JPH0211372B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an improvement in an impregnating device for impregnating and filling cavities, pinholes, etc. that occur in die-cast products, etc. with an impregnating agent.

(Prior art) An impregnation treatment method that seals pores such as cavities and pinholes that occur in die-cast products, etc. using an organic impregnating agent has been put into practical use, and impregnation equipment that performs this type of treatment has not been used in the past. It is as follows.

In other words, the conventional impregnating apparatus is an airtight device in which the object to be impregnated, that is, the work, is placed, and air is removed and impregnated.
A liquid-tight impregnating treatment tank, an impregnating liquid storage tank that supplies the impregnating liquid to the tank, a communication pipe that communicates between these tanks and moves the liquid between the tanks and is equipped with a valve that can be opened and closed, and communicates with the processing tank. It consists of a decompression treatment. In the impregnation process, first, the workpiece is set in the processing tank, the tank is closed, the tank is evacuated, the valve of the communication pipe is opened to move the impregnation liquid in the storage tank into the processing tank, and then the valve is closed. The processing tank is closed and the inside of the processing tank is pressurized, and the impregnating liquid is pressurized to impregnate and fill the pores of the workpiece. After processing, open the valve of the communication pipe, return the impregnation liquid to the storage tank under pressure, then return the processing tank to atmospheric pressure, open the lid, take out the workpiece, and proceed to the next process such as washing and drying the workpiece. Transport.

On the other hand, Japanese Patent Application Laid-Open No. 59-150655 has been proposed as another conventional technique, and this technique vents air from the processing tank and the storage tank to bleed air from the workpiece. Degas to approximately the same pressure as the tank, open the valve to move the impregnating liquid from the storage tank to the processing tank, perform the impregnation process in the processing tank, return the inside of the processing tank to atmospheric pressure after treatment, and remove the impregnating liquid. The material is returned from the processing tank to the storage tank using pressure, and the workpiece is taken out to complete the impregnation process.

(Problems to be Solved by the Invention) In the former technique, the impregnating liquid is returned from the processing tank to the storage tank under pressure, so the processing tank cannot be opened while the liquid is being returned. It is not possible to take out the workpiece, set it, etc., and therefore the cycle time of the impregnating work becomes long, leading to problems such as poor productivity.

In addition, in the latter case, the storage tank also needs to be constructed airtight to reduce the pressure, and two vacuum tanks are required, one for processing and one for storage, which increases the cost of the entire device, and it takes time to fill the processing tank, which reduces efficiency. There are problems such as poor performance and the need for differential pressure control, which is complicated and troublesome.

The present invention has been made in order to solve the above problems, and its purpose is to provide an impregnation process that can be carried out efficiently and with a shortened cycle time to improve productivity. We are here to provide you with the equipment.

(Means for Solving the Problems) In order to solve the above problems and achieve the objects, the present invention provides an impregnation processing system that stores a workpiece and performs air and impregnation processing on the workpiece in an air-tight and liquid-tight manner. a tank, an impregnating liquid storage tank that stores an impregnating liquid, and a communication pipe that is connected to the bottom of the impregnating liquid storage tank and the bottom of the impregnation treatment tank and communicates both tanks;
An impregnating apparatus comprising an on-off valve provided in the communication pipe and a depressurizing means connected to the upper part of the impregnating tank to enable depressurizing and pressurizing the inside of the tank, the impregnating apparatus comprising: The impregnating liquid storage tank is placed above to form a head, and
A pipe line is provided in parallel with the communication pipe, and the pipe line is provided with an impregnating liquid return pump that can return the impregnating liquid from the impregnating treatment tank to the impregnating liquid storage tank. It is.

(Action similar to the above means) Since the impregnating liquid storage tank is placed above the impregnating tank, the head of the impregnating liquid passing through the communication path can be reduced by opening the on-off valve when the pressure inside the impregnating tank is reduced by the depressurizing and pressurizing means. The movement speed of the impregnating liquid from the impregnating liquid storage tank to the impregnating treatment tank is accelerated by the natural falling of the impregnating liquid, and therefore the impregnating liquid is efficiently and quickly supplied to the impregnating treatment tank.

In addition, a pump for returning the impregnating liquid is installed in the pipeline parallel to the communication pipe, so even if the impregnating liquid storage tank is placed above the impregnating treatment tank, the on-off valve can be closed without using differential pressure. By driving the pump, the impregnating liquid is quickly returned from the impregnating treatment tank to the impregnating liquid storage tank.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The drawing is a schematic explanatory diagram showing one embodiment of the present invention, in which 1 is an impregnation treatment tank and a main body 10 that is open at the top.
1 and a lid 102 that can be opened and closed, and is liquid-tight and airtight when the lid is closed. A downstream end 201 of a communication pipe 2 is connected to the center of the bottom 103 of the main body 101, and an upstream end 202 of the communication pipe 2 is connected to the tank 1.
The tank 1 is connected to the bottom 301 of the impregnating liquid storage tank 3, which is provided above the tank 3 with a head difference, so that the tanks 1 and 3 are connected to each other.

