Product positioning jig
By designing a positioning unit consisting of a base plate, a cover plate, and a lever, the product can be positioned and removed using the elastic restoring force of the elastic element. The cover plate can also be disassembled independently for maintenance, which solves the problem of inconvenient disassembly and maintenance of existing positioning fixtures and improves maintenance efficiency.
Patent Information
- Application Number
- CN202520596634.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Existing positioning fixtures are troublesome and time-consuming to disassemble and maintain the pressure blocks after long-term use. There is an urgent need for a positioning fixture that is easy to maintain.
A product positioning fixture was designed, which consists of a positioning unit composed of a base plate, a cover plate, a lever, and an elastic element. The lever can be slidably connected to the base plate, and the product can be positioned and removed by the elastic restoring force of the elastic element. The cover plate can be disassembled independently for easy maintenance.
It enables simple and convenient positioning and independent maintenance of multiple products, improving maintenance efficiency and simplifying the disassembly and assembly process.
Smart Images

Figure CN223917797U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a clamp, and more particularly to a product positioning fixture. Background Technology
[0002] During the assembly of camera modules, the anisotropic conductive adhesive film requires a positioning fixture for placement and positioning. Current positioning fixtures consist of two interconnected plates, with multiple holes formed on the upper plate for placing the anisotropic conductive adhesive film. A pressure block for positioning the film is installed between the upper and lower plates. After prolonged use, if maintenance or replacement of the pressure block is required, the upper and lower plates must be separated to remove the corresponding pressure block. This process is cumbersome and time-consuming, necessitating a more convenient and maintainable positioning fixture. Utility Model Content
[0003] The purpose of this utility model is to provide a product positioning fixture to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.
[0004] The solution to the technical problem of this utility model is:
[0005] A product positioning fixture includes: a base plate; and a positioning unit including a cover plate, a lever, and an elastic element. The lever is slidably connected to the top side of the base plate, and the cover plate is connected to the top side of the base plate. A clearance space is formed between the cover plate and the base plate for the lever to move and avoid. The cover plate is provided with a positioning hole communicating with the clearance space. The elastic element abuts against the lever and the base plate and has a tendency to press the lever towards the positioning hole. There are multiple positioning units.
[0006] This technical solution has at least the following beneficial effects: Multiple positioning units can be used to position multiple products. Specifically, in each positioning unit, if product positioning is required, the lever is first moved away from the positioning hole. At this time, the elastic element is elastically compressed. Then, the product is placed into the positioning hole, and the external force on the lever is removed. The elastic restoring force of the elastic element pushes the lever towards the positioning hole, using the lever to press and position the product. When the product needs to be removed, the lever is moved away from the positioning hole. When maintenance is required on the lever, elastic element, etc., the cover plate of the corresponding positioning unit can be removed from the base plate to maintain the lever located below the cover plate. In this way, multiple positioning units are independently set on the base plate, and the internal structure of the corresponding positioning unit can be replaced as needed. The operation is simpler, more time-saving, and more convenient, effectively improving maintenance efficiency.
[0007] As a further improvement to the above technical solution, the clearance space includes a mounting groove disposed on the top side of the substrate. The bottom of the lever is located within the mounting groove, and the lever can move along the length direction of the mounting groove. The top side of the lever near the positioning hole has a pressing portion protruding upward from the mounting groove, and the pressing portion extends in the direction close to the positioning hole. A mounting groove for sliding mounting of the lever is provided on the top side of the substrate. When the bottom of the lever is inserted into the mounting groove, the lever can move along the length direction of the mounting groove, realizing the sliding connection of the lever to the substrate. A pressing portion protruding from the mounting groove is formed on the top side of the lever, and the pressing portion extends in the direction close to the positioning hole. When the lever reciprocates within the mounting groove, it can drive the pressing portion closer to or away from the mounting groove, thereby using the pressing portion to press and position or release the product.
