JPH06182759A - Mixing head - Google Patents

Abstract

PURPOSE:To keep the mixture ratio of a secondary constituent in one shot unvaried and also to improve maintainability in the case when a subordinate discharge port and a secondary constituent flow passage are clogged, in regard to a mixing head. CONSTITUTION:A through hole 4 is formed in a head body 3 and a rod-shaped circulation control valve 5 is inserted slidably into the hole, while a cylinder 1 for driving the circulation control valve 5 is fitted to the head body 3. Two main discharge ports 16 and at least one subordinate discharge port 17 are provided in the peripheral wall of the through hole 4. The main discharge ports 16 and the subordinate discharge port 17 are disposed on one plane 18 intersecting perpendicularly the axis of the through hole 4 so that these ports are opened and closed simultaneously by the sliding motion of the circulation control valve 5. A subordinate nozzle 33 having a secondary constituent flow passage 34 which can communicate with the subordinate discharge port 17 is assembled removably in the head body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing head for producing a synthetic resin material by mixing at least one auxiliary component in addition to two chemically reactive main components,
In particular, the present invention relates to a mixing head suitable for producing a polyurethane resin material.

[0002]

2. Description of the Related Art Conventionally, as a mixing head of this type, for example, a technique disclosed in Japanese Patent Publication No. 63-52568 is known. 5 to 7 schematically show this mixing head, in which a rod-shaped circulation control valve 54 is slidably inserted into a through hole 53 formed in a direction orthogonal to the axis of the head body 52, so that the head body 52 has a circular shape. A rod-shaped discharge control valve 56 is slidably inserted into the through hole 55 formed in the axial direction. On the peripheral wall of the through hole 53, two main discharge ports 57 for separately discharging the two types of chemically reactive main components are provided so as to face each other. Further, a channel 58 for guiding, for example, a coloring component as a secondary component is bored in the center of the circulation control valve 54, and the channel 58 is opened as a secondary discharge port 59 on the tip end surface of the circulation control valve 54, and the coloring component is formed. Are discharged in the axial direction of the through hole 53.

The operation of this mixing head will be described. First, FIG. 5 shows the time of component circulation, and since the circulation control valve 54 is moving forward, each main component moves from the main discharge port 57 to the side surface of the circulation control valve 54. It circulates through the formed long groove 60.
Subsequently, FIG. 6 shows the preparation of the component discharge, and the discharge control valve 56
Retreat to open the through hole 55 and prepare for the next retreat of the circulation control valve 54. Next, FIG. 7 shows the time of component discharge. Since the circulation control valve 54 retracts to open each main discharge port 57 with respect to the through hole 53, the two main components discharged from each main discharge port 57 are The synthetic resin material is generated by mixing with the coloring component discharged from the sub discharge port 59, and is injected into a molding die (not shown) through the through holes 53 and 55.

[0004]

However, in the above mixing head, the sub-ejection port 59 is opened with respect to the through hole 55 by retracting the ejection control valve 56 when preparing the component ejection of FIG. The coloring component remaining in the channel 58 may leak from the sub discharge port 59 into the through hole 55. Since the leaked coloring component is mixed in the synthetic resin material generated in the initial stage of this shot, the mixing ratio of the coloring component is temporarily increased, which causes a problem that color unevenness occurs in the molded product.

When the channel 58 is clogged, the head body 52 is disassembled before the circulation control valve 5 is released.
It was necessary to remove 4 and clean the inside of the channel 58. For this reason, disassembling the head body 52 takes a lot of time, and there is a problem that maintainability is poor or oil in the cylinder 61 leaks out when the circulation control valve 54 is pulled out.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and prevent a problem that a secondary component leaks from the sub-ejection port before the main component is ejected from the main ejection port, thereby preventing the sub-component in one shot. It is an object of the present invention to provide a mixing head capable of maintaining a constant mixing ratio of secondary components and improving maintainability when clogging occurs in the sub-ejection port or the sub-component flow path.

