A sizing device for papermaking and its sizing method

Abstract

The present application discloses a finishing device for papermaking and a finishing method thereof, including a mounting frame, a finishing roller, a finishing screen and a water absorption device. The finishing screen is fixed on the working surface of the finishing roller, and a number of water absorption holes are also provided on the finishing roller. The water absorption device is arranged on the mounting frame and is connected to the inner cavity of the finishing roller to create a local vacuum therein. During use, the finishing roller rotates driven by an external paper output cage, and the finishing screen is pushed by its own gravity to squeeze the paper to complete finishing, absorb and accumulate the extruded water, and finally the accumulated water is pumped out through the water absorption device to control the water content of the finishing screen. The present invention effectively controls the water flow direction through the cooperation of the finishing screen and the water absorption device, fundamentally solves the problem of water backflow during the finishing process of small mesh, realizes the application of small mesh finishing screen in the paper finishing process, and thus greatly improves the evenness of the paper.

Description

Technical Field

[0001] The present application relates to the technical field of banknote printing equipment, and particularly relates to a finishing device for paper making and a finishing method thereof. Background Art

[0002] In the process of making anti-counterfeiting paper, a material with a certain mesh is used to deposit pulp fibers to form a paper sheet, and then a finishing device is used to extrude and form the paper sheet formed by the deposited pulp fibers. During the extrusion process, excess moisture is removed, and at the same time, the uniformity of the paper is improved through extrusion; in the prior art, a stainless steel mesh roll is generally used for extrusion finishing, but the mesh holes of the stainless steel mesh roll are relatively large, resulting in poor uniformity of the paper and unsatisfactory finishing effect. Summary of the Invention

[0003] The main purpose of the present application is to provide a finishing device for paper making and a finishing method thereof, aiming to solve the defect of poor uniformity of paper existing in the prior art.

[0004] To achieve the above purpose, the present application provides a finishing device for paper making, including a mounting frame;

[0005] A finishing roll, the finishing roll is rotatably arranged on the mounting frame, and a plurality of water absorption holes are further arranged on the working surface of the finishing roll;

[0006] A finishing net, the finishing net is fixed to the working surface of the finishing roll; the finishing net is used to finish the paper and adsorb the water extruded from the paper during the process of the finishing roll extruding the paper;

[0007] A water absorption device, the water absorption device forms a negative pressure in the finishing roll to suck the water in the finishing net through the water absorption holes.

[0008] Optionally, a connecting shaft is arranged on the mounting frame, the finishing roll is rotationally connected to the connecting shaft, and the water absorption device is fixed to the connecting shaft.

[0009] Optionally, the water absorption device includes a negative pressure box fixed to the connecting shaft, and an air inlet is arranged on the negative pressure box; the air inlet is sequentially communicated with a plurality of the water absorption ports during the rotation of the finishing roll.

[0010] Optionally, the negative pressure box is of an annular structure, and along the radial direction of the negative pressure box, two partition plates are arranged in the negative pressure box, and a negative pressure adsorption area is divided in the negative pressure box by the two partition plates arranged along the axial direction of the negative pressure box; and along the air flow direction, the through-flow area of the negative pressure adsorption area increases linearly.

[0011] Optionally, the negative pressure box is of an arc-shaped box structure, and along the air flow direction, the through-flow area of the negative pressure box increases linearly.

[0012] Optionally, an exhaust cavity is further provided on the connecting shaft, and the exhaust cavity communicates with the negative pressure box.

[0013] Optionally, the finishing net is a three-layer polyester net or a two-and-a-half-layer polyester net, and the mesh number of the finishing net is 60-90 meshes.

[0014] Optionally, the mounting frame is also hinged with a swing arm through a rotating shaft, the connecting shaft is connected to one end of the swing arm, and a balance weight is arranged at the other end of the swing arm.

[0015] Optionally, a shock absorption device is further arranged on the swing arm.

[0016] Correspondingly, the present invention discloses a finishing method based on the above-mentioned finishing device, including the following steps:

[0017] The finishing roller drives the finishing net to rotate synchronously, and pushes the finishing net to squeeze and finish the paper to be finished attached to the papermaking wire cage; the finishing net adsorbs the moisture discharged by the paper to be finished during the squeezing and finishing process.

