JP3289185B2 - Heating and cooling device for rolls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a roll (also referred to as a roller or a drum) having a temperature of less than 100.degree.
The present invention relates to a roll heating / cooling apparatus for controlling the temperature in a range of not less than ° C.

[0002]

2. Description of the Related Art In an apparatus for casting a film, an endless steel belt for casting is stretched with a roll, and the steel belt is heated at a temperature lower than 100 ° C. to 1 °.
Some rolls are heated and cooled so as to adjust to a set temperature within a range of 00 ° C. or more. A conventional roll heating / cooling device provided for heating / cooling the roll is configured to supply a heat-regulated heat medium oil to a heat exchange channel formed in the roll.

[0003]

However, in a heating / cooling apparatus for a roll using a heating medium oil, when the heating medium oil leaks, there is a danger of a fire explosion due to the heating medium oil in a high temperature state, and a casting apparatus is installed. Therefore, there is a problem that the cleanliness in the factory, which requires a high cleanliness, is significantly reduced. Further, the heat transfer medium oil may not be able to heat or cool the roll quickly and uniformly due to poor heat transferability. Therefore, an object of the present invention is to provide a heating and cooling device for a roll using water as a heat medium in order to solve the above problem.

[0004]

The roll is heated and cooled by using water as a heat medium , and circulating water per unit time is provided.
Means adopted by the present invention for uniformly heating or cooling the roll by increasing the amount thereof is provided in the middle of the circulation channel, a heat exchange passage for the roll, a circulation pump, and a heat exchanger for heating. the secondary side of the secondary side and the cooling heat exchanger disposed in, a b Lumpur for heating and cooling device connected to the discharge side of the supply pressure water pump to water circulation passage, the heating heat exchanger two Secondary inflow
A bypass water passage connecting the mouth side and the outlet side, and the cooling
The inlet and outlet on the secondary side of the heat exchanger
That is, a bypass waterway was provided. In the present invention, since the circulating water flowing through the circulating water channel can be pressurized to 1 atm or more by the pressurized water supply pump, the circulating water passing through the secondary side of the heating heat exchanger is heated to 100 ° C or more. Circulating water to the heat exchange water passage of the roll while cooling the circulating water passing through the secondary side of the heat exchanger for cooling to less than 100 ° C. Can be. The heat transfer property of the circulating water is better than that of the heat transfer oil, so the roll can be heated or cooled quickly and uniformly, and even if the circulating water leaks, there is no danger of flaming explosion and the cleanliness Is not significantly reduced. Furthermore,
In the present invention, the circulating water is used for a heating heat exchanger and a cooling heat exchanger.
It passes through each secondary side of the heat exchanger and each bypass channel.
Therefore, without reducing the amount of circulating water per unit time,
Pass a large amount of circulating water through the heat exchange passage
Can be uniformly heated or cooled.

A roll is heated and cooled using water as a heat medium.
To prevent circulating water temperature fluctuations caused by water pressure fluctuations.
Means adopted by the present invention according to claim 2 is a
In the middle of the waterway, a heat exchange waterway for rolls, a circulation pump,
Connect the secondary side of the heating heat exchanger and the secondary side of the cooling heat exchanger.
That connects the discharge side of the pressurized water supply pump to the circulation channel.
A heating and cooling device for the water supply, wherein
A pressure regulating valve is connected to the outlet side to circulate through the circulation channel.
Operate the circulating pump in a condition where the temperature of water is 100 ° C or higher.
During the operation, operate the pressurized water supply pump
It was done. In the present invention, the water flows through the circulation channel.
Circulating water can be pressurized to 1 atm or more with a pressurized water supply pump.
Circulating water passing through the secondary side of the heating heat exchanger
Heat to above ℃ and circulate through the heat exchange water passage of the roll
And pass through the secondary side of the cooling heat exchanger
The circulating water is cooled to less than 100 ° C and the heat exchange of the rolls
It can be circulated to the irrigation canal. Heat transfer of circulating water
Can be rolled quickly and uniformly
Can be heated or cooled, and circulating water leaks
Even if there is no danger of ignition explosion, the cleanliness level is remarkable
There is no lowering. Further, according to the present invention,
Since the water pressure set by the pressure control valve is constantly applied to the water,
Temperature fluctuation of circulating water due to pressure fluctuation can be eliminated
You.

In order to prevent the temperature fluctuation of the circulating water due to the water pressure fluctuation, the means adopted by the present invention is to connect a pressure regulating valve to the discharge side of the pressurized water supply pump, and to connect the circulating water passage to the pressure regulating valve. the middle of the circulating water flow is driving the circulating pump in a state to be 100 ° C. or higher, the is roll heating and cooling device according to claim 1, wherein so as to operate the supply pressure water pump. In the present invention, since the water pressure set by the pressure regulating valve is constantly applied to the circulating water, the temperature fluctuation of the circulating water due to the fluctuation of the water pressure can be eliminated.

