A pressure system for the upper mold of a wet paper blank hot pressing equipment

Abstract

This utility model discloses an upper mold pressurization system based on a wet paper blank hot pressing equipment, relating to the field of paper forming technology. The utility model includes an upper mold fixing seat, a pneumatic device, a hydraulic device, and several guiding mechanisms. A connecting sleeve is fixed at the midpoint of the top surface of the upper mold fixing seat, and a circular constriction section is integrally connected to the top of the connecting sleeve. The hydraulic device is a hydraulic cylinder, vertically mounted on the top of the upper mold fixing seat and concentric with the connecting sleeve. The piston rod end of the hydraulic device passes through the constriction section and is fixed with a sliding column end. This utility model, through the design of a pressurization system combining pneumatic and hydraulic cylinders, can achieve multi-stage stepped pressurization. Low-pressure venting is achieved through pneumatic cylinder pressurization in the early stage of hot pressing, medium-pressure shaping is performed in the middle stage of hot pressing, and high-pressure compaction is performed in the later stage of hot pressing. Multi-stage pressurization can improve the gradual and dense arrangement of pulp fibers in the wet paper blank, reduce surface burrs, improve paperboard quality, and reduce subsequent polishing and coating costs.

Description

Technical Field

[0001] This utility model belongs to the field of paper forming technology, and in particular relates to an upper mold pressurization system based on a wet paper blank hot pressing equipment. Background Technology

[0002] For the pulp molding process in paper forming technology, pulp (waste paper, sugarcane pulp, etc.) is adsorbed and shaped through a mold, and then dried and hot-pressed to form a product with the characteristics of being biodegradable and suitable for single-use packaging. In the hot-pressing process, the wet paper blank is hot-pressed and shaped through a mold, heating and pressure.

[0003] Current hot pressing equipment uses hydraulic cylinders to pressurize the upper mold. However, the pressure control of hydraulic cylinders is singular, and the constant pressure and high pressure method can directly press the wet paper blank, which can lead to insufficient air and moisture removal. This can easily cause air bubbles, delamination, and cracking, thus affecting the forming quality of the paperboard. Summary of the Invention

[0004] The purpose of this invention is to provide a pressing system for the upper mold of a wet paper blank hot pressing equipment. Through the design of a pressing system with combined cylinder and hydraulic cylinder, multi-stage step-by-step pressing can be achieved. In the early stage of hot pressing, low-pressure exhaust is achieved by cylinder pressing; in the middle stage of hot pressing, medium-pressure shaping is performed; and in the later stage of hot pressing, high-pressure compaction is performed. Multi-stage pressing can improve the gradual and tight arrangement of pulp fibers in the wet paper blank, reduce surface burrs, improve paperboard quality, and reduce subsequent polishing and coating costs.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model is a pressing system for the upper mold based on a wet paper blank hot pressing equipment, including an upper mold fixing seat, a pneumatic device, a hydraulic device and several guiding mechanisms;

[0007] A connecting sleeve is fixed at the midpoint of the top surface of the upper mold fixing seat, and a circular constricted section is integrally connected to the top of the connecting sleeve.

[0008] The hydraulic device is a hydraulic cylinder. The hydraulic device is vertically installed on the top of the upper mold fixing seat and is concentric with the connecting sleeve. The piston rod end of the hydraulic device passes through the constricted section and is fixed with a sliding column end. The sliding column end is slidably installed in the connecting sleeve.

[0009] The pneumatic device consists of several cylinders. The piston rod end of each cylinder is connected to a pressure seat. The cylinders are evenly arranged above the edge of the upper mold fixing seat. The cylinders are arranged vertically with the pressure seat facing downwards. The bottom surface of the pressure seat is movably connected to the top surface of the upper mold fixing seat.

[0010] Several of the aforementioned guiding mechanisms are evenly arranged above the edge of the upper mold fixing seat and are offset from the positions of several cylinders. Each guiding mechanism includes a long guide sleeve and a long guide post. The long guide post is fixed on the top surface of the upper mold fixing seat, and the other end of the long guide post is slidably arranged inside the long guide sleeve.

[0011] Furthermore, it also includes a hot press upper frame, on which the hydraulic device, cylinder and long guide sleeve are all fixed.

[0012] Furthermore, the long guide sleeve is provided with a mounting seat at the end away from the long guide post, and a number of reinforcing ribs are provided between the mounting seat and the side wall of the long guide sleeve.

[0013] Furthermore, one end of the connecting sleeve is integrally connected to a flared seat, and the flared seat of the connecting sleeve is fixed on the upper mold fixing seat.

