JPS59201829A - Multi-component synthetic resin mixing apparatus - Google Patents

Abstract

PURPOSE:To miniaturize a mixing apparatus with a piston change-over mechanism, in injecting resin components to be mixed into a mold while injecting the same into a mixing chamber under pressure to collide and mix the same to each other, by enabling the cleaning of return flowlines of the resin components when mixing is stopped. CONSTITUTION:When a piston rod 20 is retracted, that is, at the same time when the front end of the leading end slide part 21 of said rod 20 opens the inflow ports 11, 12 of a mixing chamber 10, the trailing end part of said slide part 21 is positioned in outflow ports 13, 14. On the other hand, when the piston rod 20 advances, the front end part of the slide part 21 of the rod 20 discharges the components mixture in the mixing chamber 10 to the outside from an emitting port while, in order to form a mixing stop state, that is, the recirculating feed- in state of the resin components, the resins flowed out from the inflow ports 11, 12 are introduced into outflow ports 13, 14 by the notch part provided to the piston rod 20 and returned and recirculated to component tanks.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-component synthetic resin mixing device that mixes chemically reactive resin components and injects the mixture into a mold.

For example, when molding polyurethane resin, predetermined amounts of each of the resin components, including the blown polyinsyanate component and the active hydrogen-containing organic compound component mixed with a reaction catalyst, a blowing agent, a cell control agent, etc., are fed into a mixing device. The resins are mixed and stirred and injected into a predetermined mold as a reactive mixed resin. This type of mixing device includes one that injects each resin component into a mixing chamber at high pressure and causes them to collide, resulting in countercurrent mixing, and one that mixes and agitates each resin component using an agitator that rotates within the mixing chamber. However, this invention belongs to the former high-pressure injection type.

When each mixed resin component is jetted into the mixing chamber from opposing injection ports and mixed in its own flow, a switching valve mechanism is provided to intermittently insert the mixed liquid into the mold. A system is used in which injection and injection stop LL are controlled, and particularly when injection is stopped, each resin component is circulated into each resin component tank via each return conduit.

As a representative example of this system, an overflow groove is provided on the outside of the piston [m], and the overflow groove is used when the adjustment is stopped through the overflow groove. It is known to circulate each resin component into each return conduit. However, in the conventionally known apparatus including the invention mentioned above, it is almost impossible to clean the return flow path of each resin component when the process is stopped.
However, as the pJ wall mechanism such as the piston operates, the residue of each reactive resin component attaches to the overflow groove and obstructs the circulation of the cold liquid, which is the cause of various troubles. It was often the case. Another problem in structural design is that when an overflow groove is formed in the piston, a main body block that is at least as long as the flow of the groove is required, which means that the aspiration device is long and As the size increased, the sliding surface area increased and a powerful drive source was required, resulting in unsatisfactory technical and user satisfaction issues.

The present invention has been proposed in view of the above circumstances, and the main purpose of the present invention is to provide a mixing method that can reliably clean the return flow path of each resin component when mixing is stopped. In addition to providing equipment,
It is an object of the present invention to make it possible to downsize a mixing device having this type of piston-type glue changing mechanism.

That is, the multicomponent synthetic resin mixing device according to the present invention has the following features:
A mixing device configured such that a piston rod is inserted into a mixing chamber and switching between mixing and stopping of mixing of each resin component is controlled by reciprocating movement of the piston rod,
An inlet for each resin component and an outlet for each resin component are formed at opposite positions in the mixing chamber, and an outlet is formed behind the inlet in the axial direction of the piston. An outer circumferential portion is removed in the axial direction to form a notch, and when the piston rod is retracted, the sliding portion surface end opens the inlet, and the sliding portion rear end is located within the outlet. In addition to arranging the
When the rod moves forward, the end of its sliding surface directs the mixed components in the mixing chamber out of the discharge port by υ1, and directs each resin component flowing in through the inflow port to its respective outlet port by means of a notch provided in the piston rod. The gist of this is that it is designed to allow access to the site.

The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a vertical cross-sectional view of a mixing device showing an embodiment of the present invention during mixing (injection), FIG. 2 is a vertical cross-sectional view of the mixing device when mixing is stopped (circulation), and 3VI is a main part of the piston rod. FIG. 4 is an enlarged sectional view of the main parts of the mixing device, FIG. 5 is a sectional view taken along line 5--5 in FIG. 2, and FIG. It is a sectional view taken along line -6.

As can be understood from the overall longitudinal cross-sectional views of FIGS.
, a piston rod 20 that is inserted into the mixing chamber 10 to switch between mixing and mixing stop, and the piston rod 20
It is composed of each part of the Nodame shilling device 30.

The body block 9 has a mixing chamber 10 and an inlet 11.12 and an outlet 13, 14 for each resin component, the inlet 11.12 being connected to the outlet by a respective feed conduit 16a, 17a. 13.14 is each return guide yisb, t
7b to the respective component tanks 16,17. In the figure, reference numeral 15 is a discharge port, and lla and 12a are orifices attached to the inlet ports 11 and 12.

In this invention, as shown in the figure, inlets 11 and 12 for each resin component are provided at opposing positions in the mixing chamber 10, and the inlets 11, 12 are located at the rear of the inlets 1, 1, 12 in the axial direction of the piston (see FIG. A respective outlet 13, 14 is formed in the upper part of the casing. Note that it is recommended that the outlet ports 13 and 14 be formed near the rear end of the mixing chamber 10.

