JPS6141249B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a stirring device used in applications where powder such as high alumina and a small amount of liquid binder are added and the stirring and forced extrusion into the cavity of a mold are performed continuously. It relates to an extruder, and consists of a case body whose inner surface is formed into an inverted conical shape and an extrusion port is provided at the lower end, and a case lid attached to the upper opening of the case body,
Insert a freely rotatable drive shaft into the center of the case lid,
Attach a fixed gear concentric with the drive shaft to the bottom of the case lid, and align the center line S with the center line SL of the case body.
A revolving bracket in which a planetary gear having a central axis passing diagonally between one side and the inner circumferential wall of the main body and facing the vicinity of the extrusion port is meshed with a fixed gear, and the central axis is fixed to a drive shaft. A circular plate is supported rotatably on its own axis, a circular plate is fixed to the central axis, and the circular plate is extended to the vicinity of the extrusion port at an eccentric position of the circular plate, and is constituted by the center line SL of the case body and the inner circumferential wall of the case body. It is characterized by being equipped with a stirring extrusion screw that rotates together with a disk while revolving together with a planetary gear in space, and is capable of stirring and extruding a dough such as hardened clay using strong pressure. The purpose is to provide equipment.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, 1 is a case body whose inner surface is formed into an inverted conical shape, and a small diameter extrusion port 2 is provided at the lower end. The case body 1 is provided with a short cylindrical part 3 in the upper part,
A mounting collar 4 is provided on the outer periphery of the upper mouth of the cylindrical portion.

Reference numeral 5 denotes a cup-shaped case lid which is brought into contact with the mounting collar 4 of the case body 1 and whose lower end is bent down in contact with the outer periphery of the cylindrical shape 3, and has a boss portion 6 projecting to the upper and lower surfaces in the center. A drive shaft 1 is provided at the center of the boss portion.
A shaft hole 7 through which 0 passes, a square-shaped pressurized air supply port 8 opening at the lower surface of the eccentric portion of the boss portion 6, and an air blowout port 9 are provided. A drive shaft 10 is passed through the shaft hole 7, and a first suction hole 11 opening on the lower surface of the shaft 10 and a second suction port 12 formed in the radial direction are provided. A dust filter 15 on which a microporous dust collecting plate 14 is mounted is fixed to a perforated plate 13 so as to be freely exchangeable. A ring 16 having a large number of radial holes 17 communicating with the air outlet 9 is tightly fitted around the second suction port 12, and thrust bearings 18 are provided above and below the ring 16, and the lower part is mechanically fitted. A seal 19 seals the drive shaft 10 .

At the lower end of the boss portion 6 is a gear 2 concentric with the drive shaft 10.
0 and a saucer-shaped baffle plate 21 that repels the air blown from the lower end opening of the air supply port 8 and guides it upward. Further, a planetary gear 22 having a center shaft 23 is meshed with the gear 20. The centerline S of the planetary gear 22 and the center shaft 23 passes diagonally through the center of the centerline SL of the case body 1 and the inner circumferential wall toward the vicinity of the extrusion port 2, and 22 is a bevel gear type. The center shaft 23 is attached to the outer periphery of the lower end of the rotating shaft 10 and is supported to freely rotate by passing through the shaft support 25 of the bracket 24 that revolves. A second baffle plate 27 forming an annular slit 26 is fixed between the rotary disk 28 and a rotary disk 28 immediately below the bracket 24 of the central shaft 23. Fix the stirring extrusion screw 29.

The screw 29 has a length extending to the vicinity of the extrusion port 2, and is an annular space formed around the center line S of the central axis 23 by the center line SL of the case body 1 and the inner circumferential wall of the body. It is configured to rotate on its own axis while drawing a conical locus at part F, and the end near the extrusion port 2 is shaped to rotate so as to coincide with the center line S.

Planetary gear 22, rotating disk 28 and screw 2
9 are provided in a pair separated by 180 degrees as shown in the figure. Each screw 29 is formed by twisting a flat steel like a threaded rod.

