A washing device for producing paper pulp by using caragana washes biological machine pulp

Abstract

This invention relates to the field of papermaking technology and discloses a Caragana korshinskii washing device for preparing biomechanical pulp in Caragana korshinskii production. The device includes a Caragana korshinskii washing tank with first and second inclined conveyor belts on both sides and corresponding spray cleaners above. A horizontally arranged separator plate divides the tank into an upper washing zone and a lower settling zone, with filter holes evenly distributed on the plate. An air pump is located below the tank, connected to an air distribution pipe via an air inlet pipe, which is positioned below the separator plate. This device utilizes compressed air generated by the air pump to create turbulent flow to clean the Caragana korshinskii, achieving efficient removal and separation of impurities while preventing filter clogging. Simultaneously, a circulating water filter chamber enables water recycling, and a water pump and a level sensor work together to maintain a stable liquid level, solving problems such as low cleaning efficiency, incomplete impurity removal, and water waste in existing devices.

Description

Technical Field

[0001] This invention relates to the field of papermaking technology, and in particular to a washing device for producing biomechanical pulp from Caragana korshinskii. Background Technology

[0002] As an important papermaking raw material, Caragana korshinskii often has various impurities adhering to its surface during the biochemical pulping process, such as soil, sand, bark fragments, metal shavings, and weeds. If these impurities are not thoroughly removed, they will seriously affect the quality of subsequent pulping and papermaking, leading to reduced pulp brightness, decreased paper strength, and even damage to production equipment.

[0003] In existing technologies, the cleaning of plant fiber raw materials such as Caragana korshinskii typically employs either water washing or mechanical cleaning. However, traditional water washing methods often suffer from low cleaning efficiency and incomplete impurity removal, particularly for finely adhered particles and lightweight scum, which are difficult to separate effectively. While mechanical cleaning can remove some impurities, it may damage the raw materials, and its effectiveness varies depending on the form of impurities. Furthermore, existing cleaning equipment has shortcomings in impurity sedimentation, discharge, and water recycling, leading to water waste and high equipment maintenance costs. For example, some cleaning devices lack effective sediment collection and discharge mechanisms, resulting in sediment accumulation that affects cleaning effectiveness and increases cleaning difficulty; other devices do not adequately consider water recycling, resulting in high water consumption. Therefore, designing a washing device that can efficiently and thoroughly clean Caragana korshinskii raw materials while simultaneously achieving effective impurity separation and water recycling is a pressing technical problem to be solved in the field of biochemical pulp preparation. Summary of the Invention

[0004] The technical problem to be solved by this invention is that existing Caragana korshinskii washing devices suffer from low washing efficiency, incomplete removal of impurities, difficulty in cleaning sediments, and waste of water resources. To address this, we propose a Caragana korshinskii washing device for preparing pulp from biochemical mechanical pulp in Caragana korshinskii production.

[0005] To achieve the above objectives, this application adopts the following technical solution: a Caragana korshinskii washing device for preparing pulp from biochemical mechanical pulp in the production of Caragana korshinskii, comprising a Caragana korshinskii washing tank, a first inclined conveyor belt and a second inclined conveyor belt respectively arranged on both sides of the Caragana korshinskii washing tank, the output end of the first inclined conveyor belt extending below the liquid surface in the Caragana korshinskii washing tank, and the input end of the second inclined conveyor belt extending below the liquid surface in the Caragana korshinskii washing tank; a first spray cleaner is arranged at intervals above the first inclined conveyor belt along the conveying direction, and a second spray cleaner is arranged at intervals above the second inclined conveyor belt along the conveying direction, the spray angle of the first spray cleaner and the second spray cleaner are both 45°±5°, and the spray coverage completely covers the conveying surface of the corresponding conveyor belt; A horizontally installed dividing sedimentation plate divides the interior of the Caragana korshinskii washing tank into an upper washing zone and a lower sedimentation zone. The dividing sedimentation plate is evenly distributed with filter holes, each 5-8 mm in diameter, and the center-to-center distance between adjacent filter holes is 15-20 mm. An air pump with an output pressure of 0.2-0.3 MPa is installed below the Caragana korshinskii washing tank. The air pump is connected to an air inlet pipe that runs through the bottom of the washing tank and connects to at least two parallel air distribution pipes located below the dividing sedimentation plate, with a vertical distance of 10-15 cm between the air distribution pipes and the dividing sedimentation plate.

[0006] Furthermore, a sedimentation tank is provided on each side of the bottom of the Caragana washing tank. The sedimentation tank is 30-40cm deep and its inner wall is polished. Each sedimentation tank has a sedimentation outlet at the bottom, which is connected to a manual ball valve. The discharge of sediment is controlled by opening and closing the ball valve.

[0007] Furthermore, the bottom and side walls of the Caragana korshinskii washing tank are inclined towards the sedimentation tank at an angle of 3-5°. The sedimentation tank is the lowest point of the Caragana korshinskii washing tank, so as to form a guiding slope so that the sediment slides along the inclined surface and eventually accumulates in the sedimentation tank.

[0008] Furthermore, one-way exhaust valves are evenly distributed on the air distribution pipe. The air outlet direction of the one-way exhaust valve is vertically upward, and the distance between adjacent one-way exhaust valves is 20-30cm. The air outlet diameter of the one-way exhaust valve is 2-3mm, which can form bubbles with a diameter of 1-3mm. This ensures that air passes through in one direction and prevents washing water from flowing back into the air distribution pipe.

[0009] Furthermore, both the first and second inclined conveyor belts are baffle-type conveyor belts with an inclination angle of 20-25°; the height of the baffles is 5-8cm, the spacing between adjacent baffles is 10-15cm, and the baffles are perpendicular to the surface of the conveyor belt to prevent the strips from slipping during the conveying process.

[0010] Furthermore, a circulating water filter chamber is provided on one side of the Caragana washing tank. The circulating water filter chamber is connected to the Caragana washing tank through a horizontally arranged overflow pipe. A filter screen assembly is detachably installed inside the circulating water filter chamber, and the filter screen assembly is sealed to the inner wall of the circulating water filter chamber.

[0011] Furthermore, a foam overflow outlet is provided on one side of the Caragana washing tank. The foam overflow outlet is elongated and flush with the liquid surface in the washing tank, with a width of 8-10cm. The foam overflow outlet is connected to the inlet end of the overflow pipe to guide the foam on the liquid surface into the circulating water filter chamber.

[0012] Furthermore, the filter assembly is made of 304 stainless steel with a thickness of 0.5-1mm; the filter assembly has six layers of filter screen arranged in sequence along the water flow direction, with mesh sizes of 10 mesh, 20 mesh, 40 mesh, 60 mesh, 80 mesh and 100 mesh from top to bottom.

[0013] Furthermore, a first drain pipe with a diameter of 50-60mm is connected to one side of the bottom of the Caragana korshinskii washing tank, and a 100-mesh filter screen is installed at its inlet end. The first drain pipe is connected to a first circulation pump with a flow rate of 10-15m³ / h. The outlet of the first circulation pump is connected to a first return water pipe, which is connected to a first spray cleaner. A second drain pipe with the same structure as the first drain pipe is connected to the other side of the bottom of the Caragana korshinskii washing tank. The second drain pipe is connected to a second circulation pump with the same parameters as the first circulation pump. The outlet of the second circulation pump is connected to a second return water pipe, which is connected to a second spray cleaner.

[0014] Furthermore, a water replenishment pump is installed on one side of the Caragana korshinskii washing tank. The water replenishment pump is connected to a water replenishment pipe, and the output end of the water replenishment pipe extends to the side of the Caragana korshinskii washing tank away from the foam overflow port. A liquid level sensor is installed inside the Caragana korshinskii washing tank. The liquid level sensor is electrically connected to the water replenishment pump and can automatically control the start and stop of the water replenishment pump according to the liquid level to maintain the liquid level at the same level as the foam overflow port.

[0015] The technical effects and advantages of this invention are as follows: This invention discloses a washing device for producing biochemical pulp from *Caragana korshinskii* (a type of tamarisk) for papermaking. By incorporating a separating sedimentation plate within the washing tank and an air distribution pipe below, compressed air generated by an air pump creates dense turbulence in the washing zone, comprehensively agitating and cleaning the *Caragana korshinskii* raw material. This efficiently removes impurities such as mud, sand, bark fragments, metal shavings, and weeds from the surface of the *Caragana korshinskii*, significantly improving washing efficiency and thoroughness. The separating sedimentation plate divides the washing tank into an upper washing zone and a lower sedimentation zone. Coarse particles settle directly, while fine particles are carried by the water flow through the filter holes into the lower sedimentation zone, achieving preliminary separation of impurities. Simultaneously, the impact of air bubbles passing through the filter holes effectively prevents clogging, ensuring a smooth washing process. Attached Figure Description

[0016] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3This is a cross-sectional structural diagram of the present invention; Figure 4 This is a schematic diagram of the structure of the Caragana korshinskii washing tank of the present invention; Figure 5 This is a schematic cross-sectional view of the washing tank for *Caragana korshinskii* according to the present invention; Figure 6 This is a schematic diagram of the circulating water filter chamber structure of the present invention; Figure 7 This is a cross-sectional view of the circulating water filter chamber of the present invention.

