Material pressing device for wood-plastic floor production and using method of material pressing device

By using a gear transmission system to adjust the position of the rubber pad and the spring-pushing extrusion strips in the presser for wood-plastic floor production, the adaptation problem of sheets of different sizes is solved, and production efficiency and product quality are improved.

CN119238983AInactive Publication Date: 2025-01-03ANHUI AIYALUN NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202411474084.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-22
Publication Date
2025-01-03
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing pressing device for wood-plastic flooring production cannot adapt to different sizes of boards during the pressing process, resulting in the offset of the boards and affecting the production effect.

Method used

The four rubber pad positions are adjusted through the transmission system of four second gears, and the extrusion strips are continuously pressed against both sides of the board to achieve adaptation to different sizes of boards.

Benefits of technology

It improves the adaptation efficiency and production efficiency of the equipment, ensuring that the extruded strips always stick to the board during the pressing process, and adapt to wood-plastic floors of different thicknesses and sizes.

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Abstract

The invention discloses a material pressing device for wood-plastic floor production and a using method of the material pressing device, and belongs to the technical field of wood-plastic floor production. The material pressing device for wood-plastic floor production comprises a base, an upper pressing frame is arranged at the upper end of the base, and four second gears are longitudinally arranged in the middle of the upper pressing frame in a stacked mode. The wood-plastic floor press-fit device solves the problems that in the press-fit process of an existing wood-plastic floor press-fit device, the position of a connecting rod is fixed, the wood-plastic floor press-fit device cannot adapt to plates of different sizes, when the plates are adsorbed and pressed, due to the fact that the connecting rod is not matched, the plates are extruded to deviate, and the production effect of wood-plastic floors is affected. Four rubber pads can be driven at the same time through transmission of four second gears for position adjustment, the adaptation efficiency is improved, in the pressing process, extrusion strips can be continuously attached to the two sides of a plate through pushing of springs, and the wood-plastic floor production device is suitable for production of wood-plastic floors of different sizes.
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Description

Technical Field

[0001] The invention relates to the technical field of wood plastic floor production, in particular to a material press for wood plastic floor production and a use method thereof. Background Art

[0002] The press for WPC flooring production is a device specially used in the production process of WPC flooring. Its main function is to press the WPC composite material. The device presses the WPC composite material under high temperature and high pressure by adjusting parameters such as temperature, pressure and time, so as to obtain WPC flooring products with specific shapes and properties. The press for WPC flooring production plays a vital role in the production process of WPC flooring, and is of great significance for improving production efficiency and ensuring product quality.

[0003] A Chinese patent with announcement number CN220995772U discloses a pressing device for processing wood plastic flooring, including a second fixing plate, two sets of clamping components are arranged on the upper surface of the second fixing plate, the wood plastic flooring is placed in the two sets of clamping components at the upper end of the second fixing plate, the clamping components can fix the position of the wood plastic flooring to prevent movement during pressing, and then the pressing components are started to press the wood plastic flooring, so as to achieve the effect of facilitating the positioning and pressing of the wood plastic flooring.

[0004] During the pressing process of the wood plastic floor pressing device of the above patent, the position of the connecting rod is fixed and cannot adapt to boards of different sizes. When the boards are adsorbed and pressed, the boards are squeezed and deviated due to the incompatibility, which affects the production effect of the wood plastic floor. Summary of the invention

[0005] The object of the present invention is to provide a press for producing wood plastic flooring and a method for using the same. The four second gears can simultaneously drive the four rubber pads to adjust their positions, thereby improving the efficiency of adaptation. In addition, during the pressing process, the extrusion strip can continuously fit the two sides of the board through the push of the spring, thereby adapting to the production of wood plastic flooring of different sizes and solving the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a press for producing wood plastic flooring, comprising a base, an upper pressing frame is arranged at the upper end of the base, four second gears are longitudinally stacked at the middle position of the upper pressing frame, four third transmission bars whose horizontal positions are not uniform and do not contact each other are arranged around one side of the outside of the second gear, the third transmission bar is meshed and connected with the outside of the second gear through the tooth groove of the outer wall, the lower end of the third transmission bar is connected to a rubber pad through a connecting piece, and the positions of the four rubber pads are adjusted simultaneously by the four second gears, and the adjustment can improve the adaptation efficiency of the wood plastic flooring.

