Bamboo board recombination double-layer hot pressing device

By designing a double-layer hot-pressing device for reconstituted bamboo boards, and using a cleaning brush and ventilation mechanism to remove debris from the board surface, the problem of dust and debris affecting the board structure during the hot-pressing process is solved, ensuring the quality of the finished product.

CN223877165UActive Publication Date: 2026-02-06ANJI ZHUDI NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202520003154.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-02
Publication Date
2026-02-06
Estimated Expiration
2035-01-02

AI Technical Summary

Technical Problem

Existing hot pressing equipment can easily cause dust, debris, and organic impurities to adhere to the sheet material during hot pressing, affecting the pressing effect, resulting in unstable sheet material structure and impacting the quality of the finished product.

Method used

A double-layer hot-pressing device for reconstituted bamboo boards was designed, comprising an upper hot-pressing fixture, a lower hot-pressing fixture, a cleaning brush, and a ventilation mechanism. When the boards are fed in via a conveyor belt, the cleaning brush cleans the surface of the boards, while the blower and suction fan work together to remove debris. After hot pressing, the boards are cooled and pushed.

Benefits of technology

Effectively clean dust, debris, and organic impurities from the surface of the board, ensuring timely removal of impurities during hot pressing to avoid affecting the structural stability of the board and improve the quality of the finished product.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223877165U_ABST
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Abstract

The utility model provides a bamboo board recombination double-layer hot pressing device, and belongs to the technical field of bamboo board recombination processing. Comprising a hot-pressing support, a first through groove is formed in the middle of the hot-pressing support, an upper hot-pressing tool and a lower hot-pressing tool are fixedly connected to the top and the bottom of the first through groove respectively, a first hot-pressing plate is fixedly connected to the bottom of the upper hot-pressing tool, and a third hot-pressing plate is fixedly connected to the top of the lower hot-pressing tool. By arranging the fixing frame and the cleaning brush cylinder, dust, chippings and other organic impurities on the surface of a plate are cleaned up in time before hot pressing, waste possibly generated in the hot pressing process can be cleaned up when the plate leaves after hot pressing, the phenomenon that the structure of the hot-pressed plate is unstable, and the hot-pressed plate cannot be damaged is avoided. And a ventilation mechanism is arranged, so that the hot-pressed plates can be cooled and pushed while the plates are cleaned, and the hot-pressed plates are prevented from adhering to the tops of the second hot-pressing plate and the third hot-pressing plate.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bamboo board reorganization processing, especially to a bamboo board reorganization double -layer hot pressing device. BACKGROUND

[0002] The board hot pressing is a kind of technology for processing and manufacturing various boards, usually utilizes the dual action of heating and pressure, makes material under high temperature and high pressure to press, to realize the purpose of strengthening, combination or forming, can handle two boards simultaneously through double -layer design, increases production efficiency, simultaneously ensures the uniformity and high quality of board, is often applied to the production of wood, plastic, composite material and metal plate etc., especially suitable for mass production and improves production efficiency.

[0003] The existing hot pressing device is easy to be contaminated with dust, debris and other organic impurities on the board when hot pressing, which affects the pressing effect, resulting in the structure of the hot-pressed board being unstable, ultimately affecting the quality of the finished board product, therefore, the present application provides a bamboo board reorganization double -layer hot pressing device to meet the needs. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem to provide a kind of bamboo board reorganization double -layer hot pressing device to solve the existing hot pressing device when hot pressing, board is easy to be contaminated with dust, debris and other organic impurities, which affects the pressing effect, resulting in the structure of the hot-pressed board being unstable, ultimately affecting the quality of the finished board product problem.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] The utility model provides a kind of bamboo board reorganization double-layer hot pressing device, including hot pressing support, the middle of the hot pressing support is provided with through slot one, the top and bottom of the through slot one are respectively fixedly connected with upper hot pressing tool and lower hot pressing tool, the bottom of the upper hot pressing tool is fixedly connected with hot pressing plate one, the top of the lower hot pressing tool is fixedly connected with hot pressing plate three, the both sides of the hot pressing plate one are fixedly connected with connecting column, the outer surface of the connecting column is fixedly connected with fixed ring, hot pressing plate two is arranged between the hot pressing plate one and the hot pressing plate three, the top of the fixed ring is in contact with the bottom of the hot pressing plate two, the end of the connecting column away from the hot pressing plate one penetrates the hot pressing plate three, the both sides of the hot pressing support are fixedly connected with two fixed frames, two sliding grooves are formed in the fixed frame, the cleaning brush cylinder is slidably connected between the fixed frames through the sliding groove, the both ends of the cleaning brush cylinder are fixedly connected with limit disc, air passage mechanism is installed on the side of the cleaning brush cylinder, and the air passage mechanism includes fixed strip that is sleeved on the cleaning brush cylinder, the side of the fixed strip is fixedly connected with fixed block that slides in the inside of the sliding groove, and the end of the fixed strip away from the fixed block is fixedly connected with air pipe that penetrates the fixed strip.

