Papermaking pulp shoving process

Abstract

The invention relates to the technical field of papermaking, in particular to a papermaking pulp shoving process. Comprising the following steps: (1) cleaning and disinfecting various sheets containing wood fibers, and soaking the sheets with ozone water; (2) grinding the soaked sheet material into coarse pulp by using a pulping machine, washing the coarse pulp with water, putting the washed coarse pulp into an aquatic biological catalysis tank, refluxing the water for washing the coarse pulp into the biological catalysis tank, adding a biological catalyst into the biological catalysis tank, and performing biological catalysis and degradation on the coarse pulp in the biological catalysis tank; and (3) finely grinding the catalyzed and degraded coarse pulp into fine pulp, bleaching, concentrating the bleached fine pulp, and shoving by using a shoving machine. The water after washing the coarse pulp flows back to the biological catalysis tank, and the water after washing the coarse pulp is matched with a biological catalyst to carry out biological catalysis and degradation on the coarse pulp, so that the water consumption can be reduced, and the production cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of papermaking technology, and specifically to a pulp squeezing process for papermaking. Background Art

[0002] In the papermaking industry, the pulp squeezing process is a key link that determines fiber separation efficiency, energy consumption, and water resource consumption. Traditional squeezing technologies mostly adopt the method of mechanical pressing combined with filter screen separation, but generally have problems such as low water resource utilization rate, easy accumulation of solid by-products, and difficult equipment cleaning. Especially in the primary pulp treatment stage, the washing water is often directly discharged or needs to be recycled and treated multiple times, resulting in high water consumption costs. Although the application of biological catalytic degradation technology can partially reduce the dependence on chemical reagents, the separation design of the washing water and the catalytic system still makes it difficult to achieve closed-loop reuse of water resources, causing a large amount of fresh water consumption.

[0003] At the level of squeezing equipment, a conventional screw extruder realizes the separation of slurry through the cooperation of a conical screw and a filter cylinder. However, during the advancement of the pulp, fiber caking is easily formed due to uneven local pressure, resulting in filter hole blockage and frequent shutdowns for cleaning. In addition, when the solid by-products are discharged, they are easily attached to the equipment outlet. Manual intervention for cleaning is not only inefficient but also poses a risk of slurry residue breeding bacteria. Although attempts have been made in the prior art to improve the cleaning effect by adding a spray system or a vibration device, the structure is complex and it is difficult to cooperate with the extrusion action. Often, due to insufficient water pressure or mechanical interference, the cleaning is not thorough, which instead increases energy consumption and maintenance costs.

[0004] Therefore, there is an urgent need for a squeezing process and equipment that integrates efficient water circulation, dynamic self-cleaning, and low-resistance slag discharge functions to break through the high water consumption bottleneck of traditional technologies, while improving production continuity and equipment stability to meet the sustainable development needs of green papermaking. Summary of the Invention

[0005] The main object of the present invention is to provide a pulp squeezing process for papermaking that can reduce water consumption and thus reduce production costs.

[0006] To achieve the above object, the technical solution provided by the present invention is as follows: A pulp squeezing process for papermaking, comprising the following steps: (1) Cleaning and disinfecting various sheet materials containing wood fibers, and then soaking them in ozone water.

[0007] (2) Grinding the soaked sheet materials into primary pulp using a refiner. After washing the primary pulp with water, put it into a water biological catalytic pool. The water for washing the primary pulp is returned to the biological catalytic pool, and a biological catalyst is added to the biological catalytic pool. The primary pulp undergoes biological catalysis and degradation in the biological catalytic pool.

[0008] (3) Grind the coarsely pulped material after catalysis and degradation into fine pulp and then bleach it. After the bleached fine pulp is concentrated, it is squeezed by a squeezing machine.

[0009] The squeezing machine includes a box body. A liquid discharge hole is opened at the lower end of the box body. A filter cylinder is fixed inside the box body. A fixed cylinder is fixed at the left end of the filter cylinder. A feed port is arranged on the fixed cylinder. The bleached fine pulp enters the fixed cylinder through the feed port. A conical cylinder is rotatably arranged concentrically inside the filter cylinder. The diameter of the left end of the conical cylinder is smaller than that of the right end. The left end of the conical cylinder extends into the fixed cylinder. A spiral blade is fixed on the outer side of the conical cylinder. An extrusion plate is elastically slidably arranged on the right side of the box body. The extrusion plate seals and plugs the sealed end of the filter cylinder on one side thereof. A partition ring is fixed inside the left side of the fixed cylinder. An inner tube is concentrically fixedly connected to the left end of the conical cylinder. The inner tube penetrates through the partition ring, and the inner tube is movably and hermetically connected to the partition ring. A liquid cavity is formed inside the part of the fixed cylinder on the left side of the partition ring. A rotating shaft is arranged inside the liquid cavity. The left end of the rotating shaft extends to the outside of the fixed cylinder. The rotating shaft is movably and hermetically connected to the left end of the fixed cylinder. The right end of the rotating shaft is concentrically fixedly connected to the inner tube. A connecting plate is slidably arranged on the left side of the fixed cylinder. The rotating shaft penetrates through the connecting plate, and the rotating shaft is rotatably connected to the connecting plate. A motor is fixed on the connecting plate. The output shaft of the motor is concentrically fixedly connected to the rotating shaft.

[0010] Specifically, a first piston plate is rotatably and hermetically connected to the right end of the rotating shaft. The outer edge of the first piston plate is slidably and hermetically connected to the wall of the liquid cavity. The first piston plate is elastically connected to the left end of the fixed cylinder through a first spring. The liquid cavity is communicated with a connecting pipe. A first one-way valve is installed inside the connecting pipe. A plurality of sliding rods are fixed on the connecting plate. The sliding rods penetrate through the left end of the fixed cylinder and are fixed to the first piston plate. The sliding rods are slidably and hermetically connected to the left end of the fixed cylinder. A plurality of through holes are opened on the inner tube on the left side of the partition ring. The through holes communicate the inner tube and the liquid cavity. A plurality of spray holes are opened on the conical cylinder on both sides of the spiral blade. The outlet ends of the spray holes face the spiral blade. A second one-way valve is installed inside the spray holes. Thrust rods are slidably arranged in the horizontal direction on both the front and rear sides of the box body. Cylinders are fixed on both the front and rear sides of the left end of the box body. The telescopic rods of the cylinders are fixed to the thrust rods. A retaining ring is arranged between the connecting plate and the fixed cylinder. The thrust rods are fixed to the retaining ring. The left end of the retaining ring abuts tightly against the right end of the connecting plate.

[0011] Specifically, fixed blocks are fixed at both the front and rear ends of the extrusion plate. The two fixed blocks correspond to the two thrust rods respectively. The fixed blocks are located on the right side of the thrust rods. A rectangular rod is fixed to the right end of the extrusion plate. A fixing plate is slidably arranged on the rectangular rod. The fixing plate is fixed to the box body. The fixing plate and the extrusion plate are connected through a third spring.

[0012] Specifically, both the box body and the fixing plate are fixed on a frame body.

[0013] Specifically, a plurality of fixing rods are fixed on the housing of the motor. The fixing rods are fixed to the connecting plate.

[0014] Specifically, a sliding groove is formed in the cylinder wall of the fixed cylinder. The sliding groove communicates with the inside of the fixed cylinder. A gas chamber is formed in the cylinder wall of the fixed cylinder on the right side of the sliding groove. The right end of the gas chamber communicates with the outside of the fixed cylinder. An L-shaped push rod is slidably arranged in the sliding groove. The upper end of the vertical part of the push rod is located inside the fixed cylinder. The straight part of the push rod penetrates through the part of the fixed cylinder between the sliding groove and the gas chamber. The straight part of the push rod is slidably and sealingly connected with the part of the fixed cylinder between the sliding groove and the gas chamber. A second piston plate is slidably and sealingly arranged in the gas chamber. The straight part of the push rod is fixedly connected with the second piston plate. A third one-way valve is installed on the second piston plate. The right end of the second piston plate is connected with the fixed cylinder through a second spring. A trachea is fixed at the right end of the box body. The trachea is located above the right end of the filter cartridge. A plurality of air holes are formed at the lower end of the trachea. The gas chamber on the left side of the second piston plate is communicated with the trachea through a delivery pipe. A fourth one-way valve is installed on the delivery pipe. An inclined surface is formed at the left end of the spiral blade. A notch is formed at the left outer edge of the spiral blade. During the rotation of the spiral blade, under the guiding action of the inclined surface, the vertical part of the push rod can enter between the spiral blades. During the subsequent rotation of the spiral blade, the push rod can drive the second piston plate to move in the right direction. The second piston plate moves to the right and compresses the second spring. When the push rod corresponds to the notch, under the elastic force of the second spring, the push rod and the second piston plate reset.

[0015] Specifically, an inner rod is slidably arranged on the cylinder wall of the fixed cylinder on the left side of the sliding groove. The left end of the inner rod abuts against the right end of the tight resisting ring. The right end of the inner rod abuts against the vertical part of the push rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In step 1 of the present process, the sheet material is soaked in ozone water, which can efficiently sterilize while avoiding chemical residues, improving the cleanliness of the slurry and the safety of the finished product. In step 2, the washing water of the coarse pulp is returned to the biocatalytic pool, and the reuse of water is realized in cooperation with the biocatalyst, reducing the consumption of fresh water and the cost of wastewater treatment. In step 2, the biocatalyst and the returned water synergistically degrade the coarse pulp, reducing the dosage of chemical additives, which is in line with the trend of environmental protection papermaking.

[0017] 2. The structure of the conical cylinder with a smaller left side and a larger right side cooperates with the rotation of the spiral blade to form a progressive compression space, and the slurry is uniformly incrementally pressured, improving the pulp squeezing efficiency and the fiber separation effect. Gas pulse anti-blocking mechanism: The rotation of the spiral blade triggers the reciprocating movement of the push rod and the second piston plate. The gas chamber intermittently sprays high-pressure air flow into the trachea, impacting the right end of the filter cartridge to prevent the accumulation and blockage of solid by-products.

[0018] 3. Through the linkage of the first piston plate and the liquid chamber, automatic water replenishment is carried out from the external water storage tank during the cleaning stage, avoiding additional manual intervention and realizing efficient management of water resources. During cleaning, the conical cylinder and the extrusion plate intermittently collide to generate shock waves, shaking off the fiber residues attached to the spiral blade and the inner wall of the filter cartridge, reducing the frequency of manual cleaning.

[0019] 4. The cylinder drives the ejector rod and the retaining ring to jointly control the displacement of the connecting plate. Combining with the elastic reset mechanisms of the first spring and the third spring, it realizes the rapid switching between the pulp extrusion and cleaning modes. The inclined plane and notch design of the spiral blade automatically trigger the movement of the push rod, without the need for additional sensors or power sources, with a simple and reliable structure and reduced failure risk.

[0020] 5. The first to fourth one-way valves respectively control the flow directions of liquids and gases, avoiding reverse flow interference, ensuring the stability of the system pressure and optimizing the energy consumption. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the pulp extruder.

[0022] Figure 2 It is a diagram showing the positional relationship between the ejector rod and the fixed block.

[0023] Figure 3 It is a schematic diagram showing the connection between the ejector rod and the retaining ring.

[0024] Figure 4 It is a cross-sectional view of this pulp extruder.

[0025] Figure 5 It is a schematic diagram of the spiral blade on the conical cylinder.

[0026] Figure 6 It is a schematic diagram of the spray hole.

[0027] Figure 7 It is a schematic diagram of the inclined plane at the left end of the spiral blade.

[0028] Figure 8 It is a schematic diagram showing the connection between the push rod and the second piston plate.

[0029] Figure 9 It is a schematic diagram of the cross-sectional structure of the air pipe.

[0030] The names of the components in the drawings are: 1. Frame body; 2. Fixed cylinder; 3. Feed inlet; 4. Filter cylinder; 5. Box body; 6. Conical cylinder; 7. Spiral blade; 8. Inclined plane; 9. Notch; 10. Rotating shaft; 11. Liquid cavity; 12. First piston plate; 13. First spring; 14. Slide bar; 15. Connecting plate; 16. Fixed rod; 17. Motor; 18. Connecting pipe; 19. First one-way valve; 20. Through hole; 21. Spray hole; 22. Second one-way valve; 23. Gas cavity; 24. Second piston plate; 25. Second spring; 26. Slide groove; 27. Push rod; 28. Third one-way valve; 29. Delivery pipe; 30. Fourth one-way valve; 31. Air pipe; 32. Air hole; 33. Fixed plate; 34. Rectangular rod; 35. Third spring; 36. Extrusion plate; 37. Fixed block; 38. Retaining ring; 39. Inner rod; 40. Ejector rod; 41. Cylinder; 42. Liquid discharge hole; 43. Spacer ring; 44. Inner pipe. Detailed Implementation Modes

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0032] A pulp squeezing process for papermaking includes the following steps: (1) Clean and disinfect various sheet materials containing wood fibers, and then soak them in ozone water.

[0033] (2) Grind the soaked sheet materials into coarse pulp using a refiner. After washing the coarse pulp with water, put it into a biological catalytic pool. The water for washing the coarse pulp is returned to the biological catalytic pool. Add a biological catalyst to the biological catalytic pool, and the coarse pulp undergoes biological catalysis and degradation in the biological catalytic pool.