[0007] Preferably, the rubber pad is located at the four corners of the upper pressing frame, and a roller is provided on the side of the rubber pad facing the inside of the upper pressing frame. The upper pressing frame is laterally recessed toward the roller and a second sliding rail is provided. During the pressing process, the roller can support the rubber pad in contact with the plate to prevent the third transmission bar from bending.

[0008] Preferably, a support bar welded and fixed to the upper pressing frame is provided at one end of the outside of the third transmission bar, and the outside of the support bar is inserted into the inside of the third transmission bar and is slidably connected to the inside of the third transmission bar. When the third transmission bar slides laterally and adjusts the position of the rubber pad, the third transmission bar will slide on the outside of the support bar. The support of the third transmission bar by the support bar can improve the stability of the rubber pad position adjustment and the stability of the meshing connection between the third transmission bar and the second gear.

[0009] Preferably, a first transmission bar is fixed on both sides of the upper pressing frame by bolts, and a first gear is provided on one side outside the first transmission bar. The outside of the first gear is meshed and connected with the tooth groove outside the first transmission bar, and can rotate as the upper pressing frame moves downward longitudinally. The rotation of the first gear can push the second transmission bar to move laterally to clamp both sides of the plate.

[0010] Preferably, the front and rear ends of the outer lower end of the first gear are both provided with a second transmission bar in meshing connection, and the lower ends of the two second transmission bars are both provided with a first sliding rail, the second transmission bar is inserted into the interior of the first sliding rail and is slidingly connected with the interior of the first sliding rail, and during the lateral sliding of the second transmission bar, the second transmission bar will slide in the first sliding rail, and the lateral sliding second transmission bar can be supported by the first sliding rail.

[0011] Preferably, a movable rail is provided in the internal recess of the second transmission bar, and a movable rod is provided on the outside of the movable rail toward the middle of the base. The two movable rods are welded and fixed at one end toward the middle of the base by an extrusion strip, and the movable rod can slide in the movable rail to adapt to plates of different sizes.

[0012] Preferably, the movable rail is internally provided with a spring whose two ends are respectively welded and fixed to the movable rod and the second transmission bar. The resilience of the spring can make the extrusion bar continuously fit the two sides of the plate when the upper pressing frame is continuously pressed.

[0013] Preferably, a through hole is provided between the two first sliding rails, and the reserved through hole can facilitate the adjustment of the longitudinal position of the first transmission bar, so as to prevent the base from colliding with the first transmission bar when the first transmission bar adjusts its horizontal position longitudinally.

[0014] A method for using a press for producing wood plastic flooring comprises the following steps:

[0015] Step 1: Place the wood plastic flooring board to be pressed in the middle of the upper end of the base and pull one of the rubber pads;

[0016] Step 2: When the rubber pad is pulled, it will drive the corresponding third transmission bar to slide, and the third transmission bar will drive the second gear to rotate;

[0017] Step 3: The rotation of the second gear will pull the remaining three rubber pads to adjust their positions synchronously;

[0018] Step 4: Start the hydraulic expansion device at the middle position of the upper end of the upper pressing frame. When the rubber pad moves toward the plate, it will simultaneously drive the first transmission bars on both sides to move longitudinally;

[0019] Step 5: The first transmission bar drives the first gear to rotate, and the rotation of the first gear drives the second transmission bar at the lower end to move toward the plate placed on the upper end of the base;

[0020] Step 6: The spring drives the movable rod and the extrusion bar at one end to contact the plate together. As the upper pressing frame continues to move vertically downward, the extrusion bar will be close to the plate;

