JPH02107322A - Mixing head - Google Patents

Abstract

PURPOSE:To hold constant the pressure on the entrance side of materials at the time of the feed and circulation thereof by communicating feed valves, pressure adjusting valves and discharge openings with one another through a rod groove for a mixing chamber at the time of the material circulation and making the passage resistance against the materials smaller than that at the time when the pressure adjusting valves are not communicated with the others. CONSTITUTION:A groove 16a is formed by the side of a mixing rod 16 reciprocally movable in a mixing chamber 14 for mixing a plurality of materials. There are provided feed valves 20 open to the mixing chamber 14 for feeding the materials thereinto, pressure adjusting valves 24 open thereto in communication with the feed valves 20 and discharge openings 26 open thereto for discharging the material from the mixing chamber 14. When the valves 20 and the mixing chamber 14 are in communication, the valve 20 and 24 and the discharge openings 26 are cut off from the communication with one another by the mixing rod 16. When the valves 20 and the mixing chamber 14 are cut off from the communication with one another by the rod 16, the valves 20 and 24 and the discharge openings 26 are communicated with one another through the groove 16a. In this way the pressure on the entrance side of the material can be held constant at the time of feeding and circulating the materials in the mixing chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a mixing head, in particular for mixing isocyanate compounds and polyols, for example to obtain urethane foams.

(Prior Art) FIGS. 5A and 5B are illustrative views showing an example of a conventional mixing head that is the background of the present invention.

This mixing head 1 includes a mixing chamber 2 . Furthermore, the mixing head 1 includes a rod 3 that reciprocates within the mixing chamber 2 . A groove 3a is formed on the side surface of this rod 3.

Furthermore, the mixing head 1 opens towards the mixing chamber 2,
It includes two injection valves 4 for injecting materials into the mixing chamber 2. These injection valves 4 are connected to a material inlet 5 . Moreover, these material masses 5 are connected to the discharge port 6 via the groove 3a in a state in which the rod 3 is pushed out.

In this mixing head 1, as shown in FIG. 5A, the material port 5 and the discharge port 6 communicate with each other with the rod 3 pushed out, so that the material entering from the material port 5 is transferred to the groove 3.
a and discharged from the mixing head 1 through the outlet 6;
Returned to an external material tank (not shown). In other words, during this time the material is being circulated between the material tank and the mixing head 1.

Further, as shown in FIG. 5B, when the rod 3 is pulled back, the material is injected into the mixing chamber 2 through the injection valve 4, and the material is injected into the mixing chamber 2.
The two materials are mixed within. The mixed materials are then discharged to the outside of the mixing head 1 through the discharge chamber 7. Thereafter, the rod 3 is pushed out and the inside of the mixing chamber 2 is cleaned.

(Problems to be Solved by the Invention) However, in such a conventional mixing head, the pressure on the material inlet side during material circulation is higher than the material inlet side pressure during material injection. This is because when material is injected, only the pressure set by the injection valve is applied, but when the material is circulated, not only the set pressure of the injection valve but also the resistance of the groove of the rod and the pipe line at the discharge port are applied. It is.

Therefore, the main objective of the invention is to provide a mixing head that is capable of keeping the material inlet pressure constant both when the material is injected into the mixing chamber and during circulation.

(Means for Solving the Problems) The present invention includes a mixing chamber for mixing a plurality of materials, a mixing chamber rod that reciprocates within the mixing chamber and has a groove formed on its side surface, and a rod that moves toward the mixing chamber. an injection valve that opens toward the mixing chamber and injects the material into the mixing chamber; a pressure regulating valve that communicates with the injection valve and opens toward the mixing chamber; and a pressure regulating valve that opens toward the mixing chamber and guides the material out of the mixing chamber. including an outlet for the
When the injection valve and the mixing chamber are in communication, the injection valve, the pressure regulating valve, and the discharge port are blocked by the mixing chamber rod, and when the injection valve and the mixing chamber are blocked by the mixing chamber rod, A mixing head in which an injection valve, a pressure regulating valve and an outlet are communicated by the groove of the mixing chamber rod.

(Function) During material circulation, the injection valve, pressure regulating valve, and discharge port are communicated with each other by the groove of the mixing chamber rod. When the injection valve, the pressure regulation valve, and the discharge port are in communication with each other, the resistance of the passage against the material becomes smaller than when the pressure regulation valve is not formed, and the pressure on the material inlet side of the injection valve becomes smaller.

(Effects of the Invention) According to the present invention, the material inlet side pressure during material circulation can be made smaller than in the case where no pressure regulating valve is formed. Therefore, the pressure on the material inlet side of the mixing head can be kept constant at - both when the material is injected into the mixing chamber and when the material is circulated.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Embodiment) FIG. 1 is an illustration showing a state in which a mixing head according to an embodiment of the present invention is viewed from above, and FIG. 2 is an illustration showing a state in which the mixing head shown in FIG. 1 is seen from the side. It is a diagram. Such a mixing head is used, for example, to mix an isocyanate compound and a polyol to obtain a urethane foam.

In this case, for example, the isocyanate compound is mixed in a weight ratio of 50±1 to 100 parts of the polyol.

