Pulping process for papermaking pulp

Abstract

The invention relates to the technical field of papermaking, in particular to a pulping process for papermaking pulp. Comprising the following steps that wood chips are washed by a washer after being subjected to low-pressure steam treatment, the washed wood chips are dewatered, the dewatered wood chips enter a steeper to be treated after being torn by a tearing machine, and materials discharged from the steeper are subjected to pulping through a pulping device. The number of the rotating millstones needing to be driven can be automatically judged according to the slurry liquid level and the rotating direction of the motor output shaft. When the slurry flow is low, only the rotating millstone below the liquid level is driven to work, and the rotating millstone above the liquid level stops rotating, so that the energy consumption of the motor is obviously reduced, and the problem of energy waste caused by idling of the upper-layer millstone when the flow of the traditional multi-gap pulping device is low is solved.

Description

Technical Field

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

[0002] Papermaking processes are divided into two forms: organic and manual. The organic process is carried out continuously on a paper machine. Pulp suitable for the quality of the paper is diluted with water to a certain concentration, initially dewatered at the wire section of the paper machine to form a wet paper sheet, then dewatered by pressing, and finally dried into paper. Pulp stock is the primary product in the papermaking industry. During the production process of pulp stock, in order to make the pulp have better flexibility, a refiner is generally used to grind the pulp.

[0003] The patent document with publication number CN114561824B discloses a pulping device for papermaking. The provided feeding component can drive the sliding sealing plate to reciprocate through the second connecting rod during use, thereby realizing the repeated opening and closing of the feeding port, and achieving intermittent feeding at the feeding port during use, effectively avoiding the situation where a large amount of pulp accumulates on the grinding disc due to continuous feeding. By setting the electric cylinder and the sliding block, the distance between the upper grinding disc and the lower grinding disc can be adjusted during use, enabling corresponding adjustment of the grinding fineness according to needs. When the upper grinding disc is adjusted, the adjusting plate will move accordingly. When the gap between the upper grinding disc and the lower grinding disc is smaller, the opening amplitude of the discharge port at the lower end of the feeding port is smaller, and vice versa, enabling automatic matching of the pulp discharge amount according to the gap size between the upper grinding disc and the lower grinding disc, avoiding the situation of mismatch between the grinding amount and the discharge amount. This device has only one grinding gap. If this grinding gap becomes smaller, there will be problems such as a decrease in the overall discharge rate of the pulp and the pulp overflowing from the upper end of the grinding disc.

[0004] However, when multiple grinding gaps are set, if the flow rate of the pulp becomes smaller, the pulp cannot flow through the upper grinding gap, resulting in the situation where the upper grinding disc rotates idly. When the flow rate of the pulp becomes smaller, it is not possible to effectively select the appropriate number of grinding discs to work to achieve the purpose of reducing energy consumption. Summary of the Invention

[0005] The main object of the present invention is to provide a pulping process for papermaking pulp that can select the appropriate number of rotating grinding discs to rotate according to the feeding speed of the papermaking pulp, can avoid the ineffective idling of the rotating grinding discs, and is energy-saving and efficient.

