Wet forming wire structure of fibrous material web

Abstract

The invention relates to a fiber material web wet-process forming net part structure, which comprises a forming net comprising an inclined section and a horizontal section which are sequentially connected from front to back, and a preset included angle is formed between the inclined section and the horizontal plane; the roller set is connected with the forming net and used for driving the forming net to operate continuously; the dewatering mechanism comprises a plurality of vacuum dewatering units which are sequentially arranged in the running direction of the forming net, and the vacuum dewatering units are arranged below the inclined section and the horizontal section respectively; the breast roll lifting mechanism is connected with the forming net and used for replacing the forming net. According to the fiber material web wet forming net part structure designed by the invention, by adopting a composite dehydration section structure combining an inclined section and a horizontal section, the efficient adaptability to various fiber slurries with different beating degrees, different fiber lengths and different slurry concentrations is realized; therefore, the problem that existing wet forming equipment is poor in adaptability when meeting the production requirements of multiple varieties, small batches, frequent production change and the like is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of equipment for wet forming of fiber material webs, in particular to a mesh structure for wet forming of fiber material webs. Background Art

[0002] In the prior art, the net structure of wet forming of fiber material web is mainly divided into inclined net forming, long net forming and round net forming, etc. Among them, the dewatering section of the inclined net forming is a section of inclined forming net, and its net concentration is relatively low, usually a few ten-thousandths, the dewatering section is short, and the dewatering load per unit area is large, so it is more suitable for the forming of long fiber slurry with low beating degree or no beating, while the dewatering section of the long net forming is a section of horizontal forming net, and its net concentration is relatively high, usually a few thousandths, the dewatering section is long, and the dewatering load per unit area is relatively small, so it is more suitable for the forming of fiber slurry with medium-low beating degree to high beating degree, and different net dewatering lengths need to be designed for slurries with different beating degrees and production speeds; the dewatering section of the round net forming is a section of circular arc, and its length is short and difficult to adjust.

[0003] At present, with the rapid development of paper-based functional materials, product varieties and series are increasing, the scale of a single product is relatively small, the frequency of production change is very high, and the performance parameters of different products such as basis weight, beating degree, fiber length, etc. are quite different, resulting in significant differences in the demand for dewatering load. However, the existing wet forming wire structure is difficult to meet the production needs of multiple products and high adaptability, especially when frequent production changes are required, its production efficiency and flexibility are difficult to meet the requirements. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a fibrous material web wet-forming mesh structure which significantly improves the adaptability of the fibrous material web wet-forming mesh structure to different pulps by combining an inclined section and a horizontal section dewatering structure.

[0005] In order to achieve the above-mentioned object, the fiber material web wet forming mesh structure designed by the present invention comprises:

[0006] The forming net comprises an inclined section and a horizontal section connected in sequence front and back, wherein the inclined section is arranged at a predetermined angle with the horizontal plane; a roller group is transmission-connected to the forming net and is used to drive the forming net to run continuously;

[0007] A dehydration mechanism, comprising a plurality of vacuum dehydration units, wherein the plurality of vacuum dehydration units are sequentially arranged below the inclined section and the horizontal section along the running direction of the forming wire;

[0008] A breast roll lifting and lowering mechanism, connected to the forming mesh and used for replacing the forming mesh;

[0009] Among them, the vacuum dehydration unit arranged below the inclined section is used to perform preliminary shaping and dehydration on the fiber slurry distributed on the inclined section, and the vacuum dehydration unit arranged below the horizontal section is used to perform secondary shaping and dehydration on the fiber slurry after the preliminary shaping and dehydration by the inclined section; the start and stop states and dehydration intensity of each of the vacuum dehydration units can be independently controlled; the shaping waterline of the fiber material suspension is located on the inclined section or the horizontal section.

[0010] Preferably, the dehydration mechanism further comprises a gravity dehydration unit, which is arranged below the inclined section and has a fixed dehydration intensity.

[0011] Preferably, the gravity dewatering unit comprises forming plates and / or table rollers sequentially arranged along the running direction of the forming wire.

[0012] Preferably, the angle of the inclined section relative to the horizontal plane is 1-30°.

[0013] Preferably, the length of the inclined section is 1-12 m.

[0014] Preferably, the vacuum dehydration units are all vacuum forming boxes.

[0015] Preferably, the roller group comprises a finishing roller arranged above the horizontal section, the axis of the finishing roller is arranged parallel to the horizontal section, and is used for modifying the surface of the fibrous material web.

[0016] Preferably, a secondary headbox for secondary forming the fibrous material web is arranged above the horizontal section, and the position of the secondary headbox is adjustable forward and backward along the running direction of the forming wire on the horizontal section.

