JPS6343143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a two-component mixing device for mixing a base agent and a curing agent and sending the mixture to a spray gun.

(Prior Art) As shown in FIG. 1, a conventional two-liquid mixing device includes spaces 2 and 3 in which two check valves (not shown) are installed in a mixer block 1; A passage 4 through which the main agent flows from the cavity 2 of the mixer block 1 and a passage 5 through which the curing agent flows from the other cavity 5 are provided in the mixer block 1 so as to intersect from opposite lateral directions, and the intersection point of both passages 4 and 5 is provided. A conduit passage 6 extending perpendicularly to both passages 4 and 5 is provided in the mixer block 1, and the downstream side of this conduit passage 6 is connected to a static mixer pipe 7 connected to a spray gun. Are known.

According to the above-mentioned two-component mixing device, the base agent is sent from the passage 4 and the curing agent is sent from the passage 5, and these two liquids are combined and are provided in the conductive passage 6 and the static mixer pipe 7 in the longitudinal direction thereof. The mixture is mixed while passing through the spiral passage.

However, in the above-mentioned two-component mixing device, when the base resin and the curing agent collide and merge at the location where the passages 4 and 5 intersect, a turbulent flow may be formed and the base resin and curing agent may stagnate. If the mixing ratio with the curing agent deviates from the normal ratio, the base resin may react with the curing agent, resulting in curing and formation of lumps. The resulting lumps remained and accumulated in the apparatus, particularly in the conduit 6 and the static mixer tube 7, often making the apparatus unable to operate. For this reason, it is necessary to periodically disassemble and clean the mixing device itself once every two days in order to remove the lumps that have clogged inside the mixing device, and conventional two-component mixing devices require a lot of maintenance work. It was hot.

(Objective of the invention) The present invention is intended to solve the above-mentioned problem, and it is possible to mix the base resin and curing agent well so that the mixing ratio does not change from the normal ratio, thereby making continuous operation possible. The object of the present invention is to provide a two-liquid mixing device.

(Structure of the Invention) In order to achieve the above object, the two-component mixing device of the present invention provides separate passages through which the base resin and curing agent flow, and at least the downstream side of the passage through which the base resin flows. It is disposed coaxially inside the flowing passage, and the downstream ends of both passages are communicated with the static mixer pipe via a conductive passage, and the passages through which the base agent and the curing agent flow separately overlap each other. In the portion, the ratio of the cross-sectional area of the passage through which the curing agent flows, excluding the portion of the passage through which the base agent flows, to the cross-sectional area of the passage through which the base agent flows, is made approximately the same as the mixing ratio of the base agent and the curing agent; It is formed by enlarging a part of the conductive path.

(Operation of the invention) With this configuration, the base agent and the curing agent flow in the same direction through separate passages, and are brought into good contact and merging at the downstream ends of both passages at a proper mixing ratio. Therefore, the turbulence and stagnation phenomena that occur when two liquids collide, which conventionally occur when two liquids flow from opposite directions, do not occur. Furthermore, the two liquids that have joined together are in a kind of agitated state while passing through the enlarged diameter part of the conduit passage, and are mixed well, and even more well mixed when flowing through the static mixer pipe, so that the base agent and curing agent are mixed in the proper mixing ratio without producing any lumps.

(Example) An example of the present invention will be described below with reference to the drawings.

In Fig. 3, 11 is a mixer block;
2 is a space provided in the mixer block 11 for mounting a check valve (not shown) for the base agent, and 13 is a space provided in the mixer block 11 for mounting a check valve (not shown) for the curing agent. Cavities 14 and 15 are passages provided in the mixer block 11 through which the base agent and curing agent flow, respectively.

A passage 14 through which the main ingredient flows is formed by extending laterally within the mixer block 11 from the bottom of the cavity 12, and then bent at a right angle and extending downward, and its downstream portion is formed by a pipe 16.

On the other hand, the passage 15 through which the curing agent flows extends laterally from the bottom of the cavity 13 inside the mixer block 11 so as to be in contact with the outer peripheral surface of the pipe 16 forming a part of the passage 14 (see FIG. 3). Bend at a right angle,
It is formed to extend coaxially around the tube 16. Moreover, in the portion where the pipe 16 and the passage 15 overlap, the cross-sectional area of the pipe 16 and the pipe 16
The ratio of the cross-sectional area of the passage 15 excluding the cross-sectional area of the passage 15 is approximately the same as the mixing ratio of the main agent and the curing agent.