[0007]

In order to solve the above problems, according to the present invention, a through hole is formed in the head body, and a rod-shaped control valve is slidably inserted into the through hole. Is attached to the head body, and two main outlets for separately ejecting two kinds of chemically reactive main components into the mixing chamber of the through hole are opposed to the peripheral wall of the through hole. In the mixing head provided as described above, at least one auxiliary discharge port for discharging a secondary component to the mixing chamber is provided on the peripheral wall of the through hole, and the main discharge port and the sub discharge port slide on the control valve. The means for arranging the main discharge port and the sub discharge port on one orthogonal plane with respect to the axis of the through hole is adopted so as to be opened and closed at the same time (claim 1).

Further, it is preferable that a sub-nozzle provided with a sub-component flow passage that can communicate with the sub-ejection port is detachably incorporated in the head body (claim 2).

[0009]

According to the mixing head of the present invention, since the main discharge port and the sub discharge port are arranged on one orthogonal plane with respect to the axis of the through hole, the main discharge port and the sub discharge port are control valves. Is simultaneously opened with respect to the through-hole by the sliding of, and the ejection timings of the main component and the secondary components match. Therefore, the secondary component remaining in the secondary ejection port or the secondary component flow path in the previous shot does not leak to the through hole before the start of the ejection of the main component. Therefore, the mixing ratio of the secondary components in one shot can be kept constant. Moreover, since the sub-ejection port is provided on the head body side instead of the control valve side,
When the sub-ejection port or the sub-component flow path is clogged, it is not necessary to disassemble the head body or remove the control valve during maintenance. Therefore, the maintainability is improved, and even when a cylinder is used as the drive means of the control valve, there is no concern that the oil will leak.

Further, if the sub-nozzle provided with the sub-component flow passage that can communicate with the sub-ejection port is detachably incorporated in the head body, it is not necessary to disassemble the head body in the above maintenance. By removing the sub nozzle from the head body, the sub ejection port and the sub component flow path can be easily cleaned. Therefore, the maintainability is further improved.

[0011]

EXAMPLES An example in which the present invention is embodied in a three-component mixing head for producing a polyurethane resin material will be described below with reference to FIGS. As shown in FIG. 1, in the mixing head of this embodiment, a head body 3 is attached to a cylinder 1 via a body flange 2, and a through hole 4 is formed at the center of each of the body flange 2 and the head body 3. ing. A circulation control valve 5 is slidably inserted into the through hole 4, and its base end is the cylinder 1
Is connected to the piston 6 via a holding plate 7.

A circulation control valve 5 is provided at both ends of the head body 3.
Sleeves 8 and 9 for slidingly guiding are inserted. The sleeve 8 on the base end side is inserted into the body flange 2 at a half thereof, so that the body flange 2 and the head body 3 are
It also has a function of positioning the through hole 4 on the same axis. A pair of upper and lower long grooves 10 are engraved in the front half of the side peripheral surface of the circulation control valve 5, and a tip end portion of a detent pin 11 screwed to the head body 3 is fitted into each long groove 10. Then, as the piston 6 reciprocates, the circulation control valve 5 is guided by the sleeves 8 and 9 to slide between the forward movement position shown in FIG. 1 and the backward movement position shown in FIG. A mixing chamber 12 is formed in the through hole 4 in front of the tip surface of the.

As shown in FIGS. 2 and 3, the head body 3 at the position where the mixing chamber 12 is formed has a pair of upper and lower main nozzle insertion holes 13 and one side sub-nozzle insertion hole 14. It is formed in a direction orthogonal to the axis of the through hole 4. The bottom wall 15 of each of the insertion holes 13 and 14 constitutes a part of the peripheral wall of the through hole 4, and a pair of main discharge ports that open vertically in the mixing chamber 12 face each other at the center of each bottom wall 15. An outlet 16 and one sub discharge port 17 that is orthogonal to these and opens into the mixing chamber 12 are formed.

