Cleaning facility

Abstract

To replace water in a tank by determining contamination of washing water without using an expensive sensor.SOLUTION: The washing apparatus includes a washing machine 15, a first tank 100 for storing washing wastewater W1 discharged from the washing machine 15, and a second tank 200 for storing filtered washing wastewater W2 pressure-fed from the first tank 100 via a filter 102 and a 22f. A washing facility 10 that supplies filtered washing wastewater W2 pumped from a second tank 200 via a filter 202 to a washing machine 15 as washing water includes a counter that counts the number of times a component is set by a component detection means, and a water replacement device that determines washing water contamination when an integrated value of the counter exceeds a specified number of times, discharges washing wastewater W1 in a first tank 100 and filtered washing wastewater W2 in the second tank 200, and supplies raw water to the second tank 200.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present technology relates to a cleaning facility that includes a cleaning machine that uses cleaning water to clean processed parts, a first tank that stores cleaning wastewater discharged from the cleaning machine, and a second tank that stores filtered cleaning wastewater that is pressure-fed from the first tank through a filter, and that supplies the filtered cleaning wastewater that is pressure-fed from the second tank through the filter to the cleaning machine as the cleaning water. [Background technology]

[0002] In the above-mentioned cleaning equipment, if the contamination level of the post-filter cleaning wastewater (hereinafter referred to as cleaning water) exceeds the allowable level, the cleaning water in the first and second tanks must be replaced with clean water. Furthermore, the formation of foreign matter caused by oil, which is the main cause of cleaning water contamination, causes a loss of pressure in the piping and a decrease in the pump discharge flow rate over time. For this reason, it is possible to monitor the contamination level of the cleaning water by continuously measuring the pressure loss in the piping and the decrease in the pump discharge flow rate using a pressure sensor, flow sensor, etc.

[0003] Furthermore, as disclosed in Patent Document 1, it is also possible to directly measure the degree of contamination of wash water in a washing facility using a turbidity sensor that continuously measures the turbidity of water. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-65120 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the method of continuously measuring the pressure in the pipes using a pressure sensor, flow rate sensor, etc., the sensors are expensive, which increases the equipment cost. Also, in the method of directly measuring the dirtiness of the cleaning water using a turbidity sensor, the turbidity sensor is expensive, which increases the equipment cost.

[0006] This technology has been developed to solve the above problems, and the problem that the present invention aims to solve is to determine the contamination of cleaning water without using expensive sensors, and to enable the water in the tank to be replaced when the cleaning water becomes contaminated. [Means for solving the problem]

[0007] The above-mentioned problems are solved by various technologies. The first technology is a cleaning facility that includes a washing machine that washes processed parts with cleaning water, a first tank that stores the washing wastewater discharged from the washing machine, and a second tank that stores the filtered washing wastewater pressure-fed from the first tank through a filter, and supplies the filtered washing wastewater pressure-fed from the second tank through the filter to the washing machine as cleaning water, and also includes a part detection means that detects that a part has been set in the washing machine when the part is being washed, a counter that counts the number of times the part has been set in the washing machine by the part detection means, and a water replacement device that determines that the washing water is contaminated when the integrated value of the counter exceeds a specified number, and discharges the washing wastewater from the first tank and the filtered washing wastewater from the second tank, and supplies raw water to the second tank.

[0008] According to the first technology, when the counter's accumulated value exceeds a specified number of times, the wash water is determined to be dirty. When the wash water is determined to be dirty, the water exchanger discharges the wash wastewater from the first tank and the filtered wash wastewater from the second tank, and supplies raw water to the second tank. This makes it possible to determine whether the wash water is dirty without using expensive sensors, and also to exchange the water in the tank when the wash water is dirty.

[0009] According to the second technology, the water changing device is equipped with a control unit, and the control unit stores a specified number of times that serves as the standard for determining whether the wash water is dirty, and the specified number of times is set based on the integrated value of the counter when the oil concentration of the sampled post-filtration wash wastewater exceeds an allowable value. In this way, the specified number of times that serves as the standard for determining whether the wash water is dirty (the specified number of times that serves as the standard for changing the water in the tank) is when the oil concentration of the sampled post-filtration wash wastewater exceeds an allowable value, so the water in the tank can be changed at an appropriate time.

[0010] According to the third technology, the oil concentration of post-filtration washing wastewater is detected using a saccharometer. A saccharometer is an instrument that measures sugar content by detecting the concentration of solutes such as sugar contained in fruit juice, etc. In other words, a saccharometer is an instrument that measures the concentration of solutes in a liquid. If the oil in post-filtration washing wastewater is considered to be a solute in a liquid, the oil concentration of post-filtration washing wastewater can be detected using a saccharometer. In other words, the dirt in post-filtration washing wastewater (wash water) can be detected using a relatively inexpensive saccharometer.

