Double-layer headbox for papermaking

Abstract

The utility model belongs to the technical field of papermaking equipment, and particularly relates to a double-layer headbox for papermaking. Comprising a headbox main body, a paper pulp chamber is arranged in the headbox main body, the paper pulp chamber comprises an upper chamber and a lower chamber, the two chambers are respectively connected with a jet cavity through tube bundles, and the jet cavity is composed of a lower lip plate and an upper lip plate; the tissue with better drawing force and better hand feeling can be obtained.

Description

Technical Field

[0001] The utility model belongs to the technical field of papermaking equipment, in particular to a double-layer headbox for papermaking. Background Art

[0002] The headbox is an indispensable key component in the papermaking machine. It forms a jet flow of water and pulp fibers between the forming wires (or between the felt cloth), which is responsible for evenly distributing the pulp on the papermaking wire. The formed paper towels are then dried by a drying cylinder. In order to obtain paper towels with better tensile strength and better feel, a double-layer headbox is required, which can arrange long fibers and short fibers in the double chambers and spray the pulp onto the forming wire in a certain ratio. Utility Model Content

[0003] The purpose of the utility model is to provide a double-layer headbox for papermaking in order to solve the above-mentioned technical problems, so as to obtain a paper towel with better tensile strength and better hand feel.

[0004] In view of this, the utility model provides a double-layer headbox for papermaking, including a headbox body, a pulp chamber is arranged in the headbox body, the pulp chamber includes an upper chamber and a lower chamber, the two chambers are connected to the injection chamber through a tube bundle, and the injection chamber is composed of a lower lip plate and an upper lip plate.

[0005] In the present technical solution, the upper chamber and the lower chamber in the pulp chamber in the main body of the flow box are filled with long fiber pulp and short fiber pulp respectively. Different fiber pulps enter the injection chamber through the tube bundle and are injected outward onto the forming net in a certain proportion. When the formed paper is dried in the drying cylinder, the short fiber layer is on the drying cylinder side. Due to the effect of the drying cylinder, the hand feel will be better. The long fiber layer is on the side away from the drying cylinder (i.e., the air hood side). The long fiber layer is on the outer layer to protect the paper and has better tensile force.

[0006] In the above technical solution, further, a partition plate is horizontally arranged in the injection chamber, and the partition plate separates the pulp with different coarse and fine fibers flowing into the upper chamber and the lower chamber, and the partition plate extends toward the opening direction.

[0007] In the present technical solution, through the setting of the partition plate, the pulp flowing into the injection chamber from the upper chamber is located on the lower side of the partition plate, and the pulp flowing into the injection chamber from the lower chamber is located on the lower side of the partition plate. The partition plate extends toward the opening direction to avoid the pulp of different coarse and fine fibers entering the injection chamber from the tube bundle from being directly mixed when entering the injection chamber, which makes it difficult to control the distribution of coarse and fine fibers in the forming paper.

[0008] In the above technical solution, further, the partition plate and the cross section at one end of the opening are of a pointed cone structure.

[0009] In this technical solution, the pulp on both sides of the partition plate can be better guided to leave from the opening and be sprayed onto the forming net.

[0010] In the above technical solution, further, the partition plate is rotatably connected to the inner wall of the injection chamber at one end away from the opening, and the partition plate is driven by the first cylinder to adjust its angle.

[0011] In the present technical solution, the partition plate is rotatably hinged at one end away from the opening to the inner wall of the injection chamber, the lower end of the partition plate is hinged to the output end of the first cylinder, the first cylinder is fixedly connected to the lower end of the lower lip plate, the output end of the first cylinder passes through the lower lip plate into the injection chamber and is hinged to the partition plate, the output end of the first cylinder can drive the partition plate to rotate and adjust the angle, thereby controlling the mixing ratio of long and short fiber pulps. If the first cylinder is not set to control the partition plate, the flow rate of different long and short fiber pulps above and below the partition plate can be controlled to control the content and distribution of coarse and fine fibers of the long and short fibers of the formed paper towel.