[0006] To achieve the above object, the technical solution provided by the present invention is: A pulping process for papermaking pulp. After being treated with low-pressure steam, the wood chips are washed by a washer, and the washed wood chips are dehydrated. The dehydrated wood chips are torn by a shredder and then enter an impregnator for treatment. The material discharged from the impregnator is ground by a grinding device. The grinding device includes a housing, and a grinding assembly is arranged inside the housing. The grinding assembly includes a plurality of fixed grinding disks and a plurality of rotating grinding disks that are alternately stacked. A grinding gap is formed between adjacent fixed grinding disks and rotating grinding disks. The uppermost fixed grinding disk is fixedly connected to the housing. An outer ring is rotatably sleeved outside the rotating grinding disk. The outer ring and other fixed grinding disks can slide in the vertical direction of the housing. The lowermost rotating grinding disk is connected to a driving assembly. The driving assembly can drive the lowermost rotating grinding disk to rotate or lift. The fixed grinding disk and the outer ring are connected by a scissor assembly. When the lowermost rotating grinding disk lifts or lowers, the scissor assembly can make the plurality of grinding gaps change equidistantly. The inner hole of the lowermost rotating grinding disk is blocked. A connecting assembly is rotatably arranged in the inner holes of other fixed grinding disks except the uppermost fixed grinding disk. The connecting assembly includes a rotating sleeve. The upper end of the rotating sleeve extends into the rotating grinding disk. A square hole is opened in the rotating sleeve. The upper end of the rotating sleeve is fixedly and concentrically communicated with an upper pipe. The upper pipe is slidably inserted into the square hole of the rotating sleeve above it. A lower pipe is fixed on the lowermost rotating grinding disk. A through hole is opened at the lower end of the lower pipe. The lower pipe is slidably inserted into the square hole of the rotating sleeve above it. A plurality of fixed blocks are fixed in the rotating grinding disk outside the rotating sleeve. A selection driving unit is arranged on the rotating sleeve. The selection driving unit can select the number of rotating grinding disks to be driven to rotate according to the rotation direction of the rotating sleeve and the liquid level of the papermaking pulp in the grinding assembly through cooperation with the fixed blocks.

[0007] Specifically, the uppermost fixed grinding disk is fixedly connected to the housing through a plurality of fixed columns.

[0008] Specifically, two ear plates are symmetrically fixed on the outside of other fixed grinding disks except the uppermost fixed grinding disk, and two ear plates are symmetrically fixed on the outside of the outer ring. The ear plates on the fixed grinding disk and the ear plates on the outer ring are vertically corresponding. A vertical sliding rod penetrates through the ear plates, and the ear plates are slidably connected to the sliding rod. The sliding rod is fixed inside the housing.

[0009] Specifically, the driving assembly includes a cylinder fixed inside the lower end of the housing. The cylinder is vertically arranged, and a motor is fixed at the upper end of the cylinder. The output shaft of the motor is fixedly and concentrically connected to the lowermost rotating grinding disk.

[0010] Specifically, the scissor assembly includes a plurality of scissor units. Each scissor unit includes two connecting rods. The middle parts of the two connecting rods are rotatably connected by a fixed shaft. The connecting rods of adjacent two scissor units are rotatably connected. Two end rods are rotatably connected to the upper and lower ends of each scissor unit respectively. The two upper end rods are rotatably connected by a fixed shaft, and the two lower end rods are rotatably connected by a fixed shaft. The plurality of fixed shafts respectively correspond to the plurality of fixed grinding disks and the plurality of outer rings. The fixed grinding disk is fixedly connected to its corresponding fixed shaft, and the outer ring is fixedly connected to its corresponding fixed shaft.

[0011] Specifically, the upper end of the shell is fixedly connected to a feed pipe, the feed pipe corresponds to the inner hole of the fixed grinding disc, the lower end of the shell is fixedly connected to a discharge pipe, the uppermost upper pipe extends into the feed pipe, a slip ring is fixed to the upper end of the upper pipe in the feed pipe, and the outer edge of the slip ring is in movably sealing contact with the inner edge of the feed pipe.

[0012] Specifically, the selection drive unit includes a rotating cylinder rotatably connected to the rotating sleeve, a collar is fixed at the lower end of the rotating cylinder, and a ring is rotatably connected to the lower end of the collar, the ring is fixedly connected to the fixed grinding disc on the outer side thereof through multiple fixing rods, and multiple blades are fixed on the outer side of the collar, and an arc-shaped slider is concentrically fixed to the upper end of the rotating cylinder, an arc groove is provided on the rotating sleeve, and the slider is slidably arranged in the arc groove, and a first slider and a second slider are slidably arranged in the arc groove on both sides of the slider, respectively, the first slider is connected to the groove wall of the arc groove through a first arc spring, and the second slider is connected to the groove wall of the arc groove through a second arc spring, the stiffness coefficient of the first arc spring is smaller than the stiffness coefficient of the second arc spring, side grooves are provided on both sides of the rotating sleeve, and a toggle plate is elastically slidably connected in the side groove, and a second magnet is fixed to the toggle plate facing one end of the rotating cylinder, and a first magnet is inlaid and fixed on the outer edge of the rotating cylinder, and the second magnet is attracted to the first magnet. After the first magnet and the second magnet are misaligned, the toggle plate can move toward the outer side of the rotating sleeve and drive the rotating grinding disc to rotate through the fixed block.

[0013] Specifically, an arc-shaped limiting slide groove is provided on the arc-shaped groove wall of the arc-shaped groove, and protrusions are fixed on the first slide plate and the second slide plate, and the protrusions are slidably set in the limiting slide groove. A long groove is provided on the groove wall of the side groove, and an inner block is slidably set in the long groove. The inner block is fixedly connected to the toggle plate, and the inner block is connected to the groove wall of the long groove through an inner spring.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By selecting the intelligent sensing mechanism of the drive unit (blade resistance, the attraction of the first magnet and the second magnet, and the synergistic effect of the first arc spring and the second arc spring), the number of rotating grinding discs to be driven can be automatically determined according to the slurry level and the rotation direction of the motor output shaft. When the slurry flow is low, only the rotating grinding discs below the liquid surface are driven to work, and the rotating grinding discs above the liquid surface stop rotating, which significantly reduces the energy consumption of the motor and solves the energy waste problem of the upper grinding disc idling at low flow in traditional multi-gap refining devices.

[0015] 2. The linkage design of the scissor assembly and the drive assembly enables the lifting and lowering of the bottom rotating grinding disc to synchronously adjust the spacing of all grinding gaps to ensure uniform changes in each gap. This simplifies the gap adjustment operation and avoids the uneven gap problem caused by traditional layer-by-layer adjustment, thereby improving grinding consistency and efficiency.

[0016] 3. The fixed grinding disc and the outer ring are vertically slidably matched through the ear plates and sliding rods to ensure the stability of the multi-layer grinding disc during the lifting process and avoid skew jamming.

[0017] 4. The combination of the upper pipe and the slip ring realizes the dynamic sealing of the feed pipe to prevent the leakage of the slurry; the through-hole design of the lower pipe ensures smooth discharge and reduces the risk of blockage.

[0018] 5. Through the forward and reverse rotation control of the motor, two working modes can be switched: when in the high-flow mode, the output shaft of the motor rotates clockwise: all the rotating grinding discs are started to meet the high-load grinding requirements; when in the low-flow mode, the output shaft of the motor rotates counterclockwise: only the rotating grinding discs below the pulp level of the papermaking slurry work, combined with the strong resistance characteristics of the second arc spring, accurately judge the filling state of the papermaking slurry in the inner holes of the fixed grinding disc and the rotating grinding disc, and achieve energy-saving operation. Brief Description of the Drawings

[0019] Figure 1 It is a cross-sectional view of the present invention.

[0020] Figure 2 It is a schematic diagram of the pulp grinding assembly.

[0021] Figure 3 It is a schematic diagram of the rotating grinding disc.

[0022] Figure 4 It is a schematic diagram of the fixed grinding disc.

[0023] Figure 5 It is a cross-sectional view of the pulp grinding assembly.

[0024] Figure 6 It is a cross-sectional view of the rotating sleeve.

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of the rotating sleeve.

[0026] Figure 8 It is a schematic diagram of the dialing plate in the rotating sleeve.

[0027] Figure 9 It is a schematic diagram of the cooperation between the slider and the arc groove.

[0028] Figure 10 It is a schematic diagram of the cooperation between the first sliding plate, the second sliding plate and the slider.

[0029] Figure 11 It is a position relationship diagram of the dialing plate and the rotating grinding disc.