[0021] Step 7. The hydraulic expansion device continues to push to complete the wood plastic floor. The first transmission bar will repeat the transmission in step 6 to drive the extrusion bar to move, but the contraction of the spring makes the extrusion bar only continue to fit the two sides of the board. The increase in the pressure of the hydraulic expansion device and the increase in the spring resilience can increase the fitting strength of the extrusion bar.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. When adjusting the four rubber pads inside the pressing frame of the present invention and facing the base, when one of the rubber pads is moved, the moved rubber pad will drive the corresponding third transmission bar to fit the second gear for lateral movement, and fitting the second gear will cause the second gear to rotate, but the rotation of the second gear will drive the remaining three third transmission bars at different horizontal positions to move lateral, and the four third transmission bars will drive the corresponding rubber pads to adjust their positions during the simultaneous movement, and the four rubber pads correspond to the four corners of the pressed material, and the rubber pads are adjusted synchronously to avoid independent adjustment of the positions of the four rubber pads, thereby improving the efficiency of the equipment when in use and the efficiency of size adjustment.

[0024] 2. The present invention provides extrusion bars on both sides of the extruded board on both sides of the upper pressing frame. When the upper pressing frame moves longitudinally and presses the board, the upper pressing frame will be synchronously driven by the first transmission bar to rotate the first gear. The rotation of the first gear will push the second transmission bar and the extrusion bar at one end to fit the two sides of the board. With the continuous pressing of the upper pressing frame and the thickness of the board, after the extrusion bar contacts the material, the contraction of the spring can make the upper pressing frame continue to move longitudinally, and the extrusion bar can still keep fitting the two sides of the board, so as to adapt to wood-plastic floors of different thicknesses and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a stereoscopic diagram of the overall external structure of the present invention;

[0026] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A area;

[0027] Figure 3 It is a cross-sectional view of the internal structure of the movable rail of the present invention;

[0028] Figure 4 It is a schematic diagram of the position relationship of the rubber pad of the present invention;

[0029] Figure 5 A cross-sectional view of the internal structure of the upper pressing frame of the present invention;

[0030] Figure 6 It is an exploded view of the internal structure of the third transmission bar of the present invention.

[0031] In the figure: 1. base; 2. upper pressing frame; 3. first transmission bar; 4. second transmission bar; 5. first gear; 6. first sliding rail; 7. through hole; 8. extrusion bar; 9. movable rail; 10. spring; 11. connecting piece; 12. rubber pad; 13. third transmission bar; 14. second gear; 15. support bar; 16. second sliding rail; 17. roller; 18. movable rod. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific embodiments.

[0033] Example 1

[0034] like Figure 1 As shown, a press for producing wood plastic flooring in this embodiment includes a base 1, and the material to be pressed of the wood plastic flooring is pre-placed on the upper end of the base 1, and the material to be pressed of the wood plastic flooring needs to be pre-placed near the middle of the upper end of the base 1 to facilitate the subsequent adaptation of the adjusted rubber pad 12;

[0035] In order to improve the pressing effect of the wood plastic floor materials to be pressed, Figure 1 and Figure 4 As shown, an upper pressing frame 2 is provided at the upper end of the base 1, and four rubber pads 12 are provided on the side of the lower end of the upper pressing frame 2 facing the base 1, and the four rubber pads 12 are respectively located at the four corners of the lower end of the upper pressing frame 2. The upper pressing frames 2 at the four corners can be adjusted to adapt to sheets of different sizes to be pressed:

[0036] Among them, a second gear 14 is arranged in the middle of the upper pressing frame 2, and four second gears 14 are arranged in a longitudinally stacked manner, and the four second gears 14 respectively correspond to the transmission of the rubber pads 12 at the four corners. Figure 5 and Figure 6 As shown, a third transmission bar 13 is provided on one side of the outside of the second gear 14, and the four third transmission bars 13 contact the four second gears 14 respectively. The horizontal positions of the four third transmission bars 13 are not uniform, and the four third transmission bars 13 do not contact each other. The third transmission bar 13 is meshed and connected with the outside of the second gear 14 through the tooth grooves on the outer wall. Pulling one of the third transmission bars 13 will drive the second gear 14 to rotate, and after the second gear 14 rotates, the second gear 14 will drive the remaining third transmission bars 13 to perform the same lateral movement, so that the positions of the four third transmission bars 13 are adjusted uniformly;

