JPH0566189B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection device, and particularly to an injection device for resin, solder, etc.

(Prior Art) Conventionally, as shown in FIG. 2, a conventional injection device has been used, for example, to put resin etc. into a first tank 21, put the main material and hardening agent etc. into a second tank 22,
The contents of the first tank 22 and the second tank 22 are pumped 23 respectively.
and 24, the mixture is sent to a mixing tank 25, mixed there, and discharged to the outside through a nozzle 26. The discharge amount is determined by contracting a pinch valve 27 through a nozzle 26 made of an elastic body.

In addition, as shown in FIG. 3, another conventional technique is to fill a cylinder 28 with cream solder or the like, apply pressure to a rubber stopper 29, and apply pressure to a nozzle 30.
There are structures that extrude from the

(Problems to be Solved by the Invention) However, these conventional techniques have a drawback that the contents drip from the tip of the nozzle. In order to prevent this drawback, the temperature of the contents should be controlled to keep the viscosity above a specified value, the pressure of the pump should be controlled, and the shape of the nozzle should be designed to prevent dripping. However, it is not perfect and is expensive. There are also mechanisms that use a direct air device to lower the pressure inside the nozzle to prevent dripping after discharging the contents from the nozzle.
The disadvantages were that the mechanism was complicated, large, and expensive.

The object of the present invention is to improve the above-mentioned drawbacks, to provide an inexpensive injection device that can prevent dripping.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an injection device capable of discharging a liquid from a nozzle. a first control mechanism that can press a part of the nozzle to stop discharging the liquid material; and a first control mechanism that presses the tip of the nozzle at almost the same time as the first control mechanism and is released before the first control mechanism releases the pressure. The present invention provides an injection device characterized by having a second control mechanism.

(Operation) According to the present invention, the first control mechanism and the second control mechanism are operated almost simultaneously to press the nozzle to stop discharging the liquid, and then the pressure of only the second control mechanism is released. This allows the pressure inside the nozzle to be lower than the outside pressure, thereby preventing the liquid from being drawn into the nozzle and dripping.

(Examples) The present invention will be described below based on illustrated examples.

In FIG. 1, 1 is a first tank filled with resin and the like. 2 is a second tank, which is filled with the main material and the like. 3 and 4 are pumps connected to the first tank 1 and the second tank 2, respectively. A mixing tank 5 is connected to the pumps 3 and 4, and is used to mix the contents of the first tank 1 and the second tank 2 sent by the pumps 3 and 4. 6 is a discharge tube pulled out from the mixing tank 5. Reference numeral 7 denotes an elastic introduction tube attached to the tip of the discharge tube 6, and is made of silicone rubber, thin plastic, or a metal plate. 8 is this introduction tube 7
It is an ejection tube attached to the tip of a barrel, and is made of plastic or metal and has a tapered shape at the tip. The nozzle 9 connects these introduction tubes 7 and discharge tubes 8.
It consists of. 10 is a first valve consisting of a pinch valve;
It is a control mechanism that presses the base of the introduction tube, and is provided on the side facing the movable piece 12 via the electromagnetic coil 11, the movable piece 12 operated by the electromagnetic coil 11, and the introduction tube 7. It consists of a receiving plate 13. Reference numeral 14 denotes a second control mechanism consisting of a pinch valve, which presses the side beyond the introduction tube 7, and includes an electromagnetic coil 15, a movable piece 16 operated by the electromagnetic coil 15, and a second control mechanism that is movable via the introduction tube 7. It consists of a piece 16 and a receiving plate 17 provided on the opposite side.

Next, the operation of the above embodiment will be described.

First, start the pumps 3 and 4 to fill the first tank 1.
and the contents of the second tank 2 are sent to the mixing tank 5. 1st
When the control mechanism 10 and the second control mechanism 14 are not operating, the contents of the mixing tank 5 are directly discharged to the outside through the discharge tube 6, the introduction tube 7, and the discharge tube 8. After a predetermined time, the first control mechanism 10 and the second control mechanism 14 are operated almost simultaneously, and the movable piece 12
and 16 are pressed against the introduction tube 7 to dent the pressed portion and close it. Therefore, the discharge from the discharge tube 8 is stopped. Then, while only the movable piece 12 presses the introduction tube 7, the pressure of the movable piece 16 is released. When the pressure of the movable piece 16 is released, the pressure inside the nozzle 9 becomes lower than the external pressure, and the contents in the discharge tube 8 are drawn into the interior and do not drip from the discharge tube 8.

As the first control mechanism and the second control mechanism, in addition to one using an electromagnetic coil, a movable piece may be moved by air, or a cock-type one may be used. Further, the two may be of different types, such as one using an electromagnetic coil and the other using air. In other words, it may be one that mechanically compresses and closes the introduction tube in the form of an elastic body.

Further, in the above embodiment, the case where two tanks were used was described, but the case where the number of tanks is one or three or more may be used, and the contents thereof may include liquid paint and resin in addition to resin. It is also used for liquid substances such as oil, silver paste, and solder paste.

(Effects of the Invention) As described above, according to the present invention, by lowering the pressure inside the nozzle and drawing the contents into the nozzle, it is possible to prevent the contents from dripping. In particular, since the first control mechanism and the second control mechanism are pressed against the elastic body part of the nozzle almost simultaneously, the operation is one step less than when the second control mechanism is pressed first, making it faster. And it can reliably prevent sagging. Therefore, it is possible to more accurately inject a certain amount into a container or the like. Therefore, a certain amount can be accurately poured into a container or the like. Moreover, an injection device that can be easily configured, inexpensive, and miniaturized can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a front view of a conventional injection device, and FIG. 3 is a front sectional view of another conventional injection device. 9... Nozzle, 10... First control mechanism, 14...
...Second control mechanism.

Claims (1)

[Scope of Claims] 1. An injection device capable of discharging a liquid from a nozzle, including a nozzle having an elastic body-like part, and a first control capable of pressing the elastic body-like part of the nozzle to stop discharging the liquid. and a second control mechanism that presses the tip of the nozzle almost simultaneously with the first control mechanism and opens before the first control mechanism releases the pressure. 2. The injection device according to claim 1, wherein the first control mechanism and the second control mechanism are pinch valves.