Flat wire clamping tool

Abstract

The invention discloses a flat wire clamping tool, and belongs to the technical field of flat wire motor production equipment. When the ends of the flat wires are clamped through the flat wire clamping tool, the ends of every two flat wires are inserted into the clamping hollowed-out area from the bottom of the tool through the cavity of the supporting base, and the first clamping piece and the second clamping piece move in the radial direction of the rotating disc when the rotating disc is driven to rotate through the rotating disc and the multiple clamping pieces which are matched with each other. In this way, the first hollowed-out area and the second hollowed-out hole area move in a staggered mode to abut against the ends of the two flat wires to move and then make contact with the flat wires in an attached mode. Besides, the part, between the two opposite first hollow-out areas distributed on the two side faces, in the first clamping piece is elastic, so that clamping differences caused by appearance, size and position deviations of the copper wire are compensated in a self-adaptive mode due to the elastic interaction force when the end of the flat wire is clamped under the action of the same driving force; and all the end copper wires are tightly attached in pairs, so that the quality of cutting and hot melting welding is ensured.

Description

Technical Field

[0001] This application relates to the technical field of flat wire motor production equipment, and particularly relates to a flat wire clamping tooling. Background Art

[0002] Flat wire motors have a high power density and are mainly used in new energy vehicles. Flat wire motors have the characteristics of small volume and high slot fill factor, and have good thermal conductivity. After the flat wires are inserted into the stator of the flat wire motor, the ends of the flat wires need to be welded to complete the electrical connection through welding. A relatively large number of flat wires are inserted into the stator, and the flat wires are usually four-layer, six-layer, eight-layer or more than eight-layer. During production, the flat wires enter the slots of the stator and then are twisted as required to make the ends of the flat wires in different slots approach each other, and then the adjacent two ends are welded.

[0003] When the flat wires are twisted, due to the relatively high hardness of the material of the flat wires and insufficient twisting accuracy, the ends of the two flat wires cannot just fit together, resulting in the ends of the flat wires being misaligned with each other or having a gap between the ends of the two flat wires. Therefore, before welding the ends of the flat wires, the ends of the two flat wires need to be clamped to align the ends of the two flat wires. Summary of the Invention

[0004] The embodiments of this application provide a flat wire clamping tooling. It can solve the problem in the prior art that there is an urgent need for a tooling that can effectively clamp the ends of flat wires before welding. The technical solution is as follows: On the one hand, a flat wire clamping tooling is provided. The flat wire clamping tooling includes: A support seat, a ring-shaped turntable and a plurality of clamping members; The support seat has a cavity; The turntable is installed in the cavity and is rotatably connected to the support seat; The plurality of clamping members are circumferentially distributed on the top of the turntable and are in transmission connection with the turntable. The extending direction of each clamping member is parallel to the radial direction of the turntable; the plurality of clamping members include: a plurality of first clamping members and a plurality of second clamping members arranged at intervals. Each of the two opposite side surfaces of each clamping member has a plurality of clamping convex portions arranged along the extending direction of the clamping member; the adjacent two clamping convex portions on one side surface of the first clamping member enclose a first hollow area, and the part of the first clamping member between the two opposite first hollow areas distributed on the two side surfaces has elasticity; the adjacent two clamping convex portions on one side surface of the second clamping member enclose a second hollow area; the first hollow area and the second hollow area in the adjacent first clamping member and second clamping member correspond one by one, and a clamping hollow area for clamping the end of the flat wire is formed between each group of corresponding first hollow area and second hollow area, and the clamping hollow area communicates with the cavity; Wherein, the turntable is configured to: when rotating, drive both the first clamping member and the second clamping member to move along the radial direction of the turntable and the moving directions of the two are opposite, so that the first hollow area and the second hollow area move in a staggered manner.

[0005] Optionally, the second clamping member is a rigid member.

[0006] Optionally, the part of the first clamping member between the two relatively first hollow areas distributed on the two sides has a hollow groove.

