Production process and device of half-needle poplar mixed pulp

Abstract

The invention discloses a production process and device of half-needle poplar mixed pulp, and relates to the technical field of mixed paper pulp production. The method comprises the following steps: S1, mixing the semi-needle wood chips and the poplar wood chips in proportion; s2, the mixed wood chips are screened, and then silt and dust attached to the surfaces of the wood chips are washed away; a production device used in the production process of the half-needle poplar mixed pulp comprises a base, a discharging turnover device is arranged in the middle of the top end of the base, a waste discharging device is arranged at the top of the discharging turnover device, an outer cylinder is arranged at the top end of the waste discharging device, and a rotary driving assembly and a synchronous turnover stirring assembly are arranged in the outer cylinder; by arranging the rotary driving assembly and the synchronous overturning and stirring assembly, forward rotation of the screening roller is matched with reverse rotation of the rotating frame, meanwhile, the rotating pipe is driven to rotate while revolving along with the rotating frame, and materials in the screening roller are overturned and stirred in combination with an annular partition plate on the outer wall of a guide-out pipe.

Description

Technical Field

[0001] This invention relates to the field of mixed pulp production technology, specifically to a production process and apparatus for semi-needle poplar mixed pulp. Background Technology

[0002] Semi-needle poplar mixed pulp is a pulp product made from semi-needle poplar wood chips and poplar wood chips as the core raw materials. After being mixed in a specific ratio, the pulp undergoes pretreatment, pre-impregnation, refining, bleaching, and washing processes. In its production process, the two types of wood chips must first be mixed in a certain ratio before pretreatment. However, in the screening stage of the pretreatment wood chips, the wood chips tend to accumulate in the screening frame. Relying solely on a single vibrating screening method, it is difficult to effectively separate some of the impurities encased inside the wood chips, resulting in a large amount of impurities remaining in the pretreated wood chips. This not only increases the consumption of chemicals in subsequent pulping processes but also directly affects the purity of the pulp fibers. Furthermore, screening, washing, and steam treatment are usually completed by independent devices. This decentralized processing mode not only extends the production line layout but also requires frequent transfer of wood chips, leading to a significant reduction in production efficiency in the pretreatment stage. To address these issues, the inventors have proposed a production process and apparatus for semi-needle poplar mixed pulp to solve these problems. Summary of the Invention

[0003] To address the issues of uniformity in wood chip processing and the switching between multiple processing steps, the present invention aims to provide a production process and apparatus for semi-needle poplar mixed pulp.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a production process for semi-needle poplar mixed pulp, comprising the following steps: S1. Based on the preset performance indicators of the finished pulp, precisely control the mixing ratio of semi-coniferous wood chips and poplar wood chips, and send the mixture to the raw material temporary storage warehouse for later use. S2. First, the mixed wood chips are sieved to remove impurities such as excessively fine wood powder and bark fragments. Then, the mud and dust adhering to the surface of the wood chips are rinsed to reduce the ineffective consumption of subsequent chemicals. After purification, the wood chips are sent into the pre-steam chamber and treated with saturated steam at 100-110℃ for 10-20 minutes. The heat softens the lignin in the wood and removes the air between the wood chips. S3. The pretreated mixed wood chips first enter the spiral extrusion preimpregnation machine and complete the first stage of preimpregnation under low temperature and low pressure conditions, so that the alkaline bleaching chemicals can initially penetrate and act on the fibers. After the first stage of preimpregnation, the wood chips are transferred to the high-pressure preimpregnation chamber for the second stage of preimpregnation in a high temperature and high pressure environment, which further removes some lignin and improves the whiteness of the wood chips. S4. The pre-impregnated wood chips are conveyed to a double-disc refiner for a coarse grinding process. The coarse grinding process initially separates the wood chips into fiber bundles and some individual fibers. After the coarse grinding is completed, the gap between the grinding discs is adjusted to perform a second fine grinding process to refine the fibers. S5. After refining, the pulp is sent to a stirred bleaching tank, where hydrogen peroxide and other bleaching agents are added to remove residual lignin and pigments through oxidation. After bleaching, the pH of the pulp is adjusted to a neutral range of 6.5-7.5 with dilute sulfuric acid to prevent fiber degradation. S6. After bleaching, the pulp is first treated by a pressure screen to separate impurities such as unground wood chips and coarse fiber bundles through the screen. Then the pulp enters a vacuum washing machine to wash away residual chemicals, dissolved lignin and small molecule impurities. S7. The washed pulp is transported to the thickening tank, where clean water is added to adjust the pulp concentration to 8%-10%. The qualified semi-spindle poplar mixed pulp is sent to the finished pulp tower for temporary storage. When production is needed, the pulp is transported to the papermaking workshop through pipelines or tank trucks.

