A dehumidification device for paper production

Abstract

The utility model discloses a dehumidifying device for paper production, comprising a long mesh conveyor belt, a wet pressing roller is arranged above the long mesh conveyor belt, and a pressing roller is arranged at the end of the long mesh conveyor belt, a plurality of drying rollers which are staggered up and down are arranged on the side of the pressing roller away from the long mesh conveyor belt, an exhaust hood is arranged above the plurality of drying rollers, an annular air extractor is arranged below the exhaust hood, the annular air extractor is arranged directly opposite to the drying roller located at the lower side, and is connected to the exhaust pipe of the exhaust hood through a pipeline; the utility model provides an exhaust hood, which can extract and discharge the water mist located above the paper under the action of an axial flow fan, and an annular air extractor is arranged below the exhaust hood, so as to extract and discharge the water mist located below the paper, so as to avoid the water mist scattering due to the paper blocking the rising channel of the water mist, and at the same time avoid affecting the sight of the staff and the cement turning into liquid when it is cooled and entering the paper again.

Description

Technical Field

[0001] The utility model relates to the technical field of paper dehumidification, in particular to a dehumidification device for paper production. Background Art

[0002] In the industrial production of paper, a fourdrinier papermaking machine is required to complete the continuous production of paper to meet the market demand. The fourdrinier papermaking machine consists of a wet section (including a headbox, a former, and a press section) and a dry section (drying, calendering, and winding). Specifically, the former mainly includes a conveyor belt made of fine nylon mesh paper. The pulp moves with the conveyor belt. When it moves to the wet press roller, the pulp solidifies under the action of the wet press roller. The solidified pulp is drained of moisture again through the action of the press roller. Finally, it is dried when it enters the drying roller to reduce the humidity of the paper.

[0003] When paper is dried, water evaporates to form mist, which needs to be discharged in time, otherwise the mist will float around the factory, affecting the sight of the staff, and the mist will condense into water droplets and fall into the paper again, causing the humidity of the dehumidified paper to increase again. At present, there are many devices for discharging water mist, including a Chinese patent with patent publication number CN219470555U that discloses a dehumidifier for paper production, which includes an air hood and an exhaust fan. The air hood is arranged above the mesh part, and an air inlet and an exhaust port are arranged on the air hood, and the air inlet is located directly above the mesh part; the exhaust fan is arranged in the air hood to allow water vapor to enter the air hood from the air inlet and be discharged from the exhaust port.

[0004] When the device provided by the above patent is used to pump water mist, it is more suitable for horizontally moving and drying equipment, but not so suitable for a drying section composed of multiple drying rollers distributed up and down, because the drying rollers are distributed up and down, so the paper will also be in a curved moving state, and the water mist emitted from the part of the paper below the drying roller will be blocked by the paper in the rising channel. In addition, the power of the axial flow fan cannot be increased because the strong wind force can easily cause damage to the paper. Therefore, the water mist below will scatter and the pumping effect is poor. Utility Model Content

[0005] The utility model aims to provide a dehumidification device for paper production, aiming to improve the problem that the air extraction device used in the drying section of a Fourdrinier papermaking machine cannot effectively extract water mist.

[0006] The utility model is implemented as follows: a dehumidification device for paper production, including a long mesh conveyor belt, a wet pressing roller is arranged above the long mesh conveyor belt, and a pressing roller is arranged at the end of the long mesh conveyor belt, a plurality of drying rollers that are staggered up and down are arranged on the side of the pressing roller away from the long mesh conveyor belt, an exhaust hood is arranged above the plurality of drying rollers, an annular vacuum pump is arranged below the exhaust hood, the annular vacuum pump is arranged opposite to the drying roller located at the lower side, and is connected to the exhaust pipe of the exhaust hood through a pipeline.

[0007] Preferably, the annular vacuum pump comprises a first vacuum arc plate and a second vacuum arc plate which are spliced ​​and connected to each other, and vacuum cavities are arranged on the sides of the first vacuum arc plate and the second vacuum arc plate, and the two vacuum cavities are connected to each other.

