Double-roller extrusion concentration equipment for efficient dehydration of chemi-mechanical pulp

Abstract

The invention discloses double-roller extrusion concentration equipment for efficient dehydration of chemi-mechanical pulp, and relates to the technical field of pulping and papermaking. The preliminary extrusion mechanism is arranged in the side, below the feeding port, of the operation box, and a conveying mechanism is arranged below one side of the preliminary extrusion mechanism; the extrusion rollers are symmetrically arranged on the side, away from the preliminary extrusion mechanism, in the operation box, rotating shafts on the front side and the rear side of the extrusion roller on the lower side are rotationally connected to the side wall of the operation box through bearings, and the extrusion roller on the upper side is connected with the side wall of the operation box through an adjusting mechanism. An output shaft of the driving motor is connected with the extrusion roller on the lower side through a synchronous wheel transmission assembly; the linkage mechanism is arranged on the rear side wall of the operation box and connected with the rotating shafts on the rear sides of the two extrusion rollers. Through primary extrusion and a linkage extrusion mechanism with adjustable double-roller pressure, graded high-efficiency dehydration of the chemimechanical pulp is realized, the discharge dryness and dehydration uniformity are remarkably improved, meanwhile, different pulp characteristics can be flexibly adapted, and the energy consumption per unit yield is reduced.

Description

Technical Field

[0001] This invention relates to the field of pulp and paper technology, specifically to a two-roll extrusion thickening device for efficient dewatering of chemimechanical pulp. Background Technology

[0002] In the production of chemimechanical pulp, efficient dewatering is a key step in reducing energy consumption and improving pulp quality. Currently, commonly used dewatering equipment, such as single-roll presses or screw extruders, suffers from uneven dewatering, high energy consumption, and poor adaptability to high-concentration pulps. Especially when processing high-viscosity chemimechanical pulps, traditional equipment is prone to problems such as clogged filter channels, unstable extrusion pressure, and difficulty in accurately controlling pulp layer thickness, resulting in low dewatering efficiency and pulp dryness failing to meet the requirements of subsequent processes. Furthermore, the pressure adjustment of existing equipment is not flexible enough, failing to quickly optimize dewatering parameters according to different raw material characteristics, thus affecting the continuity and stability of production. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a well-designed and easy-to-use double-roller extrusion thickening device for efficient dewatering of chemimechanical pulp. Through a linkage extrusion mechanism with adjustable pressure between the initial extrusion and the double rollers, it achieves efficient dewatering of chemimechanical pulp by gradation, significantly improving the dryness and uniformity of the output, while flexibly adapting to different pulp characteristics and reducing energy consumption per unit output.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: it comprises an operating box, supporting feet, and a discharge pipe; supporting feet are fixed at the four corners of the bottom wall of the operating box; a feed inlet is provided on one side of the top wall of the operating box; a liquid outlet pipe and a discharge pipe are respectively provided on both sides of the bottom wall of the operating box; a partition is provided between the liquid outlet pipe and the discharge pipe; it further comprises: A preliminary extrusion mechanism is provided on the side of the control box located below the feed inlet. A conveying mechanism is provided below the side of the preliminary extrusion mechanism and is connected to the side wall of the control box. The extrusion rollers are two in number and are symmetrically arranged inside the operating box on the side away from the initial extrusion mechanism. The lower extrusion roller abuts against the upper side of the partition. The rotating shafts on the front and rear sides of the lower extrusion roller are screwed to the side wall of the operating box through bearings, and the rotating shaft on the rear side of the extrusion roller is exposed on the outer side of the rear side wall of the operating box. The upper extrusion roller is connected to the side wall of the operating box through an adjustment mechanism. The drive motor is fixed to the outer bottom wall of the control box by a bracket, and the output shaft of the drive motor is connected to the lower extrusion roller through a synchronous pulley transmission assembly. The linkage mechanism is located on the rear side wall of the control box and is connected to the rotating shafts on the rear side of the two extrusion rollers. With the above technical solution, the material enters the operating box through the feed inlet and undergoes preliminary compression through the preliminary compression mechanism. After compression, the raw material falls onto the conveying mechanism and is transported between the upper and lower compression rollers. According to the required degree of compression, the position of the upper compression roller is adjusted by the adjusting mechanism. The drive motor is started, and the drive motor drives the lower compression roller to rotate through the synchronous wheel transmission assembly. The lower compression roller drives the upper compression roller to rotate through the linkage mechanism, so that the two compression rollers compress the material. Finally, the material is discharged through the discharge pipe, and the squeezed liquid is discharged through the liquid outlet pipe.