[0005] A production apparatus used in the production process of semi-spindle poplar mixed pulp includes a base, a material feeding and turning device is provided at the middle of the top of the base, a waste discharge device is provided at the top of the material feeding and turning device, an outer cylinder is provided at the top of the waste discharge device, a rotary drive assembly and a synchronous turning and stirring assembly are provided inside the outer cylinder, and a conveying and switching assembly is provided on one side of the top of the base.

[0006] Preferably, the rotary drive assembly includes a screening drum and two symmetrically distributed guide rings. The two guide rings are fixedly installed at both ends of the screening drum by brackets. The two guide rings are rotatably installed on the inner wall of the outer cylinder. A drive shaft is rotatably installed on the inner wall of the outer cylinder through a bearing seat. A drive gear is fixedly installed at the end of the drive shaft. An internal gear ring is fixedly installed on the inner wall of the guide ring on one side of the drive shaft, and the bottom of the drive gear is meshed with the internal gear ring. A servo motor is fixedly installed on the inner wall of the outer cylinder, and the drive end of the servo motor is connected to the drive shaft through a coupling. An external gear ring is fixedly sleeved on the inner outer wall of the rotating frame, and the external gear ring is meshed with the top of the drive gear.

[0007] Preferably, the synchronous flipping stirring assembly includes an input cylinder, which is rotatably installed in the middle of one side of the outer cylinder. A No. 1 five-way pipe is fixedly installed at the end of the input cylinder. The four discharge ends of the No. 1 five-way pipe are connected to a guide pipe. A rotating pipe is rotatably sealed to the inner wall of the other end of the guide pipe. A driven gear is fixedly sleeved on the outer wall of the rotating pipe. A fixed gear ring that cooperates with the driven gear is fixedly installed on the inner wall of the outer cylinder through a bracket. The driven gear is meshed with the inner side of the fixed gear ring. Two symmetrically distributed pulley frames are fixedly installed on the inner wall of the outer cylinder. A rotating frame is rotatably installed on the pulley frames. The guide pipe passes through the inner side of the rotating frame. The rotating pipe is rotatably installed on the rotating frame. A No. 2 five-way pipe is fixedly installed at the end of the rotating frame. Each of the four discharge ends of the No. 2 five-way pipe is connected to an outlet pipe. Three partitions arranged in a ring array are securely installed on the outer wall of the outlet pipe by bolts. An inlet frame is rotatably sealed to the outer wall of one end of the input cylinder. The inlet frame is securely installed on the outer wall of the outer cylinder by bolts.