[0037] In addition, a connecting piece 11 is provided at the lower end of the third transmission bar 13, and a rubber pad 12 is provided at one side of the lower end of the connecting piece 11. Figure 4 and Figure 5 As shown, the rubber pads 12 are located at the four corners of the upper pressing frame 2. During the pressing process, the rubber pads 12 are in contact with the plate to complete the pressing. The rubber pads 12, the connecting piece 11 and the third transmission bar 13 are fixedly connected in sequence. The position of the rubber pads 12 can be adjusted synchronously by adjusting the third transmission bar 13, and the adjustment of the rubber pads 12 can adapt to the sizes of different plates.

[0038] In order to improve the effect of subsequent material pressing, the third transmission bar 13 is prevented from being bent due to pressure. Figure 6 A roller 17 is provided on one side of the rubber pad 12 facing the inner side of the upper pressing frame 2, and a second sliding rail 16 is provided in a transverse depression at a position of the upper pressing frame 2 facing the roller 17. The rubber pad 12 drives the roller 17 to roll in the second sliding rail 16 during the transverse movement. When the rubber pad 12 contacts the sheet to complete the pressing, the roller 17 can provide the most direct support on one side of the rubber pad 12, thereby reducing the pressure that the third transmission bar 13 needs to bear.

[0039] In order to improve the stability of the third transmission bar 13 when it slides horizontally, a support bar 15 is provided at one end of the outside of the third transmission bar 13, and one end of the support bar 15 is welded and fixed to the inner wall of the upper pressing frame 2, and the outside of the support bar 15 is inserted into the inside of the third transmission bar 13 and is slidably connected to the inside of the third transmission bar 13. When the second gear 14 transmits and adjusts the lateral position of the third transmission bar 13, the support bar 15 provides auxiliary support to the third transmission bar 13;

[0040] like Figure 1 and Figure 3 As shown, first transmission bars 3 are fixedly provided on both sides of the upper pressing frame 2 by bolts, a first gear 5 is provided on one side of the outside of the first transmission bar 3, the outside of the first gear 5 is meshed and connected with the tooth groove outside the first transmission bar 3, the first transmission bar 3 will move longitudinally together with the base 1, and the longitudinal movement of the first transmission bar 3 will drive the first gear 5 to rotate;

[0041] Among them, the front and rear ends of the lower end of the first gear 5 are both provided with second transmission bars 4, the lower ends of the two second transmission bars 4 are both provided with first sliding rails 6, and the upper ends of the second transmission bars 4 are meshed and connected with the outer part of the first gear 5, such as Figure 1 and Figure 2 As shown, the first sliding rail 6 is embedded in the interior of the base 1, the second transmission bar 4 is inserted into the interior of the first sliding rail 6 and is slidably connected with the interior of the first sliding rail 6, and the longitudinal movement of the first transmission bar 3 is driven by the first gear 5 to drive the second transmission bar 4 to move horizontally, so that the second transmission bar 4 moves toward the plate placed on the upper end of the base 1;

[0042] In addition, a movable rail 9 is provided in the inner recess of the second transmission bar 4, and a movable rod 18 is provided on the outer side of the movable rail 9 toward the middle of the base 1. One end of the two movable rods 18 facing the middle of the base 1 is welded and fixed by the extrusion bar 8. A spring 10 is provided inside the movable rail 9, and the two ends of the spring 10 are respectively welded and fixed to the second transmission bar 4 and the movable rod 18. When the extrusion bar 8 does not contact the plate, the connection of the spring 10 can drive the movable rod 18 and the extrusion bar 8 at one end to contact the plate. After the extrusion bar 8 contacts the plate, when the second transmission bar 4 continues to push, the spring 10 will be compressed by pressure. When it contracts, the resilience of the spring 10 will increase the extrusion force of the extrusion bar 8, thereby improving the stability of the material when pressing the material.

[0043] A through hole 7 is provided between the two first sliding rails 6 , and the through hole 7 penetrates and extends to the upper and lower ends of the base 1 , and the longitudinal downward movement of the first transmission bar 3 can pass through the through hole 7 , preventing the base 1 from affecting the installation and transmission of the through hole 7 .

