JPH0420009Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention involves injecting ceramic powder into a slurry by dissolving it in water (hereinafter referred to as ceramic slurry) into a porous mold, such as a plaster mold. However, before the ceramic slurry is injected into the mold, before the ceramic slurry is injected into the mold, in order to manufacture a solid ceramic molded product while sucking out the moisture in the injected ceramic slurry through the pores of the plaster mold.
This device relates to a defoaming device for escaping and removing air bubbles in slurry that can cause defective products.In particular, it includes a slurry tank that stores the required amount of ceramic slurry, and a device that is inserted vertically into the slurry tank and is driven by a motor. a stirrer consisting of a rotating shaft and a plurality of stirring blades attached to the rotating shaft;
The present invention relates to a vacuum stirring type defoaming device equipped with a vacuum pump for sucking and discharging air inside a slurry tank.

(Prior art and its problems) Conventionally, in this type of defoaming device, the entire rotating shaft of the agitator is attached to and supported by the lid of the slurry tank, so it is difficult to remove the lid when cleaning the inside of the tank. Sometimes, it is necessary to take out the entire stirrer together with the lid, and as the device becomes larger to a certain extent, the weight increases accordingly, making it very difficult to remove and install the lid.

(Technical Means for Solving the Problems) In view of the above circumstances, the present invention provides a defoaming device that allows the lid of a slurry tank to be easily and easily removed. The technical means is that the tank body 1 of the slurry tank 14
4a in a fixed position, and a lid body 14b that is attached to the tank body 14a so as to be openable and closable.
The rotational shaft 27 is fixed to a required part of a rotating frame 32 that can be vertically pivoted about a horizontal support shaft 34, and a shaft portion 27a that is pivotally supported on the tank body side and a shaft portion 27b that is pivotally supported on the lid body side. At the same time, the lid body 14 is attached to both shaft portions 27a and 27b.
A shaft joint 29 is provided which is separated when the shaft 27b is opened, and a driving wheel 35 is attached to the horizontal support shaft 34 concentrically and relatively rotatably. It is characterized in that a winding transmission means 37 is stretched between the motive wheel 35 and the driven wheel 36.

(Example) Hereinafter, an example of the present invention will be described 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, a vacuum stirring type defoaming device 3 for removing air bubbles in the slurry S before injecting the ceramic slurry S into the plaster mold 1, and It includes a pressurizing device 4 for applying a high pressure of 10 to 250 Kgf/cm ² to the ceramic slurry S poured into the mold 1.

The plaster mold 1 has a truncated conical shape as a whole, and consists of upper and lower plaster molds 1a, 1b... Each of these divided plaster molds 1a, 1b... has a required molding chamber (cavity) inside. 1a ₁ , 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 includes a cylindrical mold frame 5 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. , a receiving plate 7 that receives the lower end surfaces of the plaster mold 1 and the formwork 5 fitted thereon via a packing 6; and a presser plate that is placed on the upper surfaces of the plaster mold 1 and the formwork 5 via a packing 8. 9, and a screw press 10 for pressing the plaster mold 1 supported on the receiving plate 7 and held in the formwork 5 through the presser plate 9, and the formwork 5 is A large number of small through holes (not shown) are provided that pass through the mold frame 5 in the thickness direction, and an outer cylindrical member 11 is covered around the outer periphery of the mold frame 5. 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, albeit slightly, and this compression causes the plaster mold 1 to bulge outward in the radial direction due to the taper action, and the outer peripheral surface of the plaster mold 1 is expanded into the mold 5.
At the same time, both upper and lower surfaces of the plaster mold 1 are brought into pressure contact with the inner circumferential surface 5a of the plaster mold 1 through the packings 8 and 6 by the holding plate 9 and the receiving plate 7,
This plaster mold 1 is fully supported from the outside. 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.