[0008] Preferably, the conveying switching assembly includes a diversion frame, which is fixedly installed on the top of the base. A sliding shaft is slidably inserted into the diversion frame, and pistons No. 1, No. 2, and No. 3 are fixedly sleeved on the outer wall of the sliding shaft, and pistons No. 1, No. 2, and No. 3 are slidably and sealingly connected to the diversion frame. The input end of the diversion frame is respectively connected to a liquid inlet pipe, an air inlet pipe, and a steam pipe. The output end of the diversion frame is connected to a manifold pipe that cooperates with the liquid inlet pipe, the air inlet pipe, and the steam pipe. A heat-resistant rubber hose is connected to the top of the manifold pipe, and the other end of the heat-resistant rubber hose is connected to the liquid inlet end of the inlet frame. A limit frame is fixedly installed on the end of the sliding shaft near the steam pipe. A plug is inserted through the limit frame, and a baffle is fixedly sleeved on the outer wall of the plug, and the baffle slides in the inner wall of the limit frame. A return spring is sleeved on the outer wall of the plug, and both ends of the return spring are fixedly connected to the baffle and the inner wall of the limit frame, respectively. Three limit grooves that cooperate with the plug are opened on the base.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention sets up a rotary drive component and a synchronous flipping and stirring component, so that the forward rotation of the screening drum and the reverse rotation of the rotating frame cooperate with each other. At the same time, the rotating tube is driven to rotate on its own axis while revolving with the rotating frame. Combined with the annular baffle on the outer wall of the outlet tube, the material inside the screening drum is turned over and stirred, which effectively avoids the accumulation of wood chips and allows the wood chips to be affected in all directions and evenly during screening, contact with cleaning liquid or steam, etc. 2. This invention, by setting up a conveying switching component, can easily switch between different processes such as cleaning, steam softening, and water filtration by adjusting the bolt and changing the positions of the sliding shaft, piston No. 1, piston No. 2, and piston No. 3. No additional complex pipeline modifications are required, saving process switching time, improving production efficiency, and adapting to the needs of different process stages for wood chip processing. 3. By setting up an inlet frame and a guide pipe, the input cylinder and the rotating pipe are respectively rotated and sealed in the inlet frame and the guide pipe, ensuring that the input cylinder and the rotating pipe maintain a stable connection and a continuous passage during their respective rotation, effectively avoiding the problem of medium leakage or passage interruption caused by component rotation. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overall front structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the back side of the present invention; Figure 3 This is a schematic diagram of the side-section structure in this invention; Figure 4 This is a schematic diagram of the structure of the screening roller and guide ring in this invention; Figure 5 This is a schematic diagram of the structure of the fixed toothed ring and pulley frame in this invention; Figure 6 This is a schematic diagram of the side profile of the outer cylinder in this invention; Figure 7 This is a schematic diagram of the side profile of the rotating frame in this invention; Figure 8 This is a partial structural diagram of the synchronous flipping and stirring assembly in this invention; Figure 9 This is a schematic diagram of the exploded structure of the outlet tube and partition in this invention; Figure 10 This is a schematic diagram of the drive gear and the transmission structure of the external gear ring and the internal gear ring in this invention; Figure 11 This is a schematic diagram of the cross-sectional structure of the conveying switching component in this invention; Figure 12 This is a schematic diagram of the three-position switching structure of the conveyor switching group in this invention; Figure 13 for Figure 7 Enlarged structural diagram at point A; Figure 14 for Figure 7 Enlarged structural diagram at point B; Figure 15 for Figure 11 A magnified schematic diagram of the structure at point C.

