Cleaning mop head

Abstract

The utility model provides a cleaning mop head which comprises a shell for installing and containing clamping pieces and a driving piece, the two clamping pieces are arranged on the two sides of the shell respectively and are in horizontal sliding fit with the shell, the driving piece is in sliding fit with the shell in the vertical direction, and the bottom end of the driving piece and the clamping pieces are guided through an inclined plane and used for driving the clamping pieces to be changed into a clamping closing state from a clamping opening state. An elastic piece is arranged in the shell and used for applying elastic force to the clamping piece, so that the clamping piece has the tendency of changing from the clamping closing state to the clamping opening state to recover, and a locking piece is arranged in the shell and used for locking the driving piece in the clamping closing state; in the initial state, the elastic piece enables the clamping pieces to keep the open state, when the driving piece moves downwards, the two clamping pieces move oppositely to close the clamping, compared with a traditional connecting switch clamp structure or a rotating switch clamp structure, the whole structure is simpler and more compact, clamp opening and clamp closing are independently driven by the driving clamp and the elastic piece respectively, the driving clamp and the elastic piece do not interfere with each other, and therefore the clamping effect is good. The whole clamp opening and closing operation is more stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of cleaning tool technology, and in particular to a cleaning mop head. Background Technology

[0002] Mops are a common cleaning tool used in daily life. Most mops on the market use Velcro or snap-fit ​​to attach the cleaning material, which is cumbersome to disassemble and replace. When replacing the cleaning material, you need to touch it directly with your hands, which can easily contaminate your hands with dirt and germs.

[0003] To overcome the above problems, cloth-clamping mops with clamping mechanisms have appeared on the market. Most existing cloth-clamping mops use linkage or rotating structures for clamping and driving. Such driving structures are relatively complex, occupy a large space, and have poor stability. Utility Model Content

[0004] To overcome the problems existing in related technologies, this utility model provides a cleaning mop head that simplifies the clamping structure, reduces the structural volume, and improves structural stability.

[0005] The purpose of this utility model is to provide a cleaning mop head, comprising:

[0006] Housing, used to mount and accommodate clamping components and drive components;

[0007] The clamping component slides horizontally with the housing. Two clamping components are provided, with the two clamping components located on both sides of the housing.

[0008] The driving component slides vertically with the housing, and the bottom end of the driving component is guided by an inclined surface to drive the clamping component from the open clamping state to the closed clamping state.

[0009] An elastic element, disposed within the housing, is used to apply an elastic force to the clamping element, causing the clamping element to tend to recover from a closed state to an open state.

[0010] A locking element, located inside the housing, is used to lock the drive component in the closed state;

[0011] In the initial state, the clamping members remain open. When the driving member moves down, the two clamping members move towards each other to clamp the wiping material attached to the bottom of the panel.

[0012] In a preferred embodiment of this invention, the driving component is disposed within the housing, and the locking component includes an elastic positioning element and a positioning hole. One of the elastic positioning element and the positioning hole is disposed on the housing, and the other is disposed on the driving component. When the driving component moves downward to its lower limit position, the elastic positioning element engages with the positioning hole to restrict the vertical movement of the driving component. Preferably, the elastic positioning element is a ball-head plunger.

[0013] In a preferred embodiment of this utility model, the clamping member is provided with a guide groove, the lower end of the driving member extends into the guide groove, and the lower end of the driving member has a first inclined surface and a second inclined surface that are staggered and arranged opposite to each other. The first inclined surface and the second inclined surface are respectively in contact with the inner groove arm of the guide groove on the two clamping members.

[0014] In a preferred embodiment of this invention, a rod connector is rotatably mounted on the top of the driving component, and the rod connector can be hinged to the mop handle.

[0015] The rod joint and the drive component rotate around the first rotation axis, and the rod joint and the mop handle rotate around the second rotation axis;

[0016] The first rotation axis is perpendicular to the second rotation axis.