[0034] (3) Fine-grind the catalytically degraded coarse pulp into fine pulp and then bleach it. After concentrating the bleached fine pulp, use a squeezing machine to squeeze the pulp.

[0035] In step 2, the water after washing the coarse pulp is returned to the biological catalytic pool. Using the water after washing the coarse pulp in combination with the biological catalyst to conduct biological catalysis and degradation on the coarse pulp can reduce water consumption and production costs.

[0036] As Figures 1-9 shown, the squeezing machine includes a box body 5, and a liquid discharge hole 42 is opened at the lower end of the box body 5.

[0037] A filter cylinder 4 is fixed inside the box body 5. A fixed cylinder 2 is fixed at the left end of the filter cylinder 4. A feed port 3 is arranged on the fixed cylinder 2. The bleached fine pulp enters the fixed cylinder 2 through the feed port 3.

[0038] A cone cylinder 6 is rotatably arranged concentrically inside the filter cylinder 4. The diameter of the left end of the cone cylinder 6 is smaller than that of the right end. The left end of the cone cylinder 6 extends into the fixed cylinder 2. A spiral blade 7 is fixed on the outer side of the cone cylinder 6.

[0039] An extrusion plate 36 is elastically slidably arranged on the right side of the box body 5, and the extrusion plate 36 seals and plugs the sealed end of the filter cylinder 4 on one side thereof.

[0040] A partition ring 43 is fixed inside the left side of the fixed cylinder 2. An inner pipe 44 is concentrically and fixedly connected to the left end of the cone cylinder 6. The inner pipe 44 penetrates through the partition ring 43, and the inner pipe 44 is movably and sealingly connected to the partition ring 43.

[0041] A liquid cavity 11 is formed inside a part of the fixed cylinder 2 on the left side of the spacer ring 43. A rotating shaft 10 is arranged inside the liquid cavity 11. The left end of the rotating shaft 10 extends to the outside of the fixed cylinder 2. The rotating shaft 10 is movably and sealingly connected to the left end of the fixed cylinder 2. The right end of the rotating shaft 10 is concentrically and fixedly connected to the inner tube 44. A connecting plate 15 is slidably arranged on the left side of the fixed cylinder 2. The rotating shaft 10 penetrates through the connecting plate 15, and the rotating shaft 10 is rotatably connected to the connecting plate 15. A plurality of fixing rods 16 are fixed on the housing of the motor 17. The fixing rods 16 are fixedly connected to the connecting plate 15. The output shaft of the motor 17 is concentrically and fixedly connected to the rotating shaft 10.

[0042] The right end of the rotating shaft 10 is rotatably and sealingly connected to a first piston plate 12. The outer edge of the first piston plate 12 is slidably and sealingly connected to the wall of the liquid cavity 11. The first piston plate 12 is elastically connected to the left end of the fixed cylinder 2 through a first spring 13. The liquid cavity 11 is communicated with a connecting pipe 18. A first one-way valve 19 is installed inside the connecting pipe 18. A plurality of sliding rods 14 are fixed on the connecting plate 15. The sliding rods 14 penetrate through the left end of the fixed cylinder 2 and are fixedly connected to the first piston plate 12. The sliding rods 14 are slidably and sealingly connected to the left end of the fixed cylinder 2.

[0043] A plurality of through holes 20 are formed in the inner tube 44 on the left side of the spacer ring 43. The through holes 20 communicate the inner tube 44 and the liquid cavity 11. A plurality of spray holes 21 are formed on both the conical cylinders 6 on both sides of the spiral blade 7. The outlet ends of the spray holes 21 face the spiral blade 7. A second one-way valve 22 is installed inside the spray holes 21.

[0044] Thrust rods 40 are slidably arranged in the horizontal direction on the front and rear sides of the box body 5. Cylinders 41 are fixed on the front and rear sides at the left end of the box body 5. The telescopic rods of the cylinders 41 are fixedly connected to the thrust rods 40. A retaining ring 38 is arranged between the connecting plate 15 and the fixed cylinder 2. The thrust rod 40 is fixedly connected to the retaining ring 38. The left end of the retaining ring 38 abuts tightly against the right end of the connecting plate 15.

[0045] Fixing blocks 37 are fixed at both the front and rear ends of the pressing plate 36. The two fixing blocks 37 correspond to the two thrust rods 40 respectively. The fixing blocks 37 are located on the right side of the thrust rods 40. A rectangular rod 34 is fixed at the right end of the pressing plate 36. A fixing plate 33 is slidably arranged on the rectangular rod 34. The fixing plate 33 is fixedly connected to the box body 5. The fixing plate 33 is connected to the pressing plate 36 through a third spring 35.