The mixing head 10 includes a case 12 . A mixing chamber 14 for mixing materials in the lateral direction of the case 12 is formed within the case 12 . A mixing chamber rod 16 is inserted into the mixing chamber 14 . Two grooves 16a are formed on the side surface of this mixing chamber rod 1G, and when this mixing chamber rod 16 reciprocates within the mixing chamber 14, one end of the mixing chamber rod 16 is formed with two grooves 16a. A mixing chamber hydraulic cylinder 18 is attached to drive the mixing chamber.

Furthermore, the mixing head 10 includes two injection valves 20 that open into the mixing chamber 14 . A material port 22 is communicated with the injection valve 20 , and the material entering from the material port 22 is injected into the mixing chamber 14 through the injection valve 20 .

Furthermore, an injection valve 20 opens toward the mixing chamber 14 and
Two pressure regulating valves 24 are formed so as to communicate with.

Furthermore, two discharge ports 26 are formed which open toward the mixing chamber 14 and are spaced apart from the pressure regulating valve 24 .

Further, the mixing head 10 includes a discharge chamber 28 formed perpendicularly to the mixing chamber 14 . A discharge rod 30 is inserted into the discharge chamber 28, and this discharge rod 30 is inserted into the discharge chamber 28.
Reciprocate within 8. A discharge hydraulic cylinder 32 for driving the discharge rod 30 is attached to one end of the discharge rod 30.

In this mixing head 10, materials are fed into a material filling 22 from a material tank (not shown) by a pump or the like. Then, as shown in FIG. 3, the mixing chamber rod 1
6 is pushed out, the injection valve 20. The pressure regulating valve 24 and the discharge port 26 are communicated within the mixing chamber 14 through the groove 16a of the mixing chamber rod 16. In this case, the fed material is guided from both the injection valve 20 and the pressure regulating valve 24 to the groove 16a of the mixing chamber rod 16, and further to the discharge port 26. In this case, a material population of 22
If the material is fed at a pressure of, for example, 150 kg/cd, the injection valve 20 is fed with a pressure of, for example, 120 kg/cd.
AJ pressure is applied, and 30kg/a is applied to the pressure regulating valve 24.
A pressure of j is applied. In this way, if the sent material is divided into the injection valve 20 and the pressure regulating valve 24, the injection valve 2
The resistance of the passage to the material is lower than that in the case where the material is led to the outlet 26 through only the material. Therefore, the influence of the resistance of the passage on the material is small, the pressure on the material population 22 side is 150 kg/cj, and no excessive pressure is applied.

Further, as shown in FIG. 4, when the mixing chamber rod 16 is in the retracted position, the injection valve 20 opens toward the mixing chamber 14, and the pressure regulating valve 24 and the outlet 26 are respectively connected to the mixing chamber. It is blocked by rod 16. Thus, the material enters the mixing chamber 14 from the injection valve 20, e.g.
Injected at a pressure of 50 kg/cj. The materials injected into the mixing chamber 14 are mixed, and the mixed materials are fed into the discharge chamber 2nd day. After the materials are mixed in the mixing chamber 14,
The mixing chamber rod 16 is pushed out, and the inside of the mixing chamber 14 is cleaned. At this time, the mixing chamber rod 16 is in the position shown in FIG. 3, so that the material circulates between the mixing head 10 and the material tank.

The material fed into the discharge chamber 28 is discharged outside the mixing head 10. When the mixed materials are discharged outside the mixing head 10, the discharge rod 30 is pushed out and the discharge chamber 2
8 will be cleaned.

Thus, with this mixing head 10, both when injecting the material into the mixing chamber 14 and when circulating the material.
The pressure of the material entering the mixing head 10 can be kept constant and excessive pressure can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an illustrative view showing a mixing head according to an embodiment of the present invention viewed from above. FIG. 2 is an illustrative view showing the mixing head shown in FIG. 1 viewed from the side. 3 and 4 are illustrative views showing the movement of the mixing head shown in FIG. 1. FIG. FIGS. 5A and 5B are illustrative views showing an example of a conventional mixing head that is the background of the present invention. In the figure, 10 is a mixing head, 14 is a mixing chamber, 16 is a mixing chamber rod, 16a is a groove in the mixing chamber rod, 20 is an injection valve, 24 is a pressure regulating valve, and 26 is a discharge port. Patent applicant Toho Kikai Kogyo Co., Ltd. Agent Patent attorney Oka 1) Zen Kei Figure 1゜

Claims (1)

[Scope of Claims] A mixing chamber for mixing a plurality of materials, a rod for the mixing chamber that reciprocates within the mixing chamber and has a groove formed on its side surface, a rod that opens toward the mixing chamber and that mixes the materials. an injection valve for injecting into the mixing chamber; a pressure regulating valve communicating with the injection valve and opening toward the mixing chamber; and an opening toward the mixing chamber for guiding the material out of the mixing chamber. and a discharge port, and when the injection valve and the mixing chamber are in communication, the injection valve, the pressure regulating valve, and the discharge port are blocked by the mixing chamber rod, and the injection valve and the mixing chamber are in communication with each other. When the chamber is blocked by the mixing chamber rod, the injection valve, the pressure regulating valve, and the outlet are communicated with each other by the groove of the mixing chamber rod.