JP2838372B2 - Coolant concentration measuring device and coolant adjusting system using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coolant concentration measuring device and a coolant regulating system using the same.

[0002]

2. Description of the Related Art A large amount of coolant liquid is transported and supplied through a coolant pipe for cooling, lubrication, cleaning of deposits, and the like in the rolling of a metal plate such as hot rolling of an aluminum plate. However, the measurement of the concentration of the coolant liquid is manually performed offline. That is, a coolant solution is collected from a coolant tank or the like, brought back to a test room, and the concentration of the coolant solution (the ratio of neat oil to pure water) is measured using a sulfuric acid decomposition method, a heat dehydration weight method, or the like. I have. Then, in order to keep the concentration of the coolant liquid within the predetermined range, the ratio of pure water to neat oil is calculated to calculate the ratio of the coolant liquid in the coolant tank, and based on this, Thus, pure water (water from which impurities such as metal ions have been removed by ion exchange) and neat oil are supplied to the coolant tank.

[0003]

Accordingly, there has been a problem that the measurement of the coolant concentration requires a lot of manpower and time, and is also expensive.

[0004] Therefore, the concentration measurement cannot be performed frequently, and the concentration measurement is usually performed once a day and pure water and neat oil are replenished based on the concentration measurement. There is a problem that there is a large density difference, and the surface quality of the product is significantly different before and after replenishment, resulting in uneven product quality.

[0005] Incidentally, it is difficult to mechanically measure the concentration by in-line, for example, the coolant liquid contains many bubbles and scum (solidified metal soap as a neat oil component) is generated. There are many difficult problems to do.

Accordingly, an object of the present invention is to provide a coolant concentration measuring device which has solved these problems. Another object of the present invention is to provide a coolant liquid adjusting system using the coolant concentration measuring device.

[0007]

In order to achieve the above object, a coolant concentration measuring apparatus according to the present invention comprises an independent pipe through which a coolant flows, a defoaming pump provided in the independent pipe, and a defoaming pump. Subsequently, the apparatus includes a concentration measuring chamber provided so that the flow path faces upward, a concentration measuring means provided in the concentration measuring chamber, and a cleaning device for cleaning the concentration measuring chamber.

In order to achieve the above object, a coolant liquid adjusting system according to the present invention is provided with a coolant concentration measuring device according to the first aspect and a coolant pump disposed on a coolant pipe in front of a coolant pump for applying a discharge pressure to a mill. An oil replenishment control circuit for instructing the oil replenishment means so that the coolant concentration becomes a predetermined value based on the measured value of the oil replenishment means, the coolant concentration measurement device, and a coolant fluid in the coolant tank. Coolant level measuring device for measuring the height of the surface, pure water replenishment means for the coolant tank, and pure water so that the coolant level becomes a predetermined height based on the measured value of the coolant level measuring device. A pure water supply control circuit for instructing the supply means.

[0009]

The coolant flowing through the independent pipe is defoamed by the defoaming pump, enters the concentration measuring chamber, and fills the concentration measuring chamber. The concentration measuring means measures the concentration of the liquid coolant sufficiently immersed in the liquid coolant and without any bubbles. Occasionally, the cleaning device removes dirt such as scum attached to the concentration sensor.

In the coolant liquid adjusting system, the oil supply control circuit supplies oil from the oil supply means to the coolant pipe on the front side of the coolant pump based on the data of the coolant concentration measuring device. On the other hand, pure water is supplied from the pure water supply means to the coolant tank by the pure water supply control circuit based on the data of the coolant level measuring device. Both of these control the amount and concentration of the coolant liquid.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In FIG. 2, a coolant pipe 3a from the clean tank 1a of the coolant tank 1 to the mill 2 is shown.
The coolant liquid is rolled by the mill 2 and the mill 2 by the nozzle 4 (not shown).
Sprayed on. Nozzle 4 of this coolant pipe 3a
A pump (hereinafter, referred to as a coolant pump) 6 for applying a large force is provided on the front side of the unit so that the coolant can be discharged from the nozzle 4 at a constant pressure. A liquid receiving portion 7 is disposed below the mill 2 and the liquid receiving portion 7
A coolant pipe 3b extending from the coolant tank 1 to the dirty tank 1b of the coolant tank 1 is provided. A coolant pipe 3c from the dirty tank 1b of the coolant tank 1 to the clean tank 1a is provided, and a filter pump 8 and a filter 9 are provided on the way. The clean tank 1a and the dirty tank 1b are adjacent to each other by a partition wall 1c, and the coolant liquid overflowing the clean tank 1a returns to the dirty tank 1b.

