Paper pulp bleaching equipment and bleaching process thereof

Abstract

The invention relates to the technical field of paper pulp bleaching, and discloses paper pulp bleaching equipment and a bleaching process thereof.The paper pulp bleaching equipment comprises a bleaching tank, the circle center of the top face of the bleaching tank is rotationally connected with a cuboid driving block in a limiting mode, the bottom face of the driving block is provided with an opening, and a stirring frame assembly is slidably connected into the driving block in a lifting mode; the stirring frame assembly comprises a plurality of stirring frames, each stirring frame is a cuboid with the upper end and the lower end open, the adjacent upper stirring frame is arranged outside the lower stirring frame in a sleeving mode, the lower stirring frame is connected to the inner wall of the upper stirring frame in a sliding and lifting mode, and stirring plates are symmetrically and rotationally connected to the opposite side faces of each stirring frame. A driving rod is arranged in the stirring frame at the bottom in a sliding and lifting mode, a connecting rod is vertically fixed to the driving rod, and the end of the connecting rod is clamped to an inwards-concave sliding groove in the inner wall face of the bleaching tank in a limiting and sliding mode. The bleaching effect of the bleaching agent on paper pulp is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pulp bleaching, and in particular to a pulp bleaching device and a bleaching process thereof. Background Art

[0002] Pulp bleaching involves removing or modifying colored components from pulp through a series of processes to achieve the desired brightness. Bleaching can significantly reduce or remove lignin and resin from pulp, resulting in a clean, bright white pulp with enhanced stability and resistance to yellowing. Traditional bleaching equipment typically uses a single stirring rod with a limited stirring range. This results in a lengthy mixing process for the pulp and bleaching agent, reducing production efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a pulp bleaching device and a bleaching process thereof, which have high stirring efficiency, good bleaching effect and improved production efficiency.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: it includes a bleaching tank, the center of the circle on the top surface of the bleaching tank is limited and rotatably connected to a driving block with a rectangular parallelepiped arranged inside, the center of the circle on the top surface of the driving block is limited and rotatably connected to a feeding pipe 1, the bottom surface of the driving block is set to an opening, and a stirring frame assembly is slidably connected to the driving block, and the stirring frame assembly includes several stirring frames, the stirring frames are rectangular parallelepipeds with openings at both ends, the adjacent upper stirring frames are sleeved outside the lower stirring frame, and the lower stirring frame is slidably and lifted to be connected to the inner wall of the upper stirring frame, each stirring frame is symmetrically rotatably connected to a stirring plate on the relative sides, and a driving rod is slidably and lifted in the stirring frame at the bottom, and a connecting rod is vertically fixed on the driving rod, and the end of the connecting rod is limited and slidably engaged in the concave arc-shaped slide groove on the inner wall of the bleaching tank.

[0005] By adopting the above technical solution, since the stirring frame is set to be a rectangular shape, when the driving block rotates, it drives each stirring frame to rotate in turn from top to bottom, so the stirring plates on the symmetrical sides of the stirring frame stir the material in the bleaching tank when rotating. At the same time, since the connecting rod at the bottom is limited and clamped in the arc-shaped slide groove on the inner wall of the bleaching tank, starting from the bottom driving rod, when the driving rod is at the lowest end of the arc-shaped slide groove, it rotates and rises at the same time, and after entering the bottom stirring frame, the stirring frame enters the adjacent stirring frame from bottom to top at once. In this process, the stirring plates rotate and stir and mix the materials at different heights, which can improve the mixing degree of the materials at each height and significantly improve the bleaching effect of the bleaching agent on the pulp.