[0008] As a further improvement to the above technical solution, the top pressing part is provided with a positioning concave angle on one side corresponding to the positioning hole. When the product is placed into the positioning hole, the top pressing part presses against the product. At this time, the positioning concave angle on the top pressing part can avoid the corners of the product, and the positioning concave angle of the top pressing part can limit the product, thereby improving the stability of pressing and positioning the product.
[0009] As a further improvement to the above technical solution, the positioning unit further includes a buffer pad located between the cover plate and the substrate, with the pressing portion positioned above the buffer pad. When the product is placed in the positioning hole, the buffer pad supports the product, thus improving the protective effect during product placement and positioning.
[0010] As a further improvement to the above technical solution, a plurality of positioning posts are connected to the top side of the substrate, and the cover plate is provided with limiting holes at the positions of the plurality of positioning posts. The plurality of positioning posts pass through the buffer pad and are inserted into the plurality of limiting holes. When assembling the positioning unit, the buffer pad is aligned with the plurality of limiting holes, the buffer pad is placed on the substrate first, and then the cover plate is placed on the substrate. At this time, the plurality of positioning posts are also aligned with the plurality of limiting holes to install and position the cover plate. This improves the convenience of installing and positioning the buffer pad and the cover plate, thereby improving the installation effect of the entire positioning unit.
[0011] As a further improvement to the above technical solution, a storage groove is provided on the bottom side of the cover plate corresponding to the position of the buffer pad. When assembling the cover plate, the buffer pad on the bottom side of the cover plate and the storage groove are directly opposite each other. When the cover plate is connected to the substrate, the buffer pad is stored in the storage groove, thereby preventing the cover plate from pressing and deforming the buffer pad, which helps to ensure that the buffer pad can provide elastic cushioning function.
[0012] As a further improvement to the above technical solution, the substrate has a first through hole corresponding to the position of the positioning hole, and the buffer pad has a second through hole corresponding to the position of the first through hole. The areas of the first through hole and the second through hole are both smaller than the area of the positioning hole. Similarly, the buffer pad has a second through hole, so when the product is placed in the positioning hole, the buffer pad supports the product around the second through hole. Furthermore, the product can be observed and inspected through the first and second through holes below, improving overall ease of use.
[0013] As a further improvement to the above technical solution, the elastic element is a spring. A first groove is provided on the lever corresponding to the position of the spring, and a second groove is provided on one side of the mounting groove corresponding to the position of the spring. Both ends of the spring are inserted into the first and second grooves respectively. The spring provides the elastic force to press and position the lever. A first groove is provided at the end of the lever for installing and positioning one end of the spring. Similarly, a second groove is provided on one side of the mounting groove for installing and positioning the other end of the spring. This allows for quick installation and positioning of the spring and prevents relative torsion of the spring during installation.
[0014] As a further improvement to the above technical solution, the substrate is provided with a lower clearance hole corresponding to the position of the lever, and the lower clearance hole extends along the moving direction of the lever. The driving component of the peripheral device can pass through the lower clearance hole on the bottom side of the substrate to connect to the lever, thereby applying external force to the lever. In this way, the levers in multiple positioning units can be driven from the bottom side of the substrate, while products can be picked up and placed from the top of the substrate, reducing interference between structural components and making the overall design more reasonable.
[0015] As a further improvement to the above technical solution, the clearance space includes a clearance groove disposed on the bottom side of the cover plate, and an upper clearance hole is provided at the bottom of the clearance groove, the upper clearance hole extending along the length direction of the lever. The upper clearance hole allows for easy observation of the lever's movement, thereby better determining the clamping and loosening state of the product and improving the user experience. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.
[0017] Figure 1 This is a top view of the entire utility model.
[0018] Figure 2This is a schematic diagram of the exploded structure of the positioning unit and the substrate of this utility model.
[0019] Figure 3 yes Figure 2 A magnified view of part A.
[0020] Figure 4 This is another view of the cover plate and the lever in the separated state of this utility model.
[0021] Figure 5 yes Figure 1 Schematic diagram of the isometric section of the BB part.
[0022] In the attached diagram: 100-substrate, 110-mounting groove, 111-second groove, 112-lower clearance hole, 120-positioning post, 130-first through hole, 200-positioning unit, 210-cover plate, 211-clearance groove, 212-positioning hole, 213-storage groove, 214-upper clearance hole, 215-limiting hole, 220-pull block, 221-top pressing part, 222-positioning concave angle, 223-first groove, 224-limiting concave angle, 230-elastic element, 240-buffer pad, 241-second through hole. Detailed Implementation
[0023] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.
[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0027] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 A product positioning fixture includes a base plate 100 and a positioning unit 200. The positioning unit 200 includes a cover plate 210, a lever 220, and an elastic member 230. The lever 220 is slidably connected to the top side of the base plate 100, and the cover plate 210 is connected to the top side of the base plate 100. A clearance space is formed between the cover plate 210 and the base plate 100 for the lever 220 to move and avoid movement. The cover plate 210 is provided with a positioning hole 212 communicating with the clearance space. The shape of the positioning hole 212 can be circular or shaped, for example, when the shape of the positioning hole 212 is rectangular, the corner of the positioning hole 212 can be provided with an inward concave angle to further avoid the corner of the product and prevent damage when the product is placed and positioned. In addition, the elastic member 230 abuts against the lever 220 and the base plate 100, and the elastic member 230 has a tendency to press the lever 220 into the positioning hole 212. There are multiple positioning units 200.
[0028] As described above, multiple positioning units 200 can be used to position multiple products. Specifically, in each positioning unit 200, if product positioning is required, the lever 220 is first moved away from the positioning hole 212. At this time, the elastic element 230 is elastically compressed. Then, the product is placed into the positioning hole 212. The external force on the lever 220 is then removed, and the elastic restoring force of the elastic element 230 pushes the lever 220 towards the positioning hole 212, using the lever 220 to press and position the product. When it is necessary to remove the product, the lever 220 is moved away from the positioning hole 212. Move the lever 220 away from the positioning hole 212. When maintenance is required on the lever 220, elastic element 230, etc., remove the cover plate 210 of the corresponding positioning unit 200 from the base plate 100 to maintain the lever 220 located below the cover plate 210. In this way, multiple positioning units 200 are independently set on the base plate 100, and the internal structure of the corresponding positioning unit 200 can be replaced as needed. The operation is simpler, more time-saving, and more convenient, effectively improving maintenance efficiency.
[0029] Naturally, the connection between the cover plate 210 and the substrate 100 is a detachable connection, so that the cover plate 210 can be removed from the substrate 100 to maintain the internal structural components. There are several ways to detachably connect the cover plate 210 to the substrate 100. For example, the cover plate 210 can be connected to the substrate 100 by a snap-fit connection, or multiple screws can be passed through the cover plate 210 and connected to the substrate 100 to press and fix the cover plate 210 to the substrate 100.
[0030] There are several ways to slide the lever 220 to the substrate 100. For example, the lever 220 and the substrate 100 can be slidably connected by a slide rail and a slide groove. Since a structure for the lever 220 to be accommodated needs to be provided between the cover plate 210 and the substrate 100 after the cover plate 210 is connected to the substrate 100, a groove structure for the lever 220 to slide can be provided on the substrate 100. Specifically, the clearance space includes a mounting groove 110 provided on the top side of the substrate 100. The bottom of the lever 220 is located in the mounting groove 110. The lever 220 can move along the length direction of the mounting groove 110. The top side of the lever 220 near the positioning hole 212 has a pressing part 221 that protrudes upward from the mounting groove 110. The pressing part 221 extends in the direction near the positioning hole 212. A mounting groove 110 for sliding mounting of the push block 220 is provided on the top side of the substrate 100. The bottom of the push block 220 is inserted into the mounting groove 110. At this time, the push block 220 can move along the length direction of the mounting groove 110, so that the push block 220 is slidably connected to the substrate 100. A pressing part 221 protruding from the mounting groove 110 is formed on the top side of the push block 220. The pressing part 221 extends in the direction close to the positioning hole 212. When the push block 220 reciprocates in the mounting groove 110, it can drive the pressing part 221 to move closer to or away from the mounting groove 110, thereby using the pressing part 221 to press and position the product or release the product.