[0007] Optionally, the first clamping member includes: a rigid member part and an elastic transition part connected to each other, the rigid member part has the clamping convex part, and the transition part is distributed between the two relatively first hollow areas on the two sides of the first clamping member.

[0008] Optionally, the transition part is a structure made of rubber.

[0009] Optionally, the edge part of the turntable has a first guiding inclined chute corresponding to the first clamping member, one end of the first clamping member has a first connecting pin located in the first guiding inclined chute, and the first connecting pin is slidably connected to the first guiding inclined chute; the edge part of the turntable also has a second guiding inclined chute corresponding to the second clamping member, one end of the second clamping member has a second connecting pin located in the second guiding inclined chute, and the second connecting pin is slidably connected to the second guiding inclined chute; Wherein, a group of two adjacent first guiding inclined chutes and second guiding inclined chutes are symmetrically distributed.

[0010] Optionally, the support base includes: a positioning disk and a top cover that are fixedly connected and arranged oppositely, and the turntable and the plurality of clamping members are all located between the positioning disk and the top cover.

[0011] Optionally, the side of the top cover facing the turntable has a plurality of chutes corresponding to the plurality of clamping members one by one, and the extending direction of the chutes is parallel to the radial direction of the turntable; at least part of each clamping member is located in the corresponding chute and is slidably connected to the chute.

[0012] Optionally, the positioning disk has a positioning cavity that matches the shape of the turntable and a notch communicated with the positioning cavity, the turntable is located in the positioning cavity and is rotatably connected to the positioning disk, and a part of the turntable is exposed from the notch.

[0013] Optionally, the top cover has a plurality of strip-shaped through holes, and each strip-shaped through hole covers the clamping hollow area surrounded by a group of two adjacent first clamping members and second clamping members.

[0014] The beneficial effects brought by the technical solutions provided by the embodiments of the present application at least include: When clamping the end of the flat wire by the flat wire clamping tooling, the ends of every two flat wires are inserted from the bottom of the tooling into the cavity of the support base and then into the clamping hollow area. By means of the mutually cooperating turntable and multiple clamping members, when the turntable is driven to rotate, the first clamping member and the second clamping member move along the radial direction of the turntable. In this way, through the misaligned movement of the first hollow area and the second hollow hole area, the ends of the two flat wires are made to contact and fit after moving. Additionally, by making the part between the two relatively arranged first hollow areas distributed on the two sides of the first clamping member elastic, under the action of the same driving force, when the ends of the flat wires are clamped, due to the elastic interaction force, self-adaptive compensation for the clamping differences caused by the shape, size, and position deviations of the copper wires is achieved, ensuring that all the end copper wires are closely attached to each other in pairs, thereby ensuring the quality of cutting and hot melt welding. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is a schematic structural diagram of a flat wire clamping tooling provided by an embodiment of the present application; Figure 2 is Figure 1 an exploded schematic diagram of the flat wire clamping tooling shown; Figure 3 is a schematic layout diagram of a clamping member provided by an embodiment of the present application; Figure 4 is a schematic diagram of the effect of the tooling clamping the end of the flat wire; Figure 5 is a schematic structural diagram of a first clamping member provided by an embodiment of the present application; Figure 6 is a schematic structural diagram of another first clamping member provided by an embodiment of the present application; Figure 7 is a front view of a partial structure of a flat wire clamping tooling provided by an embodiment of the present application; Figure 8 is an exploded schematic diagram of a partial structure of a flat wire clamping tooling provided by an embodiment of the present application; Figure 9 is an exploded schematic diagram of a partial structure of a flat wire clamping tooling from another perspective provided by an embodiment of the present application.

[0017] Among them, the support base 100, the turntable 200, the clamping member 300, the cavity 101, the first clamping member A1, the second clamping member A2, the first hollow area K1, the second hollow area K2, the clamping hollow area K, the first guiding inclined chute 201, the first connecting pin X1, the second clamping member A2, the second connecting pin X2, the positioning disk 102, the top cover 103, the chute 103a, the positioning cavity 102a, the notch 102b, the handle member 203, the strip-shaped through hole 103b.

