JPH0313049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for mixing two or more chemically reactive resin components, in particular a mixing device for polyurethane resins.

(Prior art) Conventionally, for example, when molding polyurethane resin, liquid raw materials of a plurality of chemically reacting resin components are injected into a mixing chamber from opposing inlets, the components are mixed in countercurrent, and then ejected from the discharge port. Mixing devices for injection into molds are known. This kind of mixing device is
For example, in a mixing chamber that has an inlet and an outlet for each resin component and one common discharge port to the mold, the flow of each resin component into and out of the mixing chamber is controlled, and the mixed resin in the mixing chamber is transferred to the mold. A piston to be fed is inserted into the mold, and the mixed resin component is intermittently fed into the mold by the reciprocating movement of the piston, and when mixing is stopped, a return groove provided in the axial direction of the piston is inserted. A system is known in which each resin component is circulated through its outlet and circulated to each resin component tank (see Japanese Patent Laid-Open No. 1536/1984).

By the way, in actual mixing, a certain distance (mixing passage) is required from the mixing chamber to the discharge port in order to increase the mixing efficiency.

In addition, in order to adjust the initial flow velocity of each resin component particularly at the start of mixing, there is a requirement that the piston that opens and closes the inlet must be switched at high speed. However, when the piston speed is increased, the flow rate of the mixed liquid into the mold increases, which may cause air bubbles to be trapped in the mold, resulting in poor molding.

Furthermore, in the above-mentioned apparatus, the piston is required to have sealing performance so that each resin component does not interfere with each other during circulation of each resin component when mixing is stopped.
There is a demand to improve piston accuracy.

However, at present, the reality is that pistons with high precision and long strokes are operated at high speeds as the greatest common denominator that satisfies the above requirements. However, operating a piston with such high precision and a long stroke at high speeds not only poses design technology and cost problems, but even if these problems are solved, piston seizure, A new problem arose regarding the maintenance and durability of the mixing device known as a galley, and a drastic solution was needed.

(Problems to be Solved by the Invention) Therefore, the present invention has been proposed in view of the above situation, and is intended to dramatically improve mixing efficiency, including the problem of uneven initial flow velocity at the start of mixing. The object of the present invention is to provide a new mixing device that improves the performance of the invention.

Another object of the present invention is to provide a novel mixing device that can be used simultaneously or selectively for the same or different components, and is capable of mixing a large capacity and a large number of types.

(Means for Solving the Problems) That is, the present invention is an apparatus that injects two or more types of chemically reactive resin components into a mixing chamber from opposing inlets to mix each resin component in countercurrent. , a plurality of primary mixing chambers each having an inlet for each resin component and an outlet for the primary mixed resin component, each of the primary mixing chambers having a retracted position for opening the inlet and a retracted position for opening the inlet; A first cleaning member that reciprocates between the advanced position of the tip of the spout and a first cleaning member that communicates with each spout and has a common discharge port for the second mixed resin component is fitted therein. A secondary mixing chamber is provided, and a second cleaning member is fitted within the secondary mixing chamber to reciprocate between a retracted position for partially opening the spout and an advanced position for the tip of the spout. The present invention relates to a multi-component synthetic resin mixing device characterized by being inserted into the device.

(Example) The details of this invention will be explained below with reference to the attached drawings.

The attached drawings Fig. 1 is a longitudinal cross-sectional view of a polyurethane resin mixing device showing one embodiment of the present invention, Fig. 2 is an enlarged longitudinal cross-sectional view of the main parts thereof, and Fig. 3 is an enlarged cross-sectional view of the main parts thereof. , FIG. 4 is a cross-sectional view of the main part showing another embodiment, FIG. 5 is a cross-sectional view showing the mixing device shown in FIG. 1 in a mixing stopped state, and FIG. 6 is a cross-sectional view showing the same mixing state. 7 is a cross-sectional view of the mixing device shown in FIG. 4 during simultaneous operation; FIG.

