JPS63217263A - Surface treating method - Google Patents

Abstract

PURPOSE:To enable corrosion prevention and insulation by coating the contacting surface between the internal surface of a buffer tank and liquid with fluororesin and interposing a spacer made of fluororesin between the bolt and nut of a buffer tank fitting part. CONSTITUTION:The buffer tank consists of components such as 1st and 2nd cylinders 1 and 2 and a cylinder cover 3. Then the contacting surface between the buffer tank internal surface and liquid is coated with the fluororesin. Further, a tube made of fluororesin is inserted into the fitting hole of a port 9 for putting the liquid in the buffer tank, and the coated internal surface of the buffer tank is welded to the end part of the spacer. Further, the spacers made of the fluororesin are fitted to the contacting surfaces between a bolt 7 and a nut, and a bolt 12 and a nut 13 respectively. Thus, the contacting surfaces between the buffer internal surface and liquid and the contacting parts between the bolts and nuts are protected against corrosion and insulated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a surface treatment method, and is particularly used for insulation and corrosion protection of a buff 7 tank of an electrophoresis apparatus.

[Conventional technology and problems] An electrophoresis device electrically separates proteins, II cells, etc.
The purpose is to efficiently produce pharmaceuticals and other products with high precision.It is installed in the Space Lab aboard the Space Shuttle, and Japanese scientists and engineers are on board to produce primary materials. Experimental design (FMPT: First
This is one of the devices used for material processing laboratory testing.

Conventionally, the tank section of the electrophoresis apparatus is made of aluminum alloy in order to reduce the weight of the tank, has a cylindrical partition wall, and has a structure in which three types of liquids are injected from three boats. Additionally, to prevent the tank body from being corroded by the liquid injected into the tank, the entire surface of the tank is treated with alumite (a type of surface treatment).

However, since current flows through the liquid in the tank, it is necessary to completely insulate the connected parts, and the alumite treatment described above did not provide sufficient insulation.

Additionally, during assembly and disassembly work, the alumite treated film peeled off at the contact areas of bolts and nuts, reducing insulation.

The present invention was made in view of the above circumstances, and is a surface treatment method that enables corrosion and insulation at the contact surface between the inner surface of a buffer tank and liquid, and also maintains insulation at the contact portion of bolts and nuts. The purpose is to provide

[Means and effects for solving the problems] The present invention provides a film treatment method for insulating and preventing corrosion of a buffer tank of an electrophoresis device, in which the inner surface of the buffer tank and the contact surface with the liquid are coated with a fluororesin, Moreover, the gist of the installation of the buff 7 tank is to insert a spacer made of fluororesin into the contact surface of the bolt and nut.

According to the present invention, since the contact surface between the inner surface of the buffer tank and the liquid is coated with a fluororesin, corrosion protection and insulation can be obtained at the contact surface. Furthermore, when installing the buff 7 tank, a spacer made of fluororesin is inserted between the contact surfaces of the bolts and nuts to prevent the coating from peeling off and provide corrosion protection and insulation.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 6. Here, FIG. 1 is a front view of the buffer tank of the electrophoresis apparatus, FIG. 2 is a sectional view of FIG. 1 showing the inner surface of the buffer tank, and FIG. 4 is a detailed view of part B in Fig. 2, and Fig. 5 is a detailed view of section B in Fig. 1.
FIG. 6, which is a detailed view of part 0 in the figure, is a sectional view taken along the line DD in FIG. 2.

As shown in FIGS. 1 and 2, the buffer tank according to the present invention is roughly divided into a first cylinder 1. second cylinder 2
A partition wall is formed by a sealing material (belofram) 6, which is composed of a cylinder cover 3 and a piston 4 sandwiched between a piston 4 and a retainer 5, and has a structure in which three types of liquids can enter. Note that the piston 4 and retainer 5
are integrally fastened with bolts, and Lr and L2 in Fig. 2
is the movement range (stroke) of the piston 4.

Moreover, the three types of liquids are Pl as shown in FIG.

P2. It is injected at the location indicated by the symbol Pl. Said first
The cylinder 1 and the cylinder cover 3 are tightened with four bolts 7 and nuts 8, and have a structure in which the second cylinder 2 is sandwiched (as shown in Figure 1).

In the present invention, first, the inner surface of the buffer tank and the contact surface with the liquid were coated with a fluorocarbon resin. This makes it possible to insulate and prevent contact between the inner surface of the buffer tank and the liquid. Also, a boat 9 for putting liquid into the tank.
For installation, a tube 10 made of fluorine resin was inserted into the hole as shown in FIG. 6, and the coated surface of the inner surface of the tank and the end 11 of the spacer (shown in FIG. 6) were welded together. This completely insulated the parts in contact with the liquid. Further, the bolt 7 and nut 8. A spacer 14 made of fluororesin is inserted between the contact surfaces of the bolts 12 and nuts 13 when the bolts 7 and 12 are installed, completely preventing the insulation and coating from peeling off during assembly and disassembly of the buff 7 tank. planned.

Therefore, according to the present invention, since the contact surface between the inner surface of the buff 7 tank and the liquid is coated with a fluororesin, corrosion protection and insulation can be obtained at the contact surface.

Furthermore, when attaching the buffer tank, a spacer 14 made of fluororesin is inserted between the contact surfaces of the bolts and nuts to prevent the coating from peeling off and provide corrosion protection and insulation.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to prevent corrosion and insulation at the contact surface between the inner surface of the buffer tank and the liquid, and prevent peeling of the coating at the contact portion of bolts and nuts, thereby preventing corrosion. and a surface treatment method that provides insulation.

[Brief explanation of the drawing]

FIG. 1 is a front view of the buffer tank 7 of the electrophoresis apparatus according to the present invention, FIG. 2 is a sectional view showing the inner surface of the buffer tank in FIG. 1, and FIG. 3 is taken along line A-A in FIG. 1. Cross section, 4th
5 is a detailed view of section B in FIG. 2, FIG. 5 is a detailed view of section 0 in FIG. 1, and FIG. 6 is a sectional view taken along line DD in FIG. 2. 1.2...Cylinder, 3...Cylinder cover, 4.
... Piston, 5... Retainer, 6... Seal material (
Verofram), 7.12...Volt, 8.13...
Natsuto, 9...Boat, 10...Tube, 12.
...End, 14...Spacer. Applicant's agent Patent attorney Takehiko Suzue Figure 4 Figure 3

Claims (1)

[Claims] In a surface treatment method for insulating and preventing corrosion of the buffer tank of an electrophoresis device, the inner surface of the buffer tank and the contact surface with the liquid are coated with fluorine resin, and the contact surface of the bolts and nuts of the buffer tank attachment part is coated with fluorine resin. A surface treatment method characterized by inserting a spacer consisting of.