JPH0975875A - Cleaning device for processed product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning device for processed products for separating unnecessary solid matters, oil and the like contained in a cleaning fluid in a good manner. SOLUTION: In a cleaning device for processed products comprising a cleaning tank 11 filled with a cleaning fluid for processed products, a filter device 13 for separating solid matters from the fluid overflowing the cleaning tank 11 and an oil-water separation device 15 for separating oil from the cleaning fluid overflowing the cleaning tank 11, a bag filter is utilized as the filter device 13, and an ultrafiltration film device is utilized as the oil-water separation device 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cleaning a processed part, such as an electron gun part for a cathode ray tube, which cleans, for example, a pressed processed part.

[0002]

2. Description of the Related Art A conventional machined part cleaning apparatus for cleaning a machined part that has undergone press working is constructed as follows.

For example, the processed parts are cleaned in a cleaning tank filled with a cleaning liquid. Then, the cleaning liquid overflowing from the cleaning tank is sent to the filter device. In the filter device, solid dust such as metal powder generated by press wear is removed. Also,
The cleaning liquid from which the solid dust has been removed is sent to the oil / water separation device, and the oil dissolved in the cleaning liquid is separated. Thus, the cleaning liquid from which dust has been removed and the oil has been separated is returned to the cleaning tank as a regenerated cleaning liquid. The oil separated by the oil / water separator is disposed of as a waste liquid.

[0004]

By the way, in the apparatus for cleaning a processed component having the above-mentioned structure, a wound filter is used as a filter device. The thread winding filter has a structure in which a thin thread of fiber or resin is wound around a core in which a large number of holes are formed. When a thread winding filter is used in the washing device for pressed parts, solid dust mixed with detergent (surfactant) or oil is pushed by the pressure of the pump to spread the thread wound in a twill pattern. Acts on
Garbage slips through. Therefore, the solid matter is not sufficiently removed. In such a case, for example, the pressure of the pump may be lowered so that the yarn of the wound filter does not spread. However, if the pressure of the pump is lowered, the flow of the cleaning liquid becomes weak and the effect as a filter is lost.

A resin adsorption system is usually used as the oil-water separator. The resin adsorption method is a method in which a cleaning liquid mixed with oil is passed through a large population of rice grain-sized polypropylene, and the oil is adsorbed to the polypropylene particles to separate the cleaning liquid and the oil. In this case, a so-called specific gravity separation method, which utilizes the difference in specific gravity of oil and water, is adopted for the separation of the cleaning liquid and the oil.

For example, oil particles adsorbed on polypropylene particles are gradually coarsened. Then, the coarsened oil particles finally separate from the polypropylene particles and float. In such a resin adsorption method, a large difference in specific gravity is required between the oil to be separated and the cleaning liquid.

Therefore, in the case of the cleaning device for cleaning the processed parts, if the resin adsorption method is used as the oil / water separating device, there are the following problems.

1) The processing oil used for deep drawing in press working contains chlorine as an extreme pressure additive and has a specific gravity of 1 to 1.1, which is close to that of a cleaning liquid, and separation using the difference in specific gravity is difficult.

2) The lubricating oil film adhering to the surface during the press-hardening cannot be removed only by the saponification action of the alkaline detergent. Therefore, the cleaning liquid contains a surfactant having a solubilizing effect. In this case, the removed oil is dissolved in the cleaning liquid by the surfactant and emulsified to form an emulsion. Emulsion is a combination of cleaning liquid and oil, and it becomes difficult to remove oil by the resin adsorption method.

The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a cleaning device for machined parts which can favorably separate unnecessary solids, oils and the like contained in the cleaning liquid.

[0011]

According to the present invention, there is provided a cleaning tank in which a cleaning liquid for cleaning a processed part is injected, a filter device for separating solids from the cleaning liquid overflowing from the cleaning tank, and the cleaning tank. In a cleaning device for a processed part, which includes an oil / water separator for separating oil from overflowed cleaning liquid, a bag filter is used as the filter device, and an ultrafiltration membrane device is used as the oil / water separator.

Further, the bag filter is located upstream of the ultrafiltration membrane device.

According to the above construction, the bag filter is used as the filter device for separating the solid dust. Since the bag filter has a multi-layered structure, it has a high ability to retain dust even when the flow rate is high and the pressure is high, and the dust removal performance is improved.

An ultrafiltration membrane device is used as an oil / water separator. The ultrafiltration membrane device uses a special membrane that allows water to pass but not oil or solids. This device is
Since the method does not utilize the difference in specific gravity between the oil and the cleaning liquid, the separation performance between the oil and the cleaning liquid improves.

The ultrafiltration membrane device has a function of holding solids other than oil, such as dust, but if dust or the like adheres, the service life will be shortened. Therefore, the life of the ultrafiltration membrane device can be extended by connecting the ultrafiltration membrane device after the bag filter.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG.

Reference numeral 11 is a cleaning tank, and a cleaning liquid for cleaning the processed parts is injected into the cleaning tank 11. Also, the cleaning tank 11
The cleaning liquid overflowing from is sent to the intermediate storage tank 12. The cleaning liquid sent to the intermediate storage tank 12 is the filter device 1
Passed through 3. In the filter device 13, solid dust such as metal powder generated by press wear is removed. The cleaning liquid from which the solid dust has been removed is sent to the oil / water separator 15 by the pump 14. In the oil / water separator 15, the oil dissolved in the cleaning liquid is separated from the cleaning liquid. Further, the cleaning liquid from which the oil has been separated is returned to the cleaning tank 11 as a regenerated cleaning liquid as indicated by an arrow Y1. The oil separated by the oil / water separator 15 is sent to the outside as a waste liquid for disposal as indicated by arrow Y2.

