JP2516692Y2 - As-cast removal device of degassing device in injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an as-cast removal device for a gas venting device in an injection molding machine such as a die casting.

[Prior Art] An injection molding machine used in an injection molding method such as die casting employs a degassing device for discharging gas in a cavity to the outside in order to prevent generation of cavities in a product. This degassing device has a degassing passage, an on-off valve disposed in the degassing passage for preventing the molten metal from scattering from the exhaust line to the outside of the mold, and a drive means for driving this on-off valve. ing.

As-cast due to the molten material to be injected is likely to adhere to the valve seat and the valve taper portion of the on-off valve. If this is left unattended, the seal of the on-off valve will be incomplete, and the melt to be injected will flow into the on-off valve during die casting, and the intended purpose of the degassing device will not be achieved.

For this reason, the degassing device is provided with a removing device that removes the cast ashes adhering near the on-off valve.

As an as-casting removing device in such a gas venting device, one disclosed in a patent application filed on July 20, 1990 by the same applicant, Japanese Utility Model Publication No. 59-12121, and Japanese Patent Application Laid-Open No. 61-20655. Those disclosed in Japanese Laid-Open Publications and the like are listed.

[Problems to be Solved by the Invention] In the above-described conventional as-casting removal device, a fluid is supplied from the cleaning fluid supply means into the degassing device to eliminate the as-casting. A supply path for supplying this fluid into the degassing device is connected to an exhaust line. Therefore,
The exhaust line and the fluid supply passage merge to form a single line (common line), which is connected to the gas vent passage.

However, since a vacuum pump or the like for depressurizing the inside of the mold at the time of injecting the injection object of the injection molding machine is connected to this exhaust line, as-cast etc. is sucked into the exhaust line during suction by the vacuum pump or the like. The Rukoto. Among the sucked as-cast materials, the as-cast materials that have been sucked into the common line flow back to the degassing device side when the fluid is supplied, and the as-cast materials reattach to the valve seat and the like. there were.
As a result, the seal becomes incomplete when the valve is closed, which may cause problems such as malfunction of the valve due to molten metal entering the valve during the die casting work.

The present invention has been made in view of the above-mentioned problems, and as-cast metal etc. once removed from the valve seat, valve taper portion, etc. of the on-off valve may be re-adhered to these portions again during the cleaning process. It is an object of the present invention to provide an as-cast removal device for a degassing device.

[Means for Solving the Problems] In order to achieve the above object, the present invention is provided with a gas vent passage that is provided from a cavity of a mold and a suction means that discharges gas in the cavity out of the mold. Exhaust line,
A non-casting removal device for a degassing device in an injection molding machine, comprising: a fluid passage to which a cleaning fluid supply means is connected; wherein the exhaust line and the fluid passage are independently connected to the degassing passage. And an angle between an exhaust line and a fluid passage at a connection portion with the gas vent passage is 30 ° to 45 °, an as-cast removal device for a gas vent device in an injection molding machine is provided. It is a thing.

[Operation] According to the present invention having the above configuration, the fluid supply means and the suction means are independently connected to the gas vent passage. Therefore, unlike the as-cast removal device in the conventional gas venting device in which the fluid supply passage is connected to the gas vent passage through the exhaust line connected to the suction means, it is sucked into the exhaust line during suction by a vacuum pump or the like. In addition, the as-cast metal or the like rides on the flow of the fluid from the fluid supply means and does not flow into the degassing device.

Furthermore, since the fluid passage forms a predetermined angle with respect to the suction direction of the exhaust line, when casting from the exhaust line, as-cast or the like is not sucked into the adjacent fluid passage.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

 First, the degassing device is configured as follows.

As shown in FIG. 1, a degassing passage 5 communicating with the cavity 4 is provided in the dividing surface portion 3 of the fixed mold 1 and the movable mold 2.

The degassing passage 5 has a gate 6 with respect to the cavity 4.
The vacuum suction device 7 and the cleaning means 24 are connected to each other on the opposite side as shown in the figure. The vacuum suction device 7 sucks the gas in the cavity 4 at the time of injection so that the gas can be discharged to the outside of the mold.
A fluid is supplied to remove as-cast material.

The vacuum suction device 7 includes an electromagnetic valve 7a, a tank 7b, a vacuum pump 7c, a motor 7d, an exhaust line 7e, and a filter 7f.