As shown in the general view of FIG. 1, the mixing device according to the present invention includes a primary mixing chamber 10 and a mixing chamber 1
The first cleaning piston 20 reciprocates within 0
A plurality of primary mixing sections M are provided,
Each of the primary mixing chambers 10 and each spout 31
The mixing chamber 3 of the secondary mixing chamber 30 communicates with
A second cleaning piston 35 that reciprocates within 0
It includes a secondary mixing section N constituted by.

Although FIG. 1 shows an example in which two primary mixing sections M, M are provided at positions facing each other, there is freedom in design regarding the arrangement of the primary mixing sections M, M. It is left to the.

First, the primary mixing section M will be explained. Each primary mixing section M in this invention has a mutually common basic configuration.

That is, the primary mixing chamber 10 constituting the primary mixing section M is arranged so that each resin component is mixed in opposing positions of the mixing chamber 10, as can be better understood in the cross-sectional view of FIG. Inlet 1 for A, B
1 and 12 are provided, and each resin component is injected into the mixing chamber 10 by the respective nozzles 13 and 14, and is configured to collide and mix in a countercurrent manner.

The primary mixing chamber 10 is further provided with an outlet 15, 16 for each resin component, which is connected to each resin component tank (not shown) through a respective return pipe 17, 18. ).

Further, this primary mixing chamber 10 communicates with a secondary mixing chamber 30 through a spout 31 .

A first cleaning piston 20 is inserted into the primary mixing chamber 10 and reciprocated within the mixing chamber 10 by a hydraulic cylinder device 25, and the inlets 11, 12 of each resin component are It moves between a retracted position in which it is opened and mixed, and a forward position in which the primary mixed resin component is poured out from the spout 31 into the secondary mixing chamber 30.

Reference numerals 26 and 27 in FIG. 1 indicate the cylinder device 25.
The figure shows the inlet and outlet of hydraulic oil.

As can be well understood from FIGS. 5 and 6, the first cleaning piston 20 includes a return groove 21 provided as a notch in a part of the axial direction.
22, and when the mixing is stopped (Fig. 5), each resin component A, B flows in through the inflow ports 11, 12.
through the respective return grooves 21 and 22, and the outlet 15,
16, and is configured so that it can be circulated and fed to each resin component tank. Note that the first cleaning piston 20 when the mixing is stopped simultaneously drains the first mixed resin component in the first mixing chamber 10 into the spout 3.
Needless to say, this is also the position where the mixture is fed from No. 1 to the secondary mixing chamber 30.

FIG. 6 shows the retracted position of the piston 20 during mixing.

Next, to explain the secondary mixing section N, the secondary mixing chamber 30 includes each of the above-mentioned primary mixing chambers 10.
Each spout 31, 31 is an opening communicating with the
A discharge port 33 is provided which is an opening to the mold via a mixing passage 32.

Then, as shown in FIG. 1, the secondary mixing chamber 30 is provided with
A second cleaning piston 35 that reciprocates inside is fitted and inserted, and opens the spout 31 to flow the primary mixed resin component from the primary mixing chamber 10 into the secondary mixing chamber 30. and a forward position where the secondary mixed resin component is discharged from the discharge port to the outside of the secondary mixing chamber (that is, to the mold).

Reference numerals 42 and 43 in FIG. 1 are inlets for hydraulic oil in the hydraulic cylinder device 41. As shown in FIG.

In addition, as shown in FIG. 1, a stopper 41 provided on the piston rod of the second cleaning piston 35
It is possible to regulate and control the opening position of the spout 31. By adjusting the opening position of the spout 31 so as to partially open it, it is possible to impart a throttling effect to the primary mixed resin component and cause it to be spouted into the secondary mixing chamber 30 . The resin component spouted into the secondary mixing chamber 30 from the spout 31 is further given a turbulent flow effect by the throttling effect, thereby increasing the mixing efficiency.

