A fiberboard edge grinding treatment device and process

Abstract

The present invention relates to a fiberboard edge grinding treatment device and process, including a support bench, a guide frame, a pressing component and an edge grinding component. The support bench is of a rectangular structure. In the middle of the upper end of the support bench, there is a rectangular groove, and a guide frame is installed in the rectangular groove. In the middle of the upper end of the support bench, a pressing component is installed, and on the left side of the upper end of the support bench, an edge grinding component is installed. The present invention can solve the following problems existing in the edge grinding treatment of existing fiberboards: manual edge grinding of the board is likely to result in unevenly ground edges, and when grinding different end faces, it is necessary to manually rotate the board. In addition, when grinding the board, it is necessary to manually use tools to position the board, and when rotating the board, it is necessary to remove the tools, and the operation is cumbersome and complex.

Description

Technical Field

[0001] The present invention relates to the technical field of fiberboard processing, and specifically relates to a fiberboard edge grinding device and process. Background Art

[0002] Fiberboard is a kind of artificial board made by mechanically separating and chemically treating wood or plant fibers, adding adhesives, waterproof agents, etc., and then forming under high temperature and high pressure. It is an ideal artificial board for making furniture. The structure of medium-density fiberboard is more uniform than natural wood, and it also avoids problems such as decay and insect damage. At the same time, it has small expansion and contraction and is easy to process. Fiberboard has the advantages of uniform material, small difference in longitudinal and transverse strength, and not easy to crack, and is widely used.

[0003] Currently, the following problems exist in the edge grinding process of existing fiberboards. Manually grinding the edges of the boards easily leads to unevenly ground edges. Moreover, when grinding the edges of different end faces, it is necessary to manually rotate the board. In addition, when grinding the edges of the board, it is necessary to manually use tools to position the board, and the tools need to be removed when rotating the board, and the operation is cumbersome and complex. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a fiberboard edge grinding device.

[0005] The present invention adopts the following technical solutions to achieve: A fiberboard edge grinding device includes a support platform frame, a guiding frame, a pressing component, and an edge grinding component. The support platform frame has a rectangular structure. In the middle of the upper end of the support platform frame, there is a rectangular groove, and a guiding frame is installed in the rectangular groove. In the middle of the upper end of the support platform frame, a pressing component is installed, and an edge grinding component is installed on the left side of the upper end of the support platform frame.

[0006] The edge grinding component includes an L-shaped frame, a mounting frame, an adjustment unit, a reinforcing plate, and an edge grinding unit. The L-shaped frame is installed on the left side of the support platform frame, and the mounting frame is fixedly installed at the upper end of the L-shaped frame. There is a groove on the right side of the mounting frame, and the adjustment unit is installed in the groove. Reinforcing plates are evenly installed between the left side of the mounting frame and the L-shaped frame. The right end of the adjustment unit is installed with an edge grinding unit. The adjustment unit realizes the function of accurately grinding the fiberboard by driving the edge grinding unit to move inward.

[0007] The edge grinding unit includes a U-shaped frame, an adjustment rod, a threaded seat, and an edge grinding frame. The U-shaped frame is installed on the right side of the adjustment unit. The adjustment rod is installed on the U-shaped frame through a bearing. External threads are symmetrically arranged on the adjustment rod, and the two external threads have opposite opening directions. Each external thread is connected with a threaded seat by means of thread fit. A sliding frame is installed on the outside of the threaded seat. Edge grinding frames are symmetrically arranged inside the U-shaped frame. The outside of the edge grinding frame is connected to the U-shaped frame through a pin shaft. A limiting groove is arranged on the inner side of the edge grinding frame. The sliding frame is connected to the limiting groove by means of sliding fit.

[0008] As a preferred technical solution of the present invention, the guide frame includes a connecting plate, a rotating seat and a guide wheel. The connecting plates are uniformly installed inside the rectangular groove. The rotating seats are uniformly installed on the connecting plates. The guide wheels are installed on the rotating seats, and the guide wheels are made of hard rubber.