Next, as shown in FIG. 2, the concentration measuring device 11 of the present invention comprises a clean tank 1a and a coolant pump 6.
In the coolant pipe 3a between the two, the independent pipe 12 is branched and formed on an extension of the independent pipe 12. Then, as shown in FIG.
Then, a defoaming pump 13 composed of a rotary pump without fear of corrosion swelling is disposed, and subsequently, a hollow concentration measuring chamber 14 having a substantially circular or rectangular cross section is disposed so that the flow path faces upward. The horizontal sectional area of the hollow portion of the concentration measuring chamber 14 is larger than the internal sectional area of the independent pipe 12. Then, a downstream independent pipe 12 is provided above the concentration measuring chamber 14, and this is again supplied to the dirty tank 1 of the coolant tank 1.
back to b. In the concentration measuring chamber 14, a concentration measuring means 16 composed of an ultrasonic concentration sensor is inserted.
The ultrasonic concentration sensor 16 is provided with an ultrasonic transmission and reception unit (not shown), and the transmission and reception units sufficiently intersect with the coolant flow flowing from the bottom to the top in the concentration measurement chamber 14. Thus, the position of the ultrasonic density sensor 16 is determined. The ultrasonic concentration sensor 16 is provided with a temperature measuring device so that the temperature of the coolant liquid can be measured (not shown).

Next, the cleaning device 15 will be described. In the concentration measuring chamber 14, the pure water flows from the upper side to the lower side,
A cleaning pipe 17 is connected to the upper part of the concentration measuring chamber 14 and to exit from the lower part. Pure water flows through the cleaning pipe 17 at a high speed, and the pure water that has entered the concentration measuring chamber 14 cleans the concentration sensor 16, particularly its transmitting and receiving sections, and the inner wall of the concentration measuring chamber 14 with a strong force. The cleaning waste liquid is discharged from the lower cleaning pipe 17. The lower cleaning pipe 17 is connected to a drain pit (not shown). The independent pipe 12 is provided with solenoid valves 18 and 19 on the front side of the defoaming pump 13 and on the rear side of the concentration measuring chamber 14. The cleaning pipe 17 is provided with solenoid valves 21 and 22 before and after the concentration measuring chamber 14. The solenoid valves 18, 19, 21 and 22 have a manual valve 1.
18, 119, 121 and 122 are provided side by side, and these manual valves are usually closed. Next, the cleaning control circuit 2
A cycle timer 24 is connected to a pump switch 26, a coolant electromagnetic valve opening / closing circuit 27, a cleaning timer 28, and a pure water electromagnetic valve opening / closing circuit 29. Drive motor 1 of defoaming pump 13
3a is connected to the pump switch 26. The solenoid valves 18 and 19 of the independent pipe 12 are connected to a coolant solenoid valve opening / closing circuit 27, and the solenoid valves 21 and 22 of the cleaning pipe 17 are connected to a pure water solenoid valve opening / closing circuit 29.

As described above, since the concentration measuring device 11 is formed on the independent pipe 12, the defoaming pump 13 and the cleaning device 1
5 can be provided. In addition, at first, we tried to arrange the concentration sensor 16 directly in the coolant tank 1 to measure the concentration, but it was not possible to measure the concentration accurately due to the presence of a large amount of bubbles and the like. An independent pipe 12 is formed, on which a concentration measuring device 11 is provided.

Next, the coolant liquid adjusting system 3 of the present invention.
0 will be described. As shown in FIGS. 1 and 2, an oil replenishing means 31 is provided so as to be connected to a coolant pipe 3 a on the front side of the coolant pump 6. That is, the neat oil tank 32 and the coolant pipe 3a are connected by the oil supply pipe 33, and the solenoid valve 34 and the oil supply pump 36 are provided on the oil supply pipe 33.

