JPH0347579A - Method for washing electronic machinery member - Google Patents

Abstract

PURPOSE:To certainly prevent secondary contamination by preventing the re- adhesion of extraneous matter to a washed surface by spraying ice particles to the surface to be washed of an electric machinery member at a high speed by non-combustible gas to wash the same. CONSTITUTION:Liquid nitrogen is injected from the third nozzle 16 to cool the interior of a main nozzle 13 to minus low temp. and the pure water injected in a mist form from the first nozzle 14 is formed into ice particles and, further, the liquefied carbon dioxide (dry ice) injected from the second nozzle 15 is also formed into particles and these particles are injected to a hoop material 10 from the main nozzle 13. By this method, the extraneous matter of the hoop material 10 is blown off and removed to wash said hoop material 10 and the re-adhesion of the extraneous matter to the washed surface is avoided to prevent secondary contamination.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a method for cleaning electrical equipment members, and more particularly, to a method for cleaning electrical equipment members, such as removing deposits on the surface of a contact piece. Regarding cleaning method.

(b) Conventional technology In general, in electrical devices such as relay switches, if there is deposits made of organic substances on the surface of the contact pieces fixed to the contact terminals, etc., not only will the initial contact resistance increase, but also the initial contact resistance will increase. , poor contact is likely to occur even during use.

Especially for electrical contacts used in signal relays and switches, the signal voltage and current when opening and closing the contacts are weak, so if even a small amount of organic material adheres to the surface of the contact piece, contact failure will occur. do.

For this reason, the surfaces of contact pieces such as signal relays are required to have a higher degree of cleaning than relays that switch on and off high power.

Conventional cleaning methods that attempt to meet such requirements include, for example,
A wet cleaning method is known in which cleaning is performed in a cleaning tank using ultrasonic waves with an organic solvent such as Freon.

(c) Problems to be Solved by the Invention However, with the above-mentioned wet cleaning method, it is difficult to remove deposits that do not dissolve in the cleaning solution, especially organic substances, and deposits that have been removed by cleaning with the cleaning solution may re-adhere. Since secondary contamination is likely to occur, it has been difficult to completely remove deposits from the contact surfaces of objects to be cleaned.

In addition, since organic solvent cleaning solutions such as Freon destroy the ozone layer, they are subject to usage regulations and have the problem of being difficult to use.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for cleaning electrical equipment members that can completely clean an object to be cleaned without worrying about secondary contamination and without being subject to restrictions on use.

(d) Problems to be Solved by the Invention The first invention of the present invention is a method for cleaning electrical equipment parts by spraying ice particles at high speed with a nonflammable gas onto the surface of the electrical equipment parts to be cleaned. be.

A second invention of the present invention is a method of cleaning an electrical equipment member by spraying ice particles and sublimate particles with a nonflammable gas at high speed onto the surface of the electrical equipment member to be cleaned.

(E) Effect According to the present invention, deposits on the surface of electrical equipment members are scattered and removed by the energy generated by spraying ice particles or ice particles and sublimate particles with a nonflammable gas at high speed.

(f) Effects of the invention This invention uses water particles, ice particles, and sublimate particles such as dry ice to remove deposits of organic and inorganic substances, resulting in the following effects. .

Since the deposits are blown off and removed together with the ice particles or ice particles and sublimate particles, the deposits do not re-adhere to the cleaning surface and secondary contamination is reliably prevented.

Unlike conventional methods, there is no need to install a large cleaning tank.
It is possible to prevent the above-mentioned secondary contamination within the cleaning tank, and at the same time prevent the device from becoming larger, and since there is no need to replace the cleaning liquid, continuous cleaning operations can be performed.

It is possible to reliably clean deposits without affecting the composition of the deposits, such as organic substances and inorganic substances.

A blasting effect is created when ice particles and sublimate particles collide with the contact surface, and by roughening the contact surface, contact stability is achieved through surface hardening.

It does not cause the problem of ozone layer depletion like conventional organic solvents.

(g) Examples An embodiment of the present invention will be described in detail below based on the drawings.

FIG. 1 shows a hoop material 10 having a contact piece as shown in FIG.
1 is a block diagram of a cleaning device for cleaning a material by the method of the present invention, in which a hoop material 10 to be cleaned is made up of a plurality of movable contact pieces 1.
The movable contact piece 11 is made of phosphor bronze and has contact pieces 12 and 12 arranged in parallel at predetermined intervals.The movable contact piece 11 has a twin contact structure in which the movable contact piece 11 is divided into two parts in the width direction and contact pieces 12 and 12 are each fixed by welding to the tip. ing.

In the cleaning device shown in FIG. 1, a main nozzle 13 for cleaning is provided with its ejection direction directed downward, and a transport path for the hoop material 10 is set below the main nozzle ↓3 in a lateral direction. ing.

Inside the main nozzle 13 mentioned above, there are three nozzles 14.
．． 15.16 are arranged collectively.

The first nozzle 14 supplies pure water from the pure water tank 17 to the pressurizer 1.
8 and sprays it out in the form of mist through a valve 19.

The second nozzle 15 jets out the liquefied carbon dioxide gas in the liquefied carbon dioxide tank 20 in the form of mist through the valves 21 and 22 and the nozzle regulator 23 .

The third nozzle 16 sprays liquefied nitrogen from the liquefied nitrogen tank 24 in the form of a mist through valves 25 and 26 and a nozzle regulator 27.

The above-mentioned nozzle adjusters 23.27 then adjust the vertical positions of the corresponding nozzles 15.16.

That is, when the third nozzle 16 spouts liquefied nitrogen,
Since the inside of the main nozzle 13 is cooled to a minus temperature, the mist of pure water ejected from the first nozzle 14 becomes ice particles, and furthermore, the liquefied carbon dioxide gas (dry ice) ejected from the second nozzle 15 turns into ice particles. ) also becomes particulate, and these particles are ejected from the main nozzle 13.

In addition, the size of each particle is 19.21 for each valve.
．． This can be changed by adjusting the opening amounts of the nozzles 22, 25, and 26, and further, fine graining can be adjusted by adjusting the vertical position of the nozzle 15, 16 using the nozzle adjuster 23, 27.

A fourth nozzle 28 is disposed downstream of the main nozzle 13 in the transport direction, and this nozzle 28 injects the liquefied nitrogen from the liquefied nitrogen tank 24 through the valve 25° 29.
Furthermore, the liquefied nitrogen is heated by the heater 30, so that
completely vaporized.

In the cleaning device configured as described above, the distance between the main nozzle 13 and the conveyance path of the hoop material 10 is set to 30 mm,
The ejection amount of the mixed particles is set to 10 m/sec, the conveyance speed of the hoop material 10 is set to 30 m@/sec, and the distance between the fourth nozzle 28 and the conveyance path is set to 10 mm. .

By setting in this manner and spraying mixed particles of ice particles and dry ice particles from the main nozzle 13 onto the hoop material 10 at high speed, deposits on the surface of the contact piece can be blown away and cleaned.

Further, the fourth nozzle 28 can spray completely vaporized nitrogen gas onto the hoop material 10 to dry the wetting caused by the sprayed ice particles.

In addition, cleaning with particles may be performed using only ice particles, and if dry ice particles (sublimate particles) are mixed and ejected, the resistivity of the ice particles is lowered and the electrostatic charge on the contacts caused by the ejection is prevented.

Since the deposits are blown off and removed together with the ice particles or ice particles and sublimate particles, the deposits do not re-adhere to the cleaning surface and secondary contamination is reliably prevented.

Unlike conventional methods, there is no need to install a large cleaning tank.
It is possible to prevent the above-mentioned secondary contamination within the cleaning tank, and at the same time prevent the device from becoming larger, and since there is no need to replace the cleaning liquid, continuous cleaning operations can be performed.

It is possible to reliably clean deposits without affecting the composition of the deposits, such as organic substances and inorganic substances.

A blasting effect is created when ice particles and sublimate particles collide with the contact surface, and by roughening the contact surface, contact stability is achieved through surface hardening.

It does not cause the problem of ozone layer depletion like conventional organic solvents.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, Figure 1 is a configuration diagram of the cleaning device. FIG. 2 is a plan view of the hoop material. 10... Hoop material 13... Main nozzle 14.15.16... Nozzle 17...Pure water tank 20...Liquefied carbon dioxide tank 24...Liquid nitrogen tank Barrel...Two Za 13...Noinnosuru Takeshi, 15.16... Zuzuru 17...tank around the corner i&! Lnpeng tu 7 Figure 2 Hoop cedar plan view 10... hoop n

Claims (2)

[Claims] (1) A method of cleaning electrical equipment parts by spraying ice particles with a nonflammable gas at high speed onto the surface of the electrical equipment parts to be cleaned. (2) A method of cleaning electrical equipment parts by spraying ice particles and sublimate particles at high speed with a nonflammable gas onto the surface of the electrical equipment parts to be cleaned.