[0011] According to the fourth technology, the water exchanger has a first valve that discharges the cleaning wastewater stored in the first tank, a second valve that discharges the filtered cleaning wastewater stored in the second tank, a water supply valve that supplies raw water to the second tank, and a level meter that can detect the liquid level in the second tank, and a control unit that operates the first valve, the second valve, and the water supply valve based on a signal from the level meter.As a result, the filtered cleaning wastewater in the second tank can be automatically replaced with raw water, reducing the amount of work required. [Effects of the Invention]

[0012] According to the technology of the present application, it is possible to determine whether the wash water is dirty without using an expensive sensor, and to replace the water in the tank when the wash water is dirty. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram of a cleaning facility according to a first embodiment of the present invention. [Figure 2]FIG. 2 is a diagram illustrating the measurement principle of a saccharimeter that detects the oil concentration of post-filter washing wastewater from the washing equipment. [Figure 3] 4 is a schematic diagram showing a part detection unit that detects that a part has been set in a washing machine of the washing equipment. FIG. [Figure 4] FIG. 2 is a wiring block diagram of the cleaning equipment. [Figure 5] FIG. 10 is a first flowchart showing the control for determining the degree of contamination of wash water in the washing facility. [Figure 6] FIG. 2 is a second flowchart showing the control for determining the degree of contamination of wash water in the washing facility. [Figure 7] FIG. 4 is a flowchart showing water replacement control of the washing equipment. DETAILED DESCRIPTION OF THE INVENTION

[0014] [Embodiment 1] 1 to 7, a description will be given of a cleaning equipment 10 according to a first embodiment of the present invention. The cleaning equipment 10 according to this embodiment is equipment for cleaning aluminum parts after cutting, and is equipped with a device for automatically replacing the cleaning water depending on the degree of contamination of the cleaning water.

[0015] <Overview of Cleaning Equipment 10> As shown in Fig. 1, the washing equipment 10 includes a washing machine 15, a first tank 100, and a second tank 200. The washing machine 15 is a device that uses washing water to wash aluminum parts 12 (see Fig. 3). The first tank 100 is a tank that stores washing wastewater W1 discharged from the washing machine 15. The second tank 200 is a tank that stores filtered washing wastewater W2 that is pressure-fed from the first tank 100 through filters 102 and 22f.

[0016] 1, the washer 15 is connected to the first tank 100 by a drainage pipe 21 that sends the cleaning wastewater W1. The first tank 100 is also connected to the second tank 200 by a drainage pressure pipe 22 and a return water line 25. The drainage pressure pipe 22 is a pipe that pressure-feeds the cleaning wastewater W1 from the first tank 100 that has been filtered by a suction filter 102 and a bag filter 22f to the second tank 200.

[0017] That is, as shown in Fig. 1, a drainage water pressure pump 22p is installed in the drainage water pressure pipe 22, and the upstream end of the drainage water pressure pipe 22 is connected to a suction filter 102 in the first tank 100. In addition, a bag filter 22f is installed in the drainage water pressure pipe 22 downstream of the drainage water pressure pump 22p. Here, as shown in Fig. 4, the drainage water pressure pump 22p is configured to operate based on a signal from the control unit 30 of the cleaning equipment 10. The return water passage 25 is a water passage that returns the filtered cleaning drainage W2 that has overflowed from the second tank 200 to the first tank 100.

[0018] The washing wastewater W1 discharged from the washer 15 contains a large amount of solid oil particles used in machining the aluminum parts, aluminum powder generated by cutting, etc. The suction filter 102 is a relatively coarse-mesh filter whose main purpose is to capture solid oil particles. In contrast, the bag filter 22f is a relatively fine-mesh filter whose main purpose is to capture fine aluminum powder, etc.

[0019] The cleaning wastewater W1 in the first tank 100 is filtered by a suction filter 102 and a bag filter 22f as shown in Fig. 1 by driving a drainage pressure pump 22p, and then pressure-fed to the second tank 200 through a drainage pressure pipe 22. Therefore, the filtered cleaning wastewater W2 in the second tank 200 has a significantly reduced amount of foreign matter such as oil solids and aluminum powder compared to the cleaning wastewater W1 in the first tank 100, and is kept in a relatively clean state.