[0005] As a further improvement of the present invention, guide plates are fixed on both sides of the partition. The other side of the guide plate is tilted downward and fixed on the inner bottom wall of the operation box. The side of the guide plate that is tilted downward is located on the side above the liquid outlet pipe and the material outlet pipe, respectively. The above technical solution facilitates the guidance of liquids and extruded materials, preventing stagnation.

[0006] As a further improvement of the present invention, the preliminary extrusion mechanism includes: The filter support plate is located on the lower side of the feed inlet. The front and rear sides of the filter support plate are fixed to the front and rear inner walls of the operating box. The center of the filter support plate is arc-shaped. Both sides of the filter support plate are inclined upwards. After the filter support plate is inclined upwards on the side away from the extrusion roller, it is fixed to the inner top wall of the operating box. The pressure roller is set inside the arc-shaped edge of the filter support plate. The front and rear ends of the pressure roller are respectively screwed into the front and rear side walls of the operation box through bearings. One end of the pressure roller is connected to the rotating shaft on the lower extrusion roller through a synchronous wheel transmission assembly. The guide plate is fixed on the inclined side of the other side of the filter support plate. After the other side of the guide plate is inclined downward, it is suspended on the upper side of the conveying mechanism. A baffle is fixed on the lower side wall of the guide plate, and the baffle is set to cooperate with the conveying mechanism to abut against each other. With the above technical solution, when the extrusion roller rotates, it drives the pressure roller to rotate through the synchronous wheel transmission assembly. The material entering the operating box falls onto the filter support plate. When the pressure roller rotates, it squeezes and conveys the material, so that the moisture in the material passes through the filter support plate and drips to the lower side of the operating box. The material is then guided by the guide plate to fall onto the conveying mechanism for transport. The baffle can prevent the material from falling directly from the conveying mechanism to the lower side of the operating box.

[0007] As a further improvement of the present invention, the conveying mechanism includes: The conveyor belt is located below the guide plate. One side of the outer surface of the conveyor belt abuts against the baffle. The conveyor belt is symmetrically arranged with drive wheels inside. The front and rear ends of the drive wheels are respectively screwed to the front and rear inner walls of the operating box through bearings. One end of one drive wheel is connected to the rotating shaft of one end of the extrusion roller below through a synchronous pulley transmission assembly. The conveying platform is positioned between the outer side of the conveyor belt and the lower extrusion roller, and the front and rear sides of the conveying platform are fixed to the front and rear inner walls of the control box, respectively. The support platform is set inside the conveyor belt, and the upper surface of the support platform is in contact with the inner belt surface on the upper side of the conveyor belt. The support platform is provided with several conical drainage holes arranged in a matrix. With the above technical solution, when the extrusion roller rotates, the synchronous wheel transmission assembly drives the connected transmission wheel to rotate. The cooperation of the two transmission wheels causes the conveyor belt to rotate. When the conveyor belt rotates, it drives the material to move between the two extrusion rollers. The moisture in the material can pass through the drainage holes on the support platform and drip down the conveyor belt to the lower side of the operating box.

[0008] As a further improvement of the present invention, a wiping roller is abutting on the outer belt surface on the lower side of the conveyor belt. The front and rear ends of the wiping roller are respectively screwed onto the front and rear inner walls of the operation box through bearings. One end of the wiping roller is connected to one of the transmission wheels through a synchronous wheel transmission assembly. With the above technical solution, when the transmission wheel rotates, the wiping roller is driven to rotate through the synchronous wheel transmission assembly, so that the conveyor belt can be wiped by the wiping roller, thus avoiding the mesh of the conveyor belt from being blocked.

[0009] As a further improvement of the present invention, the adjusting mechanism includes: The sliding blocks are two in number and are respectively screwed onto the rotating shafts on the front and rear sides of the upper extrusion roller via bearings. The sliding blocks are slidably disposed in the sliding grooves on the front and rear inner walls of the operating box. The adjusting blocks are two in number and are symmetrically fixed on the two side walls of one of the sliding blocks. The adjusting blocks are slidably disposed in the adjusting grooves on the inner wall of the sliding groove. Each adjusting block is screwed with an adjusting screw, which is screwed to the adjusting groove through a bearing. The two adjusting screws are connected to each other through a synchronous pulley transmission assembly. The adjusting rod is screwed onto the side wall of the control box via a bearing. The adjusting rod is connected to the lower end of one of the adjusting screws via a worm gear pair. A rotating disk is sleeved and fixed on the outer end of the adjusting rod. With the above technical solution, rotating the rotating disk drives the adjusting rod to rotate. The adjusting rod drives the adjusting screw connected to it to rotate through the worm gear pair. The adjusting screw drives another adjusting screw to rotate. The two adjusting screws drive the adjusting block to move through the thread. The adjusting block drives the sliding block to move. The sliding block drives the upper extrusion roller to move up and down until the extrusion roller moves to the appropriate position.