[0030] The component names in the attached drawings are as follows: 1. Housing; 2. Feed pipe; 3. Discharge pipe; 4. Fixed grinding disc; 5. Rotating grinding disc; 6. Outer ring; 7. Ear plate; 8. Slide bar; 9. Fixed shaft; 10. Connecting rod; 100. End rod; 11. Fixed column; 12. Motor; 13. Cylinder; 14. Fixed block; 15. Fixed rod; 16. Ring-shaped part; 17. Rotating sleeve; 18. Upper pipe; 19. Slip ring; 20. Lower pipe; 21. Through hole; 22. Rotating cylinder; 23. Collar; 24. Blade; 25. First magnet; 26. Poking plate; 27. Second magnet; 28. Long groove; 29. Inner block; 30. Inner spring; 31. Arc groove; 32. Slide block; 33. Limit chute; 34. First slide plate; 35. First arc spring; 36. Second slide plate; 37. Second arc spring. Detailed implementation manners

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

[0032] Refer to Figures 1 - 11 As shown, in a papermaking pulp grinding process, wood chips are washed by a washer after being treated with low-pressure steam, the washed wood chips are dehydrated, the dehydrated wood chips are torn by a shredder and then enter an impregnator for treatment, and the material discharged from the impregnator is ground by a grinding device.

[0033] The grinding device includes a housing 1, and a grinding assembly is arranged inside the housing 1.

[0034] The grinding assembly includes a plurality of fixed grinding discs 4 and a plurality of rotating grinding discs 5 that are arranged in an interleaved and stacked manner. In this embodiment, the uppermost of the grinding assembly is the fixed grinding disc 4, and the lowermost is the rotating grinding disc 5.

[0035] A grinding gap is formed between adjacent fixed grinding discs 4 and rotating grinding discs 5. The uppermost fixed grinding disc 4 is fixedly connected to the housing 1 through a plurality of fixed columns 11.

[0036] An outer ring 6 is rotatably sleeved outside the rotating grinding disc 5, and the outer ring 6 and other fixed grinding discs 4 can slide in the vertical direction of the housing 1. Specifically, except for the uppermost fixed grinding disc 4, two ear plates 7 are symmetrically fixed on the outside of other fixed grinding discs 4, two ear plates 7 are symmetrically fixed on the outside of the outer ring 6, the ear plates 7 on the fixed grinding disc 4 and the ear plates 7 on the outer ring 6 are vertically corresponding, a vertical slide bar 8 penetrates through the ear plates 7, and the ear plates 7 are slidably connected to the slide bar 8, and the slide bar 8 is fixed inside the housing 1.

[0037] The lowermost rotating grinding disc 5 is connected to a driving assembly, and the driving assembly can drive the lowermost rotating grinding disc 5 to rotate or lift.

[0038] The driving assembly includes a cylinder 13 fixed inside the lower end of the housing 1. The cylinder 13 is vertically arranged, and a motor 12 is fixed at the upper end of the cylinder 13. The output shaft of the motor 12 is fixedly connected concentrically with the lowermost rotating grinding disc 5. After the motor 12 is started, the lowermost rotating grinding disc 5 can rotate. After the cylinder 13 is started, the lowermost rotating grinding disc 5 can move up and down.

[0039] The fixed grinding disc 4 and the outer ring 6 are connected by a scissor assembly. When the lowermost rotating grinding disc 5 moves up and down, the scissor assembly can make multiple grinding gaps change equidistantly.

[0040] The scissor assembly includes multiple scissor units. Each scissor unit includes two connecting rods 10. The middle parts of the two connecting rods 10 are rotatably connected by a fixed shaft 9. The connecting rods 10 of adjacent scissor units are rotatably connected. Two end rods 100 are rotatably connected to the upper and lower scissor units respectively. The two upper end rods 100 are rotatably connected by a fixed shaft 9, and the two lower end rods 100 are rotatably connected by a fixed shaft 9. The multiple fixed shafts 9 correspond to multiple fixed grinding discs 4 and multiple outer rings 6 respectively. The fixed grinding disc 4 is fixedly connected to its corresponding fixed shaft 9, and the outer ring 6 is fixedly connected to its corresponding fixed shaft 9.

[0041] When the lowermost rotating grinding disc 5 moves up and down, the positions of other fixed grinding discs 4 and rotating grinding discs 5 except the uppermost fixed grinding disc 4 change, and multiple grinding gaps change equidistantly.

[0042] The inner hole of the lowermost rotating grinding disc 5 is blocked, and connecting components are rotatably arranged in the inner holes of other fixed grinding discs 4 except the uppermost fixed grinding disc 4.