[0017] Legend: 1. Caragana korshinskii washing tank; 101. Sedimentation tank; 102. Sedimentation outlet; 2. First inclined conveyor belt; 3. Second inclined conveyor belt; 4. Separating sedimentation plate; 401. Filter hole; 5. Air pump; 6. Air inlet pipe; 7. Air distribution pipe; 8. One-way exhaust valve; 9. First spray cleaner; 10. Second spray cleaner; 11. Circulating water filter chamber; 1101. Filter screen assembly; 12. Foam overflow outlet; 13. First drain pipe; 14. First circulation pump; 15. First return water pipe; 16. Second drain pipe; 17. Second circulation pump; 18. Second return water pipe; 19. Makeup water pump; 20. Makeup water pipe. Detailed Implementation

[0018] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] Example 1 Please see Figure 1 , Figure 2 and Figure 3 This invention provides a washing device for producing biochemical pulp from *Caragana korshinskii*, comprising a washing tank 1. The washing tank 1 is the main structure of the device, used to contain the washing liquid and the *Caragana korshinskii* raw material.

[0020] The washing tank 1 of *Caragana korshinskii* is equipped with a first inclined conveyor belt 2 and a second inclined conveyor belt 3 on both sides. The first inclined conveyor belt 2 is used to transport the raw *Caragana korshinskii* to be washed into the washing tank 1, and its output end extends below the liquid surface in the washing tank 1 to ensure that the raw *Caragana korshinskii* is completely immersed in the washing liquid for washing. The second inclined conveyor belt 3 is used to scoop up the washed raw *Caragana korshinskii* from the washing tank 1 and transport it to the outside, and its input end also extends below the liquid surface in the washing tank 1 to facilitate the retrieval of *Caragana korshinskii* submerged in the washing liquid.

[0021] First spray cleaners 9 are spaced apart above the first inclined conveyor belt 2 along the conveying direction, and second spray cleaners 10 are spaced apart above the second inclined conveyor belt 3 along the conveying direction. These spray cleaners are used to perform secondary rinsing on the Caragana korshinskii during its entry into and exit from the washing tank. The spray angle of both the first spray cleaner 9 and the second spray cleaner 10 is 45°±5°. This angle design ensures that the spray water acts on the surface of the Caragana korshinskii with appropriate impact force, effectively washing away residual fine impurities. At the same time, the spray coverage completely covers the conveying surface of the corresponding conveyor belt, ensuring comprehensive spray cleaning.

[0022] A horizontally arranged separating sedimentation plate 4 is installed inside the Caragana korshinskii washing tank 1. This separating sedimentation plate 4 divides the interior of the washing tank 1 into an upper washing zone and a lower sedimentation zone. The upper washing zone is mainly used for soaking and aerating the Caragana korshinskii raw materials, while the lower sedimentation zone is used to collect the settled impurities. The separating sedimentation plate 4 has evenly distributed filter holes 401, each with a diameter of 5-8 mm and a center-to-center distance of 15-20 mm between adjacent filter holes 401. These filter holes 401 allow washing water and fine impurities to pass through, while preventing larger particles of Caragana korshinskii raw materials from entering the lower sedimentation zone, thus achieving preliminary separation of coarse and fine impurities.

[0023] An air pump 5 is installed below the Caragana korshinskii washing tank 1. The air pump 5 has an outlet pressure of 0.2-0.3 MPa, which provides sufficient power to form an effective bubble flow of compressed air in the cleaning liquid. The air pump 5 is connected to an air inlet pipe 6, which runs through the bottom of the Caragana korshinskii washing tank 1 and is connected to at least two parallel air distribution pipes 7. The air distribution pipes 7 are located below the separating sedimentation plate 4, and the vertical distance between the air distribution pipes 7 and the separating sedimentation plate 4 is 10-15 cm. When the air pump 5 is working, compressed air enters the air distribution pipes 7 through the air inlet pipe 6 and is discharged from the air distribution pipes 7 to form bubbles. These bubbles pass through the filter holes 401 of the separating sedimentation plate 4 as they rise, forming dense turbulence in the upper cleaning zone, which agitates and cleans the Caragana korshinskii raw material from all directions, thereby effectively removing impurities such as mud, sand, bark fragments, metal shavings, and weeds attached to its surface. Meanwhile, the impact force generated when the bubbles pass through the filter hole 401 helps prevent the filter hole 401 from being clogged by impurities, ensuring the continuity of the cleaning process.