The impregnation liquid 4 is stored in the storage tank 3, and the lid body 302 is opened to the atmosphere through a pipe 303. A valve 5 such as a solenoid valve is interposed in the center of the communication pipe 2, and A bypass pipe 6 is branched to connect the upstream side and the downstream side of the valve 5 at the middle part, a liquid return pump 7 is interposed in the bypass pipe 6, and a valve 8 such as a solenoid valve is installed downstream of this. intervene.

On the other hand, a part of the lid 102 of the impregnation tank 1 is attached to the pipe 9.
A filter 11 and a switching valve 12 such as a solenoid valve are provided on the pipe 9 in front of the pump 10. The other part of the lid body 102 is connected to the switching valves 14, 1 such as electromagnetic valves through the pipe 13.
5, it is connected to a pressure air source 16 and an atmospheric side 17. In the figure, numerals 18 and 19 are sensors for detecting the liquid level within the main body 101 of the tank 1.

Next, to describe the impregnation process, the lid 102 is opened, the pallet 20 holding the work W is stored and set in the main body 101, and the lid 102 is closed. valve 14,
15 is closed, the valve 12 is opened, the vacuum pump 10 is driven, and the inside of the tank 1 is evacuated.
The valve 5 of the communication pipe 2 is opened, while the valve 8 of the bypass pipe 6 is opened.
Keep it closed. As a result, the impregnating liquid 4 moves from tank 3 to tank 1 via the communication pipe 2 due to negative pressure, and since tank 3 is located higher than tank 1 and there is a head difference, the movement due to negative pressure is done quickly. Become. The liquid level is detected by a sensor 19, and filling of the tank 1 is completed at a predetermined level, the valves 5 and 12 are closed, and the communication between the pipes 2 and 9 and the tank 1 is cut off.

Next, the valve 15 is opened and pressurized air is introduced into the tank 1 from the pressurized air source 16 to pressurize the liquid in the tank 1.
The impregnation liquid is pressurized and filled into the cavities, pinholes, etc. of the workpiece W, and the valve 15 is closed to complete the impregnation work.

After the impregnation work is completed, open the valve 14 to release the atmosphere from the tank 1.
The inside of the tank 1 is brought into atmospheric pressure, while the valve 8 of the bypass pipe 6 is opened, and the return pump 7 is opened.
is driven to return the treated liquid in the tank 1 into the storage tank 3 via the pipe 6, and at the same time, the lid 102 of the tank 1 is opened to take out the workpiece.

(Effects of the Invention) As described above, according to the present invention, the impregnating liquid is moved from the impregnating liquid storage tank into the impregnating treatment tank by the negative pressure action, and the pressurizing action by the pressurized air is applied to the blowholes, pinholes, etc. of the workpiece. In an impregnating device that fills the impregnating liquid under pressure, the impregnating liquid storage tank is placed above the impregnating tank, so when the pressure inside the impregnating tank is reduced by the depressurizing means, both tanks can be The rate of movement of the impregnating liquid from the impregnating liquid storage tank to the impregnating treatment tank can be accelerated by the natural fall of the impregnating liquid through the communication passage connected to the bottom pipe of the impregnating liquid storage tank. The impregnating liquid can be supplied efficiently and quickly.

In addition, a pump for returning the impregnating liquid is installed in the pipeline parallel to the communication pipe, so even if the impregnating liquid storage tank is placed above the impregnating treatment tank, the on-off valve can be closed and the pump can be returned without using differential pressure. The impregnating liquid can be quickly returned from the impregnating treatment tank to the impregnating liquid storage tank by driving the impregnating liquid.

In this way, it is possible to quickly transfer the impregnating liquid from the impregnating liquid storage tank to the impregnating treatment tank and returning the impregnating liquid from the impregnating liquid storage tank to the impregnating liquid storage tank. Since pressure is not used, it is possible to take out and set the workpiece from the impregnation tank while the impregnating liquid is being returned, which reduces the cycle time of the impregnation process, including the removal of the workpiece. Efficiency can be increased and productivity improvements can be achieved.

[Brief explanation of drawings]

The drawings are explanatory diagrams showing one embodiment of the present invention. In the drawings, 1 is a processing tank, 2 is a communication pipe, 3 is a storage tank, 5 is a valve, 6 is a bypass pipe, 7 is a pump, 8 is a valve, and 10 and 16 are pressure increasing and reducing means.

Claims (1)

[Scope of Claims] 1. An impregnating tank configured to be airtight and liquid-tight for storing a workpiece and performing air removal and impregnation processing on the workpiece, an impregnating liquid storage tank storing an impregnating liquid, and the impregnating liquid storage tank. and a communication pipe connected to the bottom of the impregnation treatment tank and communicating the two tanks;
An impregnation device comprising an on-off valve provided in the communication pipe and a depressurizing and pressurizing means connected to an upper part of the impregnating tank and capable of depressurizing and pressurizing the inside of the tank, the impregnating device comprising: An impregnating liquid storage tank is placed above to form a head, and a pipe line is provided in parallel with the communication pipe, and the pipe line includes:
An impregnating device comprising an impregnating liquid return pump capable of returning the impregnating liquid from the impregnating treatment tank to the impregnating liquid storage tank.