Soft roll calender capable of balancing tightness of paper web

Abstract

The utility model discloses a soft roll calender for balancing the tightness of a paper web. The soft roll calender comprises a hot roll, a soft roll, a jacking assembly, an oil supply pipeline, an expansion pipeline, a cooling pipeline and an air cooling assembly, the hot roller is arranged above the soft roller through a rack, the jacking assembly is installed below the soft roller, the side face of the hot roller is communicated with an oil supply pipeline, an expansion pipeline is communicated between the oil supply pipeline and the hot roller, and a cooling pipeline is further arranged between the pipeline and the hot roller. The air cooling assembly is arranged beside the soft roller and is used for carrying out air cooling on the soft roller; according to the calendering machine, the calendering mode that the hot roller and the soft roller are combined is adopted, the soft roller is pushed to squeeze a paper web onto the hot roller through the jacking assembly, the stability of the paper surface is improved through the hot roller, the paper surface is more prone to being pressed and deformed, the contact area between the soft roller and paper is increased, pressure acts on the paper surface with a large area, the tightness is uniform, and the uniformity of the tightness of the paper is ensured.

Description

Technical Field

[0001] This utility model relates to the field of papermaking equipment, specifically to a soft roll calender for balancing paper web tightness. Background Technology

[0002] In the papermaking process, a calender is used to treat the paper surface. The calender mainly consists of an upper roll and a lower roll, both of which have a high degree of surface smoothness. The paper passes between the two rolls, and the upper and lower rolls apply great pressure to the paper surface, making the paper smooth and also increasing the paper's density. If both the upper and lower rolls are hard rolls, the contact area between the rolls and the paper is small, which will cause uneven paper density and large deviations. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a soft roll calender that balances the tightness of the paper web, in order to solve the above-mentioned problems.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a soft roll calender for balancing paper web tightness, comprising a hot roll, a soft roll, a clamping assembly, an oil supply line, an expansion line, a cooling line, and an air-cooling assembly; the hot roll is mounted above the soft roll via a frame, the clamping assembly is mounted below the soft roll, and the telescopic movable end of the clamping assembly is hinged to both sides of the soft roll, the clamping assembly pushes the soft roll toward the hot roll, the side of the hot roll is connected to the oil supply line, the oil supply line is connected to the hot roll via an expansion line, and a cooling line is also provided between the expansion line and the hot roll; the air-cooling assembly is located beside the soft roll and provides air cooling for the soft roll.

[0005] Preferably, the oil supply pipeline includes a main oil tank, a first oil pump, a heater, a second oil pump, an oil inlet pipe, and a first oil return pipe; the first oil pump is connected between the main oil tank and the heater, the second oil pump is disposed on the oil inlet pipe between the heater and the hot roller, and the first oil return pipe is disposed between the hot roller and the heater.

[0006] Preferably, a pressure relief pipe is connected between the first return oil pipe and the oil inlet pipe, and a pressure relief valve is provided on the pressure relief pipe.

[0007] Preferably, the expansion pipeline includes a first expansion pipe connected between the second oil pump and the hot roller, an expansion oil tank disposed at the end of the first expansion pipe, and a second return oil pipe with one end connected to the expansion oil tank and the other end connected to the main oil tank.

[0008] Preferably, the cooling pipeline includes a two-position three-way valve, a heat exchanger, a clean water pipe, a heat exchange tube, a cooler, and a third return oil pipe installed on the oil inlet pipe; one end of the heat exchanger is connected to the two-position three-way valve, and the other end is connected to the oil inlet pipe through the third return oil pipe; one end of the interior of the heat exchanger is connected to the clean water pipe, and the other end is connected to the cooler through the heat exchange tube.

[0009] Preferably, the air-cooling assembly includes a cooler, a ventilation duct, and a plurality of cool air nozzles; the air outlet of the cooler is connected to the ventilation duct, the end of the ventilation duct extends to the side of the soft roller, and the cool air nozzles are disposed at the end of the ventilation duct and face the soft roller.

[0010] Preferably, the clamping assembly is a symmetrically arranged pressure cylinder.

[0011] Preferably, the surface of the soft roller is covered with a flexible layer, and the cold air nozzles are directed toward the flexible layer to cool it with cold air.

[0012] The main technical advantages of this invention are as follows: It employs a calendering method combining a hot roller and a soft roller. A clamping assembly pushes the soft roller to press the paper web onto the hot roller. The hot roller improves paper surface stability, making the paper surface more easily deformed under pressure. The soft roller increases the contact area with the paper, and the pressure acts on a larger area of ​​the paper surface, resulting in uniform density and ensuring consistent paper tightness. Furthermore, a hot oil pump is used to supply oil to the hot roller via an oil supply line, and an expansion line is used to release and collect the heated and expanded oil. After calendering, a cooling line is used to cool the oil supply line, preventing damage due to uneven temperature of the hot roller and extending its service life. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the oil supply pipeline connection;

[0015] Figure 3 This is a schematic diagram of the tensioning assembly and the soft roller.