[0024] In practice, when the raw material of *Caragana korshinskii* is conveyed to the washing tank 1 via the first inclined conveyor belt 2 and sent to the upper cleaning zone below the liquid surface through the conveyor belt output end, the air pump 5 starts and delivers compressed air to the air distribution pipe 7 through the air inlet pipe 6. The air is discharged through the one-way exhaust valve 8 on the air distribution pipe 7, forming bubbles with a diameter of 1-3 mm. These bubbles move vertically upward, pass through the filter holes 401 of the separating sedimentation plate 4, and form dense turbulence in the cleaning zone, which thoroughly disturbs and cleans the raw material of *Caragana korshinskii*, effectively removing impurities such as mud, sand, bark fragments, metal shavings, and weeds attached to the surface of the *Caragana korshinskii*. Among the impurities generated during cleaning, coarse particles with a diameter larger than that of the filter holes 401 settle directly under gravity and slide along the 3-5° inclined surface at the bottom of the washing tank 1 to the sedimentation tank 101. Fine particles with a diameter smaller than that of the filter holes 401 are carried by the water flow through the filter holes 401 into the lower sedimentation zone and eventually accumulate in the sedimentation tank 101, which can be periodically discharged through the manual ball valve of the sedimentation outlet 102. Simultaneously, as the bubbles pass through the filter holes 401, they impact any impurities that might clog the holes, preventing clogging. During their ascent, the bubbles drive the water flow in the washing zone, creating circulation and causing impurities far from the bubble area to move towards the separating sedimentation plate 4, accelerating impurity separation. After the Caragana korshinskii raw material is washed in the washing zone, it is scooped up by the input end of the second inclined conveyor belt 3 and transported outside the washing tank. As the Caragana korshinskii enters and leaves the washing tank, the first spray cleaner 9 and the second spray cleaner 10 perform multi-stage spray rinsing.

[0025] Example 2 Based on Embodiment 1, this embodiment optimizes the bottom structure of the Caragana korshinskii washing tank 1.

[0026] Please see Figure 3 , Figure 4 and Figure 5 The washing tank 1 for *Caragana korshinskii* has a sedimentation tank 101 on each side of its bottom. The sedimentation tank 101 is 30-40 cm deep, sufficient to hold a certain amount of sediment and reduce cleaning frequency. Its inner wall is polished, which reduces friction between the sediment and the tank wall, making it easier for the sediment to slide to the bottom and be discharged. Each sedimentation tank 101 has a sediment discharge outlet 102 at its bottom, connected to a manual ball valve. The opening and closing of the ball valve controls the discharge of sediment. The manual ball valve is simple in structure, easy to operate, and effectively controls the discharge of sediment.

[0027] Furthermore, the bottom and side walls of the Caragana korshinskii washing tank 1 are inclined towards the sedimentation tank 101 at an angle of 3-5°. The sedimentation tank 101 is the lowest point of the Caragana korshinskii washing tank 1, forming a guiding slope so that the sediment slides along the inclined surface and eventually accumulates in the sedimentation tank 101. This inclined design utilizes gravity to guide the sedimented impurities to automatically collect in the sedimentation tank 101, greatly improving the impurity collection efficiency and reducing the labor intensity of manual cleaning.

[0028] Furthermore, one-way exhaust valves 8 are evenly distributed on the air distribution pipe 7. The air outlet direction of the one-way exhaust valves 8 is vertically upward, and the distance between adjacent one-way exhaust valves 8 is 20-30cm. The air outlet diameter of the one-way exhaust valve 8 is 2-3mm, which can form bubbles with a diameter of 1-3mm. This ensures one-way air passage and prevents washing water from flowing back into the air distribution pipe 7. The one-way exhaust valves 8 ensure uniform distribution and stable discharge of bubbles, while effectively preventing washing water backflow and contamination of the air pump and pipes, thus improving the reliability of the system.