[0012] In the diagram: 1. Base; 2. Feeding and tilting device; 3. Waste discharge device; 4. Outer cylinder; 5. Rotary drive assembly; 501. Screening drum; 502. Guide ring; 503. Internal gear ring; 504. Drive shaft; 505. Drive gear; 506. Servo motor; 6. Synchronous tilting and stirring assembly; 601. Input cylinder; 602. No. 1 five-way pipe; 603. Guide pipe; 604. Rotating pipe; 605. Driven gear; 606. Fixed gear ring; 607. No. 2 five-way pipe; 608. Outlet pipe; 6 09. Partition; 610. Rotating frame; 611. Pulley frame; 612. External gear ring; 613. Inlet frame; 7. Conveying switching assembly; 701. Diverting frame; 702. Sliding shaft; 703. Piston No. 1; 704. Piston No. 2; 705. Piston No. 3; 706. Liquid inlet pipe; 707. Air inlet pipe; 708. Steam pipe; 709. Manifold; 710. Limiting frame; 711. Plug; 712. Baffle; 713. Return spring; 714. Limiting groove; 715. Heat-resistant rubber hose. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Example: Figure 1-15 As shown, the present invention provides a technical solution: a production process for a semi-needle poplar mixed pulp, comprising the following steps: S1. Based on the preset performance indicators of the finished pulp, precisely control the mixing ratio of semi-coniferous wood chips and poplar wood chips, and send the mixture to the raw material temporary storage warehouse for later use. S2. First, the mixed wood chips are sieved to remove impurities such as excessively fine wood powder and bark fragments. Then, the mud and dust adhering to the surface of the wood chips are rinsed to reduce the ineffective consumption of subsequent chemicals. After purification, the wood chips are sent into the pre-steam chamber and treated with saturated steam at 100-110℃ for 10-20 minutes. The heat softens the lignin in the wood and removes the air between the wood chips. S3. The pretreated mixed wood chips first enter the spiral extrusion preimpregnation machine and complete the first stage of preimpregnation under low temperature and low pressure conditions, so that the alkaline bleaching chemicals can initially penetrate and act on the fibers. After the first stage of preimpregnation, the wood chips are transferred to the high-pressure preimpregnation chamber for the second stage of preimpregnation in a high temperature and high pressure environment, which further removes some lignin and improves the whiteness of the wood chips. S4. The pre-impregnated wood chips are conveyed to a double-disc refiner for a coarse grinding process. The coarse grinding process initially separates the wood chips into fiber bundles and some individual fibers. After the coarse grinding is completed, the gap between the grinding discs is adjusted to perform a second fine grinding process to refine the fibers. S5. After refining, the pulp is sent to a stirred bleaching tank, where hydrogen peroxide and other bleaching agents are added to remove residual lignin and pigments through oxidation. After bleaching, the pH of the pulp is adjusted to a neutral range of 6.5-7.5 with dilute sulfuric acid to prevent fiber degradation. S6. After bleaching, the pulp is first treated by a pressure screen to separate impurities such as unground wood chips and coarse fiber bundles through the screen. Then the pulp enters a vacuum washing machine to wash away residual chemicals, dissolved lignin and small molecule impurities. S7. The washed pulp is transported to the thickening tank, where clean water is added to adjust the pulp concentration to 8%-10%. The qualified semi-spindle poplar mixed pulp is sent to the finished pulp tower for temporary storage. When production is needed, the pulp is transported to the papermaking workshop through pipelines or tank trucks.

[0015] A production device used in the production process of semi-spindle poplar mixed pulp includes a base 1, a feeding and turning device 2 is provided at the middle of the top of the base 1, a waste discharge device 3 is provided at the top of the feeding and turning device 2, an outer cylinder 4 is provided at the top of the waste discharge device 3, a rotary drive component 5 and a synchronous turning and stirring component 6 are provided inside the outer cylinder 4, and a conveying and switching component 7 is provided on one side of the top of the base 1. The rotary drive assembly 5 includes a screening drum 501 and two symmetrically distributed guide rings 502. The two guide rings 502 are fixedly installed at both ends of the screening drum 501 by brackets, and the two guide rings 502 are rotatably installed on the inner wall of the outer cylinder 4. The synchronous tilting and stirring assembly 6 includes an input cylinder 601, which is rotatably installed in the middle of one side of the outer cylinder 4. A No. 1 five-way pipe 602 is fixedly installed at the end of the input cylinder 601. The four discharge ends of the No. 1 five-way pipe 602 are connected to a guide pipe 603. The inner wall of the other end of the guide pipe 603 is rotatably sealed to a rotating pipe 604. A driven gear 605 is fixedly sleeved on the outer wall of the rotating pipe 604. A fixed toothed ring 606 that cooperates with the driven gear 605 is fixedly installed on the inner wall of the outer cylinder 4 through a bracket. The driven gear 605 is meshed with the inner side of the fixed toothed ring 606. The conveying switching assembly 7 includes a diversion frame 701, which is fixedly installed on the top of the base 1. A sliding shaft 702 is slidably inserted into the diversion frame 701. A first piston 703, a second piston 704, and a third piston 705 are respectively fixedly sleeved on the outer wall of the sliding shaft 702, and the first piston 703, the second piston 704, and the third piston 705 are all slidably and sealingly connected to the diversion frame 701.

