Gutter channel manufacturing tool
By employing a structure with alternating dies and punches and a limiting structure in the tooling for manufacturing water tanks, multiple parts can be produced on a single tooling, solving the problems of large tooling quantity and low material utilization in existing technologies, reducing production costs and improving material utilization.
Patent Information
- Application Number
- CN202520311643.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-25
AI Technical Summary
In the existing technology, manufacturing a water tank requires at least two sets of manufacturing tools, which leads to increased tooling and processing costs, reduced material utilization, and increased production costs.
Design a tooling for manufacturing water tanks, which adopts a structure with alternating dies and punches. The dies and punches are provided with multiple forming areas to accommodate parts with different material properties and thicknesses. Multiple parts are formed by a single stamping, and the movement of the splice seams is restricted by a limiting structure and a positioning clamping block, so as to realize the production of multiple parts on a set of tooling.
It effectively reduces the number of tooling and processing steps, lowers processing costs, improves material utilization, reduces overall procurement costs, and ensures the forming quality of parts.
Smart Images

Figure CN223819480U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water tank manufacturing technology, and in particular to a water tank manufacturing tooling. Background Technology
[0002] In the process of automobile design and production, in order to ensure the convenience of after-sales maintenance, the water channel usually needs to be disassembled. Therefore, the water channel includes at least two parts, and the material properties and thickness of the at least two parts are different. Therefore, at least two sets of manufacturing tooling are required when manufacturing the water channel, which will increase tooling and processing costs, reduce material utilization, and increase production costs. Summary of the Invention
[0003] This invention provides a tooling for manufacturing water tanks, which solves the problem that in the prior art, at least two sets of tooling are required when manufacturing water tanks, which increases tooling and processing costs, reduces material utilization, and increases production costs.
[0004] A flow channel manufacturing fixture, the flow channel including at least two components, the separate plates of the at least two components being spliced together to form a stamping plate, the flow channel manufacturing fixture including a die and a punch arranged at intervals along a first direction, the die and the punch being used to place the stamping plate;
[0005] The die cavity is provided with at least two spaced-apart die forming areas;
[0006] The punch is provided with at least two punch forming areas arranged at intervals;
[0007] Each of the said concave forming areas is arranged opposite to a said convex forming area, and a space is formed between them to accommodate a split plate of the component;
[0008] When the die and the punch move toward each other, they press the sheet material to be stamped to form at least two parts.
[0009] Preferably, at least two of the components include a first component, a second component, and two third components;
[0010] At least two die forming areas include a first die forming area, a second die forming area, and two symmetrically arranged third die forming areas; the first die forming area and the second die forming area are spaced apart along a second direction, and the two third die forming areas are respectively located on both sides of the first die forming area and the second die forming area;
[0011] The at least two punch forming areas include a first punch forming area, a second punch forming area, and two symmetrically arranged third punch forming areas; the first punch forming area and the second punch forming area are spaced apart along a second direction, and the two third punch forming areas are respectively located on both sides of the first punch forming area and the second punch forming area;
[0012] The first die forming area and the first punch forming area cooperate to form a first part space for accommodating the first component, the second die forming area and the second punch forming area cooperate to form a second part space for accommodating the second component, and the third die forming area and the third punch forming area cooperate to form a third part space for accommodating the third component.
[0013] Preferably, the distance between the first part space and the second part space is 20-40mm, and the distance between the first part space and the third part space is 15-25mm.
[0014] Preferably, there is a seam between the two adjacent separate plates of the component on the sheet material to be stamped;
[0015] The water trough manufacturing fixture also includes a limiting structure, which is disposed between the concave mold and the convex mold to limit the splice seam.
[0016] Preferably, the limiting structure includes a limiting groove and a rib;
[0017] The limiting groove is disposed on the concave mold, the protruding rib is disposed on the convex mold, and the limiting groove is engaged with the protruding rib;
[0018] Alternatively, the limiting groove is disposed on the punch, the rib is disposed on the die, and the limiting groove is engaged with the rib.
