Papermaking headbox

Abstract

The utility model discloses a papermaking headbox which comprises a headbox body, a pulp discharge valve is arranged at the lower end of the headbox body, a support plate is fixedly connected to the side wall of the headbox body, the upper end of the headbox body is covered with a top cover, a guide rod is arranged at the upper end of the top cover and penetrates through the support plate, and the support plate is fixedly connected with the headbox body. A homogenizing device is arranged on the bracket plate and can be inserted into the headbox, and a lifting driving device is arranged on the bracket plate and is connected with the top cover. The utility model belongs to the technical field of headboxes, and particularly relates to a papermaking headbox which solves the problem that in the prior art, a stirring rod in the headbox cannot be conveniently separated from the headbox to be detached or cleaned.

Description

Technical Field

[0001] The utility model belongs to the technical field of headboxes, in particular to a papermaking headbox. Background Art

[0002] Papermaking is an important invention of the working people in ancient China. There are two forms: machine-made and hand-made. The machine-made process is carried out continuously on a papermaking machine. The pulp suitable for the quality of paper is diluted with water to a certain concentration, and initially dehydrated in the wire part of the papermaking machine to form wet paper sheets, which are then squeezed and dehydrated, and then dried into paper. The headbox is a key part of a modern paper machine. Its structure and performance play a decisive role in the formation of paper sheets and the quality of paper.

[0003] The headbox in the prior art basically has the function of equalizing the material and can prevent the precipitation and accumulation of fibers. For example, the publication (announcement) number: CN220224759U discloses a pulp and water equalizing device for the headbox of a papermaking machine. With the cooperation of the stirring rod and the stirring blade, the pulp and water inside the box body can be stirred and mixed. With the cooperation of the rotating rod and the spiral blade, the pulp and water inside the box body can be drawn into the cylinder body through the connecting pipe. Under the action of the spiral blade, the pulp and water entering the cylinder body are transported upward and flow to the right through the guide pipe. Under the action of the booster pump, the pulp and water are pressurized to be sprayed into the inner cavity of the box body through the arc pipe and the return pipe. Under the inclined setting of the return pipe, the sprayed pulp and water form a vortex inside the box body, and then the pulp and water are stirred, which effectively prevents the appearance of sediment and floccules in the pulp and water inside the box body, affecting the quality of paper sheets.

[0004] However, there are still some shortcomings: although the inner wall of the headbox can be stirred and scraped, fibers are easily accumulated on the stirring rod and spiral blades during rotation, which makes it inconvenient to disassemble and clean the stirring rod and spiral blades. Therefore, improvements are needed. Utility Model Content

[0005] The technical problem to be solved by the utility model is that it is inconvenient to separate the internal stirring rod of the headbox from the headbox for disassembly or cleaning.

[0006] In order to achieve the above functions, the technical solution adopted by the utility model is as follows: a papermaking headbox, comprising a headbox, a pulp discharge valve is provided at the lower end of the headbox, a bracket plate is fixedly connected to the side wall of the headbox, the upper end of the headbox is covered with a top cover, the upper end of the top cover is provided with a guide rod, the guide rod passes through the bracket plate, a homogenizing device is provided on the bracket plate and can be inserted into the headbox, a lifting drive device is provided on the bracket plate and is connected to the top cover; the lifting drive device comprises a wire drum, the wire drum rotates in the bracket plate, the upper end of the wire drum is fixedly connected to a gear ring, the wire drum is internally threaded with a screw rod, the lower end of the screw rod is fixedly connected to the top cover, a motor 2 is provided on the bracket plate, a gear 2 is provided at the power output end of the motor 2, the gear 2 is meshed with the gear ring, and the lifting and lowering of the top cover can be realized by lifting the screw rod, so that the homogenizing device can be separated upward from the headbox, so that it can be cleaned or disassembled separately, which is convenient for maintenance.

[0007] Furthermore, the homogenizing device includes a motor 1, which is arranged on a bracket plate, and a gear 1 is provided at the output end of the motor 1. A rack column runs through the bracket plate and is always meshed with the gear 1. A connecting shaft is provided at the lower end of the rack column, and an impeller is provided on the connecting shaft. A scraper is provided on the side of the connecting shaft. The impeller is driven to rotate by the gear 1 meshing with the rack column, and the impeller can tumble and homogenize the pulp in the headbox, and the scraper can scrape and clean the side wall of the headbox.

[0008] Preferably, a wear-resistant layer is provided on the outer side of the scraper, and the wear-resistant layer is made of rubber material.

[0009] Preferably, a limit seat is provided at the upper end of the top cover, and the limit seat can limit the upward and downward movement of the rack column.

[0010] Preferably, the headbox is provided with a window, through which the internal conditions of the headbox can be observed.

[0011] Preferably, the impeller can turn the pulp at the bottom of the headbox upward.

[0012] The utility model adopts the above structure to achieve the following beneficial effects:

[0013] 1. The utility model can separate the top cover and the impeller and scraper under the top cover from the headbox by arranging a lifting drive device, so as to facilitate cleaning or disassembly maintenance work separately.

[0014] 2. The utility model can realize the up and down rolling stirring and homogenization of the pulp in the headbox by arranging the homogenizing device, so that the pulp is mixed more thoroughly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is an overall three-dimensional diagram of a papermaking headbox of the utility model;

[0016] Figure 2 This is a three-dimensional diagram of a homogenizing device of a papermaking headbox according to the utility model located inside the headbox;

[0017] Figure 3 for Figure 1 A partial enlarged view of the middle part;

[0018] Figure 4 for Figure 1 A partial enlarged view of point B in the middle.

[0019] Among them, 1. headbox, 2. discharge valve, 3. bracket plate, 4. top cover, 5. guide rod, 6. homogenizing device, 7. lifting drive device, 8. wire drum, 9. gear ring, 10. screw, 11. motor 2, 12. gear 2, 13. motor 1, 14. gear 1, 15. rack column, 16. connecting shaft, 17. impeller, 18. scraper, 19. wear-resistant layer, 20. limit seat, 21. window. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0022] like Figure 1-4 The utility model discloses a papermaking headbox, comprising a headbox 1, a window 21 is provided on the headbox 1, the internal situation of the headbox 1 can be observed through the window 21, a pulp discharge valve 2 is provided at the lower end of the headbox 1, a support plate 3 is fixedly connected to the side wall of the headbox 1, the upper end of the headbox 1 is covered with a top cover 4, the upper end of the top cover 4 is provided with a guide rod 5, the guide rod 5 passes through the support plate 3, a homogenizing device 6 is provided on the support plate 3 and can be inserted into the headbox 1, and a lifting drive device 7 is provided on the support plate 3 and connected to the top cover 4;

[0023] like Figure 1 and 4The lifting drive device 7 includes a wire drum 8, which rotates in the bracket plate 3. A gear ring 9 is fixedly connected to the upper end of the wire drum 8. A screw rod 10 is connected to the inner thread of the wire drum 8. The lower end of the screw rod 10 is fixedly connected to the top cover 4. A motor 2 11 is provided on the bracket plate 3. A gear 2 12 is provided at the power output end of the motor 2 11. The gear 2 12 is meshed with the gear ring 9. The lifting of the screw rod 10 can realize the lifting of the top cover 4, so that the homogenizing device 6 can be separated upward from the headbox 1 to facilitate cleaning or disassembly separately and convenient maintenance.

[0024] like Figure 1-3 The homogenizing device 6 includes a motor 13, which is arranged on the bracket plate 3. A gear 14 is arranged at the output end of the motor 13. A rack column 15 runs through the bracket plate 3 and is always meshed with the gear 14. A limit seat 20 is arranged at the upper end of the top cover 4. The limit seat 20 can limit the up and down movement of the rack column 15. A connecting shaft 16 is arranged at the lower end of the rack column 15. An impeller 17 is arranged on the connecting shaft 16. The impeller 17 can turn the pulp at the bottom of the headbox 1 upward. A scraper 18 is arranged on the side of the connecting shaft 16. A wear-resistant layer 19 is arranged on the outer side of the scraper 18. The wear-resistant layer 19 is made of rubber material. The gear 14 meshes with the rack column 15 to rotate, thereby driving the impeller 17 to rotate. The impeller 17 can roll and homogenize the pulp in the headbox 1, and the scraper 18 can scrape and clean the side wall of the headbox 1.

[0025] During specific use, papermaking pulp is added to the headbox 1. When homogenization is required, the motor 13 is started, the gear 14 engages the rack column 15 to rotate, the rack column 15 drives the connecting shaft 16 to rotate, the impeller 17 rotates, and the pulp in the headbox 1 is rolled upward, so that the pulp can be mixed more evenly and the fiber precipitation can be avoided. At the same time, the wear-resistant layer 19 on the scraper 18 will perform rotational scraping and brushing on the inner wall of the headbox 1 to avoid the fiber adhering to the inner wall of the headbox 1, and the pulp in the headbox 1 can be discharged through the pulp discharge valve 2.

[0026] When it is necessary to open the top cover 4 or to clean the fallen leaves and the scraper 18 in the headbox 1 separately, by starting the motor 2 11, the gear 2 12 engages the ring gear 9 to rotate, the ring gear 9 drives the wire tube 8 to rotate, and the screw rod 10 does not rotate. The screw rod 10 drives the top cover 4 to move upward, and the rack column 15 slides on the gear 1 14 until the top cover 4 drives the impeller 17 and the scraper 18 to disengage from the headbox 1, so that the fibers on the impeller 17 and the scraper 18 can be cleaned, and the impeller 17 and the scraper 18 can be disassembled conveniently.

[0027] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A papermaking headbox, comprising a headbox, wherein a discharge valve is provided at the lower end of the headbox, characterized in that: A support plate is fixedly connected to the side wall of the headbox, the upper end of the headbox is covered with a top cover, the upper end of the top cover is provided with a guide rod, the guide rod passes through the support plate, a homogenizing device is provided on the support plate and can be inserted into the headbox, and a lifting drive device is provided on the support plate and is connected to the top cover.

2. A papermaking headbox according to claim 1, characterized in that: The lifting drive device includes a wire drum, which rotates in the bracket plate. The upper end of the wire drum is fixedly connected with a gear ring. The wire drum is internally threaded with a screw rod. The lower end of the screw rod is fixedly connected to the top cover. The bracket plate is provided with a second motor. The power output end of the second motor is provided with a second gear, and the second gear is meshed with the gear ring.

3. A papermaking headbox according to claim 2, characterized in that: The homogenizing device includes a motor 1, which is arranged on a bracket plate. A gear 1 is provided at the output end of the motor 1. A rack column runs through the bracket plate and is always meshed with the gear 1. A connecting shaft is provided at the lower end of the rack column, an impeller is provided on the connecting shaft, and a scraper is provided on the side of the connecting shaft.

4. A papermaking headbox according to claim 3, characterized in that: The outer side of the scraper is provided with a wear-resistant layer, and the wear-resistant layer is made of rubber material.

5. A papermaking headbox according to claim 4, characterized in that: A limit seat is provided at the upper end of the top cover, and the limit seat can limit the rack column from moving up and down.

6. A papermaking headbox according to claim 5, characterized in that: The headbox is provided with a window.

7. A papermaking headbox according to claim 6, characterized in that: The impeller can turn the pulp at the bottom of the headbox upward.

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