A paper stabilizer

Abstract

The utility model provides a paper stabilizer, which is arranged in an area surrounded by a first drying cylinder, a second drying cylinder and a vacuum roller, and includes a main structure; a first pipeline; a second pipeline, the first end of the second pipeline is connected to the first sub-cavity in the first inner cavity, and the second end of the second pipeline shares the exhaust port of the first pipeline; a third pipeline, the first end of the third pipeline passes through the closed port of the first pipeline, and the second end of the third pipeline extends and passes through the side wall of the first pipeline to communicate with the second inner cavity; a first valve; and a second valve. In the inner cavity, a first pipeline is arranged for exhaust, and at the same time, a third pipeline is arranged in the first pipeline for air supply, and a second pipeline is also arranged in the first pipeline. With the action of the first valve and the second valve, the negative pressure of the corresponding area can be adjusted, so as to meet the negative pressure requirements of the paper stabilizer at different stages in the paper web transmission process, and enhance the adaptability of the paper stabilizer.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking, in particular to a paper stabilizer. Background Art

[0002] During the paper web production process, the paper web needs to go through multiple processes, such as pressing, drying, calendering, etc. A paper stabilizer is usually set up during the transmission of the paper web. The paper stabilizer can help fix the paper web and prevent the paper web from displacement, wrinkles or ripples during movement, thereby ensuring that each process can be carried out accurately.

[0003] Although the existing paper stabilizer can reduce the displacement of the paper web during the movement, the paper web has different air pressure requirements in the paper guiding and paper stabilization stages during the paper web transmission process. If the air pressure is too low, the paper web is prone to slipping, and if the air pressure is too high, the paper web is prone to breakage and paper defects. It can be seen that the existing paper stabilizer has poor adaptability during the paper web transmission process. Utility Model Content

[0004] The main purpose of the utility model is to provide a paper stabilizer, aiming to solve the problem that the existing paper stabilizer has poor adaptability during the paper web conveying process.

[0005] To achieve the above object, the utility model provides a paper stabilizer, which is arranged in an area surrounded by a first drying cylinder, a second drying cylinder and a vacuum roller, and comprises:

[0006] A main structure, the main structure comprising a first side box, a second side box, a first sealing plate, a second sealing plate and a third sealing plate, the first side box being arranged between the first drying cylinder and the vacuum roller, the second side box being arranged between the second drying cylinder and the vacuum roller, the first sealing plate being arranged at the front end of a triangular area surrounded by the first drying cylinder, the second drying cylinder and the vacuum roller, the second sealing plate being arranged at the top of a paper guiding partition inside the vacuum roller, and the second sealing plate being adapted to the vacuum roller, the third sealing plate being arranged at the rear end of a triangular area surrounded by the first drying cylinder, the second drying cylinder and the vacuum roller, the first side box, the second side box, the first sealing plate, the second sealing plate and the third sealing plate being matched to form an inner cavity, the inner cavity comprising a first inner cavity close to the first side box and a second inner cavity close to the second side box;

[0007] A first pipeline, wherein the first pipeline passes through the main structure and is located between the first inner cavity and the second inner cavity, wherein a first end of the first pipeline is a closed port, and a second end of the first pipeline is an air extraction port;

[0008] a second pipeline, wherein a first end of the second pipeline is connected to a first sub-cavity in the first inner cavity, a second end of the second pipeline shares a common air outlet of the first pipeline, and the first sub-cavity corresponds to a paper feeding area of ​​the paper stabilizer;

[0009] A third pipeline, wherein a first end of the third pipeline passes through the closed opening of the first pipeline, and a second end of the third pipeline extends and passes through the side wall of the first pipeline to communicate with the second inner cavity;

[0010] a first valve, the first valve being arranged in the second pipeline, and when the first valve is in an open state, the second sub-chamber in the first inner chamber and the first sub-chamber are both connected to the air extraction port, and when the first valve is in a closed state, the first sub-chamber is connected to the air extraction port, and the second sub-chamber is not connected to the air extraction port, and the second sub-chamber corresponds to the paper stabilizing area of ​​the paper stabilizer;

[0011] The second valve is arranged in the second inner cavity. When the second valve is in a closed state, the second inner cavity includes a third sub-cavity and a fourth sub-cavity respectively on both sides of the second valve. The second end of the third pipeline is connected with the fourth sub-cavity. The third sub-cavity corresponds to the paper feeding area of ​​the paper stabilizer, and the fourth sub-cavity corresponds to the paper stabilizing area of ​​the paper stabilizer.

