JP4997049B2 - Hot water supply device for stock inlet deflection correction of paper machine - Google Patents

Description

  In order to stably supply hot water for correcting the deflection of a stock inlet that supplies a papermaking raw material to a wire part of a paper machine, even when the paper machine is in operation, the hot water in a correction hot water tank is used. The present invention relates to an apparatus for supplying hot water for correcting the stock inlet deflection of a paper machine which can be replenished to the hot water tank for correction in a reduced state.

  In a paper machine, a paper-making raw material in which pulp is melted in water is sprayed from a slice lip of a stock inlet onto a net-like wire that is endlessly circulating and a paper layer is formed on the wire. The flow rate and the like are adjusted so that the papermaking raw material injected from the slice lip is formed with a uniform thickness without being biased in the width direction of the wire. For this reason, it is necessary to correct the deflection due to the temperature of the stock inlet body and the deflection due to its own weight, and hot water is supplied to the stock inlet chamber for this correction. If the supply of hot water is insufficient, the amount of deflection of the stock inlet will increase, the slice lip will be deformed, the flow rate balance will be lost, the paper layer that will be formed will be uneven, and the paper may break. is there. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 59-211165) discloses a thermal stabilization system for a head box including an outer wall that is heated to the same temperature as an inner wall that is in contact with a papermaking raw material. A heat stabilization system for a head box of a paper machine is disclosed in which the outer wall is heated to a temperature equal to that of the inner wall by heating the wall so that there is no difference in thermal expansion between both walls.

  FIG. 5 is a perspective view showing a schematic structure of the stock inlet 1, and is configured by a casing that is appropriately longer than the width of the wire 2 to which the papermaking raw material is supplied. A slice lip 4 is disposed at a portion of the stock inlet 1 facing the wire 2, and a papermaking raw material is sprayed from the slice lip toward the wire 2. A chamber 5 is disposed on the upper side of the stock inlet 1, and correction hot water is supplied to the chamber 5. A proximity sensor 6 is provided at the center of the top lip frame 4a constituting the slice lip 4. On the other hand, a steel wire 7 is stretched above the slice lip 4, and the proximity sensor 6 measures the distance to the steel wire 7. The hot water for correction is supplied from the hot water tank for correction 8 to the chamber 5, and the hot water for correction that has passed through the chamber 5 is returned to the hot water tank for correction 8 by the circulation pump 9. It circulates between the hot water tank 8 for correction. The hot water tank for correction 8 is provided with a heater 8a, and the hot water for correction in the hot water tank for correction 8 is heated. Further, a temperature sensor 10a is attached to the correction hot water tank 8, and the temperature controller 10 controls the heater 8a based on the temperature in the correction hot water tank 8 detected by the temperature sensor 10a. Hot water is adjusted to the desired temperature. The temperature set in the correction hot water at this time is adjusted according to the distance from the steel wire 7 measured by the proximity sensor 6. That is, the distance from the top lip frame 4a to the steel wire 7 is equal at any position when the top lip frame 4a is not bent, and when the deflection is generated, the distance to the steel wire 7 is It differs at the end and the center. By inputting the change in the distance to the temperature controller 10, the temperature of the correction hot water is adjusted by intermittently energizing the heater 8a.

  FIG. 6 is a schematic system diagram of a system for supplying hot water for correction to the chamber 5 of the stock inlet 1. An air pipe 11 is connected to the correction hot water tank 8 that stores the correction hot water, and pressurized air is supplied to pressurize the correction hot water tank 8. For this reason, pressurized hot water is supplied to the chamber 5. Further, a funnel 12 is communicated with the correction hot water tank 8, and the correction hot water can be replenished from the funnel 12.

  When the paper machine is in operation, the circulation pump 9 is driven and pressurized air is supplied from the air pipe 11 to circulate the pressurized hot water for correction between the chamber 5 and the hot water tank 8 for correction. . Therefore, the air valve 11a provided in the air pipe 11 and the circulation valve 8b provided in the pipe extending from the correction hot water tank 8 to the chamber 5 are opened, and the funnel 12 supplies the correction hot water tank 8 to the correction water hot tank 8. The replenishing valve 12a provided in the pipe to reach is closed.

  By the way, since the slicing lip 4 is bent, it is allowed to be deformed to some extent. For this reason, the structure which accept | permits this deformation | transformation is employ | adopted. FIG. 7 shows a structure for this purpose, (a) is a view showing the peripheral wall surface of the chamber 5, and (b) is a cross-sectional view taken along the line BB in (a). As shown in FIG. 2B, a rubber sheet 13 is stretched between the upper plate 5a and the lower plate 5b of the chamber 5 on the peripheral wall surface of the chamber 5, and the upper plate 5a and the lower plate 5b are fixed. And change of position is allowed.

