JP5283230B2 - Water supply device for washing tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water supply device for a washing tank, which measures the electrical conductivity of washing water with high accuracy by preventing grime from depositing on a sensor for measuring the electrical conductivity and for controlling water supply, prevents a plating failure due to a supply shortage of washing water, and also prevents needless washing water from being supplied. <P>SOLUTION: The water supply device has a sensor 1 for detecting electrical conductivity provided at a position lower than a liquid level in the inside of a sensor holder 2 that works as a supply opening of water to be supplied to the washing tank through a solenoid valve 11. The water supply device further has: a converter 5 which measures the electrical conductivity with the sensor 1; a comparator 6 which compares a measured value of the electrical conductivity with a set value that is set by a conductivity-setting instrument 7 and generates a signal when the measured value has exceeded the set value; a timing device 8 which generates an output for a fixed period of time set by a timing-setting instrument 9 when the comparator 6 has generated the signal; and a solenoid-valve-driving device 10 which drives the solenoid valve 11 when the timing device 8 has generated the signal. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a water supply device for a rinsing tank that supplies rinsing water to a rinsing tank of a plating apparatus.

  In the plating apparatus, the workpiece is washed with water while moving from each process to the next process. Since this washing is related to the plating quality, it is necessary to keep the quality of the washing water at a certain level or higher, and clean water is supplied to the washing tank to suppress an increase in impurity concentration. In many cases, the flush water is supplied to and stopped from the flush tank by an operator who opens and closes the valve. During the operation of the apparatus, the flush water is continuously supplied regardless of the amount of work. From the viewpoint of saving water, it is desirable to reduce the amount of water supply when the amount of work is small, or to stop water supply when there is no work in the washing tank at the beginning or end of work. In the present situation, washing water is wastefully supplied.

  It is not economically and environmentally preferable that the washing water is supplied wastefully. For example, as shown in Non-Patent Document 1, an electric conductivity meter is installed in the washing tank to provide a solenoid valve for water supply. There has been proposed a method for controlling the amount of water to reduce the amount of washing water. This non-patent document 1 shows that a final water washing tank of a multistage counter-flow water washing is provided with an electric conductivity meter, and it is described that water bills and waste water treatment costs can be saved.

"Management and practice of electroplating wastewater treatment" Textbook of the workshop organized by the Ministry of International Trade and Industry in 1988.

  As described above, conventionally, there has been a problem that flush water is supplied wastefully. The method as shown in Non-Patent Document 1 is one means for solving this problem. An electric conductivity meter is provided in the washing tank to measure the electric conductivity of the washing water, and the electric conductivity is determined from the set value. When it becomes larger, water is supplied, and when it becomes smaller than the set value, water supply is stopped. However, the sensor of the electric conductivity meter is always immersed in the washing water, so that dirt adheres to the surface and the measurement accuracy of the electric conductivity decreases, and even if the washing water quality deteriorates, it cannot be detected and not supplied. There is a problem that plating failure occurs due to poor cleaning. Moreover, when the hysteresis of the electric conductivity meter is large, there is a problem in that the electric conductivity meter does not return even if the electric conductivity decreases, and water is supplied excessively.

  The present invention is intended to solve the above-mentioned problems. It prevents the contamination of the sensor for measuring electrical conductivity, accurately measures the electrical conductivity of washing water, and prevents plating defects due to insufficient supply of washing water. At the same time, it is an object of the present invention to realize a water supply device for a washing tank in which flush water is not supplied unnecessarily.

In order to solve the above-mentioned problems, the water supply device for the washing tub of the present invention includes a sensor for detecting the electrical conductivity of the rinsing water provided at a position below the liquid level inside the water supply port of the rinsing tub, and an output of the sensor. Measuring means for measuring electrical conductivity from the signal, comparing means for comparing the measured value of electrical conductivity with the set value and generating a signal when the measured value exceeds the set value, and comparing means for generating the signal In this case, there are provided time-limit means for generating an output for a certain period of time, and electromagnetic valve driving means for driving so as to open the electromagnetic valve of the water supply port when the time-limit means generates a signal.
Moreover, it is preferable to provide a water passage hole on the outer periphery of the water supply port in the vicinity of the sensor.

In the present invention, since the sensor is provided inside the water supply port, when the water is supplied, the sensor is washed with the supplied clean water, so that no dirt is attached.
In addition, when a water passage hole is provided in the outer periphery of the vicinity of the sensor of the water supply port, mixing of clean water supplied in the vicinity of the sensor after the stop of water supply and the water washing tank present in the water washing tank is performed quickly, Changes in the electrical conductivity of flush water in the flush tank can be measured without significant delay.

  As described above, the present invention has an advantage that the sensor is washed with clean water each time water is supplied, so that dirt does not adhere and the measurement accuracy of electrical conductivity does not deteriorate. As a result, when the quality of the rinsing water deteriorates, it is possible to reliably supply water and to prevent the occurrence of defective plating due to poor cleaning. Even if the sensor has a large hysteresis, one time of water supply is terminated by the time limit means, so that it is not excessively supplied.

It is a block diagram which shows embodiment of this invention. It is sectional drawing which shows the state with which it attached to the water-washing tank.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  In the figure, reference numeral 1 denotes a sensor for detecting the electrical conductivity of washing water, which is housed in a cylindrical sensor holder 2 made of an insulating material. The sensor holder 2 is attached to the tip of a water supply pipe 3 for supplying water to the washing tub and serves as a water supply port. A plurality of water holes 4 and 4 are provided on the side surface of the sensor holder 2. The water tank is overflowed and the liquid level is kept constant in the same way as the conventional water tank, and the sensor holder 2 is installed so that the sensor 1 and the water holes 4, 4 are below the liquid level L of the water tank. Has been. A driving signal is given to the sensor 1 from a converter 5 which is a measuring means, and a measuring signal of electrical conductivity is output from the converter 5.