[0016] The attached diagram is labeled as follows: 1-Hot roller, 2-Soft roller, 3-Tightening assembly, 4-Oil supply line, 41-Main oil tank, 42-First oil pump, 43-Heater, 44-Second oil pump, 45-Oil inlet pipe, 46-First return oil pipe, 47-Pressure relief pipe, 48-Pressure relief valve, 5-Expansion line, 51-First expansion pipe, 52-Expansion oil tank, 53-Second return oil pipe, 6-Cooling line, 61-Two-position three-way valve, 62-Heat exchanger, 63-Clean water pipe, 64-Heat exchange pipe, 65-Cooler, 66-Third return oil pipe, 7-Air-cooled assembly, 71-Air cooler, 72-Ventilation pipe, 73-Air cooler nozzle. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0018] In this embodiment, it should be understood that the terms "middle," "upper," "lower," "top," "right side," "left end," "above," "back," "center," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0019] Furthermore, unless otherwise specified in this specific embodiment, the connection or fixing method between components can be achieved by bolt fixing, pin fixing, or pin connection commonly used in the prior art. Therefore, it will not be described in detail in this embodiment.

[0020] This utility model provides a soft roller calender for balancing paper web tightness, such as... Figure 1-3 As shown, the assembly includes a hot roller 1, a soft roller 2, a clamping assembly 3, an oil supply line 4, an expansion line 5, a cooling line 6, and an air-cooling assembly 7. The hot roller 1 is mounted above the soft roller 2 via a frame. The clamping assembly 3 is installed below the soft roller 2, and its telescopic movable end is hinged to both sides of the soft roller 2. The clamping assembly 3 pushes the soft roller 2 towards the hot roller 1. The side of the hot roller 1 is connected to the oil supply line 4, and the oil supply line 4 is connected to the hot roller via the expansion line 5. A cooling line 6 is also provided between the oil supply line 4 and the hot roller 1. The air-cooling assembly 7 is located beside the soft roller 2 and... The soft roller 2 is cooled by air cooling. A calendering method combining the hot roller 1 and the soft roller 2 is adopted. The soft roller 2 is pushed by the clamping component 3 to squeeze the paper web onto the hot roller 1. The hot roller 1 improves the stability of the paper surface, making the paper surface easier to deform under pressure. The soft roller 2 increases the contact area with the paper. The pressure is applied to a larger area of ​​the paper surface, which makes the density uniform and ensures the uniformity of paper density. Hot oil is pumped to the hot roller through the oil supply line 4. The oil that expands due to heat is depressurized and collected by the expansion line 5. After calendering, the oil supply line 4 is cooled by the cooling line 6 to prevent the hot roller 1 from being damaged due to uneven temperature and to improve its service life.

[0021] Preferably, the oil supply pipeline 4 includes a main oil tank 41, a first oil pump 42, a heater 43, a second oil pump 44, an oil inlet pipe 45, and a first oil return pipe 46. The first oil pump 42 is connected between the main oil tank 41 and the heater 43. The second oil pump 44 is installed on the oil inlet pipe 45 between the heater 43 and the hot roller 1. The first oil return pipe 46 is installed between the hot roller 1 and the heater 43. The first oil pump 42 pumps the oil into the heater 43 for heating, and the second oil pump 44 pumps the hot oil into the hot roller 1. After the cavity inside the hot roller 1 is filled with hot oil, the hot oil is returned to the heater 43 through the first oil return pipe 46 for continuous heating and heat preservation.

[0022] Preferably, a pressure relief pipe 47 is also connected between the first return oil pipe 46 and the oil inlet pipe 45. A pressure relief valve 48 is provided on the pressure relief pipe 47. When the internal oil pressure of the oil inlet pipe 45 is too high, the pressure relief valve 48 is opened, so that the oil flows directly back to the oil tank through the first pipe.

[0023] Preferably, the expansion pipeline 5 includes a first expansion pipe 51 connected between the second oil pump 44 and the hot roller 1, an expansion oil tank 52 disposed at the end of the first expansion pipe 51, and a second return oil pipe 53 with one end connected to the expansion oil tank 52 and the other end connected to the main oil tank 41. When the hot oil in the oil supply pipeline 4 is further heated, it will expand, and the expansion oil tank 52 is used to store the expanded hot oil.

[0024] Preferably, the cooling pipeline 6 includes a two-position three-way valve 61, a heat exchanger 62, a clean water pipe 63, a heat exchange tube 64, a cooler 65, and a third return oil pipe 66, all mounted on the oil inlet pipe 45. One end of the heat exchanger 62 is connected to the two-position three-way valve 61, and the other end is connected to the oil inlet pipe 45 via the third return oil pipe 66. One end of the interior of the heat exchanger 62 is connected to the clean water pipe 63, and the other end is connected to the cooler 65 via the heat exchange tube 64. After the calendering process is completed, the two-position three-way valve 61 is opened, allowing the hot oil to exchange heat with the clean water through the heat exchanger 62 and cool down. The oil then returns to the oil inlet pipe 45 via the third return oil pipe 66, and the cooled hot oil then enters the hot roller 1 to absorb heat and cool down the hot roller 1.

[0025] Preferably, the air-cooling assembly 7 includes a cooler 71, a ventilation duct 72, and a plurality of cool air nozzles 73; the air outlet of the cooler 71 is connected to the ventilation duct 72, the end of the ventilation duct 72 extends to the side of the soft roller 2, and the cool air nozzles 73 are disposed at the end of the ventilation duct 72 and face the soft roller 2. The cooler blows cool air into the ventilation duct 72 through the cooler 71 and sprays it out from the cool air nozzles 73, thereby using the sprayed cool air to cool the surface of the soft roller 2 and prevent the soft roller 2 from absorbing heat and causing the surface temperature to become too high and be damaged.

[0026] Preferably, the clamping assembly 3 is a symmetrically arranged pressure cylinder.

[0027] Preferably, the surface of the soft roller 2 is covered with a flexible layer, and the cold air nozzle 73 cools the flexible layer with cold air.

[0028] The main technical advantages of this invention are as follows: It employs a calendering method combining a hot roller and a soft roller. A clamping assembly pushes the soft roller to press the paper web onto the hot roller. The hot roller improves paper surface stability, making the paper surface more easily deformed under pressure. The soft roller increases the contact area with the paper, and the pressure acts on a larger area of ​​the paper surface, resulting in uniform density and ensuring consistent paper tightness. Furthermore, a hot oil pump is used to supply oil to the hot roller via an oil supply line, and an expansion line is used to release and collect the heated and expanded oil. After calendering, a cooling line is used to cool the oil supply line, preventing damage due to uneven temperature of the hot roller and extending its service life.

[0029] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A soft roll calender for balancing paper web tightness, characterized in that, The system includes a hot roller, a soft roller, a clamping assembly, an oil supply line, an expansion line, a cooling line, and an air-cooling assembly. The hot roller is mounted above the soft roller via a frame. The clamping assembly is installed below the soft roller, and its telescopic movable end is hinged to both sides of the soft roller. The clamping assembly pushes the soft roller toward the hot roller. The side of the hot roller is connected to the oil supply line, and an expansion line is connected between the oil supply line and the hot roller. A cooling line is also provided between the expansion line and the hot roller. The air-cooling assembly is located beside the soft roller and provides air cooling for the soft roller.

2. An equalizing soft roll calender for paper web consistency as claimed in claim 1, characterized in that, The oil supply pipeline includes a main oil tank, a first oil pump, a heater, a second oil pump, an oil inlet pipe, and a first oil return pipe; the first oil pump is connected between the main oil tank and the heater, the second oil pump is located on the oil inlet pipe between the heater and the hot roller, and the first oil return pipe is located between the hot roller and the heater.

3. An equalizing soft roll calender for paper web consistency as claimed in claim 2, characterized in that, A pressure relief pipe is also connected between the first return oil pipe and the oil inlet pipe, and a pressure relief valve is installed on the pressure relief pipe.

4. An equalizing soft roll calender for paper web consistency as claimed in claim 3, characterized in that, The expansion pipeline includes a first expansion pipe connected between the second oil pump and the hot roller, an expansion oil tank disposed at the end of the first expansion pipe, and a second return oil pipe with one end connected to the expansion oil tank and the other end connected to the main oil tank.

5. An equalizing soft roll calender for paper web consistency as claimed in claim 3, wherein, The cooling pipeline includes a two-position three-way valve, a heat exchanger, a clean water pipe, a heat exchange tube, a cooler, and a third return oil pipe installed on the oil inlet pipe; one end of the heat exchanger is connected to the two-position three-way valve, and the other end is connected to the oil inlet pipe through the third return oil pipe; one end of the interior of the heat exchanger is connected to the clean water pipe, and the other end is connected to the cooler through the heat exchange tube.

6. An equalizing soft roll calender for paper web consistency as claimed in claim 3, wherein, The air-cooling assembly includes a cooler, a ventilation duct, and several cool air nozzles; the air outlet of the cooler is connected to the ventilation duct, the end of the ventilation duct extends to the side of the soft roller, and the cool air nozzles are located at the end of the ventilation duct and face the soft roller.

7. An equalizing soft roll calender for paper web consistency as claimed in claim 1, wherein, The clamping assembly consists of symmetrically arranged pressure cylinders.

8. An equalizing soft roll calender for paper web consistency as claimed in claim 6, characterized in that, The surface of the soft roller is covered with a flexible layer, and the cold air nozzles are directed toward the flexible layer to cool it with cold air.

Images