[0016] By adopting the above technical solution, during the rotation of the screening drum 501, the wood chips in the screening drum 501 are stirred by the synchronous flipping stirring component 6, and the working mode is adjusted by changing the line connection direction by the conveying switching component 7.

[0017] A drive shaft 504 is rotatably mounted on the inner wall of the outer cylinder 4 via a bearing seat. A drive gear 505 is fixedly mounted on the end of the drive shaft 504. An internal gear ring 503 is fixedly mounted on the inner wall of the guide ring 502 located on one side of the drive shaft 504, and the bottom of the drive gear 505 is meshed with the internal gear ring 503. A servo motor 506 is fixedly mounted on the inner wall of the outer cylinder 4, and the drive end of the servo motor 506 is connected to the drive shaft 504 via a coupling.

[0018] By adopting the above technical solution, the servo motor 506 drives the drive shaft 504 to rotate.

[0019] Two symmetrically distributed pulley frames 611 are fixedly installed on the inner wall of the outer cylinder 4. A rotating frame 610 is rotatably installed on the pulley frame 611. The guide pipe 603 passes through the inner side of the rotating frame 610, and the rotating pipe 604 is rotatably installed on the rotating frame 610.

[0020] By adopting the above technical solution, the circular rail on the outer wall of the rotating frame 610 is embedded in the pulley group in the pulley frame 611, providing a stable guarantee for the rotation of the rotating frame 610.

[0021] The rotating frame 610 is fixedly installed with a No. 2 five-way pipe 607. The four discharge ends of the No. 2 five-way pipe 607 are all connected to the outlet pipe 608. The outer wall of the outlet pipe 608 is securely installed with three partitions 609 arranged in a ring array by bolts.

[0022] By adopting the above technical solution, the wood chips are flipped over by the partition 609.

[0023] An inlet frame 613 is provided on the outer wall of one end of the input cylinder 601, and the inlet frame 613 is securely installed on the outer wall of the outer cylinder 4 by bolts.

[0024] By adopting the above technical solution, the inlet frame 613 can continuously convey the material into the inlet cylinder 601 during the rotation of the inlet cylinder 601.

[0025] The input end of the flow divider 701 is connected to the liquid inlet pipe 706, the air inlet pipe 707, and the steam pipe 708, respectively. The output end of the flow divider 701 is connected to the manifold 709, which is used in conjunction with the liquid inlet pipe 706, the air inlet pipe 707, and the steam pipe 708.

[0026] By adopting the above technical solution, the cleaning fluid, high-pressure airflow and steam pipe are sequentially introduced into the diversion frame 701 through the liquid inlet pipe 706, the air inlet pipe 707 and the steam pipe 708.

[0027] The top end of the manifold 709 is connected to a heat-resistant rubber hose 715, and the other end of the heat-resistant rubber hose 715 is connected to the liquid inlet end of the inlet frame 613.

[0028] By adopting the above technical solution, the gas, cleaning fluid and steam in the manifold 709 are transported to the inlet frame 613 through the heat-resistant rubber hose 715.

[0029] A limiting frame 710 is fixedly installed on one end of the sliding shaft 702 near the steam pipe 708. A plug 711 is inserted through the limiting frame 710. A baffle 712 is fixedly sleeved on the outer wall of the plug 711 and slides in the inner wall of the limiting frame 710. A return spring 713 is sleeved on the outer wall of the plug 711 and the two ends of the return spring 713 are fixedly connected to the baffle 712 and the inner wall of the limiting frame 710, respectively. Three limiting grooves 714 are provided on the base 1 at equal intervals to cooperate with the plug 711.

[0030] By adopting the above technical solution, the plug 711 is inserted into the limiting groove 714 to limit the sliding shaft 702.

[0031] An external gear ring 612 is fixedly sleeved on the outer wall of the inner side 610 of the rotating frame, and the external gear ring 612 is meshed with the top of the drive gear 505.

[0032] By adopting the above technical solution, the drive gear 505 rotates synchronously with the rotating frame 610 through the external gear ring 612 during the rotation process.