The oil supply control circuit 37 includes a CPU 38
Is incorporated, and the concentration calculation circuit 3 in the circuit 37 is provided.
9, connected to the density setting device 41 and the supply command circuit 42. The CPU 38 supplies the oil while the cycle timer 24 of the cleaning control circuit 23 is operating,
During the first set time until the oil is sufficiently mixed with the coolant and the oil concentration is averaged, and after the completion of the cycle of the washing cycle timer 24, the coolant is again allowed to flow into the concentration measuring chamber 14, During the second set time, control is performed so as not to replenish the oil until a predetermined time during which the low concentration state due to mixing with the remaining pure water can be eliminated (not shown). The target density and the replenishment start density are set in the density setting device 41. The replenishment command circuit 42 is connected to the replenishment amount setting device 43, the solenoid valve 34, and the motor 36a of the oil replenishment pump. The replenishing amount setting unit 43 sets the amount of oil replenishment per operation. The density calculation circuit 39 is connected to the density sensor 16 via the relay 44 and to the recorder 46.
Recorder 46 is located on the ground for easy monitoring.

As shown in FIG. 2, the coolant level measuring device 47 is provided at the position of the dirty tank 1b and has a lower limit value measuring means 48a and an upper limit value measuring means 48b. When the liquid level falls below the position of the value measuring means 48a, it is detected by the means 48a that the liquid level has fallen below the lower limit. When the liquid level rises above the position of the upper limit value measuring means 48b, the liquid level is raised by the same means 48b. More than that is detected.

The pure water replenishing means 49 includes a dirty tank 1b.
The pure water supply pipe 51 is formed by providing a pure water supply pipe 51, and an electromagnetic valve 52 is provided in the pure water supply pipe 51.

The pure water replenishment control circuit 53 is connected to the coolant level measuring device 47 and the solenoid valve 52. When a signal indicating that the liquid level has fallen below the lower limit is sent from the coolant level measuring device 47, The signal to open the solenoid valve is sent to solenoid valve 5
When a signal indicating that the liquid level has exceeded the upper limit is sent, a signal to close the solenoid valve is sent to the solenoid valve 52.

Next, the operation of the devices 11 and 30 of the above embodiment will be described.

The coolant in the clean tank 1a is increased in pressure by a coolant pump 6 through a coolant pipe 3a and is sprayed from a nozzle 4 onto a mill 2 and a rolled plate to cool, lubricate, and clean off deposits in the rolling process. And so on. At this time, a part of the coolant liquid adheres to the rolled plate, and a part of the coolant liquid, particularly pure water, evaporates. The remaining coolant liquid falls into the liquid receiving section 7 and is collected in the dirty tank 1b of the coolant tank 1 through the coolant pipe 3b. The coolant in the dirty tank 1b is driven by the filter pump 8, is filtered by the filter 9, and moves to the clean tank 1a.

Next, a part of the coolant liquid flowing through the coolant pipe 3 a passes through the independent pipe 12 and passes through the defoaming pump 13.
After the bubbles have disappeared, the gas flows from the lower side to the upper side in the concentration measuring chamber 14, exits the concentration measuring chamber 14, passes through the downstream independent pipe 12, and is returned to the coolant tank 1 again. Then, in the concentration measuring chamber 14, the concentration sensor 16
Thus, ultrasonic waves are emitted to the coolant flowing through the apparatus to measure the ultrasonic wave propagation velocity, the temperature of the coolant flowing through the apparatus is measured, and these data are sent to the concentration calculation circuit 39. Since bubbles are eliminated by the defoaming pump 13 and the coolant flows from the lower side to the upper side in the concentration measuring chamber 14, the horizontal sectional area of the concentration measuring chamber 14 is larger than the internal sectional area of the independent pipe 12. Therefore, bubbles hardly occur in the concentration measuring chamber 14, and the concentration measuring chamber 14 is always filled with the coolant liquid and the concentration sensor 16
These allow for accurate ultrasonic velocity and temperature measurements, since no contact is caused.

