JPH02276609A - Multi-component synthetic resin mixing device - Google Patents

Abstract

PURPOSE:To improve the mixing efficiency of resins by leaps and bounds by a structure wherein first cleaning members, each of which reciprocates between its retreat position to open influx holes and its advance position at the tip of a bung hole, are fittingly inserted in respective primary mixing chambers and a second cleaning member, which reciprocates between its retreat position to partially open the bung holes and its advance position at the tip of a discharge hole, is fittingly inserted in a secondary mixing chamber. CONSTITUTION:In each primary mixing chamber 10, influx holes 11 and 12 for respective resin components to be mixed with each other are provided at positions to be opposite to each other. Respective resin components are jetted through respective nozzles 13 and 14 so as to collide against each other in order to mix with each other through counterflow. Each first cleaning piston 20 is moved between the retreat position, at which respective influx holes 11 and 12 are opened for mixing, and the advance position, at which the mixture of the respective resin components is poured out of a bung hole 31 into a secondary mixing chamber 30. A second cleaning piston 35 in the secondary mixing chamber 30 is moved between the retreat position, at which the bung hole 31 is opened so as to flow primary mixture of the resin components in the secondary mixing chamber 30, and the advance position, at which the final mixture is discharged from a discharge hole outside the secondary mixing chamber. The primary mixture of the resin components is given throttling effect by the bung hole 31 so as to be jetted in the secondary mixing chamber 30.

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 type of mixing device controls the inflow and outflow of each resin component into the mixing chamber, and controls the inflow and outflow of each resin component into the mixing chamber. A piston for feeding the mixed resin into the mold is inserted into the piston, and the mixed resin is intermittently fed into the mold by the reciprocating motion of the piston. There is a known structure in which each resin component is conducted to its outlet through a return groove and circulated to each resin component tank (see Japanese Patent Application Laid-Open No. 1536/1984).
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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-described apparatus, the piston is required to have sealing performance so that the resin components do not interfere with each other during circulation of the resin components 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 problems in terms of design technology and cost, but even if these problems are solved, piston seizure may occur. A new problem arose regarding the maintenance and durability of the mixing device known as the gall, and a drastic solution was needed.

(Problems to be Solved by the Invention) Therefore, this invention was proposed in view of the above situation, and it dramatically improves the 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 novel 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 a self-flow manner, A plurality of primary mixing chambers each having an inlet for each resin component and a spout for the first mixed resin component are provided, and each of the primary mixing chambers includes a retreat position for opening the inlet and a spout for the first mixed resin component. A first cleaning member that reciprocates between a forward position of the outlet tip and a second cleaning member is fitted therein, and a second cleaning member that communicates with each of the spout ports and has a common discharge port for the second mixed resin component. A secondary mixing chamber is provided, and within the secondary mixing chamber,
The present invention relates to a multi-component synthetic resin mixing device characterized in that a second cleaning member is inserted therein 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.

(Example) The present invention will now be described in detail with reference to the accompanying drawings.

The attached 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 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, and FIG.
A cross-sectional view showing the mixing device shown in the figure when the mixing is stopped;
Fig. 6 is a cross-sectional view showing the mixed state, and Fig. 7 is a cross-sectional view showing the mixed state.
FIG. 3 is a cross-sectional view of the mixing device shown in the figure during simultaneous operation;

As shown in the general view of FIG. 1, the mixing device according to the present invention includes a first mixing chamber 10 and a first cleaning piston 20 that reciprocates within the mixing chamber 10. A secondary mixing chamber 30 is provided with a plurality of M and communicates with each of the primary mixing chambers 10 through respective spouts 31.
and a second mixing section N constituted by a second cleaning piston 35 that reciprocates within the mixing chamber 30.

Although FIG. 1 shows an example in which the two second-situation joints M and M are provided at positions facing each other, the arrangement of the @-next-situation parts M and M is free in design. It is left to the.

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

In other words, the primary mixing chamber 10 constituting the first-stage joint M
As can be better understood in the cross-sectional view of FIG. Each resin component is injected into the mixing chamber 10 by the nozzles 13, 14, collides with each other, and is configured to mix countercurrently.

The primary mixing chamber IO is further provided with an outlet 15.16 for each resin component, which outlet 15.
16 are in communication with respective resin component tanks (not shown) through respective return pipes 17,18.

Further, this primary mixing chamber IO communicates with a secondary mixing chamber 30 through an outlet 31.

A first cleaning piston 20 that reciprocates within the mixing chamber 10 by a hydraulic cylinder device 25 is inserted into the primary mixing chamber 1O, and opens the inlets 11 and 12 for each resin component. and a forward position where the primary mixed resin components are poured out from the spout 31 into the secondary mixing chamber 30.

Reference numerals 26 and 27 in FIG. 1 indicate hydraulic oil inlets and outlets in the cylinder device 25.