[0012] Optionally, end face air nozzles are also provided on the first side box body and the second side box body.

[0013] Optionally, a paper feeding nozzle is arranged on the second side box.

[0014] Optionally, a scraper clamp and a scraper matched with the scraper clamp are further provided on the side of the second side box facing the vacuum roller.

[0015] Optionally, a sealing member is provided at a connection position between the first side box body and the second side box body, and when the sealing member is in a sealed state, airflow inside the paper stabilizer is isolated from airflow outside.

[0016] Optionally, the sealing element is a double-layer Teflon sealing strip.

[0017] Optionally, the paper stabilizer further includes a first cylinder and a second cylinder, the first cylinder is connected to the first valve to control the first valve to be opened or closed, and the second cylinder is connected to the second valve to control the second valve to be opened or closed.

[0018] Optionally, the paper stabilizer further includes an exhaust fan, and the exhaust fan is arranged at an exhaust port of the first pipeline.

[0019] Optionally, the paper stabilizer further includes an air blower, and the air blower is arranged at the first end of the third pipeline.

[0020] Optionally, the paper stabilizer further includes a wind pressure sensor, and the wind pressure sensor is arranged in the inner cavity.

[0021] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0022] The utility model provides a paper stabilizer, which is arranged in an area surrounded by a first drying cylinder, a second drying cylinder and a vacuum roller, and the paper stabilizer comprises: a main structure, a main structure, the main structure comprises a first side box body, a second side box body, a first sealing plate, a second sealing plate and a third sealing plate, the first side box body is arranged between the first drying cylinder and the vacuum roller, the second side box body is arranged between the second drying cylinder and the vacuum roller, the first sealing plate is arranged at the front end of a triangular area surrounded by the first drying cylinder, the second drying cylinder and the vacuum roller, and the second sealing plate is arranged on the top of a paper guiding partition inside the vacuum roller , and the second sealing plate is adapted to the vacuum roller, the third sealing plate is arranged at the rear end of the triangular area surrounded by the first drying cylinder, the second drying cylinder and the vacuum roller, the first side box, the second side box, the first sealing plate, the second sealing plate and the third sealing plate cooperate to form an inner cavity, the inner cavity includes a first inner cavity close to the first side box and a second inner cavity close to the second side box, the inner cavity includes a first inner cavity close to the first side box and a second inner cavity close to the second side box; a first pipeline, the first pipeline runs through the main structure, and is located between the first inner cavity and the third inner cavity The first end of the first pipeline is a closed port, and the second end of the first pipeline is an exhaust port between the two inner chambers; the second pipeline, the first end of the second pipeline is connected to the first sub-cavity in the first inner chamber, the second end of the second pipeline shares the exhaust port of the first pipeline, and the first sub-cavity corresponds to the paper feeding area of ​​the paper stabilizer; the third pipeline, the first end of the third pipeline passes through the closed port of the first pipeline, the second end of the third pipeline extends and passes through the side wall of the first pipeline, and is connected to the second inner chamber; the first valve, the first valve is arranged in the second pipeline, and when the first valve is in the open state, the first The second sub-chamber and the first sub-chamber in the inner cavity are both connected to the exhaust port. When the first valve is in a closed state, the first sub-chamber is connected to the exhaust port, and the second sub-chamber is not connected to the exhaust port. The second sub-chamber corresponds to the paper stabilizing area of ​​the paper stabilizer; the second valve, the second valve is arranged in the second inner cavity, when the second valve is in a closed state, the second inner cavity includes a third sub-chamber and a fourth sub-chamber respectively on both sides of the second valve, the second end of the third pipeline is connected to the fourth sub-chamber, the third sub-chamber corresponds to the paper feeding area of ​​the paper stabilizer, and the fourth sub-chamber corresponds to the paper stabilizing area of ​​the paper stabilizer. In the embodiment of the utility model, in the inner cavity formed by the first side box body, the second side box body, the first sealing plate, the second sealing plate and the third sealing plate, a first pipeline is arranged for exhaust, and at the same time, a third pipeline is arranged in the first pipeline for air supply, and a second pipeline is also arranged in the first pipeline. With the action of the first valve and the second valve, the negative pressure of the corresponding area can be adjusted, so as to meet the negative pressure requirements of the paper stabilizer at different stages during the paper web transmission process, and enhance the adaptability of the paper stabilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is one of the structural schematic diagrams of a paper stabilizer provided in an embodiment of the utility model;