Additionally, in the illustrated embodiment, a secondary mixing chamber 3 is provided as another means for increasing mixing efficiency.
0 is constructed in the shape of a prismatic tube with a rectangular cross section, and an example in which a spout 31 is provided at a corner of the prismatic tube shape is illustrated. By configuring the secondary mixing chamber 30 in this way, the primary mixed resin poured out from the primary mixing chamber 10 is given a squeezing effect, and
The inner wall of the secondary mixing chamber 30 provides a turbulent flow effect to enhance agitation and further improve mixing efficiency.

Note that the same effect can be obtained by using a cylindrical secondary mixing chamber 30 as shown in FIG. 4.

Furthermore, as illustrated in FIG.
If the primary mixed resin components flowing into the secondary mixing chamber 30 from 10 collide with each other and mix countercurrently,
The mixing agitation of the secondary mixing components is further increased.

In this invention, the resin components mixed in the plurality of primary mixing sections M may be the same or different types.

The plurality of primary mixing sections M may be operated simultaneously or may be selectively operated. When operated simultaneously, large volumes or mixing of various types are possible. When selectively used, it is possible to instantly switch and supply different types of mixed components to a single mold, or to continuously supply the same type of components.

(Effects) This invention having the above configuration provides the following advantages.

First, the primary mixed resin components that have been mixed countercurrently in the primary mixing chamber are poured into the secondary mixing chamber through the spout, and due to the change in the flow direction of the mixed resin that occurs at this time. As a result, a turbulent flow effect is imparted to the mixed resin, stirring progresses, and the mixing efficiency is dramatically improved.

Second, in relation to the above, the main problem with conventional equipment is the disturbance in the initial flow velocity of each resin component at the start of mixing, which results in a two-stage mixing chamber and changes in the flow. Then, it flows from the primary mixing chamber through the spout into the secondary mixing chamber and is dissolved while being stirred, and there is no effect on the molded product at all.

Thirdly, according to the device of the present invention, as described above, it is possible to simultaneously or selectively use the same or different components, and it is possible to mix a large amount and a large number of types.

In addition, according to the present invention, since the second cleaning piston that feeds the mixed resin into the mold can be moved at a low speed, there is an advantage in molding that air bubbles can be avoided from being drawn into the mold. Further, the second cleaning piston does not require high sealing precision as in the conventional piston, and has great advantages in that it is easy to manufacture and maintain, and has improved durability.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a polyurethane resin mixing device showing an embodiment of the present invention, FIG. 2 is an enlarged longitudinal cross-sectional view of its main parts, FIG. 3 is an enlarged cross-sectional view of its main parts, The figure is a cross-sectional view of the main part showing another embodiment, FIG. 5 is a cross-sectional view showing the mixing device shown in FIG. 1 in a mixing stopped state, and FIG. 6 is a cross-sectional view showing the same mixing state. FIG. 7 is a cross-sectional view of the mixing device shown in FIG. 4 during simultaneous operation. M...Primary mixing section, 10...Primary mixing chamber, 1
DESCRIPTION OF SYMBOLS 1, 12... Inflow port, 20... First cleaning piston, 25... Hydraulic cylinder device, N... Secondary mixing part, 30... Secondary mixing chamber, 31... Outlet, 32...
Mixing passage, 33...Discharge port, 35...Second cleaning piston, 40...Hydraulic cylinder device, A, B...
Resin component.

Claims (1)

[Scope of Claims] 1. A device for injecting two or more chemically reactive resin components into a mixing chamber from opposing inlets to mix each resin component countercurrently, the device comprising: an inlet for each resin component; A plurality of primary mixing chambers each having a spout for the primary mixed resin component are provided, and each of the primary mixing chambers has a space between a retracted position where the inlet is opened and a forward position of the tip of the spout. A first cleaning member that reciprocates is fitted into each of the first cleaning members, and a second mixing chamber is provided, which communicates with each of the spouts and has a common discharge port for the second mixed resin component. A second cleaning member is fitted in the second mixing chamber and reciprocates between a retracted position where the spout is partially opened and a forward position where the tip of the spout is moved forward. Multi-component synthetic resin mixing equipment. 2. The multi-component synthetic resin mixing device according to claim 1, wherein the spouts are provided at positions facing each other in the secondary mixing chamber.