[0008] Preferably, a slot is provided at the end of the first exhaust arc plate, and an insert plate is provided at the end of the second exhaust arc plate, and the insert plate is connected by bolts and inserted into the slot; a connecting plate is provided above the second exhaust arc plate, and the connecting plate is connected to the exhaust hood.

[0009] Preferably, the outer diameter of the annular air extractor formed by splicing the first air extraction arc plate and the second air extraction arc plate is larger than the diameter of the drying roller.

[0010] Preferably, an end sleeve is provided at the end of the wet pressing roller, a limiting rod and a threaded rod are penetrated through the end sleeve, and the bottoms of the threaded rod and the limiting rod are connected to a bottom plate.

[0011] Preferably, a polygonal groove is provided on the top surface of the threaded rod, a polygonal column is inserted into the polygonal groove, and a turntable is fixedly provided on the top of the polygonal column; a snap plate is provided below the bottom plate, the snap plate is located in the snap groove of the crossbeam of the long mesh conveyor belt, and the cross-sections of the snap plate and the snap groove are both set to be convex structures.

[0012] Preferably, the centers of the two pressing rollers are offset, and a first vertical plate and a second vertical plate are respectively provided at the ends of the upper and lower pressing rollers. The first vertical plate is provided as an L-shaped structure, an adjusting screw is provided through the vertical section of the first vertical plate, a sliding slot is provided in the horizontal section, a threaded hole and an arc-shaped groove are provided on the second vertical plate, a cross-section formed by the lower end of the second vertical plate and the arc-shaped groove is the same as the cross-section of the sliding slot and is located in the sliding slot, and the end thread of the adjusting screw is provided through the threaded hole.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model is provided with an exhaust hood, which can exhaust the water mist above the paper through the action of an axial flow fan, and an annular vacuum pump is provided below the exhaust hood, so that it faces the drying roller to extract the water mist below the paper and discharge it, thereby avoiding the water mist from scattering due to the paper blocking the rising channel of the water mist, and at the same time avoiding affecting the sight of the staff and the cement from turning into liquid when it is cooled and entering the paper again. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a simplified schematic diagram of a Fourdrinier paper machine;

[0015] Figure 2 It is a structural schematic diagram of the exhaust hood of the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the first air extraction arc plate and the second air extraction arc plate of the utility model;

[0017] Figure 4 It is a structural schematic diagram of the solidification roller of the utility model;

[0018] Figure 5 It is a structural schematic diagram of the threaded rod, the limiting rod and the bottom plate of the utility model;

[0019] Figure 6 It is a structural schematic diagram of the pressing roller of the utility model;

[0020] Figure 7 It is a structural schematic diagram of the vertical plate of the utility model.

[0021] In the figure: 1. long mesh conveyor belt; 2. wet pressing roller; 21. end sleeve; 22. threaded rod; 23. limiting rod; 24. polygonal groove; 25. turntable; 26. bottom plate; 27. snap plate; 3. pressing roller; 31. first vertical plate; 32. second vertical plate; 33. adjusting screw; 34. sliding slot; 35. threaded hole; 36. arc groove; 4. drying roller; 41. drying air pipe; 5. exhaust hood; 51. exhaust pipe; 52. first exhaust arc plate; 53. second exhaust arc plate; 54. exhaust cavity; 55. slot; 56. plug plate; 57. connecting plate. DETAILED DESCRIPTION

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between 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.

