JPH0716642B2 - Liquid impregnation apparatus and impregnation method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for impregnating a porous object such as a cast product, a sintered product, wood and ceramics with a liquid.

[0002]

2. Description of the Related Art Conventionally, the yield and reliability of products have been improved by improving the corrosion resistance and pressure resistance of a porous object to be treated to a gas or liquid, or increasing the density and strength. Therefore, a sealing treatment is performed by impregnating a liquid sealing agent. For that purpose, an apparatus as shown in FIG. 4 is usually used. When performing the impregnation operation by this, the lid of the pressure-resistant impregnation tank 51 is opened, the object to be treated is placed inside the lid, and the lid is closed. The opening / closing valve 54 provided in the communication pipe with is opened, and the inside of the impregnation tank 51 is extended by the vacuum pump 53 for about 10 to 15 minutes to be 2 to 5 mm.
Reduce the pressure to about Hg. Then, the on-off valve 54 is closed and the on-off valve provided in the communication pipe with the impregnating liquid supply tank 52.
55 is opened, and the amount of the impregnating liquid enough to sufficiently immerse the object to be treated in the impregnating tank 51 is supplied from the impregnating liquid supply tank 52 by the pressure difference between the two tanks 51, 52. Then open / close valve 55
And the opening / closing valve 57 provided in the communication pipe with the compressor 56 is opened, and the inside of the impregnation tank 51 is filled with the pressurized air from the compressor 56 for about 10 to 15 minutes,
Impregnation is performed by applying a pressure of about 7 kg / cm ² . Then, the opening / closing valve 57 is closed and the opening / closing valve 55 is opened to return the impregnating liquid in the impregnating tank 51 into the impregnating liquid supply tank 52. Then open / close valve 55
And the open / close valve 58 provided in the communication pipe open to the atmosphere is opened to release the residual pressure in the impregnation tank 51, and then the lid of the impregnation tank 51 is opened to take out the object to be treated. It was

[0003]

By the way, in the treatment method as described above, decompression in the impregnation tank, supply of the impregnation liquid from the impregnation liquid supply tank to the impregnation tank, pressurization in the impregnation tank, and in the impregnation tank. Since all the processes such as returning the impregnating liquid to the impregnating liquid supply tank and releasing the residual pressure in the impregnating tank are all performed using air, each of those processes requires a long time. However, there is a problem that it takes an extremely long time as a whole, and if any one of these steps is shortened due to some reason, satisfactory impregnation cannot be performed.

Therefore, an object of the present invention is to solve the problems of the conventional impregnating apparatus and its method as described above, and to impregnate a porous object with an impregnating liquid in a short time. It is an object of the present invention to provide an impregnating device and a method for obtaining a sealed portion having a good impregnation state and excellent durability.

In order to achieve the above object, the present invention provides a pressure-resistant impregnation tank and a rapid decompression means connected to the impregnation tank for rapidly decompressing the inside thereof. , The impregnating liquid supply tank, which is connected to the impregnating tank and the rapid decompression means, and in which the impregnating liquid is stored, and the impregnating tank is moved in a sealed state while holding the object to be treated, and the impregnating tank is impregnated. An impregnating liquid pressurizing means for directly pressurizing the liquid, a moving means for moving the impregnating liquid pressurizing means, a valve member for opening and closing a connecting portion between the impregnating tank and the rapid depressurizing means, an impregnating liquid supply tank, an impregnating tank, and And a valve member that opens and closes a connecting portion with the rapid depressurizing means. According to a second aspect of the present invention, in the first aspect of the present invention, the impregnating liquid pressurizing means includes a piston member having an outer circumference that is in sliding contact with the inner circumference of the impregnation tank, and the piston member is provided with an air escape groove on its bottom surface. Further, a bracket for holding the object to be processed is provided below the bracket. According to a third aspect of the present invention, in the second aspect of the present invention, the piston member is provided with an operating rod at an upper portion thereof, and an upper end of the operating rod is attached to a horizontal beam.
This elevating beam is characterized in that it is supported by columns installed on both sides of the impregnating tank so as to be able to ascend and descend, and is moved up and down by an operating member. The invention of claim 4 is characterized in that, in the invention of claim 1, a cooling pipe and a stirring member are provided in the impregnating liquid supply tank. According to the invention of claim 5, the valve member blocks the flow of the impregnating tank and the rapid depressurizing means, and the rapid depressurizing means is caused to flow through the impregnating solution supply tank in which the impregnating solution is stored, to thereby impregnate the impregnating solution supply tank. The pressure inside is rapidly reduced,
Then, after charging the impregnating liquid pressurizing means holding the porous object to be treated into the pressure-resistant impregnating tank containing the impregnating liquid, the impregnating liquid pressurizing means is moved to seal the impregnating tank, Then, the flow of the impregnating liquid supply tank and the rapid depressurizing means is blocked by the valve member, and the rapid depressurizing means and the inside of the impregnating tank are communicated with each other to rapidly depressurize the impregnating liquid in the impregnating liquid supply tank. A part of the solution is circulated in the impregnation tank, and then the impregnation solution is directly impregnated with the impregnation solution by means of the impregnation solution pressurizing means moving in the impregnation tank to impregnate the object with the impregnation solution. It is a feature.

[0006]

In the present invention as described above, the impregnating liquid is stored in the pressure-resistant impregnation tank, the porous object to be treated is loaded into the pressure-resistant impregnation tank, and then the pressure-resistant impregnation tank is subjected to the rapid depressurization means. The inside is rapidly depressurized, and then the impregnating liquid is directly impregnated by the impregnating liquid pressurizing means without interposing air, whereby the object is impregnated with the liquid. At this time, the impregnating liquid pressurizing means is provided with a piston member having an outer periphery that is in sliding contact with the inner periphery of the impregnating tank, and is lowered while holding an object to be treated with a bracket provided below the piston member so that the liquid surface of the impregnating liquid is directly exposed. Pressurization is performed, but at that time, excess impregnating liquid and residual air are discharged into the impregnating liquid tank from the air escape groove on the bottom surface of the piston member, and the piston member rises after impregnation. The lifting and lowering of the piston member is performed by lifting and lowering a lifting beam, to which the upper end of the operating rod provided on the upper part of the piston member is attached, along the column by the operating member. Further, in the impregnating liquid supply tank for supplying the impregnating liquid to the impregnating tank, the impregnating liquid is cooled by the cooling pipe and stirred by the stirring member.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In the embodiment of the present invention shown in FIGS.
Reference numeral 1 denotes a pressure resistant impregnation tank. A vacuum nozzle 5 and an impregnation liquid nozzle 14 are provided on the peripheral wall of the impregnation tank 1, and the impregnation tank 1 is provided above the opening of the impregnation tank 1.
A piston member 2 having an outer circumference that slidably contacts the inner circumference of
This piston member 2 has a radial air escape groove 16 on its bottom surface.
Is provided, and an operating rod 3 is attached to the upper part thereof, and the upper end of the operating rod 3 is attached to a vertically-arranged beam 13. A nut 6 is provided at both ends of the elevating beam 13, and the nut 6 is rotatably installed on a column beam 12 supported between a pair of columns 11 formed on both sides of the impregnation tank 1. The screw shaft 15 is screwed into the shaft 15, and the screw shaft 15 is rotated by the motor 10 with a brake via the transmission mechanisms 4 and 9. Further, slide bearings 8 are provided at both ends of the elevating beam 13, and the slide bearings 8 are slidably fitted to the slide rails 7 provided on the columns 11. A bracket 19 having an open side surface is attached to the lower surface of the piston member 2, and a pedestal 17 that supports a mounting jig 20 for a workpiece 18 is provided at the bottom of the bracket 19. Impregnation liquid supply tank 26 in parallel with impregnation tank 1
The impregnating liquid supply tank 26 is connected to the impregnating tank 1 through an impregnating liquid supply pipe 21 whose tip communicates with the impregnating liquid nozzle 14, and the upper lid 25 of the impregnating liquid supply tank 26 has an opening / closing lid. Is provided with an opening 27, and a spiral cooling pipe 28 and a stirring member 30 are arranged inside the stirring member 30.
Is projected through the upper lid 25 to the outside and is rotated by the motor 29. By cooling the impregnating liquid in the impregnating liquid supply tank 26 by the cooling pipe 28, the quality is stable for a long period of time. The mixing of the curing agent is carried out well by being held by the stirring member 30 and being stirred by the stirring member 30. Reference numeral 32 represents a level switch for the liquid level of the impregnating liquid.