[0010] As a further improvement of the present invention, a graphite waterproof pad is fixed on the rear end wall of the upper extrusion roller, and the graphite waterproof pad is located on the outside of the groove on the inner wall of the operating box. The above technical solution can cover the sliding groove on the inner wall of the control box, preventing the squeezed water from entering the sliding groove.

[0011] As a further improvement of the present invention, the linkage mechanism includes: The drive gear is sleeved and fixed on the rotating shaft at the rear end of the lower extrusion roller. A first connecting plate is sleeved on the rear side of the drive gear and screwed to the rear end of the rotating shaft of the extrusion roller through a bearing. A first linkage gear is screwed to the other side of the first connecting plate through a shaft. The first linkage gear meshes with the drive gear. The second linkage gear meshes with the first linkage gear on the side away from the driving gear, and the first linkage gear and the second linkage gear are hinged together by the second connecting plate. Driven gear, the driven gear is sleeved and fixed on the rotating shaft at the rear end of the upper extrusion roller, the driven gear is meshed with the second linkage gear, and a third connecting plate is sleeved on the rear side of the driven gear and screwed to the rear end of the extrusion roller rotating shaft through a bearing, the third connecting plate is screwed to the shaft on the second linkage gear through a bearing. With the above technical solution, when the lower extrusion roller rotates, it drives the drive gear to rotate; the drive gear drives the first linkage gear, the first linkage gear drives the second linkage gear, and finally transmits to the driven gear. Through the cooperation of the first linkage gear and the second linkage gear, the drive gear and the driven gear rotate in opposite directions, thereby driving the two extrusion rollers to rotate in opposite directions to achieve material extrusion. When the position of the upper extrusion roller needs to be adjusted, the movement of the upper extrusion roller will cause one end of the No. 3 connecting plate to move accordingly, which in turn causes the other end of the No. 3 connecting plate to push the No. 2 linkage gear to rotate around the axis of the upper roller. At the same time, with the length of the No. 2 connecting plate fixed, the No. 1 linkage gear will also rotate accordingly. Since the No. 1 linkage gear is connected to the lower extrusion roller through the No. 1 connecting plate with a fixed length, the No. 1 linkage gear will rotate around the axis of the lower extrusion roller. This linkage design ensures that the driving gear, the first linkage gear, the second linkage gear, and the driven gear always remain in a meshed state, and that adjusting the position of the upper roller will not affect the rotational transmission and extrusion function of the two rollers.

[0012] As a further improvement of the present invention, the outer side of the linkage mechanism is provided with a protective cover, which is fixed on the outer wall of the rear side of the operation box. The rotating shaft of the rear side of the lower extrusion roller is screwed onto the rear wall of the protective cover through a bearing, and the rotating shaft of the rear end of the upper extrusion roller is inserted into the strip groove on the inner rear wall of the protective cover. The above technical solutions can protect the linkage mechanism and increase the service life of the gears.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The combination of pre-pressing by the pressure roller and fine pressing by the main extrusion roller significantly improves dewatering efficiency. Initial extrusion quickly removes water, while the main roller completes deep pressing, forming a continuous dewatering process. 2. The adjusting screw can precisely adjust the height of the upper extrusion roller to change the pressure, and the linkage gear mechanism can adapt to the change of clearance to ensure that the transmission is always stable and reliable when adjusting the pressure; 3. The material undergoes solid-liquid separation through a multi-stage structure, and the synchronously driven wiping rollers automatically clean the conveyor belt to prevent blockage and maintain unobstructed dehydration channels; 4. From feeding to dry and wet discharge, all processes are completed in a single machine by the same motor, achieving full automation, with a compact structure and high efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0016] Figure 3 This is a schematic diagram of the preliminary extrusion mechanism in this invention.

[0017] Figure 4 This is a schematic diagram of the filter support plate structure in this invention.

[0018] Figure 5 This is an exploded view of the conveying mechanism in this invention.

[0019] Figure 6 This is an exploded view of the extrusion roller, adjustment mechanism, and linkage mechanism in this invention.

[0020] Figure 7 for Figure 6 Enlarged view of section A.

