Front wall plate lower cross beam forming die

Abstract

The invention discloses a front wall plate lower cross beam forming die which is characterized in that a concave groove is formed in the center of the top of a lower die block, a die ridge protruding upwards is arranged in the center of the groove bottom of the groove, and the top end face of the lower die block allows a plate to be flatly placed at the notch end of the groove; the upper die block comprises a die frame and a pair of sliding die blocks, one side of the die frame is provided with a sliding hole allowing the first sliding die block to be vertically and slidably installed, and the other side of the die frame is provided with a notch allowing the second sliding die block to vertically slide. The upper die block gets close to the lower die block through a driving mechanism, and the driving mechanism enables the die frame to be vertically pressed down to a plate horizontally placed on the top end face of the lower die block before the two sliding die blocks, so that the middle section of the plate is firstly pressed down to the position in extrusion contact with the die ridge. And then the side edge sections on the front side and the rear side of the plate are extruded to the groove bottoms of the grooves in the front side and the rear side of the mold ridge by the two sliding mold blocks to form the front wall plate lower cross beam. It can be ensured that the front wall plate lower cross beam is stably and reliably punched and formed.

Description

Technical Field

[0001] This invention relates to the field of stamping equipment for automotive parts, specifically a forming mold for the lower crossbeam of the front panel. Background Technology

[0002] The structure of a crossbeam under the front panel of a car is as follows: Figures 1-2 As shown, its main structure consists of a raised central ridge and side wings arranged on both sides. When manufacturing the lower crossbeam of the front wall panel, the current practice is to place the cut rectangular sheet or the rectangular sheet after partial punching on a lower module that matches the bottom of a mold cavity and the lower crossbeam of the front wall panel. The upper module of the corresponding shape moves down directly, and the sheet placed on the end face of the lower mold is stamped into the lower crossbeam of the front wall panel in one go.

[0003] In the existing processing steps described above, because the lower crossbeam of the front panel is a relatively large, concave, and curved sheet metal part, the sheet metal on the lower module is prone to misalignment when contacting the upper module during stamping, leading to forming failure. Alternatively, during stamping, due to the complex shape of the lower crossbeam of the front panel, with its uneven and large-angle bending features, this rapid one-step stamping process can easily cause local wrinkles or localized stress concentrations leading to cracks or even breakage. Therefore, although the stamping equipment used has a simple overall structure and extremely high stamping efficiency, the forming quality is unstable and prone to a series of the aforementioned defects. Summary of the Invention

[0004] In view of the above-mentioned technical status, the purpose of this invention is to provide a front wall panel lower crossbeam forming mold to better solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention employs a front wall panel lower crossbeam forming mold, comprising an upper mold and a lower mold, each mold having a mounting base. A lower module is fixed on the lower mounting base of the lower mold, and an upper module is mounted on the upper mounting base of the upper mold. The lower module has a recessed groove at the center of its top, and a raised mold ridge at the center of the bottom of the groove. The top surface of the lower module allows the sheet material to be placed flat at the groove opening. The upper module includes a mold frame and a pair of sliding modules. One side of the mold frame has a sliding hole for the vertical sliding installation of the first sliding module, and the other side has a notch for the vertical sliding of the second sliding module. The upper module moves towards the lower module via a driving mechanism. This driving mechanism causes the mold frame to be pressed vertically down onto the sheet material placed flat on the top surface of the lower module before the two sliding modules, so that the middle section of the sheet material is pressed down first to the position of contact with the mold ridge. The side sections on the front and rear sides of the sheet material are then pressed by the two sliding modules onto the bottom of the groove on the front and rear sides of the mold ridge to form the front wall panel lower crossbeam.

[0006] Furthermore, the mold frame includes a ∏-shaped frame body and a sliding pressure plate that is vertically slidably installed inside the frame body. The sliding pressure plate is also elastically connected to the frame body by a vertically arranged pressure-resistant spring. The sliding pressure plate separates the sliding hole and the notch.

[0007] When the driving mechanism drives the mold frame to move downward, the frame body and the sliding pressure plate simultaneously reach the position where they contact the plate at the top of the groove, and apply the driving force to the top surface of the sliding pressure plate. This causes the sliding pressure plate to continue moving downward while the frame body presses the two ends of the plate, thus bending the middle section of the plate downward. During this process, the two sliding modules always maintain relative sliding contact with the sliding pressure plate, and the sliding pressure plate always moves downward relative to the two sliding modules until the lower crossbeam of the front wall panel is formed.