[0018] Through the above-mentioned drawings, the specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0019] To make the objectives, technical solutions, and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the drawings.

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics can be combined in one or more embodiments in any suitable manner.

[0022] Please refer to Figure 1 and Figure 2 , Figure 1 which are the structural schematic diagrams of a flat wire clamping tooling provided by the embodiments of the present application, Figure 2 and Figure 1 which is the exploded schematic diagram of the flat wire clamping tooling shown. The flat wire clamping tooling may include: a support base 100, a ring-shaped turntable 200, and a plurality of clamping members 300.

[0023] The support base 100 in the flat wire clamping tooling may have a cavity 101.

[0024] The turntable 200 in the flat wire clamping tooling may be installed in the cavity 101 of the support base 100 and rotatably connected to the support base 100.

[0025] A plurality of clamping members 300 in the flat wire clamping tooling can be circumferentially distributed on the top of the turntable 200 and can be drivingly connected to the turntable 200, and the extending direction of each clamping member 300 can be parallel to the radial direction of the turntable 200. The plurality of clamping members 300 can include: a plurality of first clamping members A1 and a plurality of second clamping members A2 that are spaced apart.

[0026] Please refer to Figure 3 , Figure 3 which is a schematic diagram of the arrangement of a clamping member provided in an embodiment of the present application. Each of the two opposite side surfaces of each clamping member 300 can have a plurality of clamping protrusions 301 arranged along the extending direction of the clamping member 300. Between two adjacent clamping protrusions 301 on one side surface of the first clamping member A1, a first hollow area K1 can be formed, and the portion of the first clamping member A1 between two relatively arranged first hollow areas K1 distributed on the two side surfaces has elasticity. Between two adjacent clamping protrusions 301 on one side surface of the second clamping member A2, a second hollow area K2 can be formed. Among them, the first hollow area K1 and the second hollow area K2 in the adjacent first clamping member A1 and second clamping member A2 correspond one by one, and a clamping hollow area K for clamping the end of the flat wire can be formed between each group of corresponding first hollow area K1 and second hollow area K2, and the clamping hollow area K can communicate with the cavity 101 of the support seat 100. Here, the two opposite side surfaces of each clamping member 300 can be two side surfaces circumferentially distributed along the turntable 200, and the width of each clamping hollow area K can be slightly larger than the width of the ends of two flat wires.

[0027] Among them, the turntable 200 can be configured to: when rotating, drive both the first clamping member A1 and the second clamping member A2 to move along the radial direction of the turntable 200 and the moving directions of the two are opposite, so that the first hollow area K1 and the second hollow area K2 move in a staggered manner. Here, when the turntable 200 rotates, it can drive the first clamping member A1 and the second clamping member A2 to move synchronously along the radial direction of the turntable 200, and the moving direction of the first clamping member A1 is opposite to the moving direction of the second clamping member A2.

[0028] In the embodiment of the present application, please refer to Figure 3 and Figure 4 , Figure 4It is a schematic diagram of the effect of clamping the end of the flat wire by the tooling. When clamping the ends of two flat wires by the flat wire clamping tooling, the ends of every two flat wires are inserted into the clamping hollow area K from the bottom of the tooling through the cavity 101 of the support base 100. By means of the mutually cooperating turntable 200 and multiple clamping members 300, when the turntable 200 is driven to rotate, the first clamping member A1 and the second clamping member A2 move along the radial direction of the turntable 200. In this way, through the misaligned movement of the first hollow area K1 and the second hollow hole area K2 to abut against the ends of the two flat wires after movement to achieve contact and fit, the limitation of the ends of the two flat wires in two degrees of freedom directions can be realized. In addition, by making the part between the two relatively first hollow areas K1 distributed on the two sides of the first clamping member A1 elastic, when the ends of the flat wires are clamped under the action of the same driving force, the elastic interaction force realizes the adaptive compensation for the clamping differences caused by the shape, size and position deviations of the copper wires, ensuring that all the end copper wires are closely attached to each other in pairs, thereby ensuring the quality of cutting and hot melt welding.