[0021] Figure 8 This is a schematic diagram of the linkage mechanism in this invention.

[0022] Explanation of reference numerals in the attached figures: 1. Control box, 1-1 feed inlet, 2. support foot, 3. discharge pipe, 4. liquid outlet pipe, 5. partition plate, 6. preliminary extrusion mechanism, 6-1 filter support plate, 6-2 pressure roller, 6-3 guide plate, 6-4 baffle, 7. conveying mechanism, 7-1 conveyor belt, 7-2 drive wheel, 7-3 conveying platform, 7-4 support platform, 7-4 drain hole, 8. extrusion roller, 9. adjusting mechanism, 9-1 sliding block, 9-2 adjusting screw, 9-3 adjusting rod, 9-5 rotating disk, 10. drive motor, 11. linkage mechanism, 11-1 drive gear, 11-2 connecting plate 1, 11-3 linkage gear 1, 11-4 linkage gear 1, 11-5 connecting plate 1, 11-6 driven gear, 11-7 connecting plate 1, 12 guide plate, 13 wiping roller, 14 graphite waterproof pad, 15. protective cover. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0024] like Figures 1-8 As shown, this embodiment includes an operating box 1, support feet 2, and a discharge pipe 3. Support feet 2 are welded and fixed to the four corners of the outer bottom wall of the operating box 1. An inlet 1-1 is provided on the left side of the top wall of the operating box 1. A liquid outlet pipe 4 and a discharge pipe 3 are respectively provided on both sides of the bottom wall of the operating box 1, with a partition 5 between them. Guide plates 12 are welded and fixed to both sides of the partition 5. The other side of the guide plate 12 is inclined downwards and welded and fixed to the inner bottom wall of the operating box 1. The downward-inclined side of the guide plate 12 is located above the liquid outlet pipe 4 and the discharge pipe 3, which facilitates the guidance of liquid and extruded material, preventing stagnation. It also includes: The preliminary extrusion mechanism 6 is located on the side of the operation box 1 below the feed inlet 1-1. A conveying mechanism 7 is located on the lower right side of the preliminary extrusion mechanism 6 and is connected to the side wall of the operation box 1. Two extrusion rollers 8 are symmetrically arranged inside the operating box 1 on the side away from the initial extrusion mechanism 6. The lower extrusion roller 8 abuts against the upper side of the partition plate 5. The rotating shafts on the front and rear sides of the lower extrusion roller 8 are screwed to the side wall of the operating box 1 through bearings, and the rotating shaft on the rear side of the extrusion roller 8 is exposed on the outer side of the rear side wall of the operating box 1. The upper extrusion roller 8 is connected to the side wall of the operating box 1 through the adjusting mechanism 9. A graphite waterproof pad 14 is adhered and fixed on the rear end wall of the upper extrusion roller 8. The graphite waterproof pad 14 is located on the outer side of the slide groove on the inner wall of the operating box 1, which can block the slide groove on the inner wall of the operating box 1 to prevent the water squeezed out from entering the slide groove. The drive motor 10 is fixed to the outer bottom wall of the operation box 1 by a bracket, and the output shaft of the drive motor 10 is connected to the lower extrusion roller 8 through a synchronous pulley transmission assembly. The linkage mechanism 11 is located on the rear side wall of the operation box 1. The linkage mechanism 11 is connected to the rotating shafts on the rear side of the two extrusion rollers 8. A protective cover 15 is provided on the outer side of the linkage mechanism 11. The protective cover 15 is fixed to the outer side wall of the rear side of the operation box 1 by bolts. The rotating shaft on the rear side of the lower extrusion roller 8 is screwed onto the rear side wall of the protective cover 15 by bearings. The rotating shaft at the rear end of the upper extrusion roller 8 is inserted into the strip groove on the inner rear wall of the protective cover 15. This can protect the linkage mechanism 11 and increase the service life of the gears. Example 2:

[0025] See Figure 2-4 As shown, based on Embodiment 1, the preliminary extrusion mechanism 6 includes: The filter support plate 6-1 is located on the lower side of the feed inlet 1-1. The front and rear sides of the filter support plate 6-1 are welded and fixed to the front and rear inner walls of the operation box 1. The center of the filter support plate 6-1 is arc-shaped. Both sides of the filter support plate 6-1 are inclined upwards. After the left side of the filter support plate 6-1 is inclined upwards, it is welded and fixed to the inner top wall of the operation box 1. The pressure roller 6-2 is set inside the arc-shaped edge of the filter support plate 6-1. The front and rear ends of the pressure roller 6-2 are respectively screwed into the front and rear side walls of the operation box 1 through bearings. The rear end of the pressure roller 6-2 is connected to the rotating shaft on the lower extrusion roller 8 through a synchronous wheel transmission assembly. Guide plate 6-3 is welded and fixed to the inclined side of the right side of filter support plate 6-1. After the right side of guide plate 6-3 is inclined downward, it is suspended on the upper side of conveying mechanism 7. Baffle 6-4 is welded and fixed to the lower side wall of guide plate 6-3. Baffle 6-4 is set to cooperate with conveying mechanism 7 to abut against each other. Example 3:

[0026] See Figure 2 , Figure 5 As shown, based on Embodiment 2, the conveying mechanism 7 includes: A conveyor belt 7-1 is located below the guide plate 6-3. The left side of the outer surface of the conveyor belt 7-1 abuts against the baffle 6-4. Inside the conveyor belt 7-1, symmetrically arranged drive wheels 7-2 are mounted. The front and rear ends of the drive wheels 7-2 are respectively screwed onto the front and rear inner walls of the operating box 1 via bearings. The front end of the right drive wheel 7-2 is connected to the rotating shaft at the front end of the lower extrusion roller 8 via a synchronous wheel transmission assembly. A wiping roller 13 abuts against the outer surface of the lower side of the conveyor belt 7-1. The front and rear ends of the wiping roller 13 are respectively screwed onto the front and rear inner walls of the operating box 1 via bearings. One end of the wiping roller 13 is connected to the left drive wheel 7-2 via a synchronous wheel transmission assembly. When the drive wheel 7-2 rotates, it drives the wiping roller 13 to rotate via the synchronous wheel transmission assembly, thereby wiping the conveyor belt 7-1 and preventing the mesh of the conveyor belt 7-1 from being blocked. The conveying platform 7-3 is positioned between the right side of the outer surface of the conveyor belt 7-1 and the lower extrusion roller 8. The front and rear sides of the conveying platform 7-3 are welded and fixed to the front and rear inner walls of the operating box 1, respectively. The support platform 7-4 is disposed inside the conveyor belt 7-1, and the upper surface of the support platform 7-4 is configured to abut against the inner belt surface on the upper side of the conveyor belt 7-1. The support platform 7-4 has several conical drainage holes 7-4-1 arranged in a matrix on it. Example 4:

[0027] See Figure 2 , Figure 6-7 As shown, based on Embodiment 1, the adjustment mechanism 9 includes: Sliding blocks 9-1, there are two sliding blocks 9-1, and they are respectively screwed onto the rotating shafts on the front and rear sides of the upper extrusion roller 8 via bearings. The sliding blocks 9-1 are slidably arranged in the sliding grooves on the front and rear inner walls of the operation box 1. Adjusting blocks 9-2, there are two adjusting blocks 9-2, which are symmetrically fixed on the two side walls of the front sliding block 9-1. The adjusting blocks 9-2 are slidably set in the adjusting groove on the inner wall of the sliding groove. Each adjusting block 9-2 is threadedly connected to an adjusting screw 9-3. The adjusting screw 9-3 is screwed to the adjusting groove through a bearing. The two adjusting screws 9-3 are connected to each other through a synchronous pulley transmission assembly. The adjusting rod 9-4 is screwed onto the side wall of the operating box 1 via a bearing. The adjusting rod 9-4 is connected to the lower end of the adjusting screw 9-3 on the left side via a worm gear pair. A rotating disk 9-5 is sleeved on and welded to the outer end of the adjusting rod 9-4. Example 5:

[0028] See Figure 6 , Figure 8 As shown, based on Embodiment 1, the linkage mechanism 11 includes: The drive gear 11-1 is sleeved and welded to the rotating shaft at the rear end of the lower extrusion roller 8. A first connecting plate 11-2 is sleeved on the rear side of the drive gear 11-1 and screwed to the rear end of the extrusion roller rotating shaft through a bearing. A first linkage gear 11-3 is screwed to the other side of the first connecting plate 11-2 through a shaft. The first linkage gear 11-3 is meshed with the drive gear 11-1. The second linkage gear 11-4 meshes with the first linkage gear 11-3 on the side away from the driving gear 11-1. The first linkage gear 11-3 and the second linkage gear 11-4 are hinged together by the second connecting plate 11-5. Driven gear 11-6 is sleeved and welded to the rotating shaft at the rear end of the upper extrusion roller 8. Driven gear 11-6 meshes with the second linkage gear 11-4. A third connecting plate 11-7 is sleeved on the rear side of driven gear 11-6 and screwed to the rear end of the extrusion roller rotating shaft via bearings. The third connecting plate 11-7 is screwed to the shaft on the second linkage gear 11-4 via bearings.