[0020] As shown in Fig. 1, the second tank 200 is connected to the washer 15 by a cleaning water supply line 23. The cleaning water supply line 23 is a line that supplies filtered cleaning wastewater W2 (cleaning water) filtered by a suction filter 202 in the second tank 200 to the washer 15, and a cleaning water pressure-feed pump 23p is installed midway through the line. Here, the cleaning water pressure-feed pump 23p is configured to operate based on a signal from the control unit 30 of the cleaning equipment 10, as shown in Fig. 4. When the cleaning water pressure-feed pump 23p is driven, the filtered cleaning wastewater W2 in the second tank 200 is filtered by the suction filter 202 and then supplied to the washer 15 as cleaning water.

[0021] In this way, in the washing equipment 10, the washing wastewater W1 from the washing machine 15 is filtered by the suction filter 102 in the first tank 100, the bag filter 22f in the wastewater pressure pipe 22, and the suction filter 202 in the second tank 200, and is then supplied to the washing machine 15 again as washing water. For this reason, as the number of times aluminum parts are washed in the washing machine 15 increases, the washing water becomes contaminated, and the washing efficiency of the aluminum parts decreases. Furthermore, if the amount of foreign matter caused by solid oil increases due to the contamination of the washing water, this can cause the equipment to stop operation. For this reason, in the washing equipment 10 according to this embodiment, the contamination level of the washing water is periodically determined, and when the contamination of the washing water is determined, the filtered washing wastewater W2 in the second tank 200 is replaced with raw water (well water, tap water, etc.).

[0022] <How to determine the dirtiness of cleaning water> The contamination of the wash water is determined by sampling the post-filtration washing wastewater W2 that overflows the second tank 200. The oil concentration of the sampled post-filtration washing wastewater W2 is then measured, and if the oil concentration is higher than the allowable value, the wash water is determined to be contaminated. The oil concentration of the post-filtration washing wastewater W2 is measured using a saccharometer 40 that measures the sugar content of fruits, etc.

[0023] The saccharimeter 40 is an instrument that measures sugar content by detecting the concentration of solutes such as sugar contained in the juice of fruit or the like. As shown in FIG. 2, the saccharimeter 40 is equipped with a light source 41, a prism 43, and a light receiver 45, and measures sugar content by placing a sample on the surface of the prism 43. As the sugar concentration changes, the refractive index of light changes, and the critical angle θ changes. For example, as the sugar concentration increases, the refractive index of light increases. This causes the boundary between light and dark to change when viewed from the light receiver 45 side. Therefore, the sugar concentration can be detected by reading the change in the boundary between light and dark on the light receiver 45 using the scale.

[0024] Therefore, by placing the post-filtration washing wastewater W2 as a sample on the surface of prism 43 of saccharimeter 40, the oil concentration in the water can be detected as a change in the boundary between light and dark using saccharimeter 40. In other words, the dirt state of the post-filtration washing wastewater W2 can be determined using saccharimeter 40. Here, the dirt level of the post-filtration washing wastewater W2 increases as the number of times aluminum parts 12 are washed in washer 15 increases.

[0025] A switch member 18 (see Figures 3 and 4) capable of detecting that an aluminum part 12 has been set is provided in the internal space of the washer 15. Also, as shown in Figure 4, the control unit 30 of the washing equipment 10 is provided with a counter C that counts the number of times that an aluminum part 12 has been set in the washer 15. Therefore, the control unit 30 can store the integrated value of the counter C when the saccharimeter 40 determines whether the filtered washing wastewater W2 is dirty.

[0026] As shown in FIG. 3 , the switch member 18 is fixed to the underside of the shelf 17 of the washer 15 on which the aluminum part 12 is placed. The switch member 18 includes a switch main body 18s and a movable part 18m that operates the switch main body 18s. The movable part 18m moves downward against the spring force and is pushed into the switch main body 18s, turning the switch main body 18s ON. When the movable part 18m is returned to its upper limit position by the spring force, the switch main body 18s turns OFF. The movable part 18m of the switch member 18 passes through a through-hole 16h in the shelf 17 and protrudes above the shelf 17. Therefore, when the aluminum part 12 is placed on the shelf 17, the weight of the aluminum part 12 pushes the movable part 18m downward against the spring force, turning the switch main body 18s ON. The shelf 17 and the switch member 18 are covered with a waterproof member 16c.

