JPH08294745A - Mold release agent injecting device - Google Patents

Abstract

PURPOSE: To prevent separation of a releasing agent from diluting liquid in a releasing agent storage tank, and to prevent the clogging of an injection nozzle and the settling and solidification of the releasing agent in a releasing agent feed piping. CONSTITUTION: A storage tank 21 to store the releasing agent is connected to a mixing and injection part 28 through a first feed tube 32, a switching solenoid valve 24, and a second feed tube 33 capable of connecting to a compressed air feed tube 40. The switching solenoid valve 24 is connected to a storage tank 21 through a first circulating piping 34, a pump 25, and a second circulating piping 35. When the switching solenoid valve 24 is at the first switching position 24A, the storage tank is connected to the mixing and injection part. When the solenoid valve 24 is at the second switching position 24B, the releasing agent in the storage tank is returned. The compressed air is fed to the second feed tube 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release agent injection device,
In particular, the present invention relates to a release agent injection device that mixes a release agent and compressed air and injects the release agent into a die of a die casting machine.

[0002]

2. Description of the Related Art In a die casting machine, a mold release agent is spray-applied to a mold after opening the mold for the purpose of promoting mold release of a cast product. Here, in JP-A-62-38751,
The release agent supplied from the release agent storage tank to the mixing injection section through the supply pipe is mixed with the compressed air in the mixing injection section, and is spray-applied to the mold attached to the die casting machine. In the injection device, a release agent injection device that recovers the release agent remaining in the mixing injection unit by compressed air is described.

Specifically, as shown in FIG. 2, a storage tank 1 for storing a release agent and a plurality of release tanks for injecting the release agent onto the surface of a die attached to a die casting machine (not shown). Mixing injection unit 7 provided with an injection nozzle 7a, release agent supply means for supplying a release agent from the storage tank 1 to the mixing injection unit 7, and release agent supply in the mixing injection unit 7. And a first compressed air supply means 9 connected to the mixing injection part for mixing compressed air with the release agent supplied from the means.

The release agent supply means has a supply pipe 6 for connecting the storage tank 1 and the mixing injection section 7, and the supply pipe 6 is a pump for pumping the release agent stored in the storage tank 1. Two
A pressure reducing valve 3, a check valve 4 and a stop valve 5 are provided. The first compressed air supply means 9 is connected to a compressed air source (not shown), and the release agent supplied to the mixing / injection unit 7 is mixed with the compressed air and is sprayed from the spray nozzle 7a. There is.

After the mold release agent is applied to the mold, the mixing and injection section 7
The mixing injection unit 7 is connected to a recovery tank 11 via a recovery pipe 8 in order to recover the residual release agent. An opening is formed in the upper part of the recovery tank 11 to open the compressed air for recovery to the atmosphere. The recovery tank 11 is a check valve 1
It is connected to the pressure tank 12 by a connecting pipe 18 provided with 7. Here, the recovery tank 11 and the pressure tank 12 have the same shape and the same installation position so that the amount of the released release agent collected in the recovery tank 11 and the amount of the release agent stored in the pressure tank are the same. Is equipped with. The pressure tank 12 has a sealed structure and is connected via a solenoid valve 14 to a separately provided compressed air supply means 10. The bottom of the pressure tank 12 is connected to the stop valve 5 of the release agent supply means via the check valve 15. The pressure tank 12 is provided with a level switch 13 for detecting the liquid level in the pressure tank.

The mold release agent pumped up by the pump 2 is mixed with the compressed air in the mixing / injecting section 7, and the injection nozzle 7a.
From the die casting machine onto the surface of the die (not shown). After the injection of the release agent, the recovery tank 11 is compressed by the compressed air supplied from the first compressed air supply means 9.
The release agent is recovered. The compressed air carrying the remaining release agent to the recovery tank 11 is released to the atmosphere through the opening formed in the recovery tank 11. When a certain amount of release agent is accumulated in the recovery tank 11, the check valve 17 is opened and the pressure tank 1
Inflow to 2. The release agent in the pressure tank 12 is monitored by the level switch 13, and after a certain amount of the release agent is accumulated, the compressed air is supplied from the compressed air supply means 10 to the pressure tank 12.
The recovered release agent is supplied to the supply pipe 6 for reuse.

