Super high vacuum box dewatering device for long wire paper machines

Abstract

The utility model discloses a long -net paper machine is with superhigh vacuum tank dewatering device, it is in solving traditional vacuum couch roll energy consumption high, the problem of low dewatering efficiency. The device includes the dehydration tank body of top surface opening, is equipped with the seal of section "L" shape on its top surface, and the vertical part of seal is inlaid into the box with the box inner wall adhesion, and the horizontal part outside is grooved and is built -in air bag, and can dynamic compensation paper width fluctuation, and the height adjustment is realized to the end of tank body through right angle support board cooperation support lead screw, and the support intensity is enhanced to triangular plate, and the inside of tank body is divided into a plurality of chambers, and negative pressure pipe branch pipe is connected with each chamber to control vacuum degree independently, and is equipped with drainage pipe and drainage valve in the bottom. The utility model discloses through adopting above -mentioned structure, relies on the elastic compensation of L shape seal and air bag, and the adjustable support structure of partition vacuum control, makes vacuum degree fluctuation effectively drop, and energy consumption reduces 10% in unit output, and paper page dryness improves, is applicable to long -net paper machine energy -efficient dewatering, promotes papermaking industry green transformation.

Description

Technical Field

[0001] This utility model relates to the field of papermaking equipment technology, specifically to an ultra-high vacuum chamber dewatering device for a long-wire papermaking machine. Background Technology

[0002] In the modern paper industry, the dewatering technology of the wire section of the fourdrinier paper machine directly affects the efficiency, energy consumption, and product quality of paper production. With the development of papermaking equipment towards larger sizes, wider widths, and higher speeds (machine speeds have generally increased to over 1000 m / min), the technical bottlenecks of traditional dewatering devices are becoming increasingly prominent. For example, traditional fourdrinier paper machines mostly use vacuum coils or single-cavity vacuum boxes as dewatering elements, and their sealing structures are typically single-lip or flat-face seal designs. When the paper web thickness fluctuates by more than 0.3 mm or the machine speed exceeds 800 m / min, the contact pressure between the traditional sealing lip and the paper web becomes uneven, leading to increased vacuum leakage and a significant decrease in dewatering efficiency. Simultaneously, when producing different types of paper (such as packaging paper and tissue paper), a single vacuum level is insufficient to balance dewatering efficiency and energy consumption. For instance, producing high-basis-weight packaging paper requires a vacuum level of -85 kPa, while producing thin sheets only requires -70 kPa. Traditional vacuum boxes, mostly using a single-cavity structure, cannot achieve zoned vacuum level adjustment, resulting in increased energy consumption per unit output. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an ultra-high vacuum chamber dewatering device for a long-wire paper machine, which can overcome the problems in the existing technology, achieve the purpose of vacuum dewatering, reduce the risk of vacuum leakage, and realize zoned vacuum control according to the production needs of different paper types.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a dewatering device for an ultra-high vacuum box for a long-wire paper machine, including a dewatering box body, the top surface of the dewatering box body is open, a sealing element is provided on the top surface of the dewatering box body, the sealing element has an "L" shaped cross section, and the vertical part of the sealing element is attached to the upper edge of the inner wall of the dewatering box body and extends into the dewatering box body.

[0005] The outer side of the horizontal portion of the seal is provided with a groove, and an airbag is provided in the groove.

[0006] In a preferred embodiment, the dehydration chamber is provided with support plates on both sides of its end. The support plates are right-angled plate structures, and vertical support rods are threaded through the horizontal part of the support plates.

[0007] In a preferred embodiment, the support screw is provided with two nuts, which are located on the support screw on the upper and lower sides of the support plate, respectively.

[0008] In a preferred embodiment, the support plate is provided with a triangular plate for strengthening the support plate.

[0009] In a preferred embodiment, the dewatering chamber is provided with multiple partitions perpendicular to the conveying direction of the paper machine, which divide the interior of the dewatering chamber into multiple chambers.

[0010] In a preferred embodiment, a negative pressure pipe is provided at the end of the dehydration tank, and a branch pipe is provided on the negative pressure pipe. The branch pipe is connected to the end wall of multiple chambers in a one-to-one correspondence, and a multi-way valve is provided at the connection position between the negative pressure pipe and the branch pipe.

[0011] In a preferred embodiment, a pressure gauge is provided on the negative pressure pipe.

[0012] In a preferred embodiment, the sealing element has a sealing strip in the middle, and the bottom surface of the sealing strip has an interlocking groove that engages with the top surface of the partition.