[0029] Both the first inclined conveyor belt 2 and the second inclined conveyor belt 3 are baffle-type conveyor belts with an inclination angle of 20-25°. The height of the baffles is 5-8cm, the spacing between adjacent baffles is 10-15cm, and the baffles are perpendicular to the surface of the conveyor belt to prevent the Caragana korshinskii from slipping during transport. The baffle-type conveyor belt and the appropriate inclination angle effectively prevent the Caragana korshinskii raw material from slipping due to wetness during transport, ensuring the stability and continuity of the transport.

[0030] Example 3 Based on Examples 1 and 2, this example further optimizes the recycling of cleaning water and the liquid level control mechanism.

[0031] Please see Figure 6 and Figure 7A circulating water filter chamber 11 is provided on one side of the Caragana korshinskii washing tank 1. The circulating water filter chamber 11 is connected to the Caragana korshinskii washing tank 1 through a horizontally arranged overflow pipe. A filter screen assembly 1101 is detachably installed inside the circulating water filter chamber 11, and the filter screen assembly 1101 is sealed to the inner wall of the circulating water filter chamber 11. This design allows the washing water containing fine impurities generated during the washing process to enter the filter chamber for purification through the overflow pipe.

[0032] A foam overflow outlet 12 is provided on one side of the Caragana korshinskii washing tank 1. The foam overflow outlet 12 is elongated and flush with the liquid surface in the washing tank, with a width of 8-10 cm. The foam overflow outlet 12 is connected to the inlet end of the overflow pipe and is used to guide the foam on the liquid surface into the circulating water filter chamber 11. When the bubbles generated by aeration carry some light impurities to the liquid surface and form foam, this foam will enter the circulating water filter chamber 11 through the foam overflow outlet 12, which is flush with the liquid surface, thereby achieving effective removal of foam.

[0033] The filter assembly 1101 is made of 304 stainless steel with a thickness of 0.5-1mm. 304 stainless steel has excellent corrosion resistance, ensuring the service life of the filter assembly 1101. The filter assembly 1101 has six layers of filter screens arranged sequentially along the water flow direction, with mesh sizes of 10, 20, 40, 60, 80, and 100 meshes from top to bottom. This multi-layered, progressively denser filter design can finely filter impurities in the washing water, ensuring that the purified water meets the requirements for recycling and achieving efficient water resource recycling.

[0034] A first drain pipe 13 with a diameter of 50-60 mm is connected to one side of the bottom of the Caragana korshinskii washing tank 1, and its inlet end is equipped with a 100-mesh filter. The first drain pipe 13 is connected to a first circulation pump 14 with a flow rate of 10-15 m³ / h. The outlet of the first circulation pump 14 is connected to a first return water pipe 15, which is connected to a first spray cleaner 9. A second drain pipe 16 with the same structure as the first drain pipe 13 is connected to the other side of the bottom of the Caragana korshinskii washing tank 1. The second drain pipe 16 is connected to a second circulation pump 17 with the same parameters as the first circulation pump 14. The outlet of the second circulation pump 17 is connected to a second return water pipe 18, which is connected to a second spray cleaner 10. This dual-circuit pump and drain pipe design ensures that the cleaning water required by the spray cleaner can be drawn from the bottom of the washing tank and recycled, further improving water resource utilization efficiency.

[0035] A water replenishment pump 19 is installed on one side of the Caragana korshinskii washing tank 1. The water replenishment pump 19 is connected to a water replenishment pipe 20, and the output end of the water replenishment pipe 20 extends into the Caragana korshinskii washing tank 1 to the side away from the foam overflow port 12. A liquid level sensor 21 is installed in the Caragana korshinskii washing tank 1. The liquid level sensor 21 is electrically connected to the water replenishment pump 19 and can automatically control the start and stop of the water replenishment pump 19 according to the liquid level to maintain the liquid level at the foam overflow port 12. The linkage control of the liquid level sensor 21 and the water replenishment pump 19 can monitor and automatically adjust the liquid level in the washing tank in real time. When the liquid level drops below the set value due to evaporation or overflow, the water replenishment pump 19 is automatically started to replenish water, ensuring that the liquid level is stable at the same level as the foam overflow port 12. This ensures the stability of the cleaning and foam overflow effect and improves the automation level and operational reliability of the device.