According to the present invention, as shown in FIG. 3, the impregnating liquid supply pipe 21 is provided with an opening / closing valve 31, and the impregnating liquid supply pipe 21 and the bottom of the impregnating tank 1 are provided with a branch pipe upstream thereof. A drain valve 40 is provided in the branch line 35. Reference numeral 33 denotes a vacuum pump connected to the vacuum nozzle 5 by a pipe line 34. An automatic three-way valve 36 is provided in this pipe line 34, and one of them is provided with an impregnating liquid supply tank via a pipe line 37.
26 is connected, and the middle of the automatic three-way valve 36 of the pipe 34 and the vacuum nozzle 5 and the pipe 37 are connected by a branch pipe 38.
38 is provided with an on-off valve 39, an automatic 3-way valve 36 and a vacuum nozzle 5
A leak conduit 44 is branched to the conduit 34 in the middle of the above, and an opening / closing valve 43 is provided in the leak conduit 44.

The operation of the above will be described. Before impregnation treatment step The three-way valve 36 is operated to shut off the pipeline 34 and the vacuum nozzle 5, and the pipeline 34 and the pipeline 37 are communicated with each other to open and close the on-off valves 31, 43.
Also, the drain valve 40 is closed, and the vacuum pump 33 is operating during this time to hold the impregnating liquid supply tank 26 in a vacuum state of at least about 1 mmHg to deaerate the impregnating liquid 42 in the tank 26. In FIG. 1, the liquid levels of the impregnating liquid 42 in the impregnating tank 1 and the impregnating liquid supply tank 26 are L3 and H1, respectively. The lower surface of the piston member 2 is at the position L1, and in this state, the object 18 to be processed is set on the mounting jig 20 on the pedestal 17 of the bracket 19.

During the impregnation process, the motor 10 is operated, the screw shaft 15 is rotated through the transmission mechanisms 4 and 9, and the lifting beam 13 is lowered through the nut 6, so that the lower surface of the piston member 2 is located at the position L2. When it reaches, the piston member 2 is stopped. As a result, when the opening of the impregnation tank 1 is closed by the piston member 2, the three-way valve 36 is operated to shut off the pipeline 34 and the pipeline 37, and
The vacuum nozzle 5 and the pipe line 34 are communicated with each other, the opening / closing valve 31 is opened, the drain valve 40 is kept closed, and the inside of the impregnation tank 1 is instantly brought to a vacuum state by the operating vacuum pump 33.

When the vacuum levels in both tanks 1 and 26 become equal in this way, the on-off valve 31 is closed and the on-off valve is closed.
Open 39. By doing so, the liquid level of the impregnating liquid 42 in both tanks 1 and 26 becomes H2, and when the vacuum degree and the vacuum time in the impregnating tank 1 reach the set values of 1 mmHg and 10 seconds respectively in this state. , The motor 10 is restarted to lower the piston member 2, and the lowering is continued even after the bottom surface reaches the surface of the impregnating liquid 42. Due to this descending, the surplus impregnation liquid 42 in the impregnation tank 1 and the residual air between the bottom surface of the piston member 2 and the surface of the impregnation liquid 42, that is, the defoaming gas,
It is discharged into the impregnating liquid supply tank 26 through the opening / closing valve 31 through the relief groove 16 on the bottom surface of the piston member 2.

When the lower surface of the piston member 2 reaches the position L3 in this way, the on-off valve 39 is closed, the vacuum pump 33 is stopped, and the piston member 2 is further lowered in this state, whereby the inside of the impregnation tank 1 is closed. Is increased to about 20 kg / cm ² and pressure impregnation is performed. When this process continues for 10 seconds or more, which is the set time, the opening / closing valve 43 is opened to raise the piston member 2 to the position L1, while the pipe line 34 and the vacuum nozzle 5 are shut off, and the pipe line 34 and the pipe line 34 are closed. 37, the impregnation tank 1 is returned to the atmospheric pressure to return to the state before the impregnation process step, and the bracket 19 is mounted on the jig 20 to be processed.
Take 18 out.

[0013]

