JPH07115351B2 - Multi-component synthetic resin mixing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-component synthetic resin mixing apparatus for mixing chemically reacting resin components such as polyurethane resin and injecting them into a molding die.

(Prior Art) For example, in molding processing of a polyurethane resin, a mixing device is used in which a plurality of resin components that react with each other are injected into a mixing chamber, mixed and stirred, and discharged into a predetermined mold. However, in recent years, in this type of mixing device, in order to enhance the mixing and stirring effect of the mixed components and to obtain a smooth flow of the resin component to be discharged, a throttle portion or a bent portion is provided in the mixing chamber or the component discharge passage. Is being done.

For example, Japanese Patent Application Laid-Open No. 58-167145 discloses a mixing head in which a plurality of damming members are arranged in a mixing chamber so as to be freely movable in and out. Further, in Japanese Patent Publication No. 57-30062, a throttle slider provided with a hole forming a part of the mixing chamber is reciprocally arranged in the mixing chamber, and a resin flowing down the mixing chamber depending on the position of the hole. Disclosed is one in which the flow paths of the components are bent and changed to increase the mixing efficiency.

Among these prior arts, the former is excellent in the so-called throttling effect of narrowing the flow path of the resin component flowing down the mixing chamber, but has a problem that a smooth flow of the resin component in the discharge part cannot be obtained. There is. Further, in the latter case, there is a problem that the change of the flow of the resin component is largely influenced by the size of the mixing chamber and it is difficult to obtain a sufficient effect.

Further, in the conventional apparatus, there is almost no effective structure for eliminating defective stirring due to the disturbance of the initial flow of each resin component at the start of mixing.

(Problems to be Solved by the Invention) The present invention has been proposed in view of the above-mentioned problems, and its main purpose is to enhance the mixing and stirring effect of the mixed components and to smoothly discharge the resin components. It is to provide a mixing device having a novel structure capable of obtaining a flow. In particular, the present invention proposes a mixing device having an effective structure for eliminating defective stirring due to the disturbance of the initial flow of each resin component at the start of mixing.

(Means for Solving Problems) That is, the present invention provides a mixing device configured such that a cleaning member reciprocates in a mixing chamber having an inlet for each resin component and an outlet for mixing components. An extruding member is formed between the inflow port and the discharge port, the transmutation chamber opening to the mixing chamber is formed orthogonally, the chamber volume is changed in the chamber, and the resin component in the chamber is extruded into the mixing chamber. The resin component is reciprocally inserted and protrudes into the mixing chamber at a position facing the current changing chamber to form a predetermined throttle gap, and a resin component flowing down in the mixing chamber is introduced into the current changing chamber. The present invention relates to a multi-component synthetic resin mixing device in which a baffle member to be introduced is moved forward and backward.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall vertical sectional view showing a multi-component synthetic resin mixing apparatus according to an embodiment of the present invention, and FIG. FIG. 3 is a longitudinal sectional view showing a mixing stopped state, FIG. 4 is a transverse sectional view showing a mixed state, and FIG. 5 is a transverse sectional view showing a mixing stopped state. FIG. 7 is a longitudinal sectional view of the switching valve mechanism of the embodiment apparatus during mixing, and FIG. 7 is a longitudinal sectional view of the same when mixing is stopped.
FIG. 8 is a vertical cross-sectional view of the same when waiting for the start of mixing.

The multi-component synthetic resin mixing device 10 shown in the embodiment of FIG. 1 is a mixing device for polyurethane resin, and has a mixing chamber having inlets 21 and 22 for each resin component and a discharge port 31 for the mixed component. A cleaning rod 35 is reciprocally provided inside the unit 20. In FIG. 1, reference numerals
Reference numeral 11 is a main body block, 12 is a cylinder portion of the cleaning rod 35, 13 is a piston of the cleaning rod, and 14 and 15 are inflow / outflow ports of hydraulic oil. Further, FIG. 6 shows a vertical cross-sectional view of the periphery of the mixing chamber 20 in which the cutting position is different by 90 degrees in this device 10, and in FIG. 6, the reference numeral 23 indicates the inlets 21 and 22 of the resin components. Nozzle mounted on the, 24 is also a switching valve for resin components, 25 is a component supply conduit from each resin component tank, 26 is a return conduit to each component tank T, 28 is a drive cylinder device of the switching valve 24. .