[0029] In summary, the embodiment of the present application provides a flat wire clamping tooling, which may include: a support base, an annular turntable and multiple clamping members. When clamping the end of the flat wire by the flat wire clamping tooling, the ends of every two flat wires are inserted into the clamping hollow area from the bottom of the tooling through the cavity of the support base. By means of the mutually cooperating turntable and multiple clamping members, when the turntable is driven to rotate, the first clamping member and the second clamping member move along the radial direction of the turntable. In this way, through the misaligned movement of the first hollow area and the second hollow hole area to abut against the ends of the two flat wires after movement to achieve contact and fit, the limitation of the ends of the two flat wires in two degrees of freedom directions can be realized. In addition, by making the part between the two relatively first hollow areas distributed on the two sides of the first clamping member elastic, when the ends of the flat wires are clamped under the action of the same driving force, the elastic interaction force realizes the adaptive compensation for the clamping differences caused by the shape, size and position deviations of the copper wires, ensuring that all the end copper wires are closely attached to each other in pairs, thereby ensuring the quality of cutting and hot melt welding.

[0030] Optionally, the second clamping member A2 may be a rigid member. Exemplarily, the second clamping member A2 may be a structure made of ordinary steel.

[0031] Regarding that the part between the two relatively first hollow areas K1 distributed on the two sides of the first clamping member A1 has elasticity, the embodiment of the present application has multiple implementation manners, and the present application takes the following two optional implementation manners as examples for schematic illustration: The first optional implementation manner, please refer to Figure 5 , Figure 5It is a schematic structural diagram of a first clamping member provided by an embodiment of the present application. In the first clamping member A1, the portion between two relatively arranged first hollow areas K1 distributed on two sides has a hollow groove C. In this case, by providing the hollow groove C on the portion between two relatively arranged first hollow areas K1 on two sides of the first clamping member A1, the rigidity of the first clamping member A1 is reduced so that the first clamping member A1 has a certain elasticity. Here, the first clamping member A1 can be a structure made of ordinary steel.

[0032] For the second optional implementation manner, please refer to Figure 6 , Figure 6 It is a schematic structural diagram of another first clamping member provided by an embodiment of the present application. The first clamping member A1 can include: a rigid member portion A11 and an elastic transition portion A12 connected to each other. The rigid member portion A11 can have a clamping convex portion 301, and the transition portion A12 can be distributed between two relatively arranged first hollow areas K1 on two sides of the first clamping member A1. By way of example, the rigid member portion A11 and the transition portion A12 in the first clamping member A1 can be formed by injection molding. Here, the rigid member portion A11 can be a structure made of ordinary steel.

[0033] In the present application, the transition portion A12 in the first clamping member A1 can be a structure made of rubber. It should be noted that the transition portion A12 in the first clamping member A1 can be a structure made of other elastic materials.

[0034] Optionally, please refer to Figure 7 , Figure 7It is a front view of a partial structure of a flat wire clamping tooling provided by an embodiment of the present application. An edge portion of the turntable 200 may have a first guiding inclined chute 201 corresponding to the first clamping member A1. One end of the first clamping member A1 may have a first connecting pin X1 located in the first guiding inclined chute 201, and the first connecting pin X1 may be slidably connected to the first guiding inclined chute 201. The edge portion of the turntable 200 may also have a second guiding inclined chute 202 corresponding to the second clamping member A2. One end of the second clamping member A2 may have a second connecting pin X2 located in the second guiding inclined chute 202, and the second connecting pin X2 may be slidably connected to the second guiding inclined chute 202. Among them, a group of two adjacent first guiding inclined chutes 201 and second guiding inclined chutes 202 are symmetrically distributed. In this case, by providing a plurality of first guiding inclined chutes 201 corresponding to the first clamping member A1 and a plurality of second guiding inclined chutes 202 corresponding to the second clamping member A2 at the edge of the turntable 200. Thus, during the process of the turntable 200 rotating in one direction, the first clamping member A1 and the second clamping member A2 respectively move in different directions along the radial direction of the turntable 200. Here, one end to the other end of the first guiding inclined chute 201 gradually approaches the center direction of the turntable 200, and one end to the other end of the second guiding inclined chute 202 gradually approaches the center direction of the turntable 200.