[0023] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0024] Example 1

[0025] like Figure 1As shown, a dehumidification device for paper production includes a fourdrinier conveyor belt 1, a wet pressing roller 2, a pressing roller 3 and a drying roller 4. The fourdrinier conveyor belt 1 is arranged at the end of a fourdrinier papermaking machine, and its supporting roller is connected to a motor. The fourdrinier conveyor belt 1 is controlled to rotate by the operation of the motor, so that the pulp output from the pulp box and falling on the end of the fourdrinier conveyor belt 1 is moved to the other end. In the process of the paper moving with the fourdrinier conveyor belt 1, the wet pressing roller 2 located at the other end of the fourdrinier conveyor belt 1 rotates synchronously and squeezes the paper for the first time to dehydrate it to form paper. The formed paper continues to move to the pressing roller 3 located on the outer side of the end of the fourdrinier conveyor belt 1. The pressing roller 3 is arranged on the fourdrinier papermaking machine, and Also connected to the motor, two pressing rollers 3 distributed up and down squeeze the paper against each other to dehydrate it again. After dehydration again, the paper enters a drying area formed by multiple drying rollers 4. The drying rollers 4 (also called steam cylinders) are connected to the steam production mechanism of the fourdrinier papermaking machine. The temperature of the drying rollers 4 is increased by the steam entering and exiting the drying rollers 4, thereby heating the paper and evaporating the moisture in the paper. In order to improve the evaporation efficiency, five drying rollers 4 are arranged. The five drying rollers 4 are staggered up and down to make the paper bend and move, thereby increasing the contact time between the paper and the drying rollers 4. In addition, the drying rollers 4 are provided with drying air pipes 41, through which the steam enters and exits.

[0026] like Figure 2 , Figure 3As shown, in order to timely and effectively discharge the water mist generated at the drying rollers 4, an exhaust hood 5 is provided above the multiple drying rollers 4. The exhaust hood 5 is installed on the fourdrier papermaking machine, and an exhaust pipe 51 is provided above it. An axial flow fan is provided at the end of the exhaust pipe 51, and the gas is controlled by the axial flow fan to flow from the bottom of the exhaust hood 5 to the top. In addition, an annular vacuum pump is provided below the exhaust hood 5. The annular vacuum pump includes a first vacuum arc plate 52 and a second vacuum arc plate 53. The sides of the first vacuum arc plate 52 and the second vacuum arc plate 53 are both provided with a vacuum chamber 54. A slot 55 is provided at the end of the first vacuum arc plate 52. A plug plate 56 is provided at the end of the second vacuum arc plate 53. The plug plate 56 is connected by bolts and inserted into the slot 55. The outer diameter of the annular vacuum pump formed by splicing the first vacuum arc plate 52 and the second vacuum arc plate 53 is larger than the diameter of the drying roller 4 and is arranged directly opposite to the drying roller 4 located at the lower side. A connecting plate 57 is provided above the second vacuum arc plate 53 and is connected to the exhaust pipe 51 through a pipeline. When the axial flow fan is working to pump water mist, it simultaneously stirs the gas flow inside and outside the annular vacuum pump, thereby driving the water mist located below the paper, avoiding the water mist from scattering due to the paper blocking the channel for the water mist to rise, and avoiding affecting the sight of the staff and the cement from entering the paper again when it is cooled and turned into liquid. With the cooperation of the plug plate 56 and the slot 55, the first exhaust arc plate 52 and the second exhaust arc plate 53 are detachably connected, thus providing convenience for installing the device at the end of the drying roller 4. A condensation structure can also be provided on the exhaust hood 5 according to needs to condense water vapor and discharge it. The specific condensation structure can be improved by installing the condensation structure recorded in the Chinese patent with patent publication number CN219470555U on the exhaust hood 5.

[0027] Example 2

[0028] like Figure 1As shown, a dehumidification device for paper production includes a fourdrinier conveyor belt 1, a wet pressing roller 2, a pressing roller 3 and a drying roller 4. The fourdrinier conveyor belt 1 is arranged at the end of a fourdrinier papermaking machine, and its supporting roller is connected to a motor. The fourdrinier conveyor belt 1 is controlled to rotate by the operation of the motor, so that the pulp output from the pulp box and falling on the end of the fourdrinier conveyor belt 1 is moved to the other end. In the process of the paper moving with the fourdrinier conveyor belt 1, the wet pressing roller 2 located at the other end of the fourdrinier conveyor belt 1 rotates synchronously and squeezes the paper for the first time to dehydrate it to form paper. The formed paper continues to move to the pressing roller 3 located on the outer side of the end of the fourdrinier conveyor belt 1. The pressing roller 3 is arranged on the fourdrinier papermaking machine, and Also connected to the motor, two pressing rollers 3 distributed up and down squeeze the paper against each other to dehydrate it again. After dehydration again, the paper enters a drying area formed by multiple drying rollers 4. The drying rollers 4 (also called steam cylinders) are connected to the steam production mechanism of the fourdrinier papermaking machine. The temperature of the drying rollers 4 is increased by the steam entering and exiting the drying rollers 4, thereby heating the paper and evaporating the moisture in the paper. In order to improve the evaporation efficiency, five drying rollers 4 are arranged. The five drying rollers 4 are staggered up and down to make the paper bend and move, thereby increasing the contact time between the paper and the drying rollers 4. In addition, the drying rollers 4 are provided with drying air pipes 41, through which the steam enters and exits.

