Segmented medium density fiberboard paving thickness adjustment mechanism

Abstract

The segmented medium density fiberboard paving thickness adjustment mechanism disclosed in the present invention comprises: an integral frame beam, a pressure roller group, a rotating arm, and an electric push rod; because the thickness of the slab produced from the present invention in the horizontal direction is segmented and adjusted according to the process requirements, the fibers with higher surface thickness will be removed from the surface of the slab by the sweeping roller and the dust suction port, and the fibers with lower surface thickness will be retained, thereby finally completing the uniformity of the lateral density distribution of the slab in the medium density fiberboard paving section.

Description

Technical Field

[0001] The invention relates to a medium density fiberboard paving machine, and in particular to a segmented medium density fiberboard paving thickness adjustment mechanism which can segmentally adjust the paving thickness of a slab in the width direction of a molding line. Background Art

[0002] In the production process of medium / high density continuous press fiberboard, the transverse surface density difference of the paving is one of the important indicators affecting the qualified rate of the finished board, and it is also an important factor affecting the life of the press steel belt. Recently, more and more domestic and foreign board manufacturers have begun to expand the market of ultra-thin density boards of 1mm to 4mm, and better control the transverse density difference of the finished board of ultra-thin density boards within the range of less than 2%. The surface density control of the paving section has begun to play an increasingly critical role, and the requirements for the paving thickness of the slab have begun to become higher and higher.

[0003] At present, the most common adjustment mechanism on some advanced density board production lines at home and abroad is the pad adjustment device. The pad adjustment mechanism is arranged directly below the sweeping roller in the paving and forming section. The core component of the pad adjustment mechanism is several pads that can adjust the height independently. These pads are evenly distributed in sections along the axis of the sweeping roller in the width direction of the production line, or the pads on both sides of the belt are of the same width, with an independent pad in the middle. The distance between the belt and the sweeping roller varies depending on the height of the pad, so the lateral sweeping amount of the paving section is also different, so as to control the final slab paving thickness and achieve the lateral density distribution standard of the finished density board.

[0004] However, the existing pad adjustment mechanism has the following defects:

[0005] 1. Due to the lateral toughness of the forming belt, the height of the pad is limited, especially when producing medium and thick density boards, the actual effect of segmented adjustment is not obvious;

[0006] 2. The adjustment device is installed under the forming belt. After adjustment, the forming belt will be deformed due to long-term support, which will affect the service life of the forming belt;

[0007] 3. A lot of dust will be generated during the production of fiberboard. The environment around the production line is relatively harsh. The long-term dry friction between the pad and the bottom surface of the forming belt will accumulate dust blocks, thus affecting the adjustment accuracy and life of the device;

[0008] 4. Due to the limited engineering layout space of the existing pad device, it is difficult for operators to observe the adjustment effect and operation during adjustment or maintenance. The new adjustment mechanism introduced below is produced under this background. Summary of the invention

[0009] One of the technical problems to be solved by the present invention is: based on the non-deformation of the paving forming belt, a segmented medium density fiberboard paving thickness adjustment mechanism is provided, which can independently control the paving thickness of the medium density fiberboard blank in segments in the width direction of the production line.

[0010] The second technical problem to be solved by the present invention is to provide a segmented medium density fiberboard paving thickness adjustment mechanism which is more direct and effective in adjusting the paving thickness of the medium density fiberboard blank and more convenient in observing the operating status and performing maintenance operations.

[0011] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0012] The segmented medium density fiberboard paving thickness adjustment mechanism comprises:

[0013] An integral frame beam, which serves as a main frame in the segmented medium density fiberboard paving thickness adjustment mechanism, is used to install and fix the components required for the segmented medium density fiberboard paving thickness adjustment mechanism and can be raised and lowered, and can drive the segmented medium density fiberboard paving thickness adjustment mechanism to be lifted and pressed down as a whole;

