JPS62128705A - Mixing head - Google Patents

Abstract

PURPOSE:To reduce the maintenance time and to prevent the occurrence of dispersion of the gushing quantity of each raw material liquid by forming a throttle valve, by which the degree of opening is adjustable, at the extreme point of a rod-like value body. CONSTITUTION:When a rod-like valve body 5 moves from being in the state of the front dead point to the back dead point, a throttle valve 65 projected outside from a head main body 23 faces to gushing holes 28, 32 of each circulating paths 29, 33. At this moment, upperside and lowerside projected plates 67 and 69 shut specified quantities of the gushing holes 28 and 32 respectively. Then the throttle valve 65 rotates on left and right, the degrees of opening of the gushing holes 28, 32 are continuously adjustable and the increasing and decreasing quantities of the degrees of opening of the gushing holes 28, 32 are proportionally carried out as the projected plates 67, 69 are symmetrically formed. The nozzles to be necessary for each mixing head and the valves for adjusting the quantity of flow to be set on the nozzles become thereby unnecessary and specified quantities can be fixed by each throttle valve or each circumference of the gushing hole. Packing of the raw material in the paths thereby hardly occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a mixing head for multicomponent liquid plastic raw materials.

<Prior Art> Conventionally, a mixing head for multi-component liquid plastic raw materials has been used, for example, as shown in FIG. 16.17 (see Japanese Patent Publication No. 55-26968, etc.).

This mixing head communicates with the shilling chamber 2 on the base side in the axial direction of the head block 1 to form a through hole 3, and also communicates with the through holes 3 on each negative side and has A liquid ejection holes φ.
A return hole 4.5 and a B liquid ejection hole/return hole 6.7 are formed. Naturally, the axes of the A liquid jetting hole 4 and the B liquid jetting hole 6 are aligned. Here, the A liquid/B liquid ejection holes 4.6 are formed by A liquid/B liquid nozzles 8, 9, which are removably attached to the head block 1, respectively. The inner periphery of each nozzle 8.9 is funnel-shaped and reduces in diameter to the ejection hole 4.6, and the tip of each nozzle 8.9 is conical along the inner periphery.15 valves 14. 1
5 is inserted, for example via a conventional hydraulic adjustment device (not shown). Each of these flows j11, control valve 14.1
5 and an annular gap 1 formed between the inner circumference of the nozzle 8.9
6.17, liquid A and liquid B will be distributed. and,
By moving each IAL:il adjustment valve 14.15 in the axial direction of the nozzle, the portion of each annular gap 16.17 immediately 1tI of the ejection holes 4, 6 can be adjusted steplessly ( Becomes Noh.

A cup-shaped valve body 12 having circulation grooves 10° and 11 on both sides of the intermediate portion is slidably installed in the through hole 3. This rod-shaped valve body 12 is connected to a piston 13 in the cylinder chamber 2 and is hydraulically driven.

Next, to explain the operation of this mixing head using reaction injection molding of urethane as an example, first, as shown in FIG. ) and B liquid (polyol component) by operating pumps (not shown) and passing between each stock solution tank (not shown) A liquid spout hole 4 → circulation groove to A liquid return hole 5
Alternatively, after circulating the B liquid for a predetermined period of time through the B liquid ejection hole 6, the ring groove 11, and the B liquid return hole 7, as shown in FIG. Groove 10, ti
is closed, and liquids A and B are jetted out at high pressure from the liquid A/liquid ejection holes 4.6, collide and mix just before the tip surface of the rod-shaped valve body 12, and are injected axially forward of the rod-shaped valve body 12. During this high-pressure collision mixing of liquids A and B, each liquid is ejected by adjusting the flow control valves 14 and 15.

<Problems to be Solved by the Invention> However, the conventional mixing head having the L configuration has the following problems.

(a) The annular gap 16.17 and the small-diameter spout 4.6 are likely to become clogged with raw materials, and in that case, the nozzle 8.
9 must be disassembled and maintenance is time consuming.

(b) Since the flow control valves 14 and 15 are provided for each raw material liquid, the mixing head becomes larger and there is a risk that variations may occur in the ejection range of each raw material liquid.

Means for Solving the Problems> The present invention has been made to solve the problem described in E. A through hole is formed in the head body, and each hole opening in the side wall of the through hole is formed in the head body. Equipped with a spout for raw material liquid,
When the rod-shaped valve element is inserted into the through hole for reciprocating motion and the rod-shaped valve element is located at the front dead center, each raw material liquid is circulated between the raw material tank and the rod-shaped valve element is positioned at the rear dead center. When located at This is a mixing head having a configuration in which a valve portion is formed.

<Example> Hereinafter, the present invention will be described in detail by taking a mixing head for reaction injection molding of urethane as an example.

