JPH10225707A - Bend amount controlling method of hydraulic bend roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To definitely keep the bend amount of a hydraulic bend roll by automatically regulating so that the sum of a leak flow from the hydraulic bend roll and the by-pass flow to flow in a by-pass tube is made as same as the flow supplied inside the hydraulic bend roll. SOLUTION: The longer the operating time of a hydraulic bend roll A is, the larger an oil leak amount generating inside the hydraulic bend roll A is increased gradually, and the leak amount is returned inside an oil tank 11 through an oil leak piping 15 and a leak side flow measure 16. The leak amount returned inside the oil tank 11 is detected with the leak side flow measure 16, a by-pass oil controlling valve 18 is controlled by using an arithmetic controller 20, and only the leak amount is reduced from the by-pass flow to flow inside a by-pass piping 17. Therefore, the sum of the leak amount and the by-pass flow is always made as same as the flow supplied inside the hydraulic bend roll A, and the bend amount of the hydraulic bend roll A can be kept definitely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an oil leak amount of a hydraulic vent roll used for uniformly contacting the entire surface of a long and wide cloth or a rolled metal plate.

[0002]

2. Description of the Related Art For example, in a rolling process in an ironworks, in order to obtain an iron plate having a uniform thickness, and in a processing industry of a cloth handling a long wide cloth, a processing liquid impregnated in the cloth is applied to the entire cloth. To squeeze it evenly over
The use of vent rolls is well known.

For example, in the process of continuously transferring a long wide cloth, a processing liquid impregnated in the long wide cloth (hereinafter simply referred to as a cloth) is uniformly squeezed over the entire width of the cloth. It is known that the liquid-containing cloth is passed through a pair of squeezing rolls (nip rolls) pressed against each other and squeezed by the squeezing rolls.

However, the length of a squeezing roll used for squeezing a wide cloth having a total width of, for example, as large as 2 m must be a long roll of 2 m or more corresponding to the width of the cloth. As the entire length of the squeezing roll becomes longer, the squeezing roll tends to be bent in the longitudinal direction. In particular, if the pair of bearings supporting both ends of the pair of squeezing rolls are brought close to each other and the pair of squeezing rolls are urged in the pressing direction, the amount of deflection of the squeezing rolls is further increased and the cloth It is not possible to uniformly contact the pressing roll in the entire width direction, and it is impossible to perform uniform pressing over the entire surface of the fabric.

[0005] For this reason, conventionally, a vent roll used in combination with a squeezing roll or a rolling roll in order to suppress deflection of a squeezing roll or the like has been known. As a known vent roll of this type, a taper roll or a crown roll having a constant vent amount is known, but in such a taper roll or the like, since the vent amount is constant, for example, , The outer diameter of the squeezing roll opposed to the taper roll,
It is impossible to adjust the amount of venting to eliminate the warpage due to the change in the contact pressure or the like.

[0006] Therefore, hydraulic vent rolls in which the vent amount of the vent roll can be appropriately adjusted are conventionally known. The configuration of the hydraulic vent roll A is shown in FIGS.
As shown in FIG. 3, the oil supply port 1 and the oil discharge port 2
And an iron tube 5 for forming an oil supply space 4 between the cylindrical core material 3 having both ends and an outer peripheral surface of the core material 3. Bearing 6
It is rotatably supported via. Further, on both ends of the core material between the iron pipe 5 and the core material 3 and on both ends of the iron pipe, respective end face sealing plates 7 for closing both ends of the oil supply space 4 are provided.
Is provided. Further, the oil supply space 4 is formed in a semicircular arc shape as shown in FIG. 3 by a core member between the iron tube and the core member 3 and a shaft seal plate 8 attached at a diameter position of the iron tube. The semicircular space on the opposite side is formed in the oil leak chamber 9 and the oil supply space 4
The oil supply port 1 communicates with the oil leak chamber 9, and the oil discharge port 2 communicates with the oil leak chamber 9.

Reference numeral 10 denotes a rubber layer formed on the outer peripheral surface of the iron tube 5.

In the hydraulic vent roll A having such a configuration, when a predetermined oil pressure is supplied from the oil supply port 1 into the semicircular oil supply space 4, the oil supply space 4
In accordance with the oil supply pressure into the inside, in order to cause the iron pipe 5 portion (the upper half portion in the drawing) corresponding to the semicircular oil supply space 4 to swell, the entire iron tube 5 moves in its axial direction. On the other hand, a warp (vent) occurs in which both ends are inclined downward.

[0009]

The adjustment of the vent amount in the hydraulic vent roll A having the above structure is performed by appropriately measuring the nip amount of the hydraulic vent roll A and the squeezing roll B used opposite to the hydraulic vent roll A, for example. The hydraulic pump pressure can be adjusted so that the value becomes a desired value. However, in the hydraulic vent roll A structure having the above configuration, the oil pumped into the semicircular oil supply space 4 passes through the gap between the iron pipe 5 and the end face seal plate 7 or the shaft seal plate 8 and is thus in the leak chamber 9. The amount of oil leaking into the oil supply space 4 fluctuates due to, for example, the accuracy of manufacturing or assembling the oil seal portion, or the abrasion of the seal portion caused by long-term operation, due to the structure that flows into the oil supply portion. As a result, there is a problem that the hydraulic pressure in the oil supply space 4 fluctuates and the vent amount becomes unstable accordingly.

Further, in order to stabilize the vent amount in the hydraulic vent roll A, the nip value in the squeezing roll is frequently measured, and the hydraulic pressure corresponding to the fluctuation of the nip value is supplied to correct the vent amount. Therefore, there is an inconvenience that the nip value must be frequently measured. Actually, due to this inconvenience, it is difficult to maintain an accurate nip (vent amount) because the measurement of the nip value is performed depending on the feeling of an operator.

The present invention has been made in view of the above. That is, in the present invention, if the amount of oil supplied to the hydraulic vent roll having the above configuration and the amount of oil leaking from the hydraulic vent roll (leak amount) are equal, the amount of hydraulic pressure supplied to the hydraulic vent roll is Paying attention to the fact that the vent amount becomes constant, a bypass pipe is connected to an oil pressurizing pipe connected to the oil supply port of the hydraulic vent roll, and a bypass flow rate discharged from the bypass pipe and a hydraulic vent are connected. The sum with the leak flow rate from the roll is
An object of the present invention is to maintain the vent amount of a hydraulic vent roll constant so as to be equal to the discharge amount from a pump.

[0012]

In order to achieve the above object, according to the present invention, a bypass pipe connected to an oil pressurizing pipe which communicates a discharge port of a hydraulic pump and an oil supply port of a hydraulic vent roll is provided. The flow rate of the bypass flow is measured by a bypass flow meter, the leak flow rate from the hydraulic vent roll is measured by a leak flow meter, and the leak flow rate measured by the leak flow meter is reduced from the bypass flow rate. Further, a vent amount control method of the hydraulic vent roll is automatically adjusted so that the sum of the leak flow rate and the bypass flow rate becomes equal to the flow rate supplied into the hydraulic vent roll.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in FIG.

In FIG. 1, A is a hydraulic vent roll, and the configuration of the hydraulic vent roll A is the same as the configuration described with reference to FIGS. B denotes a squeezing roll that is brought into contact with the hydraulic vent roll A. An oil tank 11 is filled with oil to be supplied to the hydraulic vent roll A. The oil tank 11 is connected to a suction port of an oil circulation pump 12. An oil pressure reducing valve 13 is connected to the discharge port. The oil pressure reducing valve 13 is connected to the oil supply port 1 of the hydraulic vent roll A via an oil pressurizing pipe 14.

An oil discharge pipe 15 is connected to the oil discharge port 2 provided in the hydraulic vent roll A. The oil leak pipe 15 is connected to a leak side flow meter 16.
Is connected to the inside of the oil tank 11. A bypass oil control valve 18 and a bypass-side flow meter 1 connected to an outflow side of the oil control valve 18 are provided in a bypass pipe 17 branched from the oil pressurizing pipe 14.
9 and connected to the inside of the oil tank. Reference numeral 20 denotes an arithmetic controller which receives flow signals from the leak-side flow meter 16 and the bypass-side flow meter 19 to control the degree of opening and closing of the bypass oil control valve 18, and 21 denotes an oil pressure gauge.