[0008] Furthermore, the vertical displacement of the sliding pressure plate relative to the two sliding modules is not greater than the thickness of the sheet material.

[0009] Furthermore, the driving mechanism includes at least one first hydraulic cylinder, a second hydraulic cylinder, and a third hydraulic cylinder, wherein the first hydraulic cylinder is connected to the top of the sliding pressure plate, the second hydraulic cylinder is connected to the top of the first sliding plate, and the third hydraulic cylinder is connected to the top of the second sliding plate. The extension speed of the piston rod of the first hydraulic cylinder is faster than the extension speed of the piston rods of the second and third hydraulic cylinders.

[0010] Furthermore, each of the two opposite sides of the sliding pressure template has a positioning step, and the side of the sliding module opposite to the sliding pressure template has a protrusion to form a positioning boss on the side of the sliding module. When the sliding block moves to the point where its positioning boss fits into the positioning step surface, the lower crossbeam of the front wall panel is formed.

[0011] Furthermore, the sliding module is provided with several suction holes, which are used to connect with the negative pressure device. The bottom end of the suction hole is provided with a suction cup that adsorbs and contacts the front and rear sides of the lower crossbeam of the front wall panel. During the process of the sliding module extruding the lower crossbeam of the front wall panel, the suction cup adsorbs and connects with the lower crossbeam of the front wall panel so that the formed lower crossbeam of the front wall panel can be taken out during demolding.

[0012] Furthermore, the sliding pressure plate has an extension section on the top side, which is vertically slidably installed in a groove on the inner wall of the frame body. The bottom of the groove is connected to the extension section by a pressure-resistant spring.

[0013] Furthermore, a guide rod is coaxially provided inside the pressure spring, with its top end fixed to the extension section and its bottom end sliding through the bottom of the frame body.

[0014] Furthermore, the top surface of the lower module has a guide blind hole, and the bottom end of the guide rod slides into the guide blind hole. The pressure-resistant spring ensures that when the upper module is freely positioned above the top of the lower mold in the initial state, the bottom of the sliding pressure plate is flush with the top surface of the frame body, and the bottom end of the guide rod never leaves the bottom of the groove.

[0015] Furthermore, the lower module includes a middle module and side modules located on both sides thereon. The middle module and side modules are surrounded by several L-shaped pressure arms, and horizontally arranged pressure plates press downwards onto the lower template to achieve combined installation.

[0016] The present invention discloses a front wall panel lower crossbeam forming mold. By combining the upper mold with the upper module, the corresponding stamping action is split up. First, the mold frame and sliding module of the upper module are used to stamp the central convex ridge and side wings of the front wall panel lower crossbeam respectively. The forming is carried out in steps to avoid excessive concentrated stress on the entire sheet. The mold frame forms the central convex ridge first, and then forms the side wings, so that the deformed sheet has both stress release and deformation release space.

[0017] More specifically, the frame body of the mold frame of the present invention extrudes the sheet metal on the lower die to fix the sheet metal and prevent it from deviating during stamping; secondly, the sliding plate of the mold frame moves downward relative to the frame body to ensure that the sheet metal is fixed before the forming of the central convex ridge begins; furthermore, the sliding module moves downward asynchronously relative to the sliding plate to ensure that the sliding plate forms the central convex ridge first, and then the side wing is finally extruded and formed, thereby ensuring the forming quality of the lower crossbeam of the front wall panel, fully releasing the stress generated by the deformation of the sheet metal during stamping, and providing sufficient deformation space. Attached Figure Description

[0018] The following are auxiliary illustrations used to explain some specific embodiments of the present invention. The accompanying drawings mainly describe the principles of specific operation execution structures or methods of some embodiments of the present invention, but this does not mean that the physical structure or operation steps of the present invention can only be as shown in the figures.

[0019] Figures 1-2 This is a three-dimensional structural diagram of the lower crossbeam of the front wall panel of the present invention;

[0020] Figure 3 This is a three-dimensional structural diagram of a front wall panel lower crossbeam forming mold according to the present invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the front wall panel lower crossbeam forming mold of the present invention after removing the upper template;

[0022] Figure 5 This is a structural diagram showing the formation of the lower crossbeam of the front wall panel when the upper and lower modules are combined.