[0036] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A washing apparatus for producing biomechanical pulp from *Caragana korshinskii*, characterized in that, The system includes a Caragana korshinskii washing tank, with a first inclined conveyor belt and a second inclined conveyor belt respectively arranged on both sides of the washing tank. The output end of the first inclined conveyor belt extends below the liquid surface in the washing tank, and the input end of the second inclined conveyor belt extends below the liquid surface in the washing tank. A first spray cleaner is arranged at intervals above the first inclined conveyor belt along the conveying direction, and a second spray cleaner is arranged at intervals above the second inclined conveyor belt along the conveying direction. The spray angle of the first spray cleaner and the second spray cleaner is 45°±5°, and the spray coverage area completely covers the conveying surface of the corresponding conveyor belt. A horizontally arranged dividing sedimentation plate is installed inside the Caragana korshinskii washing tank, dividing the interior of the tank into an upper washing area and a lower sedimentation area; filter holes are evenly distributed on the dividing sedimentation plate; an air pump is installed below the Caragana korshinskii washing tank, and the air pump is connected to an air inlet pipe, which passes through the bottom of the Caragana korshinskii washing tank and is connected to at least two parallel air distribution pipes, which are located below the dividing sedimentation plate.

2. The *Caragana korshinskii* washing device for producing biochemical mechanical pulp and preparing paper pulp according to claim 1, characterized in that, Each of the two sides of the bottom of the Caragana washing tank is provided with a sedimentation tank, and each sedimentation tank has a sedimentation outlet at the bottom, which is connected to a manual ball valve.

3. The *Caragana korshinskii* washing device for producing biochemical mechanical pulp and preparing paper pulp according to claim 2, characterized in that, The bottom and side walls of the Caragana korshinskii washing tank are inclined toward the sedimentation tank, which is the lowest point of the Caragana korshinskii washing tank.

4. The *Caragana korshinskii* washing device for producing biochemical mechanical pulp and preparing paper pulp according to claim 1, characterized in that, One-way exhaust valves are evenly distributed on the air distribution pipe, and the air outlet direction of the one-way exhaust valves is vertically upward.

5. The *Caragana korshinskii* washing device for producing biochemical mechanical pulp and preparing paper pulp according to claim 1, characterized in that, Both the first and second inclined conveyor belts are baffle-type conveyor belts.

6. The *Caragana korshinskii* washing apparatus for producing biomechanical pulp and preparing paper pulp according to claim 1, characterized in that, A circulating water filter chamber is provided on one side of the Caragana washing tank. The circulating water filter chamber is connected to the Caragana washing tank through a horizontally arranged overflow pipe. A filter screen assembly is detachably installed inside the circulating water filter chamber, and the filter screen assembly is sealed to the inner wall of the circulating water filter chamber.

7. The *Caragana korshinskii* washing apparatus for producing biochemical mechanical pulp and preparing paper pulp according to claim 6, characterized in that, A foam overflow outlet is provided on one side of the Caragana korshinskii washing tank. The foam overflow outlet is elongated and flush with the liquid surface in the washing tank. The foam overflow outlet is connected to the input end of the overflow pipe.

8. The *Caragana korshinskii* washing apparatus for producing biomechanical pulp and preparing paper pulp according to claim 6, characterized in that, The filter assembly is made of 304 stainless steel; the filter assembly has six layers of filter screen arranged in sequence along the water flow direction, with mesh sizes of 10 mesh, 20 mesh, 40 mesh, 60 mesh, 80 mesh and 100 mesh from top to bottom.

9. A washing device for producing biochemical pulp from *Caragana korshinskii* according to claim 6, characterized in that, A first drain pipe is connected to one side of the bottom of the Caragana korshinskii washing tank; the first drain pipe is connected to a first circulation pump, the outlet of the first circulation pump is connected to a first return water pipe, and the first return water pipe is connected to a first spray cleaner; a second drain pipe is connected to the other side of the bottom of the Caragana korshinskii washing tank, the structure of the second drain pipe is the same as that of the first drain pipe, the second drain pipe is connected to a second circulation pump, the outlet of the second circulation pump is connected to a second return water pipe, and the second return water pipe is connected to a second spray cleaner.

10. A Caragana korshinskii washing apparatus for producing biomechanical pulp and preparing paper pulp according to claim 7, characterized in that, A water replenishment pump is installed on one side of the Caragana korshinskii washing tank. The water replenishment pump is connected to a water replenishment pipe, and the output end of the water replenishment pipe extends to the side of the Caragana korshinskii washing tank away from the foam overflow port. A liquid level sensor is installed in the Caragana korshinskii washing tank. The liquid level sensor is electrically connected to the water replenishment pump and can automatically control the start and stop of the water replenishment pump according to the liquid level to maintain the liquid level at the same level as the foam overflow port.

Images