Wastewater auxiliary drainage device for rotary screen paper machine

Abstract

The invention relates to a waste water auxiliary drainage device for a rotary screen paper machine, which comprises a composite roller, a waste water drainage device and a waste water drainage device, wherein the composite roller is used for extruding coarse cotton cloth and is positioned above a screen part; the water guide mechanism is used for guiding and draining water extruded from the coarse cotton cloth; the water guide mechanism comprises a drainage assembly used for guiding water out; the energy reducing assembly is used for reducing the impact potential energy of water on the drainage assembly; and the water guide mechanism is arranged behind the composite roller along the motion direction of the coarse cotton cloth. According to the rotary screen paper machine, a traditional linear mop is improved into an innovative and adjustable splayed totally-closed dewatering device, so that the problem of water removal in a composite area of the rotary screen paper machine is successfully solved, and the quality of a final product is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of papermaking machinery, and in particular to a wastewater auxiliary drainage device for a cylinder paper machine. Background Technology

[0002] In modern papermaking processes, especially in the production flow of cylinder paper machines, the formation and initial dewatering of the wet paper sheet are crucial steps determining the final product quality and production efficiency. In this process, the wet paper sheet, initially formed by the cylinder wire, is supported and transferred to the subsequent press section by a high-speed running felt. In the composite pressing zone where the wet paper sheet is transferred from the cylinder wire to the felt, the composite rollers apply enormous pressure, instantly squeezing out a large amount of water from the wet paper sheet and the felt. How to quickly and effectively handle this press water has long been a technical challenge in this field.

[0003] To address this issue, the initial technical solution adopted in the industry was to install a straight doctor blade or doctor strip behind the composite roll, along the horizontal direction of the paper machine. This device simply passively blocks the press water, attempting to create a dam. However, this design has significant drawbacks: 1) It cannot actively guide the water flow out, causing a large accumulation of water in front of the doctor blade, forming a chaotic water accumulation zone; 2) The accumulated water flows back to the press area with the felt, causing secondary squeezing and easily resulting in serious paper defects such as embossing and watermarks on the paper surface; 3) When the machine speed is high and the water volume is large, the accumulated water pressure can easily deform the doctor blade, causing water to overflow from the rear, rendering it completely ineffective. Summary of the Invention

[0004] In order to improve the problem of difficult dewatering of the wire section of a cylinder paper machine, this application provides a wastewater auxiliary drainage device for cylinder paper machines.

[0005] The technical solution of the wastewater auxiliary drainage device for a cylinder paper machine provided in this application is as follows: A wastewater auxiliary drainage device for a cylinder paper machine includes: Composite roller: Used to squeeze the felt and located above the web; The water guiding mechanism is used to guide and divert the water squeezed out of the felt. The water guiding mechanism includes: Drainage components for draining water; and Energy reduction components are used to reduce the impact potential energy of water on the diversion components; The water guiding mechanism is located behind the composite roller along the direction of fabric movement.

[0006] Furthermore, the drainage component includes: The water inlet is designed in a figure-eight shape, with the protrusions facing the opposite direction to the felt, and both ends extending beyond the sides of the felt's width. The squeegee guides the water outflow from the felt and separates it from the felt, and is fixedly connected to the water inlet component; The wiper component is located below the water guide component and faces the composite roller. The bottom of the wiper is close to the position where the felt and the composite roller are tangent.

[0007] Furthermore, the end of the wiper component away from the water inlet is set as a pointed tip, and the angle of the pointed tip section is less than 15°, and the bottom of the top of the wiper tip is close to the felt.

[0008] Furthermore, the wiper component is made of engineering plastic or polymer material and is configured in an arc shape.

[0009] Furthermore, the energy reduction component includes: A cover film is adhered to the surface of the wiper element; and The adjustment section is used to generate multiple peaks and troughs in the cover film.

[0010] Furthermore, the adjustment unit includes: Multiple adjusting ropes are provided at equal intervals on the covering film. The adjusting rod is connected to the other end of the adjusting rope; and The drive assembly is used to enable the coordinated movement of multiple adjusting rods.

[0011] Furthermore, the drive group includes: The drive roller is rotatably mounted on the frame of the rotary paper machine; A drive motor is used to control the rotation of the drive roller; and A connector is used to fix the drive roller to the end of the adjusting rod.

[0012] Furthermore, the connector includes: A magnetic ring is used to connect or separate the drive roller from the adjusting rod. The magnetic ring includes a collar and a magnetic ring. The collar is fixedly connected to the end of the adjusting rod, and the magnetic ring is disposed inside the collar and fits against the outside of the drive roller. The magnetic ring is used to attract the drive roller.

[0013] In summary, the beneficial technical effects of this application are as follows: 1. When the water squeezed out by the composite roll encounters the doctor blade and the water guide, it will be naturally and actively guided to the two sides of the paper machine and then quickly discharged, instead of accumulating in the middle. Moreover, in this embodiment, the doctor blade and the felt are sealed to effectively prevent water from overflowing from the back or bottom of the device. 2. As needed, the corresponding magnetic ring can be energized, causing it and the drive roller to rotate. The corresponding adjusting rod then rotates with the drive roller, causing the taut adjusting rope to bulge at the corresponding position on the cover film, thus forming wave peaks and troughs. When the kinetic energy of the water is low, the distance between the adjusting ropes can be increased, increasing the distance between the two wave peaks to accommodate water with lower kinetic energy. This achieves dynamic adjustment of the distance between the wave peaks and troughs of the cover film. The scraper then decomposes the impacting water into multiple sub-streams of varying heights and velocities. By adjusting the distance and height of the wave peaks and troughs, precise dynamic control of the water impact energy, drainage speed, and dewatering uniformity can be achieved. Ultimately, this ensures that the squeezed water is discharged from both sides of the fabric width along the inclined direction of the scraper and the water guide. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0015] Explanation of reference numerals in the attached figures: 1. Net part; 2. Felt cloth; 3. Composite roller; 4. Drainage assembly; 41. Water intake component; 42. Squeegee component; 5. Energy reduction component; 51. Covering film; 52. Adjustment part; 521. Adjustment rope; 522. Adjustment rod; 523. Drive roller; 524. Drive motor; 525. Magnetic ring; 5251. Collar; 5252. Magnetic ring. Detailed Implementation

[0016] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] This application discloses an auxiliary wastewater drainage device for a cylinder paper machine. (Refer to...) Figures 1-2It includes a composite roller 3: used to squeeze the felt 2 and located above the wire section 1; here it is necessary to explain the principle of the cylinder paper machine. Its core part is the wire section 1, which is the cylinder, wrapped in a huge metal cylinder called the cylinder cage. The cylinder cage rotates in a tank filled with pulp (fibers suspended in water). Due to the pressure difference (or vacuum suction), water will pass through the fine mesh on the forming wire, while the pulp fibers are evenly "filtered" on the surface of the wire. As the cylinder cage rotates, this thin layer of fibers forms the initial, extremely wet paper sheet, which is the first step in papermaking; while the felt 2 is a jointless, thick, ring-shaped fabric made of synthetic fibers. The wet paper sheet is very fragile when it is first formed and cannot move on its own. The function of felt 2 is to peel the fragile wet paper sheet off the cylinder wire cage and safely carry it to the next stage. Felt 2 itself has good water permeability and absorbency. In the subsequent pressing process, it will absorb and carry away the water squeezed out from the paper sheet. In the cylinder paper machine, the wire section 1 and felt 2 are closely connected and work together. The running path of felt 2 will be tangent to the highest point of the rotating cylinder wire cage (wire section 1) or in contact with a certain pressure. Composite roller 3 presses felt 2 tightly onto the wet paper sheet on the surface of the cylinder wire cage. Because the wet paper sheet is easier to adhere to felt 2 than to the metal wire, it will detach from the cylinder wire and be "stuck" to felt 2. As felt 2 continues to move forward, the pressure of composite roller 3 will instantly squeeze out a large amount of water from the wet paper sheet and felt 2. This water is the water that needs to be guided out in this embodiment of the invention.