[0033] Working principle: First, in actual operation, the liquid inlet pipe 706 is connected to the external cleaning liquid input pipe, the air inlet pipe 707 is connected to the external air source, and the steam pipe 708 is connected to the external steam generator. According to the preset performance indicators of the finished pulp, the mixed wood chips are poured into the screening drum 501. Subsequently, as Figure 6 , Figure 10 As shown, the servo motor 506 is activated, and the servo motor 506 drives the drive shaft 504 to rotate via a coupling. The drive shaft 504, through the meshing of the drive gear 505 and the built-in gear ring 503, drives the screening drum 501 to rotate in the forward direction in conjunction with the guide ring 502. At the same time, the drive gear 505, through meshing with the external gear ring 612, drives the rotating frame 610 to rotate synchronously in the reverse direction. Figure 7 , Figure 8As shown, when the rotating frame 610 rotates, it synchronously drives the input cylinder 601, the first five-way pipe 602, and the guide pipe 603 to rotate. At this time, the input cylinder 601 rotates stably within the inlet frame 613. During the rotation of the rotating frame 610, the driven gear 605 drives the rotating pipe 604 to rotate under the action of the fixed gear ring 606. The second five-way pipe 607 at the end of the rotating frame 610 is connected to the outlet pipe 608 through four discharge ends. The three annular array baffles 609 on the outer wall of the outlet pipe 608 rotate synchronously with the outlet pipe 608, forming a tumbling and stirring action on the wood chips inside the screening drum 501, thereby achieving efficient screening. Figure 3 As shown, during the screening process, impurities such as fine wood powder and bark fragments fall through the screen of the screening drum 501 into the discharge frame of the waste discharge device 3, and are then discharged by the conveyor belt inside the device. After screening, the wooden boards are cleaned, such as... Figure 11 As shown, in its initial state, the plug 711 is located in the leftmost limiting groove 714. At this time, the air inlet pipe 707 and the manifold 709 are connected. The second piston 704 and the third piston 705 block the liquid inlet pipe 706 and the steam pipe 708, respectively. Then, the plug 711 is pulled upward to separate the bottom end of the plug 711 from the limiting groove 714. Then, the limiting frame 710 is pulled to move the plug 711 to the middle limiting groove 714. When the plug 711 is released, the return spring 713 pushes the plug 711 into the middle limiting groove 714 through the baffle 712. Figure 12 As shown, Figure 12 The three settings, from left to right, are dewatering, cleaning, and softening. When the plug 711 is in the middle limiting groove 714, the diverter frame 701 is in the cleaning setting. At this time, the inlet pipe 706 and the manifold 709 are connected in one direction. The external cleaning fluid input pipe discharges the cleaning fluid from the inlet pipe 706, diverter frame 701, manifold 709, and heat-resistant rubber hose 715 into the inlet frame 613. The cleaning fluid inside the inlet frame 613 enters the inlet cylinder 601 from the inlet hole at the end of the inlet cylinder 601. The internal passageway leads to the first five-way pipe 602, from which the cleaning fluid is evenly distributed to four guide pipes 603. The cleaning fluid in the guide pipes 603 enters the second five-way pipe 607 through the rotating pipe 604, and is evenly distributed to four outlet pipes 608. The cleaning fluid is then discharged through the holes in the outlet pipes 608. As the screening drum 501 rotates forward and the rotating pipe 604 rotates, the outlet pipes 608 and the partition 609 work together to evenly clean the wood chips. When it is necessary to soften the wood chips with steam, simply follow the same steps as above to insert the plug 711 into the rightmost limiting groove 714, so that the diverter 701 is in the softening position. Then, control the external steam generator to turn on and evenly discharge 100-110℃ saturated steam along the same path as above to steam treat the wood chips. When it is necessary to filter water from wood chips, simply follow the same steps as above and move the plug 711 into the leftmost initial limiting groove 714. At this time, the diversion frame 701 is in the water removal mode, and the high-speed airflow generated by the external air source is evenly discharged according to the same path as above. Combined with the forward rotation of the screening drum 501 and the rotation of the rotating tube 604, water stains on the surface of the wood chips are removed. After the pretreatment of the mixed wood chips is completed, the drive end of the electric cylinder in the feeding and turning device 2 is extended, and the outer cylinder 4 is turned 90 degrees by the waste discharge device 3 to cooperate with the rotation of the screening drum 501, so as to discharge the pretreated mixed wood chips inside the screening drum 501.

[0034] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A production process for a semi-needle poplar mixed pulp, characterized in that, Includes the following steps: S1. Based on the preset performance indicators of the finished pulp, precisely control the mixing ratio of semi-coniferous wood chips and poplar wood chips, and send the mixture to the raw material temporary storage warehouse for later use. S2. First, the mixed wood chips are sieved to remove impurities such as excessively fine wood powder and bark fragments. Then, the mud and dust adhering to the surface of the wood chips are rinsed to reduce the ineffective consumption of subsequent chemicals. After purification, the wood chips are sent into the pre-steam chamber and treated with saturated steam at 100-110℃ for 10-20 minutes. The heat softens the lignin in the wood and removes the air between the wood chips. S3. The pretreated mixed wood chips first enter the spiral extrusion preimpregnation machine and complete the first stage of preimpregnation under low temperature and low pressure conditions, so that the alkaline bleaching chemicals can initially penetrate and act on the fibers. After the first stage of preimpregnation, the wood chips are transferred to the high-pressure preimpregnation chamber for the second stage of preimpregnation in a high temperature and high pressure environment, which further removes some lignin and improves the whiteness of the wood chips. S4. The pre-impregnated wood chips are conveyed to a double-disc refiner for a coarse grinding process. The coarse grinding process initially separates the wood chips into fiber bundles and some individual fibers. After the coarse grinding is completed, the gap between the grinding discs is adjusted to perform a second fine grinding process to refine the fibers. S5. After refining, the pulp is sent to a stirred bleaching tank, where hydrogen peroxide and other bleaching agents are added to remove residual lignin and pigments through oxidation. After bleaching, the pH of the pulp is adjusted to a neutral range of 6.5-7.5 with dilute sulfuric acid to prevent fiber degradation. S6. After bleaching, the pulp is first treated by a pressure screen to separate impurities such as unground wood chips and coarse fiber bundles through the screen. Then the pulp enters a vacuum washing machine to wash away residual chemicals, dissolved lignin and small molecule impurities. S7. The washed pulp is transported to the thickening tank, where clean water is added to adjust the pulp concentration to 8%-10%. The qualified semi-spindle poplar mixed pulp is sent to the finished pulp tower for temporary storage. When production is needed, the pulp is transported to the papermaking workshop through pipelines or tank trucks.

2. The production apparatus used in the production process of semi-needle poplar mixed pulp as described in claim 1, comprising a base (1), characterized in that: The base (1) is provided with a feeding and turning device (2) at the top center, a waste discharge device (3) is provided at the top of the feeding and turning device (2), an outer cylinder (4) is provided at the top of the waste discharge device (3), a rotary drive assembly (5) and a synchronous turning and stirring assembly (6) are provided inside the outer cylinder (4), and a conveying and switching assembly (7) is provided on one side of the top of the base (1). The rotary drive assembly (5) includes a screening drum (501) and two symmetrically distributed guide rings (502). The two guide rings (502) are fixedly installed at both ends of the screening drum (501) by brackets, and the two guide rings (502) are rotatably installed on the inner wall of the outer cylinder (4). The synchronous flipping stirring assembly (6) includes an input cylinder (601), which is rotatably installed in the middle of one side of the outer cylinder (4). A No. 1 five-way pipe (602) is fixedly installed at the end of the input cylinder (601). A guide pipe (603) is connected through the four discharge ends of the No. 1 five-way pipe (602). A rotating pipe (604) is rotatably sealed to the inner wall of the other end of the guide pipe (603). A driven gear (605) is fixedly sleeved on the outer wall of the rotating pipe (604). A fixed toothed ring (606) that cooperates with the driven gear (605) is fixedly installed on the inner wall of the outer cylinder (4) through a bracket. The driven gear (605) and the inner side of the fixed toothed ring (606) are meshed and connected. The conveying switching assembly (7) includes a diversion frame (701), which is fixedly installed on the top of the base (1). A sliding shaft (702) is sealed and slidably inserted in the diversion frame (701). A first piston (703), a second piston (704), and a third piston (705) are respectively fixedly sleeved on the outer wall of the sliding shaft (702). The first piston (703), the second piston (704), and the third piston (705) are all slidably and sealedly connected to the diversion frame (701).