[0009] As a preferred technical solution of the present invention, the pressing assembly includes a moving unit, a rotating motor, a rotating plate, a driving cylinder and a pressing plate. The moving unit is fixedly installed at the upper end of the support platform frame. The rotating motor is installed on the moving unit through a motor seat. A rotating plate is installed on the output shaft of the rotating motor. The driving cylinders are symmetrically installed on the rotating plate. The top end of the driving cylinder is connected to the pressing plate through a flange. A rubber pad is arranged on the lower end surface of the pressing plate, and the rubber pad can play a role in buffering to ensure the pressing effect of the fiberboard.

[0010] As a preferred technical solution of the present invention, the moving unit includes a fixed frame, an electric slide rail, a moving plate and a moving frame. The fixed frame is installed on the support platform frame, and the number of fixed frames is two. The electric slide rail is installed inside the fixed frame. The moving plate is installed at the upper end of the electric slide rail. The moving frame is installed between the moving plates, and the cross section of the moving frame is in a U-shaped structure.

[0011] As a preferred technical solution of the present invention, the adjusting unit includes an electric slider, a guide rail, a connecting block and a cross plate. The electric slider is installed in the middle of the groove. The cross plate is installed outside the electric slider. The guide rails are symmetrically installed in the groove. The connecting block is connected to the guide rail in a sliding fit manner. The outside of the connecting block is fixedly connected to the cross plate. The grinding unit is installed outside the cross plate.

[0012] As a preferred technical solution of the present invention, a rectangular groove is formed in the grinding frame. A resisting plate is obliquely arranged in the rectangular groove. Rotating shafts are installed in the rectangular groove at both ends in the length direction of the resisting plate through bearings. A grinding belt is arranged between the two rotating shafts. The grinding belt abuts against the resisting plate. The grinding frame 454 is installed with a grinding motor through a motor seat. The output shaft of the grinding motor is connected to one of the rotating shafts. When the grinding frame gradually moves, the grinding belt can gradually perform edge grinding on the fiberboard from shallow to deep.

[0013] Spray holes are also uniformly arranged on the grinding frame, and the spray holes are connected to a high-pressure air pump.

[0014] In addition, the present invention also provides an installation method for a fiberboard edge grinding treatment device. The processing technology of the fiberboard edge grinding treatment device specifically includes the following steps:

[0015] S1. Preparation operation: According to the thickness of the fiberboard to be processed, control the adjusting rod to rotate. During the rotation of the adjusting rod, the edging frame is adjusted to a proper working state through the sliding frame.

[0016] S2. Fiberboard transportation: Place the fiberboard to be processed on the upper end of the guiding frame. The guiding frame plays a role in supporting and assisting the fiberboard to move with a changed direction during this process. The driving cylinder on the pressing assembly drives the pressing plate to press the fiberboard. After controlling the fiberboard to be adjusted to a proper working angle, it drives the fiberboard to move towards the edging unit to the working position.

[0017] S3. Edging processing: The adjusting unit can drive the edging unit to perform horizontal displacement, so that the edging frame gradually performs edging processing on the fiberboard from shallow to deep.

[0018] S4. Rotation adjustment: After the edging of one end face of the fiberboard is completed, drive the fiberboard to perform position adjustment through the pressing assembly, and rotate the board 90° to adjust the unprocessed end face of the fiberboard to the working state. Repeat the above steps S2 and S3 to complete the edging processing operation of the four end faces of the fiberboard.

[0019] S5. Stacking and collection: Remove the processed board from the guiding frame, and centrally stack the removed fiberboards.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The present invention solves the following problems existing in the existing fiberboard during the edging process. Manually edging the board easily causes uneven edges during grinding, and when edging different end faces, it is necessary to manually rotate the board. In addition, when edging the board, it is necessary to manually use tools to position the board, and when rotating the board, it is necessary to remove the tools, and the operation is cumbersome and complex.

[0022] 2. The edging assembly designed in the present invention can be adjusted to an adaptable state according to the specifications of the board during operation, and can perform edging processing on various boards with different specifications. There is no need for manual edging of the board, which reduces the labor intensity of the staff. In addition, the edging frame can perform edging processing on the edges of the board from shallow to deep, which can reduce the impact force during edging processing of the board, can accurately control the edging thickness, and can reduce the error during corner grinding.

