Degreasing equipment

Abstract

To provide degreasing equipment capable of exerting a high cleaning effect.SOLUTION: Degreasing equipment comprises a degreasing tank 1 in which washing water and matter to be washed can be stored, a washing water supply line 20 and a washing water circulation line 30, which are connected to the degreasing tank 1, and an electromagnetic wave generator that is constituted to be capable of applying electromagnetic waves to the washing water.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a degreasing and cleaning device. [Background technology]

[0002] Conventionally, attempts have been made to improve the cleaning effect in degreasing and cleaning equipment used to remove oil and cutting chips adhering to machined ferrous and non-ferrous metal parts. For example, Patent Document 1 proposes providing a preliminary cleaning tank in front of the degreasing tank for spraying cleaning water onto the workpiece in a degreasing and cleaning equipment having a degreasing tank in which metal parts are degreased by immersing them in an alkaline solution, and a rinse layer in which the alkaline solution and scum adhering to the metal parts removed from the degreasing tank are removed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-247676 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional degreasing and cleaning apparatus provided with the above-mentioned preliminary cleaning tank, there was still room for improvement in the cleaning effect.

[0005] Therefore, an object of the present invention is to provide a degreasing and cleaning device capable of achieving a high cleaning effect. [Means for solving the problem]

[0006] The present invention has an object to advantageously solve the above-mentioned problems, and the degreasing and cleaning device of the present invention is a degreasing and cleaning device that degreases and cleans an object to be cleaned with cleaning water, and is characterized in that it comprises a degreasing tank capable of accommodating the cleaning water and the object to be cleaned therein, a cleaning water supply line and a cleaning water circulation line connected to the degreasing tank, and an electromagnetic wave generator configured to be able to irradiate the cleaning water with electromagnetic waves. In this way, a degreasing and cleaning device that degreases an object to be cleaned by cleaning the object with electromagnetic wave-treated cleaning water can exhibit a high cleaning effect.

[0007] Here, the degreasing and cleaning apparatus of the present invention preferably further comprises at least one spray nozzle capable of spraying the cleaning water onto the object to be cleaned, the spray nozzle being connected to at least one of the cleaning water supply line, the cleaning water circulation line, and a spray cleaning water pumping line connected to the degreasing tank, and the electromagnetic wave generating device being configured to be capable of irradiating the electromagnetic waves onto the cleaning water passing through the line to which the spray nozzle is connected.By configuring the apparatus so that the electromagnetic wave-treated cleaning water is sprayed onto the object to be cleaned via the spray nozzle, the cleaning effect of the object to be cleaned can be further improved.

[0008] Here, in the degreasing and cleaning apparatus of the present invention, it is preferable that the spray nozzle is connected to the spray cleaning water pumping line. If the degreasing and cleaning apparatus includes a spray cleaning water pumping line and a spray nozzle attached to the line, and the cleaning water sprayed onto the object to be cleaned through the spray nozzle is subjected to electromagnetic wave treatment, the cleaning effect of the object to be cleaned can be further improved. Effect of the Invention

[0009] According to the present invention, it is possible to provide a degreasing and cleaning device capable of achieving a high cleaning effect. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram showing a schematic configuration of an example of a degreasing and cleaning device according to the present invention; [Diagram 2] FIG. 2 is a diagram showing a schematic configuration of an example of an electromagnetic wave generating device provided in the degreasing and cleaning apparatus according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. The degreasing and cleaning device of the present invention is not particularly limited, and can be suitably used, for example, when a machined metal or nonmetallic object to be cleaned is degreased with a cleaning liquid or the like to remove oil, abrasive powder, cutting chips, and the like adhering to the object to be cleaned.