Next, the defoaming device 3 according to the present invention will be explained with reference to FIG. 1 and further to FIG. 2.
The slurry tank 14 consists of a tank body 14a and a lid 14b attached to the upper part of the tank so as to be openable and closable, and a stirring means 15 for stirring the ceramic slurry S supplied to the tank 14.
and a vacuum pump 16 for sucking out the air inside the slurry tank 14. Second
As is clear from the figure, the tank body 14a has a flange portion 17a provided on the outer periphery of its upper end supported by a required portion of the upper surface of the base 18 and fastened with bolts and nuts 19. It is fixed at a fixed position on the base 18. A flange portion 17b is provided around the outer periphery of the lower end of the lid body 14b,
When attaching to the tank body 14a, this flange portion 17b is attached to the flange portion 1 of the tank body 14a.
7a through a packing 20, and by tightening a plurality of clamps 21 interposed between these flange parts 17a and 17b, both flange parts 17a and 17b are integrally connected,
The lid body 14b is held and fixed in the closed position. Each clamp 21 has a bolt 22 pivotally attached to a flange portion 17a on the tank body side using a pin 23 so as to be able to freely rotate in the vertical direction, and a pair of bolts 22 on the flange portion 17b on the lid side so that the bolt 22 can be inserted between them. The support pieces 24, 24 are fixed, and when the lid is closed, the bolt 22 is rotated upward to remove the support pieces 2.
4 and 24, and a tightening nut 26 is screwed onto this bolt 22 via a washer 25 and tightened. In addition, stirring means 15
A rotating shaft 27 is arranged vertically in the center of the slurry tank 14, and a plurality of stirring blades 28 are provided radially from the rotating shaft 27 and protrude in multiple stages (for example, two stages) above and below. ..., and the rotating shaft 27 is a shaft portion 27 pivotally supported on the tank body 14a side.
a, and a shaft portion 27b that is pivotally supported on the lid body 14b side, and these both shaft portions 27a, 27
A shaft joint 29 that is separated when the lid body 14b is opened is interposed between the shaft joints b. The shaft portion 27a on the tank body side is supported by a support frame 30 that is removably attached to the tank body 14a.
1, and the shaft portion 27b on the lid side is rotatably supported by a shaft bearing 32 which is integrally fixed to the center of the lid 14b. And the bearing 3 fixed to the lid side
The upper end of 2 is connected to a horizontal support shaft 3 supported by a pedestal 33.
The frame 69 is integrally connected to the tip of a box-shaped rotating frame 69 which is pivotally attached to the frame 4 so as to be pivotable in the vertical direction. Further, a pulley 35 as a driving wheel is attached to the horizontal support shaft 34 so as to be relatively rotatable, and this pulley 35 has two adjacent belt grooves arranged in parallel, one groove and the other on the lid side. An endless belt 37 as a winding transmission means is wound around the groove of a pulley 36 as a driven wheel fixed to the tip of the shaft portion 27b of the 1) via another endless belt 39. Furthermore, as shown in FIG. 3, the shaft joint 29 is a pair of disc-shaped joint members fixed to opposite ends of the tank body side shaft portion 27a and the lid side shaft portion 27b with setscrews 40a and 40b. 41a, 41b, and engagement protrusions 42a, 42b protrude from opposing surfaces of these coupling members 41a, 41b. Rotation is transmitted by the side end surfaces of the two abutting against each other. Therefore, during the stirring operation, the rotation of the motor 38 causes the belt 39, the driving pulley 35, and the belt 37 to
and the shaft portion 27 on the lid body side via the driven pulley 36.
b is rotated, and this rotation of the shaft portion 27b is caused by the rotation of the shaft joint 2
9 and is transmitted to the shaft portion 27a on the tank body side to rotate the stirring blade 28. and,
When it is desired to open the inside of the slurry tank 14 for cleaning or inspection, each clamp 21 is unclamped, that is, each tightening nut 26 is loosened, and the bolt 22 is rotated downward and laid sideways. After that, when the swing frame 69 is lifted and turned upward about the horizontal support shaft 34 as shown by the arrow A in FIG. 2, the lid 14b is lifted and opened according to this turning operation. As a result, the lid side joint member 41b of the shaft joint 29 comes to be separated from the tank body side joint member 41a. Furthermore, by providing an abutment piece 43 at the base end of the rotating frame 69 and a stopper bolt 44 on the pedestal 33 side, the rotating frame 69 can be moved at a position where both 43 and 44 are in contact with each other as shown in the imaginary line in FIG. It is possible to appropriately limit the angle when turning upward.

On the other hand, the vacuum pump 16 is driven by a motor 45, and the air suction port 4 of the lid 14b of the slurry tank 14 is
Connected to 9. In addition, 50 is an air pressure source for pressurizing and supplying air at a low pressure of about 3 kgf/cm ² into the slurry tank 14 to send out the defoamed ceramic slurry S from the outlet 51 at the bottom of the tank body 14a. The air pressure supply line 52 is connected to an intermediate portion of the line 48 via a manual switching valve 53.

Further, each of the stirring blades 28 is screwed onto a mounting ring 55 that is fixed to the shaft portion 27a on the side of the tank body with a set screw 54, and the locking nut 5
By loosening the blade 6 appropriately, the mounting angle of the blade 28 can be adjusted as desired. Furthermore, the stirring blade on the lower stage side (particularly indicated by 28') is
The lower side portion 28a of the tank body 14a is cut off obliquely so as to substantially correspond to the shape (concave spherical shape) of the lower bottom portion of the tank body 14a.
The slurry at the bottom of 4a can also be sufficiently and effectively stirred. As is clear from FIG. 2, the outlet port 51 of the tank body 14a extends radially outward from the lowest bottom of the tank body 14a. Further, the lid 14b is provided with a viewing window 57 for inspecting the inside of the slurry tank 14.

The pressurizing device 4 has an inflatable bag 59 disposed in a high-pressure container 58 that can sufficiently withstand an internal pressure of 250 Kgf/cm ² or more, and a flexible tube for introducing slurry into the bag 59. 60 is inserted to the bottom, and ceramic slurry S is constantly introduced into the bag body 59 through the tube 60 from a branch pipe line 62 branched from the main pipe line 61 for slurry. A high pressure oil of 10 to 250 Kgf/cm ² is supplied into the sealed space 63 between the bag body 58 and the bag body 59 to be compressed until the pressure of the slurry S in the bag body 59 is balanced with the pressure oil. This allows the ceramic slurry in the main pipe 61 to be highly pressurized. Pressure oil is pump 6
4 to the required high pressure and the hydraulic pipe 65
It is supplied to the space 63 inside the high pressure vessel 58 through the air. Further, the distal end side of the main slurry pipe 61 passes through a filter 70 and passes through a vertical passage 6 inside the plaster mold 1.
Therefore, the ceramic slurry supplied from the main pipe 61 is distributed and injected from this vertical passage 66 into the respective molding chambers 1a ₁ , 1a _{2 .} . . of the divided molds 1 a , 1 b . It's becoming like that.

Next, a ceramic molding process using this molding apparatus will be explained.

First, a required amount of ceramic slurry S, in which ceramic powder and water (distilled water) are properly prepared and mixed, is supplied into the slurry tank 14.
At this time, the on-off valve 67 on the slurry outlet 51 side is closed. Then, the tank 14 is stirred by the stirring means 15.
While stirring the slurry S in the
6 is activated to absorb and discharge air in the tank 14. In this case, the air bubbles contained in the slurry S in the tank 14 are effectively removed and discharged by the stirring action of the stirring means 15 and the depressurizing action inside the tank 14 by the vacuum pump 16, and also by the stirring action. As a result, the slurry S is mixed even better.
After performing the defoaming operation in this way, the operation of the vacuum pump 16 is stopped, the on-off valve 68 is closed, and the switching valve 5
3 to be connected to the conduit 52. Then, while pressurizing air at a low pressure of about 3 kgf/cm ² from the air pressure source 50 into the tank 14 through the pipes 52 and 48, the on-off valve 67 is opened to transfer the slurry S in the tank 14 from the outlet 51 to the main pipe. line 16 and branch line 6
Send to 2. The chiller S sent to the main pipe 61 passes through a filter 70 to remove impurities such as dust, and then enters the vertical passage 66 inside the plaster mold 1, and from there flows into the molding chambers 1 of the divided molds 1a, 1b...
It is distributed and injected into a ₁ , 1a _{2 . .} . respectively. After injecting the ceramic slurry S into the plaster mold 1 as described above, the on-off valve 67 on the tank 14 side is closed, and the pump 64 of the pressurizing device 4 is activated to increase the oil pressure in the high-pressure container 58 to, for example, 200 kgf. /cm ² , thereby contracting the bag body 59 and pressurizing the slurry S in the bag body 59 to the same pressure as the hydraulic pressure. The same high pressure of 200 Kgf/cm ² is applied to S for the required time. By applying such high pressure, the ceramic slurry S in the plaster mold 1
The moisture is actively and rapidly discharged from the pores of the plaster itself, the gaps between the joints of the split molds, and the gaps between the split molds of each split mold, and the ceramic particles in the slurry are As a result of being firmly bonded and compacted, it solidifies in a short time and becomes a high-density molded product.

(Effect of the invention) According to the defoaming device of the present invention, when opening the lid of a slurry tank, the revolving frame is swung upward and the lid is automatically opened accordingly. When the lid is opened, the shaft on the lid side is separated from the shaft on the tank body, making it extremely easy to remove and install the lid when inspecting or cleaning the inside of the tank. There are great effects that can be achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic explanatory diagram showing the entire ceramic molding apparatus having a defoaming device according to the present invention, and FIG. 2 is an enlarged detailed vertical cross-section showing the defoaming device. 3 are perspective explanatory views of the shaft joint. S...Ceramics slurry, 1...Gypsum mold,
3... Defoaming device, 14... Slurry tank, 14
a... Tank body, 14b... Lid, 15... Stirring means, 16... Vacuum pump, 27... Rotating shaft,
27a...Shaft on tank body side, 27b...Shaft on lid side, 28...Agitating blade, 29...Shaft joint, 69...Swivel frame, 34...Horizontal support shaft,
35... Pulley (driving wheel), 36... Pulley (driven wheel), 37... Endless belt (wrapping transmission means), 3
8...Motor.

Claims (1)

[Scope of utility model registration request] A slurry tank for storing a required amount of ceramic slurry, a stirring means consisting of a rotating shaft inserted vertically into the slurry tank and driven by a motor, and a plurality of stirring blades attached to the rotating shaft, and the inside of the slurry tank. In the defoaming device, the tank body of the slurry tank is fixed in a fixed position, and the lid body, which is attached to the tank body so as to be openable and closable, is attached to a horizontal support shaft. It is fixed to the required part of the rotating frame that can be rotated vertically around the center.
In addition, the rotating shaft is divided into a shaft part supported on the tank body side and a shaft part supported on the lid side, and a shaft coupling is provided on both shaft parts, which is separated when the lid is opened. Further, a motive wheel is mounted concentrically and relatively rotatably on the horizontal support shaft, a driven wheel is attached to the shaft on the lid side, and a wrapped transmission means is stretched between the motive wheel and the driven wheel. A defoaming device for ceramic slurry for molding, which is characterized by being suspended.