JPS59201828A - 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 into a mold while injecting the same in a mixing chamber under high pressure to collide and mix the same to each other, by enabling the cleaning of the return flowlines of the resin components when mixing is stopped. CONSTITUTION:When a piston 30 is retracted, inflow ports 11, 12 of resin components are opened and the resin components are injected into a mixing chamber to be countercurrently mixed while the resulting mixture is emitted from an emitting port 15. On the other hand, when the piston 30 advances, the component mixture in the mixing chamber 10 and the components remaining in the recessd grooves 21, 22 are discharged from the emitting port 15 and, with the movement of protruded parts 31, 33, the recessed grooves 21, 22 are sealed so as to communicate the respective inflow port and the outflow port with ports 11, 13 and 12, 14 to introduce the resin components flowed into the inflow ports 11, 12 and into the outflow ports 13, 14 through return flowlines and, subsequently, to return and recirculate the same 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 raw resin components and injects the mixture into a mold.

For example, when molding polyurethane resin, predetermined amounts of each of the organic polyiso/anate component and the active hydrogen-containing organic compound component mixed with a reaction catalyst, blowing agent, air conditioning agent, etc. are sent to a mixing device. The resin is injected, mixed and stirred, and then poured 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 through the opposing injection ports and mixed in countercurrent, a switching valve mechanism is provided to intermittently feed the mixed liquid into the mold. A system is used in which the injection of the components into the mixing chamber and the stop of the injection are controlled, and in particular, when the injection is stopped, each resin component is circulated and sent to each resin component tank via each return conduit.

A representative example of this method is disclosed in Japanese Patent Application Laid-open No. 46-1536 (Japanese Patent Publication No. 55-26968), in which an overflow groove is provided on the outer surface of the piston, and through the overflow groove, various It is known to circulate the sugar beet component into each return conduit. However, in the conventionally known apparatus including the invention described in (A), it is almost impossible to clean the return flow path of each resin component when mixing is stopped, and therefore the residue of each reactive resin component is removed. As the switching mechanism such as the piston operates, it tends to block the overflow groove and prevent the circulation of the liquid. Another problem in structural design is that if the piston has an overflow groove, a main body block that is at least as long as the sliding length of the groove is required, making the pumping device long and large. At the same time, the sliding area was too large and required a powerful drive source, which left users unsatisfied.

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 device that is capable of cleaning the return flow path of each resin component when mixing is stopped. At the same time, it is possible to downsize a mixing device having this type of piston-type switching mechanism.

That is, the multicomponent synthetic resin mixing device according to the present invention has the following features:
A cylinder mixing device is constructed such that a cylinder piston is inserted into a mixing chamber having an inlet and an outlet for each resin component, and switching between mixing and mixing stop is controlled by the reciprocating movement of the seven cylinder pistons. Concave grooves extending parallel to the axial direction of the cylinder piston to the discharge ports are formed at opposing positions in the mixing chamber, and inlets and outlets for each resin component are formed in each groove. /A convex portion corresponding to the above-mentioned groove is not provided on the outer periphery near the tip of the cylinder piston, and when the piston moves backward, the inlet for each resin component is opened, while when the piston moves forward, the inlet for each resin component is opened. The mixed components in the mixing chamber are discharged to the outside from the discharge port, and each groove is sealed by the convex portion, and each resin component flowing into the groove from the respective inlet is directed to the respective outlet. The gist of this is that it has been made possible to introduce the system. The present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the mixing device of the present invention during mixing (injection), Fig. 2 is a longitudinal cross-sectional view of the same when mixing is stopped (circulation), and Fig. 3 is a Norinda piston. A perspective view showing the tip; FIG. 4 is a sectional view taken along line 4-4 in FIG. 1;
FIG. 5 is a sectional view taken along line 5--5 in FIG. 2. As shown in the figure, the device of the present invention includes a main body block 9 having a mixing chamber 1o, a cylinder piston 30 that is inserted into the mixing chamber 10 to switch between mixing and mixing stop, and a seven-ring device for the cylinder piston 3o. It consists of 40 parts.

The main block 9 has a mixing chamber 10 and an inlet 11.12 and an outlet for each resin component reservoir, and the inlet 11.12 is connected to the outlet by a respective feed conduit 16a, 17a. 13° 14 are respective return conduits 16b, 1
7b to the respective component tank 16.1'7. In the drawing, reference numeral 5 is a discharge port, and uni a and yu 2a are injection nozzles attached to the inlet ports 11 and 12.

In this invention, in particular, there are discharge ports 15 in opposing positions of the mixing chamber 10 parallel to the axial direction of the cylinder piston 3o.
Concave grooves 21 and 2.2 are formed respectively, and in the concave grooves 21 and 22, respective inflow and outflow ports ]-] and 13.12 and ]-4 are provided for each resin component. There is. The inflow port is on the discharge port 15 side of the recesses 13421 and 22].