[0007]

However, Japanese Patent Laid-Open No. 62-62
In the invention described in 38751, since the release agent is stagnant in the supply pipe 6, the recovery tank 11, and the pressure tank 12 except for the injection time of the release agent, the recovery tank 11, the pressure tank 12, and the pipeline 6 are Since the release agent and the diluent are separated, the release agent cannot maintain a homogeneous state. Further, when casting a large product having a long shot cycle, the mold release agent may stick to the inside of the supply pipe 6 due to a long stagnation time of the injection time, which may cause clogging of the pipe. Especially when an emulsion type release agent is used, the phenomenon of sticking of the release agent becomes remarkable. When the release agent solidified in the supply pipe 6 is separated from the supply pipe 6 and pressure-fed to the injection nozzle 7a, the injection nozzle is clogged.

Therefore, the present invention prevents the release agent and the diluent from being separated from each other in the release agent storage tank and prevents the release agent from being deposited or solidified in the release agent supply pipe line. It is an object of the present invention to provide a release agent injection device that prevents clogging of the mold.

[0009]

In order to achieve the above object, the present invention provides a storage tank for storing a release agent and an injection of the release agent on the surface of a mold attached to a die casting machine. And a release agent supply means for supplying a release agent from the storage tank to the mix injection portion, and the release agent compressed by the release agent supply means in the mix injection portion. In a mold release agent injection device having a first compressed air supply means connected to the mixing injection part for mixing air, one end of the mold release agent is communicated with the storage tank 21 The first pressure-feeding in the direction of the mixed injection unit 28
Supply conduit means 32, a switching valve 24 connected to the other end of the first supply conduit means 32, one end connected to the switching valve 24 and the other end connected to the mixing injection part 28. Second supply line means 33 and circulation line means 34, 2 having one end connected to the switching valve 24 and the other end connected to the storage tank 21.
5 and 35, the switching valve 24 connects the first supply line means 32 and the second supply line means 33 to supply a release agent to the mixing injection part 28. Switching position 24A,
The first supply line means 32 and the circulation line means 34, 2
Between the storage tank 21, the first supply line means 32, and the second switching position 24B for circulating the release agent in the circulation line means 34, 25, 35 by connecting 5, 35 to each other. There is provided a release agent injection device characterized in that the release agent injection device is configured to be switchable.

Further, when the switching valve 24 is switched to the second switching position 24B in order to discharge the mold release agent remaining in the second supply line means 33 and the mixing injection part 28, the switching valve 24 is switched to the second switching position 24B. Second compressed air supply means 41, 30, 39, 29, 40 connected to the second supply conduit means 33 are preferably provided.

[0011]

In the release agent injection device of the present invention having the above structure, when the switching valve is located at the first switching position, the release agent pressure-fed from the storage tank is supplied to the first supply line means and the second supply line means. Is supplied to the mixing / injecting section by the supply pipe means, and compressed air is supplied from the first compressed air supplying means to the mixing / injecting section, and the mold releasing agent and the compressed air are mixed in the mixing / injecting section to thereby perform the die casting machine. The mold release agent is sprayed on the mold attached to the. On the other hand, when the switching valve is located at the second switching position, the release agent in the storage tank is pressure-fed by the circulation line means and circulates between the first supply line means and the storage tank.

Further, when the switching valve is located at the second switching position, the second compressed air is supplied to the second compressed air supply means.
Of the release agent that is supplied to the second supply pipeline unit and the mixing injection unit and is discharged to the second supply pipeline unit and the mixing injection unit.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A release agent injection device according to an embodiment of the present invention will be described with reference to FIG. The release agent injection device includes a storage tank 21 for storing the release agent and an injection nozzle for injecting the release agent onto the surface of a die (not shown) attached to a die casting machine (not shown). 28a, a releasing agent supply means 32 and 33 for supplying a releasing agent from the storage tank 21 to the mixing injection portion 28, and a first portion for supplying compressed air to the mixing injection portion 28. It has one compressed air supply means 41, 36, 26, 37, 27, 38.

The storage tank 21 is configured so as to be hermetically sealed, and is provided with a stirring device 22 for stirring the release agent in the storage tank 21. The mixing injection unit 28 is a storage tank 21.
The release agent supplied from the first compressed air supply means 41,
It is configured such that it can mix the compressed air supplied from 36, 26, 37, 27, and 38 and inject the release agent from the injection nozzle 28a to the mold (not shown).

The storage tank 21 is connected to one end of a first release agent supply pipe 32 for supplying the stored release agent in the direction of the mixing injection part 28. The other end of the first release agent supply pipe 32 is connected to the input port of the switching solenoid valve 24 which is a switching valve. The switching solenoid valve 24 is provided so as to be switchable between a first switching position 24A and a second switching position 24B, which will be described later, by energization and interruption.

The first output port of the switching solenoid valve 24 is connected to one end of a second mold release agent supply pipe 33 for supplying the mold release agent to the mixing injection section 28. Supply pipe 33
The other end of is connected to the mixing injection unit 28. Further, a circulation line means is connected to the second output port of the switching solenoid valve 24. The circulation line means has a first circulation line 34 having one end connected to the second output port, and a pump 2 connected to the other end of the first circulation line 34 for circulating the release agent.
5 and one end is connected to the pump 25 and the other end is the storage tank 2
It has a second circulation line 35 connected to 1. Therefore, when the switching solenoid valve 24 is in the first switching position, it is separated to the mixing injection unit 28 via the first release agent supply pipe 32, the switching solenoid valve 24, and the second release agent supply pipe 33. A supply path for supplying the mold agent is configured. When the switching solenoid valve 24 is in the second switching position, the first release agent supply pipe 32, the switching solenoid valve 24, the first circulation pipe line 34, the pump 25, and the second circulation pipe line 35. A circulation path for returning the release agent to the storage tank 21 via the above is formed.

Further, one end of a compressed air supply pipe 31 for sending compressed air to the storage tank 21 is connected to the storage tank 21, and the other end of the compressed air supply pipe 31 is connected to an output port of the pressure reducing valve 23. There is. The input port of the pressure reducing valve 23 is connected to a compressed air source 41 via a compressed air supply pipe 30. Further, the compressed air supplied from the compressed air source 41 is branched in the middle of the compressed air supply pipe 30, and the branched compressed air is compressed air supply pipe 36, pressure reducing valve 26, compressed air supply pipe 37, solenoid valve 27, and compression valve. It is configured to be supplied to the mixing injection unit 28 via the air supply pipe 38.

The compressed air supply pipe 30 is a compressed air supply pipe 36.
Of the pressure reducing valve 26, and the other end is connected to the input port of the pressure reducing valve 26. One end of the compressed air supply pipe 37 is connected to the output port of the pressure reducing valve 26.
The other end of is connected to the input port of the solenoid valve 27. The output port of the solenoid valve 27 is connected to one end of a compressed air supply pipe 38, and the other end of the compressed air supply pipe 38 is connected to the mixing injection unit 28.

Further, one end of a compressed air supply pipe 39 is connected to the pressure reducing valve 23, separately from the compressed air supply pipe 31 for sending compressed air to the storage tank 21. Therefore, the compressed air whose pressure has been reduced by the pressure reducing valve 23 is configured to branch into the compressed air supply pipe 31 and the compressed air supply pipe 39. The other end of the compressed air supply pipe 39 is connected to the input port of the solenoid valve 29, and the compressed air supply pipe 4 is connected to the output port of the solenoid valve 29.
One end of 0 is connected. The other end of the compressed air supply pipe 40 is connected to the mold release agent supply pipe 33 in order to blow off the mold release agent remaining in the second mold release agent supply pipe 33.