[0014] There are two groups of rollers, each of which is equipped with several segmented rollers, and the power of each group of rollers comes from its own driving motor rather than the friction between the rollers and the surface of the slab; all the segmented rollers in the two groups of rollers are arranged in segments and staggered front and back above the paving slab, and the sum of the lengths of all the segmented rollers in the two groups of rollers can just cover the entire paving width; at least one segmented roller is a fixed segmented roller, and the rest are movable segmented rollers, and the fixed segmented rollers are connected to the frame beam as a whole, and their axis positions are relatively fixed to the frame beam;

[0015] Several rotating arms, each movable segmented pressing roller is supported by the corresponding rotating arm, so that each segmented pressing roller can independently complete the lifting and pressing movements;

[0016] Several electric push rods, all of which are installed on the frame beam and connected to the corresponding rotating arms, drive the corresponding rotating arms to move, so as to realize the lifting and pressing movement of each movable segmented pressure roller.

[0017] In a preferred embodiment of the present invention, the electric push rod is a product that integrates a motor and a ball screw, realizes the conversion of the rotational motion of the motor into linear motion, and can meet the requirements of high-precision position control.

[0018] In a preferred embodiment of the present invention, the rotating arm is a metal angle bracket, the corner of the metal angle bracket is hinged to the frame beam, one end of the metal angle bracket is hinged to the corresponding electric push rod, and the other end is hinged to the corresponding movable segmented pressure roller.

[0019] In a preferred embodiment of the present invention, the outer surfaces of all the segmented pressure rollers are circular smooth rollers without needle teeth, and the outer surface of each segmented roller is made of nylon.

[0020] In a preferred embodiment of the present invention, the linear speed of the contact surface between the roller on each segmented pressure roller and the paving slab is consistent with the speed of the forming belt.

[0021] In a preferred embodiment of the present invention, the fixed segmented pressure roller is rigidly fixed to the frame beam via two fixed arms, the axis position of the fixed segmented pressure roller is relatively fixed to the frame beam, and is lifted and pressed down together with the frame beam.

[0022] In a preferred embodiment of the present invention, the fixed segmented pressing roller is arranged in the middle position in the transverse direction of the paving slab.

[0023] In a preferred embodiment of the present invention, all movable segmented pressing rollers are arranged on both lateral sides of the paving slab.

[0024] In a preferred embodiment of the present invention, the positions and quantities of movable segmented pressing rollers arranged on both lateral sides of the paving slab are required to be symmetrical and the same.

[0025] In a preferred embodiment of the present invention, each movable segmented pressure roller and the corresponding rotating arm and electric push rod form a closed-loop mechanism, and the lifting and pressing down of each movable segmented pressure roller are accurately controlled by converting the electric push rod and the mechanism motion equation.

[0026] In a preferred embodiment of the present invention, both groups of pressure rollers are arranged in front of the sweeping roller. Compared with the traditional pad adjustment device, the segmented medium density fiberboard paving thickness adjustment mechanism of the present invention has the following characteristics:

[0027] 1. All the rollers are arranged just above the surface of the paved slab and have no contact with the forming belt, which completely avoids the damage caused by long-term deformation of the forming belt and increases the service life of the production equipment.

[0028] 2. The rise and fall adjustment of the pressure roller are controlled by an electric push rod, and its control accuracy can reach 0.01mm, which can fully meet the accuracy requirements of the mechanism adjustment. And the control method of the electric push rod can be connected to the PLC of the host computer, and the unmanned real-time adjustment function can be realized through the program.

[0029] 3. All the main supports, adjustment mechanisms and core rollers of the present invention are arranged directly above the forming conveyor, so there is a good field of view for observing the operation of the equipment and operating space for daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the forward installation of the adjustment mechanism.

[0031] Figure 2 This is a top view of the pressure roller group and pressure roller layout.

[0032] Figure 3 This is the working principle diagram of the side section of the pressure roller. DETAILED DESCRIPTION

[0033] In the present invention, most of the core components of the segmented medium density fiberboard paving thickness adjustment mechanism 1 of the present invention are arranged directly above the forming belt 5, and are located between the paving leveling device 2 and the paving sweeping device 3. Figure 1 As shown, the running direction of the production line is "paving leveling device 2-segmented medium density fiberboard paving thickness adjustment mechanism 1-paving leveling device 3".

[0034] In the present invention, all segmented rollers are core components of the entire segmented medium density fiberboard paving thickness adjustment mechanism 1. The outer cylindrical shape of all rollers is a round smooth roller without needle teeth, and the outer surface material of all rollers is required to be nylon.

[0035] like Figure 2 As shown, the number of pressure rollers is reasonably divided into several segments according to the width of the paving slab 4 (the specific number can be determined according to actual needs), and movable segmented pressure rollers 106 whose height can be adjusted up and down are arranged on both sides of the forming belt 5, and a fixed segmented pressure roller 107 is arranged in the middle position of the forming belt 5.

[0036] All segmented rollers are divided into two roller groups 104 and 105, and all segmented rollers in the two roller groups 104 and 105 are arranged in segments and staggered front and back above the paving slab 4, and the fixed segmented roller 107 is located in the roller group 104. Of course, a fixed segmented roller 107 in the middle of the forming belt 5 can be arranged on any roller group 104 and 105, and there is no specific requirement in the present invention.

[0037] Each set of rollers 104, 105 is driven by its own drive motor 108, and the friction between the rollers and the surface of the paving slab 4 is not the driving force for the rollers to rotate. The outer diameter of each segmented roller is the same, and the linear speed of the contact surface between the rollers and the slab in each segmented roller must be consistent with the running speed and direction requirements of the forming belt 5.

[0038] All movable segmented rollers 106 are arranged on both sides of the paving slab 4 in the lateral direction. The length of the movable segmented rollers 106 on both sides of the paving slab 4 is much shorter than the length of the fixed segmented rollers 107 (the specific size can be determined according to the actual design), and the positions and quantities of the movable segmented rollers 106 arranged on both sides of the paving slab 4 are required to be symmetrical and the same.

[0039] like Figure 3 As shown, viewed from the lateral section of the segmented medium density fiberboard paving thickness adjustment mechanism 1, the sum of the lengths of all movable segmented rollers 106 and fixed segmented rollers 107 must cover the entire width of the paving slab 4, thereby ensuring that the thickness of the paving slab 4 in the entire width direction can be adjusted in segments.

[0040] Except for the fixed segmented roller 107, each segmented movable roller 106 is movably mounted on the overall frame beam 101 through two rotating arms 103. The axis of each segmented movable roller 106 is arranged at one end, i.e., the lower end, of the corresponding rotating arm 103. The fulcrum of the rotating arm 103 is hinged on the frame beam 101. The other end, i.e., the upper end, of the rotating arm 103 is hinged to a push rod in an electric push rod 102. The electric push rod 102 is also fixed on the frame beam 101 through a foot support. This structure allows each segmented movable roller 106 to have an independent height adjustment closed-loop mechanism. The fixed segmented roller 107 is directly fixed on the frame beam 101 through a fixed arm and is not equipped with an electric push rod 102. Therefore, the relative position of the axis of the fixed segmented roller 107 and the overall frame beam 101 is fixed, and the fixed segmented roller 107 can only be driven to rotate by the driving motor of the roller group to which it belongs.

[0041] All core components are fixed on the overall frame beam 101. The frame beam 101, as the main frame of the present invention, can be lifted and pressed down by a lift, so the adjustment height of the fixed segmented pressing roller 107 is used as the reference height for thickness adjustment. Figure 1 As shown, the electric push rod 102 is extended and retracted to cause the rotating arm 103 to rotate around a fulcrum on the frame beam 101, thereby ultimately achieving the purpose of adjusting the height of the movable segmented pressure roller 106.

[0042] like Figure 3 As shown, each movable segmented pressure roller 106 on both sides of the forming belt 5 can freely adjust the height to press down the paving slab 4 based on the fixed segmented pressure roller 107 of the middle reference, so that after the paving slab passes through the segmented medium density fiberboard paving thickness adjustment mechanism 1, the entire transverse paving thickness can be freely adjusted in segments according to the actual needs of the production process.

[0043] In the present invention, the paving slab 4 enters the processing stage of the paving sweeping device 3 immediately after passing through the segmented medium density fiberboard paving thickness adjustment mechanism 1. The paving sweeping device 3 is equipped with a sweeping roller 302 and a dust suction port 301. Figure 2 As shown, because the thickness of the slab coming out of the present invention in the horizontal direction is adjusted in sections according to the process requirements, the fibers with higher surface thickness will be removed from the surface of the paving slab 4 by the sweeping roller 302 and the dust suction port 301, and the fibers with lower surface thickness will be retained, thereby finally completing the uniformity of the lateral density distribution of the slab in the medium density fiberboard paving section.

Claims

1. The segmented medium density fiberboard paving thickness adjustment mechanism is characterized by: include: An integral frame beam, which serves as a main frame in the segmented medium density fiberboard paving thickness adjustment mechanism, is used to install and fix the components required for the segmented medium density fiberboard paving thickness adjustment mechanism and can be raised and lowered, and can drive the segmented medium density fiberboard paving thickness adjustment mechanism to be lifted and pressed down as a whole; There are two groups of rollers, each of which is equipped with several segmented rollers. The power of each roller group comes from its own driving motor rather than the friction between it and the surface of the slab. All the segmented rollers in the two groups of rollers are arranged in segments and staggered front and back above the slab, and the sum of the lengths of all the segmented rollers in the two groups of rollers can just cover the entire paving width. At least one of the segmented rollers is a fixed segmented roller, and the rest are movable segmented rollers, wherein the fixed segmented roller is integrally connected to the frame beam, and the axis position thereof is relatively fixed to the frame beam; Several rotating arms, each movable segmented pressing roller is supported by the corresponding rotating arm, so that each segmented pressing roller can independently complete the lifting and pressing movements; Several electric push rods, all of which are installed on the frame beam and connected to the corresponding rotating arms, drive the corresponding rotating arms to move, so as to realize the lifting and pressing movement of each movable segmented pressure roller.

2. The segmented medium density fiberboard paving thickness adjustment mechanism according to claim 1, characterized in that: The electric push rod is a product that integrates a motor and a ball screw, which can convert the rotational motion of the motor into linear motion and can meet high-precision position control.

3. The segmented medium density fiberboard paving thickness adjustment mechanism according to claim 1, characterized in that: The rotating arm is a metal angle bracket, the corner of the metal angle bracket is hinged to the frame beam, one end of the metal angle bracket is hinged to the corresponding electric push rod, and the other end is hinged to the corresponding movable segmented pressure roller.

4. The segmented medium density fiberboard paving thickness adjustment mechanism according to claim 1, characterized in that: The outer surfaces of all segmented rollers are round smooth rollers without needle teeth, and the outer surface of each segmented roller is made of nylon.

5. The segmented medium density fiberboard paving thickness adjustment mechanism according to claim 1, characterized in that: The linear speed of the contact surface between the roller on each segmented pressure roller and the paving slab is consistent with the speed of the forming belt.

6. The segmented medium density fiberboard paving thickness adjustment mechanism according to claim 1, characterized in that: The fixed segmented pressing roller is rigidly fixed on the frame beam through two fixed arms. The axis position of the fixed segmented pressing roller is relatively fixed with the frame beam and is lifted and pressed down together with the frame beam.

7. The segmented medium density fiberboard paving thickness adjustment mechanism according to claim 1, characterized in that: The fixed segmented pressing roller is arranged at the middle position in the transverse direction of the paving slab.

8. The segmented medium density fiberboard paving thickness adjustment mechanism according to claim 7, characterized in that: All movable segmented pressing rollers are arranged on both sides of the paving slab in the transverse direction.

9. The segmented medium density fiberboard paving thickness adjustment mechanism according to claim 8, characterized in that: The positions and quantities of the movable segmented pressing rollers arranged on both sides of the paving slab are required to be symmetrical and the same.

10. The segmented medium density fiberboard paving thickness adjustment mechanism according to claim 1, characterized in that: Both sets of pressure rollers are arranged in front of the sweeping roller.

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