JPS6259653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for injecting a fluid material such as a resin using a casting machine or the like.

Conventionally, for example, resin casting machines have various gate valves for controlling casting and runner-less, and these include gate valves that open and close using thermal expansion such as bimetals, and gate valves that use springs and injection resin. It is known that the spring is pushed up by the injection pressure while balancing with the pressure of the injection pressure. However, these casting machines are not suitable for pouring highly viscous liquids and have the drawback of limited flow rate. In addition, there are some models in which the valve is directly driven by a hydraulic cylinder, but there are problems such as installing a direct drive part in the mold and leakage of resin from the upper mold and rod, and it is also large. There were also restrictions on where it could be used.

The purpose of the present invention is to be able to interrupt and control the flow of fluid materials such as resins, especially thermoplastic resins, and those with high viscosity, such as resins with a viscosity of 100,000 poise or more even at high temperatures, without any problem, and to have no particular restriction on the flow rate. Furthermore, in addition to the above, it is an object of the present invention to provide a fluid material injection device that is simple and can be downsized and can be adopted even in a limited small space.

This object of the present invention is achieved by the following configuration. That is, in the fluid material injection device of the present invention, a valve body that is operated by the flow pressure of the fluid material and opens and closes the fluid material injection port is slidably installed in a cylinder equipped with a fluid material injection port. At the same time, a space in the cylinder is defined through this valve body, and two fluid material passage ports provided in the nozzle gate are connected to each space defined by the valve body. Between the two fluid material passage ports and the pressurized feeder for supplying the fluid material, an inlet pipe connected to the pressurized feeder and an outlet pipe for discharging the fluid material are connected, and A directional switching valve is provided which is connected to the fluid material passage port and switches the fluid material passage port such that when one of the fluid material passage ports is connected to the inlet pipe, the other is connected to the discharge pipe. It is something.

The fluid materials used in carrying out the present invention include materials that can flow at room temperature or under heating, and examples include thermoplastic resins, thermosetting resins, etc., depending on the purpose, and non-reactive materials are particularly advantageous. used for.

Next, the specific content of the present invention will be explained with reference to the drawings.

The drawings illustrate the fluid material injection device of the present invention, and show the cross section of the nozzle gate part and the system flow of other parts.

In the figure, the fluid material injection device includes a nozzle gate section 1 and a directional switching valve 22 located outside the mold system.
The functions are broadly divided into the pressurized feeder 28 and the pressurized feeder 28.

These contents will be described below in order.

First, the main nozzle gate part 1 consists of a cylinder 4 that slidably accommodates a valve body 3 in a nozzle body 2, two fluid material passages 5 and 6, and a valve body 3 and a cylinder 4 in the cylinder 4. It basically consists of a seal plug 7 that seals one side. The cylinder 4 is provided with fluid material passage ports 8 and 9 and a fluid material inlet 10 through which the fluid material passages 5 and 6 open into the cylinder 4, respectively. Further, the main body of the valve body 3 in the cylinder 4 is equipped with a packing 11 such as an O-ring to make it liquid-tight, and has a rod 12 corresponding to the fluid material injection port 10 to open and close it. ing. Further, the valve body 3 has space parts 13 and 14 formed by dividing the cylinder 4 into two parts, and has a mechanism in which the valve body 3 can slide when a fluid material flows into or passes through the space parts 13 or 14.

This nozzle gate part 1 is fitted into an upper mold 15 and has a spacer 16 attached thereto, which becomes the upper surface of the press. At this time, when a thermoplastic resin is used as the fluid material, a heater 17 is inserted.

A lower mold 19 having a mold space 18 is opened below the upper mold 15 and arranged so that the mold space 18 coincides with the fluid material injection port 10 .

On the other hand, piping 2 extending from the fluid material passages 5 and 6
0 and 21 are connected to the directional switching valve 22. Here, the pipes 20 and 21 are connected to the flange 2 through the packing 23.
4, it is fixed to the nozzle gate main body 2.

The directional switching valve 22 has a valve portion 25 inside, which switches the flow of the fluid material in the direction of the solid line arrow or the dotted line arrow by external mechanical rotation or the like. A flow material discharge port pipe 26 and an inlet pipe 27 are attached to the directional switching valve 22, and a pump and a pump are attached to the inlet pipe 27.
A pressurized feeder 28 such as an extruder for feeding the fluid material is connected.

Next, the procedure for operating the apparatus of the present invention will be described.

