Gradient pressure multi-stage hot pressing device for production of high-thickness grey paperboards

Abstract

The invention provides a gradient pressure multi-stage hot pressing device for production of high-thickness grey paperboards, and relates to the technical field of production of grey paperboards. The two sides of the upper end face of the equipment base are each provided with one extrusion assembly, the two extrusion assemblies are each provided with a limiting assembly and a vibration assembly, and a conveying assembly is arranged in the center of the upper end face of the equipment base. The pressure and the heating temperature of the two extrusion assemblies are adjusted through the control box, gradient pressure multi-stage hot pressing is achieved, moisture and heat of a grey paperboard are smoothly discharged from inside to outside, and faults caused by rapid dehydration shrinkage are avoided; the vibration assembly is matched with the vibrator, automatic demolding of the grey paperboard is achieved, and manual intervention is not needed; the auxiliary assembly assists in conveying the grey paperboards, the conveying assembly achieves continuous and automatic conveying, and the production efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grey board production, and particularly relates to a gradient pressure multi-stage hot pressing device for high-thickness grey board production. BACKGROUND

[0002] The high-thickness grey board is an industrial paper board made of waste paper and semi-bleached pulp as main raw materials through a cylinder paper machine papermaking process; in the production process of the high-thickness grey board, the hot pressing process is a key link determining the product quality.

[0003] The existing device adopts single pressure and temperature for processing, which causes the internal moisture and heat of the grey board to be unable to be quickly and evenly dissipated, and problems such as uneven dehydration shrinkage, internal fault, and surface wrinkling are prone to occur; the grey board is prone to be adhered to the heating block after hot pressing, manual demolding is required, the labor intensity is large, and the production efficiency is low. SUMMARY

[0004] The present application relates to a gradient pressure multi-stage hot pressing device for high-thickness grey board production, which solves the problems of fault, demolding difficulty and inconvenient maintenance of the heating block in the process of processing the high-thickness grey board by the traditional hot pressing device.

[0005] The present application provides a gradient pressure multi-stage hot pressing device for high-thickness grey board production, which specifically comprises: a device base; the device base is placed on the ground, a frame body is fixed on the left side of the upper end face of the device base, a clamping groove is formed in the frame body, a connecting block is clamped in the clamping groove, a first heating block is fixed on the connecting block, a locking screw for fixing the connecting block is threadedly connected to the frame body, when the first heating block is installed, the connecting block is directly clamped into the clamping groove on the frame body, and then it is fixed through the locking screw, thereby improving the dismounting efficiency of the first heating block; a base block is slidably arranged on the frame body, a second heating block is installed on the bottom end face of the base block, two hydraulic cylinders are symmetrically fixed on the frame body, and the extending ends of the two hydraulic cylinders are fixed on the base block.

[0006] Further, a collecting frame is fixed on the frame body, the collecting frame has a back-shaped structure, and one drain pipe is welded to the collecting frame.

[0007] Further, the second heating block is clamped on the base block, and a fixing screw for fixing the second heating block is threadedly connected to the base block.

[0008] Further, the frame body, the first heating block, the connecting block, the locking screw, the base block, the second heating block, the fixing screw, the hydraulic cylinders, the collecting frame and the drain pipe jointly form an extrusion assembly, a limiting assembly is installed on the base block, the limiting assembly comprises a connecting rod, a limiting block and a limiting nut, the connecting rod is fixed on the upper end face of the base block, and the connecting rod penetrates through the frame body.

[0009] Further, the connecting rod is inserted with a limiting block, two limiting nuts for positioning the limiting block on the connecting rod are threadedly connected on the connecting rod, the limiting block is of a concave structure, the limiting block is located above the frame body, and the limiting block is a limiting piece for the downward movement of the second heating block.

[0010] Further, the frame body is provided with a vibration assembly, the vibration assembly is composed of force blocks, grooves and clamping rods, two force blocks are symmetrically welded on the frame body, the two force blocks are both of rectangular block structures, grooves are equidistantly formed on the outer sides of each force block, the grooves are semicylindrical groove structures, two clamping rods are symmetrically welded on the left and right end faces of the base block, the two clamping rods on the left are clamped in the groove on the left, the two clamping rods on the right are clamped in the two grooves on the right, and the clamping rods and the grooves are in a continuous elastic clamping state when the base block moves downward.

[0011] Further, two vibrators are symmetrically mounted on the frame body, the two vibrators are electrically connected with an external power supply, and the two vibrators are vibration demolding pieces of gray paperboard.

[0012] Further, a conveying assembly is mounted on the center position of the upper end face of the equipment base, the conveying assembly is composed of a conveying frame, conveying rollers, first gears, second gears and a motor, the conveying frame is fixed on the center position of the upper end face of the equipment base, the conveying rollers are equidistantly rotatable on the conveying frame, a first gear is fixed on the rotating shaft of each conveying roller, second gears are equidistantly rotatable on the conveying frame, adjacent two first gears are meshed through the second gears, and the motor is fixed on the conveying frame and the output shaft of the motor is fixed on the rotating shaft of the rightmost conveying roller.

[0013] Further, a pressing assembly is also mounted on the right side position of the upper end face of the equipment base, and the pressing assembly is also provided with a limiting assembly and a vibration assembly.

[0014] Further, an auxiliary assembly is mounted on the left side position of the upper end face of the equipment base and located to the left of the left pressing assembly, the auxiliary assembly is composed of a mounting frame, an air jet pipe, a connecting pipe and a nozzle, the mounting frame is fixed on the upper end face of the equipment base, the air jet pipe is fixed on the mounting frame, the connecting pipe is connected with the air jet pipe, the connecting pipe is connected with an external air supply pump, the nozzle is equidistantly fixed on the air jet pipe, and the nozzle is diagonally aligned with the second heating block.

[0015] Further, a control box is mounted on the upper end face of the equipment base, a controller for pressure control of the hydraulic cylinder is mounted in the control box, and controllers for temperature control of the two first heating blocks and the two second heating blocks are also mounted in the control box.

[0016] The application provides a gradient pressure multi-stage hot pressing device for high-thickness gray paperboard production, and has the following beneficial effects: Compared with traditional hot pressing processes, this application uses a gradient pressure design to gradually transition the pressure from gentle pressure in the initial stage to precise pressure in the forming stage. At the same time, it is combined with multi-level temperature regulation to allow the heat released by the heating block to penetrate evenly into the interior of the gray cardboard. This solves the quality defects such as internal breakage and delamination of gray cardboard, and surface wrinkling and warping.

[0017] This application utilizes the elastic snap-fit ​​structure of the snap-fit ​​rod and the groove to generate high-frequency vibration during operation. Simultaneously, the enhanced vibration effect of the dedicated vibrator forms a synergistic vibration force, which can quickly break the adhesion between the gray cardboard and the heating block, achieving automatic demolding and separation of the two without the need for manual peeling. It also avoids problems such as product scratches and deformation that may be caused by manual operation.

[0018] This application utilizes a high-pressure nozzle to spray a uniform airflow, providing flexible support and guidance for the gray cardboard. Combined with the synchronous transmission mechanism of the conveying components, it constructs a fully continuous automated production line from raw material feeding and gradient hot pressing to finished product output. This automated process significantly shortens the connection time between each process and improves efficiency.

[0019] The first heating block of this application is connected to the frame by a snap-fit ​​mechanism and is quickly fixed by screws. The second heating block is also connected to the base block by a snap-fit ​​mechanism and is fastened by screws. The improvement makes the assembly and disassembly of the heating blocks simple and efficient, without the need for complicated tools.

[0020] This application releases a certain amount of moisture when extruding gray cardboard. This application has specially designed a U-shaped collection frame that precisely covers the hot pressing work area and can fully collect the discharged moisture. The collected moisture is then discharged to a designated treatment device through a special drain pipe, which avoids problems such as damp processing table, equipment corrosion and production environment pollution caused by water flowing randomly. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0022] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0023] In the attached diagram: Figure 1 A perspective view of the gradient pressure multi-stage hot pressing apparatus of the present invention for the production of high-thickness grey cardboard is shown; Figure 2 A front view of the gradient pressure multi-stage hot pressing apparatus of the present invention for the production of high-thickness grey cardboard is shown. Figure 3 The present invention is shown. Figure 1 Rotated 3D image; Figure 4 A perspective view of the extrusion assembly, limiting assembly, and vibration assembly of the present invention is shown; Figure 5 The present invention is shown. Figure 4 The disassembled 3D image; Figure 6 The present invention is shown. Figure 4 Rotated 3D image; Figure 7 The present invention is shown. Figure 6 Enlarged view of point A; Figure 8 A perspective view of the conveying assembly of the present invention is shown; Figure 9 A perspective view of the auxiliary component of the present invention is shown.

[0024] Figure label: 1. Equipment base; 2. Extrusion assembly; 201. Frame; 202. First heating block; 203. Connecting block; 204. Locking screw; 205. Base block; 206. Second heating block; 207. Fixing screw; 208. Hydraulic cylinder; 209. Collection frame; 210. Drain pipe; 3. Limiting assembly; 301. Connecting rod; 302. Limiting block; 303. Limiting nut; 4. Vibration assembly; 401. Force-bearing block; 402. Groove; 403. Snap-fit ​​rod; 5. Vibrator; 6. Conveying assembly; 601. Conveying frame; 602. Conveying roller; 603. First gear; 604. Second gear; 605. Motor; 7. Auxiliary assembly; 701. Mounting frame; 702. Air jet pipe; 703. Connecting pipe; 704. Nozzle; 8. Control box. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Unless otherwise defined, all terms (including technical and scientific terms) used in embodiments of this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in a common dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as being interpreted in an idealized or highly formalized sense, unless expressly defined in this embodiment of the invention.

[0027] The terms "first," "second," and similar words used in the embodiments of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. Likewise, the terms "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. In the following description, spatial and directional terms such as "upper," "lower," "front," "rear," "top," "bottom," "vertical," and "horizontal" may be used to describe embodiments of the invention; however, it should be understood that these terms are only for the convenience of describing the embodiments shown in the figures and do not require the actual device to be constructed or operated in a specific orientation. In the following description, the use of terms such as "connect," "link," "fix," and "attach" can refer to a direct connection between two elements or structures without other elements or structures, or to an indirect connection between two elements or structures through an intermediate element or structure, unless otherwise expressly stated herein.

[0028] Example 1: Please refer to Figures 1-9 : This invention proposes a gradient pressure multi-stage hot pressing device for the production of high-thickness grey cardboard, comprising: a base 1; the base 1 is placed on the ground, and a frame 201 is fixed to the left side of the upper end face of the base 1. The frame 201 has a snap-fit ​​groove, in which a connecting block 203 is snapped. A first heating block 202 is fixed to the connecting block 203. The frame 201 is threadedly connected to a locking screw 204 for fixing the connecting block 203. When installing the first heating block 202, the connecting block 203 is directly snapped into the snap-fit ​​groove on the frame 201. Then it can be fixed by locking screw 204, which improves the disassembly and assembly efficiency of the first heating block 202; a base block 205 slides on the frame 201, and a second heating block 206 is installed on the bottom surface of the base block 205. Two hydraulic cylinders 208 are symmetrically fixed on the frame 201, and the protruding ends of the two hydraulic cylinders 208 are fixed on the base block 205. During hot pressing, the gray cardboard is placed on the first heating block 202, and the two hydraulic cylinders 208 are driven to extend. The two hydraulic cylinders 208 drive the base block 205 and the second heating block 206 to move downward to complete the hot pressing of the gray cardboard.

[0029] The frame 201 is fixed with a collection frame 209, which has a U-shaped structure. A drain pipe 210 is welded to the collection frame 209. During the hot pressing process, the moisture discharged from the gray cardboard is collected by the collection frame 209 and then discharged through the drain pipe 210, ensuring the cleanliness of the processing.

[0030] The second heating block 206 is snapped onto the base block 205. The base block 205 is threaded with a fixing screw 207 for fixing the second heating block 206. When disassembling the second heating block 206, the fixing screw 207 is loosened and the second heating block 206 is pulled forward, which improves the disassembly and assembly efficiency of the second heating block 206 and thus improves the maintenance efficiency of the second heating block 206.

[0031] The frame 201, the first heating block 202, the connecting block 203, the locking screw 204, the base block 205, the second heating block 206, the fixing screw 207, the hydraulic cylinder 208, the collection frame 209, and the drain pipe 210 together form the extrusion assembly 2. The base block 205 is equipped with a limit assembly 3, which consists of a connecting rod 301, a limit block 302, and a limit nut 303. The connecting rod 301 is fixed on the upper end face of the base block 205 and passes through the frame 201.

[0032] The connecting rod 301 is fitted with a limiting block 302. Two limiting nuts 303 are threaded onto the connecting rod 301 to position the limiting block 302 on the connecting rod 301. The limiting block 302 has a concave structure and is located above the frame 201. The limiting block 302 is a limiting component for the downward movement of the second heating block 206. During use, the limiting block 302 can prevent the second heating block 206 from moving too far downward, which could damage the gray cardboard.

[0033] The frame 201 is equipped with a vibration assembly 4, which consists of a force-bearing block 401, a groove 402, and a locking rod 403. Two force-bearing blocks 401 are symmetrically welded on the frame 201. Both force-bearing blocks 401 are rectangular block structures. Grooves 402 are equally spaced on the outer side of each force-bearing block 401. The grooves 402 are semi-cylindrical groove structures. Two locking rods 403 are symmetrically welded on the left and right ends of the base block 205. The two locking rods 403 on the left are locked in the grooves 402 on the left, and the two locking rods 403 on the right are locked in the grooves 402 on the right. When the base block 205 moves downward, the locking rods 403 and the grooves 402 are in a continuous elastic locking state. Vibration can be generated through the locking of the locking rods 403 and the grooves 402. This vibration is transmitted to the second heating block 206, which better realizes the separation of the gray cardboard from the second heating block 206 after extrusion, without the need for manual separation.

[0034] Two vibrators 5 are symmetrically installed on the frame 201. Both vibrators 5 are electrically connected to an external power supply. The two vibrators 5 are vibration demolding components for gray cardboard. When the power supply to the two vibrators 5 is turned on, the vibration generated by the two vibrators 5 can be transmitted to the second heating block 206, which facilitates the gray cardboard to be separated from the second heating block 206.

[0035] The equipment base 1 has a conveying assembly 6 installed at the center of its upper surface. The conveying assembly 6 consists of a conveying frame 601, conveying rollers 602, a first gear 603, a second gear 604, and a motor 605. The conveying frame 601 is fixed at the center of the upper surface of the equipment base 1. Conveying rollers 602 rotate at equal intervals on the conveying frame 601. A first gear 603 is fixed on the rotating shaft of each conveying roller 602. A second gear 604 rotates at equal intervals on the conveying frame 601. Two adjacent first gears 603 mesh with the second gear 604. A motor 605 is fixed on the conveying frame 601. The output shaft of the motor 605 is fixed on the rotating shaft of the rightmost conveying roller 602. When conveying gray cardboard, the motor 605 is started. Under the meshing transmission of the first gear 603 and the second gear 604, the synchronous rotation of all conveying rollers 602 is realized, thus realizing the rightward conveying of gray cardboard.

[0036] Among them, an extrusion component 2 is also installed on the right side of the upper end face of the equipment base 1. The extrusion component 2 is also equipped with a limit component 3 and a vibration component 4. By adjusting the pressure value of the two extrusion components 2, gradient pressure multi-stage hot pressing can be achieved. Through gradient multi-stage hot pressing, moisture and heat are slowly discharged from the inside to the outside, avoiding the fracture caused by rapid dehydration and shrinkage.

[0037] An auxiliary component 7 is installed on the upper surface of the equipment base 1, located to the left of the left extrusion component 2. The auxiliary component 7 consists of a mounting frame 701, an air jet pipe 702, a connecting pipe 703, and a nozzle 704. The mounting frame 701 is fixed to the upper surface of the equipment base 1. The air jet pipe 702 is fixed on the mounting frame 701. The connecting pipe 703 is connected to the air jet pipe 702 and is connected to an external air supply pump. Nozzles 704 are fixed at equal intervals on the air jet pipe 702. The nozzles 704 are obliquely aligned with the second heating block 206. When the external air supply pump is started, gas is ejected through the nozzles 704. The gas ejected from the nozzles 704 comes into contact with the gray paperboard on the second heating block 206, enabling the gray paperboard to be conveyed to the right. Finally, the gray paperboard is blown onto the conveying roller 602 for conveying.

[0038] Example 2, based on Example 1, such as Figures 1-9 As shown, a control box 8 is installed on the upper surface of the equipment base 1. The control box 8 contains a controller for controlling the pressure of the hydraulic cylinder 208, and also contains a controller for controlling the temperature of the two first heating blocks 202 and the two second heating blocks 206. By controlling different pressures and different temperatures, gradient pressure multi-stage hot pressing can be achieved.

[0039] The working principle of this embodiment is as follows: The operator presets parameters through the control box 8 equipped with the equipment, precisely setting the pressure values ​​of the two sets of extrusion components 2 and the temperature values ​​of the first heating block 202 and the second heating block 206. The left extrusion component 2 is set to the primary gradient parameters, and the right extrusion component 2 is set to the secondary gradient parameters. After the parameters are set, the high-thickness gray cardboard to be processed is placed stably on the first heating block 202 of the left extrusion component 2. Then, the left hydraulic cylinder 208 is activated. Driven by the hydraulic system, the hydraulic cylinder 208 slowly extends, thereby driving the base block 205 connected to the piston rod and the base fixed to the base. The second heating block 206 below block 205 moves downward at a constant speed; when it reaches the predetermined extension position, the hydraulic cylinder 208 stops extending. At this time, the second heating block 206 cooperates with the first heating block 202 to apply a preset primary gradient pressure to the gray cardboard and heat it, entering the primary hot pressing stage; during the primary hot pressing process, the moisture inside the gray cardboard is rapidly vaporized and discharged due to the high temperature. The discharged moisture is collected by the collection frame 209 located below the first heating block 202. The collected moisture is discharged in a directional manner through the drain pipe 210 connected to the bottom of the collection frame 209 to avoid moisture residue affecting the operation of the equipment or the quality of the cardboard. After the initial hot pressing reaches the preset time, the control box 8 issues a reset command, the hydraulic cylinder 208 retracts, and drives the base block 205 and the second heating block 206 to move upward to the initial position. At the same time, the power supply of the vibrator 5 is automatically turned on, and the vibrator 5 generates high-frequency vibration, which works in synergy with the vibration component 4 equipped with the equipment. The vibration reduces the adhesion between the gray cardboard and the surface of the heating block. During this process, the locking rod 403 of the vibration component 4 and the groove 402 continuously and elastically engage and disengage, further generating high-frequency vibration. The dual vibration mechanism works together to achieve efficient and non-destructive demolding of the gray cardboard, avoiding the cardboard damage that may be caused by manual demolding. The external air pump is started, and gas is delivered to the preset nozzle 704 through the air pipeline. The nozzle 704 sprays air at a reasonable angle and pressure. The sprayed gas directly contacts the surface of the demolded gray cardboard on the second heating block 206. The thrust of the airflow realizes the rightward directional conveying of the gray cardboard, ensuring that the gray cardboard is blown smoothly and accurately onto the conveying roller 602 of the conveying component 6. The conveying roller 602 rotates under the drive of the motor 605, continuously conveying the gray cardboard after preliminary compression to the processing area of ​​the right extrusion component 2. After the gray cardboard reaches the right extrusion component 2, the right extrusion component 2 repeats the hot pressing process of the left extrusion component 2 according to the preset secondary gradient pressure and temperature parameters. This includes operations such as closing and pressurizing the heating block, collecting and discharging moisture, resetting the hydraulic cylinder 208, and vibration demolding. Through the high pressure and high temperature treatment of the secondary gradient, the internal structure of the gray cardboard is further compacted, and the density, hardness and flatness of the cardboard are improved, completing the core processing link of multi-stage hot pressing. Finally, the extruded gray cardboard can be removed.

[0040] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. The scope of protection of this disclosure shall be determined by the scope of the claims.

Claims

1. A gradient pressure multi-stage hot press apparatus for high-basis weight manila board production, characterized by, Include: The device base (1); the device base (1) is placed on the ground, the upper end face of the device base (1) is fixed with the frame body (201), the frame body (201) is provided with a clamping groove, the clamping groove is clamped with the connecting block (203), the connecting block (203) is fixed with the first heating block (202), the frame body (201) is threadedly connected with the locking screw (204) for fixing the connecting block (203); the frame body (201) is slidably provided with the base block (205), the base block (205) is provided with the second heating block (206) on the bottom end face, the frame body (201) is symmetrically provided with two hydraulic cylinders (208), and the extending ends of the two hydraulic cylinders (208) are fixed on the base block (205); the frame body (201) is fixed with the collecting frame (209), the collecting frame (209) is a back-shaped structure, and the collecting frame (209) is welded with a drain pipe (210).

2. A gradient pressure multi-stage press device for high-basis weight manila board production according to claim 1, characterized in that, The second heating block (206) is clamped on the base block (205), and a fixing screw (207) for fixing the second heating block (206) is threadedly connected on the base block (205).

3. A gradient pressure multistage press device for high thickness manila board production according to claim 2, characterized in that, The frame body (201), the first heating block (202), the connecting block (203), the locking screw (204), the base block (205), the second heating block (206), the fixing screw (207), the hydraulic cylinder (208), the collecting frame (209) and the drain pipe (210) jointly form an extrusion assembly (2), a limiting assembly (3) is installed on the base block (205), the limiting assembly (3) is composed of a connecting rod (301), a limiting block (302) and a limiting nut (303), the connecting rod (301) is fixed on the upper end face of the base block (205), and the connecting rod (301) penetrates through the frame body (201).

4. A gradient pressure multistage press device for high thickness manila board production according to claim 3, characterized in that, The connecting rod (301) is inserted with the limiting block (302), and the connecting rod (301) is threadedly connected with two limiting nuts (303) for positioning the limiting block (302) on the connecting rod (301), the limiting block (302) is a concave structure, the limiting block (302) is located above the frame body (201), and the limiting block (302) is a limiting piece for the downward movement of the second heating block (206).

5. A gradient pressure multistage press device for high thickness manila board production according to claim 4, characterized in that, The frame body (201) is provided with a vibration assembly (4), the vibration assembly (4) is composed of a stress block (401), a groove (402) and a clamping rod (403), two stress blocks (401) are symmetrically welded on the frame body (201), the two stress blocks (401) are both rectangular block structures, and grooves (402) are equally arranged on the outer sides of each stress block (401); the grooves (402) are semicylindrical groove structures, two clamping rods (403) are symmetrically welded on the left end face and the right end face of the base block (205), the left two clamping rods (403) are clamped in the left groove (402), the right two clamping rods (403) are clamped in the right two grooves (402), and when the base block (205) moves downward, the clamping rod (403) and the groove (402) are in a continuous elastic clamping state.

6. A gradient pressure multistage press device for high-bulkiness grey board production according to claim 5, characterized in that, Two vibrators (5) are symmetrically installed on the frame body (201), and the two vibrators (5) are electrically connected with an external power supply, and the two vibrators (5) are vibration demolding elements of gray board.

7. A gradient pressure multistage press device for high-bulkiness grey board production according to claim 6, characterized in that, A conveying assembly (6) is installed at the center position of the upper end face of the equipment base (1), and the conveying assembly (6) is composed of a conveying frame (601), conveying rollers (602), first gears (603), second gears (604) and a motor (605). The conveying frame (601) is fixed at the center position of the upper end face of the equipment base (1), and the conveying rollers (602) are rotatably arranged on the conveying frame (601) at equal intervals. Each conveying roller (602) is fixed with a first gear (603) on the rotating shaft. The second gears (604) are rotatably arranged on the conveying frame (601) at equal intervals. Adjacent two first gears (603) are engaged through the second gears (604). The motor (605) is fixed on the conveying frame (601), and the output shaft of the motor (605) is fixed on the rotating shaft of the rightmost conveying roller (602).

8. A gradient pressure multistage press device for high-bulkiness grey board production according to claim 7, characterized in that, The equipment base (1) is also provided with an extrusion assembly (2) at the right side of the upper end face, and the extrusion assembly (2) is also provided with a limiting assembly (3) and a vibration assembly (4).

9. A gradient pressure multistage press device for high-bulkiness grey board production according to claim 8, characterized in that, An auxiliary assembly (7) is installed at the left side of the upper end face of the equipment base (1) and left of the left extrusion assembly (2). The auxiliary assembly (7) is composed of a mounting frame (701), a jet pipe (702), a connecting pipe (703) and a nozzle (704). The mounting frame (701) is fixed on the upper end face of the equipment base (1). The jet pipe (702) is fixed on the mounting frame (701). The connecting pipe (703) is connected to the jet pipe (702). The connecting pipe (703) is connected to an external gas supply pump. The nozzle (704) is fixed on the jet pipe (702) at equal intervals. The nozzle (704) is diagonally aligned with the second heating block (206).

10. A gradient pressure multistage press device for high thickness manila board production according to claim 9, characterized in that, A control box (8) is installed on the upper end face of the equipment base (1). A controller for pressure control of the hydraulic cylinder (208) is installed in the control box (8). Controllers for temperature control of the two first heating blocks (202) and the two second heating blocks (206) are also installed in the control box (8).

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