[0017] Preferably, the breast roller lifting and lowering mechanism includes a first rotating fulcrum arranged below the front part of the inclined section, a rotating arm rotating around the first rotating fulcrum and a breast roller arranged on the rotating arm; the forming net is wound around the breast roller and extends obliquely upward to form the inclined section.

[0018] Preferably, it also includes a second rotation fulcrum arranged on one side of the inclined section and a first white water tray arranged below the inclined section, one side of the first white water tray is connected to the rotating arm, and the other side rotates around the second rotation fulcrum.

[0019] Preferably, the first white water tray includes a front guide arc plate, a drainage trough and a rear guide arc plate, the drainage trough is located below the middle of the inclined section and extends along the width direction of the forming net, and the guide arc plate and the rear guide arc plate are respectively fixedly installed on both sides of the drainage trough.

[0020] Preferably, a support arm is further provided in front of the rotating arm, and the rotating arm is fixedly mounted on the support arm by a fastener.

[0021] Preferably, the roller group also includes a couch roller, a tension roller and a transition roller, and the forming mesh is wound around the couch roller, the tension roller, the breast roller and the transition roller in sequence; the vacuum dehydration unit below the inclined section is arranged between the breast roller and the transition roller, and is located above the first white water tray.

[0022] The fiber material web wet forming mesh structure designed by the present invention realizes high-efficiency adaptability to a variety of fiber slurries with different beating degrees, different fiber lengths and different slurry concentrations by adopting a composite dewatering section structure combining an inclined section and a horizontal section, thereby effectively solving the problem of insufficient adaptability of existing wet forming equipment when facing production requirements such as multiple varieties, small batches, and frequent production changes. In addition, the equipment is also equipped with a breast roll lifting and lowering mechanism and an adjustable white water tray, which effectively shortens the net changing time, reduces the difficulty of net changing operation, further improves production efficiency, and provides strong support for realizing flexible production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the wet-forming mesh structure of a fiber material web provided in an embodiment of the present application.

[0024] Figure 2 It is a schematic diagram of the structure of the breast roller lifting and lowering mechanism provided in an embodiment of the present application.

[0025] Among them: forming mesh 10, inclined section 11, horizontal section 12, roller group 20, couching roller 21, tensioning roller 22, table roller 23, transition roller 24, vacuum dehydration unit 30, breast roller lifting mechanism 40, first rotating fulcrum 41, rotating arm 42, breast roller 43, forming plate 44, cantilever 441, scraper 45, second rotating fulcrum 50, first white water tray 60, second white water tray 61, front guide arc plate 61, drainage trough 62, rear guide arc plate 63, support arm 70, frame 80. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] like Figure 1 to Figure 2 As shown, the fiber material web wet forming mesh structure described in this embodiment is intended to meet the production needs of multiple products and high adaptability through the combination of the inclined mesh segment and the horizontal mesh segment and the adjustment of the strength of the vacuum dehydration unit. The mesh structure mainly includes a forming mesh 10, a roller group 20, a dehydration mechanism and a breast roll lifting mechanism 40 installed on a frame 80. Among them, the breast roll lifting mechanism 40 is connected to the forming mesh 10 and is used to replace the forming mesh 10. Its specific structure will be described in detail in subsequent embodiments.

[0028] The forming mesh 10 includes an inclined section 11 and a horizontal section 12 connected in sequence. The inclined section 11 is set at a predetermined angle with the horizontal plane, and the angle can be adjusted according to actual production needs to optimize the dehydration effect and the forming process. In this embodiment, the range of the predetermined angle is usually between 1° and 30°, preferably 5°, 10° or 20°. For example, for low-beating pulp that requires rapid dehydration, a larger inclination angle can be used to enhance the gravity dehydration effect; while for pulp that requires more fine forming, a smaller inclination angle can be used to reduce the impact on the paper web. In addition, the combination of the inclined section 11 and the horizontal section 12 provides a flexible process option for subsequent pulp dehydration, and realizes the division of labor and cooperation between preliminary dehydration and fine forming. The length of the inclined section 11 also affects the dehydration effect. In this embodiment, the length of the inclined section 11 can be set to 1-12m, and different lengths can be selected according to actual needs. For example, for pulp that requires a longer pre-dehydration time, the length of the inclined section 11 can be appropriately increased to improve the pre-dehydration efficiency. Specifically, the length of the inclined section 11 can be set to 1 m, 3 m or 5 m.