[0007] means for the present invention is employed according to claim 4, wherein in order to not issue out of the apparatus the circulation water, also claim 2
4. The heating / cooling device for a roll according to claim 3 , wherein a suction side of the pressurized water supply pump is connected to a water supply tank, a safety valve is connected to the circulating water channel, and each drain side of the safety valve and the pressure control valve is connected to the water supply tank. Is connected .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a roll heating / cooling apparatus according to the present invention will be described based on an embodiment shown in the drawings.

The heating / cooling device 1 for a roll is provided with a roll (also referred to as a roller or a drum) in the middle of the circulation channel 2.
3 is provided with a heat exchange water passage 3a, a circulation pump 4, a secondary side 5a of a heating heat exchanger 5 and a secondary side 6a of a cooling heat exchanger 6, and discharges a pressurized water supply pump 7 into the circulation water passage 2. Side 7a is connected. The roll 3 is an endless steel belt 8 for casting a synthetic resin film or the like.
Is stretched by a pair with a roll (not shown) of the other party, and is forcibly driven or rotated following the running of the belt 8. Running steel belt 8
Is cooled or heated in a process before reaching the roll 3,
When the roll 3 contacts the roll 3 in this state, the roll 3 heats or cools the roll 3 to a predetermined temperature. The roll 3 forms a heat exchange water passage 3a inside, and is heated or cooled by the temperature adjusting circulating water passing through the heat exchange water passage 3a, so that the temperature of the outer peripheral surface 3b of the steel belt 8 is increased. The temperature is set to a temperature suitable for heating or cooling (for example, 50 to 130 ° C.). The rotating roll 3 is connected to the pipe 2 of the circulation waterway 2.
A water exchange passage 3a for heat exchange is connected to a through a rotary joint 9 for piping.

The heating heat exchanger 5 is provided with a heat exchanging section comprising a pipe or the like serving as a primary side 5b inside a pressure vessel serving as a secondary side 5a, and a steam passing through the heat exchanging section on the primary side 5b. The circulating water is heated by exchanging heat with the circulating water passing through the pressure vessel on the secondary side 5a. In addition, the cooling heat exchanger 6 is provided with a heat exchange section including a pipe or the like serving as a primary side 6b inside a pressure vessel serving as a secondary side 6a, and a cooling water passing through the heat exchange section on the primary side 6b. The circulating water is cooled by exchanging heat with the circulating water passing through the pressure vessel on the secondary side 6a. Either of the locations where the heating heat exchanger 5 and the cooling heat exchanger 6 are provided in the circulating water channel 2 may be on the upstream side. The heating heat exchanger 5 and the cooling heat exchanger 6 are provided on the discharge side 4 a of the circulation pump 4, but may be provided on the suction side 4 b of the circulation pump 4.

The heating heat exchanger 5 and the cooling heat exchanger 6 are provided with bypass water passages 5c, 6c connecting the inlets and outlets of the secondary sides 5a, 6a, respectively. The amount of circulating water is increased. When the amount of circulating water passing through the internal heat exchange water passage 3a increases, the roll 3 quickly or uniformly heats or cools the entire outer peripheral surface 3a. Each of the bypass water passages 5c and 6c is provided with a flow control valve 12 so that the amount of water passing through the bypass water passages 5c and 6c can be adjusted.

The circulating water passage 2 is provided with a temperature control device 1 at a location downstream of the heating heat exchanger 5 and the cooling heat exchanger 6.
A temperature detector 11 of 0 is provided to detect the temperature of the circulating water heated or cooled after passing through the heat exchanger 5 for heating and the heat exchanger 6 for cooling. The heating heat exchanger 5 and the cooling heat exchanger 6 are provided with flow control valves (temperature control valves) 13 and 14 of the temperature control device 10 on the respective primary sides 5b and 6b. When the temperature controller 10 outputs the temperature detected by the temperature detector 11 to the temperature controller 12, the temperature controller 12 issues a command based on the difference between the set temperature and the detected temperature to the flow control valve 13,
14 and the temperature of the circulating water supplied to the roll 3 is set to the set temperature.

The pressurized water supply pump 7 has a discharge side 7a connected to a portion of the circulating water channel 2 which is the suction side 4b of the circulating pump 4. The pressurized water supply pump 7 includes a check valve 15 for preventing backflow toward the pump 7, a pressure control valve 16 for setting a pressure of water supplied to the circulating water passage 2, and a water supply tank 17. The waterway 18 is formed. The water supply tank 17 includes a tank body 18, a ball tap 19 for maintaining a constant water level WL in the tank, and an overflow pipe 2.
0. The pressure control valve 16 is connected to the drain side.
It is connected to the tank body 18 of the water supply tank 17. When the circulating pump 4 is operated in a state where the circulating water is 100 ° C. or higher, the pressurized water supply pump 7 is always operated to secure a minimum necessary water pressure according to the temperature of the circulating water,
The temperature fluctuation of the circulating water due to the water pressure fluctuation is prevented.