[0046] In this embodiment, both the box body 5 and the fixing plate 33 are fixed on the frame body 1.

[0047] A sliding groove 26 is formed in the wall of the fixed cylinder 2. The sliding groove 26 communicates with the inside of the fixed cylinder 2.

[0048] A gas cavity 23 is formed inside the wall of the fixed cylinder 2 on the right side of the sliding groove 26. The right end of the gas cavity 23 communicates with the outside of the fixed cylinder 2.

[0049] A push rod 27 in the shape of an L is slidably arranged in the sliding groove 26. The upper end of the vertical part of the push rod 27 is located inside the fixed cylinder 2. The straight part of the push rod 27 penetrates through the part of the fixed cylinder 2 between the sliding groove 26 and the gas chamber 23. The straight part of the push rod 27 is slidably and sealingly connected to the part of the fixed cylinder 2 between the sliding groove 26 and the gas chamber 23. A second piston plate 24 is slidably and sealingly arranged in the gas chamber 23. The straight part of the push rod 27 is fixedly connected to the second piston plate 24.

[0050] A third one-way valve 28 is installed on the second piston plate 24. The right end of the second piston plate 24 is connected to the fixed cylinder 2 through a second spring 25.

[0051] A trachea 31 is fixed to the right end of the box body 5. The trachea 31 is located above the right end of the filter cartridge 4. A plurality of air holes 32 are opened at the lower end of the trachea 31. The gas chamber 23 on the left side of the second piston plate 24 is communicated with the trachea 31 through a delivery pipe 29. A fourth one-way valve 30 is installed on the delivery pipe 29.

[0052] An inclined surface 8 is opened at the left end of the spiral blade 7. A notch 9 is opened at the outer edge on the left side of the spiral blade 7. During the rotation of the spiral blade 7, under the guiding action of the inclined surface 8, the vertical part of the push rod 27 can enter between the spiral blades 7. During the subsequent rotation of the spiral blade 7, the push rod 27 can drive the second piston plate 24 to move in the right direction. The second piston plate 24 moves to the right and compresses the second spring 25. When the push rod 27 corresponds to the notch 9, the push rod 27 and the second piston plate 24 are reset under the elastic force of the second spring 25.

[0053] As Figures 1-4 shown, all the states shown in the figure are the initial states of the pulp squeezing machine. At this time, the air cylinder 41 is in the extended state. The retaining ring 38 tightly abuts against the right end face of the connecting plate 15. The connecting plate 15 is restricted between the frame body 1 and the retaining ring 38. The connecting plate 15, the sliding rod 14, the first piston plate 12, the rotating shaft 10, the motor 17, the inner pipe 44, the conical cylinder 6 and the spiral blade 7 cannot move left and right. At this time, the first spring 13 is in the compressed state; both the liquid chamber 11 and the inside of the conical cylinder 6 are filled with liquid; the communicating pipe 18 is connected to the external water storage tank. The first one-way valve 19 can only make the liquid in the communicating pipe 18 enter the liquid chamber 11; the second one-way valve 22 can only make the liquid in the conical cylinder 6 spray out from the spray holes 21.

[0054] The second piston plate 24 is located inside the left end of the gas chamber 23 under the elastic action of the second spring 25. The vertical part of the push rod 27 is located inside the left end of the sliding groove 26. The third one-way valve 28 can only make the outside air of the fixed cylinder 2 enter the gas chamber 23 on the left side of the second piston plate 24. The fourth one-way valve 30 can only make the air in the gas chamber 23 on the left side of the second piston plate 24 enter the delivery pipe 29. The pressing plate 36 tightly abuts against the right end of the filter cartridge 4 under the elastic action of the third spring 35.

[0055] During operation, the motor 17 is started. The motor 17 drives the rotating shaft 10, the inner tube 44, the conical cylinder 6, and the spiral blade 7 to rotate. Fine pulp is injected into the fixed cylinder 2 from the feed port 3. Through the rotation of the spiral blade 7, the fine pulp is driven to move to the right. Since the diameter of the left end of the conical cylinder 6 is smaller than that of the right end, the distance between the conical cylinder 6 and the filter cylinder 4 gradually becomes smaller. During the process of the fine pulp being conveyed to the right by the spiral blade 7, it is continuously squeezed. The slurry in the fine pulp enters the box body 5 through the filter holes of the filter cylinder 4 and is discharged through the drain hole 42.