First, the piston rod 2 inserted into the n7 joint chamber lO
o is a cylinder piston 31 of the hydraulic cylinder device 30;
and is configured to reciprocate within the mixing chamber 10 by switching the hydraulic fluid. In the figure, 32 indicates a connector rod, and 33 indicates a connector nut.

In the device of this invention, as can be better understood from FIGS. 3 and 4, the piston rod 20
11 (J inflow 1) leaving the vicinity of the tip as the sliding part 21
”, as shown in the figure,
They are removed in the olt direction to form notches 23 and 24. In general, lots are often large cup-shaped, so the notch 23.2
The shape of 4 will also be approximately as shown in FIG.

Further, the piston rods 20 are arranged in the mixing chamber 10 so as to have the following positional relationship. That is, when the piston port 20 is retracted, when the resin components shown in FIG. Part 21a
opens the inlet 11.12 of the mixing chamber 10, and at the same time,
The sliding portion 21 is arranged such that the rear end 21b is located within the outlet 13.14. On the other hand, when the piston rod 20 moves forward, as shown in FIG. In order to form a state in which the resin components are combined and stopped, that is, a state in which each resin component is circulated, each resin component flowing in from the inlet 11.12 is transferred to the respective outlet ports 13 and 14 by a notch 23.24 provided in the piston rod 20. It is configured to be introduced.

The resin components introduced into the outlet ports 13 and 14 are circulated to each component tank.

In this way, the piston rod 20 having the sliding portion 21 and the notches 23, 24 reciprocates within the mixing chamber 10, thereby opening the inlet 11.12 and opening the notches 23, 24.
The switching process of mixing and mixing stop is sequentially repeated to establish communication between the inlets and the outlets 11 and 13, and 12 and 14.

What is important here is that the entire inner wall of the mixing chamber 10 is IJ-coated by the return movement of the piston port 20. In other words, it goes without saying that when the lot 20 moves forward, the front end 21a of the sliding portion 21 scrapes the inner wall of the four-combining chamber 10 and cleans it, but when the lot 20 moves backward, the sliding portion 21a 2
The rear end 21b of #1 scrapes off the residue of the mixed component adhering to the inner wall of the #y joint chamber 10. Then, the rear end portion 2 of the sliding portion 21
1b is configured to be located within the outlet 13.14 during retraction [1''f, so when reversing,
The interior wall of the joint room from the inlet 11.12 to the outlet 13.14 (the part indicated by 19 in Figure 4) is completely cleaned, and the return flow path during circulation is completely cleaned. It is secured by

As can be understood from Figures 4 to 6,
Residues of the metal component adhering to the rotor notches 23 and 24 are scraped off by the rear end tob of the mixing chamber as the rod 20 moves, and cleaning is performed.

In this way, in the device of this invention, the mixing chamber and the return flow path during H2 mixing and circulation are kept in an extremely good condition with no resin adhesion, and there is no residual resin component as in the conventional method. Various problems such as piston galling that occur due to sticking can now be solved all at once.

Further, according to the present invention, the main body block can be made small and compact, which provides a great advantage in terms of the structural design of the mixing device itself.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a mixing device showing an embodiment of the present invention at the time of 115 minutes (injection), Fig. 2 is a longitudinal cross-sectional view of the mixing device when the mixing is stopped (circulation), and Fig. 3 is a longitudinal cross-sectional view of the piston rod. 4 is an enlarged sectional view of the essential parts of the mixing device, FIG. 5 is a sectional view taken along line 5-5 in FIG. 2, and FIG. 6 is a sectional view taken along line 5-5 in FIG. FIG. 6 is a sectional view taken along line 6-6. 9...Main body block, lO...Mixing chamber, 11.
12... Inlet, 13.14... Outlet, 15
...Discharge [ko, 20...Piston rod, 21
...Sliding part, 21a...Front end part, 21b.
...Rear end, 23.24...Notch, 30.
...Cylinder device. Patent applicant Inoue MCP Co., Ltd. Figure 1 0 Figure 2 Figure 3/21 Figure 4 Figure 5

Claims (1)

[Claims] A piston rod l' (20) is fitted into the merging chamber (10), and switching between 4 merging and 112 merging of each resin component is controlled by the reciprocating movement of the piston rod. The mixing device is configured to have; an inlet (11, 12) for each resin component at opposing positions of the fifth joint chamber (10), and an outlet (13) at the rear in the direction of the piston. , 14) are formed;
The part near the tip of the piston rod 20) is left as a sliding part (21), and the outer peripheral part of the rod corresponding to the inlet is removed in the axial direction to form a notch part (23, 24), and the piston rod is retracted. Sometimes, the sliding part surface end (21a) opens the inlet (11, 12) and the sliding part rear wheel part (21
b) is positioned within the buoy outlet 1'' (13, 14), and when the rod moves forward, its sliding surface end (21a) discharges the mixed components in the mixing chamber from the discharge port. In addition, a notch (23, 24) provided in the piston rod allows each resin component to flow in from the inlet (11, 12).
A multi-component synthetic resin mixing device, characterized in that the device is configured to introduce the respective outflow ports (13, 14) through the respective outlet ports (13, 14).