[0013] In a preferred embodiment, the bottom of the dehydration tank is provided with multiple drain pipes connected to different chambers, and drain valves are provided on the drain pipes.

[0014] The ultra-high vacuum chamber dewatering device for a long-wire papermaking machine provided by this utility model has the following beneficial effects by adopting the above-mentioned structure:

[0015] (1) By inflating the airbag, the lip of the sealing component is subjected to force from the top and bottom and fits against the mesh and the box respectively, which can effectively ensure the vacuum degree inside the dehydration box and avoid vacuum leakage.

[0016] (2) The height of the dehydration chamber can be adjusted vertically by using a support screw and nut, which further ensures the internal vacuum during the production process of the chamber.

[0017] (3) Through the design of negative pressure branch pipes and multi-way valves, the vacuum degree of each zone can be independently adjusted by the PLC control system to meet the dewatering requirements of different types of paper. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the sealing component structure of this utility model.

[0021] Figure 3 This is a cross-sectional structural diagram of the assembly position of the sealing element and the dehydration chamber of this utility model.

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of the dehydration chamber of this utility model.

[0023] In the diagram: 1. Dehydration chamber; 2. Support plate; 3. Support screw; 4. Nut; 5. Triangular plate; 6. Partition; 7. Seal; 8. Negative pressure pipe; 9. Branch pipe; 10. Pressure gauge; 11. Groove; 12. Airbag; 13. Engaging groove; 14. Drain pipe; 15. Drain valve; 16. Sealing strip. Detailed Implementation

[0024] like Figure 1-4 In the present invention, a dewatering device for an ultra-high vacuum box for a long-wire paper machine includes a dewatering box 1, wherein the top surface of the dewatering box 1 is open and a sealing element 7 is provided on the top surface of the dewatering box 1. The sealing element 7 has an "L" shaped cross section and the vertical part of the sealing element 7 is attached to the upper edge of the inner wall of the dewatering box 1 and extends into the dewatering box 1.

[0025] The outer side of the horizontal portion of the seal 7 is provided with a groove 11, and an airbag 12 is provided in the groove 11.

[0026] In a preferred embodiment, the dehydration chamber 1 is provided with support plates 2 on both sides of its end. The support plates 2 are right-angled plate structures, and vertical support rods 3 are threaded through the horizontal part of the support plates 2.

[0027] In a preferred embodiment, the support screw 3 is provided with two nuts 4, which are located on the support screw 3 on the upper and lower sides of the support plate 2, respectively.

[0028] In a preferred embodiment, the support plate 2 is provided with a triangular plate 5 for strengthening the support plate 2.

[0029] In a preferred embodiment, the dewatering chamber 1 is provided with multiple partitions 6 perpendicular to the conveying direction of the paper machine, which divide the interior of the dewatering chamber 1 into multiple chambers.

[0030] In a preferred embodiment, a negative pressure pipe 8 is provided at the end of the dehydration chamber 1, and a branch pipe 9 is provided on the negative pressure pipe 8. The branch pipe 9 is connected to the end walls of multiple chambers in a one-to-one correspondence, and a multi-way valve is provided at the connection position between the negative pressure pipe 8 and the branch pipe 9.

[0031] In a preferred embodiment, a pressure gauge 10 is provided on the negative pressure pipe 8.

[0032] In a preferred embodiment, the sealing element 7 has a sealing strip 16 in the middle, and the bottom surface of the sealing strip 16 has an engagement groove 13, which engages with the top surface of the partition 6.

[0033] In a preferred embodiment, the bottom of the dehydration chamber 1 is provided with multiple drain pipes 14 connected to different chambers, and drain valves 15 are provided on the drain pipes 14.

[0034] The present invention discloses an ultra-high vacuum chamber dewatering device for a long-wire papermaking machine, wherein:

[0035] The dewatering chamber 1 is welded from 316L stainless steel, with its top opening aligned with the paper web running path of the fourdrinier paper machine. Two partitions 6 are welded to the inner wall of the chamber along the paper web running direction, dividing the chamber into three independent chambers. The height of the partitions is flush with the inner wall of the chamber.

[0036] The sealing element 7 is injection molded from a composite of fluororubber and a 304 stainless steel frame, with an L-shaped cross-section. The outer side of the vertical part is fitted and fixed to the upper edge of the inner wall of the box. A groove 11 is opened on the outer side of the horizontal part, and a cylindrical airbag 12 with the same length as the sealing element is built in. The airbag is connected to a 0.1MPa air pressure control system through an air pipe, which can inflate in real time to compensate for paper web fluctuations. A neoprene rubber sealing strip 16 is set in the middle of the sealing element, and the bottom interlocking groove 13 is interference-fitted with the groove on the top surface of the partition to form a zoned seal.