[0017] In a preferred embodiment of this invention, the clamping member has a laterally extending guide portion, which slides in conjunction with the housing.

[0018] The housing includes a base plate and a cover, the cover being detachably connected to the base plate, and notches on both sides of the cover to allow space for the clamping parts, the guide extending into the housing through the notches;

[0019] A protrusion is provided at the center of the top of the cover, and the driving component is disposed inside the protrusion, and the driving component slides in cooperation with the inner wall of the protrusion.

[0020] The top of the protrusion has an opening in the middle, the bottom of the rod joint extends into the opening in the middle, and the two sides of the bottom of the rod joint are rotatably connected to the drive component via the shaft.

[0021] In a preferred embodiment of this utility model, the cover and the base plate are connected by a snap-fit ​​structure, which includes a snap-fit ​​arm and a guide support arm. One of the snap-fit ​​arm and the guide support arm is disposed on the top surface of the base plate, and the other is disposed on the bottom surface of the cover.

[0022] The guide support arm has a horizontal support guide groove, and the guide part passes through the horizontal support guide groove. Specifically, the guide part has an overlapping protrusion on its side, which slides in conjunction with the horizontal support guide groove. The guide support arm has a snap-fit ​​hole, and the snap-fit ​​arm has a snap-fit ​​protrusion that can snap into the snap-fit ​​hole.

[0023] The guide support arm is located between the guide section and the buckle arm.

[0024] In a preferred embodiment of this utility model, a clamping block is detachably connected to the bottom surface of the clamping member, and the clamping block is located outside the notch;

[0025] The clamping block has a first protruding tooth on its side facing the housing, and the bottom plate has a second protruding tooth corresponding to the first protruding tooth on its side facing the clamping block. The corresponding first protruding tooth and second protruding tooth form an area for clamping and holding the wiping object.

[0026] In a preferred embodiment of this invention, both the bottom surface of the base plate and the bottom surface of the clamping block are provided with anti-slip textures, which are used to increase the friction between the base plate and the surface of the object being wiped.

[0027] In a preferred embodiment of this utility model, the guide portion includes a central guide portion and end guide portions symmetrically arranged on both sides of the central guide portion;

[0028] A horizontal groove is provided on the end guide portion, the elastic element is disposed in the horizontal groove, a stop block is disposed in the horizontal groove, the stop block is disposed on the cover or the base plate, the inner end of the elastic element abuts against the stop block, and the outer end abuts against the inner wall of the horizontal groove facing away from the stop block.

[0029] In a preferred embodiment of this utility model, the clamping member includes a first clamping member and a second clamping member, which are respectively disposed on both sides of the housing;

[0030] The end of the central guide portion of the first clamping member is provided with a horizontally open guide groove, and the end of the central guide portion of the second clamping member extends into the horizontally open guide groove.

[0031] The beneficial effects of this utility model are as follows:

[0032] The cleaning mop head includes a housing that houses the clamping components and the driving component. Two clamping components are located on either side of the housing and slide horizontally with it. The driving component slides vertically with the housing. The bottom end of the driving component is guided by an inclined surface to drive the clamping components from an open to a closed state. An elastic element is installed inside the housing to apply elastic force to the clamping components, causing them to tend to return from a closed to an open state. A locking element is also installed inside the housing to lock the driving component in the closed state. Initially, the elastic element keeps the clamping components in an open state. When the driving component moves downward, the two clamping components move towards each other to close the clamp. Compared to traditional connecting switch clamp structures or rotary switch clamp structures, this design is simpler and more compact. Opening and closing are independently driven by the driving clamp and the elastic element, respectively, without interference between them, resulting in more stable and reliable opening and closing operations. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a cleaning mop head.

[0034] Figure 2 This is a schematic diagram of the anti-slip texture.

[0035] Figure 3 This is a schematic diagram of the mating structure of the driving component and the clamping component.