[0043] The connecting component includes a rotating sleeve 17. The upper end of the rotating sleeve 17 extends into the rotating grinding disc 5. A square hole is formed in the rotating sleeve 17. The upper end of the rotating sleeve 17 is fixedly and communicatively connected with an upper pipe 18. The upper pipe 18 is slidably inserted into the square hole of the rotating sleeve 17 above it.

[0044] The upper end of the housing 1 is fixedly and communicatively connected with a feed pipe 2. The feed pipe 2 corresponds to the inner hole of the fixed grinding disc 4. The lower end of the housing 1 is fixedly and communicatively connected with a discharge pipe 3. The upper pipe 18 at the uppermost end extends into the feed pipe 2. A sliding ring 19 is fixed at the upper end of the upper pipe 18 in the feed pipe 2. The outer edge of the sliding ring 19 is in movable sealing contact with the inner edge of the feed pipe 2.

[0045] A lower pipe 20 is fixed on the lowermost rotating grinding disc 5. A through hole 21 is formed at the lower end of the lower pipe 20. The lower pipe 20 is slidably inserted into the square hole of the rotating sleeve 17 above it.

[0046] When the motor 12 drives the lowermost rotating grinding disc 5 to rotate, the lower pipe 20 can drive multiple connecting components to rotate simultaneously. When the lowermost rotating grinding disc 5 moves up and down, the upper pipe 18 can move in the square hole of the rotating sleeve 17.

[0047] A plurality of fixed blocks 14 are fixed inside the rotating grinding disc 5 outside the rotating sleeve 17. A selection drive unit is provided on the rotating sleeve 17, and the selection drive unit can select the number of rotating grinding discs 5 to be driven to rotate by cooperating with the fixed blocks 14 according to the rotation direction of the rotating sleeve 17 and the liquid level of the papermaking pulp in the pulping assembly.

[0048] The selective driving unit includes a rotating cylinder 22 rotatably connected to the rotating sleeve 17 , a sleeve ring 23 is fixed to the lower end of the rotating cylinder 22 , and a ring member 16 is rotatably connected to the lower end of the sleeve ring 23 . The ring member 16 is fixedly connected to the fixed grinding disc 4 on its outer side through a plurality of fixing rods 15 .

[0049] A plurality of blades 24 are fixed to the outside of the collar 23 .

[0050] An arc-shaped slider 32 is coaxially fixed to the upper end of the rotating cylinder 22 , and an arc-shaped groove 31 is formed on the rotating sleeve 17 , and the slider 32 is slidably arranged in the arc-shaped groove 31 .

[0051] A first slide plate 34 and a second slide plate 36 are slidably disposed in the arc groove 31 on both sides of the slider 32. The first slide plate 34 is connected to the groove wall of the arc groove 31 through a first arc spring 35. The second slide plate 36 is connected to the groove wall of the arc groove 31 through a second arc spring 37. The stiffness coefficient of the first arc spring 35 is smaller than the stiffness coefficient of the second arc spring 37.

[0052] An arc-shaped limiting sliding groove 33 is provided on the arc-shaped groove wall of the arc-shaped groove 31. A protrusion is fixed on each of the first slide plate 34 and the second slide plate 36. The protrusion is slidably arranged in the limiting sliding groove 33. Side grooves are provided on both sides of the rotating sleeve 17, and a toggle plate 26 is elastically slidably connected in the side grooves. A second magnet 27 is fixed to the end of the toggle plate 26 facing the rotating cylinder 22. A first magnet 25 is embedded and fixed on the outer edge of the rotating cylinder 22. The second magnet 27 is attracted to the first magnet 25. After the first magnet 25 and the second magnet 27 are misaligned, the toggle plate 26 can move toward the outside of the rotating sleeve 17 and drive the rotating grinding disc 5 to rotate through the fixed block 14.

[0053] A long groove 28 is opened on the groove wall of the side groove, and an inner block 29 is slidably arranged in the long groove 28. The inner block 29 is fixedly connected to the toggle plate 26, and the inner block 29 is connected to the groove wall of the long groove 28 through an inner spring 30.