[0035] Exemplarily, both the first connecting pin X1 and the second connecting pin X2 may be cam followers, and the cam followers are installed at the end of the clamping member 300 through bolts and nuts.

[0036] In the embodiment of the present application, please refer to Figure 8 and Figure 9 , Figure 8 is an exploded schematic view of a partial structure of a flat wire clamping tooling provided by an embodiment of the present application, Figure 9 is an exploded schematic view of another perspective of a partial structure of a flat wire clamping tooling provided by an embodiment of the present application. The support base 100 may include: a positioning disk 102 and a top cover 103 that are fixedly connected and oppositely arranged. The turntable 200 and a plurality of clamping members 300 may be located between the positioning disk 102 and the top cover 103. In this case, the oppositely arranged positioning disk 102 and top cover 103 can limit the up-and-down movement freedom of the turntable 200 and a plurality of clamping members 300, ensuring the rotation stability of the turntable 200 and the movement stability of a plurality of clamping members 300.

[0037] Optionally, as Figure 9As shown in the figure, one side of the top cover 103 facing the turntable 200 may have a plurality of chutes 103a corresponding one-to-one to the plurality of clamping members 300. The extending direction of each chute 103a may be parallel to the radial direction of the turntable 200. At least a part of each clamping member 300 may be located in the corresponding chute 103a and may be slidably connected to the chute 103a. In this case, by providing the chute 103a on the side of the top cover 103 facing the turntable 200, the chute 103a can guide the movement of the clamping member 300, ensuring that the movement accuracy of the clamping member 300 is relatively high, and further ensuring that the clamping effect of the clamping member 300 on the end of the flat wire is better.

[0038] In the embodiment of the present application, as Figure 8 shown, the positioning disk 102 may have a positioning cavity 102a that fits the shape of the turntable 200, and a notch 102b communicating with the positioning cavity 102a. The turntable 200 may be located in the positioning cavity 102a and rotatably connected to the positioning disk 102, and a part of the turntable 200 may be exposed through the notch 102b of the positioning disk 102. In this case, by providing the positioning cavity 102a in the positioning disk 102 and the notch 102b communicating with the positioning cavity 102a, thus, the positioning cavity 102a can ensure the rotation accuracy of the turntable 200, and the notch 102b is convenient for rotating the turntable 200. For example, the side surface of the turntable 200 may have a handle member 203 extending from the notch 102b, and the turntable 200 can be conveniently driven through the handle member 203, improving the operation convenience.

[0039] Optionally, as Figure 8 shown, the top cover 103 may have a plurality of strip-shaped through holes 103b. Each strip-shaped through hole 103b may cover a clamping hollow area K surrounded by a group of adjacent two first clamping members A1 and second clamping members A2. In this way, by providing the strip-shaped through holes 103b in the top cover 103, the end of the flat wire can pass through the strip-shaped through holes 103b for subsequent trimming and welding.

[0040] In summary, the embodiment of the present application provides a flat wire clamping tooling, which may include: a support base, a ring-shaped turntable, and a plurality of clamping members. When clamping the end of the flat wire by the flat wire clamping tooling, the ends of every two flat wires are inserted into the clamping hollow area from the bottom of the tooling through the cavity of the support base. By means of the mutually cooperating turntable and the plurality of clamping members, when the turntable is driven to rotate, the first clamping member and the second clamping member move along the radial direction of the turntable. In this way, through the misaligned movement of the first hollow area and the second hollow hole area, the ends of the two flat wires are abutted and contacted and fitted after moving. In addition, by providing the portion between the two relatively first hollow areas distributed on the two sides of the first clamping member with elasticity, under the action of the same driving force, when the ends of the flat wire are clamped, due to the elastic interaction force, an adaptive compensation is realized for the clamping difference brought by the shape, size and position deviation of the copper wire, ensuring that all the end copper wires are closely attached to each other in pairs, thereby ensuring the quality of cutting and hot melt welding.