[0018] The finishing net that has completed the finishing operation and adsorbed moisture continues to rotate driven by the finishing roller, and the water absorption device sucks the moisture adsorbed in the finishing net through the water absorption holes.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention includes a mounting frame, a finishing roller, a finishing net and a water absorption device, wherein the finishing net is fixed on the working surface of the finishing roller, and a plurality of water absorption holes are further arranged on the finishing roller; the water absorption device is arranged on the mounting frame and is connected to the internal cavity of the finishing roller to create a local vacuum therein.

[0021] When the present invention is used, the whole set of equipment is installed on the frame of an external device, and at the same time, the finishing roller is placed on the wire cage for outputting the paper to be finished. Due to the action of the self-gravity of the finishing roller, the finishing net on the surface of the finishing roller will be closely attached to the surface of the paper to be finished, and form a certain extrusion force on the paper to be finished; the wire cage rotates driven by a power device, and drives the finishing roller to rotate, so as to realize the continuous progress of the finishing process and continuously output the finished paper.

[0022] During the above finishing process, the finishing net squeezes the paper to be finished, and the moisture in the paper to be finished is squeezed out. Part of the moisture is absorbed and temporarily stored by the finishing net. At this time, a local vacuum is formed in the finishing roller through the water absorption device. Due to the water absorption holes, air convection will be formed between the inside and outside of the finishing roller under the action of negative pressure. When the air enters the inside of the finishing roller, it will impact the finishing net, thereby taking away the moisture stored in the finishing net and finally discharging it, so as to reduce the moisture content in the finishing net and realize the water absorption and drainage cycle during the rotation of the finishing net, ensure that the squeezed moisture can be discharged in time, and reduce the moisture content of the paper;

[0023] In the prior art, generally a wire mesh is coated on the outer surface of the finishing roller, and the finishing of the paper is realized through the extrusion of the wire mesh. In order to ensure the timely discharge of moisture during the finishing process and avoid too high moisture content of the paper, which affects the quality of the paper, it is required that the pores of the wire mesh cannot be too small, which results in poor formation of the paper;

[0024] Compared with it, the present application uses a finishing net for finishing. Its pores are smaller than those of the wire mesh, and the mesh distribution is more dense. Therefore, it can effectively improve the formation of the paper; at the same time, the high-density mesh can effectively reduce the extrusion blind area, which is beneficial to reducing the moisture content of the paper; however, too small mesh will lead to the problem of poor drainage. Therefore, in view of the above defects, the finishing net of the present invention also needs to absorb and temporarily store the extruded moisture during the finishing process, and bring the moisture into the area where the subsequent water absorption device is located, and then discharge the moisture through vacuum adsorption; thereby controlling the flow direction of the moisture, avoiding the backflow of moisture into the paper due to poor drainage, and fundamentally solving the problems of poor drainage and high moisture content of the paper caused by the change of the mesh, realizing the finishing of the paper with a small-mesh finishing net, and greatly improving the formation of the paper; at the same time, by absorbing water through the finishing net, the flow rate of the extruded moisture can also be adjusted, avoiding drastic changes in the water volume, and improving the stability of the equipment operation;

[0025] During the process of vacuum adsorption and drainage, the moisture is stored on the finishing net. Compared with the traditional vacuum adsorption technology, in the technical solution of the present invention, the air flowing under the action of negative pressure will take the moisture away from the finishing net, rather than directly taking the moisture away from the air or the paper. That is, the present invention isolates the negative pressure source and the paper through the finishing net, so that the finishing net plays a certain buffering role, avoiding the direct extraction of moisture from the paper by the negative pressure air, and minimizing the damage to the wet paper caused by the high-speed flowing air, which is beneficial to improving the quality of the paper; at the same time, due to the water storage effect of the finishing net, the moisture will be evenly distributed throughout the finishing net under the action of capillary action. Therefore, only by ensuring the stability of the vacuum environment can the moisture be discharged at a relatively stable speed, thereby realizing the effective control of the drainage speed, and further improving the stability of the operation of the entire set of equipment, and thus improving the formation of the paper.