[0023] 3. The cooperation between the pressing assembly and the guiding frame designed in the present invention can not only fix the position of the board, but also automatically complete the rotation adjustment of the board when it is necessary to adjust the edging end face of the board. There is no need for manual use of fixtures to fix the board, and the operation is simple and convenient.

[0024] 4. A fiberboard edge grinding device provided by the present invention is also evenly provided with spray holes on the edge grinding frame. The spray holes are connected to a high-pressure air pump. When the high-pressure air pump works, the gas can clean the ground raw materials to prevent impurity accumulation and ensure the edge grinding effect of the board. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the drawings and embodiments.

[0026] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 is a first cross-sectional structural schematic diagram of the present invention;

[0028] Figure 3 is a first cross-sectional structural schematic diagram of the present invention;

[0029] Figure 4 is a cross-sectional structural schematic diagram of the edge grinding assembly of the present invention;

[0030] Figure 5 is a cross-sectional structural schematic diagram of the edge grinding unit of the present invention

[0031] Figure 6 is a structural schematic diagram of the edge grinding frame of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] As Figures 1 to 6 shown, a fiberboard edge grinding device includes a support platform frame 1, a guide frame 2, a pressing assembly 3 and an edge grinding assembly 4. The support platform frame 1 has a rectangular structure. A rectangular groove is provided in the middle of the upper end of the support platform frame 1. A guide frame 2 is installed in the rectangular groove. A pressing assembly 3 is installed in the middle of the upper end of the support platform frame 1. An edge grinding assembly 4 is installed on the left side of the upper end of the support platform frame 1.

[0034] In specific work with the above technical solution, first place the plate to be processed on the guide frame 2 and adjust the position of the plate so that the plate is parallel to the edge grinding assembly 4. Then, press the plate through the pressing assembly 3, and drive the plate to move to the position in contact with the edge grinding assembly 4 through the mutual cooperation between the pressing assembly 3 and the guide frame 2, so that the edge grinding assembly 4 can perform edge grinding on the plate during operation. After the operation is completed, the pressing assembly 3 and the guide frame 2 cooperate with each other to control the rotation and adjustment of the plate, and then repeat to control the other side of the plate to contact the edge grinding assembly 4, thereby completing the edge grinding operation of the plate.

[0035] The guide frame 2 includes a connecting plate 21, a rotating seat 22 and a guide wheel 23. The connecting plates 21 are uniformly installed inside the rectangular groove. The rotating seats 22 are uniformly installed on the connecting plates 21. The guide wheels 23 are installed on the rotating seats 22. The guide wheels 23 are made of hard rubber, and the rotating seats 22 can rotate 360° in the horizontal direction.

[0036] The pressing assembly 3 includes a moving unit 31, a rotating motor, a rotating plate, a driving cylinder 32 and a pressing plate 33. The moving unit 31 is fixedly installed at the upper end of the support platform frame 1. The rotating motor is installed on the moving unit 31 through a motor seat. The output shaft of the rotating motor is installed with the rotating plate. The driving cylinders 32 are symmetrically installed on the rotating plate. The top end of the driving cylinder 32 is connected with the pressing plate 33 through a flange. A rubber pad is arranged on the lower end surface of the pressing plate 33. The rubber pad can play a role in buffering to ensure the pressing effect of the fiberboard. In addition, the rubber pad can increase the friction force between the plate.

[0037] In specific work with the above technical solution, after the plate is placed on the guide wheel 23, start the driving cylinder 32 to drive the pressing plate 33 to move downward from top to bottom. During the downward movement of the pressing plate 33, the rubber pad is driven to abut against the upper end surface of the plate. After being squeezed, the rubber pad closely adheres to the plate, which not only protects the plate, but also increases the friction force between the rubber pad and the plate. At this time, according to the relative position between the plate and the edge grinding assembly 4, start the rotating motor to drive the rotating plate to adjust, thereby driving the pressing plate 33 to perform operations synchronously. During the operation, the pressing plate 33 drives the plate to adjust the position through the mutual cooperation between the rubber pad and the rotating seat 22, so that the position of the plate to be edge ground is parallel to the execution position of the edge grinding unit 4, which can ensure the smooth progress of the plate edge grinding operation and the stability of the plate during the edge grinding operation.