First, when the valve portion 25 of the directional control valve 22 is turned in the direction of the solid line arrow to cause the fluid material to flow from the pressurized feeder 28, the fluid material is sent to the space 13 via the piping 20 and the nozzle 5. The pressure at this time moves the valve body 3 to close the fluid material inlet 10. Next, when the valve part 25 is switched in the direction of the dotted line and the fluid material is allowed to flow into the space 14 through the piping 21 and the fluid material passage 6, the valve body 3 moves to its original direction, that is, toward the seal plug 7 side due to pressurization, and the fluid material flows. The material injection port 10 is opened, and the fluid material is injected and filled into the mold space 18 of the lower mold 19. At this time, the fluid material fed into the first space 13 returns through the fluid material passage 5 and the piping 20 by moving the valve body 3, and is discharged from the directional control valve 22 through the discharge port piping 26. Although not shown, the discharged fluid material can be returned to the pressurized feeder 28 again. Next, when the mold space 18 is filled with the fluid material, the valve portion 25 is switched again in the direction of the solid line and the operation is continued in the same manner.

Pressurized feeder 28 used in carrying out the present invention
A high-pressure pump, screw extruder, or the like is preferably used, but other systems may be used as long as they can feed the fluid material under pressure. Further, the direction switching valve 22 may be any valve having a function of switching the direction of the flowing material, and may be one using a piston cylinder, a diaphragm, etc. other than the one shown in the drawing.

Also, a part of the fluid material that has entered the space 13 will not come out forever if the gasket 11 of the valve body 3 is intact, so if this is inconvenient, for example, the gasket 11 may be removed and the valve body inside the cylinder 4 can be removed. 3, or provide a small through hole in the valve body 3 that connects the spaces 13 and 14 so that a small amount of fluid material can leak through the pipes 20 and 21.
It is also possible to allow the flow to flow through the gap.

Further, the fluid material from the outlet pipe 26 can be returned to the pressurized feeder 28 as described above, for example, to the pump reservoir in the case of a pump, or to the hopper port after cooling in the case of a screw extruder. can be,
Therefore, the present invention is particularly useful for injection of non-reactive flowable materials.

In the present invention, the directional control valve part and the nozzle gate part, which is the gate valve part, are separated, and the fluid material itself for casting can be used as the working fluid to operate the valve body in the cylinder. Can be downsized for the flow rate of fluid material,
Moreover, the structure can be simplified. Second, there are no sliding parts that could cause fluid material to leak in the nozzle gate, so maintainability is good, and third, since the fluid material that is the working fluid also serves as the fluid material for casting, it is possible to No material can enter. Fourthly, you can freely select the moving distance of the valve body in the nozzle gate.
The degree of freedom in its design can be increased, and in addition, since the tip of the valve body has a so-called self-cleaning function, it has the advantage that it can be used for fluid materials that can cause nozzle clogging, such as in the case of painting. Further, the injection device of the present invention is a one-liquid type injection device, and discharges the fluid material into each partitioned space to gradually operate the valve body.
Since the fluid material inlet is opened and closed gradually rather than abruptly, when applying a butyl-based rubber adhesive as a fluid material to a glass surface, etc., the fluid material is suddenly discharged onto the glass surface and Another advantage is that the adhesive can be applied safely without damaging or damaging the surface. Furthermore, in the case of the present invention, the valve body of the fluid material injection device is incorporated into the upper mold, and the fluid material is directly injected from the fluid material injection port into the mold space of the lower mold, so that when the mold is opened, The liquid drains easily, so there is no fear that a part of the fluid material will remain connected to the fluid material injected into the mold space, and workability can be improved.

[Brief explanation of the drawing]

The drawing is a system flow diagram including a partially enlarged cross-sectional view illustrating the fluid material injection device of the present invention. 1... Nozzle gate section, 2... Nozzle gate body, 3... Valve body, 4... Cylinder, 5, 6...
Fluid material passage, 7... Seal plug, 8, 9... Fluid material passage port, 10... Fluid material inlet, 11... Packing, 12... Rod, 13, 14... Space portion,
15...Top mold, 16...Spacer, 17
... Heater, 18 ... Mold space, 19 ... Lower mold, 20, 21 ... Piping, 22 ... Directional switching valve, 23 ... Packing, 24 ... Flange, 25
... Valve section, 26 ... Discharge port piping, 27 ... Inlet pipe, 28 ... Pressurized supply machine.

Claims (1)

[Claims] 1 A valve body that is operated by the fluid pressure of the fluid material and opens and closes the fluid material inlet is slidably installed in a cylinder equipped with a fluid material inlet, and a valve body that opens and closes the fluid material inlet is slidably installed inside the cylinder. The space is divided into sections,
A pressurized feeder that connects two fluid material passage ports provided in the nozzle gate to each space divided by the valve body, and supplies the two fluid material passage ports and the fluid material. An inlet pipe connected to a pressurized feeder and a discharge port pipe for discharging the fluid material are connected between the A fluid material injection device characterized in that a directional switching valve is provided that switches one side of the inlet pipe so that when the other side is connected to the outlet pipe, the other side is connected to the outlet pipe.