Further, the cleaning means 24 is a solenoid valve 24 for supplying a cleaning fluid.
a, a fluid source 24b, and a fluid passage 24c.

Unlike the prior art, the vacuum suction means 7 and the cleaning means 24 are, as shown in FIG. 1, directly connected to the outer end portion 5 of the degassing passage 5 via the independent exhaust line 7e and fluid passage 24c.
It is connected to a.

In the connecting portion, the exhaust line 7e and the fluid passage 24c
And are arranged at an angle of 30 ° to 45 °.

Connect the exhaust line 7e and the fluid passage 24c to the outer end 5 of the gas vent passage 5.
As a method of connecting to a, for example, there is a method of using a connecting member 25 as shown in FIG. In this case, the male screw portion 25c provided at the lower end of the connecting member 25 is connected to the gas vent passage 5
The connecting member 25 is connected to the exhaust line outer end 5a by screwing the exhaust line 7e into the exhaust line connecting port.
The fluid passages 24c are connected to the fluid connection ports 25b at 25a. As a result, the exhaust line 7e is connected to the outer end portion 5a of the gas vent passage 5 on substantially the same straight line. In this connection method, it is possible to arrange the common line to the extent that the purpose of the present invention is not impaired.

Further, an opening / closing valve 8 for opening / closing the gas vent passage 5 is provided at the outer end portion 5a of the gas vent passage 5, and a conductive material to be injected is melted in the middle of the gas vent passage 5. A detection rod 9 made of a conductive material for detecting (molten metal) is provided.

The detection rod 9 and the valve drive mechanism 11 are electrically connected to each other via a control unit 10 that is configured to operate when the melt to be injected comes into contact with the detection rod 9.

The valve drive mechanism 11 comprises valve switching means 11a and valve operating means, and the valve operating means comprises a valve operating cylinder 12, a piston 13 having a movable valve 8a, and a compressor 17. The valve switching means 11a comprises solenoid valves 14 and 15 and an air operated valve 16.

Further, the opening / closing valve 8 has a valve hole 8c having a tapered valve seat 8d provided near the outer end portion 5a of the gas vent passage 5.
A piston rod 13a and a movable valve 8a with a tapered surface 8b attached to the tip of the piston rod 13a are fitted by a piston 13 so as to reciprocate in the axial direction.
The compressed air is supplied to the piston front chamber 12a of 12 through the air actuated valve 16 of the valve switching means 11a, and at the same time, the compressed air is discharged from the piston rear chamber 12b to the atmosphere, whereby the piston 13 moves backward ( (To the right in FIG. 1), the taper surface 8b of the movable valve 8a is seated on the valve seat 8d to be closed, so that the gas vent passage 5 is closed, and vice versa. At the same time as compressed air is supplied to 12b through the air actuated valve 16, the piston front chamber 12
When the compressed air is discharged from the a into the atmosphere, the piston 13 advances, the movable valve 8a is opened apart from the valve seat 8d, and the gas vent passage 5 is opened.

Further, a casting sleeve 19 having a pouring port 19a communicating with the runner 18 is fixed to the fixed mold 1, and a plunger 21 is advanced by an injection cylinder 20 to inject the pouring sleeve 19 into the casting sleeve 19 from the pouring port 19a. Runner for injection melt 1
8, the cavity 4 is filled through the gate 6.

In this embodiment, after the plunger 21 blocks the pouring port 19a, the striker 22 operates the vacuum start limit switch 23, and the casting machine controller 26 operates the solenoid valve 7a of the vacuum suction device 7 to perform casting. The gas in the sleeve 19 and the cavity 4 is discharged from the gas vent passage 5 to the outside of the mold. At this time, the gas in the cavity 4 is sucked toward the vacuum pump 7 through the exhaust line 7e connected to the outer end portion of the gas vent passage 5, and solid matters such as as-cast contained in the gas are in the middle of the exhaust line 7e. Will be collected by the filter 7f provided in the. Further, the connecting portion of the exhaust line 7e with the outer end portion of the gas vent passage 5 and the connecting portion of the fluid passage 24c with the outer end portion of the gas vent passage 5 are at 30 ° as described above.
They are arranged at an angle of ~ 45 °. For this reason, the as-cast cast metal sucked in the exhaust line 7e direction does not flow into the fluid passage 24c due to the suction force generated in the exhaust line direction.