[0025] Figure 2 This is the second structural schematic diagram of a paper stabilizer provided by an embodiment of the utility model;

[0026] Figure 3 This is a third structural schematic diagram of a paper stabilizer provided by an embodiment of the utility model;

[0027] Figure 4 This is the fourth structural schematic diagram of a paper stabilizer provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0028] All technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0031] The utility model provides a paper stabilizer, such as Figures 1 to 4As shown, the paper stabilizer 10 is arranged in an area surrounded by the first drying cylinder 20, the second drying cylinder 30 and the vacuum roller 40, and the paper stabilizer 10 includes:

[0032] A main body structure, the main body structure includes a first side box 101, a first sealing plate 102, a second side box 103, a second sealing plate and a third sealing plate, the first side box 101 is arranged between the first drying cylinder 20 and the vacuum roller 40, the second side box 103 is arranged between the second drying cylinder 30 and the vacuum roller 40, the first sealing plate 102 is arranged at the front end of the triangular area surrounded by the first drying cylinder 20, the second drying cylinder 30 and the vacuum roller 40, the second sealing plate is arranged on the top of the paper guiding partition inside the vacuum roller, and the second sealing plate is adapted to the vacuum roller 40, the third sealing plate is arranged at the rear end of the triangular area surrounded by the first drying cylinder 20, the second drying cylinder 30 and the vacuum roller 40, the first side box 101, the second side box 103, the first sealing plate 102, the second sealing plate and the third sealing plate cooperate to form an inner cavity, the inner cavity includes a first inner cavity 104 close to the first side box 101 and a second inner cavity 105 close to the second side box 103;

[0033] A first pipeline 106, which passes through the main structure and is located between the first inner cavity 104 and the second inner cavity 105. The first end of the first pipeline 106 is a closed end, and the second end of the first pipeline 106 is an air extraction port;

[0034] A second pipeline 107, wherein a first end of the second pipeline 107 is connected to a first sub-cavity in the first inner cavity 104, and a second end of the second pipeline 107 shares the air outlet of the first pipeline 106, wherein the first sub-cavity corresponds to a paper feeding area of ​​the paper stabilizer;

[0035] A third pipeline 108, wherein a first end of the third pipeline 108 penetrates the closed opening of the first pipeline 106, and a second end of the third pipeline 108 extends and penetrates the side wall of the first pipeline 106, and is communicated with the second inner cavity 105;

[0036] The first valve 109 is arranged in the second pipeline 107. When the first valve 109 is in the open state, the second sub-chamber in the first inner chamber 104 and the first sub-chamber are both connected to the exhaust port. When the first valve 109 is in the closed state, the first sub-chamber is connected to the exhaust port, and the second sub-chamber is not connected to the exhaust port. The second sub-chamber corresponds to the paper stabilizing area of ​​the paper stabilizer.

[0037] The second valve 1010 is arranged in the second inner cavity 105. When the second valve 1010 is in the closed state, the second inner cavity 105 includes a third sub-cavity and a fourth sub-cavity on both sides of the second valve 1010 respectively. The second end of the third pipeline 108 is connected to the fourth sub-cavity. The third sub-cavity corresponds to the paper feeding area of ​​the paper stabilizer, and the fourth sub-cavity corresponds to the paper stabilizing area of ​​the paper stabilizer.

[0038] The first valve 109 and the second valve 1010 work together. When the second valve 1010 is in an open state, the first valve 109 is closed. The third sub-chamber on the side of the second inner cavity 105 is opened, the first sub-chamber in the first inner cavity 104 is connected to the exhaust port, the second sub-chamber is not connected to the exhaust port, and the third sub-chamber corresponds to the paper feeding area of ​​the paper stabilizer. When the second valve 1010 is in a closed state, the first valve 109 is opened. The third sub-chamber on the side of the second inner cavity 105 is closed, and the first sub-chamber and the second sub-chamber in the first inner cavity 104 are both connected to the exhaust port.