[0019] Preferably, the centerline of the limiting groove and the splice seam coincide on a plane perpendicular to the first direction.
[0020] Preferably, the width of the limiting groove is 8-12mm and the depth of the limiting groove is 5-8mm.
[0021] Preferably, the water tank manufacturing fixture further includes a positioning and clamping block;
[0022] The positioning and clamping block is installed on the concave mold, and the limiting structure is disposed between the positioning and clamping block and the convex mold.
[0023] Preferably, the punch is further provided with a countersunk groove, and one end of the positioning and clamping block is engaged with the countersunk groove;
[0024] The limiting structure is disposed between the second end of the positioning and clamping block and the sink groove.
[0025] Preferably, the water tank manufacturing fixture further includes a cover plate and a nitrogen spring;
[0026] The cover plate is installed on the concave mold, one end of the nitrogen spring is connected to the cover plate, and the other end of the nitrogen spring is connected to the positioning and clamping block.
[0027] The water tank manufacturing fixture provided in this embodiment of the utility model is used to manufacture water tanks. By providing at least two die forming areas on the die cavity and at least two punch forming areas on the punch, at least two parts can be produced in one stamping operation. Parts with different material properties and thicknesses can be produced on one set of fixtures. Integrating at least two sets of fixtures into one set of fixtures can effectively reduce the number of fixtures, processing steps and processing costs; at the same time, it can reduce the weight of sheet metal, reduce sheet metal costs, improve material utilization, and greatly reduce the overall procurement cost. Attached Figure Description
[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a cross-sectional view of a water tank manufacturing fixture in one embodiment of this utility model;
[0030] Figure 2 This is a top view of the punch in one embodiment of the present invention;
[0031] Figure 3 yes Figure 2 A magnified view of a portion of the image;
[0032] Figure 4 yes Figure 3 Cross-sectional view;
[0033] Figure 5 This is a schematic diagram of the sheet metal to be stamped in one embodiment of this utility model;
[0034] Figure 6 yes Figure 1 Enlarged view of point A in the middle.
[0035] Among them, 1. sheet metal to be stamped; 11. split sheet metal; 12. splicing seam; 2. die cavity; 21. die cavity forming area; 3. punch; 31. punch forming area; 311. first punch forming area; 312. second punch forming area; 313. third punch forming area; 32. countersunk groove; 4. pressure ring; 5. limiting structure; 51. limiting groove; 52. rib; 6. positioning clamping block; 7. cover plate; 8. nitrogen spring. Detailed Implementation
[0036] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0037] In the description of this invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.
[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0039] This utility model embodiment provides a tooling for manufacturing a water tank, referring to... Figure 1 , Figure 2 and Figure 5The flow channel includes at least two components. The separate sheet metal 11 of the at least two components is spliced together to form a sheet metal 1 to be stamped. The flow channel manufacturing fixture includes a die 2 and a punch 3 arranged at intervals along a first direction. The space between the die 2 and the punch 3 is used to place the sheet metal 1 to be stamped. The die 2 has at least two die forming areas 21 arranged at intervals; the punch 3 has at least two punch forming areas 31 arranged at intervals. Each die forming area 21 is opposite to a punch forming area 31, forming a space between them to accommodate a separate sheet metal 11 of a component. When the die 2 and the punch 3 move towards each other, they stamp the sheet metal 1 to be stamped to form at least two components. The first direction is the working direction of the flow channel manufacturing fixture, which is the movement direction of the die 2, specifically the up-down direction.