[0056] After the slurry of the fine pulp is extruded, solid by-products are generated. With the rotation of the spiral blade 7, the solid by-products push the extrusion plate 36 to move to the right and compress the third spring 35. The solid by-products can be discharged from the right end of the filter cylinder 4.

[0057] During the rotation of the spiral blade 7, under the guiding action of the inclined surface 8, the vertical part of the push rod 27 can enter between the spiral blades 7. Through the rotation of the spiral blade 7, the push rod 27 can be pushed to move to the right in the sliding groove 26. The push rod 27 pushes the second piston plate 24 to move to the right in the gas chamber 23, and the second spring 25 is compressed. During the process of the second piston plate 24 moving to the right, by setting the third one-way valve 28, the air outside the fixed cylinder 2 can pass through the third one-way valve 28 and enter the part of the gas chamber 23 on the left side of the second piston plate 24. After the vertical part of the push rod 27 corresponds to the notch 9, the spiral blade 7 loses the blocking effect on the vertical part of the push rod 27. Under the elastic action of the second spring 25, the second piston plate 24 and the push rod 27 quickly move to the left to reset. During the reset process of the second piston plate 24 and the push rod 27, the gas in the gas chamber 23 will enter the trachea 31 through the fourth one-way valve 30 and the delivery pipe 29 and be ejected from the plurality of air holes 32. The gas ejected from the air holes 32 can impact the solid by-products discharged from the right end of the filter cylinder 4, thereby preventing the solid by-products from blocking the right end of the filter cylinder 4. After the second piston plate 24 and the push rod 27 move to the left and reset, during the subsequent rotation of the spiral blade 7, the push rod 27 and the second piston plate 24 can continue to move to the right. That is, during the rotation of the spiral blade 7, the push rod 27 and the second piston plate 24 will continuously move left and right reciprocally, and compressed air will be intermittently ejected from the air holes 32.

[0058] An inner rod 39 is slidably arranged on the barrel wall of the fixed cylinder 2 on the left side of the sliding groove 26. The left end of the inner rod 39 abuts against the right end of the tight resistance ring 38, and the right end of the inner rod 39 abuts against the vertical part of the push rod 27.

[0059] After the squeezing process is completed and the squeezing machine needs to be cleaned, the air cylinder 41 is shortened. The air cylinder 41 drives the ejector rod 40 and the retaining ring 38 to move towards the right. After the retaining ring 38 moves to the right, the connecting plate 15 is no longer limited by the retaining ring 38. Under the elastic action of the first spring 13, the first piston plate 12, the sliding rod 14, the connecting plate 15, the motor 17, the rotating shaft 10, the inner tube 44, the conical cylinder 6, the spiral blade 7 and the fixing rod 16 move to the right, and the first piston plate 12 stops moving after tightly abutting against the separating ring 43. After the ejector rod 40 moves to the right, it will push the fixing block 37 and the extrusion plate 36 to move to the right, and the third spring 35 is compressed. After the extrusion plate 36 moves towards the right, the right end of the filter cylinder 4 is opened, so that it is convenient for the liquid and residues for flushing the spiral blade 7 to be discharged from the right end of the filter cylinder 4.

[0060] When the connecting plate 15 moves to the right, the inner rod 39 moves to the right accordingly and will push the push rod 27 and the second piston plate 24 to move towards the right. After the first piston plate 12 tightly abuts against the separating ring 43, the inner rod 39 and the right groove wall of the chute 26 limit the vertical part of the push rod 27.

[0061] Then the motor 17 is started. The motor 17 drives the rotating shaft 10, the inner tube 44, the conical cylinder 6 and the spiral blade 7 to rotate. During the rotation of the spiral blade 7, since the push rod 27 is limited, under the guiding action of the inclined surface 8, the spiral blade 7, the inner tube 44, the first piston plate 12, the rotating shaft 10, the sliding rod 14, the motor 17, the fixing rod 16 and the connecting plate 15 will move towards the left at the same time, and the first spring 13 is compressed. During the process of the first piston plate 12 moving to the left, the water in the connecting pipe 18 can be pumped into the liquid cavity 11 through the setting of the first one-way valve 19.

