JPH0136566Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention involves dissolving ceramic powder in water to form a slurry (hereinafter referred to as ceramic slurry) and pressurizing it in a porous mold. The present invention relates to a ceramic slurry pressurizing device used for producing a solid ceramic molded body while sucking out moisture in the ceramic slurry through the pores of a mold.

(Prior art and its problems) Conventionally, a general pressure pump has been used as a pressurizing device to pressurize the slurry to a predetermined pressure in the above-mentioned ceramic molding. Due to its structure, the pump must be carefully cleaned every time the type of slurry used changes, resulting in a significant loss of time, and pump-type systems require a certain amount of fluid to be used. Since it cannot be used, when pressurizing a small amount of ceramic slurry, it is either impossible to actually use it, or it is inconvenient that an extra amount of slurry must be added.

(Technical means for solving the problem) In view of the above circumstances, the present invention is a slurry pressurizing device that is easy to clean, convenient to handle, and can pressurize even a small amount of slurry without any problems. The technical means for achieving this purpose is to insert an inflatable bag 25 into the main container 24 and open the opening 25a of this bag.
is inserted into the main container 2 through the cap unit 26 which is detachably attached to the mouth 24a of the main container 24.
4, the inside of the bag 25 is used as a slurry pressurizing chamber 27, and the space between this bag 25 and the main container 24 is used as a pressurizing fluid chamber 28,
A slurry introduction pipe 29 for introducing the ceramic slurry to be pressurized into the slurry pressurizing chamber 27 is inserted into the mouth unit 26 so that its lower end extends close to the inner bottom of the bag body 25, and The slurry pressurizing chamber 27 is characterized by being provided with an air vent for appropriately releasing the air in the pressurizing chamber 27.

(Example) Examples of the present invention will be described below based on the drawings.

FIG. 1 schematically shows the entire ceramic molding device. This molding device presses the upper and lower surfaces and the peripheral side portions of a plaster mold 1 for molding, and completely molds the plaster mold 1 from the outside. A mold support device 2 for supporting the ceramic slurry S, and a vacuum stirring type defoaming device 3 for removing air bubbles in the slurry S that may cause defective products before injecting the ceramic slurry S into the plaster mold 1. , 10 to 250 Kgf/cm ² to the degassed ceramic slurry S injected into the plaster mold 1.
The pressure device 4 is configured to include a pressurizing device 4 for applying high pressure.

The plaster mold 1 has a truncated conical shape as a whole, and consists of a plurality of upper and lower plaster molds 1a, 1b... Each of these divided plaster molds 1a, 1b... has a required molding chamber (cavity) 1a ₁ inside. , 1a ₂ . . . Although not shown, each divided plaster mold is a so-called split mold and is divided into two vertically (or horizontally). Moreover, this plaster mold 1 is porous with countless micropores, and allows moisture to pass between the inside and outside of the molding chamber.

The mold support device 2 is a porous cylindrical mold that is externally fitted onto the plaster mold 1 and has a tapered inner peripheral surface 5a formed to correspond to the tapered outer peripheral surface of the plaster mold 1. 5, and a receiving plate 7 that receives the lower end surface of the plaster mold 1 and the formwork 5 fitted therein via a packing 6.
, a presser plate 9 placed on the upper surface of the plaster mold 1 and the mold 5 via a packing 8, and a plaster mold 1 supported on the receiving plate 7 and held within the cylindrical mold 5. Screw press 1 for pressing via presser plate 9
0, and the cylindrical form 5 is provided with a large number of small through holes (not shown), and the outer periphery of the cylindrical form 5 is covered with an outer cylinder member 11. When using this mold support device 2, a presser plate 9 is disposed, and by rotating a screw member 13 screwed into the center of the upper frame 12, a plaster mold is inserted through the presser plate 9. An appropriate downward load is applied to the plaster mold 1 to compress it slightly, and this compression causes the plaster mold 1 to bulge outward in the radial direction due to the action of a taper, so that the outer peripheral surface becomes the inner peripheral surface 5 of the mold 5.
At the same time, both upper and lower surfaces of the plaster mold 1 are brought into pressure contact with the retaining plate 9 and the receiving plate 7 via the packings 8 and 6, so that the plaster mold 1 is fully supported from the outside. That's what I do. In this case, when the cylindrical form 5 is fitted onto the receiving plate 7, the plaster mold 1 is made to protrude slightly from the upper surface of the form 5 in a non-loaded state.

The defoaming device 3 includes a slurry tank 14 consisting of a tank body 14a and a lid 14b attached to the top of the tank so as to be openable and closable, and the ceramic slurry S supplied to this tank 14 is stirred by a rotating blade. The slurry tank 14 includes a stirring means 15, and a vacuum pump 16 for sucking out the air inside the slurry tank 14. The vacuum pump 16 connects to the slurry tank 14 via pipes 17, 18, 19.
is connected to the lid body 14b side. In addition, 20 is 3
Slurry tank ¹
This is an air pressure source for supplying the defoamed ceramic slurry S under pressure into the tank 4 and sending it out from the delivery port 21 at the bottom of the tank. 19.