[0029] The roller group 20 is connected to the forming mesh 10 and is used to drive the forming mesh 10 to run continuously. The roller group 20 specifically includes a couch roller 21, a tension roller 22 and a transition roller 24. The forming mesh 10 is sequentially wound around the couch roller 21, the tension roller 22 and the transition roller 24 to achieve tensioning, driving and guiding of the forming mesh 10, ensuring that the forming mesh 10 maintains a stable tension and motion trajectory during operation.

[0030] The dehydration mechanism includes a plurality of vacuum dehydration units 30, which are sequentially arranged below the inclined section 11 and the horizontal section 12 along the running direction of the forming mesh 10. Preferably, these vacuum dehydration units 30 are vacuum forming boxes, and the structural design of the vacuum forming box can effectively form a vacuum environment, thereby generating a strong suction force to quickly and efficiently remove moisture from the slurry. By reasonably arranging and controlling these vacuum dehydration units, refined control of the slurry dehydration process can be achieved.

[0031] The vacuum dehydration unit 30 disposed below the inclined section 11 is used to perform preliminary forming and dehydration on the fiber slurry arranged on the inclined section 11. The preliminary forming and dehydration has a high dehydration intensity to quickly remove most of the water in the slurry to form a preliminary wet paper web, while the vacuum dehydration unit 30 disposed below the horizontal section 12 is used to perform secondary forming and dehydration on the fiber slurry after the preliminary forming and dehydration of the inclined section 11. The secondary forming and dehydration has a low dehydration intensity to remove the remaining water in the slurry in a gentle manner, thereby ensuring the forming quality of the fiber material web. For example, for a paper web requiring high-quality surface finish, the vacuum degree of the vacuum dehydration unit below the horizontal section 12 can be adjusted to make its action softer, thereby reducing the disturbance to the paper web. In this embodiment, the forming waterline of the fiber material suspension is located on the inclined section 11 or the horizontal section 12. The position of the forming waterline can be flexibly configured according to actual needs to meet the needs of different processes. For example, for a paper web requiring uniform forming, the forming waterline can be set on the horizontal section 12.

[0032] In addition, the start and stop states and dehydration intensity of each vacuum dehydration unit 30 can be independently controlled. This means that different dehydration intensities can be achieved by controlling the vacuum degree or pressure of different vacuum dehydration units 30. This independent control feature enables the forming mesh 10 to flexibly adapt to pulps with different beating degrees, different fiber lengths, and different pulp concentrations. For example: for low beating degree or long fiber pulp, the dehydration intensity of the vacuum dehydration unit 30 below the inclined section 11 can be increased to quickly remove water, and the dehydration intensity of the vacuum dehydration unit 30 below the horizontal section 12 can be appropriately reduced to avoid excessive dehydration and maintain the structure of the fiber; while for high beating degree pulp, the dehydration intensity of the vacuum dehydration unit 30 below the inclined section 11 can be reduced to avoid fiber blockage caused by rapid dehydration, and the dehydration intensity of the vacuum dehydration unit 30 below the horizontal section 12 can be increased to achieve gentle dehydration and ensure the forming quality. Through this flexible dehydration intensity adjustment, the dehydration process can be optimized to achieve good adaptation to various different pulps.

[0033] In another embodiment, if Figure 2 As shown, the dewatering mechanism also includes a gravity dewatering unit, which is arranged below the inclined section 11 and has a fixed dewatering intensity. This arrangement makes full use of the inclination angle provided by the inclined section 11, so that the slurry is more easily dehydrated under the action of gravity. It is worth noting that the dewatering intensity of the gravity dewatering unit is fixed, that is, its dewatering capacity mainly depends on the gravity and structural design, and it is not adjustable, which simplifies the operation, ensures reliability, and makes it an ideal choice for preliminary dewatering. In specific implementation, the gravity dewatering unit includes a forming plate 44 and / or a table roller 23 arranged in sequence along the running direction of the forming mesh 10.

[0034] In some embodiments, the roller group 20 includes a finishing roller (not shown) disposed above the horizontal section 12, the axis of the finishing roller being disposed parallel to the horizontal section 12, and used to modify the surface of the fiber material web. The horizontal section 12 is usually located at the latter stage of the forming process, when the fiber material web has been basically formed, has a low moisture content, is more suitable for surface modification, and is not likely to damage the formed paper sheet structure.

[0035] In some embodiments, a secondary headbox (not shown) for secondary forming of the fibrous material web is disposed above the horizontal section 12, and the position of the secondary headbox is adjustable forward and backward along the running direction of the forming wire 10 on the horizontal section 12. The secondary headbox can add a new slurry layer to the surface of the fibrous material web formed on the horizontal section 12 to achieve the formation of a paper web with a layered structure, which can produce more diversified products to meet different market demands.

