A couch roll press device

Abstract

This utility model discloses a flat roll pressing device, characterized in that it further includes a pressure roll that works with the flat roll to squeeze the moisture in the paper web and whose distance between the two can be adjusted; an adjusting device for adjusting the distance between the flat roll and the pressure roll; several rollers installed on the production line; and a felt belt wrapped around the outer circumference of the pressure roll and the rollers to absorb water seeping out of the paper web during the pressing process. This utility model, by setting pressure rolls distributed corresponding to the flat roll above and below, forms a highly efficient mechanical pressing zone, which can apply uniform and stable squeezing force to the paper web, forcefully squeezing out the moisture between the paper web fibers, laying the foundation for the dewatering process. Simultaneously, the specially added felt belt closely adheres to the surface of the pressure roll and operates synchronously, immediately absorbing the free water that has been squeezed out but not yet drained, forming a physical barrier layer, fundamentally preventing water from seeping back into the paper web, thereby significantly improving the overall dewatering efficiency and dewatering rate, and reducing the burden on subsequent drying processes.

Description

Technical Field

[0001] This utility model relates to the technical field of paper web production equipment, specifically a flat roller pressing device. Background Technology

[0002] In the paper web production process, the pressing process is a crucial step in removing moisture from the paper web, and its dewatering effect directly affects the drying efficiency, physical properties, and energy consumption of the paper web. Currently, traditional flat roll pressing devices mostly adopt a fixed-gap roll structure, which makes it difficult to flexibly adjust the pressure and spacing between the rolls according to different paper web thicknesses, basis weights, and dewatering requirements. This easily leads to uneven pressing of the paper web and excessive moisture residue. At the same time, traditional devices have low efficiency in collecting and absorbing moisture that seeps out during the pressing process. Some moisture easily adheres to the surface of the rolls or conveyor components, which not only affects the normal operation of subsequent processes but may also cause quality defects such as wrinkles and damage to the paper web. Therefore, a flat roll pressing device is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a flat roller pressing device to solve the above problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a flat roll pressing device, comprising a flat roll installed on a production line, characterized in that: it further comprises a pressure roll distributed vertically and vertically corresponding to the flat roll for cooperating in squeezing moisture from the paper web and adjusting the distance between the two; an adjusting device for adjusting the distance between the flat roll and the pressure roll; a plurality of rollers installed on the production line; and a felt belt wrapped around the outer circumference of the pressure roll and the plurality of rollers for absorbing water seeping from the paper web during the pressing process; the adjusting device comprises a first bracket, a hydraulic cylinder connected to the first bracket, a second bracket connected to the first bracket and located away from the cylinder body of the hydraulic cylinder, and a lever arm connected to the output end of the hydraulic cylinder and rotatably connected to the second bracket for fixing the pressure roll.

[0005] Preferably, the lower part of the roll is provided with several water collection tanks for collecting the water squeezed out from the paper web.

[0006] Preferably, a vacuum pump connected to a water collection tank is provided below the roller and on the outer periphery of the felt belt.

[0007] The beneficial effects of this utility model are as follows: By setting pressure rollers that are distributed above and below the flat roller, the two form a highly efficient mechanical pressing zone, which can apply uniform and stable squeezing force to the paper web and forcefully squeeze out the water between the paper web fibers, laying the foundation for the dewatering process; at the same time, the specially added felt belt is closely attached to the surface of the pressure roller and operates synchronously, which can immediately absorb the free water that has been squeezed out but has not been discharged in time, forming a physical barrier layer, fundamentally preventing water from seeping back into the paper web, thereby greatly improving the overall dewatering efficiency and dewatering rate, and reducing the burden on the subsequent drying process; By equipping an adjustment device, the linear driving force of the hydraulic cylinder drives the power arm to rotate around the hinge point of the second bracket, thereby achieving precise adjustment of the distance between the pressure roller and the flat roller. The pressing pressure can be flexibly adjusted according to the production needs of different paper types, ensuring uniform pressure across the entire paper web, effectively reducing local moisture residue, and improving the stability of paper web forming quality. By employing a synergistic structure of felt belt, water collection tank, and dual vacuum pumps, a multi-layered moisture collection and adsorption system is constructed: the water collection tank can directly collect water that drips naturally during the pressing process; the first vacuum pump under the couch roll can quickly remove water adhering to the surface of the couch roll; and the second vacuum pump around the outer periphery of the felt belt continuously dehumidifies and regenerates the saturated felt belt. This combined design not only achieves comprehensive moisture collection but also avoids the impact of residual moisture on the equipment surface on operational accuracy and the problem of secondary moisture absorption by the paper web, significantly improving the stability and continuity of the production process. Attached Figure Description

[0008] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is a schematic diagram of the production line for this utility model.