[0029] When using this invention, the material enters the operating box 1 through the feed inlet 1-1. According to the desired degree of compression, the rotating disk 9-5 is rotated, causing the adjusting rod 9-4 to rotate. The adjusting rod 9-4, through a worm gear pair, drives the connected adjusting screw 9-3 to rotate. This adjusting screw 9-3 drives another adjusting screw 9-3 to rotate. The two adjusting screws 9-3 respectively drive the adjusting block 9-2 to move through threads. The adjusting block 9-2 drives the sliding block 9-1 to move, and the sliding block 9-1 drives the upper extrusion roller 8 to move up and down until the extrusion roller 8 moves to the appropriate position. The drive is then activated. The drive motor 10 drives the lower extrusion roller 8 to rotate through the synchronous gear transmission assembly. When the lower extrusion roller 8 rotates, it drives the drive gear 11-1 to rotate. The drive gear 11-1 drives the first linkage gear 11-3, which in turn drives the second linkage gear 11-4, and finally transmits the power to the driven gear 11-6. Through the cooperation of the first linkage gear 11-3 and the second linkage gear 11-4, the drive gear 11-1 and the driven gear 11-6 rotate in opposite directions, thereby driving the two extrusion rollers 8 to rotate in opposite directions to achieve material extrusion. When the extrusion roller 8 rotates, it drives the pressure roller 6-2 to rotate via the synchronous pulley transmission assembly. The material entering the operating box 1 falls onto the filter support plate 6-1. As the pressure roller 6-2 rotates, it extrudes and conveys the material, causing the moisture in the material to drip through the filter support plate 6-1 and fall to the lower side inside the operating box 1. The material, guided by the guide plate 6-3, falls onto the conveyor mechanism 7. Simultaneously, the extrusion roller 8 rotates, driving the connected transmission wheel 7-2 to rotate via the synchronous pulley transmission assembly. The cooperation of the two transmission wheels 7-2 causes the conveyor belt 7-1 to rotate. The conveyor belt 7-1... When rotating, the material is moved between the two extrusion rollers 8. The moisture in the material can drip down into the lower side of the operating box 1 through the drainage hole 7-4-1 on the support platform 7-4 and the conveyor belt 7-1. The baffle 6-4 can prevent the material from falling directly from the conveyor mechanism 7 into the lower side of the operating box 1. After extrusion, the raw material falls onto the conveyor mechanism 7 and is conveyed by the conveyor mechanism 7, so that the raw material moves between the upper and lower extrusion rollers 8, so that the two extrusion rollers 8 extrude the material. Finally, it is discharged through the discharge pipe 3, and the extruded liquid is discharged through the liquid discharge pipe 4. When the position of the upper extrusion roller 8 needs to be adjusted, the movement of the upper extrusion roller 8 will cause one end of the third connecting plate 11-7 to move accordingly, which in turn causes the other end of the third connecting plate 11-7 to push the second linkage gear 11-4 to rotate around the axis of the upper roller. At the same time, with the length of the second connecting plate 11-5 fixed, the first linkage gear 11-3 will also rotate accordingly. Since the first linkage gear 11-3 is connected to the lower extrusion roller 8 through the first connecting plate 11-2 of fixed length, the first linkage gear 11-3 will rotate around the axis of the lower extrusion roller 8. This linkage design ensures that the driving gear 11-1, the first linkage gear 11-3, the second linkage gear 11-4 and the driven gear 11-6 always remain in mesh, and the rotation transmission and extrusion function of the two rollers will not be affected when the position of the upper roller is adjusted.

[0030] Compared with the prior art, the beneficial effects of this specific embodiment are as follows: 1. The two-stage design, consisting of preliminary pressure roller 6-2 for pre-pressing and upper and lower main extrusion rollers 8 for fine pressing, significantly improves material dewatering efficiency and final dryness. Preliminary extrusion quickly removes a large amount of free water, while the main extrusion rollers 8 complete deep pressing, forming a complete continuous dewatering process chain; 2. The height of the upper extrusion roller 8 can be precisely adjusted by adjusting the lead screw 9-3, thereby changing the extrusion gap and pressure. The unique linkage gear mechanism can adapt to this gap change, always maintaining stable meshing and reverse rotation transmission of the main and driven gears, ensuring that the equipment continues to operate normally during pressure adjustment; 3. The material undergoes multi-stage solid-liquid separation on the filter support plate 6-1, the support platform 7-4 with drainage holes 7-4-1, and the conveyor belt 7-1. The synchronously driven wiping roller 13 automatically cleans the conveyor belt 7-1 to prevent mesh blockage, ensure unobstructed water seepage channels, and maintain efficient and continuous dehydration capacity. 4. From feeding, pre-pressing, conveying, main pressing to dry and wet separation and discharge, all processes are completed in a single machine by the same drive motor 10 through synchronous gear train linkage, realizing fully automated continuous operation, compact structure, low energy consumption and high production efficiency.