[0012] In the above technical solution, further, the tube bundle includes a first conveying pipe connected to the pulp chamber, one end of the first conveying pipe away from the pulp chamber is connected to a second conveying pipe with a diameter larger than the first conveying pipe, and the other end of the second conveying pipe is connected to the injection chamber.

[0013] In the present technical solution, when the pulp flowing from the pulp chamber through the first conveying pipe enters the second conveying pipe, the ends of the first conveying pipe and the second conveying pipe are connected and have the same axial direction. When the pulp in the first conveying pipe enters the second conveying pipe, the cross-section increases suddenly, thereby ensuring that the pulp flowing into the injection chamber has a uniform flow direction.

[0014] In the above technical solution, further, one end of the upper lip plate is rotatably connected to the headbox body, the upper lip plate is connected to a lip plate cross section adjustment device, the headbox body is provided with a fixed plate, and the fixed plate is connected to a lip plate opening device.

[0015] In the above technical solution, further, the lip opening device includes a connecting rod, one end of which is hinged to the driving seat, and the other end of the connecting rod is driven by the transmission seat to drive the driving seat to move in the moving direction of the connecting rod.

[0016] In the present technical solution, the driving seat is a driving structure composed of a common motor, a turbine and a worm. The turbine is connected to the connecting rod, the turbine and the worm are meshed, the worm is driven by the motor, and the upper lip plate is controlled to move upward through the transmission seat. The patent publication number CN220149968U discloses the above-mentioned specific operating mode, which is consistent with the present utility model, so it will not be elaborated.

[0017] In the above technical solution, further, the lip plate cross section adjustment device is an adjustment jack arranged on the driving seat, and a hand wheel is arranged on the side of the adjustment jack.

[0018] In the technical solution, the grammage of the formed paper is changed by the lip opening. While turning the hand wheel, the specific value can be observed on the micrometer on the top of the adjusting jack to judge the size of the lip width, so as to achieve precise fine-tuning of the distance between the upper lip and the lower lip. It can also be another jack with an adjusting screw and a locking screw. When adjusting the lip width, the locking screw is opened instead. After the adjustment is completed, the locking screw is locked to end the adjustment.

[0019] The beneficial effects of the utility model are:

[0020] 1. The upper chamber and the lower chamber of the pulp chamber in the main body of the headbox are filled with long-fiber pulp and short-fiber pulp respectively. The different fiber pulps enter the injection chamber through the tube bundle and are injected outward onto the forming net in a certain proportion. When the formed paper is dried in the drying cylinder, the short fibers are on the drying cylinder side. Due to the effect of the drying cylinder, the hand feel will be better. The long fibers are on the side away from the drying cylinder (i.e., the air hood side). The long fibers are less released, the dust is less, and the long fibers protect the paper on the outer layer, which has better tensile strength.

[0021] 2. The lower end of the partition plate is hinged to the output end of the first cylinder. The first cylinder is fixedly connected to the lower end of the lower lip plate. The output end of the first cylinder passes through the lower lip plate into the injection chamber and is hinged to the partition plate. The output end of the first cylinder can drive the partition plate to rotate and adjust the angle, thereby controlling the mixing ratio of long and short fiber pulp;

[0022] 3. When the pulp flowing from the pulp chamber through the first conveying pipe enters the second conveying pipe, the ends of the first conveying pipe and the second conveying pipe are connected and have the same axial direction. When the pulp in the first conveying pipe enters the second conveying pipe, the cross-section increases suddenly, ensuring that the pulp flowing into the injection chamber flows evenly;

[0023] 4. The lip opening device and the lip profile adjustment device are used to precisely fine-tune the distance between the upper lip and the lower lip. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model;

[0025] Figure 2 It is a structural schematic diagram of another embodiment of the utility model;

[0026] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0027] Figure 4 It is a schematic diagram of the structure of the tube bundle;

[0028] Figure 5 It is a schematic diagram of the structure of wrinkled paper towels.