First Embodiment Figure 1 is a cross-sectional view of the mixing head 21 of this example, and Figure 2 is a schematic diagram showing the circulation flow path for liquid A (polyisocyanate) and liquid B (polyol component). This is a perspective view 14.

The head body 23 of the mixing head 21 of the embodiment has a through hole 25 located at the sprue ff1l line of the mold, and a rod-shaped valve body 51 (see FIG. 5) is inserted into this through hole 25 in the axial direction. It is inserted into the sliding opening 1. As shown in FIG.
A circulation channel 29 for liquid A is formed from the liquid inlet 27 to the L side of the through hole 25 . Similarly, an fI circulation path 33 for the B liquid is formed below the through hole 25 from the B liquid inlet 31 formed on the other side of the head body 23 .

Each circulation channel 29.33 has a spout 28.32 facing the through hole 25 in the front cylindrical part 24 of the head body 23. Of course, the axes of these jet ports 28, 32 coincide. Each of the ll1IyJ flow paths 29°33 is, for example, erected in the L direction on the upper surface of the head main body 23,
After being separated by the plunger insertion hole 35, A liquid, B liquid
The liquid reaches the liquid outlet 37°39.

The plunger insertion hole 35 is as shown in FIG.

LJJ replacement plunger 41 is plunger fitted) Φ hole 3
1 so as to be movable in the axial direction of 5. It is preferable that the switching plunger 41 is controlled by the same hydraulic system as the rod-shaped valve body 51, and the movement of both is cyclic.
The replacement plunger 41 has a large diameter portion 43.44 and a small diameter portion 45.46 having the same diameter as the plunger insertion hole 35, corresponding to each circulation passage 29.33. As shown in FIG.
4 at the same time, and liquids A and B are simultaneously distributed from below as shown in FIG. Note that FIG. 4 is a partial cross-sectional view taken along the line of arrow rV-rV in FIG. The A liquid will flow through the annular gap 47 formed between them. Similarly, the B liquid flows through the annular gap 48. On the other hand, when the νJ exchange plunger 41 moves to the left in FIG. 3, the large diameter portion 43.44 simultaneously faces each cut 30.34 of the circulation flow path 29.33, and the annular gap 47.48 is simultaneously closed. Ru. Therefore, by reciprocating one switching plunger 41, liquid A,
The circulation wave paths 29 and 33 of liquid B are opened and shielded at the same time.

Next, the rod-shaped valve body 51 that is inserted into the through hole 25 of the head main body 23 will be explained.

FIG. 5 shows a side view of the rod-shaped valve body 51, and the rod-shaped valve body 51 of the embodiment has a rod portion 53. First seal groove portion 55, shielding valve portion 5
7. It consists of a second seal part 59 and a throttle valve part 65, and a flange part 61 attached to the piston 77 of the actuating device 75 is provided at the rear end (see FIG. 1). An oval keyway 54 is bored.

Further, the first seal portion 55. Seal grooves 56 and 58 are formed in the second seal portion 59 in the circumferential direction, respectively.
When liquids A and B flow into 6.58, they react to form a urethane seal, exhibiting a self-sealing effect. Of course, a seal ring may be attached to each seal groove 56,58.

From the second seal portion 59 to the shielding portion 57 and the first seal portion 55
The horizontally elongated portion formed over the area indicates the circumferential surface of the sealing member 63. The sealing member 61 is a plate-like member made of fluororesin and has a substantially trapezoidal cross section with an arcuate upper side. As shown in (cross-sectional view along the arrow line -Vl), two dovetail grooves 63 formed on both sides of the rod-shaped valve body 51 are implanted. When the shielding valve part 57 shields the spout 28.32 (the state shown in FIG. 1), this sealing member 61 brings its outer circumferential surface into close contact with the peripheral wall of the through hole 25, thereby discharging the A liquid.

The B liquid is prevented from leaking around the shield valve portion 57 in the circumferential direction. Note that the sealing member 61 is not limited to the fluororesin mentioned above, as long as it is made of a material softer than the peripheral wall of the through hole 25 (usually made of steel), and may also be made of other synthetic resins such as polyacetal, soft metals, ceramics, etc. It can also be formed using

The throttle valve part 65 formed at the tip of the rod-shaped valve body 51 has a seventh
As shown in the figure, protruding pieces 67 and 69 having an arcuate cross section are formed at the bottom, and are formed separately from the other parts constituting the rod-shaped valve body 51, and are rotated in the circumferential direction with the first screw or the like. movably fixed.

From the state shown in FIG. 1 in which the rod-shaped valve body 51 is at the front dead center, the piston 77 of the actuating device 75 is moved to the left in the figure, and the rod-shaped valve body 5
1 to the rear dead center (see Fig. 8), the throttle valve part 65 protruding from the head body 23 to the outside is filled with liquids A and B.
Opposed to the spout 28.32 of each circulation wave channel 29.33 of liquid. At this time, as shown in FIG. 9 (showing a cross section taken along arrow IX-IX in FIG. 8), the protruding piece 67 on the H side shields the spout 28 to a certain extent, and similarly the protruding piece 69 on the lower side shields the spout 28. 32 is covered by a predetermined stitch. In FIG. 9, when the throttle valve part 65 is rotated left and right, the opening amount of the spout 28, 32 can be adjusted steplessly, and the protruding pieces 67 and 69 are formed symmetrically. In this case, the opening amount of each jet port 28, 32 is increased or decreased in proportion.

In addition, FIG. 10 shows the ninth position when the rod-shaped valve body 51 is at the front dead center.
Showing a cross-sectional view of the same part as the figure (cross-sectional view taken along the line XX in FIG. 1), the openings 28.3 of each circulation channel 29°30
2 is completely shielded by a shield valve section 57.

Next, the operation of the ice warming head 21 will be explained.

First, the rod-shaped valve body 51 is positioned at the front dead center as shown in FIG. 1, and each small diameter portion 4 of the switching plunger 41 is
5.46 is placed opposite each cut 30.34 of the circulation path 29.30. Then, pumps (not shown) are operated to transport liquid A and B between each raw material tank (not shown).
Liquid input hole 27 → circulation channel 29 → annular gap 47 → liquid outlet 37
Alternatively, the liquid is circulated for a predetermined period of time via the liquid inlet 31 → circulation channel 33 → annular gap 48 → liquid outlet 39.

Next, as shown in FIG. 8, the rod-shaped valve body 51 is positioned at the rear dead center,
Then, the switching plunger 41 in FIG. 3 is moved to the left so that the large diameter portion 43.44 faces the cut 30.degree. 34, thereby simultaneously blocking each circulation flow path 29.33. Liquids A and B pressurized to high pressure by the pump are jetted out at high pressure from each spout 28, 32 as shown in FIG. It will be ejected forward in the axial direction.

After that, the rod-shaped valve body 51 is moved again to the front dead center (as shown in Fig. 1!iB).
), the throttle valve portion 65 projects from the front cylindrical portion 41 of the head body 23, so that cleaning fi+ can be performed as necessary.

In addition, in the mixing head 21 mentioned above, the ejection ports for each raw material liquid may be formed at deeper positions than the through holes 25, and in that case, the rod-shaped valve body 51 will also be correspondingly shortened and will not reach the front dead center. Even at some point, the throttle valve 165 does not protrude from the head body 23.

In addition, when mixing three or more types of raw material liquids, liquid inlets, circulation channels, jet ports, and liquid outlets are formed according to the number of raw material liquids. At this time, each jet port is designed so that its axis intersects approximately at the center of the through hole 25, and a cylinder fitting hole is formed so as to linearly penetrate each circulation flow path. Further, an axial sealing member is embedded in the circumferential surface of the shielding valve portion of the rod-shaped valve body so as to divide each jet port.

The mixing head 21 of this embodiment, which has been described hereafter, is characterized by the fact that a throttle valve part 65 that can rotate in the circumferential direction is formed at the tip of the rod-shaped valve body 51.

Of course, if this throttle valve part 65 is formed at the tip 12a of the rod-shaped valve body 12 of the mixing head of the conventional example (Fig. 16.17), the nozzle 8°9 and the IItlIt adjustment valve 14.15 will become unnecessary, and the parts will be reduced. In addition to reducing the number of points, if the ejection holes 4.6 for each raw material liquid are expanded, the occurrence of "clog" can be almost eliminated.

In addition, when three or more kinds of raw material liquids are mixed, protruding pieces are formed according to the spout ports of each raw material liquid.

Second Embodiment (Figs. 11 and 12) Fig. 11 is a perspective view of the throttle valve section 66 applied to the mixing head of this embodiment, and Fig. 12 is a sectional view of the ejection port portion (
9 is a sectional view of the same part as in FIG. Valve part 65
The ends of each of the protruding pieces 67 and 69 are cut out into convex or concave curved surfaces to form protruding pieces 68 and 70.

When this throttle valve part 65 is used, as shown in FIG. 12, the flow of liquids when ejecting liquids A and B becomes smoother.

Third Embodiment (Figures 13 to 15) A feature of the mixing head of this embodiment is that, in the mixing head of the first embodiment, a throttle valve part having an orifice formed on the opposing inner wall of the cylindrical member is adopted. It is something.