[0018] A water guiding mechanism is used to guide and divert the water squeezed out on the felt 2. The water guiding mechanism includes: a diversion component 4 for draining the water; and an energy reduction component 5 for reducing the impact potential energy of the water on the diversion component 4. The water guiding mechanism is located behind the composite roller 3 along the movement direction of the felt 2. In response to the technical defect pointed out that if the water is not drained in time, it will easily affect the subsequent paper forming quality. Therefore, it is necessary to use the diversion component 4 to drain the water from both sides of the wide width of the felt 2. The energy reduction component 5 is used to reduce the potential energy of the water impacting the diversion component 4, thereby greatly reducing the probability of the water overturning the diversion component 4, and further ensuring the quality of the formed paper.

[0019] The drainage component 4 includes: a water-guiding element 41, configured in a figure-eight shape, with its protrusions facing the opposite direction to the direction of the felt 2, and both ends extending beyond the sides of the felt 2's width; a squeegee 42, guiding the water out of the felt 2 to separate from the felt 2, and fixedly connected to the water-guiding element 41; the squeegee 42 is positioned below the water-guiding element 41 and facing the composite roller 3; the bottom end of the squeegee 42 is close to the position where the felt 2 and the composite roller 3 are tangent. In this embodiment, the water-guiding element 41 is positioned above the felt 2 to reduce water splashing out from the water-guiding element 41. The wiper moves to the rear of the wiper 42, which is located above the felt 2. During the setting process, the wiper 42 is simply placed on the felt 2 and does not apply pressure to it. Therefore, the felt 2 below the wiper 42 will not be squeezed out of water. One end of the wiper 42 is close to the position where the composite roller 3 is tangent to the felt 2. That is, after the composite roller 3 squeezes water out of the felt 2, it is immediately blocked by the wiper 42. The water is discharged from the direction of the guide along the water guide 41 and the wiper 42.

[0020] The end of the wiper 42 furthest from the water guide 41 is set as a pointed tip, and the angle of the pointed tip is less than 15°. The bottom of the tip of the wiper 42 is close to the felt 2. In this embodiment, if the tip of the wiper 42 is too small, it may easily damage the felt 2. However, if the included angle of its tip is too large, water may easily flow out from the gap between the wiper 42 and the felt 2. Furthermore, the bottom surface of the tip of the wiper 42 is infinitely close to the upper surface of the felt 2, thus greatly improving the water guiding effect of the wiper 42. In this embodiment, both the water guide 41 and the wiper 42 are set in a figure-eight shape. According to the principle of vector decomposition of force, when the water flow is in a certain direction... When a water blade impacts a surface at an angle, its kinetic energy is decomposed into two parts: a positive impact force, perpendicular to the inclined plane, which attempts to push the scraper away. Because it is an angled impact, this component force is much smaller than the total impact force experienced by a straight scraper. The tangential flow force is parallel to the inclined plane. This component force does not produce an impact but instead "pushes" the water flow to slide at high speed along the inclined plane. When the water squeezed out by the composite roller 3 encounters the scraper 42 and the water guide 41, it will be naturally and actively guided to the sides of the paper machine and then quickly discharged, instead of accumulating in the middle. Moreover, in this embodiment, the scraper 42 and the felt 2 are sealed together, which effectively prevents water from overflowing from the rear or bottom of the device.

[0021] The wiper element 42 is made of engineering plastics or polymer materials and is designed in an arc shape. Common materials include ultra-high molecular weight polyethylene, which has an extremely low coefficient of friction and excellent wear resistance, effectively wiping water without damaging the expensive felt 2; or polyurethane, which has good elasticity and wear resistance, better conforming to the surface of the felt 2 and providing a "sealed" wiping effect. By making the wiper element 42 arc-shaped, it firstly greatly reduces the kinetic energy of the water, thereby reducing the height of the water movement. That is, it converts part of the kinetic energy of the water into gravitational potential energy. Its main purpose is to greatly reduce the probability of water crossing the water guide element 41, thus allowing the water to be guided out from both sides of the width of the felt 2.

