A density board press forming system

Abstract

The application relates to the technical field of density board production, and particularly discloses a density board pressing and forming system which comprises a conveying belt group and a paving machine used for paving wood fibers onto the conveying belt group, further comprises a moisture sensor used for acquiring the water content of the wood fibers, and the paving machine and the moisture sensor are arranged in sequence along the conveying direction of the conveying belt group. The application has the effect of improving the yield of the density board.

Description

Technical Field

[0001] This application relates to the field of MDF production technology, and in particular to a MDF pressing and molding system. Background Technology

[0002] Medium-density fiberboard (MDF) is a type of engineered wood product made by bonding wood fibers together with adhesives. It has good performance characteristics and is widely used in engineering applications.

[0003] The processing of MDF includes raw material processing and pressing. When processing raw materials, the wood must first be processed into wood fibers, then the wood fibers are dehydrated, and finally the wood fibers are put into the silo.

[0004] When MDF is pressed and formed, the wood fibers in the hopper are first spread onto the conveyor belt by a spreading machine. Then, the wood fibers are pre-compressed by a pre-compressor. Next, the wood fibers are squeezed by two steel belts in a hot press, while the steel belts are heated by heat-conducting oil in the rollers of the hot press to achieve hot pressing, thereby forming the wood fibers into a board shape. After pressing, the edges of the board-shaped semi-finished product are trimmed to form the finished MDF.

[0005] During the pressing process of MDF (Medium-Density Fiberboard), the moisture content of the wood fibers has a significant impact on the quality of the MDF. High moisture content in the wood fibers can easily cause delamination and bubbling in the boards during molding, leading to the generation of waste boards. In continuous production, waste boards are mixed with qualified boards and shipped out together, affecting the yield rate of MDF products and requiring improvement. Summary of the Invention

[0006] In order to improve the yield of MDF products leaving the factory, this application provides a MDF pressing and molding system.

[0007] The density board pressing and molding system provided in this application adopts the following technical solution:

[0008] A density board pressing and molding system includes a conveyor belt assembly and a laying machine for laying wood fibers onto the conveyor belt assembly, and also includes a moisture sensor for obtaining the moisture content of the wood fibers. The laying machine and the moisture sensor are arranged sequentially along the transmission direction of the conveyor belt assembly.

[0009] By adopting the above technical solution, during the pressing and molding of MDF, the wood fibers are first laid onto the conveyor belt assembly by a laying machine, and then the wood fibers are conveyed by the conveyor belt assembly. When the wood fibers are conveyed to the moisture sensor, the moisture sensor detects and obtains the moisture content in the wood fibers. If the moisture content in the wood fibers is too high, the operator can increase the dehydration intensity during the dehydration process to reduce the moisture content of the wood fibers entering the silo.

[0010] By adding a moisture sensor to obtain the moisture content in the wood fibers, it is easier for workers to separate waste boards and adjust the dehydration intensity of the wood fibers during dehydration. This ensures that the moisture content of the wood fibers before hot pressing meets the requirements, thereby improving the yield of MDF products leaving the factory.

[0011] Optionally, it also includes a receiving box and a hot press. The conveyor belt group includes a main conveyor belt and a secondary conveyor belt. The main conveyor belt is used to transfer wood fibers to the secondary conveyor belt, and the secondary conveyor belt is used to transfer wood fibers to the hot press.

[0012] The main conveyor belt includes a main frame, a fixed roller, an adjusting roller, a tensioning roller, and a belt. The belt is sleeved on the fixed roller, the adjusting roller, and the tensioning roller. The adjusting roller is located at one end of the belt near the secondary conveyor belt. The fixed roller, the adjusting roller, and the tensioning roller are all rotatably mounted on the main frame. The adjusting roller is slidably mounted on the main frame along the conveying direction of the main conveyor belt. The tensioning roller is slidably mounted on the main frame and is used to keep the belt taut. The adjusting roller can be moved to allow a gap for wood fibers to pass through between the belt and the secondary conveyor belt. The receiving box is located below the adjusting roller.