3. The production apparatus used in the production process of semi-needle poplar mixed pulp as described in claim 2, characterized in that, The inner wall of the outer cylinder (4) is rotatably mounted with a drive shaft (504) via a bearing seat. A drive gear (505) is fixedly mounted at the end of the drive shaft (504). An internal gear ring (503) is fixedly mounted on the inner wall of a guide ring (502) on one side of the drive shaft (504). The bottom of the drive gear (505) meshes with the internal gear ring (503). A servo motor (506) is fixedly mounted on the inner wall of the outer cylinder (4). The drive end of the servo motor (506) is connected to the drive shaft (504) via a coupling.

4. The production apparatus used in the production process of semi-needle poplar mixed pulp as described in claim 2, characterized in that, Two symmetrically distributed pulley frames (611) are fixedly installed on the inner wall of the outer cylinder (4). A rotating frame (610) is rotatably installed on the pulley frame (611). A guide pipe (603) passes through the inner side (610) of the rotating frame, and a rotating pipe (604) is rotatably installed on the rotating frame (610).

5. The production apparatus used in the production process of semi-needle poplar mixed pulp as described in claim 4, characterized in that, The rotating frame (610) is fixedly installed with a No. 2 five-way pipe (607) at its end. The four outlet ends of the No. 2 five-way pipe (607) are all connected to the outlet pipe (608). The outer wall of the outlet pipe (608) is securely installed with three partitions (609) arranged in a ring array by bolts.

6. The production apparatus used in the production process of semi-needle poplar mixed pulp as described in claim 2, characterized in that, The input cylinder (601) has a rotating sealing sleeve on one end of its outer wall with an inlet frame (613), and the inlet frame (613) is securely installed on the outer wall of the outer cylinder (4) by bolts.

7. The production apparatus used in the production process of semi-needle poplar mixed pulp as described in claim 2, characterized in that, The input end of the diversion box (701) is connected to the liquid inlet pipe (706), the air inlet pipe (707) and the steam pipe (708), respectively, and the output end of the diversion box (701) is connected to the manifold (709) which works in conjunction with the liquid inlet pipe (706), the air inlet pipe (707) and the steam pipe (708).

8. The production apparatus used in the production process of semi-needle poplar mixed pulp as described in claim 7, characterized in that, The top end of the manifold (709) is connected to a heat-resistant rubber hose (715), and the other end of the heat-resistant rubber hose (715) is connected to the liquid inlet end of the inlet frame (613).

9. The production apparatus used in the production process of semi-needle poplar mixed pulp as described in claim 2, characterized in that, The sliding shaft (702) is fixedly installed with a limiting frame (710) near the end of the steam pipe (708). A plug (711) is inserted through the limiting frame (710). A baffle (712) is fixedly sleeved on the outer wall of the plug (711), and the baffle (712) slides in the inner wall of the limiting frame (710). A return spring (713) is sleeved on the outer wall of the plug (711), and the two ends of the return spring (713) are fixedly connected to the baffle (712) and the inner wall of the limiting frame (710) respectively. Three limiting grooves (714) are opened on the base (1) at equal intervals to cooperate with the plug (711).

10. The production apparatus used in the production process of a semi-needle poplar mixed pulp as described in claim 5, characterized in that, An external gear ring (612) is fixedly sleeved on the outer wall of the inner side (610) of the rotating frame, and the external gear ring (612) is meshed with the top of the drive gear (505).

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