Next, the operation of the release agent injection device configured as described above will be described. In the initial stage, the solenoid valve 24 is in the second switching position 24B. Further, the solenoid valves 27 and 29 are positioned so as to shut off the respective fluid paths. When the operation of the die casting machine (not shown) is started, the stirring device 22 is operated and the release agent in the storage tank 21 is stirred. The release agent stored in the storage tank 21 when the pump 25 is driven stores the first release agent supply pipe 32, the switching solenoid valve 24, the first circulation pipe line 34, and the second circulation pipe line 35. It is returned to the storage tank 21 via. As a result, the release agent is held homogeneously in the release agent supply pipe 32, the first circulation line 34, the second circulation line 35, and the storage tank 21 without being separated from the diluent.

Compressed air is sent from the compressed air source 41, and the compressed air is supplied into the storage tank 21 via the pressure reducing valve 23. The compressed air from the compressed air source 41 is supplied to the compressed air supply pipe 36, reduced in pressure by the pressure reducing valve 26, and shut off by the solenoid valve 27. Further, the compressed air is supplied to the pressure reducing valve 23 and the compressed air supply pipe 39, is reduced in pressure by the pressure reducing valve 29, and is shut off by the electromagnetic valve 29.

When the die casting machine completes the casting, the mold is opened and the product is taken out from the mold. After the mold is cleaned, the driving of the pump 25 is stopped, and the switching solenoid valve 24 is energized to switch from the second switching position 24B to the first switching position 24A. Therefore, the first release agent supply pipe 32 and the second release agent supply pipe 33 communicate with each other. Since the compressed air was continuously supplied into the storage tank 21, the release agent in the storage tank 21 was supplied to the first release agent supply pipe 32, the solenoid valve 24, and the second release agent by this communication. Supply pipe 3
It is pressure-fed and supplied to the mixing injection part 28 via 3. Also, when the solenoid valve is in the first switching position 24A, the pump 25
By the action of, the release agent flows in the first release agent supply pipe 32 in the direction of the mixing injection unit 28 (rightward in FIG. 1).
The mold release agent can be supplied to the mixing injection unit 28 instantly when the switching solenoid valve is switched to the first switching position by the inertial force.

Further, the solenoid valve 27 is energized in conjunction with the energization of the switching solenoid valve 24, so that the compressed air supply pipes 36, 37 and the compressed air supply pipe 38 communicate with each other. Due to this communication, the compressed air supplied from the compressed air source 41 is supplied to the mixing injection unit 28 via the compressed air supply pipe 36, the pressure reducing valve 26, the compressed air supply pipe 37, the electromagnetic valve 27, and the compressed air supply pipe 38. To be done. Then, the release agent and the compressed air supplied to the mixing / injection section 28 are mixed in the mixing / injection section 28, and the release agent is injected from the nozzle 28a to a mold (not shown).

After the release agent is injected for a predetermined time, the switching solenoid valve 24 and solenoid valve 27 are de-energized. Therefore, the switching solenoid valve 24 is switched to the second switching position 24B and the solenoid valve 27 is switched to the shutoff position. Therefore, the solenoid valve 27 cuts off the communication between the compressed air supply pipe 37 and the compressed air supply pipe 38, and cuts off the supply of the compressed air to the mixed injection unit 28. The pump 25 is energized and the operation is restarted in conjunction with the cutoff of the currents of the switching solenoid valve 24 and the solenoid valve 27. By switching the switching solenoid valve 24 to the second position, the first
Of the release agent supply pipeline 32 and the first circulation pipeline 34 of
By driving the pump 25, the release agent is pumped up from the storage tank 21, and the first release agent supply pipeline 32 and the first release agent supply pipe 32 are connected.
The mold releasing agent circulates in the circulation pipeline 34, the pump 25, and the second circulation pipeline 35. Therefore, the release agent is prevented from being deposited and solidified in the release agent supply pipe 32. Since the first release agent supply pipeline 32 occupies most of the release agent supply pipelines 32 and 33, the circulation described above causes stagnation and deposition of the release agent in the pipelines. Solidification is effectively prevented.

Further, the solenoid valve 29 is energized in conjunction with the switching operation of the switching solenoid valve 24, and the compressed air supply conduit 39 and the compressed air supply conduit 40 are communicated with each other. Therefore, the release agent remaining in the second supply conduit 33 and the mixing injection unit 28 is ejected and ejected from the ejection nozzle 28a. After the solenoid valve 29 is energized for a predetermined time, the energization is cut off and the communication between the compressed air supply pipe 39 and the compressed air supply pipe 40 is cut off.