[0040] As an example, a water channel manufacturing fixture is used to manufacture water channels, such as a front engine compartment water channel. To facilitate disassembly and maintenance, the water channel is divided into parts. The water channel includes at least two components. The separate plates 11 of the at least two components are spliced together to form a stamping plate 1. Specifically, the separate plates 11 with different material properties and thicknesses are laser-welded to form the stamping plate 1. The stamping plate 1 is then stamped by the water channel manufacturing fixture to form the water channel. The tooling for manufacturing the water tank includes a die 2 and a punch 3. During installation, the die 2 and the punch 3 are arranged at intervals along a first direction, and the sheet metal 1 to be stamped is placed between the die 2 and the punch 3. The die 2 is provided with at least two spaced die forming areas 21, and the punch 3 is provided with at least two spaced punch forming areas 31. Each die forming area 21 is opposite to a punch forming area 31, and a space for accommodating a split sheet metal 11 of a component is formed between them. With this arrangement, when the die 2 and the punch 3 move towards each other, the sheet metal 1 to be stamped can be stamped to form at least two components and scrap. After the scrap is cut off, at least two components, i.e., the water tank, can be obtained. Compared with existing technologies, the drainage channel manufacturing fixture in this example, by having at least two die forming areas 21 on the die 2 and at least two punch forming areas 31 on the punch 3, can achieve the production of at least two parts in a single stamping operation. Parts with different material properties and thicknesses can be produced on one set of fixtures. Integrating at least two sets of fixtures into one set can effectively reduce the number of fixtures, processing steps, and processing costs; at the same time, it reduces the weight of sheet metal, reduces sheet metal costs, improves material utilization, and greatly reduces the overall procurement cost. In addition, the drainage channel manufacturing fixture also includes a pressure ring 4; the pressure ring 4 is located on the periphery of the punch 3 and abuts against the sheet metal 1 to be stamped, preventing wrinkling of the workpiece wall or flange during the stamping process, and controlling the flow of the sheet metal 1 to be stamped, so as to ensure the forming quality of the parts and the material utilization rate.
[0041] In one embodiment, reference is made to Figure 1 , Figure 2 and Figure 3The system comprises at least two components, including a first component, a second component, and two third components; at least two die forming areas 21, including a first die forming area, a second die forming area, and two symmetrically arranged third die forming areas; the first die forming area and the second die forming area are spaced apart along a second direction, and the two third die forming areas are located on opposite sides of the first die forming area and the second die forming area, respectively; and at least two punch forming areas 31, including a first punch forming area 311, a second punch forming area 312, and two symmetrically arranged third punch forming areas 313. The first punch forming area 311 and the second punch forming area 312 are spaced apart along the second direction, and two third punch forming areas 313 are located on both sides of the first punch forming area 311 and the second punch forming area 312, respectively. The first die forming area and the first punch forming area 311 cooperate to form a first part space for accommodating the first component, the second die forming area and the second punch forming area 312 cooperate to form a second part space for accommodating the second component, and the third die forming area and the third punch forming area 313 cooperate to form a third part space for accommodating the third component. The second direction is perpendicular to the first direction, and the second direction is perpendicular to the direction of the flow channel manufacturing fixture, that is, the horizontal direction of the die 2, specifically the left-right direction or the front-back direction.
[0042] As an example, at least two die forming areas 21 include a first die forming area, a second die forming area, and two third die forming areas; in the arrangement, the first die forming area and the second die forming area are spaced apart along a second direction, and the two third die forming areas are respectively located on both sides of the first die forming area and the second die forming area, and the two third die forming areas are symmetrically arranged; at least two punch forming areas 31 include a first punch forming area 311, a second punch forming area 312, and two third punch forming areas 313; in the arrangement, the first punch forming area 311 and the second punch forming area 312 are spaced apart along a second direction, and the two third punch forming areas 313 are respectively located on both sides of the first punch forming area 311 and the second punch forming area 312, and the two third punch forming areas 313 are symmetrically arranged. At least two components are specifically the front nacelle water channel, including a first component, a second component, and two third components. The first die forming area and the first punch forming area 311 cooperate to form a first part space to accommodate the first component, the second die forming area and the second punch forming area 312 cooperate to form a second part space to accommodate the second component, and the third die forming area and the third punch forming area 313 cooperate to form a third part space to accommodate the third component. With this arrangement, four components are arranged on a set of tooling, and the relative position of each component is consistent with that before disassembly. By providing a first die forming area, a second die forming area, and two third die forming areas on the die 2, and providing a first punch forming area 311, a second punch forming area 312, and two third punch forming areas 313 on the punch 3, four components can be stamped in one operation. Components with different material properties and thicknesses are produced on a set of tooling. Integrating three sets of tooling into one set of tooling can effectively reduce the number of tooling and processing costs, improve material utilization, and greatly reduce the overall procurement cost.