As shown in FIG. 1, the characteristic feature of the device of the present invention is that a current-changing chamber 40 opening to the mixing chamber 20 is formed between the inflow ports 21 and 22 and the discharge port 31, and an extruding member is placed in the current-flow chamber. The baffle member 50 is installed so as to be reciprocally movable, and the baffle member 50 can be moved forward and backward at a position opposed to the current transformation chamber.

That is, as is better understood from the enlarged cross-sectional views of FIGS. 2 and 4, the current transformation chamber 40 is located at a position close to the inlets 21 and 22 of the resin components and is substantially orthogonal to the mixing chamber 20. It is formed. The current-changing chamber 40 has a cylindrical shape in the illustrated embodiment, but various shapes can be selected as required.

An extruding member 41 that changes the volume of the current-changing chamber 40 and pushes the resin component in the chamber 40 into the mixing chamber 20 is reciprocally fitted into the current-changing chamber 40. That is, as shown in FIG.
41 is connected to a piston rod 46 of a cylinder device 45 provided on the rear side thereof, and is configured to be reciprocated by the driving of the cylinder device 45. Reference number 47,48
Is an inflow / outflow inlet of the driving fluid of the cylinder device 45. In addition,
It goes without saying that the forward and backward positions of the pushing member 41 can be adjusted freely.

When the mixing is stopped, the extruding member 41 pushes out the resin component in the current-changing chamber 40 into the mixing chamber 20 as shown in FIG. 5, and at the inner wall of the mixing chamber 20 so as not to hinder the passage of the cleaning member 35. Stop. Reference numeral 42 indicates a notch formed at the tip of the pushing member 41.

Next, the baffle member 50 is made of a plate-like material in the embodiment, as can be seen from the cross section of FIG. Then, the resin component flowing in the mixing chamber is provided at a position opposed to the above-mentioned transformation chamber 40 so as to project into the mixing chamber 20 to form a predetermined squeezing gap (C) and to reduce the resin component flowing down in the mixing chamber. It is introduced into the flow chamber 40. The baffle member 50 is integrally connected to the cylinder device 55 at the rear portion as shown in FIG. 2 so that it can move forward and backward. Reference numerals 57 and 58 in the figure denote inlets and outlets of the driving fluid of the cylinder device 55.

When the mixing is stopped, the baffle member 50 is retracted into the inner wall of the mixing chamber 20 so as not to prevent the cleaning member 35 from passing therethrough as shown in FIG. Reference numeral 52 indicates a notch.

(Operation) Next, the operation of the present apparatus 10 will be described.

First, the mixed state will be described with reference to FIGS. 2, 4, and 6.

As shown in the figure, the switching valves 24, 24 are turned on and the mixed resin components are injected from the inlets 21 and 22 into the mixing chamber 20 with the cleaning member 35 retracted. The resin components flow down through the mixing chamber 20 while colliding and being stirred.

A baffle member 50 projects into the mixing chamber 20 immediately below the inflow ports 21 and 22, and the resin component collides with the baffle member 50 and changes its flow. The resin component that has come into contact with the baffle member 50 is introduced into the current-changing chamber 40 through the throttle space C, the flow velocity of which is increased. The initial resin component introduced into the current-changing chamber 40 is the chamber.
Enter the depths of 40 and fill up. Of course, in this case, the chamber volume of the current transformation chamber 40 is adjusted to an appropriate value by moving the pushing member 41 as described later. Then, when the subsequent resin components are continuously introduced, a circulation flow is formed at the inlet of the current transformation chamber 40.
As a result, the stable resin mixture introduced thereafter is discharged while the resin component introduced at the beginning is filled inside the chamber.

