Paper stabilizing air bellow device for drying part of paper machine

Abstract

A paper stabilizing air bellow device of a drying part of a paper machine comprises a fixing support, an air bellow, an air draft pipeline and a suction assembly. The fixing support is arranged between the two sets of drying cylinders in the upper row, the air bellow is arranged on the fixing support and located above the drying cylinders in the lower row, the air draft pipeline is located above the drying cylinders in the upper row and connected with an air channel of the air bellow, and the suction assembly is connected with an air channel of the air draft pipeline. The cross section of the air bellow is conical, the two inclined side surfaces of the air bellow are parallel to a drying net on the drying cylinder, and the bottom of the air bellow is of an upwards arched arc-shaped structure; a plurality of suction openings are formed in the two inclined side faces of the air bellow, an air outlet is further formed in the straight side end of the air bellow, the suction openings are opposite to the surface of the drying net, and the air outlet is connected with an air channel of an air suction pipeline. Due to the fact that the paper stabilizing air bellow device is additionally arranged between the drying cylinders, the problems of paper sheet wrinkling, edge drifting and the like are effectively solved, and the paper breaking risk is greatly reduced; the utility model has the advantages of strong practicability and strong popularization significance.

Description

Technical Field

[0001] The utility model relates to the field of papermaking production, in particular to a paper stabilizing bellows device of a drying section of a paper machine. Background Art

[0002] Conventional paper machine pre-drying first and second drying are mostly single-hanging net designs, which are prone to the formation of air pockets in the wet paper during the production process, resulting in wrinkles. Specifically, the dryer net carries a large amount of interface air to form a positive pressure at the entrance area of ​​the lower drying cylinder, and is forced into the net cylinder collection area. A lot of air is pressed into the dryer net and is intercepted and gathered between the dryer net and the paper along the lower drying cylinder, causing the paper to float off the dryer net and lose stability; or when the paper enters the upper cylinder, the air is forced out, causing wrinkles, fluttering, etc.

[0003] As the speed of the machine increases, the air carried by the moving surfaces of the dryer, drying cylinder and guide rollers disturbs the paper, and the above problems will be further aggravated. In order to stabilize the paper web, a larger speed difference is often adjusted to make the paper web tight, but this will increase the frequency of paper breaks and lose a lot of paper performance. Utility Model Content

[0004] Based on this, it is necessary to provide a paper stabilizing bellows device for the drying section of a paper machine in view of the deficiencies in the prior art.

[0005] A paper stabilizing bellows device in the drying section of a paper machine, comprising a fixed bracket, a bellows, an exhaust duct and a suction assembly. The fixed bracket is arranged between two groups of upper drying cylinders, the bellows is mounted on the fixed bracket and is located above a lower drying cylinder, the exhaust duct is located above the upper drying cylinder and is connected to the bellows air path, and the suction assembly is connected to the exhaust duct air path. The cross section of the bellows is conical in design, its two oblique side surfaces are arranged parallel to the dry net on the drying cylinder, and its bottom is an upward arched arc structure. A plurality of exhaust ports are arranged on the two oblique side surfaces of the bellows, and an air outlet is also arranged on a straight side end of the bellows, the plurality of exhaust ports are opposite to the surface of the dry net, and the air outlet is connected to the exhaust duct air path.

[0006] Furthermore, the bellows also includes a sealing plate, and the sealing plate is installed at the bottom of the bellows.

[0007] Furthermore, the bellows also includes a manual regulating valve, and the manual regulating valve is installed on the air outlet.

[0008] Furthermore, the exhaust duct includes a main air duct and a plurality of bellows branches connected to the main air duct gas path, and the bellows are provided with a plurality of groups. The main air duct is also connected to the suction assembly gas path, and the plurality of bellows branches are also respectively connected to the gas paths of the plurality of groups of bellows.

[0009] Furthermore, the suction assembly includes a variable frequency motor, a gear box and a centrifugal fan, and the two ends of the gear box are respectively connected to the variable frequency motor and the centrifugal fan. The centrifugal fan is provided with an air inlet and an air outlet, wherein the air inlet is connected to the main air duct air path.

[0010] To sum up, the beneficial effect of the paper stabilizing bellows device in the drying section of a paper machine of the utility model is that by adding a paper stabilizing bellows device between the drying cylinders, the air between the dry net and the paper sheets is extracted by an exhaust centrifugal fan, thereby effectively solving the problems of paper sheet wrinkles, edge fluttering, etc. and greatly reducing the risk of paper breakage, so that the speed of the paper machine can be further increased, and the operating efficiency and economic benefits are effectively improved; the utility model is highly practical and has a strong promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the installation structure of a paper stabilizing bellows device in the drying section of a paper machine according to the utility model;

[0012] Figure 2 FIG. 1 is a schematic diagram of the main structure of a fixed bracket and a bellows in a paper stabilizing bellows device in a drying section of a paper machine according to the utility model;

[0013] Figure 3 for Figure 1 A schematic diagram of the side view of the stroke box;

[0014] Figure 4 for Figure 1 Schematic diagram of the structure of the suction component. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0016] like Figures 1 to 4 As shown, the utility model provides a paper stabilizing bellows device 100 for the drying section of a paper machine, which comprises a fixed bracket 10, a bellows 20, an exhaust duct 30 and a suction assembly 40. The fixed bracket 10 is arranged between two groups of upper drying cylinders, the bellows 20 is mounted on the fixed bracket 10 and is located above the lower drying cylinder, the exhaust duct 30 is located above the upper drying cylinder and is connected to the bellows 20 in an air path, and the suction assembly 40 is connected to the exhaust duct 30 in an air path.