The reason why the angle is set to 30 ° to 45 ° as described above will be described in detail below. That is, if the angle is smaller than 30 °, as-cast metal or the like easily flows into the fluid passage 24c. on the other hand,
If the angle is larger than 45 °, the direction in which the fluid is blown toward the degassing device is greatly deviated, so that the efficiency of removing as-cast material is reduced. Therefore, as-cast, etc. are
The angle that does not flow into c and does not impair the efficiency of as-cast removal is in the range of 30 ° to 45 °.

Next, the as-cast removal device of the above-mentioned degassing device will be described.

According to the present invention, after the molded product is taken out, the valve switching means 11a of the valve drive mechanism 11 in the above-mentioned degassing device is alternately turned on and off a plurality of times, whereby the on-off valve 8 is repeatedly opened and closed. Further, the cleaning fluid is intermittently or continuously sprayed into the opening / closing valve 8 during the repeated opening / closing operations.

More specifically, as shown in FIG.
The cleaning fluid can be supplied from the outer end portion 5a of the solenoid valve 5 to the on-off valve 8 under pressure, and the cleaning fluid source 24b is connected to the solenoid valve 24 in the gas vent passage 5.
and a fluid passage 24c.

Further, the pair of solenoid valves 14 and 15 are arranged so that the opening / closing operation of the movable valve 8a in the opening / closing valve 8 is repeated several times at a constant time interval.
Are provided.

That is, the solenoid valves 14 and 15 are turned on by the operation of the control unit 10.
It is set so as to repeat N and OFF, whereby the movable valve 8a is repeatedly opened and closed. A mechanical impact force due to a collision when the movable valve 8a is seated on the valve seat 8d is applied to the movable valve 8a in the on-off valve 8 and the cast as-deposited not shown attached to the valve seat 8d, and the cast as-is is applied to the movable valve 8a It is designed to be peeled off from 8d etc. and removed. As the control unit 10,
A sequence circuit, a logic circuit, etc. can be used.

The control unit 10 is connected to the casting control unit 26, and also the control unit 10
Is connected to electromagnetic valves 14 and 15 for opening and closing the on-off valve 8 and an electromagnetic valve 24a for cleaning fluid. That is, a signal from the casting machine control unit 26, such as a release agent spray start signal or an air blow start signal, can be supplied to the control unit 10, and the control unit 10 turns on the valve switching means based on the signal.
-Generate OFF drive signal. That is, the solenoid valves 14 and 15 are turned on and off to repeatedly open and close the on-off valve 8. Further, the control unit 10 generates a cleaning fluid drive signal in response to the signal from the casting control unit 26. That is, the ON / OFF start signal of the cleaning fluid supply solenoid valve 24a is output from the control unit 10 to the solenoid valve 24a. Simultaneously with the removal and removal of the as-cast material, the solenoid valve 24a is turned on, and the cleaning fluid is supplied (sprayed) from the fluid source 24b into the on-off valve 8 through the fluid passage 24c.

Further, in the casting machine control unit 26, an ON / OFF signal generation circuit for the solenoid valves 14 and 15 and an ON / OFF signal generation circuit for the solenoid valve 24a are incorporated, and an electronic circuit such as an IC circuit may be used as the control unit 10. Good.

The control unit 10 operates to output a voltage that is several times the rated voltage to the solenoid valve 14 for a short time, and the solenoid valve 14 operates so that compressed air passes through the port (a) of the solenoid valve 14 and the air operated valve 16 Is supplied to the pilot 16a of the valve actuating valve 16, the compressed air is supplied to the piston front chamber 12a of the valve operating cylinder 12 through the port (b), and at the same time the compressed air in the piston rear chamber 12b is operated to the port. It is released into the atmosphere through (c) and the on-off valve 9 is closed. Note that the closing operation of the on-off valve 8 for preventing the molten metal from passing through the on-off valve 8 is also performed by this series of operations, but the detection signal from the detection rod 9 is used as the signal to start closing the valve. Sent to the solenoid valve based on the signal
The only difference is that 14 and 15 are activated.