[0029] like Figure 2 , Figure 3As shown, in order to timely and effectively discharge the water mist generated at the drying rollers 4, an exhaust hood 5 is provided above the multiple drying rollers 4. The exhaust hood 5 is installed on the fourdrier papermaking machine, and an exhaust pipe 51 is provided above it. An axial flow fan is provided at the end of the exhaust pipe 51, and the gas is controlled by the axial flow fan to flow from the bottom of the exhaust hood 5 to the top. In addition, an annular vacuum pump is provided below the exhaust hood 5. The annular vacuum pump includes a first vacuum arc plate 52 and a second vacuum arc plate 53. The sides of the first vacuum arc plate 52 and the second vacuum arc plate 53 are both provided with a vacuum chamber 54. A slot 55 is provided at the end of the first vacuum arc plate 52. A plug plate 56 is provided at the end of the second vacuum arc plate 53. The plug plate 56 is connected by bolts and inserted into the slot 55. The outer diameter of the annular vacuum pump formed by splicing the first vacuum arc plate 52 and the second vacuum arc plate 53 is larger than the diameter of the drying roller 4 and is arranged directly opposite to the drying roller 4 located at the lower side. A connecting plate 57 is provided above the second vacuum arc plate 53 and is connected to the exhaust pipe 51 through a pipeline. When the axial flow fan is working to pump water mist, it simultaneously stirs the gas flow inside and outside the annular vacuum pump, thereby driving the water mist located below the paper, avoiding the water mist from scattering due to the paper blocking the channel for the water mist to rise, and avoiding affecting the sight of the staff and the cement from entering the paper again when it is cooled and turned into liquid. With the cooperation of the plug plate 56 and the slot 55, the first exhaust arc plate 52 and the second exhaust arc plate 53 are detachably connected, thus providing convenience for installing the device at the end of the drying roller 4. A condensation structure can also be provided on the exhaust hood 5 according to needs to condense water vapor and discharge it. The specific condensation structure can be improved by installing the condensation structure recorded in the Chinese patent with patent publication number CN219470555U on the exhaust hood 5.

[0030] like Figure 4 , Figure 5 As shown, in order for the wet pressing roller 2 to achieve the initial squeezing of the pulp, an end sleeve 21 is provided at the end of the wet pressing roller 2, a limiting rod 23 and a threaded rod 22 are provided through the end sleeve 21, the bottom of the threaded rod 22 and the limiting rod 23 are connected to a bottom plate 26, a snap plate 27 is provided below the bottom plate 26, the snap plate 27 is located in the snap groove of the cross beam of the long mesh conveyor belt 1, and the cross sections of the snap plate 27 and the snap groove are both set as convex structures. With the cooperation of the threaded rod 22 and the limiting rod 23, the end sleeve 21 controls the stable lifting and lowering of the wet pressing roller 2, and the position of the wet pressing roller 2 can be adjusted by rotating the threaded rod 22, so as to squeeze the pulp according to the needs to make paper of different thicknesses. A polygonal groove 24 is provided on the top surface of the threaded rod 22, a polygonal column is inserted at the polygonal groove 24, and a rotating disk 25 is fixedly provided on the top of the polygonal column. This arrangement can facilitate the end sleeve 21 to be sleeved on the limiting rod 23 and the threaded rod 22.

