quick release buckle according to claim 4, characterized in that: The locking block is provided with a lower limit wall below the matching groove; In the secondary locking state, the lower limit wall is adjacent to the outer side of the bottom wall; In the primary locking state, the lower limit wall is adjacent to the magnetically attracted portion.

6. The quick release buckle according to claim 4, characterized in that: The lock element comprises a back plate, the pressure-bearing portion and the locking tongue portion are located on the outer side of the back plate, and the elastic arm is connected between the back plate and the pressure-bearing portion; The buckle seat is provided with a pressing window above the V-shaped slot, the pressed portion and the locking block are located in the pressing window, and the back plate covers the inner side of the pressing window and is fixedly connected to the buckle seat.

7. The quick release buckle according to claim 6, characterized in that: The matching groove is provided with a back limit block on one side close to the back plate, and the back limit block is adjacent to the back side of the elastic arm.

8. The quick release buckle according to claim 2, characterized in that: The bottom wall is penetrated by a through hole, and the locking tongue portion passes through the through hole from the back side and extends into the V-shaped slot.

9. The quick release buckle according to claim 8, characterized in that: The buckle is provided with a slot on the inner side, and the locking tongue portion is detachably engaged with the slot.

10. The quick release buckle according to any one of claims 1 to 9, characterized in that: The V-shaped slot is provided with locking grooves on two opposite sides, the locking grooves on both sides are arranged in a V shape, and the matching side walls on each side are provided with locking blocks, the locking blocks on both sides are arranged in a V shape, and the locking blocks are detachably engaged with the locking grooves.

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