JPS5845851Y2 - Carbon rod extrusion molding equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a piston-type extrusion molding device that molds a carbon rod by extruding a mixture of carbon powder and a binder from a nozzle under pressure, and particularly relates to a piston-type extrusion molding device for molding carbon rods for dry batteries. This relates to an extrusion molding device, and by providing a taper holder having a plurality of twisted blades that intersect with each other in the axial direction in the constriction section at the tip of the extrusion molding machine, the material that is separated from the twisted blades and extruded intersects with each other. In addition to ensuring strong adhesion, the molded carbon rod is oriented at an angle to the extrusion direction to prevent cracks or cores from forming in the molded carbon rod.

Conventionally, carbon rods for dry batteries are obtained by extruding a mixture of carbon powder such as graphite or coke and kneading it with a binder such as tar pitch into a circular rod shape, then firing it and waterproofing it with paraffin, etc. It was getting worse.

In piston type extrusion molding equipment used for this type of application,
The mixture of carbon powder and binder was pre-compressed into a cylindrical shape to facilitate the operation when feeding it into an extrusion molding machine.

When this preload surface is molded using an extrusion molding machine, the joint between the preload surfaces may be extruded and cracks may occur in the molded carbon rod, or the offshore center may be formed at the constriction part near the nozzle of the molding machine. Since the flow is different between the center and the outside, there is a drawback that a large amount of cored particles with different densities are generated between the center and the outside.

Since such cored materials have high gas permeability, they have been a major cause of leakage when used in carbon rods for dry batteries.

The present invention has been made to eliminate the above-mentioned drawbacks, and will be explained below based on drawings showing embodiments thereof.

In Figures 1 to 3, 1 is a cylindrical cylinder, and the rear end of this cylinder 1 is provided with an opening for receiving a preloaded surface preloaded by kneading carbon powder and a binder, and the tip thereof is A constricted portion 2 is formed in which the inner diameter becomes smaller toward the tip, that is, the constricted portion 2 has a concave shape.

3 is a piston that is slidably movable within the cylinder 1;
An extrusion portion 4 that contacts the inner peripheral wall of the cylinder 1 is provided at its tip, and the other end is connected to a power source (not shown).

Reference numeral 5 denotes a nozzle nozzle attached to the tip of the constriction part 2 of the cylinder 1, and inside thereof there is provided a taper-shaped taper holder 6 connected to the taper of the constriction part 2, and a cylindrical nozzle 7 connected to the taper holder 6. The inside of the cap 7 serves as a nozzle 8.

The taper holder 6 is formed with two torsion blades 9, 9' that intersect with each other in the axial direction.

In this molding machine, when molding a preloaded product in which a mixture of carbon powder and a binder is preloaded into a cylindrical shape, two torsion blades 9 and 9' are provided on the tapered holder 6 and intersect with each other in the axial direction. Therefore, the flow of the material to be molded is changed by the two torsion blades 9 and 9', and the torsion blade 9
, 9' occurs.

As a result, the objects to be molded intersect with each other and the orientation is at an angle to the extrusion direction, resulting in uneven flow between the center and the outside, which can cause cracks. , it does not become cored, and it is possible to eliminate the defects caused by the orientation parallel to the extrusion direction.

It is best to use two blades 9, 9' intersecting each other in the axial direction as in the above embodiment, but even if there are three or more blades, the same effects as in the above embodiment can be obtained.

In this way, the tapered holder 6 at the tip of the molding machine is equipped with blades 9 that intersect with each other in the axial direction so that a molded product with the flow of the raw material at an angle to the extrusion direction is obtained.
, 9', the molded carbon rod is oriented as shown in Figure 4 a, and is not oriented parallel to the extrusion direction like the conventional product shown in b, so when used as a carbon rod for dry batteries. , the permeation of the electrolyte is extremely small, and even if it does permeate, the permeation speed in the vertical direction is extremely low.

As described above, according to the present invention, since the tapered holder at the tip of the molding machine is provided with a plurality of twisting blades that intersect with the axial direction, it is possible to provide a carbon rod having an angle to the extrusion direction. In addition, the carbon rod becomes resistant to leakage as a carbon rod for dry batteries.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an extrusion molding device showing an embodiment of the present invention, Fig. 2 shows a taper holder, where a is a sectional view, b is a front view, and Fig. 3 is the inside of the taper holder. FIG. 4, a perspective view showing the structure, shows the orientation state of the extrusion-molded carbon material, where a shows a molded carbon rod according to the present invention and b shows a conventional molded carbon rod. 1... Cylinder, 2... Throttle part, 3
... Piston, 5 ... Base nozzle, 6
...Taper holder, 9゜9'...
Twisted feathers.

Claims (1)

[Scope of utility model registration request] A cylindrical cylinder with an opening at the rear end to receive a preloaded surface preloaded by kneading carbon powder and a binder, and a concave constriction at the tip, and a cylindrical cylinder at the tip of the constriction. a piston that is inserted into the cylinder from the rear end opening of the cylinder and pushes out the preloaded surface to the mouth nozzle while crushing the preload surface; 1. A carbon rod extrusion molding device characterized by being provided with a taper holder having: