Papermaking vacuum press roll matched with centrifugal dewatering

Abstract

The utility model relates to the technical field of vacuum press rolls, in particular to a papermaking vacuum press roll matched with centrifugal dewatering, which comprises a frame, a rotating shaft is rotatably arranged on the frame, a hollow vacuum press roll is fixed on the rotating shaft, holes are uniformly arranged on the vacuum press roll, and the holes are communicated with the vacuum press roll. A piston barrel is arranged on the inner side of the vacuum press roll, the two ends of the piston barrel are fixed to the rack through connecting rods respectively, a piston is movably clamped in the piston barrel, the piston is matched with a rotating shaft through a linkage structure, and the rotating shaft can drive the piston to horizontally move on the inner side of the piston barrel while rotating; according to the vacuum press roll dewatering device, when negative pressure dewatering is utilized, a vacuum pump is not needed for continuous suction, power consumption can be effectively reduced, meanwhile, paper pulp chippings blocked in holes in the surface of the vacuum press roll and impurities in spraying water can be removed, the blocking risk is reduced, and the dewatering efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum press roller technology, specifically a papermaking vacuum press roller that is used in conjunction with centrifugal dewatering. Background Technology

[0002] Vacuum press rolls are the core equipment of the press section of paper machines. By combining mechanical pressing force and vacuum suction, they achieve efficient dewatering, compaction, and performance optimization of wet paper sheets. Existing vacuum press rolls rely on continuous suction from vacuum pumps, resulting in high energy consumption. Pulp debris and impurities in the spray water can easily clog the press roll orifices, reducing dewatering efficiency. The chelates formed by the scale inhibitor and calcium and magnesium ions in the spray water can adhere to the orifices, exacerbating the risk of clogging. Clogging can cause the paper web to reabsorb water and become fluffy, increasing the paper breakage rate. Although existing technologies have made various improvements to the press roll structure, their adaptability to centrifugal dewatering scenarios is still insufficient. For example, key issues such as orifice clogging prevention, drainage efficiency, and energy consumption control have not yet been systematically resolved.

[0003] Therefore, there is an urgent need for a vacuum press roll structure that combines centrifugal force characteristics, has dynamic adjustment function, and can effectively prevent clogging, in order to improve dewatering efficiency and reduce energy consumption. To this end, we provide a papermaking vacuum press roll that works in conjunction with centrifugal dewatering to solve the problems mentioned above. Utility Model Content

[0004] The purpose of this invention is to provide a papermaking vacuum press roll that works in conjunction with centrifugal dewatering to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A papermaking vacuum press roll for centrifugal dewatering includes a frame, a rotating shaft rotatably mounted on the frame, a hollow vacuum press roll fixed on the rotating shaft, the vacuum press roll having evenly spaced holes, a piston cylinder disposed on the inner side of the vacuum press roll, the piston cylinder being fixed to the frame at both ends by connecting rods, a piston being movably engaged inside the piston cylinder, the piston and the rotating shaft being coupled by a linkage structure, the rotating shaft rotating while driving the piston to move horizontally inside the piston cylinder, an air inlet pipe and an air outlet pipe being fixedly mounted on the piston cylinder.

[0007] As described above, a papermaking vacuum press roll that is used in conjunction with centrifugal dewatering: a drive motor is provided on the outside of the rotating shaft, and the rotating shaft is installed at the output end of the drive motor and driven to rotate by the drive motor.

[0008] As described above, a papermaking vacuum press roll for centrifugal dewatering is provided with partitions at both ends of the piston cylinder, the outer diameter of which is adapted to the inner diameter of the vacuum press roll. The space between the partitions, the vacuum press roll, and the piston cylinder is used to form a vacuum region.

[0009] As described above, a papermaking vacuum press roll for centrifugal dewatering includes a linkage structure comprising a cylinder fixed to a piston and an insert rod fixed to a rotating shaft. The insert rod passes through a connecting rod and is movably inserted into the cylinder. A spiral groove is provided on the insert rod. A ball bearing is embedded and engaged in the inner wall of the cylinder. The ball bearing is movably engaged in the spiral groove and can slide along the track of the spiral groove. A limiting component for horizontal piston movement is provided on the inner side of the piston cylinder.