[0013] By employing the above technical solution, when the moisture content of the wood fibers is too high, the adjusting roller is moved away from the secondary conveyor belt, causing the end of the belt closest to the secondary conveyor belt to contract away from it. This creates a gap between the main conveyor belt and the secondary conveyor belt, allowing the wood fibers on the main conveyor belt to pass through and enter the receiving box. The tensioning roller is then slid to maintain belt tension. Once the moisture content of the wood fibers meets the requirements, the adjusting roller and the tensioning roller are reset to reduce the distance between the main conveyor belt and the secondary conveyor belt, allowing the wood fibers on the main conveyor belt to be transferred back to the secondary conveyor belt, and then from there to the hot press.

[0014] This setup allows for the recycling of wood fibers with high moisture content, minimizing waste and avoiding the need for cutting and recycling waste boards produced due to the high moisture content of the wood fibers.

[0015] Optionally, the main conveyor belt further includes a connecting seat, a first slider, a second slider, and a driving component. The first slider and the second slider are rotatably mounted on the connecting seat. The adjusting roller and the tensioning roller are also rotatably mounted on the connecting seat. The rotation axis of the first slider is coaxial with the rotation axis of the adjusting roller, and the rotation axis of the second slider is coaxial with the rotation axis of the tensioning roller. The main frame is provided with a first slide groove and a second slide groove. The first slider is slidably mounted in the first slide groove, and the extension direction of the first slide groove is consistent with the conveying direction of the main conveyor belt. The second slider is slidably mounted in the second slide groove, and the extension direction of the second slide groove is offset from the extension direction of the first slide groove. The driving component is used to drive the second slider to move in the second slide groove.

[0016] By adopting the above technical solution, when adjusting the distance between the main conveyor belt and the auxiliary conveyor belt, the second slider is driven to move within the second chute by a driving component, thereby driving the tension roller to move via the connecting seat. Since both the first and second sliders are mounted on the connecting seat, they move together, causing the adjusting rod to move as well. The first chute acts as a limit, allowing the first slider to move along the conveying direction of the main conveyor belt, thus causing the adjusting roller to move in the same direction, thereby adjusting the distance between the main and auxiliary conveyor belts. The synchronously moving tension roller keeps the belt taut.

[0017] This configuration allows for synchronous adjustment of the tension roller and the adjusting roller by simply moving the second slider, thereby enabling belt adjustment and improving the ease of belt adjustment.

[0018] Optionally, it may also include a blocking device, which includes a baffle that is slidably disposed on the secondary conveyor belt in a vertical direction.

[0019] By adopting the above technical solution, when the moisture content of the wood fibers meets the requirements, the baffle moves upward to allow the wood fibers to be transported normally on the secondary conveyor belt. When the moisture content of the wood fibers is too high, the baffle moves downward, thereby blocking the wood fibers from continuing to be transported on the secondary conveyor belt. Because the moisture content of the wood fibers is too high, the belt of the main conveyor belt can move between the secondary conveyor belt and create a gap for the wood fibers to pass through, causing the transmission of wood fibers on the secondary conveyor belt to be interrupted. Since MDF has a set board length, after the wood fibers on the secondary conveyor belt are interrupted, the length of the last board during the interruption period is likely to be less than the standard, resulting in waste boards. By moving the baffle to block the wood fibers, the remaining wood fibers are cut off while ensuring that the length of the last board meets the requirements, thereby reducing the waste of wood fibers.

[0020] Optionally, the blocking device further includes a linkage mechanism, which includes an upper moving frame, a fixed pulley rotatably mounted on the upper moving frame, a linkage rope with its two ends respectively connected to the first slider and the baffle, and an upper moving spring for driving the baffle to move upward. The baffle is slidably mounted on the upper moving frame in the vertical direction, the fixed pulley is located on the lower side of the baffle, and the linkage rope is wound around the fixed pulley.