[0036] Figure 4 This is a schematic diagram of the mating structure between the elastic element and the clamping element.

[0037] Figure 5 This is a schematic diagram of the positioning hole.

[0038] Figure 6 This is a schematic diagram of the snap-fit ​​structure between the cover and the base plate.

[0039] Figure label:

[0040] 110. Shell; 110. Cover; 111. Protrusion; 112. Notch; 113. Guide support arm; 114. Insertion post; 115. Stop block; 116. Positioning hole; 117. Horizontal support guide groove; 120. Base plate; 121. Second convex tooth; 122. Buckle arm; 123. Insertion hole; 124. Snap protrusion; 130. Anti-slip texture; 200. Clamping component; 210. Clamping block; 211. First convex tooth; 220. Guide groove; 230. Center guide; 231. Horizontal open guide groove; 240. End guide; 241. Horizontal groove; 250. Overlapping protrusion; 300. Rod joint; 400. Driving component; 410. First inclined surface; 420. Second inclined surface; 500. Elastic positioning component; 600. Elastic component. Detailed Implementation

[0041] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0042] To address the issues of complex drive structures, large overall space occupation, and poor stability in commercially available mop heads with clamping mechanisms, this embodiment provides a cleaning mop head that simplifies the clamping structure, reduces structural volume, and improves structural stability.

[0043] like Figure 1-4 As shown, a cleaning mop head includes;

[0044] The housing 100 is used to mount and accommodate the clamping member 200 and the driving member 400;

[0045] The clamping member 200 is horizontally slidably engaged with the housing 100. Two clamping members 200 are provided, and the two clamping members 200 are respectively located on both sides of the housing 100.

[0046] The driving component 400 slides vertically with the housing 100. The bottom end of the driving component 400 is guided by an inclined surface to the clamping component 200, so as to drive the clamping component 200 from the open clamping state to the closed clamping state.

[0047] An elastic element 600 is disposed within the housing 100 to apply an elastic force to the clamping member 200, causing the clamping member 200 to tend to return from a closed state to an open state; preferably, the elastic element 600 is a spring.

[0048] A locking element is provided inside the housing 100 to lock the drive element 400 in the closed state;

[0049] In the initial state, the clamping member 200 remains in the open state. When the driving member 400 moves down, the two clamping members 200 move towards each other to clamp the wiping material attached to the bottom of the panel.

[0050] When it is necessary to hold the wiping object, first, place the wiping object on the bottom or countertop, then place the cleaning mop head on the wiping object, and then press down the drive member 400 until the locking member locks the drive member 400. During this process, the drive member 400 moves down and drives the two clamping members 200 to move towards each other through the inclined guide to clamp the wiping object attached to the bottom of the panel. The clamping member 200 changes from an open clamping state to a closed clamping state, and the elastic member 600 is compressed.

[0051] When it is necessary to disassemble the wiping object, one hand applies a restriction to the housing 100, and the other hand pulls the drive member 400 so that the drive member 400 is in the locked state and moves upward. During this process, the elastic member 600 releases its elastic force, driving the two clamping members 200 to move back to their original positions in opposite directions. The clamping members 200 change from the closed clamping state to the open clamping state, and the wiping and cleaning mop head are separated.

[0052] Compared to traditional connecting switch clip structures or rotary switch clip structures, the overall structure of this cleaning mop head is simpler and more compact. The opening and closing of the clips are independently driven by the drive clip and the elastic element 600, respectively, without interference between them, making the overall operation of opening and closing the clips more stable and reliable.

[0053] In practical applications, wiping materials include, but are not limited to, rags, cotton wipes, disposable towels, and face towels.

[0054] In this embodiment, as Figure 3As shown, in order to make the structure more compact, the clamping member 200 is provided with a guide groove 220. The lower end of the driving member 400 extends into the guide groove 220. The lower end of the driving member 400 has a first inclined surface 410 and a second inclined surface 420 arranged alternately. At the same time, the first inclined surface 410 and the second inclined surface 420 are arranged facing each other. The first inclined surface 410 and the second inclined surface 420 respectively fit with the inner groove arm of the guide groove 220 on the two clamping members 200. It should be noted that the inner end of the clamping member 200 extends into the housing 100. Here, the inner side specifically refers to the end side of the guide groove 220 facing away from the outer end of the clamping member 200. The surfaces of the guide groove 220 that fit with the first inclined surface 410 and the second inclined surface 420 are both inclined surfaces. Preferably, the inclined surface of the inner wall of the guide groove 220 on one clamping member 200 has the same slope as the first inclined surface 410, and the inclined surface of the inner wall of the guide groove 220 on the other clamping member 200 has the same slope as the second inclined surface 420. In practical use, to ensure the smooth sliding of the clamping member 200, two guide grooves 220 are symmetrically provided on each clamping member 200, and two first inclined surfaces 410 and two second inclined surfaces 420 are symmetrically provided.

[0055] In this embodiment, as Figure 3 , 5 As shown, the driving member 400 is disposed within the housing 100. The locking member includes an elastic positioning member 500 and a positioning hole 116. One of the elastic positioning member 500 and the positioning hole 116 is disposed on the housing 100, and the other is disposed on the driving member 400. When the driving member 400 moves down to its lower limit position, the elastic positioning member 500 engages with the positioning hole 116 to restrict the vertical movement of the driving member 400. Preferably, the elastic positioning member 500 is a ball-head plunger, and the elastic positioning member 500 is mounted on the driving member 400.

[0056] In this embodiment, as Figure 1-3 As shown, a rod connector 300 is rotatably mounted on the top of the drive component 400, and the rod connector 300 can be hinged to the mop handle;

[0057] The rod joint 300 and the drive component 400 rotate around the first rotation axis, and the rod joint 300 and the mop handle rotate around the second rotation axis;

[0058] The first rotating axis is perpendicular to the second rotating axis, thus forming a universal hinge structure, which allows the cleaning mop head to be flexibly adjusted in angle when used with the mop handle.

[0059] In this embodiment, as Figure 4 As shown, the clamping member 200 has a laterally extending guide portion, which is slidably engaged with the housing 100;

[0060] like Figure 1-2As shown, the housing 100 includes a base plate 120 and a cover 110. The cover 110 is detachably connected to the base plate 120. The cover 110 has notches 112 on both sides to allow space for the clamping member 200. The guide portion extends into the housing 100 through the notches 112. The cover 110 has a protrusion 111 at the center of its top end. The driving member 400 is disposed in the protrusion 111 and slides with the inner wall of the protrusion 111. The positioning hole 116 is disposed at the bottom end of the inner wall of the protrusion 111. The protrusion 111 has an opening at the center of its top end. The rod connector 300 extends into the opening at the center of its bottom end. The two sides of the bottom end of the rod connector 300 are rotatably connected to the driving member 400 via shaft portions.

[0061] In this embodiment, as Figure 4 , 6 As shown, the cover 110 is connected to the base plate 120 by a snap-fit ​​structure. The snap-fit ​​structure includes a snap-fit ​​arm 122 and a guide support arm 113. One of the snap-fit ​​arm 122 and the guide support arm 113 is disposed on the top surface of the base plate 120, and the other is disposed on the bottom surface of the cover 110.

[0062] The guide support arm 113 has a horizontal support guide groove 117, and the guide part passes through the horizontal support guide groove 117. Specifically, the guide part has an overlapping protrusion 250 on its side, which slides with the horizontal support guide groove 117. The guide support arm 113 has a snap-fit ​​hole, and the snap-fit ​​arm 122 has a snap-fit ​​protrusion 123 that can snap with the snap-fit ​​hole. Preferably, the snap-fit ​​protrusion 123 is a hook at the end of the snap-fit ​​arm 122.

[0063] To avoid interference, the guide support arm 113 is located between the guide portion and the latching arm 122.

[0064] In practical applications, such as Figure 3-4 As shown, in order to provide connection stability, in addition to the connection through the snap-fit ​​structure, the cover 110 and the base plate 120 are also connected by the structure of the plug-in post 114 and the plug-in hole 123. One of the plug-in post 114 and the plug-in hole 123 is located on the top surface of the base plate 120, and the other is located on the bottom surface of the cover 110.

[0065] In this embodiment, as Figure 2 As shown, the bottom surface of the clamping member 200 is detachably connected to a clamping block 210, which is located outside the notch 112; preferably, in order to ensure stable connection and convenient assembly and disassembly, the clamping block 210 is inserted into and snapped into the clamping member 200.

[0066] The clamping block 210 has a first protruding tooth 211 on the side facing the housing 100, and the bottom plate 120 has a second protruding tooth 121 corresponding to the first protruding tooth 211 on the side facing the clamping block 210. The corresponding first protruding tooth 211 and second protruding tooth 121 form an area for clamping and holding the wiping object.

[0067] In this embodiment, as Figure 2 As shown, both the bottom surface of the base plate 120 and the clamping block 210 are provided with anti-slip textures 130, which are used to increase the friction between the base plate 120 and the surface of the object being wiped.

[0068] In this embodiment, as Figure 4 As shown, the guide portion includes a central guide portion 230 and end guide portions 240 symmetrically arranged on both sides of the central guide portion 230;

[0069] The central guide portion 230 has symmetrical guide grooves 220 on both sides;

[0070] A horizontal groove 241 is provided on the end guide portion 240. The horizontal groove 241 is parallel to the moving direction of the clamping member 200. The elastic member 600 is disposed in the horizontal groove 241. A stop block 115 is disposed in the horizontal groove 241. The stop block 115 is mounted on the cover 110 or the base plate 120. The inner end of the elastic member 600 abuts against the stop block 115, and the outer end abuts against the inner wall of the horizontal groove 241 facing away from the stop block 115.

[0071] In this embodiment, as Figure 3 As shown, the clamping member 200 includes a first clamping member and a second clamping member, which are respectively disposed on both sides of the housing 100;

[0072] To make the structure more compact and reduce the size of the housing 100, the end of the central guide portion 230 of the first clamping member is provided with a horizontal open guide groove 231, and the end of the central guide portion 230 of the second clamping member extends into the horizontal open guide groove 231.

[0073] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application. Any specific values ​​in all examples shown and discussed herein should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0074] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0075] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0076] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0077] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cleaning mop head, characterized in that, include; A housing (100) for mounting and accommodating the clamping member (200) and the drive member (400); The clamping member (200) is horizontally slidably engaged with the housing (100). Two clamping members (200) are provided, and the two clamping members (200) are respectively located on both sides of the housing (100). The driving component (400) slides vertically with the housing (100), and the bottom end of the driving component (400) is guided by an inclined surface to drive the clamping component (200) from the open clamping state to the closed clamping state. An elastic element (600) is disposed inside the housing (100) to apply an elastic force to the clamping element (200), so that the clamping element (200) tends to recover from the closed state to the open state; A locking element is disposed within the housing (100) for locking the drive element (400) in the closed state; In the initial state, the clamping member (200) remains in the open state. When the driving member (400) moves down, the two clamping members (200) move towards each other to clamp the wiping material attached to the bottom of the panel.

2. The cleaning mop head according to claim 1, characterized in that: The driving member (400) is disposed inside the housing (100). The locking member includes an elastic positioning member (500) and a positioning hole (116). One of the elastic positioning member (500) and the positioning hole (116) is disposed on the housing (100), and the other is disposed on the driving member (400). When the driving member (400) moves down to the lower limit position, the elastic positioning member (500) engages with the positioning hole (116) to restrict the vertical movement of the driving member (400).