[0010] As described above, a papermaking vacuum press roll for centrifugal dewatering includes a limiting rod fixed on a piston and a limiting cylinder fixed on a frame, wherein the limiting rod is movably inserted into the limiting cylinder.

[0011] As described above, a papermaking vacuum press roll for centrifugal dewatering is provided with one-way valves installed on the air inlet pipe and the air outlet pipe. The air inlet pipe allows air from the inside of the vacuum press roll to enter the piston cylinder in one direction only, and the air outlet pipe allows air from the inside of the piston cylinder to enter the inside of the vacuum press roll in one direction only.

[0012] A papermaking vacuum press roll as described above, in conjunction with centrifugal dewatering: a pressure sensor is fixedly installed on the top of the vacuum press roll for detecting the magnitude of the pressure it experiences.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: When this papermaking vacuum press roller uses negative pressure to vacuum absorb water from the paper, it no longer requires a vacuum pump for continuous suction. In use, an external motor drives the rotating shaft to rotate, which in turn drives the vacuum press roller to rotate. The pressure roller set above the vacuum press roller works in conjunction with the vacuum press roller to squeeze the paper passing through the gap between the two. A piston cylinder is set inside the vacuum press roller, and a piston is movably locked inside the piston cylinder. The piston and the rotating shaft are connected by a linkage structure. When the rotating shaft rotates, it also drives the piston to move horizontally to one side inside the piston cylinder. This, together with the air inlet pipe installed on the piston cylinder, can draw air from the gap between the vacuum press roller, the piston cylinder, and the partition to form a vacuum area. As the paper passes through the surface of the vacuum press roller, the internal water is squeezed out. The negative pressure formed by the vacuum area inside the vacuum press roller draws the squeezed water into the inside of the vacuum press roller through the holes, achieving efficient dehydration of wet paper. Therefore, this utility model only requires an external motor as a driving source and does not require a vacuum pump for continuous suction, which can effectively reduce power consumption.

[0014] After the paper is squeezed and dewatered on the vacuum press rolls, the external motor drives the shaft to reverse, causing the vacuum press rolls to rotate at high speed. Centrifugal force is used to throw out the water adsorbed on the inside and surface of the vacuum press rolls, allowing the vacuum press rolls to dewater quickly for easy reuse and preventing moisture residue from wetting the paper surface again. At the same time, when the shaft reverses, it drives the piston to move horizontally to the other side inside the piston cylinder. This, together with the air outlet pipe, allows air to be pumped into the gaps between the vacuum press rolls, piston cylinder, and partitions. When the vacuum press rolls rotate for centrifugal dewatering, the pumped air can blow away pulp debris and impurities in the sprayed water that are clogging the orifices, thereby reducing the risk of clogging and improving dewatering efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a papermaking vacuum press roller that is used in conjunction with centrifugal dewatering.

[0016] Figure 2 For use with a papermaking vacuum press roll in conjunction with centrifugal dewatering Figure 1 A schematic diagram of the structure of a partially cut-open vacuum press roller.

[0017] Figure 3 This is a cross-sectional schematic diagram of a papermaking vacuum press roll designed for centrifugal dewatering.

[0018] Figure 4 For use with a papermaking vacuum press roll in conjunction with centrifugal dewatering Figure 3 A partially enlarged structural diagram.

[0019] Figure 5 For use with a papermaking vacuum press roll in conjunction with centrifugal dewatering Figure 1 A schematic diagram of the structure of the vacuum press roller and piston cylinder after partial cross-section.

[0020] Figure 6 For use with a papermaking vacuum press roll in conjunction with centrifugal dewatering Figure 5 A schematic diagram of the decomposed local structure.

[0021] Figure 7 For use with a papermaking vacuum press roll in conjunction with centrifugal dewatering Figure 6 A schematic diagram of the decomposed local structure.