[0026] Therefore, by combining the finishing and water absorption functions of the finishing mesh with the vacuum pumping of the water absorption device, the present invention breaks the strict requirements for the mesh number of the wire mesh in the prior art, realizes the finishing of the large-mesh fabric, and improves the evenness of the paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 1 is a schematic structural diagram of a finishing device for papermaking according to Embodiment 1 of the present application;

[0028] Figure 2 FIG. 2 is a schematic assembly structure diagram of the finishing mesh and the finishing roller of the finishing device for papermaking according to the present invention;

[0029] Figure 3 FIG. 3 is a schematic assembly structure diagram of the finishing mesh, the finishing roller, the negative pressure box and the connecting shaft of the present invention;

[0030] Figure 4 FIG. 4 is an exploded view of the finishing mesh, the finishing roller, the negative pressure box and the connecting shaft of the present invention;

[0031] Figure 5 FIG. 5 is a schematic structural diagram of the negative pressure box of the present invention;

[0032] Figure 6 FIG. 6 is a cross-sectional view of the negative pressure box of the present invention;

[0033] Figure 7 FIG. 7 is a schematic assembly structure diagram of the finishing mesh, the finishing roller, the negative pressure box and the connecting shaft of the present invention;

[0034] Figure 8 FIG. 8 is a schematic connection diagram of the working state of the present invention;

[0035] Figure 9 FIG. 9 is a top view structural diagram of the negative pressure box of a finishing device for papermaking provided by Embodiment 2 of the present invention;

[0036] Figure 10 FIG. 10 is a schematic structural diagram of the negative pressure box of a finishing device for papermaking according to Embodiment 3 of the present invention;

[0037] Figure 11 FIG. 11 is a flowchart of the finishing method of the present invention;

[0038] Reference numerals: 1 - mounting frame, 2 - finishing roller, 3 - finishing mesh, 4 - connecting shaft, 5 - negative pressure box, 6 - mounting surface, 7 - air inlet surface, 8 - rotating shaft, 9 - swing arm, 10 - balance weight, 11 - damping device, 21 - water absorption hole, 41 - exhaust cavity, 51 - air inlet, 52 - air outlet, 53 - partition board.

[0039] The realization of the purpose, the functional characteristics and the advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0042] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0044] Embodiment 1

[0045] Refer to Figure 1 and Figure 2, this embodiment discloses a finishing device for papermaking, including an installation frame 1, a finishing roller 2 and a water absorption device. The installation frame 1 includes two symmetrically arranged mounting seats. During installation, the two mounting seats are respectively arranged on both sides of the machine frame. The middle parts of the two mounting seats are rotatably connected by a rotating shaft 8 through rolling bearings. A swing arm 9 is fixedly arranged on the rotating shaft 8. One end of the swing arm 9 is fixedly provided with a balance weight 10, and the other side of the swing arm is fixedly provided with a connecting shaft 4. The connecting shaft 4 is rotatably connected with the finishing roller 2 through a rolling bearing. At the same time, vibration damping devices 11 are arranged on both sides of the mounting seat. According to needs, the vibration damping device can be selected from devices such as springs or buffer cylinders. During installation, one end of the vibration damping device is connected to the mounting seat, and the other end is connected to external equipment;

[0046] The finishing roller 2 is a roller with a circular cross-section. Its two ends are open structures and are respectively rotatably connected to the connecting shaft through rolling bearings. The outer surface of the finishing roller 2 is the working surface, and a finishing mesh 3 is also fixedly arranged on the working surface of the finishing roller 2. Around the axis of the finishing roller 2, the finishing mesh 3 covers the entire outer surface of the finishing roller 2;

[0047] At the same time, a number of water absorption holes 21 are also arranged on the working surface of the finishing roller 2. According to needs, the water absorption holes 21 are all in several groups. The water absorption holes 21 in the same group are evenly arranged on its surface around the axis of the finishing roller 2, and the water absorption holes 21 in the same group are evenly arranged along the axis direction of the finishing roller 2; The water absorption holes 21 in each group are evenly arranged along the circumferential direction of the finishing roller 2, so as to ensure that the water absorption holes 21 are evenly distributed on the entire surface of the finishing roller 2;

[0048] At the same time, a spiral line around the axis of the finishing roller can also be set, and the water absorption holes 21 are evenly arranged on the spiral line, so as to ensure that the water absorption holes 21 are evenly distributed on the entire surface of the finishing roller 2;

[0049] According to needs, the finishing mesh 3 is selected from a three-layer polyester mesh or a two-and-a-half-layer polyester mesh, and at the same time, the mesh number of the finishing mesh 3 is 60-90 meshes;

[0050] The water absorption device includes an exhaust cavity 41 arranged in the middle along the axial direction of the connecting shaft 4. One end of the exhaust cavity 41 is communicated with the outside through the end face of the connecting shaft, and this end is used to connect external equipment such as a vacuum pump or a vacuum pipeline. A number of ventilation holes are evenly arranged in the circumferential direction of the connecting shaft 4. Through the ventilation holes, the exhaust cavity 41 is communicated with the internal space of the finishing roller 2, so as to form a negative pressure inside the finishing roller 2, so as to drive external air to pass through the finishing mesh 3 and take away moisture through the water absorption holes 21 and finally discharge it, realizing the dehydration operation of the finishing mesh 3.

[0051] Embodiment 2

[0052] Refer to Figures 2 to 8, on the basis of Embodiment 1, this embodiment discloses a finishing device for papermaking, including a mounting frame 1, a finishing roller 2 and a water absorption device. The mounting frame 1 includes two symmetrically arranged mounting seats. During installation, the two mounting seats are respectively arranged on both sides of the machine frame. A rotating shaft 8 is rotatably connected to the middle parts of the two mounting seats through rolling bearings. A swing arm 9 is fixedly arranged on the rotating shaft 8. A balance weight 10 is fixedly arranged on one side of the swing arm 9. A connecting shaft 4 is fixedly arranged on the other side of the swing arm 9. The connecting shaft 4 is rotatably connected to the finishing roller 2 through a rolling bearing;

[0053] At the same time, as Figure 9 shown, there are two swing arms 9 in total, which are symmetrically distributed at both ends of the connecting shaft 8; the middle part of the swing arm 9 is fixedly connected to the rotating shaft 8, one end of it is provided with a balance weight 10, and the two balance weights 10 are respectively threadedly connected to the swing arm; so as to achieve different balance effects by adjusting the position of the balance weight 10; the other end is connected through a connecting shaft 4, and the connecting shaft 4 is rotatably connected to the finishing roller 2 through a rolling bearing;

[0054] At the same time, a vibration damping device 11 is also arranged on the swing arm. According to needs, the vibration damping device can be a spring or a buffer cylinder and other devices. During installation, one end of the vibration damping device is fixedly connected to the swing arm 9, and the other end is connected to external equipment;

[0055] In the above structure, the finishing roller and the balance weight are respectively arranged on both sides of the swing arm. The balance weight 10 offsets part of the extrusion force exerted by the finishing roller on the paper to be leveled, so as to effectively adjust the extrusion force of the finishing roller 2, ensure that the paper is compacted, reduce the water content of the paper, and improve the finishing quality; on the other hand, the buffer effect of the vibration damping device 11 reduces the fluctuation range of the extrusion force of the finishing roller 2, so as to ensure the stable operation of the finishing process, avoid the drastic fluctuation of the paper thickness caused by the drastic fluctuation of the extrusion force, and improve the quality of the paper; at the same time, under the action of external force, when the finishing roller 2 suddenly fluctuates greatly and disengages from the external papermaking wire cage, the vibration damping device 11 can assist the finishing roller 2 to quickly reset, so as to ensure the stable operation of the whole set of equipment.

[0056] The finishing roller 2 is a roller with a circular cross-section, and its two ends are open structures and are respectively rotatably connected to the connecting shaft through rolling bearings. The outer surface of the finishing roller 2 is the working surface, and a finishing net 3 is also fixedly arranged on the working surface of the finishing roller 2. Around the axis of the finishing roller 2, the finishing net 3 covers the entire outer surface of the finishing roller 2;

[0057] Meanwhile, a number of water absorption holes 21 are also provided on the working surface of the finishing roller 2. As required, the water absorption holes 21 are all in several groups. The water absorption holes 21 in the same group are evenly arranged on its surface around the axis of the finishing roller 2, and the water absorption holes 21 in the same group are evenly arranged along the axis direction of the finishing roller 2; the water absorption holes 21 in each group are evenly arranged along the circumferential direction of the finishing roller 2, so as to ensure that the water absorption holes 21 are evenly distributed on the entire surface of the finishing roller 2;

[0058] Meanwhile, a spiral line around the axis of the finishing roller can also be set, and the water absorption holes 21 are evenly arranged on the spiral line, so as to ensure that the water absorption holes 21 are evenly distributed on the entire surface of the finishing roller 2;

[0059] As required, the finishing screen 3 is selected as a three-layer polyester screen or a two-and-a-half-layer polyester screen. Meanwhile, the mesh number of the finishing screen 3 is 60-90 meshes, and the preferred mesh number is 80 meshes;

[0060] Selecting a three-layer polyester screen or a two-and-a-half-layer polyester screen as the finishing screen, on the one hand, its wide source can effectively reduce the cost of the whole set of equipment; secondly, the polyester screen has a certain water absorption property, but its water absorption principle is only water adhesion. Therefore, compared with sponges, cotton cloths, etc., the adhesion of water is limited. Therefore, most of the water can be smoothly taken away by high-speed flowing air to achieve rapid dehydration;

[0061] Compared with traditional finishing equipment such as wire meshes, the polyester screen not only has better flexibility, but also has no sharp burrs, which can effectively avoid pressing the paper; at the same time, its holes are smaller, which can effectively improve the extrusion effect of water and improve the finishing quality of the paper.

[0062] The water absorption device includes a negative pressure box 5. As required, the negative pressure box 5 is of an annular structure. Along the axial direction of the negative pressure box 5, the inner side of the negative pressure box 5 is an installation surface 6, and the outer side is an air inlet surface 7. During installation, the installation surface 6 of the negative pressure box 5 is fixedly attached to the outer surface of the connecting shaft 4, and the air inlet surface 7 of the negative pressure box 5 is directly opposite to the inner side surface of the finishing roller 2. Meanwhile, two partition plates 53 arranged in different radial directions of the connecting shaft 4 are also provided in the negative pressure box 5. The internal space of the negative pressure box 5 is divided into a mutually separated negative pressure adsorption area and a natural area by the two partition plates 53; along the air flow direction, the two partition plates are arranged in an inverted V shape, so as to ensure that along the air flow direction, the flow area of the negative pressure adsorption area increases linearly; through the above structural settings, the adsorption pressure at the air inlet can be effectively improved, and thus the dehydration effect can be improved;

[0063] At the same time, an air suction chamber 41 is also provided on the connecting shaft 4, and the air suction chamber 41 is arranged along the axial direction of the connecting shaft 4, and one end thereof passes through the end face of the connecting shaft 4 and is connected to an external negative pressure device, and the external negative pressure device is a vacuum pump or an existing vacuum pipeline in the factory area; at the same time, a plurality of air suction holes are also provided in the radial direction of the connecting shaft 4, and the air suction chamber 41 is connected to the vacuum area in the negative pressure box 5 through the air suction holes; at the same time, an air inlet 51 is also provided on the top of the negative pressure box 5, and the air inlet 51 is an arc surface, and is arranged along the axial direction of the connecting shaft 4, and is connected to the outside at the top of the negative pressure adsorption area through the air inlet 51; at the same time, when the air inlet 51 overlaps with the water suction port 21, the entire air flow path is connected;

[0064] The negative pressure box 5 of the annular structure can effectively ensure the uniformity of the weight distribution of the entire finishing roller 2. At the same time, the negative pressure adsorption area is isolated by the partition plate, and the size of the negative pressure adsorption area is controlled, so as to form a larger vacuum pressure under the condition of limited external vacuum pressure, thereby improving the water pumping effect;

[0065] In the above structure, the water absorption hole 21, the air inlet 51, the negative pressure box 5, the air extraction chamber 41 and the external negative pressure device constitute a complete and interconnected air movement path. Since the negative pressure box 5 is fixedly connected to the connecting shaft 4, and the finishing roller 2 is rotatably connected to the connecting shaft 4, the finishing roller 2 will rotate under the drive of the external papermaking mesh cage; during the rotation process, the water absorption hole 21 located on the finishing roller 2 will overlap with the air inlet 51 located at the top of the negative pressure box 5 in the radial direction, thereby opening the entire air flow path. Under the action of the negative pressure inside the negative pressure box 5, the air in the external environment will pass through the finishing net 3 from the water absorption hole 21 and the air inlet 51 into the negative pressure box 5, and finally be discharged through the air absorption hole 62 and the air extraction chamber 41;

[0066] In the above structure, the negative pressure box 5 is in a stationary state, while the finishing roller 2 is in a moving state, thereby realizing continuous rotation of the finishing net 3, and then completing the dehydration operation of the entire finishing net 3 in a continuous cycle. The above structure not only meets the basic requirements for the equipment, but also realizes uninterrupted dehydration of the finishing net 3. At the same time, the negative pressure box 5 in a stationary state is convenient for achieving conduction with an external negative pressure device through a simple structure, thereby simplifying the structure of the entire equipment, effectively improving the stability and reliability of the equipment operation, and simplifying the equipment inspection and maintenance procedures.