[0043] In one embodiment, reference is made to Figure 3 The distance between the first part space and the second part space is 20-40mm, and the distance between the first part space and the third part space is 15-25mm.
[0044] As an example, in the design, the distance L1 between the first part space and the second part space is 20-40mm, and the distance L2 between the first part space and the third part space is 15-25mm. Specifically, the distance between the first die forming area and the second die forming area is 20-40mm, the distance between the first die forming area and the third die forming area is 15-25mm, the distance between the first punch forming area 311 and the second punch forming area 312 is 20-40mm, and the distance between the first punch forming area 311 and the third punch forming area 313 is 15-25mm. This setting can constrain the relative positions of each forming area on the die 2 and the punch 3, ensuring that the scrap part of the sheet metal 1 to be stamped will not move to the forming area of the part, thus avoiding affecting the forming of the flow channel.
[0045] In one embodiment, reference is made to Figure 1 , Figure 3 , Figure 5 and Figure 6 On the sheet material 1 to be stamped, there is a splicing seam 12 between the two separate sheet materials 11 of adjacent parts; the water channel manufacturing tooling also includes a limiting structure 5, which is set between the die 2 and the punch 3 to limit the splicing seam 12.
[0046] As an example, on the sheet metal 1 to be stamped, there is a seam 12 between the two adjacent parts of the separate sheet metal 11. Specifically, the separate sheet metal 11 with different material properties and thicknesses are laser-welded and stamped on a set of tooling. Unlike conventional sheet metal welding processes where the weld seam is located on the product and remains there, in this example, the seam 12 is on the scrap material between the products. The scrap material and the seam 12 will be removed together in the subsequent process to obtain a final product without the seam 12. The water tank manufacturing tooling also includes a limiting structure 5. During installation, the limiting structure 5 is set between the die 2 and the punch 3. This setting limits the seam 12 when the die 2 and the punch 3 move towards each other, restricting the movement of the seam 12 and preventing it from sliding into the forming area of the part, thus affecting the water tank manufacturing.
[0047] In one embodiment, reference is made to Figure 1 , Figure 4 and Figure 6 The limiting structure 5 includes a limiting groove 51 and a rib 52; the limiting groove 51 is disposed on the die 2, the rib 52 is disposed on the punch 3, and the limiting groove 51 and the rib 52 are engaged; or, the limiting groove 51 is disposed on the punch 3, the rib 52 is disposed on the die 2, and the limiting groove 51 and the rib 52 are engaged.
[0048] As an example, the limiting structure 5 includes a limiting groove 51 and a protruding rib 52. During installation, the limiting groove 51 is set on the die 2, and the protruding rib 52 is set on the punch 3. With this arrangement, the limiting groove 51 and the protruding rib 52 engage, and the protruding rib 52 precisely presses the splice seam 12 into the limiting groove 51. When the die 2 and the punch 3 move towards each other, the splice seam 12 is limited, restricting its movement and preventing it from sliding into the forming area of the component, thus affecting the manufacturing of the flow channel. In another example, the limiting groove 51 is set on the punch 3, and the protruding rib 52 is set on the die 2, with the limiting groove 51 and the protruding rib 52 engaging, achieving the same function.