The concentration calculation circuit 39 calculates the concentration of the coolant based on the speed and temperature data sent thereto, and sends the result to the CPU 38. The CPU 38 sends a signal to the replenishment command circuit 42 when the concentration becomes equal to the replenishment start concentration set by the concentration setter 41, and the replenishment command circuit 42 supplies the replenishment set by the replenishment amount setter 43. A signal is sent to the solenoid valve 34 and the motor 36a of the oil supply pump so as to supply the neat oil by the amount. When this signal is sent, the solenoid valve 34 is opened and the pump 36 is driven, so that neat oil is supplied from the neat oil tank 32 to the coolant pipe 3 a on the front side of the coolant pump 6. The replenished neat oil is sent to the coolant pump 6 together with the coolant in the pipe 3a and sufficiently stirred, so that the neat oil can be sufficiently dissolved in the coolant. Thereafter, these are blown out from the nozzle 4. Then, the liquid is circulated to the liquid receiving section 7, the coolant pipe 3b, the dirty tank 1b, the coolant pipe 3c, the clean tank 1a, and the coolant pipe 3a, and the coolant liquid concentration is averaged by repeating this plural times. During this time, the CPU 38 is controlled so as not to resupply the oil until the first set time has elapsed, even if the concentration not reaching the target concentration has been measured. If the density has not reached the target density after the lapse of the first set time, oil replenishment is performed again in the same manner as described above. Oil is supplied in this manner, and when the concentration reaches the target concentration, the oil supply is stopped. Then, the oil supply is started again when the supply start concentration is measured next time.

The density measurement by the density sensor 16 is always performed, and the density calculated by the density calculation circuit 39 is always recorded on the recording paper 46a of the recorder 46.

Next, the concentration measuring chamber 14 is periodically cleaned by a cleaning device. That is, the cycle timer 24 of the cleaning control circuit 23 is activated at predetermined time intervals, and the pump switch 26 is first turned on by the motor 1 of the defoaming pump.
The switch 3a is turned off, and then the coolant-based solenoid valve circuit 27 is driven to close the solenoid valves 18 and 19 of the independent pipe 12. Then, the pure water electromagnetic valve opening / closing circuit 29 is driven to open the electromagnetic valves 21 and 22 of the cleaning pipe 17, and the cleaning timer 28 is driven so that the pure water flows into the cleaning pipe 17 at high speed. As a result, the pure water flows in the concentration measuring chamber 14 with a strong force, and the concentration sensor 16, particularly, its transmitting and receiving units, and the inner wall surface are washed away, and dirt such as scum adhered thereto is washed. . Since the pure water flows from the upper side to the lower side in the concentration measuring chamber 14, a large energy is given to the pure water due to the energy of the fall, and more efficient cleaning is performed. Further, since the substrate is washed with pure water, adverse effects such as oil deterioration that occur when hard water containing metal ions is used do not occur. The washing wastewater passes through the downstream washing pipe 17 and is collected in a drain pit, and the wastewater is subjected to a predetermined treatment and discarded. When the cleaning timer 28 stops, the supply of pure water stops, and the pure water electromagnetic valve opening / closing circuit 29 is driven to close the electromagnetic valves 21 and 22 again. Next, the coolant-based solenoid valve opening / closing circuit 27 is driven to open the solenoid valves 18 and 19, and then the pump switch 26 is turned on to drive the defoaming pump 13 and a series of operations of the cycle timer 24 is completed. . As a result, the coolant flows into the concentration measurement chamber 14 again, and the concentration measurement by the concentration sensor 16 in a state where scum or the like does not adhere becomes possible. The concentration measurement by the concentration sensor 16 is always performed during the washing,
During the operation of the cleaning cycle timer 24, the CPU 38 controls the oil supply so as not to be performed. Further, when the coolant liquid starts to flow again after the completion of the cycle timer, the CPU 38 is controlled so as not to supply the neat oil during the second set time. Thus, replenishment of oil due to malfunction due to low oil concentration is prevented. Next, in the cleaning process, the solenoid valve 18,
When 19, 21 or 22 breaks down, the manual valves 118, 119, 121 and 122 attached are opened and closed manually. When only the solenoid valve is used, when the solenoid valve is broken, coolant and pure water cannot flow until the replacement of the solenoid valve, which takes a long time, is completed. Thus, the coolant valve and the pure water can be made to flow by opening and closing the manual valve in this manner.

