A slurry tank level regulation system and method

Abstract

The application discloses a kind of for pulp tank liquid level regulating system, it is related to papermaking pulp supply equipment technical field, including liquid level balancing device, gas supply system and pulp tank body, wherein the pulp tank body includes upper section tank body, by gas supply system in upper section tank body form certain pressure air cushion chamber to make pulp liquid surface keep at preset height, then by liquid level balancing device real-time adjustment pressure in air cushion chamber to make the height of pulp liquid surface in upper section tank body always be in the dynamic equilibrium state of small amplitude fluctuation, so that the pulp supply tank to headbox inlet pulp pressure and flow rate cannot influence process parameters in headbox inside;The application also discloses a kind of for pulp tank liquid level regulating method can automatically by liquid level balancing device adjust the liquid level of pulp in pulp tank, to realize dynamic balance for external pulp supply, only need to adjust before starting, without always paying attention.

Description

Technical Field

[0001] The present invention relates to the technical field of papermaking pulp supply equipment, and in particular to a pulp supply tank liquid level regulating system and method. Background Art

[0002] Paper refers to sheet-like fiber products used for writing, printing, painting or packaging. With the changes of the times, people's demand for paper and the way of demand are constantly changing, and paper product production and processing equipment are also being updated synchronously. The headbox is a key device of the papermaking machine and plays a key role in producing high-quality paper sheets.

[0003] The pulp supply device in the headbox of an existing papermaking machine adopts a sealed tank structure, and the pulp filled inside it cannot be directly observed and accurately controlled. This makes it difficult to control the pulp supply pressure and pulp supply speed of the internal pulp. The pulp inlet pressure and flow rate from the pulp supply tank to the headbox will affect the process parameters inside the headbox. The stability of the process parameters inside the headbox has a great influence on the longitudinal basis weight of the paper, and will affect important parameters such as the pulp speed and pulp quality sprayed from the pulp outlet of the headbox onto the mesh surface.

[0004] Therefore, it is particularly necessary to provide a system that can adjust the liquid level of the pulp stock solution in the pulp supply tank in real time. Summary of the Invention

[0005] The purpose of the present invention is to provide a slurry supply tank liquid level regulation system and method, which forms an air cushion chamber with a certain pressure in the upper tank body through the air supply system to keep the slurry liquid level at a preset height, and then adjusts the pressure in the air cushion chamber in real time through the liquid level balance device so that the slurry liquid level in the upper tank body is always in a dynamic equilibrium state with small fluctuations, so that the slurry inlet pressure and flow rate from the slurry supply tank to the slurry headbox will not affect the process parameters inside the slurry headbox.

[0006] In order to achieve the above technical objectives, the present invention is implemented through the following technical solutions:

[0007] A slurry supply tank liquid level adjustment system, comprising:

[0008] Liquid level balancing device;

[0009] Gas supply system;

[0010] The slurry supply tank body includes an upper tank body, the top of the inner cavity of the upper tank body is connected to the air supply system to form an air cushion chamber with a certain pressure, and the inner cavity side wall of the upper tank body is connected to the liquid level balancing device. The liquid level balancing device adjusts the pressure in the air cushion chamber to make the liquid level of the upper tank body in a dynamic equilibrium state with small fluctuations.

[0011] In this solution, an air cushion chamber is first formed at the top of the inner cavity of the upper tank through the air supply system. The pressure in the air cushion chamber is the same as the required slurry inlet pressure. The liquid level balance device is then adjusted to the preset parameters. When the slurry is supplied too quickly, the liquid level rises, increasing the pressure in the air cushion chamber, which in turn squeezes the slurry and lowers the liquid level back to the preset position. Conversely, when the liquid level drops, the pressure in the air cushion chamber decreases, and slurry is promptly replenished in the upper tank, causing the liquid level to rise. The liquid level typically fluctuates significantly only when discharging and stopping the material. During normal production, the liquid level always remains in a dynamic equilibrium state with small fluctuations. Finally, the slurry at the predetermined pressure is steadily delivered, ensuring that the slurry inlet pressure and flow rate from the slurry supply tank to the headbox do not affect the process parameters within the headbox.

[0012] As a further technical solution of the slurry supply tank liquid level adjustment system, the liquid level balancing device includes an overflow controller and an overflow pipe, one end of the overflow pipe is connected to the inner cavity side wall of the upper tank body, and the other end is connected to the overflow controller;

[0013] The overflow controller includes a hollow exhaust pipe, which passes through the inner cavity of the overflow pipe. An overflow hole connected to the hollow cavity is provided on the outer wall of the inner cavity of the overflow pipe. The lower end of the exhaust pipe is connected to the atmospheric environment, and the pressure in the air cushion chamber is adjusted through the overflow hole, thereby achieving the purpose of dynamically adjusting the slurry liquid level.