[0067] Meanwhile, in the above structure, the air inlet 51 is an arc surface, while the water absorption holes 21 are hole structures. By setting the arc surface, a fan-shaped negative pressure water absorption area is formed. As long as the water absorption holes are within this area, the air flow passage can be penetrated, thereby prolonging the water absorption time and further reducing the water content of the finishing net 3. At the same time, the water absorption holes 21 are hole structures, and their small flow area can effectively increase the air pressure, thereby improving the water absorption efficiency. It improves the pumping quality from both the operation time and operation pressure aspects, and further improves the control ability of the water content of the finishing net 3.

[0068] Embodiment 3

[0069] Referring to Figure 10 , on the basis of Embodiment 1, this embodiment discloses a finishing device for papermaking, including a mounting frame 1, a finishing roller 2 and a water absorption device. The mounting frame 1 is hinged with a swing arm 9 through a rotating shaft 4. One end of the swing arm 9 is provided with a connecting shaft 4, and the finishing roller 2 is rotationally connected to the connecting shaft 4 through a rolling bearing.

[0070] The water absorption device includes a negative pressure box 5. The negative pressure box 5 is an arc structure. Along the axial direction of the negative pressure box 5, the inner side of the negative pressure box 5 is a mounting surface 6, and the outer side is an air inlet surface 7. During installation, the mounting surface 6 of the negative pressure box 5 is fixedly attached to the outer surface of the connecting shaft 4, and the air inlet surface 7 of the negative pressure box 5 faces the inner side surface of the finishing roller 2. An exhaust port 52 is provided on the mounting surface 6, and an air inlet 51 is provided on the air inlet surface 7. The air inlet 51 is smaller than the exhaust port 52. At the same time, in the cross-section, the cross-sectional area of the air inlet surface 7 is smaller than that of the mounting surface 6, so as to ensure that along the air flow direction, the flow area of the negative pressure box 5 increases linearly. The specific dimensional parameters of the mounting surface 6 and the air inlet surface 7 are determined comprehensively by technical parameters such as adsorption pressure.

[0071] The arc-shaped negative pressure box 5 can effectively reduce the space it occupies, thereby reducing the weight of the entire set of equipment and facilitating the later adjustment of the connecting shaft 4.

[0072] It should be noted that the finishing roller can not only be made by curling a thin steel plate and then punching holes, but also by enclosing and welding a stainless steel mesh. This greatly expands the source of the finishing roller and is beneficial to reducing the cost of the equipment.

[0073] Embodiment 4

[0074] Referring to Figure 11 , as a preferred embodiment of the present invention, this embodiment discloses a finishing method for the finishing device for papermaking according to Embodiment 1 or Embodiment 2, including the following steps:

[0075] S1. The finishing roller drives the finishing net to rotate synchronously, and pushes the finishing net to squeeze and finish the paper to be finished attached to the papermaking wire cage; during the squeezing and finishing process, the finishing net adsorbs the moisture discharged by the paper to be finished during the squeezing and finishing process;

[0076] First, install the entire papermaking equipment on the papermaking equipment. Place the finishing roller on the papermaking wire cage of the papermaking equipment. At the same time, control the extrusion pressure of the finishing roller on the papermaking wire cage by adjusting the position of the balance weight;

[0077] After the equipment debugging is completed, start the paper machine. The finishing roller rotates driven by the papermaking wire cage. During one rotation cycle, the finishing roller drives the finishing net to rotate synchronously. The finishing net squeezes the paper brought out by the papermaking wire cage at the contact position between the finishing roller and the papermaking wire cage; at the same time, part of the moisture squeezed out from the paper flows downward under the action of gravity, and the other part is adsorbed by the finishing net and temporarily accumulated;

[0078] S2. The finishing net that has completed the finishing operation and adsorbed moisture continues to rotate driven by the finishing roller. The water suction device sucks the moisture adsorbed in the finishing net through the water suction holes;

[0079] Driven by the finishing roller, the finishing net that has completed the finishing and adsorbed moisture is separated from the paper and continues to rotate;