The above-described operation is repeated for each shot.
When the release agent in the storage tank 21 is insufficient,
The supply of compressed air from the compressed air source 41 is stopped, the pump 25 is stopped, the storage tank 21 is opened to the atmosphere, and the release agent is replenished.

In this embodiment, the pump 25 is used as the circulation means of the circulation line means, but other types of circulation means may be used. Further, the concrete type of the pump may be any type such as a piston type, a plunger type, a diaphragm type and the like. When the pump 25 is used as the circulation means, pulsation occurs in the release agent circulated along with the operation of the pump, and the release agent pulsated is the first release agent supply pipe 32 and the circulation line. Since it circulates in the parts 34 and 35, even if the release agent adheres to the inside of the pipe, it becomes possible to remove the adhered release agent.

[0028]

According to the release agent injection device of the present invention described above, the first supply pipeline means and the storage tank are circulated by the circulation pipeline means when the release agent injection of the mixing injection section is stopped. Since the release agent circulates between the two, the release agent does not stay in the first supply line means, and the release agent and the diluent do not separate in the storage tank. Further, by circulating the release agent, there is no stagnation and the adhesion of the release agent into the pipe is suppressed. Furthermore, since compressed air is blown to the second supply pipe means during the circulation of the release agent, neither deposition nor solidification of the release agent in the second supply pipe means occurs. In addition, at this time, the compressed air is also blown to the mixing / injection section, so that it is possible to prevent the release agent from remaining in this section as well.

Further, since the switching valve is switched from the second switching position to the first switching position while the mold release agent is circulating in the first supply line means, inertia force is applied to the mold release agent. Thus, it is possible to easily proceed in the direction of the mixing injection unit. Therefore, the release agent injection timing is not delayed, and the shot cycle can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a release agent injection device according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an outline of a conventional release agent injection device.

[Explanation of symbols]

21 Storage Tank 24 Solenoid Valve for Switching as Changeover Valve 25 Pump as Circulating Pipe Means 27 Solenoid Valve as First Compressed Air Supply Means 28 Mixing Injection Section 29 Solenoid Valve as Second Compressed Air Supply Means 32 First Supply Pipe First releasing agent supply pipe 33 serving as a channel means, second releasing agent supply pipe 34 serving as a second supply pipeline means, first circulation pipeline 35 serving as a circulation pipeline means 35 second releasing pipeline means serving as a circulation pipeline means Circulation pipelines 36, 37, 38 Compressed air supply pipes as first compressed air supply means 39, 40 Compressed air supply pipes as second compressed air supply means

Claims (2)

[Claims] 1. A storage tank for storing a release agent,
A mixing injection unit for injecting the release agent onto the surface of the mold attached to the die casting machine, a release agent supply means for supplying the release agent from the storage tank to the mixing injection unit, and the mixture. A release agent injection device having a first compressed air supply unit connected to the mixing injection unit for mixing compressed air with the release agent supplied from the release agent supply unit in the injection unit, And a switching valve connected to the other end of the first supply line means, the first supply line means communicating with the storage tank and sending the release agent in the storage tank under pressure toward the mixing injection unit. A second supply line means having one end connected to the switching valve and the other end connected to the mixing injection section; and a circulation pipe having one end connected to the switching valve and the other end connected to the storage tank. And a switching means for connecting the first supply line means and the second supply line means. The storage tank and the first supply pipe are connected by connecting the first switching position for continuously supplying the release agent to the mixing injection unit, the first supply pipe means and the circulation pipe means. A releasing agent injection device, which is configured to be switchable between a passage means and a second switching position for circulating a releasing agent in the circulation conduit means. 2. The second supply when the switching valve is switched to a second switching position in order to discharge the mold release agent remaining in the second supply line means and the mixing injection section. The release agent injection device according to claim 1, further comprising a second compressed air supply unit connected to the pipe line unit.