[0062] When the notch 9 corresponds to the vertical part of the push rod 27, the vertical part of the push rod 27 is no longer blocked by the spiral blade 7. Under the elastic action of the first spring 13, the first piston plate 12, the rotating shaft 10, the inner tube 44, the sliding rod 14, the connecting plate 15, the motor 17, the fixing rod 16, the conical cylinder 6 and the spiral blade 7 move to the right. When the first piston plate 12 moves towards the right, the water in the liquid cavity 11 on the right side of the first piston plate 12 enters the conical cylinder 6 through the through hole 20 and sprays out from the plurality of spray holes 21. The liquid sprayed out from the spray holes 21 flushes the surface of the spiral blade 7.

[0063] Meanwhile, during the process of the conical cylinder 6 and the spiral blade 7 moving rightward under the elastic action of the first spring 13, the right end of the conical cylinder 6 can hit the extrusion plate 36. Through the vibration generated by the impact, the solid by-products on the conical cylinder 6, the spiral blade 7 and the extrusion plate 36 can fall off, thereby enhancing the cleaning effect. During the rotation of the spiral blade 7, the first piston plate 12, the rotating shaft 10, the inner tube 44, the sliding rod 14, the connecting plate 15, the motor 17, the fixed rod 16, the conical cylinder 6 and the spiral blade 7 will move left and right reciprocally. The spray holes 21 will intermittently spray liquid to wash the surface of the spiral blade 7, and the conical cylinder 6 and the spiral blade 7 will intermittently hit the extrusion plate 36, thereby improving the cleaning effect.

[0064] After the cleaning is completed, the air cylinder 41 is extended to reset, and the pulp extruder returns to the initial state.

[0065] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pulp squeezing process for papermaking, comprising the following steps: (1) Cleaning and disinfecting various sheet materials containing wood fibers, and then soaking them in ozone water; (2) Grinding the soaked sheet materials into coarse pulp by a refiner. After washing the coarse pulp with water, putting it into an aquatic biological catalytic pool, the water for washing the coarse pulp is recycled to the biological catalytic pool, adding a biological catalyst to the biological catalytic pool, and carrying out biological catalysis and degradation of the coarse pulp in the biological catalytic pool; (3) Finely grinding the catalytically degraded coarse pulp into fine pulp and then bleaching it. After concentrating the bleached fine pulp, squeezing it with a squeezing machine; The squeezing machine comprises a box body (5). A liquid discharge hole (42) is formed at the lower end of the box body (5). A filter cylinder (4) is fixed in the box body (5). A fixed cylinder (2) is fixed at the left end of the filter cylinder (4). A feed inlet (3) is arranged on the fixed cylinder (2). The bleached fine pulp enters the fixed cylinder (2) through the feed inlet (3). A tapered cylinder (6) is rotatably arranged concentrically in the filter cylinder (4). The diameter of the left end of the tapered cylinder (6) is smaller than that of the right end. The left end of the tapered cylinder (6) extends into the fixed cylinder (2). A spiral blade (7) is fixed on the outer side of the tapered cylinder (6). An extrusion plate (36) is elastically slidably arranged on the right side of the box body (5). The extrusion plate (36) seals and plugs the sealing end of the filter cylinder (4) on one side thereof. A partition ring (43) is fixed inside the left side of the fixed cylinder (2). An inner pipe (44) is concentrically fixedly communicated with the left end of the tapered cylinder (6). The inner pipe (44) penetrates through the partition ring (43), and the inner pipe (44) is movably and sealingly connected with the partition ring (43). A liquid cavity (11) is formed inside a part of the fixed cylinder (2) on the left side of the partition ring (43). A rotating shaft (10) is arranged inside the liquid cavity (11). The left end of the rotating shaft (10) extends to the outside of the fixed cylinder (2). The rotating shaft (10) is movably and sealingly connected with the left end of the fixed cylinder (2). The right end of the rotating shaft (10) is concentrically fixedly connected with the inner pipe (44). A connecting plate (15) is slidably arranged on the left side of the fixed cylinder (2). The rotating shaft (10) penetrates through the connecting plate (15), and the rotating shaft (10) is rotatably connected with the connecting plate (15). A motor (17) is fixed on the connecting plate (15). The output shaft of the motor (17) is concentrically fixedly connected with the rotating shaft (10).