The throttle valve section 81 shown in FIG. 13 has a configuration in which a circular orifice 85 facing the center is bored into the peripheral wall of a cylindrical member 83 with the same axis. Note that the orifice 85 may have a tapered shape. This throttle valve part 81 makes the orifice 85 face each jet port 28.32 when the rod-shaped valve body 51 is at the after dead center, and directly throttles the opening amount of each jet port 28.32 to the opening amount of the orifice 85. That will happen. Therefore, it is suitable when the amount of ejection of each raw material liquid is small. By rotating the throttle valve part 81 in the circumferential direction, the peripheral edge of each jet port 28.32 opens the orifice 85 (17).
is adjusted.

A throttle valve part 87 in FIG. 14 shows another aspect of this embodiment, and is one in which the orifice 85 in the throttle valve part 81 in FIG. 13 is expanded in the circumferential direction to form an elongated orifice 89. be.

The throttle valve section 91 in FIG. 15 shows another aspect of this embodiment, and the orifice 85 in the throttle valve 1n181 in FIG.
is expanded in the axial direction to form an elongated orifice 93. This throttle valve part 91 has the same effect as that shown in FIG. 13, but since the orifice 93 is formed long in the axial direction, the throttle valve part 91 can be moved in the axial direction with respect to the rod-shaped valve body 51. As a result, the opening amount of the orifice 93 can be adjusted at the periphery of the spout 28.32. Therefore, the cross sections of the cup-shaped valve body 51 and the throttle valve part 91 are square.

It is possible to make it into a prismatic shape such as a hexagon.

<Effects of the Invention> As explained above, the mixing head of the present invention is provided with jet ports for each raw material liquid toward the through-hole of the head body, and has a rod-shaped valve body that is fitted into the through-hole so as to be able to reciprocate. It has a configuration in which a throttle valve part is formed at the tip. Therefore, the nozzle and the flow rate adjustment valve disposed in the nozzle, which were conventionally required in the mixing head, are no longer necessary, and the number of parts of the mixing head is reduced.
The structure is simplified and assembly is facilitated. Further, since the orifice of the spout or the throttle valve section is opened wide in advance and is shielded to a predetermined opening amount by the peripheral edge of the throttle valve section or the spout, clogging of the raw material is unlikely to occur. Even if a blockage occurs, if the throttle valve part is protruded to the outside of the head body as shown in Figure 1, there is no need to disassemble the mixing head to clean it and remove it, which saves maintenance time. Furthermore, since the ejection length of each raw material liquid is adjusted by rotating the throttle valve portion in the circumferential direction or the axial direction, there is an effect that the occurrence of backlash etc. is reduced and an accurate mixing ratio can be maintained.

[Brief explanation of drawings]

The figure shows the configuration of the mixing head. FIG. 1 is a half-sectional view showing a state in which the rod-shaped valve body 51 is at the front dead center in a mixing head according to a first embodiment of the present invention, and FIG. 2 is a schematic perspective view showing a circulation flow path for liquids A and B. , FIG. 3 is a cross-sectional view taken along the arrow line ■-■ in FIG. 1 showing the switching plunger 41, and FIG.
5 is a side view of the rod-shaped valve body 51, FIG. 6 is a sectional view taken along the line ■-■ in FIG. 5, and FIG. 7 is a perspective view showing the aperture wall 65. FIG. 8 is a half-sectional view of the mixing head 21 showing a state in which the rod-shaped valve body 51 is at the after dead center, and FIG. 9 is an IX-I in FIG. 8 showing the ejection lower 1.73
10 is a sectional view taken along the line X--X in FIG. 1, and FIG. 11 is a perspective view of a throttle valve section applied to the mixing head of the second embodiment. Fig. 12 is a cross-sectional view showing the ejection port when the throttle valve part of the second embodiment is used, and Figs. 13 to 15 are perspective views showing the throttle valve part applied to the mixing head of the third embodiment. FIGS. 16 and 17 are cross-sectional views showing the configuration of a conventional mixing head. 21... Mixing head, 23... Head body. 25... Through hole, 28... Spout outlet. 32... spout. 41... Forest valve body, 65.66.81.87.91... Throttle valve part. -VriCo to -ku C'J~NC%l grieving ω 5th wI Figure 6! :17 Figure 7 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 ! Xi Figure 16 Figure 17

Claims (1)

[Claims] The head main body is formed with a through hole, and is provided with a spout port for each raw material liquid that opens on the side wall of the through hole, and a rod-shaped valve body is fitted into the through hole so as to be able to reciprocate. When the valve body is located at the front dead center, each of the raw material liquids is circulated between the raw material tanks, and when the rod-shaped valve body is located at the back dead center, the raw material liquids are collided and mixed to form the rod-shaped 1. A mixing head configured to eject fluid in the forward axial direction of the valve body, wherein a throttle valve portion capable of adjusting the opening amount of each of the jet ports is formed at the tip of the rod-shaped valve body.