[0029] The symbols in the figure are:

[0030] 1. Headbox body; 2. Pulp chamber; 3. Upper chamber; 4. Lower chamber; 5. Tube bundle; 6. Injection chamber; 7. Upper lip plate; 8. Lower lip plate; 9. Drying cylinder; 10. Short fiber layer; 11. Long fiber layer; 12. Partition plate; 13. Opening; 14. First cylinder; 15. Connecting rod; 16. Drive seat; 17. Transmission seat; 18. Fixed plate; 19. First conveying pipe; 20. Second conveying pipe; 21. Adjusting jack; 22. Hand wheel. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0032] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0034] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0035] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0036] Embodiment 1:

[0037] like Figure 1-Figure 5 As shown, this embodiment provides a double-layer headbox for papermaking, including a headbox body 1, a pulp chamber 2 is arranged in the headbox body 1, and the pulp chamber 2 includes an upper chamber 3 and a lower chamber 4. The two chambers are connected to a jet chamber 6 through a tube bundle 5, respectively, and the jet chamber 6 is composed of a lower lip plate 8 and an upper lip plate 7. The upper chamber 3 and the lower chamber 4 in the pulp chamber 2 in the headbox body 1 are filled with long fiber pulp and short fiber pulp respectively. Different fiber pulps enter the jet chamber 6 through the tube bundle 5 and are sprayed outward onto the forming net according to a certain proportion. When the formed paper is dried in the drying cylinder 9, the short fiber layer 10 is on the side of the drying cylinder 9. Due to the effect of the drying cylinder 9, the hand feel will be better. The long fiber layer 11 is on the side away from the drying cylinder 9 (i.e., the air hood side). The long fiber layer 11 is on the outer layer to protect the paper and has better tensile force.

[0038] like Figure 1 and Figure 4As shown, the tube bundle 5 includes a first delivery pipe 19 connected to the pulp chamber 2, and one end of the first delivery pipe 19 away from the pulp chamber 2 is connected to a second delivery pipe 20 with a diameter larger than the first delivery pipe 19, and the other end of the second delivery pipe 20 is connected to the injection chamber 6. When the pulp flowing through the first delivery pipe 19 from the pulp chamber 2 enters the second delivery pipe 20, the ends of the first delivery pipe 19 and the second delivery pipe 20 are connected and have the same axial direction, and the cross-section of the pulp in the first delivery pipe 19 suddenly increases when entering the second delivery pipe 20, so as to ensure that the pulp flowing into the injection chamber 6 flows evenly.

[0039] like Figure 1 As shown, one end of the upper lip plate 7 is rotatably connected to the headbox body 1, and the upper lip plate 7 is connected to a lip plate cross section adjustment device. The headbox body 1 is provided with a fixed plate 18, and the fixed plate 18 is connected to a lip plate opening device. The lip plate opening device includes a connecting rod 15, one end of the connecting rod 15 is hinged to a driving seat 16, and the other end is driven by a transmission seat 17 to drive the driving seat 16 to move in the direction of movement of the connecting rod 15. The driving seat 16 is a common driving structure composed of a motor, a turbine, and a worm. The turbine is connected to the connecting rod 15, the turbine and the worm are meshed, and the worm is driven by the motor to control the upward movement of the upper lip plate 7 through the transmission seat 17. The patent publication number CN220149968U discloses the above-mentioned specific operation mode, which is consistent with the present utility model, so it will not be elaborated.

[0040] The lip plate width adjustment device is an adjustment jack 21 set on the driving seat 16, and a hand wheel 22 is set on the side of the adjustment jack 21. The gram weight of the formed paper is changed by the lip plate opening. While turning the hand wheel 22, the specific value can be observed on the micrometer on the top of the adjustment jack 21 to judge the size of the lip plate width, so as to achieve precise fine-tuning control of the distance between the upper lip plate 7 and the lower lip plate 8. It can also be another jack with an adjustment screw and a locking screw. When adjusting the lip plate width, the locking screw is opened instead, and after the adjustment is completed, the locking screw is locked to end the adjustment.