[0038] Such as Figure 3As shown in the figure, the mobile unit 31 includes a fixed frame 311, an electric slide rail 312, a moving plate 313 and a moving frame 314. The fixed frame 311 is installed on the support platform 1. The number of fixed frames 311 is two. An electric slide rail 312 is installed inside the fixed frame 311. A moving plate 313 is installed at the upper end of the electric slide rail 312. A moving frame 314 is installed between the moving plates 313. The cross-section of the moving frame 314 is in a U-shaped structure.

[0039] In the specific working process with the above technical solution, the electric slide rail 312 drives the moving frame 314 to perform accurate displacement, so that the moving frame 314 can drive the pressing plate 33 to move. The driving cylinder 32 drives the pressing plate 33 to press the fiberboard, preventing the fiberboard from shaking.

[0040] As Figure 4 shown in the figure, the edge grinding assembly 4 includes an L-shaped frame 41, a mounting frame 42, an adjusting unit 43, a reinforcing plate 44 and an edge grinding unit 45. The L-shaped frame 41 is installed on the left side of the support platform 1. The mounting frame 42 is fixedly installed at the upper end of the L-shaped frame 41. A groove is provided on the right side surface of the mounting frame 42, and the adjusting unit 43 is installed in the groove. Reinforcing plates 44 are evenly installed between the left side surface of the mounting frame 42 and the L-shaped frame 41. The edge grinding unit 45 is installed at the right end of the adjusting unit 43. The adjusting unit 43 drives the edge grinding unit 45 to move inward to achieve the function of accurately grinding the fiberboard.

[0041] In the specific working process with the above technical solution, the adjusting unit 43 can drive the edge grinding unit 45 to reciprocate, so that the edge grinding unit 45 can accurately grind the fiberboard. The edge grinding unit 45 is designed with an adjustable inclination angle, and thus the edge grinding angle of the fiberboard can be adjusted.

[0042] As Figure 5 shown in the figure, the edge grinding unit 45 includes a U-shaped frame 451, an adjusting rod 452, a threaded seat 453 and an edge grinding frame 454. The U-shaped frame 451 is installed on the right side of the adjusting unit 43. The adjusting rod 452 is installed on the U-shaped frame 451 through a bearing. External threads are symmetrically provided on the adjusting rod 452, and the opening directions of the two sections of external threads are opposite. Each section of external thread is connected with a threaded seat 453 by means of thread fit. A sliding frame is installed on the outside of the threaded seat 453. Edge grinding frames 454 are symmetrically provided inside the U-shaped frame 451. The outer side of the edge grinding frame 454 is connected to the U-shaped frame 451 through a pin shaft. A limiting groove is provided on the inner side surface of the edge grinding frame 454. The sliding frame is connected to the limiting groove by means of sliding fit.

[0043] In the specific working process of adopting the above technical solution, when the adjusting rod 452 is manually rotated, the external thread on the adjusting rod 452 can drive the threaded seat 453 to move in the same or opposite direction. The threaded seat 453 can adjust the inclination angle of the edge grinding frame 454 through the sliding frame, so that the edge grinding frame 454 can accurately process the fiberboard. In addition, when edge grinding and processing plates of different specifications, by controlling the rotation of the adjusting rod 452, the gap between the two edge grinding frames 454 can be synchronously controlled, and plates of various specifications can be processed.

[0044] The adjusting unit 43 described above includes an electric slider 431, a guide rail 432, a connecting block 433, and a cross plate 434. The electric slider 431 is installed in the middle of the groove. The cross plate 434 is installed outside the electric slider 431. The guide rails 432 are symmetrically installed in the groove. The connecting block 433 is connected to the guide rails 432 in a sliding fit manner. The outside of the connecting block 433 is fixedly connected to the cross plate 434. The edge grinding unit 45 is installed outside the cross plate 434. During operation, the electric slider 431 drives the edge grinding unit 45 to reciprocate through the cross plate 434. The guide rail 432 can play a role in limiting the position to ensure the accuracy of the movement of the edge grinding unit 45.

