JPH0620031U - Rotary taper check valve - Google Patents

Abstract

(57) [Summary] [Object] The present invention can enhance the sealing property of the molding material by slightly raising the rotary taper check valve that blocks or communicates the molding material transfer passage. The purpose is to prevent galling by slightly lowering the tapered rod. [Structure] A vertical hole 1101 formed substantially in the center of a housing 11 and left / right lateral holes 1102, 1103 intersecting the vertical hole 1101 at right angles are provided with left / right side walls 1104, 1.
105, which are formed on the left and right lateral holes 1102, 1
In the rotary taper check valve 10 in which the tapered rod 12 in which the communication hole 1203 is formed so as to communicate with 103 is rotatably fitted in the vertical hole 1101 and is movable in the up and down directions. is there.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary taper check valve that blocks or communicates a molding material transfer passage.

[0002]

[Prior art]

 A direct check plate or rotary check valve is provided in the transfer passage formed between the vent type screw pushing side and the injection plunger pot side. However, since the direct check plate has a simple structure, it is easy to manufacture and install.However, there is a leakage at the time of extruding the molding material from the screw or a leakage at the time of injection pressure, that is, a backing at the time of injection from the injection plunger to the mold. There are problems of resin sealing such as flow and galling of the rotary check valve.

[0003]

[Problems to be solved by the device]

 Therefore, in order to eliminate the above-mentioned drawbacks, the structure of the rotary taper check valve formed between the outlet on the vent type screw pushing side and the inlet on the injection plunger side should be simplified, and at the same time the resin sealing property should be improved. The technical issue of the present invention is what kind of structure should be used to increase the height.

[0004]

[Means for Solving the Problems]

 Means for solving the above technical problems are as follows. That is, the rotary taper check valve is composed of a housing and a tapered rod, and the housing has a tapered vertical hole formed at the substantially center thereof, and horizontal horizontal holes orthogonal to the vertical hole are formed on the left and right side walls. And a generally frusto-conical rod that is rotatably fitted in the tapered vertical hole of the housing is provided with a communication hole that matches the lateral hole.

[0005]

[Action]

 The rotary taper check valve formed between the outlet on the vent type screw push-out side and the inlet on the injection plunger pot side matches the lateral holes on both sides, and when hydraulic pressure is supplied to the cylinder, the taper rod is released. It rises slightly.

As a result, the outer periphery of the tapered rod and the sliding portion of the inner peripheral surface of the housing come into close contact with each other, the gap between the two is eliminated, and leakage of the molding material can be prevented. Next, before the injection plunger pot side is switched to the injection process, air pressure or hydraulic pressure is supplied to the other side of the cylinder to slightly lower the tapered rod, thereby providing a clearance to the sliding portion and driving device. To rotate the tapered rod.

With this, the transfer of the molding material can be momentarily interrupted, and at the same time, the taper rod is slightly raised by supplying air pressure or pressurized oil to one side so that the molding material does not backflow to the screw side. It is possible to prevent the molding material from leaking into the gap between the sliding parts.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic view of a vacuum injection molding machine incorporating a rotary taper check valve of the present invention.

FIG. 2 is a partially omitted vertical front view showing a state where the rotary taper check valve of the present invention is measuring. FIG. 3 is a partially omitted vertical front view showing the state of the rotary taper check valve of the present invention at the time of injection. FIG. 4 is a side view of a driving device for rotating the tapered rod of the rotary taper check valve of the present invention.

The rotary taper check valve 10 is formed, for example, between the vent type screw pushing side and the ejection plunger pot side, and is composed of a housing 11 and a tapered rod 12.

The housing 11 has a tapered vertical hole 1101 formed substantially at the center thereof, and horizontal left and right horizontal holes 1102 and 1103 intersecting the tapered vertical hole 1101 at right angles, that is, right and left, are left and right. Are formed on the side walls 1104 and 1105.

The tapered rod 12 is integrally formed between an upper shaft 1201 and a lower shaft 1202 that are rotatably fitted in a tapered vertical hole 1101 of the housing 11, and the left and right sides of the housing 11 are formed. A communication hole 1203 is formed to match the horizontal holes 1102 and 1103 formed on the wall.

After inserting the slide bearing 1204, the upper shaft 1201 is rotatably held on the upper end surface 1106 of the housing by screwing a double nut 1205.

A hydraulic cylinder 13 is attached to the lower shaft 1202 so as to surround the flange 1206 of the lower shaft 1202 in order to move the tapered rod 12 upward or downward, and the hydraulic cylinders 13 are provided above and below the flange 1206. An inlet 1303 having a groove having a substantially U-shaped cross section formed on the inner peripheral surface so as to form the annular hydraulic passages 1301 and 1302 on the side, and supplying and discharging the pressurized fluid to and from the annular hydraulic passages 1301 and 1302. And 1304 are formed on the outer circumference of the hydraulic cylinder 13.