In this way, the resin component with poor stirring due to the disturbance of the initial flow of each resin component at the start of mixing is not discharged as it is by adjusting the volume of the current-changing chamber.

The chamber volume for filling the initial flow of the resin component in the current-changing chamber 40 varies depending on the properties of the mixed resin component, the component flow velocity in the chamber, and the like. Therefore, the retracted position of the pushing member 41 is adjusted according to the mixing conditions.

Next, referring to FIG. 3, FIG. 5 and FIG. 7, the time when mixing is stopped will be described.

As shown in FIG. 7, when mixing is stopped, the switching valve 24 is turned off and the injection of each resin component is stopped. Then, as shown in FIGS. 3 and 5, the baffle member 50 is drawn into the inner wall of the mixing chamber 20, and the pushing member 41 is advanced to move the resin component in the current change chamber 40 into the mixing chamber 20.
Push it in. At the same time, the cleaning member 35 passes through the inside of the mixing chamber 20 to discharge the residue of the resin component from the discharge port 31 to the outside. In this way, the current transformation chamber 40 and the mixing chamber 20 are cleaned, and preparation for the next mixing is made.

FIG. 8 is a diagram showing a state immediately before the start of mixing. The state of FIG. 8 is the same immediately after the mixing is stopped.

(Effect) As shown and described above, according to the present invention, the current-changing chamber and the baffle member are provided between the inlet and the outlet, and the resin component flowing down in the mixing chamber is introduced into the current-changing chamber, In particular, since the initial defective component of the resin component is designed to enter the interior of the chamber 40 to fill it, the defective component initially introduced in the state where the subsequent resin component is subsequently introduced. Only the stable mixed resin component after that was discharged while the resin component of was filled in the back of the chamber. Therefore, the conventional problem of poor mixing and stirring due to the disturbance of the initial flow of each resin component at the start of mixing can be eliminated.

Further, according to the apparatus of the present invention, a variable current chamber having a variable volume is provided, and a resin component flowing down the mixing chamber is introduced into the variable current chamber by a baffle member forming a predetermined throttle gap. Therefore, both the high mixing and stirring effect of the resin component and the smooth flow of the discharge component can be obtained.

According to this apparatus, the chamber volume in the current-changing chamber can be easily changed by adjusting the retracted position of the extruding member, so that the best one can be selected according to the mixing conditions, etc. Is large and practical.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view showing a multi-component synthetic resin device according to an embodiment of the present invention, FIG. 2 is an enlarged vertical cross-sectional view of an essential part showing its mixed state, and FIG. FIG. 4 is a horizontal cross-sectional view showing a mixed state, FIG. 5 is a horizontal cross-sectional view similarly showing a mixing stopped state, and FIG. 6 is a vertical cross-sectional view at the time of mixing showing the switching valve mechanism of the embodiment apparatus. 7th
Similarly, FIG. 8 is a vertical sectional view when the mixing is stopped, and FIG. 8 is a vertical sectional view when the mixing start is waited. 10 …… Multi-component synthetic resin mixing device, 20 …… Mixing chamber, 21,22 …… Resin component inlet, 31 …… Discharge port, 35 ……
Cleaning rod, 40 ... current transformation chamber, 41 ... extrusion member, 50 ... baffle member, C ... throttle gap.

Claims (1)

[Claims] 1. A mixing member configured so that a cleaning member (35) reciprocates in a mixing chamber (20) having an inlet (21, 22) for each resin component and an outlet (31) for the mixed component. In the apparatus, a current-changing chamber (40) opening to the mixing chamber is formed between the inlet and the outlet in an orthogonal shape, the chamber volume is changed in the chamber, and the resin component in the chamber is mixed with the mixing chamber. An extruding member (41) that pushes inward is reciprocally fitted and inserted, and a predetermined squeezing gap (C) is formed so as to project into the mixing chamber at a position opposite to the current-changing chamber, and inside the mixing chamber. A multi-component synthetic resin mixing device, characterized in that a baffle member (50) for introducing a resin component flowing down into the flow-changing chamber is movable forward and backward.