JPH0212625B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold release agent atomizer for supplying atomized mold release agent to the inner surface of a mold incorporated in a die casting machine, and its purpose is to synchronize with the start of air supply. Accordingly, it is an object of the present invention to provide a structure in which a discharge nozzle for a liquid mold release agent opens automatically and has high atomization efficiency.

In conventional atomizers, the liquid cannot be controlled by air pressure, so it is difficult to maintain the ratio of liquid to air within a desired range, and it is also difficult to control the timing of the start and stop of ejection of air and liquid. This required a lot of effort and a complicated valve mechanism, which caused the problem of increasing the size of the device.

The present invention makes it possible to control the amount of liquid discharged by air pressure, and also allows the air to be ejected in advance of the liquid when spraying starts, and shuts off the air later than the liquid when spraying is stopped. The above-mentioned conventional problems are avoided by automating the operation near the nozzle. A mixing chamber connected to the spray nozzle at the tip of the holder is provided inside the spray nozzle, and the mixing chamber connects the liquid discharge nozzle inside the holder with the one outside the holder. A pressurized air source is connected to the external air passageway that connects the pressurized air source and the mixing chamber, and an air volume adjustment knob is provided in the external air passage, and a liquid discharge nozzle is connected to the liquid discharge nozzle via a movable valve whose opening is normally biased in the closing direction. is connected to a release agent liquid supply source outside the holder, and a pressurized air source is connected to the pressurized air chamber of the servo cylinder for opening the valve, and the valve opens following the introduction of pressurized air into the mixing chamber. It is characterized in that the mold release agent is sucked into the mixing chamber from a liquid discharge nozzle and mixed with air, and will be explained in conjunction with the drawings as follows.

In FIG. 1, 1 is a holder, into which a pipe joint 3 is screwed and fixed into a screw hole 2, and a compressed air inlet 4 of the joint 3 is connected to a compressed air tank 34 via a pipe 5 and an air volume adjustment cock 20. . Holder 1
A spray nozzle 7 is screwed into the screw hole 6 by a predetermined amount and is locked by a fixing ring 8. The nozzle 7 is provided with a spout 9 and a cylinder 10 (mixing chamber) concentrically, and a pipe-shaped valve receiver 11 (liquid discharge nozzle) having a rather small diameter is fitted halfway into the cylinder 10. Cylinder 10 and valve receiver 1
A gap 12 having an annular cross section between the two is a portion that becomes a compressed air passage.

The valve receiver 11 is screwed into a screw hole 13 in the holder 1, and the flange 14 is crimped onto the bottom surface 15 of the screw hole 6. The valve receiver 11 has a mold release agent passage 16 in the center, and a seal ring 17 that functions as a valve seat is provided in an annular counterbore at the right end of this passage 16.
is attached, and the needle 19 of the moving valve 18 is fitted into the seal ring 17.

The moving valve 18 includes a small diameter piston 21 and a large diameter piston 22 integrally with the needle 19, and is connected to a small diameter cylinder 25 and a large diameter cylinder 26 of the holder 1 via oil seals 23 and 24, respectively.
(servo cylinder), large diameter piston 2
2 and the valve control cap 27, the needle 19 always receives an elastic force in the direction in which it seats on the seal ring 17 (towards the left). The cap 27 is screwed into the screw 29 of the holder 1 and is provided with a ventilation hole 30. The pressurized air chamber 31 inside the large diameter cylinder 26 is
It communicates with the chamber 33 in the screw hole 6 through the air passage 32, and the strength of the compression spring 28 is such that when compressed air at a predetermined pressure is introduced from the air inlet 4 into the chambers 33, 31, the valve 18 is set so that it moves to the right and the seal ring 17 opens.