The main discharge port 16 and the sub discharge port 17
Is opened and closed at the same time by sliding the circulation control valve 5,
As shown in FIG. 4, they are arranged on one orthogonal surface 18 with respect to the axis of the through hole 4. In addition, the main discharge port 1 of this embodiment
6 and the sub discharge port 17 have the same shape (round hole) and the same diameter. The main discharge port 16 and the sub discharge port 17
In the case where the shapes and dimensions are different, it is advisable to align the positions of the respective edges of the main discharge port 16 and the sub discharge port 17 so that the retracting circulation control valve 5 begins to open at the same time.

A main nozzle 19 is provided in each main nozzle insertion hole 13.
Is detachably inserted, and a nozzle holder 20 for pressing and holding each main nozzle 19 is attached to the outer surface of the head body 3. Each main nozzle 19 is formed with a tapered orifice 21 communicating with the main discharge port 16 and a main component flow path 22 connected to the orifice 21. In addition, a supply port 23 to which a supply pipe (not shown) extending from the main component tank is connected inside each nozzle holder 20.
And a supply passage 24 communicating with the main component passage 22 of the main nozzle 19.
And are formed continuously.

A needle 25 is inserted through each nozzle holder 20 and the main nozzle 19, and an orifice 21 is provided at the tip thereof.
A tapered valve portion 26 that opens and closes is formed. The needle 25 has a threaded portion 27 that is screwed into the nozzle holder 20, and a lock nut 28 is screwed onto the threaded portion 27. Then, by rotating the needle 25,
The valve portion 26 can adjust the opening degree of the orifice 21 to adjust the discharge pressure of the main component.

On the other hand, a reflux hole 29 is formed in the head body 3 behind each main nozzle 19, the inner end of which communicates with the long groove 10 of the circulation control valve 5, and the outer end of which is closed with a screw plug 30. The middle is connected to the return port 31 of the head body 3. The reflux port 31 is connected to the main component tank via a return pipe (not shown) so that the main component can be circulated to the main component tank when the circulation control valve 5 advances. The circulation control valve 5 is provided with a plurality of annular grooves 32 on both sides of the long groove 10, and a sealing material (not shown) is formed in each annular groove 32 by a reaction-solidified polyurethane resin.

A sub nozzle 33 is detachably screwed into the sub nozzle insertion hole 14. This sub nozzle 3
A sub-component flow path 34 communicating with the sub-discharge port 17 is formed at the center of the sub-portion 3, and a supply pipe 35 extending from a sub-component tank (not shown) is connected to the sub-component flow path 34. It is possible.

Next, the operation and effect of the mixing head of the present embodiment constructed as above will be described.

Two kinds of chemically reactive main components, that is, a polyol component and an isocyanate component for producing a polyurethane resin material are stored in separate main component tanks, and for example, a supply pipe extending from the main component tank of the polyol component is provided. The supply pipe connected to the upper nozzle holder 20 and extending from the main component tank of the isocyanate component is connected to the lower nozzle holder 20. In addition, a coloring component (a pigment dissolved in a polyol component) as a subsidiary component is stored in the subsidiary component tank, and the supply pipe 35 is stored in the subsidiary nozzle 3.
Connect to 3.

First, during circulation of the components shown in FIG. 1, since the circulation control valve 5 is moving forward, the main components, the polyol component and the isocyanate component, are respectively discharged from the main discharge port 16 into the long groove 10 → recirculation hole 29 → recirculation port. It circulates to the main component tank via 31.

Next, when the components shown in FIGS. 2 and 3 are discharged, the circulation control valve 5 is retracted to open the main discharge ports 16 and the sub discharge ports 17 to the mixing chamber 12, so that as shown in FIG. In addition, the polyol component A, the isocyanate component B, and the coloring component C discharged from the respective main discharge ports 16 and the sub discharge ports 17
Are collision-mixed with each other to produce a synthetic resin material, which is injected through a through hole 4 into a molding die (not shown).