[0022] In the diagram: 1. Frame; 2. Shaft; 3. Vacuum press roller; 4. Orifice; 5. Piston cylinder; 6. Connecting rod; 7. Partition plate; 8. Piston; 9. Cylinder body; 10. Insert rod; 11. Inlet pipe; 12. Outlet pipe; 13. Limiting cylinder; 14. Limiting rod; 15. Spiral groove; 16. Ball bearing. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figures 1 to 7 As an embodiment of this utility model, a papermaking vacuum press roller for centrifugal dewatering includes a frame 1, a rotating shaft 2 rotatably mounted on the frame 1, a hollow vacuum press roller 3 fixed on the rotating shaft 2, holes 4 evenly distributed on the vacuum press roller 3, a piston cylinder 5 disposed on the inner side of the vacuum press roller 3, the two ends of the piston cylinder 5 being fixed to the frame 1 by connecting rods 6 respectively, a piston 8 being movably engaged inside the piston cylinder 5, the piston 8 and the rotating shaft 2 being engaged by a linkage structure, the rotating shaft 2 rotating while driving the piston 8 to move horizontally inside the piston cylinder 5, an air inlet pipe 11 and an air outlet pipe 12 being fixedly mounted on the piston cylinder 5.

[0025] In this embodiment, during use, an external motor is started, driving the rotating shaft 2 to rotate and causing the vacuum press roller 3 to rotate. Another set of pressure rollers is positioned above the vacuum press roller 3, working in conjunction with it to squeeze the paper passing through the gap between the two rollers. A piston cylinder 5 is installed inside the vacuum press roller 3, and a piston 8 is movably engaged within the piston cylinder 5. The piston 8 and the rotating shaft 2 are linked by a linkage structure. As the rotating shaft 2 rotates, it also drives the piston 8 to move horizontally to one side inside the piston cylinder 5. This, combined with the air inlet pipe 11 installed on the piston cylinder 5, draws air from the gap between the vacuum press roller 3, the piston cylinder 5, and the partition 7, creating a vacuum area. As the paper passes over the surface of the vacuum press roller 3, the internal moisture is squeezed out. The negative pressure created by the vacuum area within the vacuum press roller 3 draws the squeezed-out moisture into the inside of the vacuum press roller 3 through the holes 4, achieving efficient dehydration of the wet paper. This invention requires only an external motor as a driving source, eliminating the need for a continuous vacuum pump and effectively reducing power consumption. Furthermore, after the paper is squeezed and dehydrated on the vacuum press roller 3, the external motor drives the rotating shaft 2 to reverse, causing the vacuum press roller 3 to rotate at high speed. Centrifugal force is used to fling out the water adsorbed on the inside and surface of the vacuum press roller 3, enabling rapid dehydration and facilitating future use. This prevents residual moisture from wetting the paper again. Simultaneously, the reverse rotation of the rotating shaft 2 drives the piston 8 to move horizontally to the other side inside the piston cylinder 5. This, in conjunction with the air outlet pipe 12, pumps air into the gap between the vacuum press roller 3, piston cylinder 5, and partition 7. During centrifugal dehydration, the pumped air removes pulp debris and impurities from the sprayed water that clog the orifices 4, reducing the risk of clogging and improving dehydration efficiency.

[0026] As a further embodiment of this utility model, a drive motor is provided on the outside of the rotating shaft 2, and the rotating shaft 2 is installed at the output end of the drive motor and driven to rotate by the drive motor.

[0027] In this embodiment, the drive motor is electrically connected to an external power source via wires. The drive motor can rotate in both forward and reverse directions through control and adjustment. Starting the drive motor can drive the rotating shaft 2 to rotate.

[0028] As a further embodiment of this utility model, the piston cylinder 5 is fixed with partitions 7 at both ends, the outer diameter of which is adapted to the inner diameter of the vacuum press roller 3. The space between the partitions 7, the vacuum press roller 3, and the piston cylinder 5 is used to form a vacuum region.

[0029] In this embodiment, a vacuum area is formed in the space between the partition 7, the vacuum press roller 3, and the piston cylinder 5. When the paper passes over the surface of the vacuum press roller 3, the internal moisture is squeezed out. Combined with the negative pressure formed in the vacuum area inside the vacuum press roller 3, the squeezed-out water can be sucked into the inside of the vacuum press roller 3 through the holes 4, thereby achieving efficient dehydration of the wet paper.

[0030] As a further embodiment of this utility model, the linkage structure includes a cylinder 9 fixed to the piston 8 and an insert rod 10 fixed to the rotating shaft 2. The insert rod 10 passes through the connecting rod 6 and is movably inserted into the inside of the cylinder 9. A spiral groove 15 is provided on the insert rod 10. A ball bearing 16 is embedded and engaged in the inner wall of the cylinder 9. The ball bearing 16 is movably engaged in the spiral groove 15 and can slide along the track where the spiral groove 15 is located. A limiting component for the piston 8 when it moves horizontally is provided on the inner side of the piston cylinder 5.

[0031] In this embodiment, when the rotating shaft 2 rotates, it will drive the insert rod 10 to rotate. The ball bearing 16 is movably engaged inside the spiral groove 15 and can slide along the track of the spiral groove 15, which can drive the cylinder 9 to move horizontally.

[0032] As a further embodiment of this utility model, the limiting assembly includes a limiting rod 14 fixed on the piston 8 and a limiting cylinder 13 fixed on the frame 1, with the limiting rod 14 movably inserted into the limiting cylinder 13.

[0033] In this embodiment, the limiting rod 14 is movably inserted into the limiting cylinder 13. When the cylinder 9 moves horizontally, the limiting rod 14 can be sleeved on the limiting cylinder 13 to limit the horizontal movement of the cylinder 9 and prevent it from shifting position during movement.

[0034] As a further embodiment of this utility model, one-way valves are installed on the air inlet pipe 11 and the air outlet pipe 12 respectively. The air inlet pipe 11 only allows air inside the vacuum press roller 3 to enter the piston cylinder 5 in one direction through the air inlet pipe 11, and the air outlet pipe 12 only allows air inside the piston cylinder 5 to enter the vacuum press roller 3 in one direction through the piston cylinder 5.

[0035] In this embodiment, as the rotating shaft 2 rotates, it also drives the piston 8 to move horizontally to one side inside the piston cylinder 5. This, in conjunction with the air inlet pipe 11 installed on the piston cylinder 5, can draw air from the gap between the vacuum pressing roller 3, the piston cylinder 5, and the partition plate 7 to form a vacuum area. When the rotating shaft 2 reverses, it drives the piston 8 to move horizontally to the other side inside the piston cylinder 5. This, in conjunction with the air outlet pipe 12, can pump air into the gap between the vacuum pressing roller 3, the piston cylinder 5, and the partition plate 7.

[0036] As a further embodiment of this invention, a pressure sensor for detecting the magnitude of the pressure applied to the vacuum press roller 3 is fixedly installed on its top.

[0037] In this embodiment, the pressure sensor is electrically connected to an external power source via a wire. The pressure sensor can detect the squeezing force of the external pressure roller on the vacuum press roller 3 in real time, which makes it easy to adjust the squeezing force by adjusting the position of the external pressure roller to meet the squeezing and dewatering requirements of paper of different thicknesses.