Reference numeral 35 denotes a holder, which is screwed into the screw hole 36 of the holder 1 and fixed, and is connected to the water passage 37 and the oil passage 3.
8. Equipped with a needle valve 39 for oil adjustment.
An inlet 40 of the water passage 37 communicates with a water pressure tank 42 through a pipe 41, and a lower end thereof communicates with a chamber 44 within the screw hole 13 through a passage 43 within the holder 1. An inlet 45 of the oil passage 38 communicates with an oil pressurized tank 47 through a pipe 46, and the other end opens at right angles to the side wall of the water passage 37.

Figure 1 shows compressed air entering and water and oil flowing out from the nozzle 9.
It shows the state where it is being sprayed from. To explain the operation of each part to reach this state, first open the cock 20 (air amount control valve), and then open the tank 34.
The compressed air inside is introduced into the chamber 33 inside the holder 1 through the pipe 5 and the pipe fitting 3. The compressed air in the chamber 33 is ejected from the annular gap 12 into the cylinder 10, and at the same time, a part of it passes through the air passage 32 and enters the chamber 31.
, push the valve 18 to the right against the elasticity of the spring 28 to the position shown, and move the valve 18.
is fully opened. At the same time, the mold release agent in the chamber 44 also passes through the seal ring 17 and the passage 16 to the cylinder 10.
Squirt inside.

Until the mold release agent enters the cylinder 10, it is in a state where oil and fat are simply added to water at a predetermined ratio (for example, 0.2 to 0.5%). However, the unmixed mold release agent released from the passage 16 is sucked and agitated by the air flow that is ejected into the cylinder 10 from the annular gap 12 and rapidly expands under reduced pressure, causing water and oil to enter the air. The nozzle 9 remains in a uniformly dispersed mist state.
is sprayed onto the mold. For this reason, the oil and fat diluted with water adheres uniformly to the mold in the form of fine particles.
It is possible to expect the same mold release effect as when using emulsified oil. When the pot 20 is closed, the pressure inside the chamber 31 is reduced, the needle 19 is seated on the seal ring 17, the release agent is blocked, and the spraying is completed.

The present invention can be embodied as described above, and according to the present invention, by adjusting the cock 20,
The amount of spray can be freely adjusted without changing the quality of the spray. In addition, since only one tip 20 is operated at that time, the spray amount adjustment operation is easy. Since both liquid and air can be automatically supplied or cut off by simply opening and closing one pot 20, the supply and cut-off operations are also simple.
Further, it is possible to prevent air from being blown out wastefully during the supply operation or the cut-off operation, and also to prevent the liquid from flowing forward or backward. Moreover, since only one injection control cock 20 is required, the structure can be simplified and manufacturing can be facilitated. Since the pot 20 is provided in the external air passage, the pot 20 can be placed at a position where it can be easily operated away from the mold etc. Furthermore, since the liquid can be blocked near the spray nozzle 7,
In this respect as well, it is possible to prevent waste due to liquid dripping or the like. Furthermore, even if liquid leaks from the valve 18 in the shut-off state, the leaked liquid can be stored in the mixing chamber 10, so that the liquid can flow to the nozzle 7.
It can reliably prevent leakage to the outside. Since the spray nozzle 7 is provided with the mixing chamber 10 and the spout 9, the direction of the spray can be easily determined.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an atomizer according to the invention. 1...Holder, 7...Spray nozzle, 10...Mixing chamber, 18...Movement valve, 20
... Kotoku (air amount control valve), 34 ... Compressed air tank, 47 ... Release agent tank.

Claims (1)

[Claims] 1 A mixing chamber connected to the nozzle is provided in the spray nozzle at the tip of the holder, a liquid discharge nozzle inside the holder is connected to the pressurized air source outside the holder, and an external An air volume adjustment knob is provided in the air passage, and the liquid discharge nozzle is connected to a release agent liquid supply source outside the holder via a movable valve that is normally biased in the closing direction and whose opening can be adjusted. is connected to the pressurized air chamber of the servo cylinder for opening the valve, and following the introduction of pressurized air into the mixing chamber, the valve opens and the mold release agent is sucked into the mixing chamber from the liquid discharge nozzle and mixed with the air. An atomizer for a mold release agent characterized by: