Slurry coating device

Abstract

The utility model discloses a slurry coating device, and belongs to a device for coating fluid on a surface. Comprising a headbox. And an adjustable partition plate assembly is arranged in the weir pool of the headbox. The adjustable partition plate assembly comprises a partition plate and a screw rod, a nut sleeve is fixed on the partition plate, and the screw rod in threaded connection with the nut sleeve is arranged in the nut sleeve in a penetrating mode. The upper end of the screw rod penetrates through the outer part of the weir pool shell, and the screw rod is rotationally connected with the weir pool shell. The problems that when an existing headbox is used for producing high-gram-weight products, the amount of pulp is large, control is difficult, and stability is poor are solved, meanwhile, low-cost transformation of the existing headbox is achieved, the enterprise investment cost is reduced, and the production effect is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of equipment for coating fluid on a surface, and particularly relates to a pulp coating device. BACKGROUND

[0002] In the papermaking production process, the headbox as the key equipment of the paper machine, its core function is to uniformly and stably deliver the pulp, and to coat the pulp, laying the foundation for the subsequent paper forming. At present, with the increase of market demand for high grammage paper products, the existing headbox has obvious defects in the production of high grammage products.

[0003] High grammage paper product production needs to invest a large amount of pulp, and the existing headbox only relies on the throat roller (the first pulp uniformizing roller) and the gate roller (the second pulp uniformizing roller) to control the pulp uniformization, lacks the structure of shunting and stabilizing the large amount of pulp, resulting in poor flow stability of the pulp in the weir pool, and easy to have problems such as uneven distribution of pulp, flow velocity fluctuation. This unstable state directly affects the effect of pulp spraying on the wire, making the paper thickness uneven, the basis weight deviation large, and it is difficult to meet the production quality requirements of high grammage paper products.

[0004] If the above problems are to be solved, the traditional solution is to order a new headbox equipment suitable for high grammage production, but the new equipment not only has high investment cost, but also has uncertainty in the adaptability of the new equipment to the existing paper machine production line and the actual production effect, which brings great economic risk and production hidden danger to the enterprise, and cannot meet the needs of low-cost and high-efficiency transformation of the enterprise. CONTENT OF THE INVENTION

[0005] The technical problem solved by the present application is to overcome the shortcomings of the prior art, provide a pulp coating device, which solves the problems of large amount of pulp, difficult control and poor stability of the existing headbox in the production of high grammage products, and realizes low-cost transformation of the existing headbox, reduces the investment cost of the enterprise and ensures the production effect.

[0006] The technical scheme adopted by the present application to solve the existing problems is:

[0007] A pulp coating device, comprising a headbox. The inside of the weir pool of the headbox is provided with an adjustable baffle assembly.

[0008] The adjustable baffle assembly comprises a baffle and a screw rod, the baffle is fixed with a nut sleeve, and the screw rod is threadedly connected in the nut sleeve.

[0009] The upper end of the screw rod penetrates to the outside of the weir pool shell, and the screw rod is rotationally connected with the weir pool shell.

[0010] Preferably, the inner wall of the weir pool shell is concavely provided with a plurality of vertically and spacedly arranged limiting holes.

[0011] The top rod is arranged horizontally on the partition plate, and the adjustable partition plate assembly comprises a top rod control assembly which controls the top rod to enter or exit the limiting hole.

[0012] Preferably, the top rod passes through the through hole of the side wall of the partition plate and the first support sleeve fixed on the partition plate.

[0013] A spring seat is arranged on the top rod, and the spring seat is located between the side wall of the partition plate and the first support sleeve. A spring is arranged on the top rod, and the spring is located between the spring seat and the first support sleeve.

[0014] A sliding block is fixed to the rear end of the top rod, and the top rod control assembly controls the movement of the sliding block.

[0015] Preferably, the partition plate is connected with two symmetrically arranged top rods, and the top surface of the sliding block is concavely provided with an inclined sliding groove, and the end of the inclined sliding groove facing the spring is lower than the other end.

[0016] The top rod control assembly comprises a downwardly arranged U-shaped rod, and the two bottom ends of the U-shaped rod are respectively in abutment with the inclined sliding grooves of the sliding blocks connected with the two top rods.

[0017] A first polygonal rod is fixed above the U-shaped rod, a polygonal hole is arranged in the middle of the screw rod, and the first polygonal rod is arranged in the polygonal hole of the screw rod. The top end of the first polygonal rod is arranged above the outside of the screw rod.

[0018] Preferably, a hand wheel is fixed to the top of the first polygonal rod.

[0019] Preferably, a turning plate is rotatably connected to the bottom of the partition plate, and a turning plate driving assembly is arranged on the weir pool shell to control the rotation of the turning plate.

[0020] Preferably, the turning plate driving assembly comprises a connecting plate, a connecting frame, a rack and a gear.

[0021] The connecting plate is fixedly connected to the end of the turning plate away from the direction of the pulp flow, a waist-shaped hole is arranged on the connecting plate, the bottom frame of the connecting frame is slidably arranged in the waist-shaped hole, a vertically arranged rack is fixedly arranged above the connecting frame, the upper end of the rack passes through the through hole in the top of the weir pool shell, and the gear is rotatably arranged outside the weir pool shell and is in meshing connection with the rack.

[0022] A servo motor is fixed to the top of the weir pool shell, and the servo motor drives the gear to rotate.

[0023] Preferably, the rotating shaft of the gear passes through a second support sleeve fixed on the weir pool shell, and a second polygonal rod is slidably arranged in the rotating shaft.

[0024] The output end of the servo motor is provided with a connecting shaft, and a polygonal groove coaxially arranged is concavely arranged on the front end surface of the connecting shaft.

[0025] The second polygonal rod is provided with a telescopic control device at one end away from the servo motor, the telescopic rod end of the telescopic control device is rotationally connected with the second polygonal rod, and the telescopic control device drives the second polygonal rod to be inserted into or separated from the polygonal groove of the connecting shaft.

[0026] Compared with the prior art, the application has the beneficial effects that:

[0027] (1) The stability of the slurry is significantly improved: the additional partition plate separates the slurry in the weir pool into independent steady flow areas, effectively buffers the impact force when a large amount of slurry flows, avoids the fluctuation of the slurry flow rate, cooperates with the secondary uniform slurry of the throat roller and the gate roller, and makes the slurry always maintain a stable state before spraying, completely solves the problem that the slurry is difficult to control in the production of high-grammage products, greatly reduces the paper page quantitative deviation, and meets the production quality requirements.

[0028] (2) The transformation cost is low and the cost performance is high: the transformation scheme only needs to add an adjustable partition plate assembly on the basis of the existing headbox, without replacing new equipment, the material cost and labor cost required for transformation are much lower than the cost of ordering new equipment, the investment cost of the enterprise is reduced, and the uncertainty risk of the adaptability and effect of new equipment is avoided.

[0029] (3) Strong adaptability and flexible operation: the height of the partition plate is adjustable, and the throat roller and the gate roller are cooperatively adjusted, which not only meets the production requirements of high-grammage paper products, but also adjusts the parameters according to the production requirements of different-grammage paper products, adapts to the production of various paper products, improves the universality and practicality of the headbox, and is easy to operate without professional technical personnel. BRIEF DESCRIPTION OF DRAWINGS

[0030] The application will be further described below in combination with the drawings and examples.

[0031] Figure 1 FIG. 1 is a local structure diagram of a slurry coating device weir pool according to the application,

[0032] Figure 2 FIG. 2 is a sectional view of Figure 1

[0033] Figure 3 FIG. 3 is a structure diagram of an internal adjustable partition plate assembly of a slurry coating device according to the application,

[0034] Figure 4 FIG. 4 is a first sectional view of the adjustable partition plate assembly according to the application,

[0035] Figure 5 FIG. 5 is a second sectional view of the adjustable partition plate assembly according to the application, ​

[0036] Figure 6 Figure 1 is a structure diagram of the flip plate driving assembly of the adjustable partition assembly of the present application,

[0037] Figure 7 Figure 4 is a partial structure diagram of the weir pool of the slurry coating device after the flip plate rotates.

[0038] In the figure: 1 - partition, 101 - nut sleeve, 102 - first support sleeve, 103 - sliding guide plate, 2 - flip plate, 3 - screw rod, 301 - snap ring, 4 - first polygonal rod, 5 - U-shaped rod, 6 - hand wheel, 7 - top rod, 701 - spring seat, 702 - sliding block, 703 - inclined sliding groove, 8 - spring, 9 - connecting plate, 901 - waist-shaped hole, 10 - connecting frame, 11 - rack, 12 - gear, 1201 - rotating shaft, 13 - servo motor, 1301 - connecting shaft, 14 - telescopic control device, 15 - second polygonal rod, 16 - weir pool shell, 1601 - limiting hole, 1602 - clamping groove, 1603 - support plate, 1604 - second support sleeve. DETAILED DESCRIPTION

[0039] The accompanying drawings are the best mode embodiment of the slurry coating device, which will be further described in detail below in combination with the drawings.

[0040] As shown in Figures 1 to 6 Figure 1 is a slurry coating device, which comprises a headbox, and the weir pool inside the headbox is provided with an adjustable partition assembly.

[0041] The adjustable partition assembly comprises a partition 1 and a screw rod 3. The partition 1 is arranged between the throat roll and the gate roll of the weir pool, that is, between the first and second even pulp rollers. The top of the partition 1 extends above the top of the weir pool shell 16. In order to ensure the vertical arrangement of the partition 1, a clamping groove 1602 is fixed on the weir pool shell 16, and the upper half of the partition 1 is clamped in the clamping groove 1602, so as to ensure that the partition 1 can effectively separate the slurry in the weir pool.

[0042] The partition 1 is fixed with a nut sleeve 101, and the screw rod 3 is threadedly connected in the nut sleeve 101. The upper end of the screw rod 3 penetrates outside the weir pool shell 16, and the screw rod 3 is rotationally connected with the weir pool shell 16.

[0043] In order to prevent the partition 1 from being displaced or tilted under the impact of the slurry, a plurality of limiting holes 1601 are arranged vertically and spaced apart on the inner wall of the weir pool shell 16.

[0044] The top rod 7 is arranged on the partition 1 and is arranged horizontally. The top rod 7 is arranged on the lower half of the partition 1. The adjustable partition assembly further comprises a top rod control assembly, which controls the top rod 7 to enter and exit the limiting hole 1601.

[0045] The top rod 7 front end passes through the through hole of the raised side wall of the partition plate 1 and the first support sleeve 102 fixed on the partition plate 1, and the top rod 7 is provided with a spring seat 701 located between the raised side wall of the partition plate 1 and the first support sleeve 102. The top rod 7 is sleeved with a spring 8 located between the spring seat 701 and the first support sleeve 102.

[0046] The rear end of the top rod 7 is fixed with a sliding block 702, and the top rod control assembly controls the movement of the sliding block 702. Further, the partition plate 1 is connected with two symmetrically arranged top rods 7, and the top surface of the sliding block 702 is recessed with an inclined sliding groove 703, and one end of the inclined sliding groove 703 is lower than the other end towards the spring 8.

[0047] The top rod control assembly comprises a downward arranged U-shaped rod 5, and the bottom ends of the two edge rods of the U-shaped rod 5 are respectively abutted with the inclined sliding grooves 703 of the sliding blocks 702 connected with the two top rods 7.

[0048] The top end of the first polygonal rod 4 is inserted into the outside of the screw rod 3. The top of the first polygonal rod 4 is fixed with a hand wheel 6.

[0049] A sliding guide rail 103 fixedly connected with the partition plate 1 is arranged below the sliding block 702, and the sliding block 702 is slidingly connected with the sliding guide rail 103. Under the pushing of the spring 8, the top rod 7 is inserted into the limiting hole 1601, and the sliding block 702 moves towards the limiting hole 1601, so that the U-shaped rod 5 abuts with the high point position of the inclined sliding groove 703.

[0050] When adjusting the height of the partition plate 1, first press down the hand wheel 6, drive the U-shaped rod 5 to move downward through the first polygonal rod 4, and in the guiding action of the inclined sliding groove 703, the sliding block 702 is pushed away from the limiting hole 1601 in the downward moving process of the edge rod of the U-shaped rod 5, so that the top rod 7 slides out of the limiting hole 1601, and the locking between the partition plate 1 and the weir pool shell 16 is released. Then rotate the hand wheel 6, drive the screw rod 3 to rotate through the first polygonal rod 4, and then drive the partition plate 1 to move up and down.

[0051] A support plate 1603 is arranged on the top of the weir pool shell 16, and the top of the screw rod 3 is fixed with two spaced apart clamping rings 301, the screw rod 3 passes through the support plate 1603, and the two clamping rings 301 are located on the upper and lower sides of the support plate 1603 respectively.

[0052] After the retrofit of adding adjustable baffle assembly to the existing headbox, the flow path of pulp in the headbox is as follows: the pulp first enters the weir pool, flows through the throat roller (the first uniform pulp roller) for preliminary uniform pulp, and is separated by the baffle 1 to form a relatively independent steady flow area, in which the pulp flow rate is buffered and stabilized; then, the stabilized pulp flows through the gate roller (the second uniform pulp roller) for secondary uniform pulp, further improving the uniformity of the pulp; finally, the pulp that has been uniformly pulped twice and stabilized is uniformly sprayed and coated onto the wire through the pulp spraying port.

[0053] By adjusting the height of the baffle 1 and adjusting the speed of the throat roller and the gate roller, the height and flow rate of the pulp in the weir pool can be precisely controlled. When producing paper products with different grammage, if the amount of pulp needs to be adjusted, the height of the baffle 1 can be raised or lowered to change the gap between the baffle 1 and the bottom of the weir pool, thereby adjusting the residence time and flow rate of the pulp in the steady flow area; at the same time, the speed of the throat roller and the gate roller is adjusted to optimize the uniform pulp effect and ensure that the pulp always remains stable, ultimately making the paper sheet sprayed onto the wire meet the quality requirements.

[0054] Taking the production of high-grammage packaging paper with a basis weight of 300 g / m 2 as an example, the specific adjustment steps are as follows:

[0055] Start the paper machine and deliver pulp to the headbox. In the initial state, lower the baffle 1 to the lowest height and observe the flow of the pulp.

[0056] Gradually increase the amount of pulp delivery, when the amount of pulp reaches the demand of high-grammage production, manually rotate the handwheel 6 to raise the baffle 1, and observe the change of the pulp height in the weir pool until the pulp height is stable in the preset range (set according to the basis weight requirement of the paper sheet, usually 2 / 3-3 / 4 of the height of the weir pool).

[0057] Adjust the speed of the throat roller to 800-1000 r / min for preliminary uniform pulp, and adjust the speed of the gate roller to 600-800 r / min for secondary uniform pulp, to ensure that there is no vortex and flow rate fluctuation in the steady flow area.

[0058] Observe the state of the paper sheet after the pulp spraying and coating onto the wire, if the local basis weight deviation of the paper sheet is found to be large, the height of the baffle 1 (the adjustment range is not more than 5 mm each time) or the speed of the throat roller and the gate roller can be adjusted slightly until the basis weight of the paper sheet is uniform and meets the quality standards.

[0059] The height adjustment of the baffle 1 is determined by the grammage of the paper product, but in actual use, the speed of the throat roller and the gate roller will fluctuate in a small range, in order to respond in time when the speed of the throat roller changes, the adjustable baffle assembly can adjust the gap between the baffle 1 and the bottom of the weir pool. In the embodiment, the bottom of the baffle 1 is rotatably connected with a flap 2, and the weir pool shell 16 is provided with a flap driving assembly for controlling the rotation of the flap 2. By changing the angle of the flap 2, the rotation of the throat roller is realized.

[0060] A speed sensor is arranged on the rotating shaft of the throat roller to measure the speed of the throat roller, and the speed sensor is electrically connected with the flap driving assembly.

[0061] The flap driving assembly comprises a connecting plate 9, a connecting frame 10, a rack 11 and a gear 12.

[0062] The connecting plate 9 is fixedly connected with one end of the flap 2 away from the pulp flow direction, the connecting plate 9 is provided with a waist-shaped hole 901, the connecting frame 10 is slidably arranged in the waist-shaped hole 901, the connecting frame 10 is fixedly provided with a vertically arranged rack 11 above, the upper end of the rack 11 penetrates through the through hole in the top of the weir pool shell 16, and the gear 12 is rotatably arranged outside the weir pool shell 16 and is in meshing connection with the rack 11.

[0063] The top of the weir pool shell 16 is fixedly provided with a servo motor 13, and the servo motor 13 drives the gear 12 to rotate.

[0064] The rotating shaft 1201 of the gear 12 penetrates through the second support sleeve 1604 fixedly arranged on the weir pool shell 16, and the second polygonal rod 15 is slidably arranged in the rotating shaft 1201.

[0065] The output end of the servo motor 13 is provided with a connecting shaft 1301, and the front end face of the connecting shaft 1301 is concavely provided with a coaxially arranged polygonal recess.

[0066] The end of the second polygonal rod 15 away from the servo motor 13 is provided with a telescopic control device 14, the end of the telescopic rod of the telescopic control device 14 is rotatably connected with the second polygonal rod 15, and the telescopic control device 14 drives the second polygonal rod 15 to be inserted into or separated from the polygonal recess of the connecting shaft 1301. The telescopic control device 14 can adopt an electromagnet, and the end of the second polygonal rod 15 towards the connecting shaft 1301 is chamfered to facilitate insertion. Figure 7 The position relationship between the flap 2 and the baffle 1 after the flap 2 is rotated by a certain angle.