  The output of the converter 5 is given to a comparator 6 which is a comparison means. The comparator 6 outputs an output when the measurement signal input from the converter 5 exceeds the electric conductivity set by the conductivity setting unit 7. Is configured to occur. The output of the comparator 6 is given to a timing device 8 which is a timing means, and the timing device 8 is configured to generate an output for a time set by the time setting device 9 when a signal is given from the comparator 6. ing. The output of the timing device 8 is given to a solenoid valve driving device 10 which is a solenoid valve driving means, and the solenoid valve driving device 10 is provided in the middle of the water supply pipe 3 only while the output is given from the timing device 8. The electromagnetic valve 11 is driven to open the electromagnetic valve 11.

  In the water supply device for the washing tub according to the present invention configured as described above, the sensor holder 2 is installed in the rinsing tub so that the sensor 1 and the water passage holes 4 and 4 are below the liquid level L of the rinsing water. . In the case of multi-stage counter-current washing, it is installed in the final washing tank. The sensor holder 2 is connected to a water supply pipe through a water supply pipe 3 provided with a solenoid valve 11 and a faucet 12 on the way. The faucet 12 is provided as necessary. These sensor holder 2, water supply pipe 3, solenoid valve 11 and the like can be integrally formed as shown in FIG. 2, and can be easily installed on the flange portion of the washing tank by being integrally formed. it can.

  A target value of the electrical conductivity of the rinsing water in the rinsing tank to be maintained below this value is set by the conductivity setting device 7, and a water supply time per time is set by the time setting device 9. The time set by the time limit setting device 9 is appropriately determined from the capacity of the washing tank and the amount of water supplied per fixed time, and is set to, for example, 30 seconds. When the treatment liquid adhering to the workpiece is brought into the washing tank from the previous process, the electrical conductivity of the washing water in the washing tank rises and is detected by the sensor 1, and the electrical conductivity is measured from the converter 5 to the comparator 6. A signal is given. When this measurement signal exceeds the set value set by the conductivity setting device 7, a signal is given from the comparator 6 to the timing device 8.

  When a signal is given to the timing device 8, a signal is given from the timing device 8 to the electromagnetic valve driving device 10 for the time set by the time setting device 9. When a signal is given to the electromagnetic valve driving device 10, the electromagnetic valve 11 is driven and opened by the electromagnetic valve driving device 10 only during that time. When the electromagnetic valve 11 is opened, water is supplied to the washing tank through the water supply pipe 3 and the sensor holder 2, and the sensor 1 accommodated in the sensor holder 2 is washed with clean flush water flowing in the sensor holder 2. At this time, the sensor 1 detects the electric conductivity of the clean flush water, and the electric conductivity measured by the converter 5 is lower than the set value of the conductivity setting device 7, so that the timing device 8 No signal is given from the comparator 6, but the timing device 8 continues to output the signal for the time set by the time setting device 9.

  When the time set by the time setting device 9 elapses, no signal is given to the electromagnetic valve driving device 10 from the time setting device 8, the electromagnetic valve 11 is not driven and is closed, and water supply is stopped. When the water supply is stopped, the washing water near the sensor 1 is mixed with the surrounding washing water through the water holes 4, 4 and the opening at the tip, and the measured electrical conductivity is increased. When the electrical conductivity rises and exceeds the set value set by the conductivity setting device 7, the electromagnetic valve 11 is opened again for the time set by the time limit setting device 9 as described above, and the washing water enters the washing tank. Supplied. This is repeated thereafter until the electric conductivity after the water supply is stopped does not exceed the set value set by the conductivity setting unit 7. Thereby, the electrical conductivity of the rinsing water in the rinsing tank is maintained below the set value until the workpiece enters the rinsing tank next time.

  Moreover, after detecting that it exceeded the set value in the washing tank and starting water supply, time measurement can also be started from the time when the value detected by the sensor 1 becomes small. That is, when the output is once output from the comparator 6, and thereafter the output is lost, the timing device 8 is given a signal, and this is repeated. In the case of this method, water can be continuously supplied without closing the solenoid valve 11 when the value does not decrease even after supplying water for a certain period of time.

  As described above, in the water supply device for a water cistern according to the present invention, the sensor 1 is washed with clean water every time water is supplied, so that no dirt is attached. As a result, the measurement accuracy of electrical conductivity does not decrease, so when the quality of the washing water deteriorates, it can be reliably detected and supplied, preventing the occurrence of plating defects due to poor washing. it can. Even if the hysteresis of the sensor 1 is large, one time of water supply is terminated by the time-limit device 8, so that it is not excessively supplied.

DESCRIPTION OF SYMBOLS 1 Sensor 2 Sensor holder 3 Water supply pipe 4 Water flow hole 5 Converter 6 Comparator 7 Conductivity setter 8 Time limit device 9 Time limit setter 10 Solenoid valve drive device 11 Solenoid valve 12 Water faucet

Claims (2)

  A sensor that is provided below the liquid level inside the water supply port of the rinsing tank and detects the electrical conductivity of the rinsing water, a measuring means for measuring the electrical conductivity from the output signal of this sensor, and a measured value of the electrical conductivity, Comparing means for generating a signal when the measured value exceeds the set value by comparing with the set value, a timing means for generating an output for a certain time when the comparing means generates a signal, and the time means generating the signal And a solenoid valve driving means for driving the solenoid valve of the water supply port to open.   The water supply device for a washing tub according to claim 1, wherein a water passage hole is provided in an outer periphery of the water supply port in the vicinity of the sensor.

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