[0017] The cross section of the bellows 20 is conical in design, and its two oblique sides are arranged parallel to the dry net on the drying cylinder, and its bottom is an arched arc structure. A number of air suction ports 21 are arranged on the two oblique sides of the bellows 20, and an air outlet 22 is also arranged on a straight side end of the bellows 20. The air suction ports 21 are opposite to the surface of the dry net, and the air outlet 22 is connected to the air path of the air suction duct 30. The bellows 20 arranged between the drying cylinders can suck the air in the nearby space, so that a negative pressure or even a vacuum environment is formed between the dry net and the paper sheet, thereby making the two fit closely. The air outlet 22 on the oblique side is designed to be opposite to the surface of the dry net, which can maximize the suction effect of the bellows 20, so that the device can play a better role.

[0018] Specifically, in this embodiment, the bellows 20 further includes a sealing plate 23, which is installed at the bottom of the bellows 20. The bellows 20 further includes a manual regulating valve 24, which is installed on the air outlet 22. The sealing plate 23 can improve the airtightness of the bellows 20 and reduce the problem of outside air flowing into the bellows 20 from the bottom to affect the air extraction efficiency of the air extraction port 21. The manual regulating valve 24 can adjust the suction strength of the bellows 20 at any time to adapt to the production of different types of paper sheets.

[0019] The exhaust duct 30 includes a main air duct 31 and a plurality of wind box branches 32 connected to the main air duct 31, and the wind boxes 20 are provided with a plurality of groups. The main air duct 31 is also connected to the suction assembly 40, and the plurality of wind box branches 32 are also connected to the plurality of wind boxes 20 one by one. The plurality of wind boxes 20 can correspond to the gaps between the plurality of drying cylinders on the paper machine, so that the paper stabilizing function of the device can fully cover the paper machine. The main branch structure of the exhaust duct 30 enables each group of wind boxes 20 to share the same suction assembly 40 drive, thereby improving the utilization rate of the equipment.

[0020] The suction assembly 40 includes a variable frequency motor 41, a gear box 42 and a centrifugal fan 43, and the two ends of the gear box 42 are respectively connected to the variable frequency motor 41 and the centrifugal fan 43. The centrifugal fan 43 is provided with an air inlet 431 and an air outlet 432, wherein the air inlet 431 is connected to the main air duct 31. The variable frequency motor 41 is easy to perform frequency conversion adjustment, so that the driven centrifugal fan 43 creates a negative pressure environment between the dryer network and the paper sheet with the optimal suction power, which is both energy-saving and reliable.

[0021] To sum up, the beneficial effect of the paper stabilizing bellows device 100 in the drying section of a paper machine of the utility model is that by adding a paper stabilizing bellows device between the drying cylinders and utilizing the exhaust centrifugal fan 43 to extract the air between the dry net and the paper sheets, the problems of paper sheet wrinkles and fluttering are effectively solved and the risk of paper breakage is greatly reduced, so that the speed of the paper machine can be further increased, and the operating efficiency and economic benefits are effectively improved; the utility model is highly practical and has a strong promotional significance.

[0022] The above-mentioned embodiment only expresses one implementation method of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A paper stabilizing bellows device in the drying section of a paper machine, characterized in that: It includes a fixed bracket, a bellows, an exhaust duct and a suction assembly; the fixed bracket is arranged between two groups of upper drying cylinders, the bellows is installed on the fixed bracket and is located above the lower drying cylinders, the exhaust duct is located above the upper drying cylinders and is connected to the bellows air path, and the suction assembly is connected to the exhaust duct air path; the cross-section of the bellows is conical in design, its two oblique side surfaces are arranged parallel to the dry net on the drying cylinder, and its bottom is an upward arched arc structure; a number of exhaust ports are arranged on the two oblique side surfaces of the bellows, and an air outlet is also arranged on a straight side end of the bellows, and the several exhaust ports are opposite to the surface of the dry net, and the air outlet is connected to the exhaust duct air path.

2. The paper stabilizing bellows device of the drying section of a paper machine according to claim 1, characterized in that: The bellows also includes a sealing plate, which is installed at the bottom of the bellows.

3. The paper stabilizing bellows device of the drying section of a paper machine according to claim 1, characterized in that: The bellows also includes a manual regulating valve, which is installed on the air outlet.

4. The paper stabilizing bellows device of the drying section of a paper machine according to claim 1, characterized in that: The exhaust duct includes a main air duct and several bellows branches connected to the main air duct air circuit, and the bellows are provided with multiple groups accordingly; the main air duct is also connected to the suction component air circuit, and the several bellows branches are also respectively connected to the air circuits of multiple groups of bellows one by one.

5. The paper stabilizing bellows device of the drying section of a paper machine according to claim 1, characterized in that: The suction assembly includes a variable frequency motor, a gear box and a centrifugal fan, and the two ends of the gear box are respectively connected to the variable frequency motor and the centrifugal fan; the centrifugal fan is provided with an air inlet and an air outlet, wherein the air inlet is connected to the main air duct air path.

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