[0039] In the embodiment of the utility model, a first pipeline 106 is provided in an inner cavity formed by the cooperation of the first side box 101, the second side box 103, the first sealing plate 102, the second sealing plate and the third sealing plate for exhausting air, and at the same time, a third pipeline 108 is provided in the first pipeline 106 for supplying air, and a second pipeline 107 is also provided in the first pipeline 106, and the negative pressure of the corresponding area can be adjusted in cooperation with the first valve 109 and the second valve 1010, so as to meet the negative pressure requirements of the paper stabilizer at different stages in the paper web conveying process, thereby enhancing the adaptability of the paper stabilizer.

[0040] Specifically, the paper stabilizer 10 can be installed in the triangular area surrounded by the first drying cylinder 20, the second drying cylinder 30 and the vacuum roller 40. In an optional example, the paper stabilizer can also include a first cylinder and a second cylinder, wherein the first cylinder is connected to the first valve 109 to control the opening or closing of the first valve 109, and the second cylinder is connected to the second valve 1010 to control the opening or closing of the second valve 1010. The first cylinder can control the first valve 109 to be in a closed state to form a paper guiding area and a paper stabilizing area in the longitudinal direction of the vacuum roller 40; the second cylinder can control the second valve 1010 to be in a closed state to form a paper guiding area and a paper stabilizing area in the transverse direction in the peeling down area (i.e., the area corresponding to the first side box 101).

[0041] In the paper feeding stage, the first valve 109 is controlled to be in a closed state, the second valve 1010 is controlled to be in an open state, the first sub-chamber is connected to the exhaust port, the second sub-chamber is not connected to the exhaust port, and the vacuum roller 40 at the bottom of the paper stabilizer 10 is only exhausted near the paper feeding area on the operating side. When feeding paper, the exhaust air volume of the exhaust port is concentrated on the first sub-chamber, so that the negative pressure of the paper feeding area corresponding to the first sub-chamber increases, and the second inner cavity 105 is connected when the second valve 1010 is in an open state, and the air supply volume can act on the paper feeding area corresponding to the third sub-chamber through the third pipeline 108, so that the paper web can be closely attached to the dryer network and the lower vacuum roller 40, thereby improving the success rate of paper feeding.

[0042] In the paper stabilization stage, the first valve 109 is controlled to be in an open state, and the second valve 1010 is controlled to be in a closed state. The first sub-chamber and the second sub-chamber are both connected to the exhaust port, and the vacuum roller 40 at the lower part of the paper stabilizer 10 exhausts air in its entirety; the second end of the third pipeline 108 extends and passes through the side wall of the first pipeline 106 and is connected to the fourth sub-chamber in the second inner chamber 105. When the paper is stabilized, the exhaust air volume of the exhaust port is dispersed to act on the first inner chamber 104 (including the first sub-chamber and the second sub-chamber), so that the negative pressure of the paper stabilization area corresponding to the second sub-chamber increases, and when the second valve 1010 is closed, the second inner chamber 105 is divided into the third sub-chamber and the fourth sub-chamber, and the second end of the third pipeline 108 is connected to the fourth sub-chamber, so that the air volume can act on the fourth sub-chamber through the third pipeline 108, balancing the negative pressure in the paper stabilization area and the paper feeding area, and improving the stability of paper web transportation.

[0043] Optionally, the paper stabilizer further includes an exhaust fan, which is disposed at the exhaust port of the first pipeline 106. The exhaust fan may be a negative pressure fan, which works similarly to a vacuum cleaner, and absorbs air by generating negative pressure, thereby fixing the paper web. The exhaust fan can be used to control the air pressure inside the paper stabilizer, ensuring that a stable and appropriate negative pressure level is maintained, so that the paper web can be reliably fixed at a specified position. The exhaust port of the first pipeline 106 may be located on the transmission side of the paper stabilizer to reduce the interference of the pipeline.

[0044] Optionally, the paper stabilizer further comprises an air blower, which is arranged at the first end of the third pipeline 108. The air blower may be an air blower to generate a strong and uniform airflow. The air blower may adjust the air volume and air pressure as required. The air blower blows out air through the third pipeline 108, which can support and lift the paper web in the paper stabilizer and paper guide area corresponding to the second inner cavity. Especially when it is necessary to change the paper web path or handle soft paper web, this air support can effectively prevent the paper web from folding or being damaged. The first end of the third pipeline 108 may be the operating side of the paper stabilizer to reduce the situation of pipeline interference.