[0049] In one embodiment, reference is made to Figure 3 The centerline of the limiting groove 51 and the splice seam 12 coincide on a plane perpendicular to the first direction. As an example, the centerline of the limiting groove 51 and the splice seam 12 coincide on a plane perpendicular to the first direction. This arrangement can effectively limit the movement of the splice seam 12, that is, limit the movement of the sheet metal to be stamped 1, and prevent the splice seam 12 from sliding into the forming area of the part and affecting the manufacturing of the flow channel.
[0050] In one embodiment, reference is made to Figure 4 The width of the limiting groove 51 is 8-12mm, and the depth of the limiting groove 51 is 5-8mm.
[0051] As an example, the size of the limiting groove 51 is limited. Specifically, the width of the limiting groove 51, L3, is 8-12mm, and the depth of the limiting groove 51, H, is 5-8mm. This setting can effectively limit the movement of the splice seam 12, that is, limit the movement of the sheet metal to be stamped 1, and prevent the splice seam 12 from sliding into the forming area of the part and affecting the manufacturing of the flow channel.
[0052] In one embodiment, reference is made to Figure 1 , Figure 3 and Figure 6 The tooling for manufacturing the water channel also includes a positioning and clamping block 6; the positioning and clamping block 6 is installed on the die 2, and the limiting structure 5 is set between the positioning and clamping block 6 and the punch 3.
[0053] As an example, the tooling for manufacturing the water tank also includes a positioning and clamping block 6. During installation, the positioning and clamping block 6 is installed on the die 2, and the limiting structure 5 is set between the positioning and clamping block 6 and the punch 3. In this configuration, the positioning and clamping block 6 is designed at a position on the die 2 corresponding to the splice seam 12, specifically at the intersection of at least two splice seams 12. The positioning and clamping block 6 can guide and limit the fit between the die 2 and the punch 3. The limiting structure 5 is set between the positioning and clamping block 6 and the punch 3. When the die 2 and the punch 3 move towards each other, the limiting structure 5 is used to limit the splice seam 12, effectively restricting the movement of the splice seam 12, that is, restricting the movement of the sheet metal 1 to be stamped, and preventing the splice seam 12 from sliding into the forming area of the part and affecting the manufacturing of the water tank.
[0054] In one embodiment, reference is made to Figure 6 The punch 3 is also provided with a recess 32, and one end of the positioning and clamping block 6 is engaged with the recess 32; the limiting structure 5 is provided between the second end of the positioning and clamping block 6 and the recess 32.
[0055] As an example, a recess 32 is also provided on the punch 3, and one end of the positioning clamping block 6 is engaged with the recess 32. With this arrangement, the engagement of the positioning clamping block 6 with the recess 32 can guide and limit the cooperation between the die 2 and the punch 3. The limiting structure 5 is set between the second end of the positioning clamping block 6 and the recess 32. When the die 2 and the punch 3 move towards each other, the limiting structure 5 is used to limit the splice seam 12, effectively restricting the movement of the splice seam 12. That is, it restricts the movement of the sheet metal 1 to be stamped, preventing the splice seam 12 from sliding into the forming area of the part and affecting the manufacturing of the flow channel.
[0056] In one embodiment, reference is made to Figure 1 The tooling for manufacturing the water tank also includes a cover plate 7 and a nitrogen spring 8; the cover plate 7 is installed on the die 2, one end of the nitrogen spring 8 is connected to the cover plate 7, and the other end of the nitrogen spring 8 is connected to the positioning and clamping block 6.
[0057] As an example, the tooling for manufacturing the flow channel also includes a cover plate 7 and a nitrogen spring 8. During installation, the cover plate 7 is installed on the die 2 to provide support for the nitrogen spring 8. One end of the nitrogen spring 8 is connected to the cover plate 7, and the other end of the nitrogen spring 8 is connected to the positioning and clamping block 6. With this configuration, when the die 2 and the punch 3 move towards each other, the nitrogen spring 8 drives the positioning and clamping block 6 to contact the sheet metal 1 to be stamped before the die 2. The two intersecting seams 12 are pressed into the limiting groove 51 of the punch 3 by the rib 52, which positions the sheet metal 1 to be stamped and restricts the movement of the seams 12, preventing the seams 12 from sliding into the forming area of the parts and affecting the manufacturing of the flow channel.