[0012] (Degreasing and cleaning equipment) The degreasing and cleaning apparatus of the present invention is a degreasing and cleaning apparatus that degreases the object by cleaning the object with cleaning water. The degreasing and cleaning apparatus of the present invention is characterized by comprising a degreasing tank capable of accommodating cleaning water and the object inside the tank, a cleaning water supply line and a cleaning water circulation line connected to the degreasing tank, and an electromagnetic wave generator configured to be able to irradiate electromagnetic waves to the cleaning water. In this way, a degreasing and cleaning apparatus that degreases the object by cleaning it with electromagnetic wave-treated cleaning water can exhibit a high cleaning effect.

[0013] The reason is not clear, but is presumed to be as follows. First, in the conventional degreasing and cleaning device using cleaning water (alkaline liquid) that has not been treated with electromagnetic waves, it is considered that 1) the saponification of oil using the alkaline liquid as the cleaning water, 2) the emulsification of the oil in the water by the soap component generated by the saponification, and 3) the wetting and dispersing action of the cleaning liquid containing the soap component generated by the saponification wetting the surface of the oil adhering to the object to be cleaned and further weakening the adhesion of the oil to the object to be cleaned, peeling the oil from the object to be cleaned and dispersing it in the cleaning liquid, were simultaneously occurring in multiple ways. Here, the oil, abrasive powder, cutting chips, etc., peeled off from the object to be cleaned in the degreasing tank tend to form aggregates, and such aggregates tend to accumulate on the bottom of the degreasing tank and form a sedimentary layer. Since such a sedimentary layer interacts with the cleaning liquid only on the surface of the sedimentary layer, the saponification action may not proceed sufficiently in the degreasing tank. As a result, the emulsification action and the wetting and dispersing action may not proceed sufficiently. In the degreasing and cleaning apparatus of the present invention, by using cleaning water that has been treated with electromagnetic waves, it is possible to suppress the formation of aggregates of oil, abrasive powder, cutting chips, etc. that have been peeled off from the object to be cleaned, and to allow the saponification action to proceed sufficiently. As a result, it is presumed that the emulsification action and wetting and dispersing action can also proceed sufficiently, thereby achieving a high cleaning effect.

[0014] FIG. 1 shows a schematic configuration of an example of a degreasing and cleaning apparatus according to the present invention. The degreasing and cleaning apparatus 100 shown in FIG. 1 includes a degreasing tank 1, a cleaning water supply line 20, and a cleaning water circulation line 30. The degreasing and cleaning apparatus 100 further includes a cleaning water pumping line 40 for spraying, and at least one spray nozzle 41. The degreasing and cleaning apparatus 100 includes electromagnetic wave generators 10A to 10C as electromagnetic wave generators configured to be able to irradiate electromagnetic waves to the cleaning water. The mounting positions of the electromagnetic wave generators 10A to 10C are not limited to the embodiment shown in the figure. The degreasing and cleaning apparatus 100 further includes a transport device 50 configured to be able to transport the object W to be cleaned. Each component will be described in more detail below.

[0015] As the electromagnetic wave generators 10A to 10C that can be provided in the degreasing and cleaning apparatus 100, an electromagnetic wave generator having an electromagnetic wave oscillator 11 that irradiates the cleaning water with electromagnetic waves and an AC current generator 12 that passes an AC current through the electromagnetic wave oscillator 11 can be suitably used. The electromagnetic wave oscillator 11 is not particularly limited, and can be, for example, a coil. The coil may be installed in a pipe that forms various lines, or may be formed by winding a cable around the outer periphery of the pipe that forms various lines. FIG. 2 shows, as an example, the electromagnetic wave oscillator 11 formed by a cable coil formed by winding a cable around the outer periphery of the pipe that forms the cleaning water supply line 20, and the AC current generator 12 connected thereto. When the electromagnetic wave oscillator 11 is implemented as a cable coil wound around the outer periphery of the pipe, the pipe can be a low-permeability pipe made of a material with low magnetic permeability such as polyvinyl chloride resin (for example, a material with magnetic permeability less than 70%, preferably 50% or less).

