JPH04176307A - Alarm for clogging of filter - Google Patents

Abstract

PURPOSE:To accurately and easily discriminate the clogging of a filter and to actuate an alarm at the appropriate time by electrically detecting the clogging of the filter as the numerical data. CONSTITUTION:Pressure gages 12-14 are provided to measure the pressure at the filter sites 6, 8 and 9 of a filter system 5. The detected values of the gages are transduced into voltage and current by a electric transducers 15-17. In the controlling and determining part 18, an alarm 19 is actuated when the voltage or current of the transducers 15-17 exceeds the set value to communicate the clogging of the filter parts 6, 8 and 9. As a result, the clogging of the filter part is accurately and easily discriminated, the alarm part is actuated at the appropriate time, working efficiency is improved, and high productivity is attained.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a clogging alarm device for a filtration device.

Conventional technology In machine tools such as grinders, machining fluid is poured into the grinding area in order to remove chips such as grinding dust generated during grinding, and to cool the grinding wheel and workpiece being ground. . This processing fluid is collected and used again, so
Grinding powder is removed by a filtration device. As this filtration device, for example, a cartridge filter device is used. When the filter part of the cartridge filter device becomes clogged, the amount of machining fluid discharged from the discharge nozzle that pours out the machining fluid decreases, and the color of the machining fluid also changes.
Conventionally, an operator would judge whether the filter was clogged based on the amount of machining fluid discharged and the color of the machining fluid and replace the filter.

Problems to be Solved by the Invention However, the conventional method described above has a problem in that it requires experience, intuition, and skill in order to be able to quickly determine whether the filter is clogged.

To deal with this, a pressure gauge is installed in the filter installation part of the cartridge filter device, and an operator can visually check the pressure rise in the filter installation part when the filter part becomes clogged. However, in this case, the operator has to frequently check the pressure gauge, which creates an additional problem in that it takes time and effort. Furthermore, if the pressure rises by one level, that is, the filter section is clogged, a large amount of money and time may be spent on maintenance such as replacing the cartridge filter device.

The present invention solves the above-mentioned problem, and aims to provide a clogging alarm device for a filtration device that can detect clogging in advance and accurately in a filter applied to a filter such as a car IJ filter device. It is something.

Means for Solving the Problems In order to solve the above problems, the clogging alarm device for a filtration device of the present invention is provided with a pressure gauge that measures the pressure in the filter installation part of the filtration device, and detects the detected pressure of the pressure gauge. An electric converter that converts the voltage or current into voltage or current is provided, and a control judgment unit is installed that activates an alarm unit to notify that the filter unit is clogged when the voltage value or current value of this electric converter exceeds a set value. It is something.

Effect With the above configuration, the pressure in the filter installation part of the filtration device is electrically detected to detect the degree of clogging of the filter part, so the voltage, current, etc. values can be adjusted according to the degree of clogging of the filter part. By conducting a test in advance and setting the value immediately before clogging as the threshold value, when the filter section is about to become clogged, the voltage and current values of the electrical converter will exceed the set value. Therefore, the condition of this filter section is notified by the alarm section.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic diagram of a filtration device system for a grinding machine according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a grindstone of a grinding machine, 2 a workpiece to be ground by the grindstone 1, and a discharge nozzle 3 for pouring out a machining fluid X is disposed near the part where the workpiece is being ground. Further, a filtration device 5 is provided downstream of the recovery/extraction port 4 where the processing liquid X is recovered.
The machining fluid X discharged from the recovery outlet 4 is filtered by a filtration device 5 and then sent to the discharge nozzle 3 for reuse.

The filtration device 5 includes a hanging cloth as a filter section, a centrifugal separator 6 disposed downstream of the recovery outlet 4, and a pore size of 1 μm.
A first cartridge filter device 8 has a filter section with a pore size of 0.5 μm, and a first cartridge filter device 8 that sucks and filters the processing liquid X discharged from the centrifugal separator 6 from the pump 7; A second cartridge filter device 9 connected downstream of the filter device 8, a pump 10 that sends the machining fluid X discharged from the second cartridge filter device 9 to the discharge nozzle 3, a first reservoir 11a and a The tank 11 has two storage parts 11b.

Here, a differential pressure gauge 12 is connected to the centrifugal separator 6 to detect the pressure difference between the outside and inside of the hanging cloth, and each cartridge filter device 8, 9 is connected to a pressure gauge 12 for measuring the pressure at the filter installation part. A total of 13.14 are connected respectively. The differential pressure gauge 12 and the pressure gauge 13.14 are connected to voltage converters 15 and 16.1 that output the differential pressure and voltage according to the pressure.
It is connected to the control determination section 18 via 7.

The control determination unit 18 includes a setting unit 18a that can appropriately set three set values as threshold values, and a setting unit 18a that converts each set value of the setting unit 18a into a voltage value corresponding to the differential pressure and pressure from the voltage converters 15, 16, and 17. In comparison with the voltage converters 15, 16, and 17, the controller 18 has an arithmetic determination unit 18b that drives the alarm unit 19 when the input voltage value from the voltage converter 15, 16, or 17 exceeds a set value. Here, the degree of change in voltage according to the degree of clogging of the hanging cloth of the centrifugal separator 6 and the filter portion of each cartridge filter device 8, 9 has been investigated in advance through tests, and The voltage value when the hanging cloth or the filter portion of each cartridge filter device 8, 9 is a little clogged is inputted as the above-mentioned set value. Further, the alarm section 19 is provided in the operating section of the grinding machine, and consists of a display 19a and an alarm buzzer 19b.

With the above configuration, when the hanging cloth of the centrifugal separator 6 or the filter section of each cartridge filter device 8, 9 becomes clogged, the differential pressure or pressure at each section increases, and the voltage from the voltage converter 15, 16, 17 increases. Because the value exceeds the set value,
The display 19a and the alarm buzzer 1 are activated by the control determination unit 18.
9b is activated to display and report the clogging condition.

In the above embodiment, the differential pressure or pressure may be converted into a voltage value and compared with a set value, or the differential pressure or pressure may be converted into a current value, and in either case, the filter section It is possible to accurately and easily detect clogging by accurately capturing the clogging state as numerical data. Also, work 2
Of course, it is possible to deal with any processing conditions by appropriately changing the threshold value (set value) depending on the material and processing method.

Effects of the Invention As described above, according to the present invention, since the clogging state of the filter section is electrically detected as numerical data, the clogging of the filter section can be accurately and easily determined, and the alarm section can be activated. can be activated at the appropriate time. This improves work efficiency and makes it possible to achieve high productivity.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a filtration device system for a grinding machine according to an embodiment of the present invention. 1... Grindstone, 2... Φ Work, 311... Discharge nozzle, 5... Filtration device, 6... Centrifugal molecule fl! , 8...
・First cartridge filter device, 9...Second cartridge, filter device, 1211・Differential pressure gauge, 13, 14
・Reference・Pressure gauge, 15.16, 17・Φ・Voltage converter, 1
8... Control determination section, 19... Alarm section.

Claims (1)

[Claims] 1. A pressure gauge is installed to measure the pressure at the filter installation part of the filtration device, and an electric converter is installed to convert the detected pressure of this pressure gauge into voltage and current, and the voltage and current values of this electric converter are set. A clogging alarm device for a filtration device, characterized in that a control determination section is provided which activates an alarm section to notify clogging of a filter section when a value exceeds a value.