3. The cleaning mop head according to claim 1, characterized in that: The clamping member (200) has a guide groove (220) and the lower end of the driving member (400) extends into the guide groove (220). The lower end of the driving member (400) has a first inclined surface (410) and a second inclined surface (420) arranged alternately. The first inclined surface (410) and the second inclined surface (420) are arranged facing each other. The first inclined surface (410) and the second inclined surface (420) respectively fit against the inner groove arm of the guide groove (220) on the two clamping members (200).

4. The cleaning mop head according to claim 1, characterized in that: The top of the drive member (400) is rotatably mounted with a rod connector (300), which can be hinged to the mop handle; The rod joint (300) and the drive member (400) rotate about a first rotation axis, and the rod joint (300) and the mop handle rotate about a second rotation axis; The first rotation axis is perpendicular to the second rotation axis.

5. The cleaning mop head according to claim 4, characterized in that: The clamping member (200) has a laterally extending guide portion that slides in conjunction with the housing (100); The housing (100) includes a base plate (120) and a cover (110). The cover (110) is detachably connected to the base plate (120). The cover (110) has notches (112) on both sides to allow space for the clamping member (200). The guide extends into the housing (100) through the notches (112). The top center of the cover (110) is provided with a protrusion (111), and the driving member (400) is disposed inside the protrusion (111). The driving member (400) slides in cooperation with the inner wall of the protrusion (111). The top center of the protrusion (111) is open, the bottom center of the rod connector (300) extends into the opening, and the two sides of the bottom of the rod connector (300) are rotatably connected to the drive member (400) via the shaft.

6. The cleaning mop head according to claim 5, characterized in that: The cover (110) and the base plate (120) are connected by a snap-fit ​​structure. The snap-fit ​​structure includes a snap-fit ​​arm (122) and a guide support arm (113). One of the snap-fit ​​arm (122) and the guide support arm (113) is disposed on the top surface of the base plate (120), and the other is disposed on the bottom surface of the cover (110). The guide support arm (113) has a horizontal support guide groove (117), the guide part passes through the horizontal support guide groove (117), the guide support arm (113) is provided with a buckle hole, and the buckle arm (122) has a buckle protrusion (123) that can be buckled with the buckle hole. The guide support arm (113) is located between the guide portion and the snap-on arm (122).

7. The cleaning mop head according to claim 5, characterized in that: The bottom surface of the clamping member (200) is detachably connected to a clamping block (210), which is located outside the notch (112); The clamping block (210) has a first protruding tooth (211) on the side facing the housing (100), and the bottom plate (120) has a second protruding tooth (121) corresponding to the first protruding tooth (211) on the side facing the clamping block (210). The corresponding first protruding tooth (211) and second protruding tooth (121) form an area for clamping and holding the wiping object.

8. The cleaning mop head according to claim 5, characterized in that: The bottom surfaces of the base plate (120) and the clamping block (210) are both provided with anti-slip textures (130).

9. The cleaning mop head according to claim 5, characterized in that: The guide portion includes a central guide portion (230) and end guide portions (240) symmetrically arranged on both sides of the central guide portion (230); A horizontal groove (241) is provided on the end guide (240), and the elastic element (600) is provided in the horizontal groove (241). A stop block (115) is provided in the horizontal groove (241), and the stop block (115) is provided on the cover (110) or the base plate (120). The inner end of the elastic element (600) abuts against the stop block (115), and the outer end abuts against the horizontal groove (241) facing away from the inner wall of the stop block (115).

10. The cleaning mop head according to claim 9, characterized in that: The clamping member (200) includes a first clamping member and a second clamping member, which are respectively disposed on both sides of the housing (100); The end of the central guide portion (230) of the first clamping member is provided with a horizontal open guide groove (231), and the end of the central guide portion (230) of the second clamping member extends into the horizontal open guide groove (231).

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