JPS5837629Y2 - Screw or rotor with carbide pin attached to the top of the flight - Google Patents

Description

[Detailed description of the invention] This invention prevents gaps from forming between the flights of the synthetic resin screw or rotor and the cylinder due to wear of the flights, which reduces the shearing capacity and crosstalk handling capacity of the synthetic resin. It concerns a screw or rotor with a carbide pin attached to the top of the flight.

Additives mixed into synthetic resins include pigments (carbon,
titanium white, etc.), fillers (tankal, talc, asbestos, aluminum hydroxide, etc.), reinforcing materials (glass fiber, carbon fiber, etc.), iron oxide, ferrite, etc., and these are mixed in and processed by uniaxial extrusion. When kneading is performed using a machine, a twin-screw continuous kneader, a twin-screw continuous extruder, a batch kneader, or the like, wear occurs on the cylinder or screw side of each machine.

In particular, the top portion of the flight from the compression section of the screw and rotor to the melting section is severely worn.

This creates a gap between the cylinder and the top of the flight.
The synthetic resin material and additives to be kneaded escape through this gap.

Therefore, it becomes impossible to apply shear due to the rotation of the screw or rotor to these synthetic resin materials and additives.

In other words, the dispersion of additives in the synthetic resin deteriorates, and the throughput of the crosstalk device decreases.

Generally, as a countermeasure against this problem, induction hardening, hard chrome plating, or stellite overlay is applied to the flight tops of screws and rotors. There is no other way to do it other than to give it a veneer.

However, when overlaying Stellite, due to the high heat,
If the screw becomes bent, various repair processes such as re-bending are required, which costs a lot of money and takes a lot of time.

The present invention was developed in view of these circumstances, and its structure is extremely simple, and moreover, when it wears out, it can be easily replaced on-site. .

This will be explained with reference to the diagram.

1 is the cylinder, 2 is the screw or rotor, and 3 is its flight.

A large number of pins 5 made of a material harder than the base material of the flight 3 are attached to the flight top 4 of the flight 3 at intervals of 0 to 20 mm.

6 indicates the field from the supply section to the compression section, and 7 indicates the field from the compression section to the melting section.

8 is rotor flight.

Install pin 5 as follows.

The distance between the flight top 4 and the cylinder 1 is set in advance by 0.5 to 2.
Leave a gap of about 0 mm, use a pin 5 that is slightly shorter than the length of this gap and a diameter smaller than that of the flight section, and, for example, drill a hole slightly thicker than the diameter of the pin 5 in the flight top 4, and insert it into the hole. Drive the pin 5 into the hole, or cut a screw into the hole and screw it into place, and then pour in silver solder to prevent it from coming out.

If the screws and rotors of a single-screw extruder or a twin-screw extruder are fully meshed, it is sufficient to simply drive or screw the pins 5 into each other.

Further, the pin 5 can also be formed by a rod of an irregular shape.

Since the present invention is constructed in this way, even if the pin wears out, it is possible to immediately replace it, and since the replacement work is easy, it is not necessary to take it to the processing factory. There is no need for repair, and it can be easily replaced on site, minimizing costs and processing time.

If the dispersion of additives deteriorates or the processing capacity decreases even slightly, countermeasures can be taken immediately, improving the efficiency of the equipment and increasing its capacity.

[Brief explanation of drawings]

Figure 1 is a longitudinal side view of the flight, Figure 2 is a side view of the single-screw extruder screw, Figure 3 is its cross-sectional side view, Figure 4 is a side view of the rotor of the two-shaft continuous mixer, and Figure 5. is a cross-sectional side view thereof. 3...Flight, 4...Top of flight, 5...Pin.

Claims (1)

[Scope of utility model registration request] A screw or rotor in which a large number of pins 5, which are harder than the flight 3 base material and smaller in diameter than the width of the flight 3, are attached closely to the flight top 4, and carbide pins are attached to the flight top.