[0037] Two right-angle support plates 2 are welded to each end of the dehydration chamber. Through holes are opened on the horizontal part of the support plates 2, and M18 support screws 3 are inserted through them. A nut 4 is installed on each of the upper and lower sides of the screws 3. The height of the chamber is adjusted by rotating the nuts. Triangular plates 5 are welded to the inside of the support plates to enhance the rigidity of the support structure.

[0038] A negative pressure pipe 8 is welded to one end of the chamber. Three branch pipes 9 are installed on the pipe, each connecting to an interface on the end wall of each chamber. A magnetic levitation vacuum pump (model MSS-1000) and a pressure gauge 10 are connected in series on the negative pressure pipe 8. The speed range of the vacuum pump is adjusted by a frequency converter control system. A drain pipe 14 is welded to the bottom of each chamber, and an electric drain valve 15 is installed on the pipe.

[0039] When the paper thickness fluctuates, the air pressure control system automatically adjusts the pressure of the airbag 12, causing the horizontal part of the seal 7 to be elastically pressed down to maintain the sealing pressure and reduce the fluctuation of vacuum.

[0040] When producing packaging paper, the vacuum level of three chambers is gradually increased, such as -80kPa in Zone 1, -85kPa in Zone 2, and -90kPa in Zone 3. The paper web dryness is increased from 42% to 45%, which is more efficient than the traditional single-chamber dewatering method.

[0041] The electric valves 15 of each chamber drain pipe 14 are opened at regular intervals (10 minutes apart) according to the liquid level sensor signal to ensure that the liquid level in the chamber does not exceed the set value, thereby further improving the stability of the vacuum.

Claims

1. A high vacuum chamber dewatering device for a long-wire papermaking machine, comprising a dewatering chamber (1), characterized in that: The top surface of the dehydration chamber (1) is open, and a sealing element (7) is provided on the top surface of the dehydration chamber (1). The sealing element (7) has an "L" shaped cross section. The vertical part of the sealing element (7) is attached to the upper edge of the inner wall of the dehydration chamber (1) and extends into the dehydration chamber (1). The seal (7) has a groove (11) on the outer side of the horizontal part, and an airbag (12) is provided in the groove (11).

2. The ultra-high vacuum chamber dewatering device for a fourdrinier paper machine according to claim 1, characterized in that: The dehydration chamber (1) has support plates (2) on both sides of its end. The support plates (2) are right-angled plate structures, and vertical support rods (3) are threaded through the horizontal part of the support plates (2).

3. The ultra-high vacuum chamber dewatering device for a long-wire papermaking machine according to claim 2, characterized in that: The support screw (3) is provided with two nuts (4), which are located on the support screw (3) on the upper and lower sides of the support plate (2).

4. The ultra-high vacuum chamber dewatering device for a long-wire papermaking machine according to claim 2, characterized in that: The support plate (2) is provided with a triangular plate (5) for strengthening the support plate (2).

5. The ultra-high vacuum chamber dewatering device for a fourdrinier paper machine according to claim 1, characterized in that: The dewatering chamber (1) is provided with multiple partitions (6) perpendicular to the conveying direction of the paper machine, which divide the interior of the dewatering chamber (1) into multiple chambers.

6. The ultra-high vacuum chamber dewatering device for a fourdrinier paper machine according to claim 5, characterized in that: The dehydration chamber (1) is provided with a negative pressure pipe (8) at one end, and a branch pipe (9) is provided on the negative pressure pipe (8). The branch pipe (9) is connected to the end wall of multiple chambers in a one-to-one correspondence. A multi-way valve is provided at the connection position between the negative pressure pipe (8) and the branch pipe (9).

7. The ultra-high vacuum chamber dewatering device for a fourdrinier paper machine according to claim 6, characterized in that: A pressure gauge (10) is installed on the negative pressure pipe (8).

8. The ultra-high vacuum chamber dewatering device for a fourdrinier paper machine according to claim 5, characterized in that: The sealing element (7) has a sealing strip (16) in the middle, and a meshing groove (13) is provided on the bottom surface of the sealing strip (16). The meshing groove (13) meshes with the top surface of the partition (6).

9. The ultra-high vacuum chamber dewatering device for a fourdrinier paper machine according to claim 5, characterized in that: The bottom of the dehydration tank (1) is provided with multiple drain pipes (14) connected to different chambers, and drain valves (15) are provided on the drain pipes (14).

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