[0014] As a further technical solution of the slurry supply tank liquid level adjustment system, the overflow hole is arranged in a long strip shape along the axis of the exhaust pipe. The long strip overflow hole allows the liquid level balancing device to have a larger adjustment range, thereby reducing the fluctuation of the slurry liquid level.

[0015] As a further technical solution of the slurry supply tank liquid level adjustment system, the exhaust pipe moves up and down along its own axis through the movable part, further improving the adjustment range of the liquid level balancing device.

[0016] As a further technical solution of the slurry supply tank liquid level adjustment system, a hand wheel is connected to the top of the exhaust pipe, and the exhaust pipe is connected to the overflow pipe through a threaded connection. The threaded lifting structure facilitates the adjustment of the height setting parameters of the slurry liquid level.

[0017] As a further technical solution of the slurry supply tank liquid level adjustment system, the upper end of the exhaust pipe is connected to the output end of the stepping motor.

[0018] As a further technical scheme of the slurry tank liquid level adjusting system, the inner cavity side wall surface of the upper tank body is provided with a pressure sensor, the pressure sensor is electrically connected with the stepping motor, the pressure in the air cushion chamber is detected through the pressure sensor, and then the slurry liquid level is confirmed, and the height of the overflow hole is automatically adjusted through the stepping motor, so that the height setting parameter of the slurry liquid level is quickly adjusted.

[0019] As a further technical scheme of the slurry tank liquid level adjusting system, the gas supply system comprises a gas storage tank for storing compressed air, and the gas inlet pipe and the gas outlet pipe of the gas storage tank are respectively connected with a pressure reducing valve, so as to reduce the pressure fluctuation amplitude of the compressed gas in the air cushion chamber, and further reduce the fluctuation amplitude of the slurry liquid level in the slurry tank.

[0020] A slurry tank liquid level adjusting method adopts one of the slurry tank liquid level adjusting systems in the above technical schemes, and the liquid level adjusting step comprises:

[0021] S1. The predetermined pressure compressed air is introduced into the upper tank body through the gas supply system, the air cushion chamber with a certain pressure is formed at the top of the upper tank body, and the slurry liquid surface in the upper tank body is kept within the diameter range of the overflow pipeline;

[0022] S2. The height of the overflow hole in the overflow pipeline is adjusted in advance, so that the slurry liquid surface is located in the middle position of the overflow hole;

[0023] S3. The liquid level of the slurry in the upper tank body is automatically adjusted through the overflow hole, so that the external slurry supply realizes dynamic balance.

[0024] The specific adjustment mode of the slurry liquid surface position in the step S2 is that when the slurry liquid surface in the upper tank body is not completely higher than the overflow hole, the compressed air in the air cushion chamber is discharged through the overflow hole; when the slurry liquid surface in the upper tank body is completely higher than the overflow hole, the compressed air in the air cushion chamber cannot be discharged, the pressure becomes larger and larger, and at the same time, the slurry liquid surface is gradually pressed downward until the slurry liquid surface is lowered to the preset position.

[0025] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0026] In summary, the present application provides a slurry tank liquid level adjusting system, which comprises a liquid level balancing device, a gas supply system and a slurry tank body, wherein the slurry tank body comprises an upper tank body, a gas cushion chamber with a certain pressure is formed in the upper tank body through the gas supply system, so that the slurry liquid surface is kept at a preset height, and then the pressure in the air cushion chamber is adjusted in real time through the liquid level balancing device, so that the height of the slurry liquid surface in the upper tank body is always in a small-amplitude fluctuation dynamic balance state, thereby the slurry inlet pressure and flow rate from the slurry tank to the headbox do not affect the process parameters in the headbox.

[0027] The present invention provides a method for regulating the liquid level of a slurry supply tank, which can automatically regulate the liquid level of the slurry in the slurry supply tank through a liquid level balancing device, so that the external slurry supply can achieve dynamic balance. The method only needs to be adjusted before starting the machine, and no constant attention is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0029] Figure 1 A schematic structural diagram of a slurry supply tank liquid level adjustment system provided in Example 1 of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure marked AA;

[0031] Figure 3 A schematic structural diagram of a slurry supply tank liquid level adjustment system provided in Example 2 of the present invention;

[0032] Figure 4 It is a structural diagram of the liquid level balancing device.

[0033] Markings and corresponding parts names in the accompanying drawings:

[0034] 1-air supply system, 2-air cushion chamber, 3-handwheel, 4-upper tank body, 5-overflow controller, 6-overflow pipe, 7-slurry discharge pipe, 8-pressure sensor, 10-lower tank body, 11-exhaust pipe, 12-overflow hole, 13-sealing end. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0036] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0037] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0039] Example 1

[0040] This embodiment 1 provides a slurry tank level adjustment system, such as Figure 1 As shown, it includes a liquid level balancing device, an air supply system 1 and a slurry supply tank body, wherein the slurry supply tank body includes an upper tank body 4 and a lower tank body 10, and slurry is poured into the slurry supply tank body from the bottom of the lower tank body 10, and an air cushion chamber 2 with a certain pressure is formed at the top of the inner cavity of the upper tank body 4 and is connected to the air supply system 1. The bottom of the inner cavity of the upper tank body 4 is connected to a slurry outlet pipe 7 for outputting slurry. In this embodiment, the pressure of the air cushion chamber 2 is the same as the required slurry inlet pressure and is set as needed, and the inner cavity side wall of the upper tank body 4 is connected to the liquid level balancing device, and an air cushion chamber 2 with a certain pressure is formed in the upper tank body 4 through the air supply system 1, so that the slurry liquid level is maintained at a preset height, and then the pressure in the air cushion chamber 2 is adjusted in real time by the liquid level balancing device, so that the slurry liquid level in the upper tank body 4 is always in a dynamic equilibrium state with small fluctuations.

[0041] See Figure 1 and Figure 3As shown, the liquid level balancing device includes an overflow controller 5 and an overflow pipe 6, wherein one end of the overflow pipe 6 is connected to the inner cavity side wall of the upper tank body 4, and the other end is a sealed end 13 and connected to the overflow controller 5. Specifically, the overflow controller 5 includes a hollow exhaust pipe 11, the exhaust pipe 11 passes through the inner cavity of the overflow pipe 6, and an overflow hole 12 communicating with the hollow cavity is provided on the outer side wall of the inner cavity part of the overflow pipe 6 on the exhaust pipe 11. The upper end of the exhaust pipe 11 is a sealed end, and the lower end of the exhaust pipe 11 is connected to the atmosphere and is located at the return line. Above the collection tank 14, the upper part of the recovery tank 14 is connected to the atmosphere, and the lower part is connected to the recovery filtration system. The slurry overflowing from the overflow hole 12 flows to the white water tank 14, enters the recovery filtration system, and is then transported back to the slurry supply tank body after filtration. Therefore, the pressure in the air cushion chamber 2 can be adjusted through the overflow hole 12, thereby achieving the purpose of dynamically adjusting the slurry liquid level height. In this embodiment, the overflow hole 12 is arranged in a long strip along the axis of the exhaust pipe 11. The long overflow hole 12 gives the liquid level balancing device a larger adjustment range, thereby reducing the fluctuation of the slurry liquid level.

[0042] In order to further improve the adjustment range of the liquid level balancing device, the above-mentioned exhaust pipe 11 moves up and down along its own axis through the movable part. Specifically, the handwheel 3 is connected to the top of the exhaust pipe 11, and the exhaust pipe 11 is connected to the overflow pipe 6 through a threaded connection. The threaded lifting structure facilitates the adjustment of the height setting parameters of the slurry liquid level.

[0043] Working principle: First, the air supply system forms an air cushion chamber 2 at the top of the inner cavity of the upper tank body 4. Then, the overflow hole 12 is adjusted to the required height using the handwheel 3, so that the slurry liquid level is in the middle of the overflow hole 12. When the slurry is supplied too quickly, the liquid level will rise, the space connecting the compressed air and the overflow hole 12 will become smaller, the gas discharge rate will decrease, and the pressure in the air cushion chamber 2 will increase, which in turn squeezes the slurry and lowers the liquid level back to the preset position. Conversely, when the liquid level drops, the space connecting the compressed air and the overflow hole 12 will become larger, the gas discharge rate will increase, and the pressure of the air cushion 2 will decrease, allowing slurry to be replenished in time to the upper tank body 4, causing the liquid level to rise. Usually, the liquid level will only fluctuate significantly when discharging and stopping the material supply. In normal production, the liquid level always remains in a dynamic equilibrium state with small fluctuations. Finally, the slurry at the predetermined pressure is smoothly transported out, so that the slurry inlet pressure and flow rate from the slurry supply tank to the slurry headbox meet the process parameters required by the slurry headbox.