[0031] When the lever 220 moves along the length of the mounting groove 110, it can clamp or release the product located in the positioning hole 212. For example, when the lever 220 moves in the mounting groove 110 in the direction close to the positioning hole 212, it can clamp the product located in the positioning hole 212. Preferably, in order to prevent the lever 220 from clamping the product with excessive force and damaging the product, when the lever 220 clamps the product, the lever 220 abuts against the end of the mounting groove 110 near the positioning hole 212, that is, when the lever 220 moves to the end of the stroke of the mounting groove 110, the limiting concave angle 224 formed between the lever 220 and the top pressing part 221 abuts against the mounting groove 110. At this time, the convex angle formed by the side wall of the mounting groove 110 and the limiting concave angle 224 cooperate with each other to limit the lever 220, thereby preventing the top pressing part 221 from excessively squeezing the product.
[0032] The top pressing part 221 is mainly used for pressing and positioning the product. The side of the top pressing part 221 facing the product can be a flat surface. If the product contacts the top pressing part 221 at a corner, the pressure at the contact point between the product and the top pressing part 221 will be too high and may easily damage the product. Therefore, in this embodiment, a positioning concave angle 222 is provided on the side of the top pressing part 221 corresponding to the positioning hole 212. For example, two positioning inclined surfaces are provided on the end face of the top pressing part 221. The two positioning inclined surfaces approach each other and are inclined towards the center of the top pressing part 221. The concave angle formed between the two positioning inclined surfaces is the positioning concave angle 222. In addition, an inner concave angle can be provided at the connection of the two positioning inclined surfaces to further avoid the corner of the product. The product is placed into the positioning hole 212, and the top pressing part 221 presses against the product. At this time, the positioning concave corner 222 on the top pressing part 221 can avoid the corner of the product, and the positioning concave corner 222 of the top pressing part 221 can limit the product, thereby improving the stability of pressing and positioning the product.
[0033] The product can be placed directly on the substrate 100 and come into contact with it. Since the substrate 100 is a rigid structure, the product is easily worn when placed on it. Therefore, to better protect the product, in this embodiment, the positioning unit 200 also includes a buffer pad 240. The buffer pad 240 is located between the cover plate 210 and the substrate 100, and the pressing part 221 is located above the buffer pad 240. The product is placed in the positioning hole 212, and the buffer pad 240 supports the product, thus improving the protective effect during product placement and positioning.
[0034] To facilitate the positioning and assembly of the cover plate 210 and the buffer pad 240 onto the substrate 100, in this embodiment, a plurality of positioning posts 120 are connected to the top side of the substrate 100. The cover plate 210 is provided with limiting holes 215 at the positions of the plurality of positioning posts 120. The plurality of positioning posts 120 pass through the buffer pad 240 and are inserted into the plurality of limiting holes 215. Naturally, a plurality of holes for the positioning posts 120 to pass through can be pre-set on the buffer pad 240, so that the positioning posts 120 can pass upward through the buffer pad 240. When assembling the positioning unit 200, the buffer pad 240 is aligned with the multiple limiting holes 215. First, the buffer pad 240 is placed on the substrate 100, and then the cover plate 210 is placed on the substrate 100. At this time, the multiple positioning posts 120 are aligned with the multiple limiting holes 215 to install and position the cover plate 210. This improves the convenience of installing and positioning the buffer pad 240 and the cover plate 210, thereby improving the installation effect of the entire positioning unit 200.