[0044] A method for using a press for producing wood plastic flooring comprises the following steps:

[0045] Step 1: Place the wood plastic flooring board to be pressed at the middle position of the upper end of the base 1, and pull and adjust one of the rubber pads 12;

[0046] Step 2: When the rubber pad 12 is pulled, it will drive the corresponding third transmission bar 13 to slide, and the third transmission bar 13 will slide outside the support bar 15. The lateral movement of the third transmission bar 13 will drive the second gear 14 to rotate through the external fixed tooth groove;

[0047] Step 3: The rotation of the second gear 14 will contact the remaining three third transmission bars 13 with tooth grooves. After pulling and moving one rubber pad 12, the positions of the remaining three rubber pads 12 can be adjusted synchronously. The four rubber pads 12 correspond to the four corners of the plate. The rubber pads 12 are adjusted to adapt to plates of different sizes.

[0048] Step 4: After adjusting the rubber pad 12 in contact with the plate, start the hydraulic expansion device at the middle position of the upper end of the upper pressing frame 2. When the hydraulic expansion device pushes the adjusted rubber pad 12 toward the plate, it will simultaneously drive the first transmission bars 3 on both sides to move longitudinally. The longitudinal movement of the first transmission bar 3 can penetrate and embed into the through hole 7.

[0049] Step 5: The first transmission bar 3 moves longitudinally downward to drive the first gear 5 on one side to rotate. The rotation of the first gear 5 can drive the second transmission bar 4 at the lower end to move toward the plate placed on the upper end of the base 1 through meshing connection;

[0050] Step 6: During the horizontal movement of the second transmission bar 4, the spring 10 drives the movable rod 18 and the extrusion bar 8 at one end to contact the plate together. As the upper pressing frame 2 continues to move vertically downward, the extrusion bar 8 will be close to the plate;

[0051] Step 7. As the hydraulic expansion device continues to push and the pressing of the wood plastic floor is completed, the first transmission bar 3 will also continue to move longitudinally downward. The first transmission bar 3 will repeat the transmission in step 6 to drive the extrusion bar 8 to move, but the contraction of the spring 10 makes the extrusion bar 8 only continue to fit the two sides of the board, and as the pressing force of the hydraulic expansion device increases, the increase in the resilience of the spring 10 can increase the fitting force of the extrusion bar 8.

[0052] Working principle: the material to be pressed is spread flat on the upper end of the base 1, and after being spread flat, the position of the rubber pad 12 is adjusted according to the area of ​​the spread material, and the position of one of the rubber pads 12 is directly pulled. After being pulled, the rubber pad 12 will drive the third transmission bar 13 to move, and the movement of the third transmission bar 13 will drive the second gear 14 to rotate through the tooth groove, and the rotation of the second gear 14 will drive the remaining three third transmission bars 13 to move horizontally, and the remaining three third transmission bars 13 will drive the corresponding rubber pads 12 to adjust their positions, so that the three rubber pads 12 are adjusted to the same position, so that the three rubber pads 12 and the manually pulled rubber pad 1 2 positions are kept uniform, the upper end of the upper pressing frame 2 is pushed by the hydraulic telescopic rod, so that the adjusted rubber pad 12 fits the material and presses it, and in the process of longitudinal pressing, the upper pressing frame 2 will drive the first transmission bar 3 to move longitudinally synchronously, the first transmission bar 3 will drive the first gear 5 to rotate through the tooth groove, and the first gear 5 will drive the extrusion bar 8 to move toward the middle of the base 1 through the second transmission bar 4, and the lateral movement of the extrusion bar 8 will squeeze the two sides of the pressed material to avoid tilting and offset of the material after being longitudinally squeezed, and as the degree of longitudinal pressing of the upper pressing frame 2 is tightened, the extrusion bar 8 squeezes the two sides of the material more tightly.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A press for producing wood plastic flooring, comprising a base (1), characterized in that: An upper pressing frame (2) is arranged at the upper end of the base (1), four second gears (14) are longitudinally stacked at the middle position of the upper pressing frame (2), four third transmission bars (13) whose horizontal positions are not uniform and do not contact each other are arranged around one side of the outside of the second gear (14), the third transmission bar (13) is meshed and connected with the outside of the second gear (14) through the tooth grooves on the outer wall, and the lower end of the third transmission bar (13) is connected to the rubber pad (12) through the connecting piece (11).

2. A press for producing wood plastic flooring according to claim 1, characterized in that: The rubber pad (12) is located at the four corners of the upper pressing frame (2); a roller (17) is provided on one side of the rubber pad (12) facing the interior of the upper pressing frame (2); and a second sliding rail (16) is provided in a transverse recessed position of the upper pressing frame (2) facing the roller (17).

3. A press for producing wood plastic flooring according to claim 1, characterized in that: A support bar (15) is provided at one end of the outside of the third transmission bar (13) and is welded and fixed to the upper pressing frame (2); the outside of the support bar (15) is inserted into the inside of the third transmission bar (13) and is slidably connected to the inside of the third transmission bar (13).

4. A press for producing wood plastic flooring according to claim 1, characterized in that: A first transmission bar (3) is fixedly provided on both sides of the upper pressing frame (2) by means of bolts, a first gear (5) is provided on one side outside the first transmission bar (3), and the outside of the first gear (5) is meshedly connected with the tooth groove outside the first transmission bar (3).

5. A press for producing wood plastic flooring according to claim 4, characterized in that: The front and rear ends of the lower end of the first gear (5) are both provided with meshingly connected second transmission bars (4), the lower ends of the two second transmission bars (4) are both provided with first sliding rails (6), and the second transmission bars (4) are inserted into the interior of the first sliding rail (6) and are slidably connected with the interior of the first sliding rail (6).

6. A press for producing wood plastic flooring according to claim 5, characterized in that: A movable rail (9) is provided in the inner recess of the second transmission bar (4), and a movable rod (18) is provided on the outside of the movable rail (9) facing the middle of the base (1), and one end of the two movable rods (18) facing the middle of the base (1) is welded and fixed by an extrusion bar (8).

7. A press for producing wood plastic flooring according to claim 6, characterized in that: The movable rail (9) is provided with a spring (10) at both ends of which are respectively welded and fixed to the movable rod (18) and the second transmission bar (4).

8. A press for producing wood plastic flooring according to claim 5, characterized in that: A through hole (7) is provided between the two first sliding rails (6).

9. A method for using a press for producing wood plastic flooring, based on the press for producing wood plastic flooring according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: Place the wood plastic flooring board to be pressed at the middle position of the upper end of the base (1), and pull one of the rubber pads (12); Step 2: After the rubber pad (12) is pulled, it drives the correspondingly connected third transmission bar (13) to slide, and the third transmission bar (13) drives the second gear (14) to rotate; Step 3: The rotation of the second gear (14) pulls the remaining three rubber pads (12) to adjust their positions synchronously; Step 4: Start the hydraulic expansion and contraction device at the middle position of the upper end of the upper pressing frame (2), and when the rubber pad (12) moves toward the plate, it simultaneously drives the first transmission bars (3) on both sides to move longitudinally; Step 5: The first transmission bar (3) drives the first gear (5) to rotate, and the rotation of the first gear (5) drives the second transmission bar (4) at the lower end to move toward the plate placed on the upper end of the base (1); Step 6: The spring (10) drives the movable rod (18) and the squeezing strip (8) at one end to contact the plate together, and as the upper pressing frame (2) continues to move longitudinally downward, the squeezing strip (8) is closely attached to the plate; Step 7: The hydraulic expansion device continuously pushes the wood plastic floor, the first transmission bar (3) repeats the transmission in step 6 to drive the extrusion bar (8) to move, the contraction of the spring (10) makes the extrusion bar (8) only continuously fit the two sides of the board, the pressure of the hydraulic expansion device increases, and the resilience of the spring (10) increases, so that the fitting force of the extrusion bar (8) is increased.