Next, the pressurizing device 4 will be explained. As shown in detail in FIG. The mouth part 25a of the bag body 25 is sealed inside the mouth part 24a of the main body container 24 through the mouthpiece unit 26, and the inside of the bag body 25 is made into the slurry pressurizing chamber 2.
7. Also, the space between the bag body 25 and the main container 24 is used as a fluid chamber 28 for pressurizing slurry, and a chamber is provided inside the mouthpiece unit 26 for introducing the ceramic slurry to be pressurized into the slurry pressurizing chamber 27. A slurry introduction pipe 29 made of a flexible material is inserted so that its lower end approaches the inner bottom of the bag body 25, and an air release valve (atmosphere release valve) 30 is further connected to the base unit 26. Therefore, a branch pipe 3 is branched from the main pipe 31 which is piped between the slurry tank 14 and the plaster mold 1.
Ceramic slurry S is constantly introduced into the slurry pressurizing chamber 27 inside the bag body 25 through the slurry introduction pipe 29 from 2, and this bag body 25 and the main container 24
10 to 250 in the slurry pressurizing fluid chamber 28 between
Kgf/cm ² high pressure oil is supplied to the bag 25 until the pressure of the slurry S in the bag 25 is balanced with the pressure oil.
5 is compressed. The lower end of the slurry introduction pipe 29 is beveled so that the lower end opening of the pipe 29 will not be blocked when the bag body 25 is compressed. By pressurizing the slurry in the fluid chamber 28 by the pressurizing device 4, the slurry in the branch pipe line 32 and the main pipe line 31 is pressurized, and thereby the slurry in the plaster mold 1 is pressurized. It's summery. Pressure oil is supplied to the fluid chamber 28 for pressurizing the slurry by pressurizing the oil in the oil tank 32 to a required high pressure using the pressurizing pump 33 and then supplying the oil from the oil supply port 35 of the main body container 24 via the hydraulic pipe line 34. Fluid chamber 28
It is now being supplied to Note that 36 is an oil drain port connected to the tank 32 via a conduit 37, and this conduit 37 is provided with an on-off valve 38.

The cap unit 26 includes a hollow shaft-shaped cap body 39 having a large-diameter shaft portion 39a that can fit into the mouth portion 24a of the main container 24 on the lower end side, and a large-diameter shaft portion 39a of the cap body 39. Consisting of a tightening screw plug 40 that is externally fitted on the upper side, and a pipe connection pipe body 42 that is rotatably connected to the upper end of the mouthpiece body 39 via a nut member 41, this pipe connection The upper end of the connecting pipe 43 is fixed to a small diameter hole 42c provided between the pipe connection port 42a at the upper end of the utility pipe body 42 and the large diameter hole 42b at the lower end.
The slurry introduction pipe 2 is connected to the lower end of this connecting pipe 43.
9 are connected. In order to attach the cap unit 26 to the mouth 24a of the main container 24, the bag 25 is inserted into the main container 24 prior to this attachment, and the mouth 25a of the bag 25 is inserted into the mouth 24a of the main container 24. It is locked to the lower end locking step portion 24b,
The cap body 39 is fitted into the mouth portion 24a, and the tightening screw plug 40 fitted onto the mouth portion 24a of the main body container 24 is screwed and tightened. Pipe body 42 at the upper end
are connected by a nut member 41, and a slurry introduction pipe 29 is connected to the pipe body 42 in a hanging manner.
is inserted from the inside of the cap body 39 to the inside of the bag body 25. In addition, the pipe body 42 for pipe connection
An air vent hole 30a is provided on the side of the large diameter hole 42b, and the air release valve 30 is opened through this hole 30a.
The branch pipe line 32 is connected to the pipe connection port 43a at the upper end. Then, to remove the cap unit 26 and the bag body 25 from the main container 24, the removal operation is performed in the reverse order of the above-mentioned operations. Incidentally, the main body container 24 is provided with an air vent hole 44 for appropriately discharging the air in the slurry pressurizing fluid chamber 28, and this hole 44 is equipped with an atmosphere release valve.

When using this pressurizing device, the ceramic slurry supplied into the bag body 25 from the branch pipe line 32 is introduced into the bottom of the bag body 25 through the slurry introduction pipe 29 and from there as indicated by the arrow in FIG. As shown, the slurry flows up along the inner surface of the bag 25 and is stored inside the bag 25, that is, in the slurry pressurizing chamber 27. Therefore, the slurry is in the bag body 25.
If air remains in the bag body 25 when the slurry is introduced into the slurry for the first time, the air in the bag body 25 is naturally forced upward by the slurry introduced through the slurry introduction pipe 29. Therefore, a situation in which air is mixed into the slurry is avoided, and if the air bleed valve 30 is opened at this time, the air can be easily and reliably bleed.