[0016] The AC generator 12 is not particularly limited, and may be, for example, the devices described in JP 2011-255345 A or JP 2013-167160 A or the "Water Watcher" manufactured by Sylise Co., Ltd. Among them, the AC generator 12 is preferably an AC generator that generates an AC current such as a square wave or sine wave whose frequency changes over time, or an AC generator that generates an AC current of a single frequency or an AC current of two or more single frequencies different from each other, and more preferably an AC generator that generates an AC current of a single frequency or an AC current of two or more single frequencies different from each other.

[0017] In the degreasing and cleaning apparatus of the present invention, the frequency of the alternating current generated by the alternating current generator is not particularly limited and can be, for example, 10 Hz or more and 1 MHz or less. Furthermore, it is preferable that the magnetic flux density of the electromagnetic waves generated by the electromagnetic wave generator is 10 mG or more. The magnetic flux density can be measured on a cable constituting the electromagnetic wave oscillation unit of the electromagnetic wave oscillation mechanism.

[0018] The degreasing tank 1 is a tank configured to be capable of containing cleaning water and an object to be cleaned W. The cleaning water is not particularly limited, and an alkaline liquid obtained by dissolving an alkaline agent in a cleaning fluid such as water can be suitably used. The alkaline agent is not particularly limited, and examples thereof include aqueous solutions obtained by dissolving an alkaline agent such as sodium hydroxide (caustic soda) or sodium carbonate in water. Among these, from the viewpoint of further enhancing the cleaning effect of the degreasing and cleaning apparatus according to the present invention, it is preferable to use an aqueous sodium hydroxide solution as the cleaning liquid.

[0019] The cleaning water supply line 20 is a pipe for supplying cleaning water to the degreasing tank 1. The cleaning water supply line 20 includes an electromagnetic wave generator 10A, and may further include an alkaline agent supplying device 21. FIG. 1 shows an embodiment in which the electromagnetic wave generator 10A is disposed downstream of the position where the alkaline agent is supplied by the alkaline agent supplying device 21. In other words, FIG. 1 shows an embodiment in which the electromagnetic wave generator 10A is disposed so as to irradiate electromagnetic waves to cleaning water prepared by supplying an alkaline agent to water. However, the installation position of the electromagnetic wave generator 10A may be upstream of the position where the alkaline agent is supplied by the alkaline agent supplying device 21. In other words, the electromagnetic wave generator 10A may be disposed so as to irradiate electromagnetic waves to water before the alkaline agent is supplied.

[0020] The cleaning water circulation line 30 is connected to the degreasing tank 1, and is a pipe for sucking the cleaning water in the degreasing tank 1 and then flowing the cleaning water back into the degreasing tank 1. The cleaning water circulation line 30 includes a pump P1 capable of generating a driving force for circulating the cleaning water, and an electromagnetic wave generator 10B is provided in front or rear of the pump P1 (FIG. 1 shows an embodiment in which the electromagnetic wave generator 10B is provided in the front stage). If the electromagnetic wave generator 10B is provided in the front stage of the pump P1, it is possible to effectively prevent the occurrence of scale and clogging in the components in the rear stage of the installation position of the electromagnetic wave generator 10B including the pump P1. Furthermore, the cleaning water circulation line 30 may include a drain pipe 32 connected via a three-way valve 31. The cleaning water that has passed through the drain pipe 32 is drained from the degreasing tank 1 and can be used for a post-treatment process such as wastewater treatment. Furthermore, the cleaning water circulation line 30 may include a heat exchanger 33. The temperature of the cleaning water can be adjusted to an appropriate temperature by the heat exchanger 33, thereby further improving the cleaning efficiency. The temperature of the cleaning water heat-exchanged by the heat exchanger 33 is, for example, preferably 30° C. or higher, and more preferably 50° C. or higher. Furthermore, the cleaning water circulation line 30 may be equipped with a measuring device 34, which may be one or more types of measuring devices capable of measuring various attributes of the cleaning water flowing through the cleaning water circulation line 30. For example, the measuring device 34 may be at least one type of measuring device selected from a pH meter, a conductivity meter, an alkalinity meter, and the like.

[0021] The spray cleaning water pumping line 40 is a pipe for pumping up cleaning water to be sprayed from the spray nozzle 41 from inside the degreasing tank 1. The spray cleaning water pumping line 40 is provided with a pump P2 capable of generating a driving force for pumping up cleaning water from inside the degreasing tank 1 and supplying it to the spray nozzle 41, and is provided with an electromagnetic wave generator 10C in front or rear of the pump P2 (FIG. 1 shows an embodiment in which the electromagnetic wave generator 10C is disposed in the front stage). If the electromagnetic wave generator 10C is provided in front of the pump P2, it is possible to effectively prevent the occurrence of scale and clogging in the components in the rear stage from the mounting position of the electromagnetic wave generator 10C including the pump P2. Furthermore, the cleaning water flowing through the spray cleaning water pumping line 40 can be sprayed onto the object to be washed W through the spray nozzle 41. FIG. 1 shows a structure in which four spray nozzles 41 are connected in series as an example, but the number and arrangement of the spray nozzles 41 are not limited to those shown in the figure, and may be any number and arrangement.

[0022] 1 shows an example of the degreasing and cleaning apparatus 100 in which the spray nozzle 41 is attached to the spray cleaning water pumping line 40, but the degreasing and cleaning apparatus of the present invention is not limited to this example. For example, a spray nozzle may be attached to both or at least one of the cleaning water supply line 20 and the cleaning water circulation line 30. Even in this case, it is preferable that an electromagnetic wave generator is attached to the line to which the spray nozzle is attached, upstream of the spray nozzle. This is because the cleaning effect can be dramatically improved by spraying the cleaning water that has been subjected to electromagnetic wave treatment onto the object W to be cleaned.

[0023] The degreasing and cleaning apparatus 100 shown in FIG. 1 includes a transport device 50. The transport device 50 includes a rail 51, a dolly 52, a hoist 53, and a chuck 54. The object W to be cleaned is gripped by the chuck 54, and the dolly 52 slides along the rail 51, so that the object W to be cleaned is transported to a desired position. The dolly 52 is stopped at a desired position (for example, directly above the degreasing tank 1), and the hoist 53 is controlled to lower the object W to be cleaned, so that the object W to be cleaned can be immersed in the degreasing tank 1. The chuck 54 is opened while the object W to be cleaned is immersed in the degreasing tank 1, so that the object W to be cleaned can be placed in the degreasing tank 1. When the object W to be cleaned is to be lifted from the degreasing tank 1, the above-mentioned operations can be reversed.

[0024] Although the degreasing and cleaning apparatus of the present invention has been described above, the degreasing and cleaning apparatus of the present invention is not limited to the above. Specifically, while Fig. 1 shows an embodiment in which the electromagnetic wave generators 10A to 10C are attached to the degreasing and cleaning apparatus 100, the degreasing and cleaning apparatus of the present invention may have at least one electromagnetic wave generator. 1 shows an embodiment in which the degreasing and cleaning apparatus 100 includes the spray cleaning water pumping line 40 and the spray nozzle 41 attached to the end thereof, but the degreasing and cleaning apparatus does not necessarily have to include the spray cleaning water pumping line. In such an embodiment, the spray nozzle may be attached to both or at least one of the cleaning water supply line and the cleaning water circulation line. 1 shows an embodiment in which the degreasing and cleaning apparatus 100 is provided with the cleaning water supply line 20 having the alkaline agent supply device 21, but the cleaning water supply line provided in the degreasing and cleaning apparatus does not have to have an alkaline agent supply device. In this case, makeup water is supplied as cleaning water from the cleaning water supply line, and an alkaline agent can be supplied to the degreasing tank via a separate supplying means provided in the degreasing and cleaning apparatus (for example, an alkaline agent supplying line separately connected to the degreasing tank). Even when such a configuration is adopted, the degreasing and cleaning apparatus of the present invention can achieve a high cleaning effect. EXAMPLES

[0025] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples.