[0035] In the above embodiment, when the cover plate 210 is connected to the substrate 100, the cover plate 210 will press the buffer pad 240 tightly onto the substrate 100. This will elastically compress the buffer pad 240, reducing its elastic cushioning effect. Therefore, in this embodiment, if... Figure 4 As shown, a storage groove 213 is provided on the bottom side of the cover plate 210 corresponding to the position of the buffer pad 240. When assembling the cover plate 210, the buffer pad 240 on the bottom side of the cover plate 210 and the storage groove 213 are directly opposite each other. When the cover plate 210 is connected to the substrate 100, the buffer pad 240 is stored in the storage groove 213, thereby preventing the cover plate 210 from pressing and deforming the buffer pad 240, which helps to ensure that the buffer pad 240 can provide elastic cushioning function.
[0036] To facilitate product inspection and other operations from below the substrate 100, a structure connecting the bottom of the product can be formed on the substrate 100. Specifically, a first through hole 130 is provided on the substrate 100 corresponding to the positioning hole 212, and a second through hole 241 is provided on the buffer pad 240 corresponding to the first through hole 130. The areas of the first through hole 130 and the second through hole 241 are smaller than the area of the positioning hole 212. In practical applications, the first through hole 130 and the second through hole 241 are equal in size, face each other, and are located in the middle of the positioning hole 212. At this time, the buffer pad 240, located on the periphery of the second through hole 241, provides uniform support force to the product. A first through hole 130 is provided on the substrate 100 at the position corresponding to the positioning hole 212. Similarly, a second through hole 241 is provided on the buffer pad 240. When the product is placed in the positioning hole 212, the buffer pad 240 supports the product at the position outside the second through hole 241. The product can be observed and inspected through the first through hole 130 and the second through hole 241 below, which improves the overall ease of use.
[0037] The elastic element 230 is mainly used to provide elastic pressing force to the lever 220. It has various structural forms; for example, the elastic element 230 can be made of rubber, elastic metal sheet, etc. In this embodiment, the elastic element 230 is a spring. The lever 220 has a first groove 223 corresponding to the spring position, and the mounting groove 110 has a second groove 111 corresponding to the spring position on one side. The two ends of the spring are respectively inserted into the first groove 223 and the second groove 111. The spring provides the elastic force to press and position the lever 220. A first groove 223 is provided at the end of the lever 220 to install and position one end of the spring. Similarly, a second groove 111 is provided on one side of the mounting groove 110 to install and position the other end of the spring. This allows for quick installation and positioning of the spring and prevents relative torsion of the spring during installation.
[0038] When an external force needs to be applied to the lever 220 to make it slide, the force can be applied from above the substrate 100. Since the product is also picked up and placed from above the substrate 100, in order to make the overall structural arrangement more reasonable, the external force can be applied to the lever 220 from below the substrate 100. Therefore, a structure for connecting and avoiding the lever 220 needs to be provided on the substrate 100 to facilitate the peripheral device's drive structure to control the movement of the lever 220. Specifically, the substrate 100 is provided with a lower avoidance hole 112 corresponding to the position of the lever 220, and the lower avoidance hole 112 extends along the moving direction of the lever 220. The peripheral device's drive unit can pass through the lower avoidance hole 112 on the bottom side of the substrate 100 to connect to the lever 220, thereby applying an external force to the lever 220. In this way, the lever 220 in multiple positioning units 200 can be driven from the bottom side of the substrate 100, while the product is picked up and placed from above the substrate 100, reducing interference between structural components and making the overall design more reasonable.
[0039] The clearance space for the toggle block 220 can be provided only in the clearance groove 211 on the bottom side of the cover plate 210, or it can be further provided in the bottom side of the cover plate 210 as well as in the clearance space for the toggle block 220. Specifically, the clearance space includes the clearance groove 211 provided on the bottom side of the cover plate 210, and the bottom of the clearance groove 211 is provided with an upper clearance hole 214, which extends along the length of the toggle block 220. The upper clearance hole 214 makes it easy to observe the movement state of the toggle block 220, thereby better judging the clamping and loosening state of the product and improving the user experience.