[0054] When the papermaking pulp is refined: the cylinder 13 is started, and the cylinder 13 drives the lowermost rotating grinding disc 5 to rise and fall, and the size of the refining gap is adjusted according to the particle size requirement of the papermaking pulp.

[0055] The motor 12 is started, and the motor 12 drives the rotating grinding disc 5 at the lower end to rotate clockwise. When the rotating grinding disc 5 at the lower end rotates, the lower tube 20 drives the multiple connecting components to rotate.

[0056] When the connecting assembly rotates, the blade 24 rotates accordingly. The blade 24 is subjected to air resistance, so that the rotating cylinder 22 and the collar 23 generate a speed difference with the rotating sleeve 17. The rotating cylinder 22 and the collar 23 rotate counterclockwise relative to the rotating sleeve 17. The first arc spring 35 is compressed. After the first magnet 25 and the second magnet 27 are misaligned, the toggle plate 26 moves toward the outside of the rotating sleeve 17 under the elastic force of the inner spring 30. After the toggle plate 26 moves toward the outside of the rotating sleeve 17, the toggle plate 26 can be blocked by the fixed block 14. When the connecting assembly rotates, the toggle plate 26 rotates the rotating grinding disc 5 through the fixed block 14. At this time, all the rotating grinding discs 5 rotate.

[0057] The papermaking pulp entering the feed pipe 2 passes through multiple upper pipes 18 and multiple square holes in the rotating sleeves 17 and then enters the lower pipe 20. The papermaking pulp entering the lower pipe 20 is discharged through the through hole 21. The papermaking pulp discharged from the through hole 21 enters the inner holes of the fixed grinding disc 4 and the rotating grinding disc 5, and then enters the refining gap. Under the rotation of the rotating grinding disc 5, the papermaking pulp is ground in the refining gap.

[0058] When the papermaking slurry flow rate in the feed pipe 2 is low, the papermaking slurry liquid level in the inner holes of the fixed grinding disc 4 and the rotating grinding disc 5 decreases. At this time, the rotating grinding disc 5 above the papermaking slurry liquid level in the inner holes of the fixed grinding disc 4 and the rotating grinding disc 5 rotates idly. In order to avoid the rotating grinding disc 5 from rotating idly when the papermaking slurry flow rate in the feed pipe 2 is low, the motor 12 can be turned off to drive the lowest rotating grinding disc 5 to rotate counterclockwise.

[0059] After the motor 12 is turned off, under the elastic force of the first arc spring 35, the first slide plate 34, the rotating cylinder 22 and the sleeve ring 23 are restored, the first magnet 25 and the second magnet 27 are attracted correspondingly, and the toggle plate 26 is reset.

[0060] When the motor 12 drives the bottommost rotating grinding disc 5 to rotate counterclockwise, the multiple connecting components rotate counterclockwise, and the blades 24 in contact with the papermaking slurry are subject to the resistance of the papermaking slurry, while the blades 24 above the papermaking slurry liquid surface are subject to the resistance of the air. Since the stiffness coefficient of the first arc spring 35 is smaller than the stiffness coefficient of the second arc spring 37, when the connecting component rotates counterclockwise, the resistance of the air on the blades 24 above the papermaking slurry liquid surface is smaller than the elastic force of the second arc spring 37, and the rotating cylinder 22 and the sleeve ring 23 above the papermaking slurry liquid surface will not move relative to the rotating sleeve 17 to generate a speed difference, that is, the toggle plate 26 above the papermaking slurry liquid surface cannot slide toward the outside of the rotating sleeve 17, and the rotating grinding disc 5 above the papermaking slurry liquid surface cannot rotate, which can prevent the rotating grinding disc 5 above the papermaking slurry liquid surface from idling.