[0058] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.
Claims
1. A tooling for manufacturing a flow channel, the flow channel comprising at least two components, wherein the separate plates of the at least two components are spliced together to form a sheet material to be stamped, characterized in that, The water tank manufacturing fixture includes a concave die and a convex die arranged at intervals along a first direction, with the space between the concave die and the convex die used to place the sheet material to be stamped; The die cavity is provided with at least two spaced-apart die forming areas; The punch is provided with at least two punch forming areas arranged at intervals; Each of the said concave forming areas is arranged opposite to a said convex forming area, and a space is formed between them to accommodate a split plate of the component; When the die and the punch move toward each other, they press the sheet material to be stamped to form at least two parts.
2. The tooling for manufacturing a water tank according to claim 1, characterized in that, At least two of the components include a first component, a second component, and two third components; At least two die forming areas include a first die forming area, a second die forming area, and two symmetrically arranged third die forming areas; The first die forming area and the second die forming area are spaced apart along the second direction, and the two third die forming areas are respectively located on both sides of the first die forming area and the second die forming area; The at least two punch forming areas include a first punch forming area, a second punch forming area, and two symmetrically arranged third punch forming areas; the first punch forming area and the second punch forming area are spaced apart along a second direction, and the two third punch forming areas are respectively located on both sides of the first punch forming area and the second punch forming area; The first die forming area and the first punch forming area cooperate to form a first part space for accommodating the first component, the second die forming area and the second punch forming area cooperate to form a second part space for accommodating the second component, and the third die forming area and the third punch forming area cooperate to form a third part space for accommodating the third component.
3. The tooling for manufacturing a water tank according to claim 2, characterized in that, The distance between the first part space and the second part space is 20-40mm, and the distance between the first part space and the third part space is 15-25mm.
4. The tooling for manufacturing a water tank according to claim 1, characterized in that, On the sheet material to be stamped, there is a splicing seam between the two separate sheet materials of adjacent components; The water trough manufacturing fixture also includes a limiting structure, which is disposed between the concave mold and the convex mold to limit the splice seam.
5. The tooling for manufacturing a water tank according to claim 4, characterized in that, The limiting structure includes a limiting groove and a protruding rib; The limiting groove is disposed on the concave mold, the protruding rib is disposed on the convex mold, and the limiting groove is engaged with the protruding rib; Alternatively, the limiting groove is disposed on the punch, the rib is disposed on the die, and the limiting groove is engaged with the rib.
6. The tooling for manufacturing a water tank according to claim 5, characterized in that, The centerline of the limiting groove and the splice seam coincide on a plane perpendicular to the first direction.
7. The tooling for manufacturing a water tank according to claim 5, characterized in that, The width of the limiting groove is 8-12mm, and the depth of the limiting groove is 5-8mm.
8. The tooling for manufacturing a water tank according to claim 4, characterized in that, The tooling for manufacturing the water tank also includes a positioning and clamping block; The positioning and clamping block is installed on the concave mold, and the limiting structure is disposed between the positioning and clamping block and the convex mold.
9. The tooling for manufacturing a water tank according to claim 8, characterized in that, The punch is also provided with a countersunk groove, and one end of the positioning and clamping block is engaged with the countersunk groove; The limiting structure is disposed between the second end of the positioning and clamping block and the sink groove.
10. The tooling for manufacturing a water tank according to claim 8, characterized in that, The tooling for manufacturing the water tank also includes a cover plate and a nitrogen spring; The cover plate is installed on the concave mold, one end of the nitrogen spring is connected to the cover plate, and the other end of the nitrogen spring is connected to the positioning and clamping block.