], 12. It goes without saying that outlet ports 13 and 14 are provided on the inner side of the main body block. Note that it is preferable to provide an outlet 13.14 near the rear end of the groove 21.22 as shown in the figure. The cross-sectional shape and size of the grooves 21 and 22 can be arbitrarily designed.

On the other hand, the cylinder piston 30 is reciprocated by a hydraulic cylinder device 40, and protruding portions 31 and 32 corresponding to the grooves 21 and 22 are provided on the outer periphery near the tip 30a. In the embodiment, as shown in FIG. 3, by forming a break at the tip 30a of the piston rod, fitting a plate 35 therein and fixing it with a bolt 36, a -C convex portion 3],
.

32 was formed. The shape of the convex portions 31 and 32 is determined in accordance with the cross-sectional shape of the three front grooves 21 and 22, and the structure for forming the convex portions 31 and 32 is selected appropriately depending on the shape, etc. There will be.

As shown in FIG. 1, the cylinder piston 30 has convex portions 3 and 32 corresponding to the concave grooves 21 and 22, and when the piston is retracted, the inlets 11 and 12 for each resin component are provided.
is opened, the resin component is injected into the mixing chamber, mixed in countercurrent, and discharged from the discharge port 15. At this time, the convex portions 31 and 32 of the piston 30 are connected to the inlets 11 and 32 of the concave grooves 21 and 22, respectively.
12 and the outlet ports 13 and 14, as shown in FIG. 4, blocking the grooves 21 and 22.

On the other hand, when the piston 30 moves forward, as shown in FIG.
All components, including those remaining in the discharge port 15, are discharged to the outside through the discharge port 15, and as the convex portions 31 and 32 move,
The grooves 21 and 22 are sealed so that the inlets and outlets 11 and 13, 12 and 14 are in communication with each other, and the resin components flowing from the inlets 11 and 12 are transferred to the sealed grooves. Return channel 23, 24 consisting of 21 and 22
It is introduced into each outlet 013 and 14 through. Outflow section 13.1
The resin components introduced in 4 are returned to each component tank and circulated.

In this way, the convex portions 31 and 32 protruding near the tip of the cylinder piston 30 slide within the grooves 21 and 22 with the reciprocating movement of the cylinder piston, so that the inlet 1
The switching process of forming return channels 23 and 24 by opening 1.12 and closing recesses rt and 't is successively repeated.

What is important here is that as the cylinder piston 30 moves forward, the inner wall of the mixing chamber 10 and the inside of the recirculator 21. This means that the return flow path during circulation is ensured in a perfect condition. That is,
When an overflow groove is formed on the cylinder screw side as in the conventional case, it is almost impossible to clean the overflow groove mouth body, and the overflow is caused by the interference of the reaction resin component. Although the grooves were loose and tightened, the present invention was able to solve this problem with the extremely simple configuration described above.

If a groove is formed in the axial direction of a twisted cylinder piston, the strength of the piston rod may be weakened by the groove, and the main block must be made longer and thicker to accommodate the movement of the groove. However, in the device of this invention, a concave groove is formed in the mixing chamber, so the strength of the piston rod is not weakened, and the main block can be made compact and compact. This has made it possible to have great advantages in terms of the structural design of the mixing device itself.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the mixing device of the present invention during mixing (injection), Fig. 2 is a longitudinal sectional view of the same when mixing is stopped (circulation), and Fig. 3 is the tip of the cylinder piston. Figure 4 is a sectional view taken along line 4 of Figure 1, and Figure 5 is a sectional view taken along line 5-5 of Figure 2. , ]0...Mixing chamber, 1
-, +-, 1,, 2... inlet, ], 3.14
... Outlet port, ]5... Discharge port, 2],, 22...
・Concave groove, 23.24...Return channel, 30...
/ cylinder piston, 40... cylinder device. Patent applicant Inoue MCP Co., Ltd. Figure 1 0 Figure 2

Claims (1)

[Claims] A shilling piston (30) is fitted into a mixing chamber (0) having an inlet (11, 12) and an outlet (03, 4) for each resin component reservoir. Switching between mixing and mixing stop is Wf! A mixing device configured to be controlled by: a recess 1 extending parallel to the axial direction of the Schilling piston (3o) and extending to the discharge port (15) at opposing positions of the mixing chamber (10);
', Sj (21, 22) are formed respectively, and in each time iW (21, 22), the respective inlets and outlets (11, 13, 12, and 4) of each resin component are formed. Along with this, a protrusion (32) corresponding to the grooves (21, 22) is protruded on the outer periphery near the tip of the shilling piston (3o), and when the piston (3o) retreats, each resin The component inflow port (II, '12) is opened, and when the piston (30) moves forward, the mixed components in the mixing chamber are discharged to the outside through the discharge port, and the convex portions (31, 32)
The grooves (21, 22) are closed by the respective inlets (11, 12) and the resin components flowing into the grooves N'41# (21, 22) are blocked by the respective outlets (13, 14).
) A multicomponent synthetic resin mixing device characterized in that it can be introduced into a device.