[0027] <About the tank water changer> As shown in Fig. 1, a first valve 104 for discharging the cleaning wastewater W1 stored in the first tank 100 is attached to the bottom of the first tank 100. A second valve 204 for discharging the filtered cleaning wastewater W2 stored in the second tank 200 is attached to the bottom of the second tank 200. Furthermore, a water supply valve 205 for supplying raw water to the second tank 200 is attached to the top of the second tank 200. Furthermore, a level gauge 207 for detecting the water level in the tank is installed in the second tank 200.

[0028] The signal from the level meter 207 is input to the control unit 30 of the washing equipment 10, as shown in Fig. 4. The first valve 104, the second valve 204, and the water supply valve 205 are configured to operate based on the output signal from the control unit 30. When the control unit 30 determines that the washing water is dirty, it operates the first valve 104, the second valve 204, and the water supply valve 205 based on a program (described later) to replace the water in the second tank 200.

[0029] <Control of cleaning water contamination detection and tank water replacement> Next, the determination of the contamination of the wash water and the control of replacing the water in the tank will be described with reference to the flowcharts of Figures 5 to 7. First, control is performed based on the flowchart of Figure 5. That is, the filtered wash wastewater W2 sampled in the return water channel 25 (Figure 5, step S101) is set on the surface of the prism 43 of the saccharimeter 40, and the oil concentration of the filtered wash wastewater W2, i.e., the contamination of the wash water, is detected (Figure 5, step S102). Then, if the oil concentration of the filtered wash wastewater W2 is below the allowable value (Figure 5, step S103 YES), that is, if the contamination of the filtered wash wastewater W2 is within the allowable range, the washing equipment 10 is operated as is, and the aluminum parts 12 are washed by the washer 15 (Figure 5, step S104).

[0030] Furthermore, if the oil concentration of the post-filtration cleaning wastewater W2 exceeds the allowable value (FIG. 5, step S103 NO), that is, if the contamination of the post-filtration cleaning wastewater W2 exceeds the allowable range, the tank water replacement process is executed (FIG. 5, step S110). Here, if the contamination of the post-filtration cleaning wastewater W2 exceeds the allowable range, the integrated value of counter C at this time is stored as a specified number of times (see FIG. 6, step 206).

[0031] The tank water replacement process is performed based on the flowchart in Fig. 7. First, the first valve 104 of the first tank 100 and the second valve 204 of the second tank 200 are opened, and the cleaning wastewater W1 in the first tank 100 and the filtered cleaning wastewater W2 in the second tank 200 are discharged (Fig. 7, step S111). Then, the level gauge 207 determines whether the level of the filtered cleaning wastewater W2 in the second tank 200 is at or below the lower limit (Fig. 6, step S112). When the level of the filtered cleaning wastewater W2 in the second tank 200 falls below the lower limit and drainage is completed (Fig. 7, step S112: YES), the first valve 104 of the first tank 100 and the second valve 204 of the second tank 200 are closed (Fig. 7, step S113).

[0032] Next, the water supply valve 205 of the second tank 200 is opened (FIG. 7, step S114). This allows raw water (tap water, etc.) to be supplied into the second tank 200. Then, when the level of the raw water in the second tank 200 reaches the upper limit value (FIG. 6, step S115 YES), the water supply valve 205 is closed. In this state, the second tank 200 is filled with raw water. Next, as shown in step 104 of FIG. 5, the cleaning equipment 10 is driven, and the aluminum parts are cleaned by the cleaning machine 15.

[0033] When aluminum parts are washed in the washer 15, the washing wastewater W1 from the washer 15 is led to the first tank 100 by the drainage pipe 21. Here, raw water from the second tank 200 is supplied to the washer 15, and when the level of the raw water in the second tank 200 falls below the upper limit value (FIG. 7, step S115 NO), the water supply valve 205 is opened and raw water is supplied to the second tank 200 again.

[0034] Next, control is performed based on the flowchart in Figure 6. As described above, when the water in the tank is completely replaced (Figure 6, step S201), counter C is reset (Figure 6, step S202). Next, after switch member 18 detects that aluminum part 12 has been set in washer 15 (Figure 6, step S203: YES), washer 15 operates to wash aluminum part 12. When switch member 18 operates, 1 is added to the count of counter C (Figure 6, step S205). Since the count of counter C is currently 1, the count is equal to or less than the specified number of times (see paragraph number

[0030] ) (Figure 6, step S206: YES), and processing returns to step S203 in Figure 6.