[0006] The present invention is further configured as follows: a groove 1 is provided on the driving rod and the top side of each stirring frame, a block 1 is horizontally slidably connected in the groove 1, the block 1 is fixed to the side of the rack, the rack is vertical, and a block 2 is vertically fixed to the other side of the rack relative to the block 1, the block 2 is engaged in the groove 2, the groove 2 is a parallelogram, the groove 2 includes a pair of vertical segment grooves and a pair of oblique grooves, and the two vertical segment grooves are away from the side of the inner wall of the stirring frame and are rotatably connected with gear 1 and gear 2 at the upper and lower ends respectively, the gear 1 is located above the gear 2, and the oblique groove gradually approaches the side of the gear 2 from the gear 1 in the direction approaching the driving block, and the opposite sides of the rack are provided with teeth, and the rack can mesh with gear 1 and gear 2 respectively.

[0007] The present invention is further configured as follows: gear one and gear two are coaxially fixed with rotating rod one and rotating rod two, respectively; one end of the two stirring plates are fixed with rotating rod three and rotating rod four, respectively; the ends of rotating rod one, rotating rod two, rotating rod three and rotating rod four located on the outer side of the stirring frame are respectively fixed with synchronous pulley one, synchronous pulley two, synchronous pulley three and synchronous pulley four, and the outer sleeves of synchronous pulley one, synchronous pulley two, synchronous pulley three and synchronous pulley four are provided with synchronous belt one.

[0008] When the gear train is in gear, the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, and the gear train is in gear, When the mixing plate rises and rotates, it is retracted and enters the mixing frame above. After entering the mixing frame at the highest end, the connecting rod reaches the highest point of the arc chute and then starts to descend from the highest point. When the driving rod starts to descend, all the mixing frames are in a stacked and retracted state. Under the action of gravity, the second mixing frame, all the mixing frames below and the driving rod descend from top to bottom. In the process of the second mixing frame coming out of the mixing frame at the highest point, the rack descends in the vertical section groove in the groove 2 near the gear 2 until it engages with the gear 2. The rack drives the gear 2 to rotate clockwise, and the synchronous pulley 2 rotates clockwise, driving the synchronous pulley 3 and the synchronous pulley 4 to rotate clockwise, so the two mixing plates rotate clockwise, the mixing plates open, and start to stir the materials again. And so on, in the process of the driving rod descending, the mixing plates on each mixing frame rotate and open while rotating until the driving rod rotates to the bottom. The above process is repeated, the material mixing degree is high, and the bleaching efficiency is significantly improved.

[0009] The present invention is further configured as follows: the second grooves adjacent to the inner wall of the stirring frame are arranged on opposite surfaces.

[0010] By adopting the above technical solution, the staggered arrangement is convenient for arrangement in space, ensuring that each stirring frame is provided with a plurality of stirring frames.

[0011] The present invention is further configured as follows: a stirring rod is connected to the bottom of the driving rod, the stirring rod is U-shaped, the two vertical rods of the stirring rod gradually move away from each other in the direction close to the driving block, and a scraper is provided on the end face of the stirring rod close to the inner wall of the bleaching tank.

[0012] By adopting the above technical solution, the driving rod drives the stirring rod to rise and rotate while rotating, and a variety of stirring tools are set to further improve the stirring efficiency. The scraper is set to prevent the pulp from adhering to the inner wall of the discharge hopper.

[0013] The present invention is further configured as follows: the chute includes two symmetrically arranged trough sections, trough section 1 and trough section 2, each of which occupies half of the inner wall surface of the bleaching tank, and the tops and bottoms of the trough sections 1 and 2 are connected in a one-to-one correspondence.

[0014] By adopting the above technical solution, the slide groove is set in a one-to-one connection between the head and the tail, ensuring that the driving rod can achieve reciprocating ascent and descent.

[0015] The present invention is further configured as follows: a material spraying port is provided on the side of the stirring frame close to the stirring plate.

[0016] By adopting the above technical solution, bleaching agent can be introduced into the driving block, enter each stirring frame in turn, and be sprayed out from the spray port. While the stirring frame rotates, the bleaching agent is sprinkled into the bleaching tank from the spray port under the action of centrifugal force. The bleaching agent with an increased surface area can improve the bleaching efficiency and enhance the bleaching effect. In addition, when the driving rod gradually rises, the volume of the driving frame gradually decreases, forming a certain pressure. The bleaching agent is pressurized and sprayed from the stirring frame into the bleaching tank, further improving the mixing degree of the bleaching agent and the material, thereby ensuring the bleaching efficiency of the product.