[0036] In some embodiments, Figure 2 As shown, the breast roller lifting and lowering mechanism 40 includes a first rotating fulcrum 41 arranged at the lower front part of the inclined section 11, a rotating arm 42 rotating around the first rotating fulcrum 41, and a breast roller 43 arranged on the rotating arm 42; the forming net 10 is wound around the breast roller 43 and extends obliquely upward to form the inclined section 11.

[0037] With this structural design, during normal operation, a support arm 70 is further provided in front of the rotating arm 42, and the rotating arm 42 is fixedly mounted on the support arm 70 by fasteners, and the breast roller 43 keeps the forming net 10 in the working position for the production of the fiber material web. When the forming net 10 needs to be replaced, the operator first releases the fixation of the support arm and the rotating arm 42, and then pushes or uses other tools to drive the rotating arm 42 to rotate downward around the first rotating fulcrum 41, and at this time, the breast roller 43 also rotates accordingly, so that the running path of the forming net 10 becomes shorter and the network tension is relaxed. At this time, the operator can easily remove the old forming net 10 and replace it with a new forming net 10. After completing the net replacement, the operator rotates the rotating arm 42 back to its original position and fixes it with the support arm, so that the forming net 10 is re-tensioned, and the equipment can resume normal production. The operation is simple and fast, which greatly shortens the time required for net replacement, improves production efficiency, and makes the net replacement operation process safer and more reliable.

[0038] In this embodiment, if Figure 2 As shown, a scraper 45 is also installed on the rotating arm 42. The scraper 45 is located beside the breast roller 43. The main function of the scraper 45 is to scrape off the fibers, impurities or other residues adhering to the breast roller 43 to prevent them from accumulating on the breast roller 43 and affecting subsequent production.

[0039] In some embodiments, Figure 2As shown, it also includes a second rotation fulcrum 50 arranged on one side of the inclined section 11 and a first white water tray 60 arranged below the inclined section 11. One side of the first white water tray 60 is connected to the rotating arm 42, and the other side rotates around the second rotation fulcrum 50. Through the cooperation of the second rotation fulcrum 50 and the first white water tray 60, the first white water tray 60 can rotate in coordination with the rotating arm 42, thereby avoiding interference between the breast roller 43, the forming plate 44 and other components and the first white water tray 60 during the net changing operation, and providing necessary space for smooth net changing operation. In this embodiment, a second white water tray 61 is arranged below the straight section 12.

[0040] In some embodiments, Figure 2 As shown, the first white water tray 60 includes a front guide arc plate 61, a drainage groove 62 and a rear guide arc plate 63. The drainage groove 62 is located below the middle of the inclined section 11 and extends along the width direction of the forming net 10. The guide arc plate and the rear guide arc plate 63 are respectively fixedly installed on both sides of the drainage groove 62. In actual work, the arc structure of the front guide arc plate 61 and the rear guide arc plate 63 can ensure that the wastewater generated during the dehydration process smoothly enters and discharges the drainage groove 62, thereby avoiding splashing or backflow of the water flow. In the drainage groove 62, the water flow will converge and flow along the length direction of the drainage groove 62, and finally be smoothly discharged through the rear guide arc plate 63, which is convenient for wastewater collection and unified treatment.

[0041] In a specific embodiment, Figure 2 A cantilever 441 is fixedly mounted on the frame 80 , and the rear guide arc plate 63 is hingedly connected to the cantilever 441 , that is, by fixing the cantilever 441 on the frame 80 , a reliable supporting structure is provided for the rear guide arc plate 63 .

[0042] In some embodiments, Figure 1 , Figure 2 As shown, the height of the support arm 70 is adjustable. Different fiber slurries may require different inclination angles of the inclined section 11. By adjusting the height of the support arm 70, the position of the breast roll 43 can be fine-tuned, thereby changing the angle and length of the inclined section 11 to meet the production requirements of different products, while also meeting the fixing requirements of the inclined section 11 after the inclination angle is adjusted.

[0043] In some embodiments, Figure 1 As shown, the forming mesh 10 is wound around the couch roll 21, the tension roll 22, the breast roll 43 and the transition roll 24 in sequence; the vacuum dehydration unit 30 below the inclined section 11 is arranged between the breast roll 43 and the transition roll 24, and is located above the first white water tray 60. The reasonable arrangement of the roller group can reduce the bending and wear of the forming mesh 10 and extend the service life of the forming mesh 10, and the first white water tray 60 is arranged below the vacuum dehydration unit 30, which can conveniently collect the white water removed from the inclined section 11 and guide it to the drain port, so as to facilitate the recovery and treatment of the white water.