A bag filter is used as the filter device 13 in the above-described cleaning device. As shown in FIG. 2, the bag filter has a bag-like structure as a whole, and the material forming the bag is, for example, a bypass layer 21 that prevents clogging at an early stage and a transport that uniformly takes in a cleaning liquid into the bag. The layer 22 and the outer filter layer 23 have a three-layer structure. Then, the cleaning liquid enters from the upper opening 24, and each layer 21 to 23 constituting the bag
By this, solid dust is removed, and the dust-free cleaning liquid flows out to the outside.

The bag filter is superior to other filter devices in terms of cost and performance such as initial cost and running cost. For example, in the case of the wound filter used in the conventional device, the amount of dust remaining in the cleaning liquid is 100
It was mg / 100cc, but in the case of a bag filter,
It has dropped to 50 mg / 100 cc or less.

An ultrafiltration membrane device is used as the oil / water separator. As shown in FIG. 3, the ultrafiltration membrane device has a structure in which a cleaning liquid is passed through a passage formed by an ultrafiltration membrane 31 such as a collodion membrane, a gelatin membrane, or a cellophane membrane. For example, if the cleaning liquid is indicated by a white circle and the oil is indicated by a black circle, the cleaning liquid enters from the left side of the figure. At this time, the oil (black circle) cannot pass through the ultrafiltration membrane 31 and proceeds as it is, passing through to the right. The cleaning liquid (white circle) passes through the ultrafiltration membrane 31. In this way, the oil (black circle) and the cleaning liquid (white circle) are separated.

By using an ultrafiltration membrane device,
The oil could be easily separated from the emulsified cleaning waste liquid. For example, as shown in FIG. 4, the concentration of oil in the cleaning liquid (one of the indicators of deterioration of the cleaning liquid, represented by oil weight / cleaning liquid weight (%)) is 0.9% or less, and the amount of waste liquid Could be halved. The horizontal axis of FIG. 4 is (day), and the vertical axis is the oil concentration (%). The measurement period is indicated by T.

In the case of a voltage application method that is not an ultrafiltration membrane method, or a method that combines a resin adsorption method and a voltage application method, it is difficult to separate oil from the emulsified cleaning waste liquid, and the characteristics of oil concentration are It is as shown in FIG. Also in FIG. 5, the horizontal axis is the day and the vertical axis is the oil concentration (%).
It is. In this case, the oil content (%) increases as the amount of washing increases.
Is increasing daily and is around 1.5%.

Here, as a filter, a spool filter,
Alternatively, Table 1 shows the measurement results when a bag filter is used and these are combined with an ultrafiltration membrane device.

(Table 1) (Combination) (Membrane cleaning) (Liquid regeneration amount) (Life) Wound filter and ultrafiltration membrane every 2 hours 10 l / h 3 months Bag filter and ultrafiltration membrane every 7 hours 25 l / h Approximately 1 year Membrane cleaning is cleaning performed when impurities adhere to the ultrafiltration membrane of the ultrafiltration membrane device. The combination of the bag filter and the ultrafiltration membrane device is membrane cleaning or liquid regeneration. Excellent in both quantity and life.

When the wound filter is used, dust passes through the filter, so that the amount of impurities attached to the ultrafiltration membrane increases and the cleaning frequency increases. Therefore, the liquid regeneration amount also decreases. In addition, the extra life is shortened because an extra load is applied to the ultrafiltration membrane.

In the above-described embodiment of FIG. 1, the bag filter is connected between the intermediate storage tank and the oil / water separator. However, it is also possible to connect the bag filter directly to the cleaning bath. If the bag filter is connected between the intermediate storage tank and the oil / water separator and further connected to the cleaning tank, the impurities can be removed more effectively.

[0027]

According to the present invention, it is possible to realize a cleaning device for machined parts, which can easily remove impurities and separate oil from the cleaning liquid and can effectively regenerate the cleaning liquid.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is a view showing a bag filter used in the present invention.

FIG. 3 is a diagram illustrating an ultrafiltration membrane device used in the present invention.

FIG. 4 is a diagram illustrating characteristics of the present invention.

FIG. 5 is a diagram illustrating characteristics of a conventional example.

[Explanation of symbols]

 11 ... Washing tank 12 ... Intermediate storage tank 13 ... Filter device 14 ... Pump 15 ... Oil-water separation device

Claims (2)

[Claims] 1. A cleaning tank into which a cleaning liquid for cleaning a processed part is injected, a filter device for separating solids from the cleaning liquid overflowing from the cleaning tank, and an oil from the cleaning liquid overflowing from the cleaning tank. An apparatus for cleaning processed parts, comprising: an oil-water separation device for separation; and a bag filter used as the filter device, and an ultrafiltration membrane device used as the oil-water separation device. 2. The apparatus for cleaning a processed part according to claim 1, wherein the bag filter is located in front of the ultrafiltration membrane device.