2. The pulp squeezing process for papermaking pulp according to claim 1, characterized in that, The right end of the rotating shaft (10) is rotatably and sealingly connected to a first piston plate (12). The outer edge of the first piston plate (12) is slidably and sealingly connected to the chamber wall of the liquid chamber (11). The first piston plate (12) and the left end of the fixed cylinder (2) are elastically connected by a first spring (13). The liquid chamber (11) is communicated with a connecting pipe (18). A first one-way valve (19) is installed in the connecting pipe (18). A plurality of sliding rods (14) are fixed on the connecting plate (15). After passing through the left end of the fixed cylinder (2), the sliding rods (14) are fixedly connected to the first piston plate (12). The sliding rods (14) are slidably and sealingly connected to the left end of the fixed cylinder (2). A plurality of through holes (20) are formed in the inner pipe (44) on the left side of the spacer ring (43). The through holes (20) communicate the inner pipe (44) and the liquid chamber (11). A plurality of spray holes (21) are formed in the conical cylinders (6) on both sides of the spiral blade (7). The outlet ends of the spray holes (21) face the spiral blade (7). A second one-way valve (22) is installed in the spray holes (21). Thrust rods (40) are slidably arranged in the horizontal direction on both the front and rear sides of the box body (5). On both the front and rear sides of the left end of the box body (5), air cylinders (41) are fixed. The telescopic rods of the air cylinders (41) are fixedly connected to the thrust rods (40). A retaining ring (38) is arranged between the connecting plate (15) and the fixed cylinder (2). The thrust rod (40) is fixedly connected to the retaining ring (38). The left end of the retaining ring (38) abuts tightly against the right end of the connecting plate (15).

3. The pulp squeezing process for papermaking pulp according to claim 2, characterized in that, Fixed blocks (37) are fixed at both the front and rear ends of the pressing plate (36). The two fixed blocks (37) correspond to the two thrust rods (40) respectively. The fixed blocks (37) are located on the right side of the thrust rods (40). A rectangular rod (34) is fixed to the right end of the pressing plate (36). A fixing plate (33) is slidably arranged on the rectangular rod (34). The fixing plate (33) is fixedly connected to the box body (5). The fixing plate (33) and the pressing plate (36) are connected by a third spring (35).

4. The squeezing process of papermaking pulp according to claim 3, characterized in that, Both the box body (5) and the fixing plate (33) are fixed on the frame body (1).

5. The pulp squeezing process for papermaking pulp according to claim 1, characterized in that, A plurality of fixing rods (16) are fixed on the housing of the motor (17). The fixing rods (16) are fixedly connected to the connecting plate (15).

6. The pulp squeezing process for papermaking pulp according to claim 3, characterized in that, A chute (26) is formed in the cylinder wall of the fixed cylinder (2). The chute (26) communicates with the inside of the fixed cylinder (2). A gas chamber (23) is formed in the cylinder wall of the fixed cylinder (2) on the right side of the chute (26). The right end of the gas chamber (23) communicates with the outside of the fixed cylinder (2). An L-shaped push rod (27) is slidably arranged in the chute (26). The upper end of the vertical portion of the push rod (27) is located inside the fixed cylinder (2). The straight portion of the push rod (27) penetrates through the part of the fixed cylinder (2) between the chute (26) and the gas chamber (23). The straight portion of the push rod (27) is slidably and sealingly connected to the part of the fixed cylinder (2) between the chute (26) and the gas chamber (23). A second piston plate (24) is slidably and sealingly arranged in the gas chamber (23). The straight portion of the push rod (27) is fixedly connected to the second piston plate (24). A third one-way valve (28) is installed on the second piston plate (24). The right end of the second piston plate (24) is connected to the fixed cylinder (2) by a second spring (25). A trachea (31) is fixed to the right end of the box body (5). The trachea (31) is located above the right end of the filter cartridge (4). A plurality of air holes (32) are formed at the lower end of the trachea (31). The gas chamber (23) on the left side of the second piston plate (24) communicates with the trachea (31) through a delivery pipe (29). A fourth one-way valve (30) is installed on the delivery pipe (29). An inclined surface (8) is formed at the left end of the spiral blade (7). A notch (9) is formed at the left outer edge of the spiral blade (7). During the rotation of the spiral blade (7), under the guiding action of the inclined surface (8), the vertical portion of the push rod (27) can enter between the spiral blades (7). During the subsequent rotation of the spiral blade (7), the push rod (27) can drive the second piston plate (24) to move in the right direction. The second piston plate (24) moves to the right and compresses the second spring (25). When the push rod (27) corresponds to the notch (9), under the elastic force of the second spring (25), the push rod (27) and the second piston plate (24) reset.

7. The pulp squeezing process for papermaking pulp according to claim 6, wherein, An inner rod (39) is slidably arranged on the cylinder wall of the fixed cylinder (2) on the left side of the chute (26). The left end of the inner rod (39) abuts against the right end of the tight resisting ring (38). The right end of the inner rod (39) tightly abuts against the vertical portion of the push rod (27).

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