[0021] By adopting the above technical solution, when the moisture content of the wood fibers is detected to be high, the second slider is driven to move by the driving component, thereby moving the tension roller. Under the action of the first slider, the first chute, and the connecting seat, the adjusting roller moves, thereby creating a gap between the belt and the secondary conveyor belt for the wood fibers to pass through. Simultaneously with the movement of the first slider, the end of the linkage rope connected to the first slider is pulled away from the secondary conveyor belt. Under the action of the fixed pulley, the connection end of the linkage rope to the baffle moves downward, thereby causing the baffle to move downward. That is, when the adjusting roller moves to create a gap between the belt and the secondary conveyor belt, the baffle moves downward and blocks the wood fibers on the secondary conveyor belt. Compared to separately controlling and adjusting the adjusting roller and the baffle, this setup reduces the number of driving devices and allows for synchronous adjustment of the adjusting roller and the baffle, meeting the control requirements when the moisture content of the wood fibers is too high.

[0022] When the moisture content of the wood fiber meets the requirements, the adjusting roller and the first slider are reset. Under the action of the upward spring, the baffle is moved up and reset and the position of the baffle is maintained to ensure the normal transmission of wood fiber on the secondary conveyor belt.

[0023] Optionally, a limit block is provided on the baffle, and a positioning block is provided on the upper moving frame for abutting against the limit block, the positioning block being located below the limit block.

[0024] By adopting the above technical solution, the limiting block and the positioning block restrict the movement range of the baffle, limiting the baffle from moving further downward and minimizing the interference of the baffle on the normal operation of the secondary conveyor belt.

[0025] Optionally, the upper moving frame is slidably disposed on the transverse moving frame along the sliding direction of the adjusting roller. The linkage mechanism further includes a transverse moving spring for driving the upper moving frame to move away from the belt. A clamping block is disposed on the transverse moving frame. The clamping block is located on the side of the upper moving frame away from the belt and is used to abut against the upper moving frame. When the limiting block abuts against the positioning block, the upper moving frame abuts against the clamping block.

[0026] By adopting the above technical solution, when the adjusting roller moves away from the secondary conveyor belt, the first slider moves together. Since the upper moving frame remains in contact with the clamping block even when the limiting block and the positioning block are in contact, during the movement of the first slider, the linkage rope and the reset rod first drive the baffle downwards until the limiting block and the positioning block are in contact. Continuing to move the adjusting roller, the upper moving frame moves, causing the baffle to move together towards the main conveyor belt, thereby pushing the wood fibers blocked by the baffle on the secondary conveyor belt into the receiving box. This design further reduces the waste of wood fibers.

[0027] When the adjustment roller is removed and reset, the upper frame resets under the action of the transverse spring, and the baffle resets under the action of the upper spring.

[0028] Optionally, the upper surface of the main conveyor belt is higher than the upper surface of the secondary conveyor belt, and an inclined guide plate is provided on the main frame. The inclined guide plate is inclined, and the end of the inclined guide plate near the belt is higher than the end of the inclined guide plate near the secondary conveyor belt.

[0029] By adopting the above technical solution, when the wood fibers on the main conveyor belt are transferred to the secondary conveyor belt, the inclined guide plate plays a guiding role, which enables the wood fibers to maintain continuous transmission without interruption, thus ensuring the quality of the produced MDF.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. By adding a moisture sensor to obtain the moisture content in the wood fibers, it is not only easier for workers to separate waste boards, but also easier for workers to adjust the dehydration intensity during the dehydration of wood fibers, which effectively improves the yield of MDF leaving the factory.

[0032] 2. By adjusting the rollers and tensioning rollers, the distance between the belt and the secondary conveyor belt can be adjusted. When a gap appears between the belt and the secondary conveyor belt to allow wood fibers to pass through, wood fibers with excessive moisture content can enter the receiving box through the gap for recycling, reducing the waste of wood fibers.

[0033] 3. By adding a blocking device, when the moisture content of the wood fiber is too high and the belt is adjusted by the adjusting roller, the excess wood fiber on the secondary conveyor belt can be blocked by the baffle and pushed into the receiving box by the baffle, which further reduces the waste of wood fiber. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0035] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0036] Figure 3This is a schematic diagram of the conveyor belt assembly highlighted in Embodiment 2 of this application.

[0037] Figure 4 This is a schematic diagram highlighting the main conveyor belt in Embodiment 2 of this application.