[0045] Optionally, end face air nozzles are further provided on the first side box 101 and the second side box 103. The end face air nozzles are provided to enhance the sealing performance of the paper stabilizer and reduce the wear of the mechanical hard sealing plate on the drying network. The end face air nozzles can also blow out hot air to accelerate the drying process of the paper web and increase the production speed.

[0046] Optionally, a paper drawing nozzle is provided on the second side box. The paper web may deviate due to inertia or mechanical problems. By providing the paper drawing nozzle, a closed paper drawing area is formed on the side of the paper stabilizer during paper drawing, so that the paper web is closely attached to the dryer net under the action of negative pressure when it leaves the second drying cylinder 30, thereby avoiding wrinkles or breaks in the paper web, ensuring that the paper web can be accurately transferred to the next step, and improving the continuity and efficiency of the production line.

[0047] Optionally, a scraper clamp and a scraper adapted to the scraper clamp are also provided on the side of the second side box 103 facing the vacuum roller 40. The scraper rotates close to the surface of the roller or dryer, and removes pulp residues, impurities or other sediments adhering to it by physical cutting or peeling. This helps to keep the roller surface clean and ensure the smooth progress of subsequent processes. By keeping the roller clean, the scraper reduces the friction and tension fluctuations of the paper sheet caused by surface impurities, thereby reducing the possibility of paper sheet damage or breakage and improving the stability of the overall operation of the production line. The scraper clamp is used to accurately fix and support the scraper to ensure that the scraper can be close to the surface of the roller or dryer to provide effective and consistent scraping pressure. By adjusting the position and pressure of the scraper clamp, the contact angle and force of the scraper with the working surface can be changed, thereby accurately controlling the scraping effect to meet different process requirements.

[0048] Optionally, a sealing member 1011 is provided at a connection position between the first side box and the second side box. When the sealing member is in a sealed state, airflow inside the paper stabilizer 10 is isolated from airflow outside.

[0049] In this embodiment, the two ends and the side paper feeding area of ​​the paper stabilizer 10 adopt an air supply type air flow sealing method to isolate the entire interior of the paper stabilizer 10 from the outside world, ensure the negative pressure in the entire pocket area of ​​the paper stabilizer, and make the paper web close to the dryer network under the influence of negative pressure in the area between the upper and lower drying cylinders, thereby ensuring the stability of the paper web operation.

[0050] Optionally, the seal 1011 is a double-layer Teflon sealing strip to improve the sealing performance. The seal 1011 adopts a rotary seal, which is simple and convenient to operate, and the dryer net and the sealing strip can be quickly replaced. The seal adopts a double-layer Teflon sealing material, which is more wear-resistant and has better sealing performance, ensuring that the paper web leaves the upper drying cylinder and enters the negative pressure of the descending zone, thereby increasing the adsorption force between the paper sheet and the dryer net.

[0051] After the paper stabilizer 10 is installed, the upper seal 1011 rotates horizontally, and the airflow between the outside and the paper stabilizer is completely blocked by the Teflon sealing strips on both sides. The first valve 109 is controlled to make the vacuum roller 40 form a paper feeding area and a paper stabilizing area in the longitudinal direction, and the second valve 1010 is controlled to make the stripping downward area form a paper feeding area and a paper stabilizing area in the transverse direction. When feeding paper, the first valve 109 is closed, and the lower vacuum roller only exhausts air near the paper feeding area on the operating side. The second valve 1010 is opened, and the end face air nozzle and the side air nozzle supply air. The stripping downward area only forms a negative pressure near the paper feeding area on the operating side. When feeding paper, since the paper feeding area is small, all the exhaust air volume acts on the paper feeding area, which increases the negative pressure in the paper feeding area, so that the paper web of the paper feeding is closely attached to the dryer mesh and the lower vacuum roller, and the success rate of paper feeding is improved. When stabilizing the paper, the first valve 109 is opened, the lower vacuum roller exhausts the entire web and discharges it from the operating side through the first pipeline 106, the second valve 1010 is closed, and only the end nozzle supplies air, forming a negative pressure in the entire peeling downward area, and the entire paper sheet runs closely against the dryer mesh and the lower vacuum roller.