[0061] The resistance on the blade 24 in the papermaking pulp is relatively large. When the motor 12 drives the lowermost rotating grinding disc 5 to rotate counterclockwise, there is a speed difference between the rotating cylinder 22 and the collar 23 in the papermaking pulp and the rotating sleeve 17. The rotating cylinder 22 and the collar 23 rotate clockwise relative to the rotating sleeve 17, and the second arc-shaped spring 37 is compressed. After the first magnet 25 and the second magnet 27 are misaligned, under the elastic force of the inner spring 30, the dialing plate 26 in the papermaking pulp moves towards the outside of the rotating sleeve 17. After the dialing plate 26 in the papermaking pulp moves towards the outside of the rotating sleeve 17, the dialing plate 26 in the papermaking pulp can be blocked by the corresponding fixed block 14. The dialing plate 26 causes the rotating grinding disc 5 below the liquid level of the papermaking pulp to rotate through the fixed block 14, realizing the rotation of the rotating grinding disc 5 below the liquid level of the papermaking pulp when the flow rate of the papermaking pulp is small. When the flow rate of the papermaking pulp is small, the energy consumption of the motor 12 can be reduced.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pulp refining process for papermaking, characterized in that, The wood chips are washed by a washer after being treated with low-pressure steam, the washed wood chips are dehydrated, the dehydrated wood chips are torn by a shredder and then enter an impregnator for treatment, and the material discharged from the impregnator is ground by a grinding device; the grinding device includes a housing (1), a grinding assembly is arranged in the housing (1), the grinding assembly includes a plurality of fixed grinding discs (4) and a plurality of rotating grinding discs (5) that are alternately stacked, a grinding gap is formed between adjacent fixed grinding discs (4) and rotating grinding discs (5), the uppermost fixed grinding disc (4) is fixedly connected to the housing (1), an outer ring (6) is rotatably sleeved outside the rotating grinding disc (5), and the outer ring (6) and other fixed grinding discs (4) can slide in the vertical direction of the housing (1), the lowermost rotating grinding disc (5) is connected to a driving assembly, and the driving assembly can drive the lowermost rotating grinding disc (5) to rotate or lift, the fixed grinding disc (4) and the outer ring (6) are connected by a scissor assembly, when the lowermost rotating grinding disc (5) lifts, the scissor assembly can make the plurality of grinding gaps change equidistantly, the inner hole of the lowermost rotating grinding disc (5) is blocked, and connecting assemblies are rotatably arranged in the inner holes of other fixed grinding discs (4) except the uppermost fixed grinding disc (4), the connecting assembly includes a rotating sleeve (17), the upper end of the rotating sleeve (17) extends into the rotating grinding disc (5), a square hole is opened in the rotating sleeve (17), an upper pipe (18) is fixedly and communicatively connected to the upper end of the rotating sleeve (17) concentrically, the upper pipe (18) is slidably inserted into the square hole of the rotating sleeve (17) above it, a lower pipe (20) is fixed on the lowermost rotating grinding disc (5), a through hole (21) is opened at the lower end of the lower pipe (20), the lower pipe (20) is slidably inserted into the square hole of the rotating sleeve (17) above it, a plurality of fixing blocks (14) are fixed in the rotating grinding disc (5) outside the rotating sleeve (17), and a selection driving unit is arranged on the rotating sleeve (17), and the selection driving unit can select the number of rotating grinding discs (5) to be driven to rotate according to the rotation direction of the rotating sleeve (17) and the liquid level of the papermaking pulp in the grinding assembly through cooperation with the fixing blocks (14).

2. The pulp refining process for papermaking pulp according to claim 1, wherein The uppermost fixed grinding disc (4) is fixedly connected to the housing (1) through a plurality of fixing columns (11).

3. The pulp refining process for papermaking pulp according to claim 1, wherein Two ear plates (7) are symmetrically fixed on the outside of other fixed grinding discs (4) except the uppermost fixed grinding disc (4), two ear plates (7) are symmetrically fixed on the outside of the outer ring (6), the ear plates (7) on the fixed grinding disc (4) and the ear plates (7) on the outer ring (6) are vertically corresponding, a vertical sliding rod (8) penetrates through the ear plates (7), and the ear plates (7) are slidably connected to the sliding rod (8), and the sliding rod (8) is fixed in the housing (1).