[0038] Figure 5 This is a schematic diagram of the structure of the blocking device in Embodiment 2 of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Conveyor belt assembly; 11. Main conveyor belt; 111. Main frame; 1111. First chute; 1112. Second chute; 112. Fixed roller; 113. Adjusting roller; 114. Tensioning roller; 115. Belt; 116. Connecting seat; 117. First slider; 118. Second slider; 119. Drive unit; 12. Secondary conveyor belt; 13. Inclined guide plate; 2. Paving machine; 3. Pre-compactor; 4. Hot press; 5. Moisture sensor; 6. Weighing sensor; 7. Metal detector; 8. Blocking device; 81. Baffle; 811. Limiting block; 82. Linkage mechanism; 821. Horizontal movement frame; 822. Upper movement frame; 8221. Linkage groove; 823. Horizontal movement spring; 824. Upper movement spring; 825. Fixed pulley; 826. Linkage rope; 827. Guide rod; 828. Clamping block; 829. Positioning block; 9. Receiving box. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0042] This application discloses a density board pressing and molding system.

[0043] Example 1:

[0044] Reference Figure 1 , Figure 2 The MDF pressing and molding system includes a conveyor belt assembly 1, a laying machine 2 for laying wood fibers onto the conveyor belt assembly 1, a pre-pressing machine 3 for pre-pressing the wood fibers, and a hot press 4 for hot-pressing the wood fibers.

[0045] Reference Figure 1 , Figure 2 The conveyor belt group 1 and the hot press 4 are arranged along the conveying direction of the conveyor belt group 1. The pre-press 3 is installed on the conveyor belt group 1 so that the wood fibers on the conveyor belt group 1 can be transferred to the hot press 4 after pre-pressing.

[0046] Reference Figure 1 , Figure 2The MDF pressing and molding system also includes a moisture sensor 5 for measuring the moisture content of the wood fibers, a weighing sensor 6 for measuring the mass of the wood fibers, and a metal detector 7 for detecting metal. If the moisture content of the wood fibers detected by the moisture sensor 5 is too high, workers can reduce the moisture content of the wood fibers entering the hopper by increasing the dehydration intensity during dehydration, thus ensuring that the moisture content of the wood fibers laid on the conveyor belt assembly 1 meets the requirements. The weighing sensor 6, by measuring the mass of each segment of wood fibers, ensures that the mass of the MDF is within the required range. The metal detector detects whether the wood fibers contain metal, minimizing the generation of waste boards carrying metal.

[0047] Reference Figure 1 , Figure 2 Moisture sensor 5, weighing sensor 6 and metal detector 7 are all installed on conveyor belt group 1. The paving machine 2, moisture sensor 5, weighing sensor 6, pre-compactor 3 and metal detector 7 are arranged in sequence along the transmission direction of the conveyor belt.

[0048] The implementation principle of Example 1 is as follows: After the wood fibers are laid on the conveyor belt group 1, the wood fibers are detected by the moisture sensor 5, the weighing sensor 6 and the metal detector 7 in sequence, so as to minimize the generation of waste boards and improve the yield of MDF leaving the factory.

[0049] Example 2:

[0050] Reference Figure 3 The difference between this embodiment and embodiment 1 is that it also includes a blocking device 8 and a receiving box 9. The conveyor belt group 1 includes a main conveyor belt 11 and a secondary conveyor belt 12. The main conveyor belt 11 is used to transfer wood fibers to the secondary conveyor belt 12, and the secondary conveyor belt 12 is used to transfer wood fibers to a hot press (not shown in the figure).

[0051] Reference Figure 4 The main conveyor belt 11 includes a main frame 111, multiple fixed rollers 112, adjusting rollers 113, tension rollers 114, and belt 115. Each fixed roller 112 is rotatably mounted on the main frame 111. The belt 115 is sleeved on the fixed rollers 112, adjusting rollers 113, and tension rollers 114. The adjusting roller 113 is located at one end of the belt 115 near the secondary conveyor belt 12. The tension roller 114 is used to keep the belt 115 taut.

[0052] Reference Figure 4The main conveyor belt 11 also includes two connecting seats 116, two first sliders 117, two second sliders 118, and two driving members 119 that drive different second sliders 118 to move. The two connecting seats 116 are located on both sides of the adjusting roller 113 and the tensioning roller 114, respectively, and the two connecting seats 116 are arranged symmetrically. The two ends of the adjusting roller 113 are rotatably mounted on different connecting seats 116, and the two ends of the tensioning roller 114 are rotatably mounted on different connecting seats 116.