[0009] Legend: 1. Flat roller; 2. Pressure roller; 3. Adjusting device; 31. Support 1; 32. Hydraulic cylinder; 33. Support 2; 34. Lever arm; 4. Roller; 5. Fabric belt; 6. Water collection tank. Detailed Implementation

[0010] The following description, in conjunction with the accompanying drawings, further illustrates the flat roller pressing device of this utility model.

[0011] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0012] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0013] See appendix Figure 1-2As shown, this embodiment of a flat roller pressing device includes a flat roller 1 installed on a production line. It is characterized by further including a pressure roller 2 distributed vertically to the flat roller 1 for cooperating in squeezing moisture from the paper web and adjusting the distance between the two; an adjusting device 3 for adjusting the distance between the flat roller 1 and the pressure roller 2; several rollers 4 installed on the production line; and a felt belt 5 wrapped around the outer circumference of the pressure roller 2 and the several rollers 4 for absorbing water seeping from the paper web during the pressing process. The adjusting device 3 includes a first support 31, a hydraulic cylinder 32 connected to the first support 31, a second support 33 connected to the first support 31 and located away from the cylinder body of the hydraulic cylinder 32, and a lever arm 34 connected to the output end of the hydraulic cylinder 32 and rotatably connected to the second support 33 for fixing the pressure roller 2.

[0014] The flat roller 1 is fixedly installed at a predetermined position on the papermaking production line. The pressure roller 2 is connected to the end of the lever arm 34 of the adjusting device 3 through the bearing seats at both ends, so that the pressure roller 2 is precisely positioned above the flat roller 1, forming a pair of parallel extrusion pairs. The production line is equipped with a hydraulic system that controls the opening and closing of the hydraulic cylinder 32. When the piston rod of the hydraulic cylinder 32 extends, it pushes the pre-connected lever arm 34 to swing downward around its rotational connection point with the support 33, thereby driving the pressure roller 2 fixed on the lever arm 34 to move closer to the flat roller 1, reducing the distance between the two, adapting to paper webs of different thicknesses, and increasing the linear pressure on the paper web. When the wet paper web with a large amount of moisture passes through the pressure zone between the flat roller 1 and the pressure roller 2, it is subjected to mechanical extrusion, and a large amount of moisture inside the paper web is forced out. Part of the extruded moisture is directly collected, and the other part is absorbed and carried away by the felt belt 5 wrapped around the roller 4 and the pressure roller 2, keeping the production line dry.

[0015] By setting up pressure rollers 2 that are distributed vertically and vertically to the flat roller 1, the two form a highly efficient mechanical pressing zone, which can apply uniform and stable squeezing force to the paper web, forcefully squeezing out the moisture between the paper web fibers, laying the foundation for the dewatering process; at the same time, the specially added felt belt 5 is closely attached to the surface of the pressure roller 2 and operates synchronously, which can immediately absorb the free water that has been squeezed out but has not been discharged in time, forming a physical barrier layer, fundamentally preventing water from seeping back into the paper web, thereby greatly improving the overall dewatering efficiency and dewatering rate, and reducing the burden on the subsequent drying process.

[0016] By equipping the device with adjustment device 3, the linear driving force of hydraulic cylinder 32 drives power arm 34 to rotate around the hinge point of bracket 2 33, thereby achieving precise adjustment of the distance between pressure roller 2 and flat roller 1. The pressing pressure can be flexibly adjusted according to the production needs of different paper types, ensuring uniform pressure across the entire paper web, effectively reducing local moisture residue, improving the uniformity of dryness and the stability of physical properties after paper web forming, and greatly enhancing the adaptability of the device to different paper types and production processes, thus expanding the scope of application of the equipment.

[0017] See appendix Figure 1-2 As shown, several water collection tanks 6 are provided below the flat roller 1 to collect the water squeezed out from the paper web; vacuum pumps connected to the water collection tanks 6 are provided below the flat roller 1 and on the outer side of the outer periphery of the felt belt 5.

[0018] When the pressure roller 2 and the back roller 1 rotate relative to each other in a preset direction and synchronously convey the paper web, the squeezing zone formed by the two applies stable pressure to the paper web, efficiently squeezing out the moisture between the paper web fibers. During this process, the moisture generated by pressing undergoes a "dual-path treatment": some of the moisture adheres directly to the surface of the flat roller 1 or is distributed in a free state in the area below the flat roller 1, and is quickly captured by a vacuum pump pre-fixed directly below the flat roller 1 through negative pressure adsorption, and then discharged directly into the water collection tank 6 through the output pipe of the vacuum pump; the remaining moisture that is not immediately adsorbed is quickly adsorbed by the felt belt 5 tightly wrapped around the outer circumference of the pressure roller 2 and several rollers 4 and running synchronously, as the rollers 2 and several rollers 4 continue to rotate. The fine fiber structure of the felt belt 5 can fully lock in the moisture, preventing it from dripping or seeping back into the paper web; at the same time, in order to ensure that the felt belt 5 always maintains a high water absorption capacity, in a specific section of its circulation path, a vacuum pump specially set on the outer circumference of its surface forms a close-fitting adsorption structure through a flexible hose: the suction port of the flexible hose is in close contact with the surface of the felt belt 5, and under the negative pressure of the vacuum pump, the moisture adsorbed in the fibers of the felt belt 5 is completely sucked out; the sucked-out moisture is directionally transported through a special pipe sealed to the vacuum pump, and finally flows into the water collection tank 6.

[0019] Through the synergistic structure of felt belt 5, water collection tank 6, and dual vacuum pumps, a multi-layered moisture collection and adsorption system is constructed: water collection tank 6 can directly collect water that drips naturally during the pressing process; the first vacuum pump under the flat roll 1 can quickly remove water adhering to the surface of the flat roll 1; and the second vacuum pump around the outer periphery of felt belt 5 continuously dehumidifies and regenerates the saturated felt belt 5. This combined design not only achieves all-round moisture collection, but also avoids the impact of residual moisture on the equipment surface on operating accuracy, as well as the problem of secondary moisture absorption of the paper web, significantly improving the stability and continuity of the production process.

[0020] In the process of using this invention, the paper web passes between the base roll 1 and the pressure roll 2. Based on the dewatering requirements and thickness of the paper web, the piston rod in the adjusting device 3 is driven to extend and retract by the hydraulic cylinder 32. When the piston rod of the hydraulic cylinder 32 extends, it pushes the lever arm 34 to rotate around its hinge point with the support 33, causing the pressure roll 2 to move closer to the base roll 1, reducing the distance between them and increasing the pressing pressure. When the piston rod of the hydraulic cylinder 32 retracts, it pulls the lever arm 34 to rotate in the opposite direction, causing the pressure roll 2 to move away from the base roll 1, increasing the distance between them and decreasing the pressing pressure. This adjustment process amplifies and transmits force through the lever action of the lever arm 34, making the roll gap adjustment more precise and stable. This allows for flexible adjustment of the roll gap and pressing pressure, meeting the differentiated pressing strength requirements of different paper types and production processes. During the pressing process, the paper web is squeezed by the couch roll 1 and the pressure roll 2, and the water seeping out is discharged through multiple paths. Some of the water drips directly into the water collection tank 6 directly below the couch roll 1 under the influence of gravity; the other part is quickly absorbed by the felt belt 5, which is closely attached to the surface of the pressure roll 2 and moves synchronously with it, effectively preventing water from seeping back into the paper web. At the same time, the first vacuum pump located below the couch roll 1 uses negative pressure to quickly extract the residual water and nearby moisture on the surface of the couch roll 1 into the water collection tank 6. The second vacuum pump located on the outer periphery of the felt belt 5 continuously dehumidifies the saturated felt belt 5, ensuring that the felt belt 5 always maintains good water absorption capacity, and the extracted water also flows into the water collection tank 6. The combination of dual vacuum extraction and gravity collection ensures that the water produced during pressing can be collected quickly and efficiently, completely preventing water from remaining on the equipment surface or dripping into other areas of the production line. This not only ensures a dry and clean production environment but also achieves centralized recycling of water resources.

[0021] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A flat roller pressing device, comprising a flat roller (1) installed on a production line, characterized in that: It also includes a pressure roller (2) that is distributed vertically to the flat roller (1) to cooperate in squeezing the moisture in the paper web and to adjust the distance between the two; an adjustment device (3) for adjusting the distance between the flat roller (1) and the pressure roller (2); several rollers (4) set on the production line; and a felt belt (5) wrapped around the outer circumference of the pressure roller (2) and several rollers (4) to absorb the water seeping out of the paper web during the pressing process; the adjustment device (3) includes a support (31), a hydraulic cylinder (32) connected to the support (31), a support (33) connected to the support (31) and away from the cylinder body end of the hydraulic cylinder (32), and a lever arm (34) connected to the output end of the hydraulic cylinder (32) and rotatably connected to the support (33) for fixing the pressure roller (2).

2. The flat roller pressing device according to claim 1, characterized in that: Below the roller (1) are several water collection tanks (6) for collecting water squeezed from the paper web.

3. The flat roller pressing device according to claim 2, characterized in that: Vacuum pumps connected to water collection tanks (6) are provided below the roller (1) and on the outer periphery of the felt belt (5).

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