[0007] Preferably, one side of the hot pressing support is provided with a conveying mechanism, the conveying mechanism includes a conveying support, an upper conveying belt and a lower conveying belt are placed on the conveying support, and the upper conveying belt and the lower conveying belt are arranged in an upper-lower manner.

[0008] Preferably, two sides of the fixed frame are provided with through slot two below the lower sliding groove, a material frame is fixedly connected between the fixed frames, and the two sides of the material frame are communicated with the through slot two.

[0009] Preferably, the both sides of the hot pressing support are fixedly connected with air blowers that can blow dust, debris and other organic impurities to one side, one end of the air pipe is communicated with the air outlet of the air blower.

[0010] Preferably, the both sides of the hot pressing support are fixedly connected with air suction machines that can absorb dust, debris and other organic impurities on the opposite side of the air blower.

[0011] Preferably, air passages are formed in the hot pressing plate two and the hot pressing plate three, one end of the air passage is formed in one side of the hot pressing plate two and the hot pressing plate three and located directly below the air pipe, and the other end of the air passage is located at the top of the hot pressing plate two and the hot pressing plate three.

[0012] Compared with the prior art, the utility model has at least the following beneficial effects:

[0013] In the above scheme, by setting the upper and lower hot pressing tools, when the hot pressing operation is performed, the upper and lower conveying belts on the conveying support send the plate to the top of the hot pressing plate two and the hot pressing plate three, then the upper hot pressing tool drives the hot pressing plate one to move downward, the hot pressing plate one drives the connecting column to move downward, the connecting column penetrates through the hot pressing plate three while driving the fixing ring to move downward, the fixing ring drives the hot pressing plate two to move downward together, when the hot pressing plate two and the plate on the top of the hot pressing plate three interfere, the hot pressing plate two stops moving, until the hot pressing plate one and the plate on the top of the hot pressing plate two interfere, the hot pressing operation can be performed.

[0014] By setting the fixing frame and the cleaning brush cylinder, when the upper and lower conveying belts send the plate to the top of the hot pressing plate two and the hot pressing plate three, the plate first contacts the cleaning brush cylinder, under the action of the upper and lower conveying belts, the plate lifts the cleaning brush cylinder, so that the cleaning brush cylinder slides upward in the sliding groove, after the cleaning brush cylinder lifts the plate, it continues to move to the top of the hot pressing plate two and the hot pressing plate three, during the movement, the cleaning brush cylinder sweeps the dust, debris and other organic impurities on the surface of the plate, sweeps the impurities off the plate, the impurities fall into the inside of the material frame through the second through groove under the action of the air blower, and then are blown into the air suction machine. After the plate is hot pressed, the air blower and the air suction machine on the other side of the hot pressing support continue to cooperate to clean the waste generated during the hot pressing process, which has the advantages that the dust, debris and other organic impurities on the surface of the plate are cleaned in time before hot pressing, and the waste generated during the hot pressing process can be cleaned when the plate leaves after hot pressing, so that the structure of the hot pressed plate is stable, and the quality of the finished plate is finally affected.