4. The pulp refining process for papermaking pulp according to claim 1, characterized in that, The driving assembly includes a cylinder (13) fixed inside the lower end of the housing (1), the cylinder (13) is vertically arranged, a motor (12) is fixed at the upper end of the cylinder (13), and the output shaft of the motor (12) is fixedly connected to the lowermost rotating grinding disc (5) concentrically.

5. The pulp refining process for papermaking stock according to claim 1, wherein, The scissor fork assembly comprises a plurality of scissor fork units, each of which comprises two connecting rods (10). The middle parts of the two connecting rods (10) are rotatably connected via a fixed shaft (9). The connecting rods (10) of two adjacent scissor fork units are rotatably connected. The scissor fork units at the upper and lower ends are both rotatably connected with two end rods (100). The upper two end rods (100) are rotatably connected via a fixed shaft (9), and the lower two end rods (100) are rotatably connected via a fixed shaft (9). The plurality of fixed shafts (9) respectively correspond to the plurality of fixed grinding discs (4) and the plurality of outer rings (6). The fixed grinding discs (4) are fixedly connected to the corresponding fixed shafts (9), and the outer rings (6) are fixedly connected to the corresponding fixed shafts (9).

6. The pulp refining process for papermaking pulp according to claim 1, wherein, The upper end of the shell (1) is fixedly connected to a feed pipe (2), the feed pipe (2) corresponds to the inner hole of the fixed grinding disc (4), the lower end of the shell (1) is fixedly connected to a discharge pipe (3), the uppermost upper pipe (18) extends into the feed pipe (2), the upper end of the upper pipe (18) in the feed pipe (2) is fixed with a slip ring (19), and the outer edge of the slip ring (19) is in movable sealing contact with the inner edge of the feed pipe (2).

7. The pulp refining process for papermaking pulp according to claim 1, characterized in that, The selective driving unit comprises a rotating cylinder (22) rotatably connected to a rotating sleeve (17), a collar (23) being fixed at the lower end of the rotating cylinder (22), a ring (16) being rotatably connected at the lower end of the collar (23), the ring (16) being fixedly connected to a fixed grinding disc (4) on the outer side thereof through a plurality of fixing rods (15), a plurality of blades (24) being fixed on the outer side of the collar (23), an arc-shaped slider (32) being concentrically fixed at the upper end of the rotating cylinder (22), an arc-shaped groove (31) being provided on the rotating sleeve (17), the slider (32) being slidably arranged in the arc-shaped groove (31), a first slider (34) and a second slider (36) being slidably arranged in the arc-shaped groove (31) on both sides of the slider (32), the first slider (34) and the groove wall of the arc-shaped groove (31) being connected by a first slider (34) and a second slider (36) being respectively connected by a first slider (36) and a second slider (36) being connected by a first slider (34) and a second slider (36) being ... The rotating sleeve (17) is connected with a first arc spring (35), the second slide plate (36) is connected with the groove wall of the arc groove (31) through a second arc spring (37), the spring coefficient of the first arc spring (35) is smaller than the spring coefficient of the second arc spring (37), side grooves are provided on both sides of the rotating sleeve (17), a toggle plate (26) is elastically slidably connected in the side grooves, a second magnet (27) is fixed to one end of the toggle plate (26) facing the rotating cylinder (22), the first magnet (25) is embedded and fixed on the outer edge of the rotating cylinder (22), the second magnet (27) is attracted to the first magnet (25), after the first magnet (25) and the second magnet (27) are misaligned, the toggle plate (26) can move toward the outer side of the rotating sleeve (17) and drive the rotating grinding disc (5) to rotate through the fixed block (14).

8. The pulp refining process for papermaking stock according to claim 7, wherein, An arc-shaped limiting sliding groove (33) is provided on the arc-shaped groove wall of the arc-shaped groove (31), and a convex block is fixed on both the first slide plate (34) and the second slide plate (36), and the convex block is slidably arranged in the limiting sliding groove (33). A long groove (28) is provided on the groove wall of the side groove, and an inner block (29) is slidably arranged in the long groove (28), and the inner block (29) is fixedly connected to the toggle plate (26), and the inner block (29) is connected to the groove wall of the long groove (28) through an inner spring (30).

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