Next, the liquid level of the dirty tank 1b is constantly monitored by the coolant level measuring device 47. When the lower limit value measuring means 48a detects that the liquid level is lower than the lower limit value, this data is transmitted to the pure water supply control circuit 53, and the pure water supply control circuit 53
Sends a signal to open the solenoid valve to the solenoid valve 52 of the pure water replenishment means 49, whereby the pure water passes through the pure water replenishment pipe 51,
It is supplied to the dirty tank 1b. When the liquid level rises and the upper limit value measuring means 48b detects that the liquid level has exceeded the upper limit value, the pure water supply control circuit 53 similarly sends a signal to the solenoid valve 52 to close the solenoid valve. The supply of pure water is thereby stopped, and by repeating this, the total amount of the coolant liquid is kept constant.

The coolant adjusting system 30 of the present invention
Since the oil supply and the pure water supply are separately performed, the configuration of the oil and pure water supply device can be further simplified. Also, replenish pure water with coolant tank 1.
It takes a long time to reach the mill 2, and when replenished, it can be mixed with other large amounts of coolant to eliminate the presence of a thin concentration portion more quickly. Prevent supply. In addition, since the supply of oil is performed on the front side of the coolant pump 6, a large stirring force is applied, and a more appropriate emulsion can be formed.

[0029]

The coolant concentration measuring device of the present invention is constructed as described above, so that it is possible to eliminate bubbles.
In addition, washing can be performed, and the concentration of the coolant liquid can be measured in-line. As a result, the labor, time, and cost of the concentration measurement can be reduced. Therefore, the frequency of density measurement can be increased, and the frequency of replenishment can be increased, thereby reducing the difference in density between before and after replenishment, and stabilizing product quality.

Further, since the coolant liquid adjusting system of the present invention is configured as described above, the device configuration is simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a coolant concentration measuring device according to an embodiment of the present invention and a coolant liquid adjusting system (part) using the same according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a coolant liquid adjustment system according to one embodiment of the present invention.

[Explanation of symbols]

1 coolant tank 2 mil 3a
Coolant piping 6 Coolant pump 11 Coolant liquid concentration measuring device 12 Independent piping 13 Defoaming pump 14
Concentration measuring chamber 15 Cleaning device 16 Concentration measuring means (concentration sensor) 30 Coolant liquid adjustment system 31 Oil replenishment means 37 Oil replenishment control circuit 47 Coolant liquid level measuring device 49 Pure water replenishment means 53 Pure water replenishment control circuit

Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI G01N 29/02 G01N 29/02 33/30 33/30 (72) Inventor Shigeo Fukuda 4-3-1, Nihonbashi Muromachi, Chuo-ku, Tokyo Sky Aluminum (56) References JP-A-63-264212 (JP, A) JP-A-1-258811 (JP, A) JP-A-4-4916 (JP, A) JP-A-5-237537 (JP, A) A) JP-A-3-268812 (JP, A) JP-A-3-234312 (JP, A) JP-A-2-151309 (JP, A) JP-A-60-206518 (JP, A) −109305 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21B 45/02 320 B21B 27/10

Claims (2)

(57) [Claims] 1. An independent pipe through which a coolant liquid flows, a defoaming pump provided in the independent pipe, and a concentration measuring chamber provided so that a flow path faces upward following the defoaming pump; A coolant concentration measuring device comprising: a concentration measuring means provided in the concentration measuring chamber; and a cleaning device for cleaning the concentration measuring chamber. 2. The coolant concentration measuring device according to claim 1, wherein the coolant concentration measuring device comprises: an oil replenishing means disposed on a coolant pipe in front of a coolant pump for applying a discharge pressure to a mill; An oil replenishment control circuit for instructing the oil replenishing means so that the coolant concentration becomes a predetermined value based on the measured value; and a coolant level measuring device for measuring a coolant level in the coolant tank. Means for replenishing the coolant tank with pure water, and a pure water replenishment control circuit for instructing the pure water replenishment means based on the measured value of the coolant level measuring device so that the coolant level becomes a predetermined height. A coolant liquid adjustment system, comprising: