JPH0517007B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an extruder used for extrusion molding hollow ceramic products such as insulators and insulator tubes.

(Prior Art) For extrusion molding of hollow ceramic products, an extruder is used in which a core metal called a sink metal for forming the inner diameter is arranged in the center of an extrusion drum. The extrusion drum and sink metal of this extruder need to be replaced as appropriate with ones that are sized according to the outer and inner diameters of the ceramic product to be extruded. Even when the parts could be separated, they were interconnected with dozens of bolts, requiring an extremely long time to replace them. In particular, since the sink metal is provided inside the extrusion drum, there is the inconvenience that the extrusion drum must first be disassembled even when only the sink metal needs to be replaced.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and provides an extruder in which the extrusion drum, sink metal, etc. can be disassembled and connected in a short time. It was perfected for the purpose of

(Means for Solving the Problems) The present invention, which has been made to solve the above-mentioned problems, has an extrusion drum and a sink metal inside the extrusion drum at a primary side and a secondary side at almost the same cross-sectional position near the tip of the screw shaft. It is characterized in that it is divided into two sides, and a connecting claw and a clamping claw that engage with the core metal and drum of the other side are respectively provided at the connecting portion between the extrusion drum and the sink metal.

(Example) Next, the present invention will be described in more detail with reference to illustrated examples.

In FIG. 1, 1 is the first screw shaft for pushing out the clay introduced from the hopper 2;
4 is a vacuum chamber for deaerating gas such as air from the clay extruded by the first screw shaft 1, and 4 is a second screw shaft for extrusion molding the degassed clay. 5 is an extrusion drum that determines the outer diameter of the hollow ceramic product to be extruded, and 6 is a sink that is installed inside the extrusion drum 5 and determines the inner diameter of the hollow ceramic product.

In the present invention, the flow metal 6 includes a relatively thin primary core metal 7 fixed to the tip of the second screw shaft 4 at a position several hundred mm away from the tip of the second screw shaft 4; It is divided into an exchangeable secondary side core metal 8 whose thickness corresponds to the inner diameter of the ceramic product. As shown in FIGS. 2 and 3, a hydraulic cylinder is used to radially expand the joint of either the core metal 7 or the core metal 8 (the core metal 8 in the embodiment). A plurality of connecting claws 9 are provided. Each connecting pawl 9 can move in and out along a guide 10, and the inside thereof is connected to a metal fitting 14 of a piston rod 13 of a hydraulic cylinder 12 via a link 11. Therefore, when the piston rod 13 is in the solid line position shown in FIG. 2, each connecting pawl 9 is expanded outward and engages with the inner surface of the other core metal 7. Also, piston rod 13
moves to the position shown by the imaginary line, each connecting claw 9
is drawn to the center by the link 11 and disengaged from the other core metal 7. This hydraulic cylinder 12 is structured so that hydraulic pressure can be supplied from the outside via a hydraulic cable 15 when necessary. Note that 16 is a spring for forcibly returning the piston rod 13 when the hydraulic pressure is released.

Therefore, when it is desired to change the inner diameter of a hollow ceramic product to be extruded, by supplying hydraulic pressure to the hydraulic cylinder 12 via the hydraulic cable 15, each connection provided at the joint of one core bar 8 can be changed. Claw 9
can be pulled toward the center and disengaged from the other core metal 7 from the outside of the extrusion drum. In this state, pull out the secondary side core metal 8 from the primary side core metal 7,
Similarly, a new secondary side core bar 8 with the connecting claw 9 drawn to the center by hydraulic pressure is inserted into the primary side core bar 7. Thereafter, when the hydraulic pressure is removed from the hydraulic cylinder 12 of the new secondary core metal 8, each connecting pawl 9 expands outward due to the action of the spring 16 and engages with the inner surface of the primary core metal 7. The sink money 6 can be integrated.

Further, as shown in FIG. 4, the extrusion drum 5 is also divided into a primary drum 17 and a secondary drum 18 at approximately the same cross-sectional position as the sink 6. and one of the drums (drum 17 in the example)
A plurality of clamp claws 19 are provided on the outer circumferential surface of the connecting portion of
is provided. This clamp claw 19 can be rotated, for example, 180 degrees by a small hydraulic rotor 20, and its tip is connected to the other drum 1.
By engaging with the flange 21 of No. 8, the primary drum 17 and the secondary drum 18 can be connected to each other. Furthermore, if hydraulic pressure is supplied in the direction of reversing the hydraulic rotor 20, the plurality of clamp claws 19 rotate in unison and disengage from the flange 21 of the other drum 18, so that The side drum 18 can be easily removed.

Therefore, the secondary drum 18 can be changed in a short time to match the outer diameter of the ceramic product to be extruded, without removing or tightening dozens of bolts as in the conventional method. becomes possible.

Moreover, in the present invention, since the extrusion drum 5 and the sink metal 6 are divided into the primary side and the secondary side at almost the same cross-sectional position, the extrusion drum 5 and the sink metal 6 are divided into the primary side and the secondary side at almost the same cross-sectional position. It is convenient to exchange 5 and the sink money 6 at the same time. That is, first, as described above, remove the secondary side of the extrusion drum 5,
Next, a method can be adopted in which the secondary side of the sink metal 6 is replaced and then a new secondary side of the extrusion drum 5 is attached. In this way, the secondary sides of the extrusion drum 5 and the sink metal 6 can be made into sets according to the molding type, and can be replaced as a set from the same cross-sectional position.

(Effects of the Invention) As explained above, according to the present invention, the sink metal can be disassembled and connected from the outside of the extrusion drum in a short time, and it is possible to remove and tighten a large number of bolts as required in the past. The extrusion drum can be easily disassembled and connected without having to do anything, and since the extrusion drum and the sink metal are each divided into the primary side and the secondary side at almost the same cross-sectional position, the extrusion drum sink metal and It is extremely convenient to convert molded products at the same time, and the time required to change molded products can be greatly shortened. Therefore, the present invention greatly contributes to the development of industry as an extruder that eliminates the problems of the conventional extruder.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a sectional view showing the connection part of the sink metal, and Fig. 3
This figure is a sectional view taken in a direction perpendicular to FIG. 2, and FIG. 4 is a sectional view showing the connection between the extrusion drum and the sink metal. 5: Extrusion drum, 6: Sink metal, 7: Primary side core metal, 8: Secondary side core metal, 9: Connecting claw, 17: Primary side drum, 18: Secondary side drum, 19: Clamp nail.

Claims (1)

[Claims] 1 The extrusion drum 5 and the sink metal 6 inside it are divided into a primary side and a secondary side at approximately the same cross-sectional position near the tip of the screw shaft 4, and the extrusion drum 5
An extruder characterized in that a connection claw 9 and a clamp claw 19 that engage with a core metal and a drum on the other side are respectively provided at the connecting portion between the metal core metal and the sink metal 6.