[0022] The energy reduction component 5 includes: a cover film 51, which is adhered to the surface of the wiper 42; and an adjustment part 52, which is used to make the cover film 51 generate multiple peaks and troughs. In this embodiment, the cover film 51 is made of a material with elastic properties such as silicone rubber or polyurethane. The adjustment part 52 is used to make the cover film 51 form multiple peaks and troughs along the width direction of the fabric 2. By setting the cover film 51 on the surface of the wiper 42 and the cover film 51 being able to generate a peak and trough structure, the wiper 42 can decompose the impacting water into multiple sub-flows with different heights and flow rates. By adjusting the distance and height of the crests and troughs, precise dynamic control of the water flow impact energy, drainage speed, and dewatering uniformity can be achieved. Furthermore, within a certain range, the closer the distance between the crests and troughs, the better the effect on dissipating impact energy. When the crests and troughs are very close, high-speed, straight water flowing onto this surface is forced to undergo multiple drastic changes of direction within a very short distance, inducing high-intensity, high-frequency turbulence. The denser the waveform, the more intense this transformation process, and the faster the energy dissipation. Tiny water flows reflected from a crest will interfere with water flows about to collide with neighboring crests. Under dense waveforms, this interference phenomenon becomes very complex and frequent; tiny water flows in different directions collide and cancel each other out, further dissipating macroscopic kinetic energy.

[0023] The adjustment unit 52 includes: multiple adjustment ropes 521, evenly spaced on the covering membrane 51; adjustment rods 522 connected to the other end of the adjustment ropes 521; and a drive assembly for coordinating the movement of the multiple adjustment rods 522. The multiple adjustment ropes 521 can be encoded, for example, according to odd and even numbers. One end of each adjustment rope 521 is fixedly connected to the covering membrane 51. In this embodiment, a disc or disc with a hardness greater than that of the covering membrane 51 can be provided on the covering membrane 51. The disc connects the end of the adjustment rope 521 to the covering membrane 51. The adjustment ropes 521 are evenly distributed. However, in actual operation, cameras can be placed at corresponding positions to monitor the water being squeezed out. The kinetic energy is observed. If the kinetic energy is large, the adjustable ropes 521 that are spaced apart can be pulled out to the positions corresponding to the cover film 51. At this time, the positions corresponding to the adjustable ropes 521 are the crests. Due to the elastic properties of the cover film 51, the adjacent pulled adjustable ropes 521 are still in contact with the surface of the wiper 42. Of course, the water impact can also better adhere the cover film 51 to the wiper 42. In this embodiment, the adhesive between the cover film 51 and the wiper 42 is selected as an adhesive that can be repeatedly bonded and is not affected by water. When the kinetic energy of the water is small, the spacing between the adjustable ropes 521 can be increased. At this time, the distance between the two crests increases, which is suitable for water with smaller kinetic energy. Therefore, the effect of dynamically adjusting the distance between the crests and troughs of the cover film 51 is achieved.

[0024] The drive assembly includes: a drive roller 523, rotatably mounted on the frame of the rotary paper machine; a drive motor 524 for controlling the rotation of the drive roller 523; and a connector for fixing the drive roller 523 to the end of the adjusting rod 522. The drive roller 523 can also be rotatably mounted above the water-guiding component 41. The drive motor 524 is mounted on the corresponding frame or the water-guiding component 41, preferably on the frame. The drive motor 524 controls the rotation of the drive roller 523. The connector includes: a magnetic ring 525 for connecting or separating the drive roller 523 from the adjusting rod 522. The magnetic ring 525 includes a collar 5251 and a magnetic ring 5252. The collar 5251 is fixedly connected to the end of the adjusting rod 522, and the magnetic ring 5252 is disposed inside the collar 5251 and fits against the outside of the drive roller 523. Ring 5252 is used to adsorb drive roller 523. The inner wall of collar 5251 is provided with an annular groove, and magnetic ring 5252 is installed in the annular groove. At the same time, the inner wall of collar 5251 is just in contact with the outer wall of drive roller 523. According to the requirements, after the corresponding magnetic ring 5252 is energized, the magnetic ring 5252 and drive roller 523 rotate, and the corresponding adjusting rod 522 rotates with drive roller 523. At this time, the taut adjusting rope 521 drives the corresponding position of the cover film 51 to bulge, thereby forming troughs and peaks. In this embodiment, the width of cover film 51 needs to match the torque of drive roller 523 to ensure that cover film 51 can be successfully pulled up. Of course, in the actual control process, the adjustment requirements for peaks and troughs are less, so it will not affect the service life of cover film 51 or the adhesion effect between cover film 51 and wiper 42.