[0045] As Figure 6 shown, a rectangular groove is formed in the edge grinding frame 454. A resisting plate is inclined in the rectangular groove. Rotating shafts are installed in the rectangular groove at both ends in the length direction of the resisting plate through bearings. A grinding belt is arranged between the two rotating shafts. The grinding belt abuts against the resisting plate. The edge grinding frame 454 is installed with an edge grinding motor through a motor base. The output shaft of the edge grinding motor is connected to one of the rotating shafts. When the edge grinding frame 454 gradually moves, the grinding belt can gradually perform edge grinding processing on the fiberboard from shallow to deep.

[0046] After the plate to be edge ground is placed, the electric slider and the edge grinding motor are started synchronously. While the electric slider 431 controls the cross plate 434 to perform a translation operation, it simultaneously drives the edge grinding frame 454 to move towards the plate. The edge grinding motor drives the grinding belt to rotate in a cycle through the rotating shaft. During the process of the inclined resisting plate moving along with the cross plate 434, the depth of contact with the plate gradually increases, so as to perform edge grinding processing on the plate from shallow to deep through the grinding belt.

[0047] Spray holes are also evenly arranged on the edge grinding frame 454. The spray holes are connected to a high-pressure air pump. When the high-pressure air pump works, the gas can clean the ground raw materials to prevent impurity accumulation and ensure the edge grinding effect of the plate.

[0048] In addition, the present invention also provides a processing technology for a fiberboard edge grinding treatment device. The processing technology of the fiberboard edge grinding treatment device specifically includes the following steps:

[0049] S1. Preparation operation: According to the thickness of the fiberboard to be processed, control the rotation of the adjusting rod 452. During the rotation of the adjusting rod 452, the edging frame (454) is adjusted to a proper working state through the sliding frame.

[0050] S2. Fiberboard conveying: Place the fiberboard to be processed on the upper end of the guiding frame 2. During this process, the guiding frame 2 plays a role in supporting and assisting the fiberboard to move with a changed direction. The driving cylinder 32 on the pressing assembly 3 drives the pressing plate 33 to press the fiberboard. After controlling the fiberboard to be adjusted to a proper working angle, drive the fiberboard to move towards the edging unit 45 to the working position.

[0051] S3. Edging processing: The adjusting unit 43 can drive the edging unit 45 to perform a horizontal displacement, so that the edging frame 454 gradually performs edging processing on the fiberboard from shallow to deep.

[0052] S4. Rotation adjustment: After the edging of one end face of the fiberboard is completed, drive the fiberboard to perform a position adjustment through the pressing assembly 3, and rotate the board 90° to adjust the unprocessed end face of the fiberboard to the working state. Repeat the above steps S2 and S3 to complete the edging processing operation of the four end faces of the fiberboard.

[0053] S5. Stacking and collecting: Remove the processed board from the guiding frame 2, and centrally stack the removed fiberboards.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The descriptions in the above embodiments and the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A fiberboard edge grinding device, comprising a support bench (1), a guide frame (2), a pressing assembly (3) and an edge grinding assembly (4), characterized in that, The described support stand (1) has a rectangular structure. In the middle of the upper end of the support stand (1), there is a rectangular groove, and a guide frame (2) is installed in the rectangular groove. In the middle of the upper end of the support stand (1), a pressing component (3) is installed. On the left side of the upper end of the support stand (1), an edge grinding component (4) is installed, where: The described pressing component (3) includes a moving unit (31), a driving cylinder (32), and a pressing plate (33). The moving unit (31) is fixedly installed on the upper end of the support stand (1). Driving cylinders (32) are symmetrically installed on the moving unit (31). The top end of the driving cylinder (32) is connected to the pressing plate (33) through a flange. A rubber pad is provided on the lower end surface of the pressing plate (33); The described edge grinding component (4) includes an L-shaped frame (41), a mounting frame (42), an adjusting unit (43), a reinforcing plate (44), and an edge grinding unit (45). The L-shaped frame (41) is installed on the left side of the support stand (1). The mounting frame (42) is fixedly installed at the upper end of the L-shaped frame (41). A groove is provided on the right side surface of the mounting frame (42), and the adjusting unit (43) is installed in the groove. Reinforcing plates (44) are evenly installed between the left side surface of the mounting frame (42) and the L-shaped frame (41). The right end of the adjusting unit (43) is installed with the edge grinding unit (45); The described edge grinding unit (45) includes a U-shaped frame (451), an adjusting rod (452), a threaded seat (453), and an edge grinding frame (454). The U-shaped frame (451) is installed on the right side of the adjusting unit (43). The adjusting rod (452) is installed on the U-shaped frame (451) through a bearing. External threads are symmetrically provided on the adjusting rod (452), and the two sections of external threads have opposite opening directions. Each section of external thread is connected to a threaded seat (453) through a threaded fit. A sliding frame is installed on the outside of the threaded seat (453). Edge grinding frames (454) are symmetrically provided inside the U-shaped frame (451). The outside of the edge grinding frame (454) is connected to the U-shaped frame (451) through a pin shaft. A limiting groove is provided on the inner side surface of the edge grinding frame (454). The sliding frame is connected to the limiting groove through a sliding fit.