Next, the operation will be described. First, in order to vent the hydraulic vent roll A, the oil circulation pump 12 is driven, and a hydraulic pressure of a predetermined pressure is supplied into the hydraulic vent roll A by the operation of the oil pressure reducing valve 13. Then, in the hydraulic vent roll A, a desired vent amount is obtained. If the supply oil pressure in the hydraulic vent roll A at this time is maintained constant, the vent amount of the hydraulic vent roll A is also maintained constant. Leakage occurs at the end face seal plate 7 and the shaft seal plate 8 provided between the core member 3 on the side and the iron pipe 5 on the movable side, and the vent amount of the hydraulic vent roll A changes due to this. become.

Therefore, in the present embodiment, when starting to use the hydraulic vent roll, first, the bypass flow rate flowing in the bypass space 17 branched from the oil pressurizing pipe 14 is set to an arbitrary flow rate at an arbitrary pressure. Next, the arithmetic controller 20 sets the sum of the flow rate flowing through the oil pressurizing pipe 14 and the flow rate flowing through the oil leak pipe 15 at this time.

Next, when the operation of the oil circulation pump 12 is started to vent the hydraulic vent roll A, a desired hydraulic pressure is supplied into the hydraulic vent roll A, and a desired amount of vent is generated in the hydraulic vent roll. As the operation of the hydraulic vent roll A elapses for a long time, the amount of oil leak generated in the hydraulic vent roll A gradually increases, and the amount of leak is determined by the oil leak pipe 15 and the leak-side flow meter 16.
And is returned into the oil tank 11.

Therefore, in the present embodiment, the amount of leak returned to the oil tank 11 is detected by the leak side flow meter 16, and based on the detected value, the bypass oil control valve 18 is operated by the arithmetic controller 20. Is controlled to reduce only the amount of leak from the bypass flow rate flowing through the bypass pipe 17.

As a result, the sum of the leak flow rate and the bypass flow rate always becomes equal to the flow rate supplied into the hydraulic vent roll A, whereby the vent amount of the hydraulic vent roll A can be kept constant. .

As described above, in the present embodiment, the bypass control valve is controlled via the arithmetic and control unit 20 on the basis of the flow signals from the leak side flow meter 16 and the bypass side flow meter 19. With this configuration, the leak side flow meter detects the amount of leakage leaked from the hydraulic vent roll A, reduces the same amount as the leak amount from the bypass flow rate, and determines the sum of the leak flow rate and the bypass flow rate by the hydraulic vent roll. A is equal to the flow rate supplied into the hydraulic vent roll A.
Can always be kept constant.

[0022]

As described above, according to the present invention, in a pressurizing device using a hydraulic vent roll, for example, a cloth or an iron plate, the amount of vent by the hydraulic vent roll can be constantly (stable). Thus, the uniformity of the pressure treatment can be improved. Further, according to the present invention, since the stable control of the vent amount can be automatically performed,
Labor saving and economic efficiency are improved, and continuous operation for a long time becomes possible, so that productivity is also improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a vent amount control method according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a hydraulic vent roll used in the present invention.

FIG. 3 is a longitudinal sectional view of a hydraulic vent roll used in the present invention.

[Explanation of symbols]

A ... Hydraulic vent roll B ... Squeeze roll 11 ... Oil tank 12 ... Oil circulation pump 13 ... Oil pressure reducing valve 14 ... Oil pressurizing pipe 15 ... Oil leak pipe 16 ... Leak side flow meter 17 ... Bypass pipe 18 ... Bypass oil control Valve 19: Bypass-side flow meter 20: Operation controller 21: Oil pressure gauge

Claims (1)

[Claims] 1. A bypass flow meter for measuring a bypass flow rate flowing through a bypass pipe connected to an oil pressurizing pipe connecting a discharge port of a hydraulic pump and an oil supply port of a hydraulic vent roll. The leak flow rate from the roll is measured by a leak flow meter, and the same amount as the leak flow rate measured by the leak flow meter is reduced from the bypass flow rate. A method for controlling the amount of vent of a hydraulic vent roll, wherein the amount is automatically adjusted so as to be equal to the flow rate supplied to the hydraulic vent roll.