[0025] The implementation principle of the wastewater auxiliary drainage device for a rotary paper machine in this embodiment is as follows: when the water squeezed out by the composite roller 3 encounters the scraper 42 and the water guide 41, it will be naturally and actively guided to the two sides of the paper machine and then quickly discharged, instead of accumulating in the middle. Moreover, in this embodiment, the scraper 42 and the felt 2 are sealed to effectively prevent water from overflowing from the rear or bottom of the device. According to the requirements, after the corresponding magnetic ring 5252 is energized, the magnetic ring 5252 and the drive roller 523 rotate, and the corresponding adjusting rod 522 rotates together with the drive roller 523. At this time, the taut adjusting rope 521 drives the corresponding position of the cover film 51 to bulge, thus forming wave troughs and peaks. When the kinetic energy of the water is small, the distance between the adjusting rope 521 can be increased. At this time, the distance between the two peaks increases, which is suitable for water with smaller kinetic energy. Therefore, the effect of dynamically adjusting the distance between the peaks and troughs of the cover film 51 is achieved. The scraper 42 can then decompose the impacted water into multiple sub-streams with different heights and flow rates. By adjusting the distance and height of the peaks and troughs, precise dynamic control of the water flow impact energy, drainage speed and dewatering uniformity can be achieved. Ultimately, it can be ensured that the squeezed water is discharged from both sides of the width of the felt 2 along the inclined direction of the scraper 42 and the water guide 41.

[0026] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wastewater auxiliary drainage device for a cylinder paper machine, characterized in that, include: Composite roller: Used to squeeze the felt and located above the web; The water guiding mechanism is used to guide and divert the water squeezed out of the felt. The water guiding mechanism includes: Drainage components for draining water; and Energy reduction components are used to reduce the impact potential energy of water on the diversion components; The water guiding mechanism is located behind the composite roller along the direction of fabric movement.

2. The wastewater auxiliary drainage device for a cylinder paper machine according to claim 1, characterized in that, The drainage component includes: The water inlet is designed in a figure-eight shape, with the protrusions facing the opposite direction to the felt, and both ends extending beyond the sides of the felt's width. The squeegee guides the water outflow from the felt and separates it from the felt, and is fixedly connected to the water inlet component; The wiper component is located below the water guide component and faces the composite roller. The bottom of the wiper is close to the position where the felt and the composite roller are tangent.

3. The wastewater auxiliary drainage device for a cylinder paper machine according to claim 2, characterized in that, The end of the wiper component away from the water inlet is set as a tip, and the angle of the tip section is less than 15°, and the bottom of the tip of the wiper component is close to the felt.

4. The wastewater auxiliary drainage device for a cylinder paper machine according to claim 3, characterized in that, The wiper component is made of engineering plastic or polymer material and is designed in an arc shape.

5. The wastewater auxiliary drainage device for a cylinder paper machine according to claim 4, characterized in that, The energy reduction component includes: A cover film is adhered to the surface of the wiper element; and The adjustment section is used to generate multiple peaks and troughs in the cover film.

6. The wastewater auxiliary drainage device for a cylinder paper machine according to claim 5, characterized in that, The adjustment unit includes: Multiple adjusting ropes are provided at equal intervals on the covering film. The adjusting rod is connected to the other end of the adjusting rope; and The drive assembly is used to enable the coordinated movement of multiple adjusting rods.

7. The wastewater auxiliary drainage device for a cylinder paper machine according to claim 6, characterized in that, The drive group includes: The drive roller is rotatably mounted on the frame of the rotary paper machine; A drive motor is used to control the rotation of the drive roller; and A connector is used to fix the drive roller to the end of the adjusting rod.

8. The wastewater auxiliary drainage device for a cylinder paper machine according to claim 7, characterized in that, The connector includes: A magnetic ring is used to connect or separate the drive roller from the adjusting rod. The magnetic ring includes a collar and a magnetic ring. The collar is fixedly connected to the end of the adjusting rod, and the magnetic ring is disposed inside the collar and fits against the outside of the drive roller. The magnetic ring is used to attract the drive roller.

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