[0044] The fiber material web wet forming mesh structure provided in this embodiment, by adopting a composite dewatering section structure combining an inclined section with a horizontal section, achieves efficient adaptability to a variety of fiber slurries with different beating degrees, different fiber lengths, and different slurry concentrations, thereby effectively solving the problem of insufficient adaptability of existing wet forming equipment when facing production requirements such as multiple varieties, small batches, and frequent production changes. In addition, the equipment is also equipped with a breast roll lifting and lowering mechanism and an adjustable white water tray, which effectively shortens the net changing time, reduces the difficulty of net changing operations, further improves production efficiency, and provides strong support for achieving flexible production.

[0045] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fiber material web wet forming mesh structure, characterized in that: include: The forming net comprises an inclined section and a horizontal section connected in sequence front and back, wherein the inclined section is arranged at a predetermined angle with the horizontal plane; a roller group is transmission-connected to the forming net and is used to drive the forming net to run continuously; A dehydration mechanism, comprising a plurality of vacuum dehydration units, wherein the plurality of vacuum dehydration units are sequentially arranged below the inclined section and the horizontal section along the running direction of the forming wire; A breast roll lifting and lowering mechanism, connected to the forming mesh and used for replacing the forming mesh; Among them, the vacuum dehydration unit arranged below the inclined section is used to perform preliminary shaping and dehydration on the fiber slurry distributed on the inclined section, and the vacuum dehydration unit arranged below the horizontal section is used to perform secondary shaping and dehydration on the fiber slurry after the preliminary shaping and dehydration by the inclined section; the start and stop states and dehydration intensity of each of the vacuum dehydration units can be independently controlled; the shaping waterline of the fiber material suspension is located on the inclined section or the horizontal section.

2. The fibrous material web wet-laid forming wire structure according to claim 1, characterized in that: The dehydration mechanism further comprises a gravity dehydration unit, which is arranged below the inclined section and has a fixed dehydration strength.

3. The fibrous material web wet-laid forming wire structure according to claim 2, characterized in that: The gravity dewatering unit comprises forming plates and / or table rollers which are sequentially arranged along the running direction of the forming wire.

4. The fibrous material web wet-laid forming wire structure according to claim 1, characterized in that: The angle of the inclined section relative to the horizontal plane is 1-30°.

5. The fibrous material web wet-laid forming wire structure according to claim 1, characterized in that: The length of the inclined section is 1-12m.

6. The fibrous material web wet-laid forming wire structure according to claim 1, characterized in that: The vacuum dehydration units are all vacuum forming boxes.

7. The fibrous material web wet-laid forming wire structure according to claim 1, characterized in that: The roller group comprises a finishing roller arranged above the horizontal section, wherein the axis of the finishing roller is arranged parallel to the horizontal section and is used for modifying the surface of the fiber material web.

8. The fibrous material web wet-laid forming wire structure according to claim 1, characterized in that: A secondary headbox for secondary forming the fiber material web is arranged above the horizontal section, and the position of the secondary headbox is adjustable forward and backward along the running direction of the forming wire on the horizontal section.

9. The fibrous material web wet-laid forming wire structure according to any one of claims 1 to 8, characterized in that: The breast roller lifting and lowering mechanism includes a first rotating fulcrum arranged below the front part of the inclined section, a rotating arm rotating around the first rotating fulcrum and a breast roller arranged on the rotating arm; the forming net is wound around the breast roller and extends obliquely upward to form the inclined section.

10. The fibrous material web wet-laid wire structure according to claim 9, characterized in that: It also includes a second rotating fulcrum arranged on one side of the inclined section and a first white water tray arranged below the inclined section, one side of the first white water tray is connected to the rotating arm, and the other side rotates around the second rotating fulcrum.

11. The fibrous material web wet-laid wire structure according to claim 10, characterized in that: The first white water tray includes a front guide arc plate, a drainage trough and a rear guide arc plate. The drainage trough is located below the middle of the inclined section and extends along the width direction of the forming net. The guide arc plate and the rear guide arc plate are respectively fixedly installed on both sides of the drainage trough.

12. The fibrous material web wet-laid wire structure according to claim 10, characterized in that: A support arm is also provided in front of the rotating arm, and the rotating arm is fixedly mounted on the support arm via a fastener.

13. The fibrous material web wet-laid wire structure according to claim 10, characterized in that: The roller group also includes a couch roller, a tension roller and a transition roller, and the forming mesh is wound around the couch roller, the tension roller, the breast roller and the transition roller in sequence; the vacuum dehydration unit below the inclined section is arranged between the breast roller and the transition roller, and is located above the first white water tray.

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