[0040] In practical applications, multiple positioning units 200 can position multiple products respectively. Multiple positioning units 200 can be arranged longitudinally and laterally on the substrate 100. In order to facilitate the connection and fixation of the substrate 100 to the structure of the peripheral device, a connection hole for inserting a connector is provided on the substrate 100. In order to facilitate the placement of the substrate 100, a support foot is connected to the bottom side of the substrate 100. There are multiple support feet, for example, support feet are connected to the four corners of the bottom side of the substrate 100.
[0041] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims
1. A product positioning fixture, characterized by: The utility model relates to a positioning unit (200) and a substrate (100) comprising the positioning unit (200), the positioning unit (200) comprises a cover plate (210), a knob (220) and an elastic member (230), the knob (220) is slidably connected to the top side of the substrate (100), the cover plate (210) is connected to the top side of the substrate (100), an avoiding space for avoiding the knob (220) is formed between the cover plate (210) and the substrate (100), the cover plate (210) is provided with a positioning hole (212) communicated with the avoiding space, the elastic member (230) abuts between the knob (220) and the substrate (100), the elastic member (230) has the tendency of pressing the knob (220) to the positioning hole (212), and the number of the positioning unit (200) is multiple. The avoiding space comprises a mounting groove (110) arranged on the top side of the substrate (100), the bottom of the knob (220) is located in the mounting groove (110), the knob (220) can move along the length direction of the mounting groove (110), and the top side of one end of the knob (220) close to the positioning hole (212) has a top pressing part (221) protruding upward from the top of the mounting groove (110), and the top pressing part (221) extends towards the direction close to the positioning hole (212). The top pressing part (221) is provided with a positioning concave corner (222) on the side corresponding to the positioning hole (212).
2. The product positioning fixture of claim 1, wherein: The positioning unit (200) further comprises a buffer pad (240), the buffer pad (240) is located between the cover plate (210) and the substrate (100), and the top pressing part (221) is located above the buffer pad (240).
3. The product positioning fixture of claim 2, wherein: The top side of the substrate (100) is connected with multiple positioning columns (120), the cover plate (210) is provided with multiple limiting holes (215) corresponding to the positions of the multiple positioning columns (120), and the multiple positioning columns (120) respectively pass through the buffer pad (240) and are inserted into the multiple limiting holes (215).
4. The product positioning fixture of claim 2, wherein: The bottom side of the cover plate (210) is provided with a receiving groove (213) corresponding to the position of the buffer pad (240).
5. The product positioning fixture of claim 4, wherein: The substrate (100) is provided with a first through hole (130) corresponding to the position of the positioning hole (212), the buffer pad (240) is provided with a second through hole (241) corresponding to the position of the first through hole (130), and the areas of the first through hole (130) and the second through hole (241) are respectively smaller than the area of the positioning hole (212).
6. The product positioning fixture of claim 4, wherein: The elastic member (230) is a spring, the knob (220) is provided with a first groove (223) corresponding to the position of the spring, one side of the mounting groove (110) is provided with a second groove (111) corresponding to the position of the spring, and the two ends of the spring are respectively inserted into the first groove (223) and the second groove (111).
7. The product positioning fixture of claim 4, wherein: The substrate (100) is provided with a lower avoiding hole (112) corresponding to the position of the knob (220), and the lower avoiding hole (112) extends along the moving direction of the knob (220).
8. The product positioning fixture of claim 2, wherein: 9. The product positioning fixture of claim 1, wherein: 10. The product positioning fixture of claim 1, wherein: The avoiding space comprises an avoiding groove (211) arranged at the bottom side of the cover plate (210), and the groove bottom of the avoiding groove (211) is provided with an upper avoiding hole (214), and the upper avoiding hole (214) extends along the length direction of the pushing block (220).