JPS6220261Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a rubber pellet manufacturing device that pelletizes raw rubber.

In recent years, stimulated by the pelletization of plastics, the rubber industry has also begun to pelletize, pneumatically transport,
Automation of weighing etc. has become advantageous,
Rubber pellet production equipment that produces relatively large rubber pellets has come into use. That is, the first
As shown in the figure, reference numeral 1 is a screw extrusion type rubber pellet manufacturing device, and the tip of a cylinder body 2 has a cutter portion 3 equipped with a rotary cutting blade for cutting raw rubber. This is the driving part. The tip of the cylinder body 2 is equipped with an extrusion mouthpiece 5 as shown in FIG. 2, in which a large number of small holes 6 are provided, and the raw rubber extruded through the small holes 6 is cut by a rotating cutting blade. and begins to form pellets.

However, in the above-mentioned rubber pellet manufacturing apparatus, when the raw rubber extruded from the small hole 6 is cut by the rotary cutting blade, the raw rubber has adhesiveness, so especially when the viscosity is relatively high. However, the pellets have the disadvantage that they are not completely cut into pellets, and the pellets form tails, and the tails stick together with adjacent pellets, resulting in large lumps.

This invention was devised in view of such circumstances,
The purpose of the present invention is to provide a structure for a rubber pellet manufacturing apparatus that can smoothly cut raw rubber even when the raw rubber has a high viscosity. A rubber pellet manufacturing device that extrudes rubber pellets and cuts them into rubber pellets using a rotating cutting blade has a mouthpiece holding fitting that holds the extrusion nozzle by pressing the extrusion nozzle against the cylinder side, and the mouthpiece holding fitting is attached to the surface of the extrusion nozzle. The upper half of the cylindrical projection has a plurality of shower holes vertically connected to the shower pipe, and an extension part is provided at intervals from the shower hole. A shower structure in a rubber pellet manufacturing apparatus is provided, in which an arc-shaped contact plate is fixed to a die holding fitting and has a tapered surface facing toward the surface of the extrusion die and toward the center of the extrusion axis with a gap between the surface of the extrusion die and the extrusion die. And so.

The present invention will be explained below based on FIGS. 3 and 4. Rubber pellet equipment can produce raw rubber 10
The extrusion pressure P is constantly applied from the extrusion die 12 having a large number of small holes 11 to continuously extrude the rotary blade 1.
This is a device for cutting pellets into pellets.

The extrusion die 12 is set on the cylinder 15 side using a die holding fitting 16. Cap holder 1
6 has a cylindrical protrusion 16a that protrudes beyond the extrusion die surface 12a. A shower hole 18 connected to the shower pipe 17 is provided on the upper half side of the cylindrical protrusion 16a, and an arc-shaped tapered surface 19 is provided at the extension portion of the shower hole 18.
There is a contact plate 19 having a. This plate 19 is used to cause the aqueous solution showered from the shower hole 18 to flow down onto the extrusion die surface 12a.
It has the tapered surface 19a facing in the direction 2a and toward the center of the extrusion shaft. The outer peripheral side of this plate 19 is fixed to the cylindrical protrusion 16a, and the inner peripheral end has a gap A with the extrusion die surface 12a.

In this example, the extruder is a screw type extruder, but a ram type extruder may also be used. The cylinder diameter of this extruder is 250 mmφ, and the shower structure of the present invention can be used in relatively large rubber pellet manufacturing equipment.

The extrusion die 12 is disc-shaped and has a large number of small holes 11 of the same diameter evenly formed therein. Although the diameter of the small hole 11 is set to 20 mmφ, it is not limited to this. That is, it can be determined as appropriate depending on the use of the pellets, taking into consideration the extrusion speed, the number of revolutions of the rotary cutting blade, etc. Further, the extrusion mouthpiece 12 is fixed to the cylinder 15 side with bolts using a mouthpiece holding fitting 16, so that the extrusion mouthpiece 12 can be replaced.

In addition, the shower hole 1 connected to the wrinkle pipe 17
Although five numerals 8 are provided on the upper half side of the cylindrical protrusion 16a of the cap holding fitting 16, the number is not limited to five. In short, it is necessary that the aqueous solution showered from the shower hole 18 hits the contact plate 19 to form a wall of water so that the aqueous solution flows down over the entire surface of the extrusion die 12. Furthermore, to explain the aqueous solution, the aqueous solution may be just water, and in order to improve the cutting properties of the raw rubber and to prevent the pellets from sticking together after being cut into pellets, a silicone-based solution is added to the water. Emulsion is used, and it is generally showered with warm water (around 50 degrees Celsius).

Since the shower structure of the present invention is configured as described above, the aqueous solution showered from the shower hole 18 hits the contact plate 19, is dispersed on the tapered surface 19a of the contact plate, forms a water wall over a wide area, and is extruded. It flows down toward the extrusion nozzle surface 12a, and flows down from top to bottom over the entire extrusion nozzle surface 12a.
That is, the aqueous solution serves as a lubricant for cutting the extruded raw rubber 10 by the rotary cutting blade 13, and completely and smoothly cuts all of the raw rubber 10 extruded from the small hole 11 of the extrusion die 12. be able to. Furthermore, it is possible to prevent the rubber material from being heated when it is pressed by the rotary cutting blade 13 during cutting, and also to prevent the rubber materials from sticking together.

Furthermore, if the aqueous solution is made into a release agent solution containing a silicone emulsion or the like, it is effective to prevent the cut rubber pellets from sticking to each other over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram schematically showing a rubber pellet manufacturing device, Fig. 2 is a plan view of an extrusion die, Fig. 3 is a longitudinal cross-sectional view of an extrusion head portion explaining the present invention, and Fig. 4
The figure is a sectional view taken along the line of FIG. 10...Raw material rubber, 11...Small hole, 12...Extrusion die, 12a...Extrusion die surface, 13...
Rotary cutting blade, 15... Cylinder, 16... Cap holding fitting, 16a... Cylindrical protrusion, 17... Shower piping, 18... Shower hole, 19... Plate,
19a...Tapered surface, A...Gap.

Claims (1)

[Scope of utility model registration request] In a rubber pellet production device in which raw rubber is continuously extruded from a mouthpiece with many small holes and cut into rubber pellets by a rotating cutting blade, the extrusion mouthpiece is pressed against the cylinder side and a mouthpiece holding fitting is used to hold the extrusion nozzle. The cap holder has a cylindrical protrusion that protrudes outward from the surface of the extrusion cap, and the upper half of the cylindrical protrusion has a plurality of shower holes vertically connected to the shower piping. At the same time, an arc-shaped contact plate having a tapered surface facing toward the surface of the extrusion nozzle and toward the center of the extrusion shaft is attached to the extension part at a distance from the shower hole and fixed to the nozzle holding fitting. A shower structure in a rubber pellet manufacturing device characterized by being provided with a gap.