[0031] like Figure 6 , Figure 7As shown, the centers of the two pressing rollers 3 are offset, and a first vertical plate 31 and a second vertical plate 32 are respectively provided at the ends of the upper and lower pressing rollers 3. The first vertical plate 31 is set as an L-shaped structure. The vertical section of the first vertical plate 31 is penetrated by an adjusting screw 33, and the horizontal section is provided with a sliding groove 34. The second vertical plate 32 is provided with a threaded hole 35 and an arc-shaped groove 36. The cross-section formed by the lower end of the second vertical plate 32 and the arc-shaped groove 36 is the same as the cross-section of the sliding groove 34 and is located in the sliding groove 34. The end thread of the adjusting screw 33 is penetrated by the threaded hole 35. By rotating the adjusting screw 33, the relative movement of the first vertical plate 31 and the second vertical plate 32 can be controlled, thereby adjusting the positions of the two pressing rollers 3 to provide support for squeezing the paper again to discharge water.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. 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 dehumidification device for paper production, characterized in that: The invention comprises a long mesh conveyor belt (1), a wet pressing roller (2) is arranged above the long mesh conveyor belt (1), and a pressing roller (3) is arranged at the end of the long mesh conveyor belt (1), a plurality of drying rollers (4) which are staggered in the upper and lower directions are arranged on the side of the pressing roller (3) away from the long mesh conveyor belt (1), an exhaust hood (5) is arranged above the plurality of drying rollers (4), and an annular vacuum pump is arranged below the exhaust hood (5), the annular vacuum pump is arranged opposite to the drying roller (4) located at the lower side, and is connected to the exhaust pipe (51) of the exhaust hood (5) through a pipeline.

2. A dehumidification device for paper production according to claim 1, characterized in that: The annular air extractor comprises a first air extraction arc plate (52) and a second air extraction arc plate (53) which are spliced ​​and connected to each other. The sides of the first air extraction arc plate (52) and the second air extraction arc plate (53) are both provided with air extraction cavities (54), and the two air extraction cavities (54) are connected to each other.

3. A dehumidification device for paper production according to claim 2, characterized in that: A slot (55) is provided at the end of the first exhaust arc plate (52), and an inserting plate (56) is provided at the end of the second exhaust arc plate (53), and the inserting plate (56) is inserted into the slot (55) by means of bolts; a connecting plate (57) is provided above the second exhaust arc plate (53), and the connecting plate (57) is connected to the exhaust hood (5).

4. A dehumidification device for paper production according to claim 3, characterized in that: The outer diameter of the annular air extractor formed by splicing the first air extraction arc plate (52) and the second air extraction arc plate (53) is greater than the diameter of the drying roller (4).

5. A dehumidification device for paper production according to claim 1, characterized in that: An end sleeve (21) is provided at the end of the wet pressing roller (2), a limiting rod (23) and a threaded rod (22) are provided through the end sleeve (21), and the bottoms of the threaded rod (22) and the limiting rod (23) are connected to a bottom plate (26).

6. A dehumidification device for paper production according to claim 5, characterized in that: A polygonal groove (24) is provided on the top surface of the threaded rod (22), a polygonal column is inserted into the polygonal groove (24), and a rotating disk (25) is fixedly provided on the top of the polygonal column; a snap plate (27) is provided below the bottom plate (26), the snap plate (27) is located in the snap groove of the cross beam of the long net conveyor belt (1), and the cross sections of the snap plate (27) and the snap groove are both arranged to be convex structures.

7. A dehumidification device for paper production according to claim 1, characterized in that: The centers of the two pressing rollers (3) are offset, and a first vertical plate (31) and a second vertical plate (32) are respectively arranged at the ends of the upper and lower pressing rollers (3), the first vertical plate (31) being arranged in an L-shaped structure, an adjusting screw (33) being arranged through the vertical section of the first vertical plate (31), and a sliding groove (34) being arranged through the horizontal section, a threaded hole (35) and an arc-shaped groove (36) being arranged on the second vertical plate (32), the cross section formed by the lower end of the second vertical plate (32) and the arc-shaped groove (36) being the same as the cross section of the sliding groove (34), and being located in the sliding groove (34), and the end thread of the adjusting screw (33) being arranged through the threaded hole (35).

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