[0080] During the rotation process, the water suction holes located on the finishing roller will overlap with the air inlet in the radial direction, thus conducting the air flow path composed of the water suction holes, the air inlet, the negative pressure box and the exhaust cavity. Due to the negative pressure in the negative pressure box, the air in the external atmospheric environment will pass through the finishing net and enter the negative pressure box from the water suction holes. The air will take away the moisture attached to the finishing net during the process of passing through the finishing net, thus dehydrating the finishing net;

[0081] At the same time, it should be noted that there is a certain gap between the negative pressure box and the finishing roller. The width of this gap is generally 5-15 filaments. During the dehydration process of the negative pressure box, even if the water suction holes and the air inlet do not overlap, a small amount of moisture is dehydrated due to the negative pressure;

[0082] The dehydrated finishing net continues to rotate driven by the finishing roller and performs the squeezing and finishing operation again. Repeating the above process can continuously output the finished paper.

[0083] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present application, or directly or indirectly applied to other related technical fields, is equally included in the patent protection scope of the present application.

Claims

1. A finishing device for papermaking, characterized in that, including a mounting frame (1); a finishing roller (2), a connecting shaft (4) is arranged on the mounting frame (1), the finishing roller (2) is rotationally connected to the connecting shaft (4), and a plurality of water absorption holes (21) are further arranged on the working surface of the finishing roller (2); a finishing mesh (3), the finishing mesh (3) is fixed to the working surface of the finishing roller (2); the finishing mesh (3) is used for finishing the paper and adsorbing the water extruded from the paper during the process of the finishing roller (2) squeezing the paper; the finishing mesh (3) is a three-layer polyester mesh or a two-and-a-half-layer polyester mesh, and the mesh number of the finishing mesh (3) is 60-90 meshes; a water absorption device, the water absorption device forms a negative pressure in the finishing roller (2) to suck the water in the finishing mesh (3) through the water absorption holes (21); the water absorption device includes a negative pressure box (5) fixed to the connecting shaft (4), and an air inlet (51) and an air outlet (52) are respectively arranged on the negative pressure box (5); the air inlet (51) is sequentially communicated with a plurality of the water absorption ports (21) during the rotation of the finishing roller (2); the negative pressure box (5) is of an annular structure, along the radial direction of the negative pressure box (5), two partition plates (53) are arranged in the negative pressure box (5), and a negative pressure adsorption area is divided in the negative pressure box (5) by the two partition plates (53) arranged along the axial direction of the negative pressure box (5); and along the air flow direction, the through-flow area of the negative pressure adsorption area increases linearly.

2. The finishing device for papermaking according to claim 1, characterized in that, the negative pressure box (5) is of an arc-shaped box structure, and along the air flow direction, the through-flow area of the negative pressure box (5) increases linearly.

3. The finishing device for papermaking according to claim 1, characterized in that, an exhaust cavity (41) is further arranged on the connecting shaft (4), and the exhaust cavity (41) is communicated with the negative pressure box (5).

4. A finishing device for papermaking according to claim 1, wherein, the mounting frame (1) is further hinged with a swing arm (9) through a rotating shaft (8), the connecting shaft (4) is connected to one end of the swing arm (9), and a balance weight (10) is arranged at the other end of the swing arm (9).

5. The finishing device for papermaking according to claim 4, characterized in that, a damping device (11) is further arranged on the swing arm (9).

6. A papermaking finishing method for the papermaking finishing device according to any one of claims 1 to 5, characterized in that including the following steps: the finishing roller drives the finishing mesh to rotate synchronously, and pushes the finishing mesh to squeeze and finish the paper to be finished attached to the paper-making wire cage; the finishing mesh adsorbs the water discharged from the paper to be finished during the squeezing and finishing process; the finishing mesh that has completed the finishing operation and adsorbed water continues to rotate driven by the finishing roller. During the rotation process, the water absorption holes on the finishing roller will overlap with the air inlet in the radial direction, so as to conduct the air flow path composed of the water absorption holes, the air inlet, the negative pressure box and the exhaust cavity. Due to the negative pressure in the negative pressure box, the air in the external atmospheric environment will pass through the finishing mesh and enter the negative pressure box from the water absorption holes. The air will take away the water attached to the finishing mesh during the process of passing through the finishing mesh, so as to dehydrate the finishing mesh.

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