[0026] Example 1 A degreasing and cleaning apparatus having the same configuration as the degreasing and cleaning apparatus 100 shown in FIG. 1 was used. Specifically, a cable was wound around the outer circumference of the piping constituting each of the cleaning water supply line, the cleaning water circulation line, and the cleaning water pumping line for spraying at the positions shown in FIG. 1 (the installation positions of the electromagnetic wave generators 10A to 10C) to form a cable coil. The cable was also connected to a water watcher (HP type, manufactured by Cyrise Co., Ltd.) as an AC current generator to constitute an electromagnetic wave generator. That is, in this embodiment, the cleaning water supplied to the degreasing tank through the cleaning water supply line, the cleaning water circulated in the degreasing tank through the cleaning water circulation line, and the cleaning water sprayed to the object to be cleaned through the spray nozzle assembled in the cleaning water pumping line for spraying were all subjected to electromagnetic wave treatment before use. The object to be cleaned was an automobile part obtained by cutting and slicing a steel plate using processing oil (FGM427PR, manufactured by Yusiro Chemical Industry Co., Ltd.). The objects to be cleaned were 100 large parts with a size of 4800 L and 100 medium-sized parts with a size of 2700 L. A sodium hydroxide solution prepared by dissolving sodium hydroxide in tap water at a concentration of 2% by mass was poured into the degreasing tank as the cleaning water. The spray pressure when spraying the cleaning liquid from the spray nozzle was 0.05 to 0.10 MPa, the spray time was 15 seconds, and the immersion time in the degreasing tank was 3 to 5 minutes. The measured values ​​(pH value, EC value) measured by a pH meter (HM-30P, manufactured by Toa DKK Co., Ltd.) and an EC meter (CM-3P, manufactured by Toa DKK Co., Ltd.) installed in the cleaning water circulation line at the time when the electromagnetic wave treatment of the cleaning water started and 3 hours after the start of the electromagnetic wave treatment of the cleaning water were compared. The value of (measured value after 3 hours) minus (measured value at the start) was -0.09 for pH and -1.4 for EC.

[0027] The objects degreased and washed as described above were subjected to electrodeposition coating at 200 V for 3 to 5 minutes using Electron KG400 (manufactured by Kansai Paint Co., Ltd.) as an electrodeposition paint to obtain coated objects.

[0028] The resulting painted objects were then visually and manually inspected for five defects: water marks, cratering, dripping, stains, and other paint defects. Any painted object that met any of these criteria was judged to be an "electrodeposition defective item," and the "electrodeposition defect rate (%)," which is the percentage of electrodeposition defective items out of all painted objects (100 large parts and 100 medium-sized parts), was calculated. The results are shown in Table 1.

[0029] Example 2 The object to be cleaned was cleaned in the same manner as in Example 1, except that the spray cleaning water pumping line and the spray nozzle were not used, and the obtained object to be cleaned was electrochemically coated to obtain a coated object. In other words, in this example, an electromagnetically treated cleaning liquid was used as the cleaning water supplied to the degreasing tank via the cleaning water supply line and the cleaning water circulated in the degreasing tank via the cleaning water circulation line, and the cleaning liquid was not sprayed onto the object to be cleaned via a spray nozzle. Then, the electrodeposition failure rate was calculated in the same manner as in Example 1. The results are shown in Table 1. The values ​​of (measured value after 3 hours) - (measured value at the start) measured and calculated in the same manner as in Example 1 were pH -0.02 and EC -0.2.