[0014] Furthermore, the connecting sleeve has a constant pressure groove on its peripheral side, with the top and bottom of the constant pressure groove extending to the constriction section and the flaring seat, respectively.

[0015] Furthermore, the outer diameter of the piston rod of the hydraulic device is the same as the inner diameter of the constricted section, the outer diameter of the sliding column end is the same as the inner diameter of the connecting sleeve, and the inner diameter of the constricted section is smaller than the inner diameter of the connecting sleeve.

[0016] This utility model has the following beneficial effects:

[0017] 1. This utility model uses a pressurization system with a combination of pneumatic and hydraulic cylinders to achieve multi-stage step pressurization. In the early stage of hot pressing, low-pressure exhaust is achieved through pneumatic cylinder pressurization; in the middle stage of hot pressing, medium-pressure shaping is performed; and in the later stage of hot pressing, high-pressure compaction is performed. Multi-stage pressurization can improve the gradual and tight arrangement of pulp fibers in the wet paper blank, reduce surface burrs, improve paperboard quality, and reduce subsequent polishing and coating costs.

[0018] 2. This utility model uses a cylinder to apply pressure during the pre-pressing stage of hot pressing. The high-speed response of the cylinder can shorten the cycle time and facilitate pressure control, ensuring light pressure during the pre-pressing stage, satisfying the initial soft state of the wet paper blank, and ensuring gas discharge. At the same time, the design of the connecting sleeve ensures that the cylinder pressurization and the hydraulic device pressurization do not interfere with each other, avoiding mechanical interference between the cylinder and the hydraulic cylinder, and ensuring service life and stability.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the upper mold pressing system based on a wet paper blank hot pressing equipment according to this utility model;

[0022] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1-Upper mold fixing seat, 2-Hydraulic device, 3-Guide mechanism, 4-Connecting sleeve, 5-Cylinder, 201-Sliding column end, 301-Long guide sleeve, 302-Long guide column, 303-Mounting seat, 304-Reinforcing rib, 401-Narrowing section, 402-Flanging seat, 403-Constant pressure groove. Detailed Implementation

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

[0026] Please see Figure 1-2 As shown, this utility model is an upper mold pressurization system based on a wet paper blank hot pressing equipment, including an upper mold fixing seat 1, a pneumatic device, a hydraulic device 2, and several guide mechanisms 3;

[0027] A connecting sleeve 4 is fixed at the midpoint of the top surface of the upper mold fixing base 1, and a circular constriction section 401 is integrally connected to the top of the connecting sleeve 4.

[0028] The hydraulic device 2 is a hydraulic cylinder. The hydraulic device 2 is vertically installed on the top of the upper mold fixing seat 1 and is concentric with the connecting sleeve 4. The piston rod end of the hydraulic device 2 passes through the constricted section 401 and is fixed with a sliding column end 201. The sliding column end 201 is slidably installed in the connecting sleeve 4.

[0029] The pneumatic device consists of several cylinders 5. The piston rod end of the cylinder 5 is connected to a pressure seat. Several cylinders 5 are evenly arranged above the edge of the upper mold fixing seat 1. The cylinders 5 are arranged vertically with the pressure seat facing down. The bottom surface of the pressure seat is movably connected to the top surface of the upper mold fixing seat 1.

[0030] Several guide mechanisms 3 are evenly arranged above the edge of the upper mold fixing seat 1 and are offset from the positions of several cylinders 5. The guide mechanism 3 includes a long guide sleeve 301 and a long guide post 302. The long guide post 302 is fixed on the top surface of the upper mold fixing seat 1, and the other end of the long guide post 302 is slidably arranged in the long guide sleeve 301.

[0031] It also includes a hot press upper frame, and the hydraulic device 2, cylinder 5 and long guide sleeve 301 are all fixed on the hot press upper frame.

[0032] Among them, such as Figure 1-2 As shown, the long guide sleeve 301 has a mounting base 303 at the end away from the long guide post 302, and a number of reinforcing ribs 304 are provided between the mounting base 303 and the side wall of the long guide sleeve 301.

[0033] Among them, such as Figure 1-2 As shown, one end of the connecting sleeve 4 is integrally connected to a flared seat 402, and the flared seat 402 of the connecting sleeve 4 is fixed on the upper mold fixing seat 1.

[0034] Among them, such as Figure 1-2 As shown, the connecting sleeve has a constant pressure groove 403 on its four sides, and the top and bottom of the constant pressure groove 403 extend to the constriction section 401 and the flaring seat 402, respectively.

[0035] Among them, such as Figure 2 As shown, the outer diameter of the piston rod of the hydraulic device 2 is the same as the inner diameter of the constricted section 401, the outer diameter of the sliding column end 201 is the same as the inner diameter of the connecting sleeve 4, and the inner diameter of the constricted section 401 is smaller than the inner diameter of the connecting sleeve 4.

[0036] The working principle of this utility model is as follows:

[0037] In the initial state, the hydraulic device 2 is in the retracted state, and the constricted section 401 of the connecting sleeve 4 is tightly attached to the top of the sliding column end 201 by gravity. The cylinder 5 is in the shortest retracted state, and there is a gap between the pressure seat of the cylinder 5 and the top surface of the upper mold fixing seat 1.

[0038] The suppression process consists of three steps:

[0039] The first step involves controlling the hydraulic device 2 to extend until the upper die fixing seat 1 rests on the top surface of the wet paper blank. It then extends further, ensuring the narrowing section 401 is within the connecting sleeve 4 and does not contact the flaring seat 402. All cylinders 5 are then extended to press the upper die fixing seat 1, providing low pressure through the cylinders 5. The hydraulic device 2 does not participate in the pressing process. Figure 2 As shown;

[0040] The second step involves controlling the hydraulic device 2 to extend and press the flared seat 402 to provide medium pressure to the upper mold fixing seat 1. The pressing seat of the cylinder 5 is movably connected to the upper mold fixing seat 1 and does not participate in the pressing.

[0041] The third step is to pressurize the hydraulic device 2 to provide high pressure.

[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A pressing system for an upper mold based on a wet paper blank hot pressing equipment, characterized in that: It includes an upper mold fixing seat (1), a pneumatic device, a hydraulic device (2), and several guiding mechanisms (3); A connecting sleeve (4) is fixed at the midpoint of the top surface of the upper mold fixing seat (1), and a circular constriction section (401) is integrally connected to the top of the connecting sleeve (4). The hydraulic device (2) is a hydraulic cylinder. The hydraulic device (2) is vertically installed on the top of the upper mold fixing seat (1) and concentric with the connecting sleeve (4). The piston rod end of the hydraulic device (2) passes through the constricted section (401) and is fixed with a sliding column end (201). The sliding column end (201) is slidably installed in the connecting sleeve (4). The pneumatic device consists of several cylinders (5). The piston rod end of the cylinder (5) is connected to a pressure seat. Several cylinders (5) are evenly arranged above the edge of the upper mold fixing seat (1). The cylinders (5) are arranged vertically with the pressure seat facing down. The bottom surface of the pressure seat is movably connected to the top surface of the upper mold fixing seat (1). Several of the guide mechanisms (3) are evenly arranged above the edge of the upper mold fixing seat (1) and are offset from the positions of several cylinders (5). The guide mechanism (3) includes a long guide sleeve (301) and a long guide post (302). The long guide post (302) is fixed on the top surface of the upper mold fixing seat (1), and the other end of the long guide post (302) is slidably arranged in the long guide sleeve (301).

2. The upper mold pressing system based on a wet paper blank hot pressing equipment according to claim 1, characterized in that, It also includes a hot press upper frame, on which the hydraulic device (2), cylinder (5) and long guide sleeve (301) are all fixed.

3. The upper die pressing system based on a wet paper blank hot pressing equipment according to claim 1, characterized in that, The long guide sleeve (301) is provided with a mounting base (303) at the end away from the long guide post (302), and a number of reinforcing ribs (304) are provided between the mounting base (303) and the side wall of the long guide sleeve (301).

4. The upper die pressing system based on a wet paper blank hot pressing equipment according to claim 1, characterized in that, One end of the connecting sleeve (4) is integrally connected to a flared seat (402), and the flared seat (402) of the connecting sleeve (4) is fixed on the upper mold fixing seat (1).

5. The upper die pressing system based on a wet paper blank hot pressing equipment according to claim 4, characterized in that, The connecting sleeve (4) has a constant pressure groove (403) on its circumferential side. The top and bottom of the constant pressure groove (403) extend to the constriction section (401) and the flaring seat (402), respectively.

6. The upper die pressing system based on a wet paper blank hot pressing equipment according to claim 1, characterized in that, The outer diameter of the piston rod of the hydraulic device (2) is consistent with the inner diameter of the constricted section (401), the outer diameter of the sliding column end (201) is consistent with the inner diameter of the connecting sleeve (4), and the inner diameter of the constricted section (401) is smaller than the inner diameter of the connecting sleeve (4).

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