In this two-component mixing device, one end of the passage 14 through which the base resin flows is arranged inside the passage 15 through which the hardening agent flows, because if the arrangement is reversed, the mixing ratio of the base resin to the hardening agent will be high. The area is larger than when the passage 15 is on the outside, and the base agent, which has a higher viscosity than the curing agent, does not penetrate into the curing agent and therefore does not mix well with the curing agent, which may result in the formation of lumps. This is to eliminate the possibility of the generation of substances. The reason why the passage 15 is in contact with the outer circumferential surface of the tube 16 is to ensure that the curing agent flowing into the outer circumferential side of the tube 16 flows smoothly without stagnation.
This is to give rotation to the flow and cause the curing agent to flow in a spiral shape.

As shown in FIG. 4, the tip 16a of the tube 16 has a sharp cross-shaped notch in the axial direction. This is to increase the contact area between the base resin and the curing agent at the beginning of mixing. Therefore, if this purpose is to be achieved, the tip 16a of the tube 16 is not limited to the illustrated cross shape.

A conduit pipe 17 serving as a conduit is screwed onto the mixer block 11 and connected to the downstream side of the passage 15 through which the curing agent flows. The conduit pipe 17 has a pipe line having the same inner diameter as the inner diameter of the downstream side of the passage 15, but has an enlarged diameter in a part of the side connected to the static mixer pipe (not shown) on the downstream side. It has a bulge 18. This bulge 18 serves to bring the flowing base material and curing agent into a kind of preliminary mixing state before entering the static mixer tube 7 shown in FIG.

Next, the operation of the two-liquid mixing device having the above configuration will be described.

The base agent flowing through the passage 14 and the curing agent flowing through the passage 15 come into contact and merge at a predetermined mixing ratio at both lower end portions without causing any turbulence or stagnation, and then flow into the conduit tube 17. Mix while flowing. Furthermore, when the two liquids that have merged flow through the bulge 18 of the conduit pipe 17, they are mixed even better and flow into the static mixer pipe 7 shown in FIG. The mixture is thoroughly mixed while flowing through the spray gun.

In the above embodiment, the passage 14 through which the main agent flows and the passage 15 through which the curing agent flows partly take the form of a so-called double pipe; It may take some form.

(Effects of the Invention) As explained above, according to the present invention, the main agent and curing agent flowing from separate passages are brought into contact with each other in the same flow direction, and further, the main agent and curing agent are preliminarily introduced in the conduit passage leading to the static mixer pipe. By mixing, it is possible to mix well so that the mixing ratio of the base resin and curing agent does not change from the normal ratio, so it is possible to mix the base resin and curing agent at a ratio different from the normal ratio. It can be prevented. Therefore, according to the present invention, it is possible to eliminate the work to remove the lumps that remained and accumulated in the device, which was performed periodically in the conventional two-liquid mixing device, and therefore continuous operation is possible. At the same time, the work required to hold the device can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an example of a conventional two-liquid mixing device, FIG. 2 is a partially cutaway front view showing an example of the two-liquid mixing device of the present invention, and FIG. Figure 4 is a cross-sectional view along the line of Figure 2.
It is a sectional view along a line. 7... Static mixer pipe, 11... Mixer block, 14... Passage through which the base agent flows, 15... Passage through which the curing agent flows, 17... Conduit pipe (conducting path).

Claims (1)

[Claims] 1 Separate passages are provided for the base resin and curing agent to flow, and the passage for the base resin is disposed coaxially inside the passage for the curing agent at least on the downstream side, and the downstream ends of both passages are provided separately. is communicated with the static mixer pipe via a conductive passage, and in a portion where the passages through which the base agent and curing agent separately flow overlap, the portion of the passage through which the base agent flows relative to the cross-sectional area of the passage through which the base agent flows. A two-component mixing device, characterized in that the proportion of the cross-sectional area of the passage through which the curing agent flows, excluding the curing agent, is approximately the same as the mixing ratio of the main agent and the curing agent, and further, the diameter of a part of the conducting passage is enlarged.