[0035] In this way, each time a new aluminum part 12 is set in the washer 15 and cleaning is performed, the processes from step S203 to step S206 in Fig. 6 are repeatedly executed. Then, when the integrated value of counter C, which indicates the number of times that aluminum parts 12 have been set by switch member 18, exceeds a predetermined number (NO in step S206 in Fig. 6), a process for replacing the water in the tank is executed (step S110 in Fig. 6, steps S110 to S116 in Fig. 7). Here, after the control based on the flowchart in Fig. 6 has been executed a predetermined number of times, the control based on the flowchart in Fig. 5 is executed. As a result, a contamination determination of the post-filtration cleaning wastewater W2 is performed using saccharimeter 40, and the predetermined number of times, which serves as a criterion for determining contamination, is checked.

[0036] <Regarding the correspondence between the terms used in this embodiment and the terms used in the present invention> The suction filters 102, 202 and the bag filter 22f in this embodiment correspond to the filters of the present invention. The switch member 18 corresponds to the part detection means of the present invention. Furthermore, the first valve 104, the second valve 204, the water supply valve 205, the level gauge 207, and the control unit 30 correspond to the tank water replacement device.

[0037] <Advantages of the cleaning equipment 10 according to this embodiment> The washing equipment 10 according to this embodiment includes a water exchanger that determines that the wash water is contaminated when the integrated value of the counter C exceeds a predetermined number of times, discharges the wash wastewater W1 from the first tank 100 and the filtered wash wastewater W2 from the second tank 200, and supplies raw water to the second tank 200. This allows for the determination of wash water contamination and tank water exchange without the use of expensive sensors. The predetermined number of times that serves as the basis for water exchange is set based on the integrated value of the counter C when the oil concentration of the sampled filtered wash wastewater W2 exceeds an allowable value. This allows for the water exchange in the tank to be timed appropriately. The oil concentration of the filtered wash wastewater W2 is detected using a saccharometer. This allows for the oil concentration of the filtered wash wastewater, i.e., the degree of wash water contamination, to be detected using an inexpensive instrument. Furthermore, the filtered wash wastewater from the second tank can be automatically exchanged for raw water, thereby reducing labor costs.

[0038] Here, the present invention is not limited to the above-described embodiment, and modifications are possible within the scope of the present invention. For example, in this embodiment, the switch member 18 is illustrated as an example of a part detection means for detecting that the aluminum part 12 has been set in the washer 15. However, a photoelectric switch, a proximity switch, or the like can be used instead of the switch member 18. Furthermore, in this embodiment, an example is shown in which the switch member 18 is attached to the shelf portion 17 on which the aluminum part 12 is placed, but a configuration in which a limit switch or the like is attached to a hook or the like from which the aluminum part 12 is hung is also possible. [Explanation of symbols]

[0039] 10. Cleaning equipment 12. Aluminum parts 15. Washing machine 18. Switch member (part detection means) 22f···Bag filter (filter) 30... Control unit (water exchange device) 40...Saccharimeter 100···1st Tank 102 Suction filter (filter) 104: First valve (water exchange device) 200...Second Tank 202···Suction filter (filter) 204... Second valve (water exchange device) 205···Water supply valve (water replacement device) 207···Level meter C····Counter W1: Washing wastewater W2: Post-filtration cleaning wastewater

Claims

1. A cleaning facility comprising: a cleaning machine that cleans machined parts with cleaning water; a first tank that stores cleaning wastewater discharged from the cleaning machine; and a second tank that stores filtered cleaning wastewater that is pressure-fed from the first tank through a filter, and the filtered cleaning wastewater that is pressure-fed from the second tank through the filter is supplied to the cleaning machine as cleaning water, a part detection means for detecting that the part has been set in the washer when the part is to be washed; a counter that counts the number of times the part is set in the washer by the part detection means; a water exchanger that determines that the wash water is contaminated when the integrated value of the counter exceeds a specified number of times, and discharges the wash wastewater from the first tank and the filtered wash wastewater from the second tank, and supplies raw water to the second tank; Cleaning equipment with

2. 2. The cleaning equipment according to claim 1, The water replacement device is provided with a control unit, and the control unit stores a specified number of times that is a criterion for determining whether the wash water is dirty, The specified number of times is set based on the integrated value of the counter when the oil concentration of the sampled post-filtration cleaning wastewater exceeds the allowable value.

3. The cleaning equipment according to claim 2, The oil concentration of the post-filtration washing wastewater is detected using a saccharometer.

4. 2. The cleaning equipment according to claim 1, The water exchanger is a first valve for discharging the flushing wastewater stored in the first tank; a second valve for discharging the post-filter cleaning wastewater stored in the second tank; a water supply valve for supplying raw water to the second tank; a level meter capable of detecting the liquid level of the second tank; It has The control unit operates a first valve, a second valve, and a water supply valve based on a signal from the level meter.

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