Flow feeding forming device of paper machine

Abstract

A flowing forming device of a paper machine relates to the technical field of papermaking, and adopts the technical scheme that the flowing forming device comprises a white water tower and a headbox, the headbox is arranged on one side of a forming net and comprises a mixing chamber and a balancing chamber, a slushing pump is arranged at the bottom of the white water tower, and the mixing chamber is communicated with the balancing chamber. The slushing pump is sequentially connected to the first pressurized screen, the pulse attenuation tank, the pulp distribution header pipe and the mixing chamber through pipelines; a dilution water pump is arranged in the middle of the white water tower, the dilution water pump is sequentially connected to a second pressure screen, a dilution water pipe and a mixing chamber through pipelines, input pipes are arranged at the two ends of the balance chamber and connected with the pulp distribution header pipe and the dilution water pipe through two bypass pipes respectively, and the bypass pipes are provided with adjusting valves. Pressure is further balanced after paper pulp and dilution water are mixed, and fibers in the paper pulp are distributed more evenly; paper pulp at the edges of the two sides of the forming net is flushed out through the flange cleaning device, and the problems of edge breaking and pulp throwing of wet paper webs are solved.

Description

Technical Field

[0001] This utility model relates to the field of papermaking technology, and in particular to a papermaking machine flow forming device. Background Technology

[0002] The headstock forming unit is the most important part of a paper machine, currently typically completed in a dilution water headbox. In the dilution water headbox, pulp enters the mixing chamber through the main feed pipe, while dilution water enters through the dilution water pipe. After being thoroughly mixed, the pulp enters the balancing chamber and turbulence generator, and is then sprayed onto the forming wire to form a well-interwoven wet paper web. However, current production technologies suffer from problems with the headstock forming unit, including poor pulp suspension dilution uniformity, difficulty in cleaning the mixing chamber, and edge damage and pulp spillage during the forming process. These issues result in poor paper uniformity, long maintenance times, and paper breaks, affecting paper quality and reducing paper machine production efficiency. Utility Model Content

[0003] In view of the problems of poor pulp dilution uniformity, difficulty in cleaning the headbox mixing chamber and pulp rot and spillage during the forming process in the existing technical solutions, this utility model provides a paper machine flow forming device.

[0004] This utility model provides the following technical solution: a paper machine flow forming device, including a white water tower and a headbox. The headbox is located on one side of the forming wire and includes a mixing chamber and a balancing chamber. A slurry pump is installed at the bottom of the white water tower. The slurry pump is connected to a first pressure screen, a pulse attenuation tank, a main slurry distribution pipe, and the mixing chamber in sequence through pipes. A dilution water pump is installed in the middle of the white water tower. The dilution water pump is connected to a second pressure screen, a dilution water pipe, and the mixing chamber in sequence through pipes. Input pipes are installed at both ends of the balancing chamber. The input pipes are connected to the main slurry distribution pipe and the dilution water pipe respectively through two bypass pipes. Each bypass pipe is equipped with a regulating valve.

[0005] Preferably, the device further includes an edge cleaner disposed on the side of the forming mesh facing the headbox. The edge cleaner includes two edge plates disposed on both sides of the forming mesh, the edge plates extending to the headbox, and a water spray pipe disposed on the side of each edge plate away from each other. The water spray pipe is provided with a plurality of nozzles in sequence along the length of the device, and the nozzles are directed toward the edge of the forming mesh.

[0006] Preferably, both the main slurry distribution pipe and the dilution water pipe are equipped with return pipes. The return pipe of the main slurry distribution pipe is connected to the feed pipe of the slurry pump, and the return pipe of the dilution water pipe is connected to the middle of the white water tower.

[0007] Preferably, the first pressure screen is an internal flow slotted screen with a screen slot size of 0.2~0.5 mm; the second pressure screen is an internal flow perforated screen with a screen aperture size of 1~2 mm.

[0008] Preferably, the bottom of the forming mesh is provided with a white water channel, which is connected to the top of the white water tower.

[0009] Preferably, the device further includes a cleaner, which includes a cleaning pipe disposed on two cleaning support plates. The cleaning pipe is provided with a plurality of nozzle groups along its length, and the nozzle groups include a plurality of nozzles disposed on the cleaning pipe along its circumferential direction.

[0010] Preferably, the cleaning support plate is a right-angled trapezoid.

[0011] The beneficial effects of this utility model are as follows: an input pipe is added to both sides of the balance chamber, and the input pipe is connected to the main pulp distribution pipe and the dilution water pipe through two bypass pipes respectively. After the pulp and dilution water are mixed, the pressure is further balanced, the fiber distribution in the pulp is more uniform, and it is easier to form a wet paper web with well interwoven fibers; the edge cleaner is used to flush out the pulp at both edges of the forming wire to prevent the problem of wet paper web edge damage and pulp spillage; when the paper machine is stopped, the cleaner is used to quickly clean the mixing chamber of the headbox. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of one embodiment of the flow forming apparatus.

[0013] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0014] Figure 3 This is a schematic diagram of one embodiment of a sidewall cleaner.

[0015] Figure 4 This is a schematic diagram of one embodiment of the cleaner.

[0016] Reference numerals: 10, White water tower; 11, Slurry pump; 12, Dilution water pump; 20, Headbox; 21, Main slurry distribution pipe; 22, Dilution water pipe; 23, Input pipe; 24, Bypass pipe; 25, Return pipe; 30, Forming mesh; 31, White water channel; 40, First pressure screen; 50, Pulse attenuation tank; 60, Second pressure screen; 71, Side plate; 72, Spray pipe; 73, Nozzle; 80, Washer; 81, Cleaning support plate; 82, Cleaning pipe; 83, Nozzle. Detailed Implementation

[0017] The embodiments of this utility model will be described in more detail below with reference to the accompanying drawings and reference numerals, so that those skilled in the art can implement them after reading this specification. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] This utility model provides, for example Figure 1-4 The paper machine flow forming device shown includes a white water tower 10, a headbox 20, and a forming wire 30.

[0019] In this embodiment, the headbox 20 can be referenced as a dilution water headbox. The headbox 20 is located on one side of the forming mesh 30 and includes a mixing chamber and a balancing chamber connected in sequence. The white water tower 10 is divided into a bottom, middle, and top section according to its height. A slurry pump 11 is installed at the bottom of the white water tower 10. The slurry pump 11 is connected in sequence to a first pressure screen 40, a pulse attenuation tank 50, a slurry distribution main pipe 21, and a mixing chamber via pipes. A dilution water pump 12 is installed in the middle of the white water tower 10. The dilution water pump 12 is connected in sequence to a second pressure screen 60, a dilution water pipe 22, and a mixing chamber via pipes. The first pressure screen can be an internal flow slotted screen with a slit size of 0.2~0.5mm; the second pressure screen can be an internal flow perforated screen with a perforation diameter of 1~2mm.

[0020] The pulp at the bottom of the white water tower 10 is pumped to the first pressure screen 40 to remove impurities and then enters the pulse attenuation tank 50. After eliminating the complex pulse phenomenon during pulp transportation, it enters the mixing chamber in the headbox 20 through the pulp distribution main pipe 21. A distribution valve is installed between the pulp distribution main pipe 21 and the mixing chamber to control the flow rate. The dilution water pump 12 draws white water from the white water tower 10, removes impurities through the second pressure screen 60, and then enters the mixing chamber of the headbox through the dilution water pipe 22. A regulating valve is also installed between the dilution water pipe 22 and the mixing chamber. The dilution water and pulp mix in the mixing chamber to form a turbulent state, which makes the pulp fibers evenly distributed and adjusts the pulp to a preset concentration before entering the equilibration chamber.

[0021] The main pulp distribution pipe 21 and the dilution water pipe 22 typically extend from one end of the headbox 20 to the other. Based on existing technology, the headbox 20 also has input pipes 23 at both ends of the balancing chamber. These two input pipes 23 correspond to the ends of the main pulp distribution pipe 21 and the ends of the dilution water pipe 22, respectively. The input pipes 23 are connected to the main pulp distribution pipe 21 and the dilution water pipe 22 via two bypass pipes 24, thereby ensuring balanced pressure in the mixing chamber, more uniform fiber distribution in the pulp, and facilitating the formation of a well-interwoven wet paper web. Both bypass pipes 24 are equipped with regulating valves.

[0022] Preferably, both the main slurry distribution pipe 21 and the dilution water pipe 22 are equipped with return pipes 25, and the return pipes 25 are equipped with valves. The return pipes 25 of the main slurry distribution pipe 21 are connected to the feed pipe of the slurry pump 11, and the return pipes 25 of the dilution water pipe 22 are connected to the middle of the white water tower 10.