As can be clearly understood from FIGS. 5 and 6, the first cleaning piston 20 is provided with return grooves 21 and 22 provided as notches in a part of its axial direction, and when the mixing is stopped (the In Fig. 5), each resin component A, B flowing in from the inlet 11.12 is passed through each return groove 21.22,
It is constructed so that it can be guided to outlet ports 15 and 16 and circulated to each resin component tank. It should be noted that the first cleaning piston 20 at the time of stopping the mixing is also the position where the primary mixed resin component in the primary mixing chamber IO is simultaneously fed into the secondary mixing chamber 30 through the spout 31. Not even.

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

Next, the second mixing section N will be described. The secondary mixing chamber 30 has respective pouring ports 31 and 31 which are openings that communicate with each of the above-mentioned primary mixing chambers 10.

A discharge port 33 is provided which is an opening to the mold via a mixing passage 32.

As shown in FIG. 1, a second cleaning piston 35 is inserted into the secondary mixing chamber 30 and reciprocates within the mixing chamber 30 by a hydraulic cylinder device 40, and opens the spout 31. and a retreat position where the primary mixed resin component flows into the secondary mixing chamber 30 from the primary mixing chamber lO, and a retreat position where the primary mixed resin component flows from the discharge port to the outside of the secondary mixing chamber (i.e. molding). It is configured to move between a forward position and a forward position where it is discharged into a mold.

Reference numerals 42 and 43 in FIG. 1 indicate the hydraulic cylinder device 4.
This is the hydraulic oil outflow inlet in No. 1.

In addition, as shown in FIG. 1, the second cleaning piston 35
The opening position of the spout 31 can be regulated and controlled by a stopper 41 provided on the piston rod. Set the opening position of the spout 31 to tAf! By partially opening the first mixed resin component, the first mixed resin component can be spouted into the second mixing chamber 30 with a constriction effect. 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.

Furthermore, in the illustrated embodiment, as another means for increasing the mixing efficiency, the secondary mixing chamber 30 is configured to have a rectangular cylindrical shape with a rectangular cross section, and a spout 3 is provided at the corner of the cylindrical shape.
An example in which 1 is provided 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 creates a turbulent flow. effect is imparted, stirring is enhanced, and mixing efficiency is further improved.

Note that a cylindrical secondary mixing chamber 30 as shown in FIG.
The same effect can be obtained as well.

Furthermore, f! As shown in Figure 47 (, two spouts 3
1.31 are arranged in opposing positions to each other in the secondary mixing chamber 30, and the primary mixed resin components flowing into the secondary mixing chamber 30 from each primary mixing chamber 10°10 collide with each other. Countercurrent mixing further enhances the mixing and agitation of the secondary mixing components.

In the present invention, the resin components mixed in the plurality of first-stage joints M may be the same or different types.

The plurality of first-state joints M may be operated at the same time, or may be selectively operated.

When operating simultaneously, it is possible to mix a large amount or a wide variety of materials. When used selectively, 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. It becomes possible to supply

(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. A turbulent flow effect is imparted to the mixed resin, stirring progresses, and mixing efficiency is dramatically improved.

Second, in relation to the above, the main problem in conventional equipment is the disturbance in the initial flow velocity of each resin component at the start of mixing.
Since the mixing chamber has two stages and the flow changes, it will dissolve while being stirred from the first mixing chamber through the spout and into the second mixing chamber. There will be no effect 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 prevented 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 its durability is improved.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a polyurethane resin mixing device showing an embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view of the main parts thereof,
FIG. 3 is an enlarged cross-sectional view of the main part, FIG. 4 is a cross-sectional view of the main part showing another embodiment, and FIG. 5 is a cross-sectional view of the mixing device shown in FIG. 1 when the mixing is stopped. FIG. 6 is a cross-sectional view showing the mixing state, and FIG. 7 is a cross-sectional view of the mixing device shown in FIG. 4 during simultaneous operation. M... 1st situation joint, lO... primary mixing chamber, 11
゜12... Inflow port, 20... First cleaning piston, 25... Hydraulic cylinder device, N... Secondary mixing section, 30... Primary mixing chamber, 31... Note Exit, 3
2... Mixing passage, 33... Discharge port, 35... Second cleaning piston, 40... Hydraulic cylinder device,
A, B...Resin components. Diagram

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 the resin components in countercurrent, 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 retracted position for opening the inlet and an advanced position for the tip of the spout. A first cleaning member that reciprocates between the chambers is fitted therein, and a secondary mixing chamber is provided which communicates with each of the spout ports and has a common discharge port for the second mixed resin component. hand,
A second cleaning member is fitted in the second mixing chamber and reciprocates between a retracted position where the spout is partially opened and an advanced position where the tip of the spout is moved forward. Component synthetic resin mixing device. 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.