  As described above, the peripheral wall surface of the chamber 5 is connected by the rubber sheet 13 to allow the chamber 5 to bend. If the rubber sheet 13 is in close contact with the peripheral wall surface of the chamber 5, no problem occurs. However, since the rubber sheet 13 is deformed, a gap is formed in the close contact portion, and correction hot water is supplied from the gap. Leak. In particular, since pressurized hot water for correction is supplied into the chamber 5, it is difficult to reliably prevent the hot water for correction from leaking.

  When the level of the correction hot water in the correction hot water tank 8 decreases due to leakage from the chamber 5 and the correction hot water is insufficient, it is necessary to supply the correction hot water. In this case, as shown in FIG. 4, the circulation pump 9 is stopped, the air valve 11a and the circulation valve 8b are closed, and the circulation of the correction hot water is stopped. Next, the replenishing valve 12 a is opened, and replenishing water such as distilled water is supplied from the funnel 12 to the correction hot water tank 8. During this time, since the supply of the correction hot water to the chamber 5 is stopped, the stock inlet 1 is bent and the slice lip 4 is deformed, so that the paper layer is not sufficiently formed. Therefore, it is necessary to stop the paper machine. When the correction hot water supply is completed, the supply valve 12a is closed, the air valve 11a and the circulation valve 8b are opened, the circulation pump 9 is operated, and pressurized air is supplied.

  As described above, when the water level in the correction hot water tank 8 decreases and the correction hot water is supplied, it is necessary to stop the paper machine. If the paper machine is not stopped, the correction hot water must be circulated between the correction hot water tank 8 and the chamber 5 in a continuous manner. In the state where the correction hot water is circulated, since the pressurized air is supplied, the correction hot water tank 8 is at a positive pressure. Therefore, when the replenishment valve 12a is opened, the correction hot water becomes the correction hot water tank 8. It is not possible to supply hot water for replenishment by flowing back to the funnel 12. Further, the hot water for correction is not supplied to the chamber 5 and the stock inlet 1 may bend.

  Therefore, the present invention provides a stock of a paper machine that makes it possible to supply hot water for correction without stopping the paper machine when the amount of hot water for correction for suppressing the deflection of the stock inlet is reduced. An object of the present invention is to provide a hot water supply device for correcting inlet deflection.

  As a technical means for achieving the above object, a hot water supply device for correcting stock inlet deflection of a paper machine according to the present invention supplies pressurized air into a hot water tank for correction and pressurizes the hot water tank for correction. In the supply device for the stock inlet deflection correction hot water of the paper machine, which adjusts the deflection of the stock inlet by supplying the correction hot water from the chamber to the correction hot water tank and circulating it from the chamber to the correction hot water tank. A cushion tank communicated with each of the correction hot water tank and the funnel, and a communication between the cushion tank and the correction hot water tank between the correction hot water tank and the funnel for supplying makeup water. And a refilling valve for intermittent communication between the funnel and the cushion tank. An air vent pipe that communicates the inside of the cushion tank with the atmosphere, an air vent valve that opens and closes the air vent pipe to intermittently connect the cushion tank and the atmosphere, and a cushion that communicates the cushion tank and the flow path of the pressure air It has a tank pressurizing pipe and a communication valve for opening and closing the cushion tank pressurizing pipe.

  When the correction hot water is supplied, the supply water is supplied to the cushion tank in a state where the operation of the correction hot water circulation system is continued. At this time, the cushion valve is closed and the air vent valve is opened. The replenishing valve is opened and the communication valve is closed so that pressurized air is not supplied to the cushion tank. In this state, since the air in the cushion tank is released to the atmosphere through the air vent valve, makeup water can be injected into the cushion tank.

  When the replenishment water has been injected into the cushion tank, the replenishment valve and the air vent valve are closed. Next, the cushion valve is opened after the communication valve is opened. As a result, the cushion tank and the correction hot water tank communicate with each other. Further, pressurized air is supplied to the cushion tank, so that the internal pressure of the cushion tank is equal to the internal pressure of the correction hot water tank. As a result, makeup water flows from the cushion tank into the correction hot water tank and is supplied to the correction hot water tank.

  When the replenishment to the correction hot water tank is completed, the cushion valve and the communication valve are closed. As a result, a circulation path from the correction hot water tank to the stock inlet chamber is formed as a closed system.

  According to a second aspect of the present invention, there is provided a water supply device for correcting stock inlet deflection of a paper machine. When supplying makeup water from the cushion tank to the hot water tank for correction, the internal pressures of the cushion tank and the hot water tank for correction are as follows. Is characterized by equality.

  That is, when supplying makeup water from the cushion tank to the correction hot water tank, the supplement valve and the air vent valve are closed, and the cushion valve is opened after the communication valve is opened. Thus, the cushion tank and the correction hot water tank communicate with each other, pass through the communication valve, and pressurized air is supplied to both the cushion tank and the correction hot water tank. For this reason, the respective internal pressures of the cushion tank and the correction hot water tank are equal. Accordingly, the supply of makeup water from the cushion tank to the correction hot water tank is performed by a pressure difference corresponding to the head difference between the cushion tank and the correction hot water tank.

  According to the apparatus for supplying hot water for correcting the stock inlet deflection of the paper machine according to the present invention, the hot water for correction is supplied with the hot water for correction while the circulation between the hot water tank for correction and the chamber is continued. can do. For this reason, it can carry out without stopping a paper machine, and does not inhibit paper productivity.

  Also, according to the stock inlet deflection correction hot water supply device of the paper machine according to the invention of claim 2, since the supply of makeup water from the cushion tank to the correction hot water tank is due to a pressure difference corresponding to these head differences, Makeup water can be supplied stably. In addition, since there is no differential pressure between the cushion tank and the hot water for correction, the circulation of the hot water for correction from the hot water tank for correction to the chamber is stable. There is no loss of conversion.

  Hereinafter, based on a preferred embodiment shown in the drawings, a stock inlet deflection correction hot water supply device for a paper machine according to the present invention will be described in detail.

  FIG. 1 shows a piping system of a hot water supply device for stock inlet deflection correction of a paper machine according to the present invention. The same parts as those of the conventional piping system shown in FIG. is there. The open / closed state of the valve shown in FIG. 1 indicates a state during operation. A cushion tank 21 is communicated with the correction hot water tank 8 via a cushion valve 21a. The cushion tank 21 is disposed higher than the correction hot water tank 8 so that the correction hot water flows from the cushion tank 21 to the correction hot water tank 8. The funnel 12 communicates with the cushion tank 21 via a refill valve 12a.

  An air vent pipe 22 is connected to the cushion tank 21, and an air vent valve 22a is provided so that the state where the interior of the cushion tank 21 communicates with the atmosphere and the state where the atmosphere is shut off are changed by opening and closing. It is. Further, a cushion tank pressurizing pipe 23 is branched from the air pipe 11, and the cushion tank pressurizing pipe 23 is the air vent pipe 22 and is connected to a portion between the air vent valve 22a and the cushion tank 21. Thus, the air pipe 11 and the cushion tank 21 are communicated with each other. The cushion tank pressurizing pipe 23 is provided with a communication valve 23a so that the cushion tank pressurizing pipe 23 can be opened and closed.

  The operation procedure of the stock water supply device for correcting the stock inlet deflection of the paper machine according to the present invention configured as described above will be described below.

  As shown in FIG. 2, when water leaks from the chamber 5 and the water level of the correction hot water tank 8 falls to a position where there is a possibility that the deflection correction of the stock inlet 1 cannot be sufficiently performed, the correction hot water Need to be replenished. In this case, hot water for correction is supplied to the cushion tank 21. The cushion valve 21a is closed, and the refill valve 12a and the air vent valve 22a are opened. In this state, makeup water S is supplied to the funnel 12 for correction hot water such as distilled water. The supplied makeup water S flows into the cushion tank 21 and is stored because the air vent valve 22a is opened and the inside of the cushion tank 21 communicates with the atmosphere.

  If the replenishing water S is stored in the cushion tank 21, the replenishing valve 12a and the air vent valve 22a are closed as shown in FIG. 3, and the cushion valve 21a is opened after the communication valve 23a is opened. When the cushion valve 21a is opened, the replenishing water S in the cushion tank 21 can flow into the correction hot water tank 8, and in this state, pressurized air is supplied to the cushion tank 21 by opening the communication valve 23a. The inside of the cushion tank 21 is pressurized. As a result, the internal pressure of the cushion tank 21 and the internal pressure of the correction hot water tank 8 become equal, so the makeup water S flows from the cushion tank 21 into the correction hot water tank 8. For this reason, the supply water S for the correction hot water that has been insufficient is supplied to the correction hot water tank 8 so that the water level in the correction hot water tank 8 rises and does not interfere with the deflection correction of the stock inlet 1. The hot water for correction can be supplied to the chamber 5.

  When the supply of the replenishing water S from the cushion tank 21 to the correction hot water tank 8 is completed, the cushion valve 21a and the communication valve 23a are closed, the air vent valve 22a is opened, and the next refilling operation is awaited. . The air vent valve 22a is preferably closed in a state where the pressurized air from the cushion tank 21 has been released.

  The correction hot water replenishment operation described above can be performed in a state in which the circulation of the correction hot water between the correction hot water tank 8 and the chamber 5 is continued while the circulation pump 9 is operated. . Therefore, the correction hot water can be replenished without stopping the paper machine.

  By the way, as indicated by an imaginary line in FIG. 1, the cushion tank pressurizing pipe 23 for supplying the pressurized air to the cushion tank 21 is further branched, and the air pipe 11 is branched upstream of the air valve 11a. A cushion tank pressurizing pipe 23p can also be added. The cushion tank pressurizing pipe 23p is provided with a sub-communication valve 23r arranged in parallel with the communication valve 23a.

  In the case of this piping path, when supplying the supplementary water S stored in the cushion tank 21 to the hot water tank 8 for correction, the auxiliary communication valve 23r is opened to supply pressurized air to the cushion tank 21, It is also possible to close the air valve 11a and the communication valve 23a to stop the supply of pressurized air to the correction hot water tank 8. In this case, the internal pressure of the cushion tank 21 becomes higher than the internal pressure of the correction hot water tank 8, and the makeup water S in the cushion tank 21 is forced into the correction hot water tank 8. For example, when the hot water tank for correction 8 is quickly filled before the start of operation, or when the water level in the hot water tank for correction 8 is abnormally lowered and the hot water for correction is quickly supplied. It is effective as an emergency response. In this case, the pressure in the correction hot water tank 8 may fluctuate, and the stable supply of the correction hot water to the chamber 5 of the stock inlet 1 may be impaired. It is preferable to process by this operation only in an emergency.

  According to the apparatus for supplying hot water for correcting the stock inlet deflection of the paper machine according to the present invention, the hot water for correcting the stock inlet can be replenished while the paper machine is continuously operated. Contributes to stable operation without reducing production efficiency.

It is a figure which shows the piping system provided with the hot water supply apparatus for stock inlet deflection correction | amendment of the paper machine which concerns on this invention, and has shown the state with which hot water for correction | amendment is satisfied. It is a figure explaining the state which the hot water for correction | amendment runs short, and water for correction | amendment is poured into a cushion tank. It is a figure explaining the state which is supplying the correction | amendment warm water to the correction | amendment warm water tank. It is a figure explaining the state which supplies the warm water for correction | amendment in the conventional case. It is a figure which shows schematic structure for correct | amending the deflection | deviation of a stock inlet, and has shown the relationship between a stock inlet and a wire. It is a figure explaining the piping system of the correction | amendment hot water for the deflection correction of a stock inlet. It is a figure explaining the structure where water leaks from the chamber supplied with the hot water for deflection correction, (a) is a diagram showing the peripheral wall surface of the chamber, (b) is a cross section cut along the line BB in (a) FIG.

Explanation of symbols

1 Stock inlet 2 Wire 4 Slice lip 5 Chamber 8 Correction hot water tank
8a heater
8b Valve for circulation 9 Circulation pump
11 Air piping
11a Air valve
12 Funnel
12a Supply valve
21 Cushion tank
21a Cushion valve
22 Air vent piping
22a Air vent valve
23 Cushion tank pressure piping
23a Communication valve S Make-up water

Claims (2)

Supplying pressurized air into the correction hot water tank to pressurize, supplying the correction hot water from the correction hot water tank to the stock inlet chamber, and circulating from the chamber to the correction hot water tank by a circulation pump, In the hot water supply device for correcting the stock inlet deflection of the paper machine that adjusts the deflection of the stock inlet,
Between the hot water tank for correction and the funnel for supplying makeup water, a cushion tank communicated with each of the hot water tank for correction and the funnel;
A cushion valve for intermittently communicating between the cushion tank and the correction hot water tank;
A refill valve for intermittently communicating between the funnel and the cushion tank;
An air vent pipe for communicating the inside of the cushion tank and the atmosphere;
An air vent valve that opens and closes the air vent pipe to intermittently connect the cushion tank and the atmosphere;
A cushion tank pressurizing pipe communicating the cushion tank and the flow path of the pressurized air;
An apparatus for supplying hot water for correcting a stock inlet deflection of a paper machine, comprising a communication valve for opening and closing the cushion tank pressurizing pipe.   2. The stock inlet deflection correction hot water supply device according to claim 1, wherein when the makeup water is supplied from the cushion tank to the correction hot water tank, the internal pressures of the cushion tank and the correction hot water tank are equalized. .

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