[0023] This embodiment also includes an edge cleaner disposed on the side of the forming wire 30 facing the headbox 20. The edge cleaner includes two edge plates 71 respectively disposed on both sides of the forming wire 30. The edge plates 71 extend to the headbox 20, and each of the two edge plates 71 has a water spray pipe 72 disposed on the side away from each other. The water spray pipe 72 has a plurality of nozzles 73 arranged sequentially along the length of the cleaner. The nozzles 73 on the two edge plates 71 face the side away from each other and towards the edge of the forming wire 30. The edge plates 71 limit the width of the wet paper web. By connecting the water spray pipes 72 to a high-pressure water pipe, the nozzles 73 spray water from the headbox 20 onto the edges of the forming wire 30, outside the two edge plates 71, to flush out the pulp and prevent the wet paper web from tearing and spilling pulp.

[0024] Preferably, the bottom of the forming mesh 30 is provided with a white water channel 31 for receiving pulp and white water falling from the forming mesh 30. The white water channel 31 is connected to the top of the white water tower 10 to recycle the white water back to the white water tower.

[0025] Furthermore, this embodiment also includes an external cleaner 80. The cleaner 80 includes a cleaning pipe 82 mounted on two cleaning support plates 81. The cleaning pipe 82 has multiple nozzle groups arranged along its length, and each nozzle group includes multiple nozzles 83 arranged circumferentially on the cleaning pipe 82. During short-term shutdowns of the paper machine, or in the event of fiber jamming or other problems in the headbox 20, the mixing chamber can be quickly opened, and the cleaning pipe 82 can be connected using a high-pressure or conventional pressure water pipe. The cleaner 80 can then be inserted into the mixing chamber to clean the interior of the headbox 20, removing impurities and ensuring the cleanliness of the headbox. The cleaning support plates 81 can adopt a right-angled trapezoidal structure to adapt to the internal structure of the headbox.

[0026] The above describes one or more embodiments of this utility model in a relatively specific and detailed manner, but it should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A paper machine flow forming device, comprising a white water tower and a headbox, the headbox being disposed on one side of the forming wire, the headbox including a mixing chamber and a balancing chamber, a slurry pump being disposed at the bottom of the white water tower, the slurry pump being connected in sequence to a first pressure screen, a pulse attenuation tank, a main slurry distribution pipe, and a mixing chamber via pipelines; a dilution water pump being disposed in the middle of the white water tower, the dilution water pump being connected in sequence to a second pressure screen, a dilution water pipe, and a mixing chamber via pipelines, characterized in that, Both ends of the balance chamber are equipped with input pipes, which are connected to the main slurry pipe and the dilution water pipe respectively through two bypass pipes. Each bypass pipe is equipped with a regulating valve.

2. The paper machine flow forming device according to claim 1, characterized in that, It also includes an edge cleaner disposed on the side of the forming mesh facing the headbox. The edge cleaner includes two edge plates disposed on both sides of the forming mesh, the edge plates extending to the headbox, and water spray pipes disposed on the side of the two edge plates away from each other. The water spray pipes are provided with a plurality of nozzles in sequence along the length of the cleaner, and the nozzles are facing the edge of the forming mesh.

3. The paper machine flow forming device according to claim 1, characterized in that, Both the main slurry distribution pipe and the dilution water pipe are equipped with return pipes. The return pipe of the main slurry distribution pipe is connected to the feed pipe of the slurry pump, and the return pipe of the dilution water pipe is connected to the middle of the white water tower.

4. The paper machine flow forming device according to claim 1, characterized in that, The first pressure screen is an internal flow slotted screen with a screen slot size of 0.2~0.5 mm; the second pressure screen is an internal flow perforated screen with a screen aperture size of 1~2 mm.

5. A paper machine flow forming device according to claim 1, characterized in that, The bottom of the molded mesh is provided with a white water channel, which is connected to the top of the white water tower.

6. The paper machine flow forming device according to claim 1, characterized in that, It also includes a cleaner, which includes a cleaning pipe disposed on two cleaning support plates, and the cleaning pipe is provided with a plurality of nozzle groups along its length, the nozzle groups including a plurality of nozzles disposed on the cleaning pipe along its circumferential direction.

7. A paper machine flow forming device according to claim 6, characterized in that, The cleaning support plate is a right-angled trapezoid.

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