[0067] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A slurry coating device comprising a headbox, characterized in that: an adjustable baffle assembly is arranged inside the weir pool of the headbox; the adjustable baffle assembly comprises a baffle (1) and a screw rod (3), the baffle (1) is fixed with a nut sleeve (101), the screw rod (3) is arranged through the nut sleeve (101) and is threadedly connected with the nut sleeve (101); the screw rod (3) is arranged through the weir pool shell (16) and is rotatably connected with the weir pool shell (16).

2. The slurry coating device according to claim 1, characterized in that: a plurality of limiting holes (1601) are arranged on the inner wall of the weir pool shell (16) in vertical and spaced manner; a top rod (7) is arranged on the baffle (1) in sliding manner, the adjustable baffle assembly comprises a top rod control assembly, and the top rod control assembly controls the top rod (7) to enter and exit the limiting holes (1601).

3. The slurry coating device according to claim 2, characterized in that: the top rod (7) is arranged through a through hole in the side wall of the baffle (1) and a first support sleeve (102) fixed on the baffle (1); a spring seat (701) is arranged on the top rod (7), the spring seat (701) is located between the side wall of the baffle (1) and the first support sleeve (102), a spring (8) is arranged on the top rod (7), and the spring (8) is located between the spring seat (701) and the first support sleeve (102); a sliding block (702) is fixed on the rear end of the top rod (7), and the top rod control assembly controls the sliding block (702) to move.

4. The slurry coating device according to claim 3, characterized in that: two top rods (7) are arranged on the baffle (1) in symmetrical manner, an inclined sliding groove (703) is arranged on the top surface of the sliding block (702), and the end of the inclined sliding groove (703) facing the spring (8) is lower than the other end; the top rod control assembly comprises a U-shaped rod (5) arranged downward, the two bottom ends of the U-shaped rod (5) are respectively abutted with the inclined sliding grooves (703) of the sliding blocks (702) connected with the two top rods (7); a first polygonal rod (4) is fixed above the U-shaped rod (5), a polygonal through hole is arranged in the middle of the screw rod (3), the first polygonal rod (4) is arranged through the polygonal through hole of the screw rod (3), and the top end of the first polygonal rod (4) is arranged through the screw rod (3) and is arranged above the screw rod (3).

5. The slurry coating device according to claim 4, characterized in that: a hand wheel (6) is fixed on the top of the first polygonal rod (4).

6. The slurry coating device according to any one of claims 1 to 5, characterized in that: a flap (2) is rotatably connected to the bottom of the baffle (1), and a flap driving assembly is arranged on the weir pool shell (16) and controls the rotation of the flap (2).

7. The slurry coating device according to claim 6, characterized in that: the flap driving assembly comprises a connecting plate (9), a connecting frame (10), a rack (11) and a gear (12). The connecting plate (9) is fixedly connected with the end of the turning plate (2) away from the direction of the slurry flow, a waist-shaped hole (901) is arranged on the connecting plate (9), the bottom frame of the connecting frame (10) is slidably arranged in the waist-shaped hole (901), a vertical rack (11) is fixedly arranged on the connecting frame (10), the upper end of the rack (11) penetrates through the through hole in the top of the weir pool shell (16), a gear (12) is rotatably arranged outside the weir pool shell (16), and the gear (12) is in meshing connection with the rack (11). The top of the weir pool shell (16) is fixedly connected with a servo motor (13), and the servo motor (13) drives the gear (12) to rotate.

8. The slurry coating device according to claim 7, characterized in that: The rotating shaft (1201) of the gear (12) penetrates through the second support sleeve (1604) fixedly arranged on the weir pool shell (16), and a second polygonal rod (15) is arranged in the rotating shaft (1201) and is slid along the axial direction of the rotating shaft (1201); The output end of the servo motor (13) is provided with a connecting shaft (1301), and a polygonal recess is arranged coaxially on the front end surface of the connecting shaft (1301); The end of the second polygonal rod (15) away from the servo motor (13) is provided with an extension control device (14), the end of the extension rod of the extension control device (14) is rotatably connected with the second polygonal rod (15), and the extension control device (14) drives the second polygonal rod (15) to be inserted into or separated from the polygonal recess of the connecting shaft (1301).

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