[0053] Reference Figure 4 Two first sliders 117 are rotatably mounted on different connecting seats 116, and the rotation axes of the two first sliders 117 are coaxial with the rotation axis of the adjusting roller 113. Two second sliders 118 are rotatably mounted on different connecting seats 116, and the rotation axes of the two second sliders 118 are coaxial with the rotation axis of the tension roller 114.

[0054] Reference Figure 4 The main frame 111 has two first chute 1111 extending along the transmission direction of the main conveyor belt 11, which transmits horizontally. Two first sliders 117 are slidably disposed in different first chute 1111, that is, the adjusting roller 113 is slidably disposed on the main frame 111 along the transmission direction of the main conveyor belt 11. The adjusting roller 113 can be moved to a gap between the belt 115 and the auxiliary conveyor belt 12 for wood fibers to pass through. The receiving box 9 is placed on the lower side of the adjusting roller 113 and the end of the auxiliary conveyor belt 12 near the belt 115.

[0055] Reference Figure 4 The main frame 111 also has two second slide grooves 1112 extending vertically, and two second sliders 118 are slidably disposed in different second slide grooves. The driving component 119 is a hydraulic cylinder whose piston rod extends and retracts vertically. The end of the piston rod of the driving rod is fixedly connected to the adjacent second slider 118 to drive the second slider 118 to move in the second slide groove 1112.

[0056] Reference Figure 4 When the moisture content of the wood fiber is too high or when the wood fiber contains metal, the second slider 118 is driven downward by the drive component 119. The second slider 118 drives the first slider 117 to move away from the secondary conveyor belt 12 via the connecting seat 116. The tension roller 114 moves downward, and the adjusting roller 113 moves away from the secondary conveyor belt 12. This causes the end of the belt 115 near the secondary conveyor belt 12 to move away from the secondary conveyor belt 12, creating a gap between the belt 115 and the secondary conveyor belt 12 for the wood fiber to pass through. The wood fiber enters the receiving box 9 through this gap.

[0057] Reference Figure 4An inclined guide plate 13 is mounted on the main frame 111 and fixed to the two first sliders 117. The inclined guide plate 13 is inclined, with the end of the inclined guide plate 13 near the belt 115 higher than the end of the inclined guide plate 13 near the secondary conveyor belt 12. The height of the end of the inclined guide plate 13 near the belt 115 is lower than the height of the upper surface of the belt 115, while the height of the end of the inclined guide plate 13 near the secondary conveyor belt 12 is higher than the height of the upper surface of the secondary conveyor belt 12. The inclined guide plate 13 serves a guiding function, allowing the wood fibers on the belt 115 to be transferred to the secondary conveyor belt 12 via the inclined guide plate 13.

[0058] Reference Figure 5 The blocking device 8 includes a baffle 81 located on the upper side of the secondary conveyor belt 12 and two sets of linkage mechanisms 82 arranged symmetrically, with the two sets of linkage mechanisms 82 respectively located on both sides of the baffle 81.

[0059] Reference Figure 5 The linkage mechanism 82 includes a transverse frame 821 fixed to the frame of the auxiliary conveyor belt 12, an upper frame 822 slidably disposed on the transverse frame 821 along the sliding direction of the adjusting roller 113, and a transverse spring 823 driving the transverse frame 821 to move away from the main conveyor belt 11. Guide rods 827 and abutment blocks 828 are fixed on both transverse frames 821. The abutment blocks 828 are located on the side of the upper frame 822 away from the belt 115 and are used to abut against adjacent upper frames 822. The guide rods 827 extend along the sliding direction of the upper frames 822, pass through adjacent upper frames 822, and the upper frames 822 are slidably disposed on adjacent guide rods 827. The transverse spring 823 is sleeved on the adjacent guide rod 827. The transverse spring 823 is located on the side of the upper moving frame 822 near the belt 115 and extends and retracts along the sliding direction of the upper moving frame 822. The two ends of the transverse spring 823 abut against the transverse moving frame 821 and the end face of the upper moving frame 822 near the belt 115, respectively.

[0060] Reference Figure 5 The linkage mechanism 82 also includes an upward spring 824 for driving the baffle 81 upward, a fixed pulley 825 rotatably mounted on the upper moving frame 822, and a linkage rope 826 for driving the baffle 81 to move. The upper moving frame 822 has a linkage groove 8221 extending vertically. Limit blocks 811 are fixed on both opposite sidewalls of the baffle 81, and the two limit blocks 811 are slidably mounted in different linkage grooves 8221, meaning the baffle 81 is slidably mounted on the upper moving frame 822 vertically. Positioning blocks 829 are fixed on the lower wall of both linkage grooves 8221, located below the adjacent limit blocks 811 and used to abut against the adjacent limit blocks 811. The upward spring 824 is located in the linkage groove 8221. The upward spring 824 is sleeved on the adjacent positioning block 829 and extends and retracts in the vertical direction. The two ends of the upward spring 824 abut against the lower groove wall of the linkage groove 8221 and the adjacent limiting block 811, respectively.

[0061] Reference Figure 5 The fixed pulley 825 is located on which the linkage rope 826 is wound. The two ends of the linkage rope 826 are fixedly connected to the adjacent limiting block 811 and the adjacent first slider 117, respectively. When the limiting block 811 abuts against the positioning block 829, the baffle 81 abuts against the auxiliary conveyor belt 12, and the upper moving frame 822 still abuts against the pressing block 828. That is, when the upper moving spring 824 is compressed to the point that the limiting block 811 abuts against the positioning block 829, the force exerted by the transverse moving spring 823 on the upper moving frame 822 is still much greater than the force exerted by the upper moving spring 824 on the limiting block 811.

[0062] The implementation principle of Example 2 is as follows: When the moisture content of the wood fiber is detected to be too high or the wood fiber is mixed with metal, the second slider 118 is driven to move downward by the drive component 119. The second slider 118 drives the first slider 117 to move away from the secondary conveyor belt 12 through the connecting seat 116. The adjusting roller 113 moves, and the end of the belt 115 near the secondary conveyor belt 12 retracts to create a gap between it and the secondary conveyor belt 12, allowing the wood fiber to enter the receiving box 9. The end of the linkage rope 826 connected to the first slider 117 moves with the first slider 117, causing the linkage rope 826 connected to the limiting block 811 to move downward, and the upward spring 824 to compress until the limiting block 811 abuts against the positioning block 829. The adjusting roller 113 continues to move, the transverse spring 823 is compressed, and the upward frame 822 moves towards the belt 115, causing the baffle 81 to move towards the belt 115, thereby pushing the wood fiber on the secondary conveyor belt 12 into the receiving box 9.

[0063] When the wood fibers meet the pressing requirements, the second slider 118 is driven to move upward and reset via the drive component 119, the tension roller 114 moves upward and resets, and the adjusting roller 113 resets under the action of the connecting seat 116 and the first slider 117, and the end of the belt 115 near the secondary conveyor belt 12 resets. At the same time, the upper moving frame 822 resets under the action of the transverse spring 823, and the limiting block 811 resets under the action of the upper moving spring 824, so that the baffle 81 is fully reset.

[0064] With this setup, when wood fibers do not meet the pressing requirements, the non-compliant wood fibers can be recycled through the receiving box 9. In addition, excess wood fibers on the secondary conveyor belt 12 that do not meet the length requirements of the MDF can be pushed into the receiving box 9 by the baffle 81 for recycling. On the one hand, this minimizes the waste of wood fibers, and on the other hand, it reduces the scrap rate of the MDF, further improving the yield rate of the MDF when it leaves the factory.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A system for the press forming of density boards, comprising a conveyor belt group (1) and a laying machine (2) for laying wood fibres onto the conveyor belt group (1), characterised in that: The moisture sensor (5) for obtaining the moisture content of the wood fiber is further included, and the paving machine (2) and the moisture sensor (5) are arranged in sequence along the conveying direction of the conveying belt group (1); The receiving box (9) and the hot press (4) are further included, the conveying belt group (1) comprises a main conveying belt (11) and a sub-conveying belt (12), the main conveying belt (11) is used for conveying the wood fiber to the sub-conveying belt (12), and the sub-conveying belt (12) is used for conveying the wood fiber to the hot press (4); The main conveying belt (11) comprises a main frame (111), a fixed roller (112), an adjusting roller (113), a tensioning roller (114) and a belt (115), the belt (115) is sleeved on the fixed roller (112), the adjusting roller (113) and the tensioning roller (114), the adjusting roller (113) is located at one end of the belt (115) close to the sub-conveying belt (12), the fixed roller (112), the adjusting roller (113) and the tensioning roller (114) are rotationally arranged on the main frame (111), the adjusting roller (113) is slidingly arranged on the main frame (111) along the conveying direction of the main conveying belt (11), the tensioning roller (114) is slidingly arranged on the main frame (111) and is used for keeping the belt (115) in tension, the adjusting roller (113) can be moved to a gap between the belt (115) and the sub-conveying belt (12) for the wood fiber to pass through, and the receiving box (9) is arranged on the lower side of the adjusting roller (113); The main conveying belt (11) further comprises a connecting seat (116), a first sliding block (117), a second sliding block (118) and a driving member (119), the first sliding block (117) and the second sliding block (118) are rotationally arranged on the connecting seat (116), the adjusting roller (113) and the tensioning roller (114) are rotationally arranged on the connecting seat (116), the rotating shaft of the first sliding block (117) is coaxial with the rotating shaft of the adjusting roller (113), the rotating shaft of the second sliding block (118) is coaxial with the rotating shaft of the tensioning roller (114), the first sliding groove (1111) and the second sliding groove (1112) are formed in the main frame (111), the first sliding block (117) is slidingly arranged in the first sliding groove (1111), the extension direction of the first sliding groove (1111) is consistent with the conveying direction of the main conveying belt (11), the second sliding block (118) is slidingly arranged in the second sliding groove (1112), the extension direction of the second sliding groove (1112) is offset from the extension direction of the first sliding groove (1111), and the driving member (119) is used for driving the movement of the second sliding block (118) in the second sliding groove (1112); The blocking device (8) is further included, and the blocking device (8) comprises a baffle (81) slidingly arranged on the sub-conveying belt (12) in the vertical direction; The blocking device (8) further comprises a linkage mechanism (82), the linkage mechanism (82) comprising an upper moving frame (822), a fixed pulley (825) rotatably arranged on the upper moving frame (822), linkage ropes (826) respectively connected at two ends to the first sliding block (117) and the blocking plate (81), an upper moving spring (824) for driving the blocking plate (81) to move upwards, the blocking plate (81) being slidably arranged on the upper moving frame (822) in the vertical direction, the fixed pulley (825) being located at the lower side of the blocking plate (81), and the linkage ropes (826) being wound around the fixed pulley (825).

2. A system for pressing a density board according to claim 1, characterized in that: The blocking plate (81) is provided with a limiting block (811), and the upper moving frame (822) is provided with a positioning block (829) for abutting against the limiting block (811), the positioning block (829) being located at the lower side of the limiting block (811).

3. A system for pressing a density board according to claim 2, characterized in that: The upper moving frame (822) is slidably arranged on the horizontal moving frame (821) in the sliding direction of the adjusting roller (113), and the linkage mechanism (82) further comprises a horizontal moving spring (823) for driving the upper moving frame (822) to move away from the belt (115), the horizontal moving frame (821) being provided with an abutting block (828), the abutting block (828) being located at the side of the upper moving frame (822) away from the belt (115) and being used for abutting against the upper moving frame (822), and the upper moving frame (822) abutting against the abutting block (828) when the limiting block (811) abuts against the positioning block (829).

4. The system for pressing a density board according to claim 1, wherein: The upper end surface of the main conveying belt (11) is higher than the upper end surface of the auxiliary conveying belt (12), and the main frame (111) is provided with an inclined guide plate (13), the inclined guide plate (13) being arranged obliquely, and the end of the inclined guide plate (13) close to the belt (115) being higher than the end of the inclined guide plate (13) close to the auxiliary conveying belt (12).

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