[0044] Example 2

[0045] This embodiment 2 provides another slurry tank level adjustment system, such as Figure 2 and Figure 3As shown, it includes a liquid level balancing device, an air supply system 1 and a slurry supply tank body, wherein the slurry supply tank body includes an upper tank body 4 and a lower tank body 10, slurry is poured into the slurry supply tank body from the bottom of the lower tank body 10, and the top of the inner cavity of the upper tank body 4 is connected to the air supply system 1 to form an air cushion chamber 2 with a certain pressure. In order to reduce the pressure fluctuation amplitude of the compressed gas in the air cushion chamber 2, the above-mentioned air supply system 1 includes an air storage tank for storing compressed air, and the air inlet pipe and the air outlet pipe of the air storage tank are respectively connected to a pressure reducing valve. At the same time, the upper The bottom of the inner cavity of the section tank body 4 is connected to the slurry outlet pipe 7 for outputting the slurry. In this embodiment, the pressure of the air cushion chamber 2 is the same as the required slurry inlet pressure and is set according to needs. The inner cavity side wall of the upper tank body 4 is connected to the liquid level balancing device. The air cushion chamber 2 with a certain pressure is formed in the upper tank body 4 through the air supply system 1 to keep the slurry liquid level at a preset height. The pressure in the air cushion chamber 2 is then adjusted in real time through the liquid level balancing device to keep the slurry liquid level in the upper tank body 4 in a dynamic equilibrium state with small fluctuations.

[0046] See Figure 2 and Figure 3 As shown, the liquid level balancing device includes an overflow controller 5 and an overflow pipe 6, wherein one end of the overflow pipe 6 is connected to the inner cavity side wall of the upper tank body 4, and the other end is a sealed end 13 (i.e., a sealed and airtight structure) and is connected to the overflow controller 5. Specifically, the overflow controller 5 includes a hollow exhaust pipe 11, which passes through the inner cavity of the overflow pipe 6. An overflow hole 12 communicating with the hollow cavity is provided on the outer side wall of the inner cavity part of the overflow pipe 6 on the exhaust pipe 11. The upper end of the exhaust pipe 11 is a sealed end, and the lower end of the exhaust pipe 11 is connected to the inner cavity of the overflow pipe 6. It is connected to the atmosphere and is located above the recovery tank 14. The upper part of the recovery tank 14 is connected to the atmosphere, and the lower part is connected to the recovery filtration system. The slurry overflowing from the overflow hole 12 flows to the white water tank 14, enters the recovery filtration system, and is then transported back to the slurry supply tank body after filtration. The pressure in the air cushion chamber 2 is adjusted by the overflow hole 12 to achieve the purpose of dynamically adjusting the slurry liquid level. In this embodiment, the overflow hole 12 is arranged in a long strip along the axis of the exhaust pipe 11. The long overflow hole 12 gives the liquid level balancing device a larger adjustment range, thereby reducing the fluctuation of the slurry liquid level.

[0047] In order to further improve the adjustment range of the liquid level balancing device, the above-mentioned exhaust pipe 11 moves up and down along its own axis through the movable part. Specifically, the upper end of the exhaust pipe 11 is connected to the output end of the stepper motor, and the inner cavity side wall of the upper tank body 4 is provided with a pressure sensor 8. In this embodiment, the pressure sensor 8 or other detection sensor can also be arranged on the inner side of the sealing end 13. The pressure sensor 8 is electrically connected to the stepper motor. The pressure in the air cushion chamber 2 is detected by the pressure sensor 8 to confirm the slurry liquid level. When a sharp change in the pressure in the air cushion chamber 2 is detected, the height of the overflow hole 12 is automatically adjusted by the stepper motor, thereby quickly adjusting the height setting parameters of the slurry liquid level.

[0048] Example 3

[0049] This embodiment 3 provides a liquid level adjustment method using the slurry supply tank liquid level adjustment system of the above embodiment, wherein the liquid level adjustment steps include:

[0050] S1. Compressed air at a predetermined pressure is introduced into the upper tank 4 through the air supply system 1, forming an air cushion chamber 2 with a certain pressure at the top of the upper tank, so that the slurry level in the upper tank 4 is maintained within the diameter of the overflow pipe 6;

[0051] S2. Pre-adjust the height of the overflow hole 12 in the overflow pipe 6 so that the slurry liquid level is in the middle position of the overflow hole 12.

[0052] The specific adjustment method of the slurry liquid level position is: when the slurry liquid level in the upper tank body 4 is not completely higher than the overflow hole 12, the compressed air in the air cushion chamber 2 is discharged through the overflow hole 12; when the slurry liquid level in the upper tank body 4 is completely higher than the overflow hole 12, the compressed air in the air cushion chamber 2 cannot be discharged, and the pressure will become greater and greater, and at the same time, the slurry liquid level will gradually be squeezed downward until the slurry liquid level drops to the preset position.

[0053] S3. The liquid level of the slurry in the upper tank 4 is automatically adjusted through the overflow hole 12 to achieve dynamic balance in the external slurry supply.

[0054] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A slurry supply tank liquid level adjustment system, characterized in that: include: Liquid level balancing device; Gas supply system (1); A slurry supply tank body, the slurry supply tank body comprising an upper tank body (4), the inner cavity top of the upper tank body (4) being connected to the air supply system (1) to form an air cushion chamber (2) with a certain pressure, the inner cavity side wall of the upper tank body (4) being connected to the liquid level balancing device, and the liquid level balancing device adjusting the pressure in the air cushion chamber (2) to keep the liquid level of the upper tank body (4) in a dynamic equilibrium state with small fluctuations; The liquid level balancing device comprises an overflow controller (5) and an overflow pipe (6), one end of the overflow pipe (6) is in communication with the inner cavity side wall of the upper tank body (4), and the other end is connected to the overflow controller (5); The overflow controller (5) comprises a hollow exhaust pipe (11), the exhaust pipe (11) passing through the inner cavity of the overflow pipe (6), an overflow hole (12) communicating with the hollow cavity is provided on the outer wall of the exhaust pipe (11) located in the inner cavity of the overflow pipe (6), and the lower end of the exhaust pipe (11) is communicated with the atmospheric environment.

2. A slurry supply tank liquid level adjustment system according to claim 1, characterized in that: The overflow hole (12) is arranged in a long strip shape along the axis of the exhaust pipe (11).

3. A slurry supply tank liquid level adjustment system according to claim 2, characterized in that: The exhaust pipe (11) moves up and down along its own axis through the movable portion.

4. A slurry supply tank liquid level adjustment system according to claim 3, characterized in that: A hand wheel (3) is connected to the top of the exhaust pipe (11), and the exhaust pipe (11) is connected to the overflow pipe (6) via threads.

5. The slurry supply tank liquid level adjustment system according to claim 3, characterized in that: The upper end of the exhaust pipe (11) is connected to the output end of the stepping motor.

6. A slurry supply tank liquid level adjustment system according to claim 5, characterized in that: A pressure sensor (8) is provided on the inner wall surface of the upper tank body (4), and the pressure sensor (8) is electrically connected to the stepping motor.

7. The slurry supply tank liquid level adjustment system according to claim 1, characterized in that: The air supply system (1) comprises an air storage tank for storing compressed air, wherein an air inlet pipe and an air outlet pipe of the air storage tank are respectively connected to a pressure reducing valve.

8. A method for regulating the liquid level of a slurry supply tank, characterized in that: A slurry supply tank liquid level adjustment system according to any one of claims 4 to 6 is used, wherein the liquid level adjustment step comprises: S1. Compressed air of a predetermined pressure is introduced into the upper tank body (4) through the air supply system (1), forming an air cushion chamber (2) with a certain pressure on the top of the upper tank body (4), so that the slurry liquid level in the upper tank body (4) is maintained within the diameter range of the overflow pipe (6); S2. Pre-adjust the height of the overflow hole (12) in the overflow pipe (6) so that the slurry liquid level is in the middle of the overflow hole (12); S3. Automatically adjust the liquid level of the slurry in the upper tank (4) through the overflow hole (12) to achieve dynamic balance of the slurry supply to the outside.

9. A method for adjusting the liquid level of a slurry supply tank according to claim 8, characterized in that: The specific adjustment method of the slurry liquid level position in step S2 is as follows: when the slurry liquid level in the upper tank body (4) is not completely higher than the overflow hole (12), the compressed air in the air cushion chamber (2) is discharged through the overflow hole (12); when the slurry liquid level in the upper tank body (4) is completely higher than the overflow hole (12), the compressed air in the air cushion chamber (2) cannot be discharged, the pressure will become greater and greater, and the slurry liquid level will gradually be squeezed downward until the slurry liquid level is lowered to a preset position.

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