Note that the pressurizing fluid is not limited to oil as in this embodiment, but may also be air or water.

To explain the process of forming ceramics using the above-mentioned forming apparatus, first, a required amount of ceramic slurry S, which is a mixture of ceramic powder and water (distilled water), is supplied into the slurry tank 14. do. At this time, the on-off valve 45 on the slurry outlet 21 side is closed. While the slurry S in the tank 14 is stirred by the stirring means 15, the slurry S in the tank 14 is stirred by the vacuum pump 16.
While vacuuming the inside of the slurry S, the air bubbles contained in the slurry S are removed and discharged. After performing the defoaming operation in this manner, the operation of the vacuum pump 16 is stopped, the on-off valve 46 is closed, and the switching valve 23 is switched to be connected to the pipe line 22. and from the air pressure source 20 3
While supplying air at a low pressure of about Kgf/cm ² under pressure into the tank 14 through the pipes 22 and 19, the on-off valve 45
Open the slurry S in the tank 14 to the outlet 21
From there, it is sent out to the main pipe line 31 and branch pipe line 32. The slurry S sent to the main pipe line 31 passes through a filter 47 to remove impurities such as dust, and then enters the vertical through passage 48 inside the plaster mold 1, and from there enters the molding chambers 1a 1 of the divided molds 1a, _1b ... , 1a ₂ ..., respectively. At this time, the on-off valve 49 on the main pipe 31 side is opened, and the on-off valve 50 is closed. After injecting the ceramic slurry S into the plaster mold 1 in this way, close the on-off valve 45 on the tank side,
Then, the pump 33 connected to the pressurizing device 4 is activated to increase the oil pressure in the main container 24 to a pressure of, for example, 200 Kgf/cm ² , thereby contracting the bag body 25 and converting the slurry S in the bag body 25 into hydraulic pressure. By pressurizing to the same pressure, the same high pressure of 200 Kgf/cm ² is applied to the slurry S in the plaster mold 1 through the branch pipe line 32 and the main pipe line 31 for the required time. By applying such high pressure, the moisture in the ceramic slurry S in the plaster mold 1 is actively absorbed through the micropores of the plaster itself, the gaps between the joints of the divided molds, and even the gaps between the split molds of each divided mold. As the target is being excreted rapidly,
As the ceramic particles in the slurry are firmly bonded and compacted, the slurry solidifies in a short time to form a high-density molded body. Moisture discharged from the plaster mold 1 is received into the outer cylindrical member 11 on the outside through the small through hole of the cylindrical form 5, and is discharged to the outside through a drain port (not shown). In this case, the external cylindrical member 11 can be connected to a vacuum pump 16 via a conduit 51 and an on-off valve 52, and the operation of the vacuum pump 16 allows the external cylindrical member 11 to be connected as appropriate.
1 It is designed so that the air inside can be sucked out. Once the ceramics in the plaster mold 1 have solidified appropriately in this way, the mold support device 2 is removed from the plaster mold 1, the plaster mold 1 is disassembled into each divided mold, and the divided molds of each divided mold are further separated. They are separated from each other and the molded body is taken out.

(Effects of the invention) The pressurizing device of the invention has an extremely simple structure, and the bag body can be easily removed from the main container by removing the cap unit, making it easy to clean the bag body and the main container. Furthermore, even a small amount of ceramic slurry can be reliably pressurized to the desired pressure. Furthermore, since it has a slurry introduction pipe, it has the effect of preventing air from entering when slurry is introduced into the bag.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing the entire ceramic molding apparatus for carrying out the present invention, and FIG. 2 is a longitudinal cross-sectional view showing a pressurizing apparatus according to the present invention. S... Ceramics slurry, 1... Plaster mold (molding mold), 4... Pressure device, 24... Main container, 25... Bag body, 26... Cap unit, 27
... Slurry pressurization chamber, 28 ... Pressurization fluid chamber, 2
9...Slurry introduction pipe, 30...Air bleed valve.

Claims (1)

[Scope of utility model registration request] Inserting an inflatable bag into the main container, and sealing the mouth of the bag to the mouth of the main container via a cap unit that is detachably attached to the mouth of the main container. The inside of the bag is used as a slurry pressurizing chamber, and the space between this bag and the main container is used as a pressurizing fluid chamber, and the ceramic slurry to be pressurized is introduced into the slurry pressurizing chamber inside the mouthpiece unit. A slurry introduction pipe for pressurizing ceramic slurry is inserted so that its lower end extends close to the inner bottom of the bag body, and an air vent is provided to appropriately release the air in the slurry pressurizing chamber. Device.