The present invention is as described above, and the impregnating liquid supply tank in which the impregnating liquid is stored by the rapid depressurizing means after the flow of the impregnating tank and the rapid depressurizing means is blocked by the operation of the valve member. The inside of the pressure-resistant impregnating tank containing the impregnating liquid is moved by depressurizing the inside rapidly and then moving the impregnating liquid pressurizing means holding the porous object by the operation of the moving means to seal the impregnating tank. Then, after the flow of the impregnating liquid supply tank and the rapid depressurizing means is cut off by the operation of the valve member, the pressure in the impregnating tank is rapidly reduced by the rapid depressurizing means, and a part of the impregnating liquid in the impregnating liquid supply tank is removed. The impregnating liquid is circulated in the impregnating tank, and then the impregnating liquid is moved directly in the impregnating tank by directly pressurizing the impregnating liquid without passing through air. When the object to be treated is taken in or out of the impregnation tank, it is not necessary to manually open and close the lid of the impregnation tank, and it is not necessary to perform it, and the pressure of the high pressure air is not used during the impregnation process on the object to be treated, and the rapid decompression means is used. The impregnation tank is closed by the movement of the impregnating liquid, and the object to be treated is immersed in the impregnating liquid, and then the impregnating liquid is pressurized by the impregnating liquid pressurizing means. It can be shortened, the whole process can be performed in a short time, and since the impregnation is performed in a vacuum atmosphere, the impregnated state is good and a sealed portion with excellent durability is obtained, and The piston member of the impregnating liquid pressurizing means is provided with an air escape groove on the bottom surface thereof, and a bracket for holding the object to be processed is further provided under the piston member. The tongue member is provided with an operating rod on the upper part, and the upper end of this operating rod is attached to a horizontal elevating beam, and the elevating beam is supported by columns supported on both sides of the impregnation tank so as to be able to ascend and descend, and is elevated by the operating member. As a result, the impregnating liquid pressurizing means can be moved accurately in a short time. Further, since the cooling pipe and the stirring member are provided in the impregnating liquid tank, the impregnating liquid is cooled. In addition to being able to stably maintain the quality for a long period of time, the effect of mixing the curing agent well is achieved by stirring.

[Brief description of drawings]

FIG. 1 is a partial vertical front view of an embodiment of the present invention.

FIG. 2 is a plan view of a part of the above.

FIG. 3 is a piping diagram of air and an impregnating liquid of the above.

FIG. 4 is a piping diagram of a conventional liquid impregnation device of the same type as the present invention.

[Explanation of symbols]

1 Impregnation tank 2 Piston member 5 Vacuum nozzle 14 Impregnation liquid nozzle 18 Workpiece 20 Mounting jig 21 Impregnation liquid supply pipe 26 Impregnation liquid supply tank 33 Vacuum pump 42 Impregnation liquid

Claims (5)

[Claims] 1. A pressure-resistant impregnation tank, a rapid decompression means connected to this impregnation tank for rapidly decompressing the inside thereof, and an impregnation tank and a rapid decompression means, and an impregnation liquid is stored inside. An impregnating solution supply tank, and an impregnating solution pressurizing means for directly pressurizing the impregnating solution in the impregnating tank by moving the impregnating tank in a sealed state while holding the object to be treated.
Moving means for moving the impregnating liquid pressurizing means, a valve member for opening and closing a connecting portion between the impregnating tank and the rapid depressurizing means, and a valve member for opening and closing a connecting portion between the impregnating liquid supply tank, the impregnating tank and the rapid depressurizing means. And a liquid impregnating device. 2. The impregnating liquid pressurizing means comprises a piston member having an outer circumference that is in sliding contact with the inner circumference of the impregnating tank, the piston member having an air escape groove on the bottom surface thereof and further holding the object to be treated at the lower portion thereof. The liquid impregnating device according to claim 1, further comprising a bracket for controlling the liquid impregnation. 3. The piston member is provided with an operating rod at an upper portion thereof, and an upper end of the operating rod is attached to a horizontal elevating beam,
3. The liquid impregnation apparatus according to claim 2, wherein the elevating beam is supported by columns supported on both sides of the impregnation tank so as to be able to ascend and descend, and is elevated by an operating member. 4. The liquid impregnation apparatus according to claim 1, wherein a cooling pipe and a stirring member are provided in the impregnating liquid supply tank. 5. A valve member shuts off the flow between the impregnating tank and the rapid depressurizing means, and the rapid depressurizing means is passed through the inside of the impregnating solution supply tank containing the impregnating solution so that the inside of the impregnating solution supply tank is closed. Rapidly depressurize, then load the impregnating liquid pressurizing means holding the porous object to be processed into the pressure-resistant impregnation tank containing the impregnating liquid, and then move the impregnating liquid pressurizing means to impregnate. The tank is sealed, and then the flow of the impregnating liquid supply tank and the rapid depressurizing means is blocked by a valve member, and the rapid depressurizing means and the inside of the impregnating tank are connected to rapidly depressurize the impregnating tank to supply the impregnating liquid. A part of the impregnating liquid in the tank is circulated in the impregnating tank, and then the impregnating liquid is directly pressurized by the impregnating liquid pressurizing means moving in the impregnating tank without passing through air, whereby the impregnating liquid is applied to the object to be treated. Including A liquid impregnation method characterized by immersing.