[0038] The working principle of this utility model is as follows: When in use, an external motor is started, driving the rotating shaft 2 to rotate, which in turn rotates the vacuum press roller 3. Another set of press rollers is installed above the vacuum press roller 3, working in conjunction with it to squeeze the paper passing through the gap between the two rollers. A piston cylinder 5 is installed inside the vacuum press roller 3, and a piston 8 is movably engaged within the piston cylinder 5. The piston 8 and the rotating shaft 2 are connected via a linkage structure. As the rotating shaft 2 rotates, it also drives the piston 8 to move horizontally to one side inside the piston cylinder 5. This, combined with the air inlet pipe 11 installed on the piston cylinder 5, draws air from the gap between the vacuum press roller 3, the piston cylinder 5, and the partition 7, creating a vacuum area. As the paper passes over the surface of the vacuum press roller 3, the internal moisture is squeezed out. The negative pressure created by the vacuum area inside the vacuum press roller 3 draws the squeezed-out moisture back in through the holes 4. Inside the vacuum press roller 3, efficient dewatering of wet paper is achieved. After the paper is squeezed and dewatered on the vacuum press roller 3, the external motor drives the rotating shaft 2 to reverse, causing the vacuum press roller 3 to rotate at high speed. Centrifugal force is used to throw out the water adsorbed on the inside and surface of the vacuum press roller 3, allowing the vacuum press roller 3 to dewater quickly, making it easy to use next time and preventing moisture residue from returning to wet the paper surface. At the same time, when the rotating shaft 2 reverses, it will drive the piston 8 to move horizontally to the other side inside the piston cylinder 5. This, together with the air outlet pipe 12, can pump air into the gap between the vacuum press roller 3, the piston cylinder 5, and the partition plate 7. When the vacuum press roller 3 rotates for centrifugal dewatering, the increased pressure in the gap by pumping air can blow away pulp debris and impurities in the sprayed water that are clogging the holes 4, thereby reducing the risk of clogging and improving dewatering efficiency.

[0039] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. A papermaking vacuum press roll for use with centrifugal dewatering, comprising a frame (1), characterized in that, A rotating shaft (2) is rotatably mounted on the frame (1). A hollow vacuum pressing roller (3) is fixed on the rotating shaft (2). Holes (4) are evenly opened on the vacuum pressing roller (3). A piston cylinder (5) is provided on the inner side of the vacuum pressing roller (3). The two ends of the piston cylinder (5) are fixed to the frame (1) by connecting rods (6). A piston (8) is movably engaged inside the piston cylinder (5). The piston (8) and the rotating shaft (2) are connected by a linkage structure. When the rotating shaft (2) rotates, it will drive the piston (8) to move horizontally inside the piston cylinder (5). An air inlet pipe (11) and an air outlet pipe (12) are fixedly installed on the piston cylinder (5).

2. The papermaking vacuum press roll according to claim 1, characterized in that, A drive motor is provided on the outside of the rotating shaft (2). The rotating shaft (2) is installed at the output end of the drive motor and is driven to rotate by the drive motor.

3. The papermaking vacuum press roll according to claim 1, characterized in that, The piston cylinder (5) is fixed at both ends with partitions (7) whose outer diameter is adapted to the inner diameter of the vacuum press roller (3). The space between the partitions (7), the vacuum press roller (3), and the piston cylinder (5) is used to form a vacuum area.

4. The papermaking vacuum press roll according to claim 1, characterized in that, The linkage structure includes a cylinder (9) fixed to the piston (8) and an insert rod (10) fixed to the rotating shaft (2). The insert rod (10) passes through the connecting rod (6) and is movably inserted into the cylinder (9). A spiral groove (15) is provided on the insert rod (10). A ball (16) is embedded and engaged in the inner wall of the cylinder (9). The ball (16) is movably engaged in the spiral groove (15) and can slide along the track where the spiral groove (15) is located. A limiting component is provided on the inner side of the piston cylinder (5) when the piston (8) moves horizontally.

5. A papermaking vacuum press roll for centrifugal dewatering as described in claim 4, characterized in that, The limiting assembly includes a limiting rod (14) fixed on the piston (8) and a limiting cylinder (13) fixed on the frame (1), wherein the limiting rod (14) is movably inserted into the limiting cylinder (13).

6. A papermaking vacuum press roll for centrifugal dewatering as described in claim 1, characterized in that, One-way valves are installed on the air inlet pipe (11) and the air outlet pipe (12). The air inlet pipe (11) allows air inside the vacuum press roller (3) to enter the piston cylinder (5) in one direction only. The air outlet pipe (12) allows air inside the piston cylinder (5) to enter the vacuum press roller (3) in one direction only.

7. A papermaking vacuum press roll for centrifugal dewatering as described in claim 1, characterized in that, A pressure sensor for detecting the magnitude of the pressure applied to the vacuum press roller (3) is fixedly installed on the top of the roller.

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