The inlets 1303 and 1304 are connected to a separately provided electromagnetic type directional control valve 1407 via a pipe (not shown). Reference numeral 1207 denotes a rectangular locking member formed at the lower end of the lower shaft 1202. One end of a link member 1401 on the rotary drive unit 14 side is attached to the rectangular locking member 1207, and the other end is the tip of a piston rod 1402. It is rotatably attached to the engaging member 1403 provided on the plate via a pin 1404.

A pressure cylinder 1405 for moving the piston rod 1402 forward or backward is rotatably attached to a plate 1406 attached to the vent type screw pushing side or the injection plunger pot side.

In the drawings, reference numeral 100 is a vent type screw pushing device, which has a plasticizing heating cylinder 101, a screw 102, and a screw rotating device 106, and a molding material is provided at the tip of the heating cylinder 101. An outflow port (not shown) is formed, and a hopper 104 is provided on the rear side. Reference numerals 105 and 209 are hot water passages.

Reference numeral 200 denotes a plunger-type injection device, which has a heating cylinder 201 and a nozzle portion 202 at its tip, and rises in an injection plunger pot 206 integrally with the heating cylinder 201. The descending injection plunger 203 is fitted.

Reference numeral 205 is an inflow port, 207 is a vacuum pump, 208 is a switching valve, 210 is a ram, 214 is a degassing lateral hole, 211 and 212 are pressurized fluid supply / discharge pipes, and 300 is a mold. 1208 and 1305 are oil seals.

[0020]

[Effect of device]

 First, when the pressurized fluid is supplied to the inlet 1304 of the cylinder 13 in FIG. 2, the tapered rod 12 is slightly lifted via the flange 1206 of the lower shaft 1202, so that there is no gap in the sliding portion. In addition, it is possible to prevent the molding material from leaking during the measurement, and at the same time prevent the sliding portion from being scratched.

Next, when a pressurized fluid is supplied to the injection port 1303 of the cylinder 13 before the injection plunger pot side is switched to the injection process, the tapered rod 12 is lowered to be slightly floated. Therefore, a slight gap is formed between the outer peripheral surface of the tapered rod 12 and the inner peripheral surface of the housing, and in this state, the pressurized fluid is supplied to the cylinder 1405 of the drive device 14, whereby the piston rod At the same time as 1402 moves forward, the engaging member 1403 of the lower shaft 1202 is easily rotated, and at the same time, the position of the communication hole 1203 is displaced, and subsequently, a pressurized fluid is supplied to the inlet 1304 to cause the sliding portion. This eliminates the gap between the two and prevents leakage of molding material.

In short, the taper rod of the rotary taper check valve is slightly lowered in the housing to be slightly floated.

When the tapered rod is rotated in this state, the transfer of the molding material, that is, the inflow of the screw from the outlet of the screw to the inlet of the plunger pot can be smoothly blocked. The sliding part will come into close contact with the mold by slightly raising it, and there will be no backflow of the molding material to the screw side even during injection into the mold following metering of the molding material by the operation of the injection plunger. It has a special effect of.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a vacuum injection molding machine incorporating a rotary taper check valve of the present invention.

FIG. 2 is a partially omitted vertical sectional front view showing a state where the rotary taper check valve of the present invention is measuring.

FIG. 3 is a partially omitted vertical sectional front view showing a state where the rotary taper check valve of the present invention is injecting.

FIG. 4 is a side view of a driving device for rotating the tapered rod of the rotary taper check valve of the present invention.

[Explanation of symbols]

 10: Rotary taper check valve 11: Housing 12: Tapered rod 13: Hydraulic cylinder 1101: Tapered vertical hole 1102, 1103: Left / right lateral hole 1104, 1105: Left / right side wall 1201, 1202: Upper / lower shaft 1203: Communication hole 1206: Flange

Claims (2)

[Scope of utility model registration request] 1. A rotary taper check valve is composed of a housing and a tapered rod, wherein the housing has a tapered vertical hole formed substantially at the center thereof and a horizontal horizontal hole orthogonal to the tapered vertical hole. Is formed on the left and right side walls, and a substantially frustoconical tapered rod that is rotatably fitted in a tapered vertical hole of the housing is integrally formed between the upper and lower shafts, A rotary taper check valve, wherein the tapered rod is formed with a communication hole that matches the lateral hole. 2. A male screw is formed on one of the upper and lower shafts having a substantially frustoconical tapered rod that is fitted into the housing, and a flange is formed on the other, and the flange is a pressure cylinder. The rotary taper check valve according to claim 1, wherein the rotary taper check valve is fitted to the.