[0017] The present invention is further configured as follows: the bottom surface of the driving block is fixed to a rotating circular plate, a driven synchronous pulley is provided on the outer sleeve of the rotating circular plate, a driving motor is fixed on the top of the bleaching tank, a driving synchronous pulley is fixed on the output shaft of the driving motor, and the driving synchronous pulley and the driven synchronous pulley are connected by a synchronous belt 2.

[0018] By adopting the above technical solution, the driving motor actively rotates the synchronous pulley, which ultimately drives the rotating circular plate to rotate, and drives the driving block and the stirring frame to rotate.

[0019] The present invention is further configured as follows: a second feed pipe is connected to the side surface of the upper end of the bleaching tank, a discharge pipe is connected to the discharge hopper at the bottom of the bleaching tank, and a valve is provided on the discharge pipe.

[0020] By adopting the above technical solution, the pulp material is introduced into the second feed pipe and flows out from the discharge pipe after bleaching.

[0021] The present invention is further configured as follows: a pulp bleaching process comprises the following steps

[0022] S1, feeding the pulp to be bleached into the bleaching tank through the material feed pipe 2;

[0023] S2. Adjust the pulp concentration to ensure that the pulp concentration is between 10% and 15%;

[0024] S3, bleaching agent is added to the chlorine dioxide solution through the feed pipe 1, and at the same time the motor is started to drive the driving block to rotate, and the stirring frame in the bleaching tank begins to rotate;

[0025] S4. Start the heating tube on the side of the bleaching tank to control the temperature at 50-80°C, and heat and stir at this temperature for 40-60 minutes;

[0026] S5. The bleached pulp is discharged through a discharge pipe and then washed.

[0027] By adopting the above technical solution, the entire bleaching process is simple and efficient, and the bleaching efficiency is significantly improved.

[0028] The beneficial effects of the present invention are as follows: the stirring frame is arranged in a rectangular shape, so when the driving block rotates, each stirring frame is driven to rotate in turn from top to bottom, so the stirring plates on the symmetrical sides of the stirring frame stir the material in the bleaching tank when rotating, and at the same time, since the connecting rod at the bottom is limited and clamped in the arc-shaped chute on the inner wall of the bleaching tank, starting from the bottom driving rod, when the driving rod is at the lowest end of the arc-shaped chute, it rotates and rises, and after entering the bottom stirring frame, the stirring frame enters the adjacent stirring frame from bottom to top at once. In this process, the stirring plates rotate, stir and mix the materials at different heights, which can improve the mixing degree of the materials at each height and significantly improve the bleaching effect of the bleaching agent on the pulp. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 It is a structural diagram of the explosion of the bleaching tank body and the stirring frame assembly of the invention.

[0032] Figure 3 It is a schematic diagram of the cross-sectional structure of the bleaching tank body of the present invention.

[0033] Figure 4 It is a structural schematic diagram of the stirring frame assembly in the present invention.

[0034] Figure 5 yes Figure 4 Schematic diagram of the cross-section structure.

[0035] Figure 6 yes Figure 4 Schematic diagram of the explosion structure.

[0036] Figure 7 yes Figure 6Schematic diagram of the structure of a stirring frame.

[0037] In the figure, 1. bleaching tank; 2. driving block; 3. stirring frame; 4. stirring plate; 5. driving rod; 6. connecting rod; 7. chute; 71. trough section 1; 72. trough section 2; 8. groove 1; 9. clamping block 1; 10. rack; 11. clamping block 2; 12. groove 2; 121. vertical section trough; 122. inclined trough; 13. gear 1; 14. gear 2; 15. synchronous pulley 1; 16. synchronous pulley 2; 17. synchronous pulley 3; 18. synchronous pulley 4; 19. injection port; 20. driving motor; 21. synchronous belt 2; 22. feed pipe 1; 23. feed pipe 2; 24. discharge pipe; 25. valve; 26. stirring rod; 27. synchronous belt 1. DETAILED DESCRIPTION