[0041] The embodiment of the flat wire clamping tooling provided by the embodiment of the present invention and the embodiment of the usage method of the flat wire clamping tooling can be referred to each other, and the embodiment of the present invention will not be elaborated herein.

[0042] In the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

[0043] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flat wire clamping tooling, characterized in that Comprising: A support base, an annular turntable, and a plurality of clamping members; The support base has a cavity; The turntable is installed in the cavity and is rotatably connected to the support base; The plurality of clamping members are circumferentially distributed on the top of the turntable and are drivingly connected to the turntable, and the extending direction of each clamping member is parallel to the radial direction of the turntable; the plurality of clamping members include: a plurality of first clamping members and a plurality of second clamping members arranged at intervals, and each of the two opposite side surfaces of each clamping member has a plurality of clamping protrusions arranged along the extending direction of the clamping member; two adjacent clamping protrusions on one side surface of the first clamping member enclose a first hollow area, and the portion of the first clamping member between the two opposite first hollow areas distributed on the two side surfaces has elasticity; two adjacent clamping protrusions on one side surface of the second clamping member enclose a second hollow area; the first hollow area and the second hollow area in the adjacent first clamping member and second clamping member correspond one by one, and a clamping hollow area for clamping the end of the flat wire is formed between each group of corresponding first hollow area and second hollow area, and the clamping hollow area communicates with the cavity; Wherein, the turntable is configured to: drive the first clamping member and the second clamping member to move along the radial direction of the turntable in opposite directions when rotating, so that the first hollow area and the second hollow area move in a staggered manner.

2. The flat wire clamping tooling according to claim 1, characterized in that, The second clamping member is a rigid member.

3. The flat wire clamping tooling according to claim 1, characterized in that, The portion of the first clamping member between the two opposite first hollow areas distributed on the two side surfaces has a hollow groove.

4. The flat wire clamping tooling according to claim 1, characterized in that, The first clamping member includes: a rigid member portion and an elastic transition portion connected to each other, the rigid member portion has the clamping protrusion, and the transition portion is distributed between the two opposite first hollow areas on the two side surfaces of the first clamping member.

5. The flat wire clamping tooling according to claim 4, characterized in that, The transition portion is a structure made of rubber.

6. The flat wire clamping tooling according to any one of claims 1-5, characterized in that, The edge portion of the turntable has a first guiding inclined chute corresponding to the first clamping member, and one end of the first clamping member has a first connecting pin located in the first guiding inclined chute, and the first connecting pin is slidably connected to the first guiding inclined chute; the edge portion of the turntable also has a second guiding inclined chute corresponding to the second clamping member, and one end of the second clamping member has a second connecting pin located in the second guiding inclined chute, and the second connecting pin is slidably connected to the second guiding inclined chute; Wherein, a group of two adjacent first guiding inclined chutes and second guiding inclined chutes are symmetrically distributed.

7. The flat wire clamping tooling according to claim 6, wherein, The support base includes: a positioning disk and a top cover that are fixedly connected and arranged oppositely, and the turntable and the plurality of clamping members are both located between the positioning disk and the top cover.

8. The flat wire clamping tooling according to claim 7, wherein, The side of the top cover facing the turntable has a plurality of chutes corresponding to the plurality of clamping members one by one, and the extending direction of the chutes is parallel to the radial direction of the turntable; at least part of each clamping member is located in the corresponding chute and is slidably connected to the chute.

9. The flat wire clamping tooling according to claim 7, characterized in that, The positioning disk has a positioning cavity that matches the shape of the turntable, and a notch communicating with the positioning cavity, the turntable is located in the positioning cavity and is rotatably connected to the positioning disk, and a part of the turntable is exposed from the notch.

10. The flat wire clamping tooling according to claim 7, characterized in that, The top cover has a plurality of strip-shaped through holes, and each strip-shaped through hole covers a clamping hollow area formed by a set of two adjacent first clamping members and second clamping members.

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