The circulating water channel 2 is provided with a safety valve 19 at a position near the inflow side of the roll 3 so as to prevent the pressure from rising above the dangerous pressure. The safety valve 19 connects the drainage channel side 19a to the inside of the tank body 18 of the water supply tank 17 so as to prevent circulating water leaking from the circulating water channel 2 from flowing out of the device. The circulation channel 2 is provided with an air vent valve 20 at an appropriate position so that air does not enter the channel. This is because the heat conductivity is extremely different between water and air, so that air is eliminated to ensure stable heat exchange capacity of the circulating water.

The heating / cooling device 1 for a roll can pressurize the circulating water flowing in the circulating water channel 2 to 1 atm or more by a pressurized water supply pump 7, so that the circulating water passing through the secondary side 5 a of the heating heat exchanger 5 Can be heated to 100 ° C. or higher and circulated to the heat exchange water passage 3 a of the roll 3. Further, the roll heating / cooling device 1 can cool the circulating water passing through the secondary side 6 a of the cooling heat exchanger 6 to less than 100 ° C. and circulate the circulating water to the heat exchange water passage 3 a of the roll 3. . Furthermore, the heating / cooling device 1 for a roll can also raise or lower the temperature of the circulating water continuously or stepwise between less than 100 ° C. and 100 ° C. or more. The circulating water can heat or cool the roll 3 quickly and uniformly because the heat transfer property is better than that of the heat transfer oil, and furthermore, even if it leaks, there is no danger of flaming explosion and the cleanliness level is improved. There is no significant reduction.

The roll 3 of the roll heating / cooling apparatus 1
The present invention is not limited to the method in which the endless steel belt 8 is stretched, but is applied to a method in which a sheet such as a synthetic resin film or a metal foil is guided while being in contact with the outer peripheral surface 3a, and the sheet is heated or cooled. Of course, it is also possible.

[0017]

According to the first , second and third aspects of the present invention, the temperature of the roll is controlled by circulating pressurized water having a better heat transfer property than the heat transfer medium oil to the roll heat exchange passage. The roll can be heated or cooled quickly and uniformly, and even if the circulating water leaks, there is no danger of a fire explosion and there is an excellent effect that the cleanliness in the factory is not significantly reduced. The present invention according to claim 1 and 3, wherein, by passing a large amount of the circulating water to the heat exchanger for water passage of the roll, can be uniformly heated or cooled rolls. The device according to claims 2 and 3 is
Stable temperature control can be achieved without fluctuation of circulating water temperature due to fluctuation of water pressure. The device according to the fourth aspect of the present invention provides a circulation device.
Water can be kept out of the device.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing an embodiment of a roll heating / cooling apparatus according to the present invention.

[Explanation of symbols]

2. Circulating water channel, 3 ... Roll, 3a ... Heat exchange water channel, 4
... Circulation pump, 5 ... Heat exchanger for heating, 5a ... Secondary side, 5
c: bypass water passage, 6: heat exchanger for cooling, 6a: secondary side, 6c: bypass water passage, 7: pressurized water supply pump, 7a ...
Discharge side, 16 ... Pressure control valve

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16C 13/00-15/00 B29C 35/00-35/18

Claims (4)

(57) [Claims] 1. A water supply passage for heat exchange of a roll, a circulation pump, a secondary side of a heat exchanger for heating and a secondary side of a heat exchanger for cooling are provided in the middle of the circulation water passage. a b Lumpur for heating and cooling device connected to the discharge side of the pump, the
Connects the inlet and outlet of the secondary side of the heating heat exchanger
A bypass water passage to flow, and a flow on the secondary side of the cooling heat exchanger.
A heating / cooling device for a roll, comprising: a bypass water passage connecting an inlet side and an outlet side . 2. A heat exchange passage for a roll is provided in the middle of the circulation channel.
Water channel, circulation pump, secondary side of heat exchanger for heating and for cooling
Provide the secondary side of the heat exchanger and install the pressurized water supply pump in the circulation
A heating and cooling device for a roll connected to a discharge side,
Connect a pressure control valve to the discharge side of the pressurized water supply pump, and
Before the circulating water flowing through the canal becomes 100 ° C or more
During operation of the circulation pump, the pressurized water supply pump
Heating for rolls, characterized in that the heater is operated
Cooling system. 3. A pressure regulating valve is connected to a discharge side of the pressurized water supply pump, and the circulating pump is operated under a condition that circulating water flowing through the circulating water channel is 100 ° C. or more, and claim 1 which is adapted to operate the supply pressure water pump
The heating and cooling device for a roll according to the above. 4. The suction of the pressurized water supply pump into a water supply tank.
Side, and connect a safety valve to the circulation
To each drain side of the safety valve and the pressure control valve.
The heating / cooling device for a roll according to claim 2 or 3.