[0041] Embodiment 2:

[0042] This embodiment provides a double-layer headbox for papermaking, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0043] like Figure 2As shown, the injection chamber 6 is horizontally provided with a partition plate 12, which separates the pulps with different coarse and fine fibers flowing into the upper chamber 3 and the lower chamber 4, and the partition plate 12 extends toward the opening 13. Through the arrangement of the partition plate 12, the pulp flowing into the injection chamber 6 from the upper chamber 3 is located at the lower side of the partition plate 12, and the pulp flowing into the injection chamber 6 from the lower chamber 4 is located at the lower side of the partition plate 12, and the partition plate 12 extends toward the opening 13, so as to avoid the pulps with different coarse and fine fibers entering the injection chamber 6 from the tube bundle 5 from being directly mixed when entering the injection chamber 6, which makes it difficult to control the distribution of coarse and fine fibers in the molding paper.

[0044] The cross section of the partition plate 12 and one end of the opening 13 is a pointed cone structure, which can better guide the pulp on both sides of the partition plate 12 to leave from the opening 13 and be sprayed onto the forming net.

[0045] The end of the partition plate 12 away from the opening 13 is rotatably connected to the inner wall of the injection chamber 6, and the partition plate 12 is driven by the first cylinder 14 to adjust the angle. The end of the partition plate 12 away from the opening 13 is rotatably hinged to the inner wall of the injection chamber 6, and the lower end of the partition plate 12 is hinged to the output end of the first cylinder 14. The first cylinder 14 is fixedly connected to the lower end of the lower lip plate 8. The output end of the first cylinder 14 passes through the lower lip plate 8 and enters the injection chamber 6 and is hinged to the partition plate 12. The output end of the first cylinder 14 can drive the partition plate 12 to rotate and adjust the angle, thereby controlling the mixing ratio of the long and short fiber pulps. If the first cylinder 14 is not set to control the partition plate 12, the flow rate of the different long and short fiber pulps above and below the partition plate 12 can be controlled to control the content and distribution of the coarse and fine fibers of the long and short fibers of the formed tissue.

[0046] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A double-layer headbox for papermaking, characterized in that: The invention comprises a headbox body (1), wherein a pulp chamber (2) is arranged in the headbox body (1), wherein the pulp chamber (2) comprises an upper chamber (3) and a lower chamber (4), wherein the two chambers are connected to an injection chamber (6) through a tube bundle (5), and the injection chamber (6) is composed of a lower lip plate (8) and an upper lip plate (7).

2. A double-layer headbox for papermaking according to claim 1, characterized in that: The injection chamber (6) is horizontally provided with a partition plate (12), the partition plate (12) separates the pulp with different coarse and fine fibers flowing into the upper chamber (3) and the lower chamber (4), and the partition plate (12) extends toward the opening (13).

3. A double-layer headbox for papermaking according to claim 2, characterized in that: The partition plate (12) and the cross section at one end of the opening (13) are of a pointed cone structure.

4. A double-layer headbox for papermaking according to claim 3, characterized in that: The partition plate (12) is rotatably connected to the inner wall of the injection chamber (6) at one end away from the opening (13); the partition plate (12) is driven by the first cylinder (14) to adjust its angle.

5. A double-layer headbox for papermaking according to claim 1, characterized in that: The tube bundle (5) comprises a first delivery tube (19) connected to the pulp chamber (2); one end of the first delivery tube (19) away from the pulp chamber (2) is connected to a second delivery tube (20) having a diameter greater than that of the first delivery tube (19); the other end of the second delivery tube (20) is connected to the injection chamber (6).

6. A double-layer headbox for papermaking according to claim 1, characterized in that: One end of the upper lip plate (7) is rotatably connected to the headbox body (1); the upper lip plate (7) is connected to a lip plate cross section adjustment device; the headbox body (1) is provided with a fixed plate (18); and the fixed plate (18) is connected to a lip plate opening device.

7. A double-layer headbox for papermaking according to claim 6, characterized in that: The lip plate opening device comprises a connecting rod (15), one end of which is hinged to a driving seat (16), and the other end of which is driven by a transmission seat (17) to drive the driving seat (16) to move in the moving direction of the connecting rod (15).

8. A double-layer headbox for papermaking according to claim 6, characterized in that: The lip plate cross section adjustment device is an adjustment jack (21) arranged on a driving seat (16), and a hand wheel (22) is arranged on the side of the adjustment jack (21).

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