[0015] By setting the ventilation mechanism, when the plate is hot pressed, the new plate is sent to the top of the hot pressing plate two and the hot pressing plate three, the cleaning brush cylinder is lifted by the plate, the fixing strip is lifted upward, the fixing block slides upward in the sliding groove while limiting the fixing strip to avoid tilting, and the ventilation pipe is lifted upward by the fixing strip. Finally, one end of the ventilation pipe communicates with the ventilation groove on the hot pressing plate two and the hot pressing plate three, the air blown by the air blower is blown out from the other end of the ventilation groove on the top of the hot pressing plate two and the hot pressing plate three after passing through the ventilation pipe, so as to cool and blow the plate on the hot pressing plate two and the hot pressing plate three after hot pressing. The new plate pushes the hot pressed plate to leave the top of the hot pressing plate two and the hot pressing plate three, which has the advantages that the plate is cleaned and cooled and pushed at the same time, and the hot pressed plate is prevented from sticking to the top of the hot pressing plate two and the hot pressing plate three. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable a person skilled in the relevant art to make and use the present disclosure.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the double-layer hot-pressing device for bamboo board recombination;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the double-layer hot-pressing device for bamboo board recombination after removing the air blower and the air suction machine;

[0019] Figure 3 It is a schematic diagram of the front cross-sectional structure of the double-layer hot-pressing device for bamboo board recombination;

[0020] Figure 4 It is Figure 2 It is a schematic diagram of the enlarged structure at A in the middle;

[0021] Figure 5 It is a schematic diagram of the enlarged structure of the fixed frame, the ventilation mechanism and the cleaning brush cylinder after assembly;

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the ventilation mechanism.

[0023] [Reference signs]

[0024] 1, hot-pressing support; 2, upper hot-pressing tool; 3, hot-pressing plate one; 4, hot-pressing plate two; 5, hot-pressing plate three; 6, lower hot-pressing tool; 7, fixed frame; 8, sliding groove; 9, ventilation mechanism; 901, fixed strip; 902, fixed block; 903, ventilation pipe; 10, through groove one; 11, conveying support; 12, upper conveying belt; 13, lower conveying belt; 14, cleaning brush cylinder; 15, material frame; 16, limiting disc; 17, through groove two; 18, air blower; 19, air suction machine; 20, ventilation groove; 21, connecting column.

[0025] As shown in the drawings, in order to clearly realize the structure of the embodiments of the present application, specific structures and devices are marked in the drawings, but this is only for the purpose of illustration and is not intended to limit the present application to this specific structure, device and environment. According to specific needs, those skilled in the art can adjust or modify these devices and environments, and the adjustments or modifications still include in the scope of the appended claims. DETAILED DESCRIPTION

[0026] The bamboo board reorganization double-layer hot pressing device provided by the utility model will be described in detail in combination with the drawings and specific embodiments. Meanwhile, it is pointed out here that, in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and other alternative ways can also be adopted by the skilled in the art to implement some known technologies; and the drawings are only used to describe the embodiments in more detail, and are not intended to specifically limit the utility model.

[0027] As Figures 1-6 shown, the embodiment of the utility model provides a kind of bamboo board reorganization double-layer hot pressing device, including hot pressing support 1, the middle of hot pressing support 1 is provided with through slot one 10, the top and bottom of through slot one 10 are respectively fixedly connected with upper hot pressing tool 2 and lower hot pressing tool 6, the bottom of upper hot pressing tool 2 is fixedly connected with hot pressing plate one 3, the top of lower hot pressing tool 6 is fixedly connected with hot pressing plate three 5, the both sides of hot pressing plate one 3 are all fixedly connected with connecting column 21, the outer surface of connecting column 21 is fixedly connected with fixed ring, hot pressing plate two 4 is arranged between hot pressing plate one 3 and hot pressing plate three 5, the top of fixed ring and the bottom of hot pressing plate two 4 are in contact, the end of connecting column 21 away from hot pressing plate one 3 penetrates hot pressing plate three 5, the both sides of hot pressing support 1 are all fixedly connected with two fixed frames 7, two sliding grooves 8 are formed in fixed frame 7, cleaning brush cylinder 14 is slidably connected between fixed frame 7 through sliding groove 8, the both ends of cleaning brush cylinder 14 are all fixedly connected with limit disc 16, air passage mechanism 9 is installed on one side of cleaning brush cylinder 14, air passage mechanism 9 includes fixed strip 901 that is sleeved on cleaning brush cylinder 14, one side of fixed strip 901 is fixedly connected with fixed block 902 that slides in the inside of sliding groove 8, one end of fixed strip 901 away from fixed block 902 is fixedly connected with air pipe 903 that penetrates fixed strip 901, conveying mechanism is arranged on one side of hot pressing support 1, conveying mechanism includes conveying support 11, conveying belt 12 and lower conveying belt 13 are placed on conveying support 11, conveying belt 12 and lower conveying belt 13 are arranged in an up-down mode, two sides of fixed frame 7 are provided with through slot two 17 below the lower sliding groove 8, material frame 15 is fixedly connected between fixed frame 7, the both sides of material frame 15 are communicated with through slot two 17, the both sides of hot pressing support 1 are all fixedly connected with hair dryer 18, which can blow dust, chippings and other organic impurities to one side, one end of air pipe 903 is communicated with the air outlet of hair dryer 18, the both sides of hot pressing support 1 are all fixedly connected with air suction machine 19 on the opposite side of hair dryer 18, which can absorb dust, chippings and other organic impurities, air passage groove 20 is formed in hot pressing plate two 4 and hot pressing plate three 5, one end of air passage groove 20 is formed on one side of hot pressing plate two 4 and hot pressing plate three 5 and is located directly below air pipe 903, the other end of air passage groove 20 is located on the top of hot pressing plate two 4 and hot pressing plate three 5.

[0028] By setting the upper hot pressing tool 2 and the lower hot pressing tool 6, when the hot pressing operation is performed, the upper conveying belt 12 and the lower conveying belt 13 on the conveying support 11 will send the plate to the top of the hot pressing plate two 4 and the hot pressing plate three 5, then the upper hot pressing tool 2 drives the hot pressing plate one 3 to move downward, the hot pressing plate one 3 will drive the connecting column 21 to move downward, the connecting column 21 will penetrate through the hot pressing plate three 5 while driving the fixing ring to move downward, the fixing ring will drive the hot pressing plate two 4 to move downward together, when the hot pressing plate two 4 and the plate on the top of the hot pressing plate three 5 are in contact, the hot pressing plate two 4 stops moving, until the hot pressing plate one 3 and the plate on the top of the hot pressing plate two 4 are in contact, the hot pressing operation can be performed.

[0029] By setting the fixing frame 7 and the cleaning brush cylinder 14, when the upper conveying belt 12 and the lower conveying belt 13 send the plate to the top of the hot pressing plate two 4 and the hot pressing plate three 5, the plate will first contact the cleaning brush cylinder 14, under the action of the upper conveying belt 12 and the lower conveying belt 13, the plate will lift the cleaning brush cylinder 14, so that the cleaning brush cylinder 14 slides upward in the inside of the sliding groove 8, after the cleaning brush cylinder 14 lifts the plate, it will continue to move to the top of the hot pressing plate two 4 and the hot pressing plate three 5, during the movement, the cleaning brush cylinder 14 will sweep the dust, debris and other organic impurities on the surface of the plate, and the impurities will be swept off the plate, and will fall into the inside of the material frame 15, and then will be blown into the air blower 19 through the through slot two 17 under the action of the air blower 18, after the plate is hot pressed and leaves the top of the hot pressing plate two 4 and the hot pressing plate three 5, the air blower 18 and the air blower 19 on the other side of the hot pressing support 1 will continue to cooperate to clean the waste generated during the hot pressing process, which has the advantages that the dust, debris and other organic impurities on the surface of the plate can be cleaned in time before hot pressing, and the waste generated during the hot pressing process can be cleaned when the plate leaves after hot pressing, so as to avoid that the structure of the hot pressed plate is not stable and finally affects the quality of the finished plate.

[0030] When the plate is hot-pressed, the new plate is sent to the top of the hot-pressing plate two 4 and the hot-pressing plate three 5, and the cleaning brush cylinder 14 is lifted by the plate, the fixing strip 901 is lifted upward, the fixing block 902 is upwardly slid in the sliding groove 8 and limits the fixing strip 901, the air pipe 903 is lifted upward by the fixing strip 901, one end of the air pipe 903 is communicated with the air groove 20 on the hot-pressing plate two 4 and the hot-pressing plate three 5, the air blown by the air blower 18 is blown out from the other end of the air groove 20 on the top of the hot-pressing plate two 4 and the hot-pressing plate three 5, the plate on the hot-pressing plate two 4 and the hot-pressing plate three 5 is cooled and blown, the new plate is pushed away from the top of the hot-pressing plate two 4 and the hot-pressing plate three 5, the plate is cooled and pushed, and the plate is prevented from being adhered to the top of the hot-pressing plate two 4 and the hot-pressing plate three 5.

[0031] The technical scheme provided by the utility model, through setting up the upper hot-pressing tool 2 and the lower hot-pressing tool 6, when hot-pressing operation is carried out, after the upper conveying belt 12 and the lower conveying belt 13 on the conveying support 11 send the plate to the top of the hot-pressing plate two 4 and the hot-pressing plate three 5, the upper hot-pressing tool 2 drives the hot-pressing plate one 3 to move downward, the hot-pressing plate one 3 drives the connecting column 21 to move downward, the connecting column 21 moves downward and penetrates the hot-pressing plate three 5 and drives the fixing ring to move downward, the fixing ring drives the hot-pressing plate two 4 to move downward, when the hot-pressing plate two 4 is in contact with the plate on the top of the hot-pressing plate three 5, the hot-pressing plate two 4 stops moving, until the hot-pressing plate one 3 is in contact with the plate on the top of the hot-pressing plate two 4, hot-pressing operation can be carried out.

[0032] When the plate is sent to the top of the heat pressing plate two 4 and the heat pressing plate three 5 by the upper conveying belt 12 and the lower conveying belt 13, the plate will first contact the cleaning brush cylinder 14, and the plate will lift the cleaning brush cylinder 14 up, so that the cleaning brush cylinder 14 slides up in the sliding groove 8, and the cleaning brush cylinder 14 will continue to move to the top of the heat pressing plate two 4 and the heat pressing plate three 5 after lifting the plate, and the cleaning brush cylinder 14 will clean the dust, debris and other organic impurities on the surface of the plate during the movement, so that the impurities are swept off the plate, and the impurities will fall into the inside of the material frame 15 and then be blown into the air suction fan 19 through the through slot two 17 by the air blower 18, and the air blower 18 and the air suction fan 19 on the other side of the heat pressing support 1 can continue to cooperate to clean the waste generated during the heat pressing after the plate leaves the top of the heat pressing plate two 4 and the heat pressing plate three 5, so that the dust, debris and other organic impurities on the surface of the plate are cleaned in time before heat pressing, and the waste generated during the heat pressing can be cleaned after the plate leaves, so that the structure of the plate is stable, and the quality of the plate product is finally affected.

[0033] When the plate is sent to the top of the heat pressing plate two 4 and the heat pressing plate three 5 by the upper conveying belt 12 and the lower conveying belt 13, the plate will first contact the cleaning brush cylinder 14, and the plate will lift the cleaning brush cylinder 14 up, so that the cleaning brush cylinder 14 slides up in the sliding groove 8, and the cleaning brush cylinder 14 will continue to move to the top of the heat pressing plate two 4 and the heat pressing plate three 5 after lifting the plate, and the cleaning brush cylinder 14 will clean the dust, debris and other organic impurities on the surface of the plate during the movement, so that the impurities are swept off the plate, and the impurities will fall into the inside of the material frame 15 and then be blown into the air suction fan 19 through the through slot two 17 by the air blower 18, and the air blower 18 and the air suction fan 19 on the other side of the heat pressing support 1 can continue to cooperate to clean the waste generated during the heat pressing after the plate leaves the top of the heat pressing plate two 4 and the heat pressing plate three 5, so that the dust, debris and other organic impurities on the surface of the plate are cleaned in time before heat pressing, and the waste generated during the heat pressing can be cleaned after the plate leaves, so that the structure of the plate is stable, and the quality of the plate product is finally affected.

[0034] The utility model covers any alternative, modification, equivalent method and scheme which is made on the essence and range of the utility model. In order to make the public have the thorough understanding of the utility model, the specific details are explained in the above preferred embodiment of the utility model, and the utility model can be completely understood without the description of these details for the person skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the utility model, the well-known method, process, flow, element and circuit are not explained in detail.

[0035] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, and the like.

[0036] The above only describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A bamboo board reorganization double-layer hot pressing device, characterized in that, Include: Hot pressing support (1), the middle of the hot pressing support (1) is provided with a through slot one (10), the top and bottom of the through slot one (10) are fixedly connected with an upper hot pressing tool (2) and a lower hot pressing tool (6) respectively, the bottom of the upper hot pressing tool (2) is fixedly connected with a hot pressing plate one (3), the top of the lower hot pressing tool (6) is fixedly connected with a hot pressing plate three (5), the two sides of the hot pressing plate one (3) are fixedly connected with connecting columns (21), the outer surface of the connecting column (21) is fixedly connected with a fixed ring, a hot pressing plate two (4) is arranged between the hot pressing plate one (3) and the hot pressing plate three (5), the top of the fixed ring is in contact with the bottom of the hot pressing plate two (4), one end of the connecting column (21) away from the hot pressing plate one (3) penetrates the hot pressing plate three (5), the two sides of the hot pressing support (1) are fixedly connected with two fixed frames (7), two slide grooves (8) are formed in the fixed frame (7), the fixed frame (7) is slidably connected with a cleaning brush cylinder (14) through the slide groove (8), the two ends of the cleaning brush cylinder (14) are fixedly connected with limit discs (16), a ventilation mechanism (9) is installed on one side of the cleaning brush cylinder (14), the ventilation mechanism (9) comprises a fixed strip (901) sleeved on the cleaning brush cylinder (14), one side of the fixed strip (901) is fixedly connected with a fixed block (902) sliding in the slide groove (8), one end of the fixed strip (901) away from the fixed block (902) is fixedly connected with a ventilation pipe (903) penetrating the fixed strip (901).

2. The bamboo board reorganization double-layer hot-pressing device according to claim 1, characterized in that, One side of the hot pressing support (1) is provided with a conveying mechanism, the conveying mechanism comprises a conveying support (11), an upper conveying belt (12) and a lower conveying belt (13) are placed on the conveying support (11), and the upper conveying belt (12) and the lower conveying belt (13) are arranged in an upper and lower mode.

3. The device according to claim 1, wherein the device is characterized by: Two sides of the fixed frame (7) are provided with a through slot two (17) below the slide groove (8) located at a low position, a material frame (15) is fixedly connected between the fixed frame (7), and the two sides of the material frame (15) are communicated with the through slot two (17).

4. The device according to claim 1, wherein the device is characterized by: The two sides of the hot pressing support (1) are fixedly connected with air blowers (18) capable of blowing dust, debris and other organic impurities to one side, and one end of the ventilation pipe (903) is communicated with a blowing port of the air blower (18).

5. The device according to claim 4, wherein the device further comprises a second heating plate, and the second heating plate is arranged on the other side of the bamboo board. The two sides of the hot pressing support (1) are fixedly connected with air suction machines (19) capable of absorbing dust, debris and other organic impurities on the opposite side of the air blower (18).

6. The bamboo board reorganization double-layer hot-pressing device according to claim 1, characterized in that, Ventilation grooves (20) are formed in the hot pressing plate two (4) and the hot pressing plate three (5), one end of the ventilation groove (20) is formed in one side of the hot pressing plate two (4) and the hot pressing plate three (5) and located directly below the ventilation pipe (903), and the other end of the ventilation groove (20) is located at the top of the hot pressing plate two (4) and the hot pressing plate three (5).