[0031] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A double-roller extrusion thickening device for high-efficiency dewatering of chemimechanical pulp, characterized in that, It includes an operating box (1), support feet (2), and a discharge pipe (3). Support feet (2) are fixed to the four corners of the outer bottom wall of the operating box (1). An inlet (1-1) is provided on one side of the top wall of the operating box (1). A liquid outlet pipe (4) and a discharge pipe (3) are respectively provided on both sides of the bottom wall of the operating box (1). A partition (5) is provided between the liquid outlet pipe (4) and the discharge pipe (3). It also includes: The preliminary extrusion mechanism (6) is located on the side of the operation box (1) below the feed inlet (1-1). A conveying mechanism (7) is provided below the side of the preliminary extrusion mechanism (6). The conveying mechanism (7) is connected to the side wall of the operation box (1). The extrusion roller (8) consists of two rollers, which are symmetrically arranged inside the operating box (1) on the side away from the initial extrusion mechanism (6). The lower extrusion roller (8) abuts against the upper side of the partition (5). The rotating shafts on the front and rear sides of the lower extrusion roller (8) are screwed onto the side wall of the operating box (1) through bearings. The rotating shaft on the rear side of the extrusion roller (8) is exposed on the outer side of the rear side wall of the operating box (1). The upper extrusion roller (8) is connected to the side wall of the operating box (1) through the adjustment mechanism (9). The drive motor (10) is fixed on the outer bottom wall of the operation box (1) by a bracket, and the output shaft of the drive motor (10) is connected to the lower extrusion roller (8) through a synchronous wheel transmission assembly. Linkage mechanism (11) is located on the rear side wall of the operation box (1) and is connected to the rotating shaft on the rear side of the two extrusion rollers (8).

2. The double-roller extrusion thickening equipment for high-efficiency dewatering of chemimechanical pulp according to claim 1, characterized in that: The partition (5) has guide plates (12) fixed on both sides. The other side of the guide plate (12) is tilted downward and fixed on the inner bottom wall of the operation box (1). The side of the guide plate (12) that is tilted downward is located above the liquid outlet pipe (4) and the material outlet pipe (3).

3. The double-roller extrusion thickening equipment for high-efficiency dewatering of chemimechanical pulp according to claim 1, characterized in that: The preliminary extrusion mechanism (6) includes: The filter support plate (6-1) is located on the lower side of the feed inlet (1-1). The front and rear sides of the filter support plate (6-1) are fixed on the front and rear inner walls of the operation box (1). The center of the filter support plate (6-1) is arc-shaped. Both sides of the filter support plate (6-1) are inclined upwards. After the filter support plate (6-1) is inclined upwards on the side away from the extrusion roller (8), it is fixed on the inner top wall of the operation box (1). The pressure roller (6-2) is set inside the arc-shaped edge of the filter support plate (6-1). The front and rear ends of the pressure roller (6-2) are respectively screwed into the front and rear side walls of the operation box (1) through bearings. One end of the pressure roller (6-2) is connected to the rotating shaft on the lower extrusion roller (8) through the synchronous wheel transmission assembly. The guide plate (6-3) is fixed on the inclined side of the filter support plate (6-1). After the other side of the guide plate (6-3) is inclined downward, it is suspended on the upper side of the conveying mechanism (7). A baffle (6-4) is fixed on the lower side wall of the guide plate (6-3). The baffle (6-4) is set to cooperate with the conveying mechanism (7) to abut against each other.