Regarding the valve opening operation, the control unit 10 operates to output the rated voltage to the solenoid valve 15 for a short time, the solenoid valve 15 operates, and compressed air causes the port (d) of the solenoid valve 15 to operate. After that, it is supplied to the pilot 16b of the air operated valve, the air operated valve 16 operates, and compressed air is supplied to the piston rear chamber 12b of the valve operating cylinder 12 through the port (e), and at the same time, in the piston front chamber 12a. Compressed air is released into the atmosphere through the port (f).

Further, the both solenoid valves 14 and 15 are alternately turned on and off repeatedly, and at the same time, the solenoid valve 24a is turned on and off intermittently several times to spray cleaning fluid into the on-off valve 8. As a result, the as-cast ashes and solids that have peeled off are removed, but it is also possible to carry out the ON operation continuously.

Then, after the molded product is taken out, a start signal for spraying the release material or a start signal for air blow is issued from the casting control unit 26, and the signal is sent to the control unit 10.
Based on this signal, the solenoid valves 14 and 15 of the valve switching means alternately repeat ON and OFF operations, whereby the movable valve 8a of the opening / closing valve 8 repeats opening / closing operations several times in a short time. As a result, the cast ashes adhering to the movable valve 8a and the valve seat 8d are separated from them by mechanical impact.

Simultaneously with this as-cast peeling removal operation, the cleaning fluid supply solenoid valve from the control unit 10 based on the start signal.
A drive signal is sent to 24a, and this solenoid valve 24a is also repeatedly turned on and off, or maintained in the on state, and as a result, the cleaning fluid is intermittently or continuously supplied into the on-off valve 8. As a result, as-cast and other solids that have separated from the movable valve 8a, the valve seat 8d, etc. are removed and discharged outside the mold by this fluid.

The above-described embodiment is an application of the present invention to a degassing device having a function of operating an on-off valve after removing a molded product to remove as-cast metal, but the present invention is not limited to this, The present invention can be applied to the degassing device in all injection molding machines in which the suction means for exhausting gas and the fluid supply means for cleaning are connected.

[Effects] As described above, according to the above-described embodiment, the exhaust line connected to the vacuum pump or the like for degassing the inside of the mold at the time of injection and the fluid passage for supplying the fluid at the time of cleaning to remove the as-cast material are provided. It is independently connected to the outer end of the vent passage.

For this reason, the as-cast metal and the like sucked into the exhaust line at the time of suction by the vacuum pump is extremely unlikely to flow back toward the degassing device when cleaning the degassing device with a fluid. As a result, it is extremely unlikely that once cast, etc. will be reattached to the valve seat and the valve taper portion of the degassing device, resulting in valve seal failure.

Further, the angle between the exhaust line and the fluid passage at the portion connected to the gas vent passage is 30 ° to 45 °.

For this reason, as-cast and the like do not enter the adjacent fluid passage during suction by the vacuum pump, and as-cast and the like flow out from the fluid passage during fluid degassing device cleaning, and these are Does not reattach to the valve seat, valve seal, etc. Furthermore, the efficiency of removing as-cast material during cleaning with fluid does not decrease.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an as-casting removal device of a degassing device in an injection molding machine according to the present invention, and FIG. 2 shows a connecting member for connecting an exhaust line and a fluid passage to the degassing line. FIG. In the figure, 5 ... Gas vent passage, 7 ... Suction device, 7e ... Exhaust line, 8 ... Gas venting opening / closing valve, 24 ... Cleaning fluid supply device, 25 ... Connection member, 24b ... Fluid Source, 24c ... fluid path.

Continuation of the front page (56) Reference JP-A-3-174967 (JP, A) Actually opened 59-34853 (JP, U) Actually opened 58-194855 (JP, U) JP-B-3-55286 (JP , B2)

Claims (1)

(57) [Scope of utility model registration request] 1. A gas vent passage extending from a mold cavity, an exhaust line connected to a suction means for discharging the gas in the cavity out of the mold, and a fluid passage connected to a cleaning fluid supply means. An as-casting removal device of a degassing device in an injection molding machine, comprising: the exhaust line and the fluid passage independently connected to the degassing passage, and a connecting portion with the degassing passage. The as-cast removal device for a degassing device in an injection molding machine, characterized in that an angle formed by the exhaust line and the fluid passage in is 30 ° to 45 °.