[0023] Figure 6 This is a schematic diagram showing that the upper and lower modules move down asynchronously.

[0024] Figure 7 yes Figure 5 A schematic diagram of the structure shown when the mold frame is removed;

[0025] Figure 8 This is a schematic diagram showing the separation of one of the sliding modules and the lower module;

[0026] Figure 9 This is a 3D structural diagram of the lower module;

[0027] Figure 10 It is a 3D structural diagram of the modular lower module;

[0028] Figure 11 yes Figure 5 Partial sectional front view of the structure shown;

[0029] Figure 12 yes Figure 11 Top view of the structure shown when rotated 90 degrees in the opposite direction;

[0030] Figure 13 This is the main view of the sliding module.

[0031] Component labeling: Upper template 1, Upper mounting base 2, Lower template 3, Lower mounting base 4, Mold frame 5, Frame body 501, Sliding pressure template 502, Positioning step surface 50201, Extension section 50202, Sliding hole 503, Pressure-resistant spring 504, Guide rod 505, Sliding module 6, Lower module 7, Mold ridge 701, Groove 702, Middle module 703, Side module 704, Blind hole 705, Drive mechanism 8, Pressure arm 9, Suction cup 10, Middle convex ridge a1, Side wing a2. Detailed Implementation

[0032] The embodiments of the present invention will be fully described below. Some core features of the embodiments will be specifically illustrated in the accompanying drawings, wherein the same or similar reference numerals in the drawings represent the same or similar technical features, or structures, steps, or processes with similar functions. Other embodiments derived by those skilled in the art based on these embodiments without requiring creative effort are also within the protection scope of the present invention.

[0033] Please see Figures 3-4 The mold shown is for forming a lower crossbeam of a front wall panel, mainly comprising an upper mold plate 1 and a lower mold plate 3. Each mold plate is equipped with a mounting base, which is a rectangular block structure with several cavities and reinforcing ribs inside to reduce weight and increase strength. For details, please refer to [reference needed]. Figures 5-7In this embodiment, a lower module 7 is fixed on the lower mounting seat 4 of the lower template 3, while an upper module is provided on the upper mounting seat 2 of the upper template 1. The upper template 1 moves downward with the upper mounting seat 2 on which the upper module is mounted, and abuts against the lower mounting seat 4 to achieve the cooperation between the upper module and the lower module 7, thus stamping out the lower crossbeam of the front wall panel. In addition, there is a recessed groove 702 in the center of the top of the lower module 7, and a raised die ridge 701 in the center of the bottom of the groove 702. The top surface of the lower module 7 is used for the sheet material to be stamped into the lower crossbeam of the front wall panel, which is placed flat at the groove end of the groove 702, waiting for the upper module to press down and form it. Specifically, in the manufacturing process, the upper module of this embodiment is as follows: Figures 5-6 As shown, it mainly includes a mold frame 5 and a pair of sliding modules 6. The mold frame 5 is a frame-shaped structure. On one side of the mold frame 5, there is a sliding hole 503 for the first sliding module 6 to be vertically slidably installed. On the other side, there is a notch for the second sliding module 6 to be vertically slidably installed. In specific operation, the upper module moves towards the lower module 7 through a driving mechanism 8. The driving mechanism 8 causes the mold frame 5 to be vertically pressed down onto the sheet metal that is laid flat on the top surface of the lower module 7 before the two sliding modules 6. That is, the mold frame 5 first presses and fixes the sheet metal that is laid flat on the top of the lower mold for subsequent stamping. During stamping, the middle section of the sheet metal is pressed down first to the position where it is pressed into contact with the mold ridge 701. The side sections on the front and rear sides of the sheet metal are then pressed by the two sliding modules 6 onto the bottom of the grooves 702 on the front and rear sides of the mold ridge 701. The sheet metal is stamped and formed in stages to form the lower crossbeam of the front wall panel. The part formed by the mold ridge 701 is the raised central convex ridge a1 of the middle section of the lower crossbeam of the front wall panel.

[0034] More specifically, such as Figures 5-6 As shown, the mold frame 5 in this embodiment includes a Π-shaped frame body 501 and a sliding pressure template 502 vertically slidably installed inside the frame body 501. That is, the mold frame 5 is a modular design; its internal components can elastically slide relative to each other when subjected to corresponding external forces. Specifically, during manufacturing, the sliding pressure template 502 and the frame body 501 are elastically connected by a vertically arranged pressure-resistant spring 504, allowing the mold frame 5 to move downwards as a whole, while also allowing the internal components to move asynchronously when necessary. During manufacturing, the sliding pressure template 502 separates the sliding hole 503 and the notch, so that they maintain relative sliding contact with their respective sliding modules 6.

[0035] As a more detailed design structure, in this embodiment, when the driving mechanism 8 drives the mold frame 5 to move downward, the frame body 501 and the sliding pressing template 502 simultaneously reach the position of contact with the sheet metal at the top of the groove 702, preparing for stamping. During driving, the driving force can be applied to the top surface of the sliding pressing template 502. By driving the entire mold frame 5 downward through the sliding pressing template 502, the frame body 501 can clamp and fix the sheet metal when pressing the two ends of the sheet metal, while the sliding pressing template 502 continues to move downward, thereby bending the middle section of the sheet metal downward. It should be noted that during this process, the two sliding modules 6 always maintain relative sliding contact with the sliding pressing template 502. When the sliding pressing template 502 moves downward, the sliding template also moves downward. The two move at different speeds, so that the sliding pressing template 502 always moves downward relative to the two sliding modules 6 until the lower crossbeam of the front wall panel is formed. The purpose of this design is to first use the mold frame 5 to press and fix the sheet metal on the top surface of the lower mold in place at the beginning of the stamping process, so as to prevent the sheet metal from deviating during subsequent stamping. Then, the sliding pressure plate 502 continues to move down, while the frame body 501 cannot move down further, pressing the sheet metal part corresponding to the central convex ridge a1 of the lower crossbeam of the front wall panel downward. At this time, the front and rear sides of the sheet metal will begin to warp upward. If it is not restrained, it will lead to difficulties in subsequent forming. However, if it moves down synchronously with the sliding pressure plate 502, stress concentration will occur due to the concentrated force on the entire sheet metal, resulting in local wrinkles or cracks. Therefore, in this embodiment, when the sliding pressure plate 502 moves down, the sliding module 6 will also move down, but will maintain a slightly smaller displacement difference with the sliding pressure plate 502. On the one hand, this is to ensure that the side wings a2 on both sides of the lower crossbeam of the front wall panel are finally formed after the central convex ridge a1 is formed. That is, the central convex ridge a1 is located between the two side wings a2 and protrudes upward. To better achieve the above-mentioned technical effects, it is recommended that the vertical displacement of the sliding pressure plate 502 relative to the two sliding modules 6 in this embodiment should not exceed the thickness of the sheet material.

[0036] In practice, the drive mechanism 8 can be implemented in various ways. For example, it can employ a series of hydraulic cylinders, including at least one first hydraulic cylinder, a second hydraulic cylinder, and a third hydraulic cylinder. The first hydraulic cylinder is connected to the top of the sliding pressure plate 502, causing the sliding pressure plate 502, or mold frame 5, to move downwards. The second hydraulic cylinder is connected to the top of the first sliding module 6, causing the first sliding module 6 to move downwards. The third hydraulic cylinder is connected to the top of the second sliding module 6, causing the second and first sliding modules 6 to move downwards synchronously. The extension speed of the piston rod of the first hydraulic cylinder should be slightly faster than that of the second and third hydraulic cylinders. This ensures that after the frame body 501, the sliding pressure plate 502, and the two sliding molds all contact the sheet metal simultaneously, the sliding pressure plate 502 and the sliding module 6 can sequentially form the corresponding central convex ridge a1 and side wing a2, respectively. The hydraulic cylinders can also be pneumatic cylinders or other similar drive components.

[0037] Specifically, in the above implementation structure, such as Figure 6 Each of the two opposite sides of the sliding pressure template 502 has a positioning step surface 50201, and the sliding module 6 has a protrusion on the side opposite to the sliding pressure template 502 to form a positioning boss on the side of the sliding module 6. When the sliding block moves to the point where its positioning boss fits with the positioning step surface 50201, the lower crossbeam of the front wall panel is formed, avoiding excessive compression of the side wing a2.

[0038] In this embodiment, as Figure 13 The sliding module 6 is provided with several suction holes for connecting to a negative pressure device (not shown in the figure). The bottom of the suction hole is provided with a suction cup 10 that adsorbs and contacts the front and rear sides of the lower crossbeam of the front wall panel. During the process of the sliding module 6 pressing the lower crossbeam of the front wall panel, the suction cup 10 presses and contacts the sheet material or the surface of the formed lower crossbeam of the front wall panel, and then adsorbs and connects, so that when the upper module moves up and back after the stamping is completed, the formed lower crossbeam of the front wall panel can be taken out from the groove 702.

[0039] Regarding the connection structure between the sliding pressure template 502 and the frame body 501 in the above embodiments, as follows: Figure 11 As shown, this illustrates the main structural positions of the upper and lower modules 7 when the front wall panel lower crossbeam is stamped and formed, i.e., when the upper and lower modules 7 are properly aligned (the front wall panel lower crossbeam is omitted in the figure to focus on the module alignment structure). In practice, an extension section 50202 is required on the top side of the sliding pressure template 502. This extension section 50202 is vertically slidably installed in a groove on the inner wall of the frame body 501. The bottom of this groove is connected to the extension section 50202 via a pressure-resistant spring 504, thus achieving a vertical elastic connection. During installation, a guide rod 505 is coaxially installed within the pressure-resistant spring 504. The top end of the guide rod 505 is fixed to the extension section 50202, and the bottom end slides through the bottom of the frame body 501. This ensures that when the sliding pressure template 502 is lifted and the pressure-resistant spring 504 is stretched, the suspended frame body 501 and the sliding pressure template 502 maintain a vertical sliding connection, preventing misalignment and separation.

[0040] Based on the above embodiments, such as Figure 11As shown, the top surface of the lower module 7 has a guide blind hole 705. The opening at the top of the guide blind hole 705 is preferably designed in the shape of a flared mouth, so that the bottom end of the guide rod 505 can slide into the guide blind hole 705 during stamping. At the beginning of stamping, the pressure spring 504 allows the upper module to be freely positioned above the top of the lower die in the initial state, that is, the frame body 501 is in a suspended position. At this time, the bottom of the sliding pressure plate 502 is flush with the top surface of the frame body 501 so that it can contact the sheet metal at the beginning of stamping. Moreover, the bottom end of the guide rod 505 never leaves the bottom of the groove, that is, the guide rod 505 never leaves the frame body 501, ensuring that the frame body 501 and the sliding pressure plate 502 are always vertically and slidingly connected together.

[0041] Finally, for ease of installation and manufacturing, the lower module 7 includes a middle module and side modules on both sides. The middle module and side modules are surrounded by several L-shaped pressure arms 9, and horizontally arranged pressure plates press down on the lower template 3, thereby realizing the modular assembly and installation of the lower module 7, which facilitates maintenance and replacement of locally damaged parts of the lower module 7.

[0042] The above series of specific implementation details are merely some preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the claims of the present invention. Those skilled in the art, based on their understanding of the above embodiments and referring to the basic principles recorded in the claims of the present invention, can easily modify the design ideas, but these modifications still fall within the scope of protection of the invention.

Claims

1. A forming mold for a lower crossbeam of a front wall panel, comprising an upper template (1) and a lower template (3), each template having a mounting seat, a lower module (7) fixed on a lower mounting seat (4) on the lower template (3), and an upper module provided on an upper mounting seat (2) of the upper template (1), characterized in that, The lower module (7) has a recessed groove (702) at the top center, and a raised mold ridge (701) at the bottom center of the groove (702). The top surface of the lower module (7) is used for the sheet material to be placed flat at the groove end of the groove (702). The upper module includes a mold frame (5) and a pair of sliding modules (6). One side of the mold frame (5) has a sliding hole (503) for the first sliding module (6) to be vertically slidably installed, and the other side has a notch for the second sliding module (6) to be vertically slidably installed. The upper module moves closer to the lower module (7) via a drive mechanism (8). The drive mechanism (8) causes the mold frame (5) to be pressed vertically down onto the plate material laid flat on the top surface of the lower module (7) before the two sliding modules (6), so that the middle section of the plate material is pressed down first to the position of extrusion contact with the mold ridge (701). The side sections on the front and rear sides of the plate material are then extruded by the two sliding modules (6) onto the bottom of the grooves (702) on the front and rear sides of the mold ridge (701) to form the lower crossbeam of the front wall panel.

2. The front wall panel lower crossbeam forming mold according to claim 1, characterized in that, The mold frame (5) includes a frame body (501) in the shape of a ∏ and a sliding pressure template (502) that is vertically slidably installed in the frame body (501). The sliding pressure template (502) and the frame body (501) are also elastically connected by a vertically arranged pressure-resistant spring (504). The sliding pressure template (502) separates the sliding hole (503) and the notch. When the driving mechanism (8) drives the mold frame (5) to move down, the frame body (501) and the sliding pressing template (502) simultaneously reach the position of contact with the plate material at the top of the groove (702), and apply the driving force to the top surface of the sliding pressing template (502), so that when the frame body (501) presses the two ends of the plate material, the sliding pressing template (502) continues to move down and bends the middle section of the plate material downward. During this process, the two sliding modules (6) always maintain relative sliding contact with the sliding pressing template (502), and the sliding pressing template (502) always moves downward relative to the two sliding modules (6) until the lower crossbeam of the front wall panel is formed.

3. The front wall panel lower crossbeam forming mold according to claim 2, characterized in that, The vertical displacement of the sliding pressure plate (502) relative to the two sliding modules (6) is not greater than the thickness of the sheet material.

4. The front wall panel lower crossbeam forming mold according to claim 2, characterized in that, The drive mechanism (8) includes at least one first hydraulic cylinder, a second hydraulic cylinder, and a third hydraulic cylinder, wherein the first hydraulic cylinder is connected to the top of the sliding pressure plate (502), the second hydraulic cylinder is connected to the top of the first sliding module (6), and the third hydraulic cylinder is connected to the top of the second sliding module (6). The piston rod of the first hydraulic cylinder extends faster than the piston rods of the second and third hydraulic cylinders.

5. The front wall panel lower crossbeam forming mold according to claim 2, characterized in that, The sliding pressure template (502) has a positioning step surface (50201) on each of its two opposite sides. The sliding module (6) has a protrusion on the side opposite to the sliding pressure template (502) to form a positioning boss on the side of the sliding module (6). When the sliding block moves to the point where its positioning boss fits into the positioning step surface (50201), the lower crossbeam of the front wall panel is formed.

6. The forming mold for the lower crossbeam of the front wall panel according to claim 2, characterized in that, The sliding module (6) is provided with several suction holes, which are used to connect with the negative pressure device. The bottom end of the suction hole is provided with a suction cup (10) that adsorbs and contacts the front and rear sides of the lower crossbeam of the front wall panel. During the process of the sliding module (6) squeezing the lower crossbeam of the front wall panel, the suction cup (10) adsorbs and connects with the lower crossbeam of the front wall panel so that the formed lower crossbeam of the front wall panel can be taken out during demolding.

7. The front wall panel lower crossbeam forming mold according to claim 2, characterized in that, The sliding pressure plate (502) has an extension section (50202) on the top side. The extension section (50202) is vertically slidably installed in a groove on the inner wall of the frame body (501). The bottom of the groove is connected to the extension section (50202) by a pressure-resistant spring (504).

8. The front wall panel lower crossbeam forming mold according to claim 7, characterized in that, The pressure-resistant spring (504) also has a guide rod (505) coaxially arranged inside it. The top end of the guide rod (505) is fixed on the extension section (50202), and the bottom end slides through the bottom of the frame body (501).

9. A front wall panel lower crossbeam forming mold according to claim 8, characterized in that, The top surface of the lower module (7) has a guide blind hole (705). The bottom end of the guide rod (505) slides into the guide blind hole (705). The pressure-resistant spring (504) ensures that when the upper module is freely positioned above the top of the lower mold in the initial state, the bottom of the sliding pressure plate (502) is flush with the top surface of the frame body (501), and the bottom end of the guide rod (505) never leaves the bottom of the groove.

10. A front wall panel lower crossbeam forming mold according to claim 2, characterized in that, The lower module (7) includes a middle module and side modules located on both sides thereon. The middle module and side modules are surrounded by several L-shaped pressure arms (9), and a horizontally arranged pressure plate is pressed downward on the lower template (3) to achieve combined installation.

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