[0030] Comparative Example 1 The object to be cleaned was cleaned in the same manner as in Example 1, except that the electromagnetic wave generator was not started and the cleaning water pumping line for spraying and the spray nozzle were not used, and the obtained object to be cleaned was subjected to electrodeposition coating to obtain a coated object. Then, the electrodeposition failure rate was calculated in the same manner as in Example 1. The results are shown in Table 1. The pH value and EC value were measured at the start of the cleaning operation using the degreasing cleaning device and 3 hours after the start in the same manner as in Example 1, and the value of (3-hour measurement value) - (measurement value at the start) was calculated, whereby the pH value was 0.02 and the EC value was 0.2.

[0031] [Table 1]

[0032] From the above Examples 1 and 2 and Comparative Example 1, it can be seen that the degreasing and cleaning device, which degreases the object by cleaning it with electromagnetic wave-treated cleaning water, can achieve a high cleaning effect and can effectively reduce the coating defect rate when the resulting object is electrocoated. In addition, in the above Examples 1 and 2, the difference values ​​of the pH and EC values ​​measured at two predetermined time points are negative values, unlike the values ​​in Comparative Example 1. This means that in Examples 1 and 2, which used a cleaning solution that had been subjected to electromagnetic wave treatment, the pH and EC values ​​decreased after the start of electromagnetic wave irradiation. This also shows that cleaning proceeded better in Examples 1 and 2 than in Comparative Example 1. [Industrial Applicability]

[0033] The degreasing and cleaning device of the present invention can achieve a high cleaning effect. [Explanation of symbols]

[0034] 1 Degreasing tank 10A~10C Electromagnetic wave generator 11 Electromagnetic wave oscillator 12 AC generator 20 Cleaning water supply line 21 Alkaline agent injection device 30 Cleaning water circulation line 31 Three-way valve 32 Drain pipe 33 Heat exchanger 34 Measuring Equipment 40 Spray cleaning water pumping line 41 Spray nozzle 50 Transport Equipment 51 Rail 52 Trolley 53 Hoist 54 Chuck P1, P2 pumps W Cleaning item 100 Degreasing and cleaning equipment

Claims

1. A degreasing and cleaning device that degreases and cleans an object to be cleaned with cleaning water, The object to be cleaned is a part for electrocoating obtained by cutting or slicing a steel plate, and has oil, abrasive powder, or cutting chips attached thereto; The degreasing and cleaning device is a degreasing tank capable of accommodating cleaning water, which is an aqueous solution in which sodium hydroxide or sodium carbonate is dissolved, and an object to be cleaned; a cleaning water supply line and a cleaning water circulation line connected to the degreasing tank; An electromagnetic wave generating device configured to be able to irradiate electromagnetic waves to the cleaning water, The electromagnetic wave generating device includes an electromagnetic wave oscillator and an AC current generator that applies an AC current having a frequency of 10 Hz to 1 MHz to the electromagnetic wave oscillator, thereby causing the electromagnetic wave oscillator to oscillate an electromagnetic wave having a magnetic flux density of 10 mG or more; The electromagnetic wave generating device is The cleaning water supply line and the cleaning water circulation line are configured to be capable of irradiating electromagnetic waves to the cleaning water passing through the cleaning water supply line and the cleaning water circulation line, and the oil, the abrasive powder, or the cutting chips peeled off from the object to be cleaned by the degreasing cleaning can be prevented from forming an aggregate in the degreasing tank. Degreasing and cleaning equipment.

2. The degreasing and cleaning apparatus further includes at least one spray nozzle capable of spraying the cleaning water onto the object to be cleaned, the spray nozzle is connected to a spray cleaning water pumping line connected to the degreasing tank, The electromagnetic wave generating device is configured to be capable of irradiating the electromagnetic waves to the cleaning water passing through the spray cleaning water pumping line. The degreasing and cleaning apparatus according to claim 1.

3. The cleaning water circulation line further includes at least one of a pump and a heat exchanger, The electromagnetic wave generating device is configured to be capable of irradiating electromagnetic waves to the cleaning water passing through the cleaning water circulation line at a stage upstream of the pump and the heat exchanger. The degreasing and cleaning device according to claim 1 or 2.

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