4. The double-roller extrusion thickening equipment for high-efficiency dewatering of chemimechanical pulp according to claim 3, characterized in that: The conveying mechanism (7) includes: The conveyor belt (7-1) is located on the lower side of the guide plate (6-3). One side of the outer surface of the conveyor belt (7-1) is in contact with the baffle (6-4). The conveyor belt (7-1) is symmetrically arranged with drive wheels (7-2) inside. The front and rear ends of the drive wheels (7-2) are respectively screwed to the front and rear inner walls of the operating box (1) through bearings. One end of one drive wheel (7-2) is connected to the rotating shaft of one end of the extrusion roller (8) on the lower side through a synchronous wheel transmission assembly. The conveying platform (7-3) is positioned between the other side of the outer surface of the conveying mesh belt (7-1) and the lower extrusion roller (8). The front and rear sides of the conveying platform (7-3) are respectively fixed on the front and rear inner walls of the operation box (1). The support platform (7-4) is located inside the conveyor belt (7-1), and the upper surface of the support platform (7-4) is in contact with the inner belt surface on the upper side of the conveyor belt (7-1). The support platform (7-4) has several conical drainage holes (7-4-1) arranged in a matrix on it.

5. The double-roller extrusion thickening equipment for high-efficiency dewatering of chemimechanical pulp according to claim 4, characterized in that: The outer surface of the conveyor belt (7-1) is in contact with a wiping roller (13). The front and rear ends of the wiping roller (13) are respectively screwed onto the front and rear inner walls of the operation box (1) through bearings. One end of the wiping roller (13) is connected to one of the transmission wheels (7-2) through a synchronous wheel transmission assembly.

6. The double-roller extrusion thickening equipment for high-efficiency dewatering of chemimechanical pulp according to claim 1, characterized in that: The adjustment mechanism (9) includes: Sliding blocks (9-1), there are two sliding blocks (9-1), and they are respectively screwed onto the rotating shafts on the front and rear sides of the upper extrusion roller (8) through bearings. The sliding blocks (9-1) are slidably arranged in the sliding grooves on the front and rear inner walls of the operation box (1). Adjusting blocks (9-2), there are two adjusting blocks (9-2), and they are symmetrically fixed on the two side walls of one of the sliding blocks (9-1). The adjusting blocks (9-2) are slidably set in the adjusting groove on the inner wall of the sliding groove. Each adjusting block (9-2) is threaded with an adjusting screw (9-3). The adjusting screw (9-3) is screwed to the adjusting groove through a bearing. The two adjusting screws (9-3) are connected to each other through a synchronous pulley transmission assembly. Adjusting rod (9-4) is screwed onto the side wall of the operating box (1) via a bearing. The adjusting rod (9-4) is connected to the lower end of one of the adjusting screws (9-3) via a worm gear pair. A rotating disk (9-5) is sleeved and fixed on the outer end of the adjusting rod (9-4).

7. The double-roller extrusion thickening equipment for high-efficiency dewatering of chemimechanical pulp according to claim 1, characterized in that: A graphite waterproof pad (14) is fixed on the rear end wall of the upper extrusion roller (8), and the graphite waterproof pad (14) is located on the outside of the groove on the inner wall of the operating box (1).

8. The double-roller extrusion thickening equipment for high-efficiency dewatering of chemimechanical pulp according to claim 1, characterized in that: The linkage mechanism (11) includes: The drive gear (11-1) is sleeved and fixed on the rotating shaft at the rear end of the lower extrusion roller (8). A first connecting plate (11-2) is sleeved on the rear side of the drive gear (11-1) and screwed onto the rear end of the rotating shaft of the extrusion roller through a bearing. A first linkage gear (11-3) is screwed onto the other side of the first connecting plate (11-2) through a shaft. The first linkage gear (11-3) meshes with the drive gear (11-1). The second linkage gear (11-4) meshes with the first linkage gear (11-3) on the side away from the driving gear (11-1). The first linkage gear (11-3) and the second linkage gear (11-4) are hinged together by the second connecting plate (11-5). Driven gear (11-6) is sleeved and fixed on the rotating shaft at the rear end of the upper extrusion roller (8). Driven gear (11-6) meshes with the second linkage gear (11-4). A third connecting plate (11-7) is sleeved on the rear side of driven gear (11-6) and screwed onto the rear end of the extrusion roller rotating shaft through a bearing. The third connecting plate (11-7) is screwed onto the shaft on the second linkage gear (11-4) through a bearing.

9. The double-roller extrusion thickening device for high-efficiency dewatering of chemimechanical pulp according to claim 1, characterized in that: The outer side of the linkage mechanism (11) is covered with a protective cover (15). The protective cover (15) is fixed on the outer wall of the rear side of the operation box (1). The rotating shaft of the lower extrusion roller (8) is screwed onto the rear wall of the protective cover (15) through a bearing. The rotating shaft of the rear end of the upper extrusion roller (8) is inserted into the strip groove on the inner wall of the rear side of the protective cover (15).

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