At this time, both main discharge ports 16 and sub discharge ports 1
Since 7 is opened simultaneously with respect to the mixing chamber 12 by retreating the circulation control valve 5, the discharge timings of the polyol component A, the isocyanate component B, and the coloring component C are the same. Therefore, the coloring component remaining in the subsidiary component flow path 34 on the previous shot does not leak to the through hole 4 before the discharge of the polyol component A and the isocyanate component B is started. Therefore, the mixing ratio of the coloring components in one shot can be kept constant, and color unevenness of the molded product can be prevented.

The auxiliary discharge port 17 and the secondary component flow path 34 are also provided.
When the inside is clogged, without removing the head body 3 or removing the circulation control valve 5, the sub nozzle 33 is screwed off from the head body 3 and removed.
7 and the inside of the secondary component flow path 34 may be cleaned. Therefore,
Excellent maintainability, and there is no risk of oil leaking from the cylinder 1.

The present invention is not limited to the above-described embodiments, but may be embodied by appropriately modifying the invention as follows, for example, without departing from the spirit of the invention.

(1) A second auxiliary discharge port (not shown) is provided on the peripheral wall of the through hole 4 at a position facing the auxiliary discharge port 17, and a secondary component flow path that can communicate with the auxiliary discharge port is provided. The sub-nozzle provided should be detachably incorporated into the head body 3. If the coloring component is also discharged from the second sub-discharging port, the coloring component collides with the polyol component and the isocyanate component from both sides thereof, so that better mixing can be realized. In addition, a coloring component of another color or a secondary component (catalyst or the like) other than the coloring component can be discharged from the second sub-discharging port.

(2) Applying to a mixing head for mixing and producing various synthetic resin materials other than the polyurethane resin material.

[0028]

As described in detail above, according to the mixing head of the present invention as set forth in claim 1, the subsidiary component leaks from the sub-ejection port before the main component is ejected from the main ejection port. Can be prevented, and the mixing ratio of the secondary components in one shot can be kept constant. Further, when the sub-ejection port or the sub-component flow passage is clogged, it is not necessary to disassemble the head body or remove the control valve in the maintenance, and the maintainability is improved.

Further, according to the mixing head of the present invention as defined in claim 2, there is no need to disassemble the head body during the maintenance, and the maintainability is further improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mixing head according to an embodiment of the present invention during component circulation.

FIG. 2 is an enlarged cross-sectional view showing the vicinity of a nozzle during component ejection of the mixing head of FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a perspective view showing the vicinity of a discharge port of the mixing head of FIG.

FIG. 5 is a sectional view of a conventional mixing head during component circulation.

FIG. 6 is a sectional view of the same mixing head at the time of preparation for component ejection.

FIG. 7 is a cross-sectional view of the same mixing head when ejecting components.

[Explanation of symbols]

 1 Cylinder 3 Head Body 4 Through Hole 5 Circulation Control Valve 6 Piston 12 Mixing Chamber 16 Main Discharge Port 17 Sub-Discharge Port 18 Orthogonal Surface 33 Sub-Nozzle 34 Sub-Component Flow Path

Claims (2)

[Claims] 1. A through hole is formed in a head body, a rod-shaped control valve is slidably inserted into the through hole, and a drive means for the control valve is attached to the head body to allow a chemical reaction. In a mixing head provided with two main outlets for separately ejecting the main component of the seed into the mixing chamber of the through hole, facing each other to the peripheral wall of the through hole, the secondary components are discharged into the mixing chamber. At least one auxiliary discharge port is provided on the peripheral wall of the through hole, and the main discharge port and the auxiliary discharge port are opened and closed at the same time by sliding the control valve. A mixing head arranged on one orthogonal plane with respect to the axis of the mixing head. 2. The mixing head according to claim 1, wherein a sub-nozzle having a sub-component flow path that can communicate with the sub-ejection port is removably incorporated in the head body.