2. The fiberboard edge grinding treatment device according to claim 1, characterized in that: The described guide frame (2) includes a connecting plate (21), a rotating seat (22), and a guide wheel (23). The connecting plates (21) are evenly installed inside the rectangular groove. The rotating seats (22) are evenly installed on the connecting plates (21). The guide wheels (23) are installed on the rotating seats (22). The guide wheels (23) are made of hard rubber.

3. A fiberboard edge grinding treatment device according to claim 1, characterized in that: The described moving unit (31) includes a fixed frame (311), an electric slide rail (312), a moving plate (313), and a moving frame (314). The fixed frame (311) is installed on the support stand (1). The number of fixed frames (311) is two. The electric slide rail (312) is installed inside the fixed frame (311). The moving plate (313) is installed at the upper end of the electric slide rail (312). The moving frame (314) is installed between the moving plates (313). The cross-section of the moving frame (314) has a U-shaped structure.

4. A fiberboard edge grinding treatment device according to claim 1, characterized in that: The described adjusting unit (43) includes an electric slider (431), a guide rail (432), a connecting block (433) and a cross plate (434). The electric slider (431) is installed in the middle of the groove. The cross plate (434) is installed on the outside of the electric slider (431). The guide rails (432) are symmetrically installed in the groove. The connecting block (433) is connected to the guide rail (432) in a sliding fit manner. The outside of the connecting block (433) is fixedly connected to the cross plate (434). The edge grinding unit (45) is installed on the outside of the cross plate (434).

5. A fiberboard edge grinding treatment device according to claim 1, characterized in that: The edge grinding frame (454) is of a rectangular structure. Rectangular grooves are evenly arranged on the edge grinding frame (454). Grinding rollers are evenly installed in the rectangular grooves through pin shafts. The extending distance of the grinding rollers relative to the inner side surface of the edge grinding frame (454) gradually increases.

6. The fiberboard edge grinding treatment device according to claim 1, characterized in that: Spray holes are also evenly arranged on the edge grinding frame 454. The spray holes are connected to a high-pressure air pump.

7. A processing technology of a fiberboard edge grinding treatment device, comprising a fiberboard edge grinding treatment device as described in any one of claims 1-6, characterized in that, The processing technology includes the following steps: S1. Fiber board conveying: Place the fiber board to be processed on the upper end of the guiding frame (2). The guiding frame (2) drives the fiber board for conveying and adjustment. S2. Pressing and fixing: The pressing component (3) can press and fix the surface of the fiber board to prevent the fiber board from shaking. S3. Edge grinding processing: The adjusting unit (43) can drive the edge grinding unit (45) for reciprocating adjustment, so that the edge grinding frame (454) can accurately grind the surface of the fiber board. The adjusting rod (452) can drive the edge grinding frame (454) for angle adjustment to accurately grind each edge of the fiber board. S4. Board collecting: Collect and stack the fiber boards ground in step S3.

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