[0052] Optionally, the paper stabilizer 10 further includes a wind pressure sensor, which is disposed in the inner cavity. Different measuring points are provided in different areas inside the paper stabilizer, and the vacuum pressure is automatically transmitted to the distributed control system (DCS) through the hollow tube, without manual measurement. This improves the convenience of using the paper stabilizer.

[0053] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A paper stabilizer, characterized in that: The paper stabilizer is arranged in an area surrounded by the first drying cylinder, the second drying cylinder and the vacuum roller, and the paper stabilizer comprises: A main structure, the main structure comprising a first side box, a second side box, a first sealing plate, a second sealing plate and a third sealing plate, the first side box being arranged between the first drying cylinder and the vacuum roller, the second side box being arranged between the second drying cylinder and the vacuum roller, the first sealing plate being arranged at the front end of a triangular area surrounded by the first drying cylinder, the second drying cylinder and the vacuum roller, the second sealing plate being arranged at the top of a paper guiding partition inside the vacuum roller, and the second sealing plate being adapted to the vacuum roller, the third sealing plate being arranged at the rear end of a triangular area surrounded by the first drying cylinder, the second drying cylinder and the vacuum roller, the first side box, the second side box, the first sealing plate, the second sealing plate and the third sealing plate being matched to form an inner cavity, the inner cavity comprising a first inner cavity close to the first side box and a second inner cavity close to the second side box; A first pipeline, wherein the first pipeline passes through the main structure and is located between the first inner cavity and the second inner cavity, wherein a first end of the first pipeline is a closed port, and a second end of the first pipeline is an air extraction port; a second pipeline, wherein a first end of the second pipeline is connected to a first sub-cavity in the first inner cavity, a second end of the second pipeline shares a common air outlet of the first pipeline, and the first sub-cavity corresponds to a paper feeding area of ​​the paper stabilizer; A third pipeline, wherein a first end of the third pipeline passes through the closed opening of the first pipeline, and a second end of the third pipeline extends and passes through the side wall of the first pipeline to communicate with the second inner cavity; a first valve, the first valve being arranged in the second pipeline, and when the first valve is in an open state, the second sub-chamber in the first inner chamber and the first sub-chamber are both connected to the air extraction port, and when the first valve is in a closed state, the first sub-chamber is connected to the air extraction port, and the second sub-chamber is not connected to the air extraction port, and the second sub-chamber corresponds to the paper stabilizing area of ​​the paper stabilizer; The second valve is arranged in the second inner cavity. When the second valve is in a closed state, the second inner cavity includes a third sub-cavity and a fourth sub-cavity respectively on both sides of the second valve. The second end of the third pipeline is connected with the fourth sub-cavity. The third sub-cavity corresponds to the paper feeding area of ​​the paper stabilizer, and the fourth sub-cavity corresponds to the paper stabilizing area of ​​the paper stabilizer.

2. The paper stabilizer according to claim 1, characterized in that: End face air nozzles are also arranged on the first side box body and the second side box body.

3. The paper stabilizer according to claim 1, characterized in that: The second side box is provided with a paper feeding nozzle.

4. The paper stabilizer according to claim 1, characterized in that: A scraper clamp and a scraper matched with the scraper clamp are also arranged on the side of the second side box facing the vacuum roller.

5. The paper stabilizer according to claim 1, characterized in that: A sealing member is provided at a connection position between the first side box body and the second side box body, and when the sealing member is in a sealed state, airflow inside the paper stabilizer is isolated from airflow outside.

6. The paper stabilizer according to claim 5, characterized in that: The sealing element is a double-layer Teflon sealing strip.

7. The paper stabilizer according to claim 1, characterized in that: The paper stabilizer further includes a first cylinder and a second cylinder, wherein the first cylinder is connected to the first valve to control the first valve to be opened or closed, and the second cylinder is connected to the second valve to control the second valve to be opened or closed.

8. The paper stabilizer according to claim 1, characterized in that: The paper stabilizer further includes an exhaust fan, and the exhaust fan is arranged at an exhaust port of the first pipeline.

9. The paper stabilizer according to claim 1, characterized in that: The paper stabilizer further includes an air blower, and the air blower is arranged at the first end of the third pipeline.

10. The paper stabilizer according to claim 1, characterized in that: The paper stabilizer further includes a wind pressure sensor, and the wind pressure sensor is arranged in the inner cavity.

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