[0038] The technical solutions of the present invention will be described clearly and completely below with reference to specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0039] Embodiment, a pulp bleaching device, such as Figure 1-7 As shown, it includes a bleaching tank 1, the center of the top surface of the bleaching tank 1 is limited and rotatably connected to a driving block 2 with a rectangular parallelepiped provided inside, the center of the top surface of the driving block 2 is limited and rotatably connected to a feeding pipe 22, the bottom surface of the driving block 2 is set to be open, and the driving block 2 is connected to a stirring frame 3 assembly for lifting and sliding. The stirring frame 3 assembly includes several stirring frames 3, and the stirring frame 3 is a rectangular parallelepiped with openings at both ends. The adjacent upper stirring frame 3 is sleeved on the outside of the lower stirring frame 3, and the lower stirring frame 3 is slidably and lifted to be connected to the inner wall of the upper stirring frame 3. Each stirring frame 3 is symmetrically rotated on the relative sides and is connected to a stirring plate 4. A driving rod 5 is slidably and lifted in the stirring frame 3 at the bottom, and a connecting rod 6 is vertically fixed on the driving rod 5. The end of the connecting rod 6 is limited and slidably clamped on the inner wall of the bleaching tank 1 The concave arc chute 7, since the stirring frame 3 is set to a rectangular shape, when the driving block 2 rotates, it drives each stirring frame 3 to rotate in turn from top to bottom, so the stirring plates 4 on the symmetrical sides of the stirring frame 3 stir the material in the bleaching tank 1 when rotating. At the same time, since the connecting rod 6 at the bottom is limited and engaged in the arc chute 7 on the inner wall of the bleaching tank 1, starting from the bottom driving rod 5, the driving rod 5 is at the lowest end of the arc chute 7, while rotating and rising. After entering the bottom stirring frame 3, the stirring frame 3 enters the adjacent stirring frame 3 from bottom to top at once. In this process, the stirring plate 4 rotates and stirs the materials at different heights, which can improve the mixing degree of the materials at each height and significantly improve the bleaching effect of the bleaching agent on the pulp.

[0040] like Figure 1-7As shown, the driving rod 5 and the top side of each stirring frame 3 are provided with a groove 8, and a block 9 is horizontally slidably connected in the groove 8. The block 9 is fixed to the side of the rack 10, and the rack 10 is vertical. A block 2 11 is vertically fixed to the other side of the rack 10 relative to the block 1 9. The block 2 11 is engaged in the groove 2 12. The groove 2 12 is a parallelogram. The groove 2 12 includes a pair of vertical segment grooves 121 and a pair of inclined grooves 122. The two vertical segment grooves 121 are away from the inner wall of the stirring frame 3 on the side, and the upper and lower ends thereof are respectively rotatably connected with a gear 13 and a gear 2 14. The gear 13 is located above the gear 2 14, and the inclined groove 122 is automatically rotated in the direction close to the driving block 2. Gear 1 13 gradually approaches one side of gear 2 14, and teeth are provided on the opposite sides of rack 10, and rack 10 can mesh with gear 1 13 and gear 2 14 respectively. Gear 1 13 and gear 2 14 are coaxially fixed with rotating rod 1 and rotating rod 2 respectively, and one end of two stirring plates 4 is fixed with rotating rod 3 and rotating rod 4 respectively. The ends of rotating rod 1, rotating rod 2, rotating rod 3 and rotating rod 4 located on the outer side of stirring frame 3 are respectively fixed with synchronous pulley 15, synchronous pulley 2 16, synchronous pulley 3 17 and synchronous pulley 4 18. The outer sleeves of synchronous pulley 15, synchronous pulley 2 16, synchronous pulley 3 17 and synchronous pulley 4 18 are provided with synchronous belt 1 27. When driving rod When the rack 10 gradually rises from the bottom of the chute 7, the rack 10 on the side of the driving rod 5 is brought up and enters the adjacent mixing frame 3 above. The block 2 11 on the side of the rack 10 first rises in the vertical section groove 121 in the groove 2 12 near the gear 1 13. When it rises to engage with the gear 1 13, the rack 10 drives the gear 1 13 to rotate counterclockwise, and the synchronous pulley 1 15 rotates counterclockwise, driving the synchronous pulley 3 17 and the synchronous pulley 4 18 to rotate counterclockwise, so the two mixing plates 4 rotate counterclockwise, from the initial expanded state, to fit the outer side of the mixing frame 3. As the rack 10 rises further, the block 2 11 on the side of the rack 10 is in the inclined groove 1 22 end slides, because the block 19 on the side of the rack 10 is in the groove 18, the rack 10 can rise and slide horizontally until it slides to the connection between the inclined groove 122 section and the top of another vertical groove. At this time, the driving rod 5 reaches the highest point of the mixing frame 3; then the driving rod 5 rises further, and the driving rod 5 drives the mixing frame 3 at the bottom end to enter the second-to-last mixing frame 3 from the bottom up, and the mixing plates 4 on both sides of the second-to-last mixing frame 3 are raised and rotated, and then retracted and entered into the mixing frame 3 above. After entering the mixing frame 3 at the highest end, the connecting rod 6 reaches the highest point of the arc-shaped slide 7, and then starts to descend from the highest point;When the driving rod 5 begins to descend, all the mixing frames 3 are in a stacked and retracted state. Under the action of gravity, the second mixing frame 3 from top to bottom, together with all the mixing frames 3 below and the driving rod 5, descends. As the second mixing frame 3 comes out of the mixing frame 3 at the highest point, the rack 10 descends in the vertical section groove 121 in the groove 2 12 near the gear 2 14 until it meshes with the gear 2 14. The rack 10 drives the gear 2 14 to rotate clockwise, and the synchronous pulley 2 16 rotates clockwise, driving the synchronous pulley 3 17 and the synchronous pulley 4 18 to rotate clockwise. Therefore, the two stirring plates 4 rotate clockwise, the stirring plates 4 open, and the materials begin to be stirred again. And so on. As the driving rod 5 descends, the stirring plates 4 on each stirring frame 3 rotate and open at the same time until the driving rod 5 rotates to the bottom. The above process is repeated, the material mixing degree is high, and the bleaching efficiency is significantly improved.

[0041] like Figure 1-7 As shown, the grooves 12 on the inner walls of adjacent stirring frames 3 are arranged on opposite surfaces and staggered, which is convenient for arrangement in space and ensures that each stirring frame 3 has a groove 12 on it.

[0042] like Figure 1-7 As shown, a stirring rod 26 is connected to the bottom of the driving rod 5. The stirring rod 26 is U-shaped. The two vertical rods of the stirring rod 26 gradually move away from each other in the direction close to the driving block 2. A scraper is provided on the end face of the stirring rod 26 close to the inner wall of the bleaching tank 1. The driving rod 5 drives the stirring rod 26 to rise and rotate while rotating upward. A variety of stirring tools are provided to further improve the stirring efficiency. The scraper is provided to prevent the pulp from adhering to the inner wall of the discharge hopper.

[0043] like Figure 1-7 As shown, the chute 7 includes two symmetrically arranged chute sections 1 71 and 72. The chute sections 1 71 and 72 each occupy half of the inner wall surface of the bleaching tank 1. The tops and bottoms of the chute sections 1 71 and 72 are connected in a one-to-one correspondence. The chute 7 is arranged in a one-to-one correspondence between the head and the tail to ensure that the driving rod 5 can achieve reciprocating ascent and descent.

[0044] like Figure 1-7 As shown, a spray port 19 is provided on the side of the stirring frame 3 near the stirring plate 4. The bleaching agent can be introduced into the driving block 2, enters each stirring frame 3 in turn, and is sprayed out from the spray port 19. While the stirring frame 3 is rotating, the bleaching agent is sprinkled into the bleaching tank 1 from the spray port 19 under the action of centrifugal force. The bleaching agent with an increased surface area can improve the bleaching efficiency and the bleaching effect. In addition, when the driving rod 5 gradually rises, the volume of the driving frame gradually decreases, forming a certain pressure. The bleaching agent is pressurized and sprayed from the stirring frame 3 into the bleaching tank 1, further improving the mixing degree of the bleaching agent and the material, thereby ensuring the bleaching efficiency of the product.

[0045] like Figure 1-7As shown, the bottom surface of the driving block 2 is fixed on the rotating circular plate, and the outer sleeve of the rotating circular plate is provided with a driven synchronous pulley. The driving motor 20 is fixed on the top of the bleaching tank 1, and the active synchronous pulley is fixed on the output shaft of the driving motor 20. The active synchronous pulley and the driven synchronous pulley are connected by a synchronous belt 21. The active synchronous pulley of the driving motor 20 rotates, and finally drives the rotating circular plate to rotate, driving the driving block 2 and the stirring frame 3 to rotate.

[0046] like Figure 1-7 As shown, a second feed pipe 23 is connected to the side of the upper end of the bleaching tank 1, and a discharge pipe 24 is connected to the discharge hopper at the bottom of the bleaching tank 1. A valve 25 is provided on the discharge pipe 24. The second feed pipe 23 is used to allow pulp material to flow into the feed pipe 23, and the pulp flows out from the discharge pipe 24 after bleaching is completed.

[0047] A pulp bleaching process:

[0048] S1, the pulp to be bleached is introduced into the bleaching tank 1 through the material feed pipe 23;

[0049] S2. Adjust the pulp concentration to ensure that the pulp concentration is between 10% and 15%;

[0050] S3, bleaching agent is added to the chlorine dioxide solution through the feed pipe 22, and the motor is started to drive the driving block 2 to rotate, and the stirring frame 3 in the bleaching tank 1 starts to rotate;

[0051] S4, start the heating tube on the circumferential side of the bleaching tank 1 to control the temperature at 50°C-80°C, and heat and stir at this temperature for 40-60 minutes;

[0052] S5. The bleached pulp is discharged through the discharge pipe 24 and then washed.

Claims

1. A pulp bleaching device, characterized in that: The invention comprises a bleaching tank (1), wherein a driving block (2) in the shape of a rectangular parallelepiped is rotatably connected to the top surface of the bleaching tank (1) in a limited position at the center thereof, a feeding pipe (22) is rotatably connected to the top surface of the driving block (2) in a limited position at the center thereof, the bottom surface of the driving block (2) is arranged to be open, a stirring frame (3) component is slidably connected to the inside of the driving block (2), the stirring frame (3) component comprises a plurality of stirring frames (3), the stirring frames (3) are rectangular parallelepipeds with openings at the upper and lower ends, and the adjacent upper The stirring frame (3) is sleeved outside the stirring frame (3) below. The stirring frame (3) below is slidably raised and lowered to be connected to the inner wall of the stirring frame (3) above. Each stirring frame (3) is symmetrically rotated relative to the side and is connected to a stirring plate (4). A driving rod (5) is slidably raised and lowered inside the stirring frame (3) at the bottom. A connecting rod (6) is vertically fixed on the driving rod (5). The end of the connecting rod (6) is limitedly slidably engaged with an inwardly concave arc-shaped slide groove (7) on the inner wall surface of the bleaching tank (1).

2. A pulp bleaching equipment according to claim 1, characterized in that: The driving rod (5) and the top side of each stirring frame (3) are provided with a groove (8), and a clamping block (9) is horizontally slidably connected in the groove (8), and the clamping block (9) is fixed to the side of the rack (10), and the rack (10) is vertical. A clamping block (11) is vertically fixed to the other side of the rack (10) relative to the clamping block (9), and the clamping block (11) is clamped in the groove (12), and the groove (12) is a parallelogram. The groove (12) includes a pair of vertical segment grooves (12 1) and a pair of inclined grooves (122), the two vertical section grooves (121) are away from the side of the stirring frame (3) and the upper and lower ends of the inner wall are respectively rotatably connected with a gear one (13) and a gear two (14), the gear one (13) is located above the gear two (14), and the inclined groove (122) gradually approaches the gear two (14) from the gear one (13) along the direction close to the driving block (2), and the opposite side surfaces of the rack (10) are provided with teeth, and the rack (10) can be respectively meshed with the gear one (13) and the gear two (14).

3. A pulp bleaching equipment according to claim 2, characterized in that: The gear 1 (13) and the gear 2 (14) are coaxially fixed with a rotating rod 1 and a rotating rod 2, respectively; one end of the two stirring plates (4) is fixed with a rotating rod 3 and a rotating rod 4, respectively; the ends of the rotating rod 1, the rotating rod 2, the rotating rod 3 and the rotating rod 4 located on the outer side of the stirring frame (3) are respectively fixed with a synchronous belt pulley 1 (15), a synchronous belt pulley 2 (16), a synchronous belt pulley 3 (17) and a synchronous belt pulley 4 (18); and the outer sleeves of the synchronous belt pulley 1 (15), the synchronous belt pulley 2 (16), the synchronous belt pulley 3 (17) and the synchronous belt pulley 4 (18) are provided with a synchronous belt 1 (27).

4. A pulp bleaching equipment according to claim 3, characterized in that: The second groove (12) adjacent to the inner wall of the stirring frame (3) is arranged on the opposite surface.

5. A pulp bleaching equipment according to claim 4, characterized in that: The bottom of the driving rod (5) is connected to a stirring rod (26), the stirring rod (26) is U-shaped, and the two vertical rods of the stirring rod (26) gradually move away from each other in a direction close to the driving block (2), and a scraper is provided on the end surface of the stirring rod (26) close to the inner wall surface of the bleaching tank (1).

6. A pulp bleaching equipment according to claim 5, characterized in that: The chute (7) comprises two symmetrically arranged chute sections 1 (71) and chute section 2 (72), wherein the chute section 1 (71) and the chute section 2 (72) each occupy half of the inner wall surface of the bleaching tank (1), and the tops and bottoms of the chute sections 1 (71) and chute section 2 (72) are connected in a one-to-one correspondence.

7. A pulp bleaching equipment according to claim 6, characterized in that: A material injection port (19) is provided on the side of the stirring frame (3) close to the stirring plate (4).

8. A pulp bleaching equipment according to claim 7, characterized in that: The bottom surface of the driving block (2) is fixed to a rotating circular plate, the outer cover of the rotating circular plate is provided with a driven synchronous belt wheel, the top of the bleaching tank (1) is fixed with a driving motor (20), the output shaft of the driving motor (20) is fixed with a driving synchronous belt wheel, and the driving synchronous belt wheel and the driven synchronous belt wheel are connected via a second synchronous belt (21).

9. A pulp bleaching equipment according to claim 8, characterized in that: A second feed pipe (23) is connected to the side of the upper end of the bleaching tank (1), a discharge pipe (24) is connected to the discharge hopper at the bottom of the bleaching tank (1), and a valve (25) is provided on the discharge pipe (24).

10. A pulp bleaching process using the bleaching equipment according to any one of claims 1 to 9, characterized in that: The following steps are included S1, introducing the pulp to be bleached into the bleaching tank (1) through the material feed pipe 2 (23); S2. Adjust the pulp concentration to ensure that the pulp concentration is between 10% and 15%; S3, bleaching agent is added to the chlorine dioxide solution through the feed pipe 1 (22), and at the same time, the motor is started to drive the driving block (2) to rotate, and the stirring frame (3) in the bleaching tank (1) starts to rotate; S4, start the heating tube on the circumferential side of the bleaching tank (1) to control the temperature at 50°C-80°C, and heat and stir at this temperature for 40-60 minutes; S5, the bleached pulp is discharged through the discharge pipe (24) and then washed.

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