To explain the operation of this embodiment, a powder such as high alumina powder and an appropriate amount of binder, or a raw material 32 pre-mixed externally, are poured into the case body 1 by removing the case lid 5, and then as shown in the figure. After attaching the case lid 5 and fixing it with screws 30, insert the screw 29 into the raw material 32, and then open the air supply port 8.
Pressurized air is introduced to further suppress dust, and the closed-circuit feed pipe 31 that communicates with the extrusion port 2 and the cavity of the molding die is temporarily closed. Since the binder is not used in large quantities to cause significant stickiness in the high alumina, dust will fly up inside the case body 1, but as mentioned above, the pressurized air sent from the air supply port 8 will not reach the arrow line. The dust passes through the gap between the rotary disks 28 and 28 to the upper surface of the raw material 32, suppressing the rising dust, and passing through the dust filter 15 → the first suction port 11.
→ second suction port 12 → hole 17 → air outlet 9 and is discharged to the outside. On the other hand, pressurized air enters around the planetary gear 22 surrounded by the baffle plate 21 and the second baffle plate 27 through the annular slit 26 and maintains the planetary gear 22 at a high pressure to prevent dust from entering. When the feed pipe 31 is opened after rotating for a certain period of time and the screw 29 has thoroughly stirred the raw material 32, it is found that the inner surface of the case body 1 is an inverted conical shape and that the planetary gear 22 is By rotating the central shaft 23 while revolving around the gear 20, the screws 29, 29 attached to the eccentric part of the rotating disk 28 attached to the central shaft 23 apply a strong thrust to the raw material 32 and extrude it from the extrusion port 2. It is extruded into the feed pipe 31 and the cavity of the mold is filled with high density. The extrusion pressure is 7Kg/cm ² . Therefore, even if the mixed raw material 32 coming out of the extrusion port 2 has such plasticity that it can be grasped by hand and barely solidified, the purpose of filling and molding is achieved.

The above is just an example of the hydrated state of the extrusion raw material, and it goes without saying that it can also be applied to stirring extrusion of materials that produce clay-like viscosity just by stirring. Further, it is also possible to provide a device for continuously or intermittently supplying raw materials into the case body 1 without removing the case lid 5.

As clarified from the above description, the present invention has an inverted conical inner surface, and a planetary gear that revolves around a gear fixed concentrically with the drive shaft in the inner space and rotates on its own axis. Rotate the screw that is almost in contact with the extrusion port at the bottom of the case body,
The thrust of the screw increases as it goes downwards due to the inner shape of the case body, and the screw is pushed out from the extrusion port with a strong thrust.
It goes without saying that the screw, which revolves and rotates together with the planetary gear, has the ability to stir the raw material inside the case body. For this reason, by press-fitting the agitated raw material extruded from the extrusion port 2 into the mold cavity through a closed circuit, it is possible to perform molding with a high packing density, and it is most suitable for molding ceramic substrates. It has the effect of obtaining.

[Brief explanation of the drawing]

The accompanying drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of the central portion, and FIG. 2 is a plan view taken along the line A--A in FIG. 1. 1 → case body, 2 → extrusion port, SL → center line,
F → space, 4 → mounting collar, 5 → case lid, 6 → boss, 10 → drive shaft, 20 → gear, S → center line,
22 → Planetary gear, 24 → Bracket, 28 → Rotating disc, 29 → Screw.

Claims (1)

[Claims] 1 Consists of a case body whose inner surface is shaped like an inverted cone and an extrusion port provided at the lower end, and a case lid attached to the upper opening of the case body, with a freely rotatable drive shaft inserted through the center of the case lid. , Attach a fixed gear concentric with the drive shaft to the bottom surface of the case lid, and direct the center line S toward the vicinity of the extrusion port by diagonally passing between one side of the center line SL of the case body and the inner circumferential wall of the body. A planetary gear having a central axis is provided in mesh with a fixed gear, the central axis is rotatably supported by a revolving bracket fixed to a drive shaft, a disk is fixed to the central axis, and the eccentric position of the disk is fixed. We installed an agitating extrusion screw that extends to the vicinity of the extrusion port and that rotates with the disk while revolving with the planetary gear within the annular space formed by the center line SL of the case body and the inner peripheral wall of the case body. Characteristic stirring extruder.