SU420475A1 - WORM PRESS FOR PROCESSING POLYMER MATERIALS - Google Patents

Description

;one

The invention relates to the processing of polymeric materials on screw presses.

A worm press for processing polymeric materials is known, which contains a working cylinder equipped with a cooling funnel, having on the outer surface separated between by heating and cooling zones, a worm, a forming head and a humidified compressed air supply system.

In the design of the worm press, each cylinder cooling zone is divided by horizontal ribs that do not reach the partitions, into interconnected chambers and connected to a humidified compressed air supply system that includes electrically operated valves for periodic compressed air supply and water diffusers connected to a manifold for feeding them with water, electrically operated valves and cylinder cooling zones. Thanks to this, the cooling effect is enhanced. As a sprayer, standard nebulizer sprayers can be used, for example, type B 44-2 with additionally built-in needle valve floats to maintain a constant level of incoming water.

In addition, in order to use the secondary heated water, the collector for feeding the nozzles with water is connected to the cooling cavity of the feed hopper. FIG. Figure 1 shows schematically the described press with a cooling system; in fig. 2 — one cylinder heating and cooling zone; in fig. 3-5 - water sprayer, cut; in fig. 6 is a block diagram of automatic control of the temperature of a single cylinder zone with induction heating and air cooling.

The press contains a cylinder 1, a forming head 2, a screw to 3, a feed hopper 4 with a cooling cavity. On the cylinder are the coils 5 induction heaters. Between the inner diameter of the roller and the broken surface of the cylinder there is a cavity into which air is supplied to cool the zone. The cylinder is divided into four heating and cooling zones, each of which has two heating coils separated by a ring 6 with inlet and outlet openings for cooling air. The heating and cooling zones are divided by partitions 7. Each cylinder cooling zone for a better distribution of humidified air over the surface is divided by two horizontal ribs 8, not reaching the partitions, into two interconnected chambers. Compressed air from the line is supplied to each cylinder cooling zone through a solenoid valve 9, for example, SKN-2, bypass valve 10 and water remover 11. Valve 10 serves to manually control the cooling of the zone and adjust the press to its operation. mode. The compressed cooled air, after leaving the cooling zones, enters the collector through pipes, from which it is discharged into the sewage outlet through a diluent. For powering sprayers 11, secondary heated water is used from the cooling cavity of feed hopper 4, which enters the collector 12, and then through pipes to each of the sprayers, which use a standard sprayer type B 44-2 (pneumatic system oil sprayer). A device is additionally built in for him to continuously feed it with water and maintain a constant level. The rammer 11 contains a spray bushing 13, a cork 14, a housing 15, a throttle 16, a cup 17, a tube 18, a hinge 19, a cork 20, a tube 21, a cap 22, a nut 23, a needle valve 24 and a float 25. The presses heat up the cylinder and head zones, while the charge zone is continuously cooled with water. When the desired temperature is reached at the zopa, the measuring and adjustable device 26 from the thermocouple 27 disconnects the heater coils 5 through the starter 28 and due to the slight inertia of the heaters from the same device turns on the solenoid valve 9, while the bypass valve 10 should be closed. When the solenoid valve is opened, the compressed air from the line enters the dispenser 11 and, mixed with the sprayed water, enters the cylinder cooling cope and then after taking heat from the cylinder into the sewer drain. When the temperature of the heating zone drops to the preset value, the device 26 shuts off the solenoid valve and the air supply stops. Thus, the air for cooling the zone is supplied only at the moment of overheating of the ZOP and for a very short time due to rapid heat extraction. The spray water 11 operates as follows. Compressed air from the line is fed into the atomizer through the orifice a and is divided into several streams. The main pogook is directed to the outlet b through the slits c, and the rest through the holes r and (. When the throttle 16 is fully open, the pressure in the tank (cup 17) and A are the same, resulting in a clearance: .1, and does not occur During throttling, the pressure in cavity A becomes less than in the reservoir, as a result of which water rises up to tube 18, depresses ball 19 and enters tube 21. As in zone B of the nebulizer, after pressure gap, a pressure decrease occurs, the water is drawn out of tube 21 goes through the bore The small diameter of the spray sleeve 13 is sprayed in a stream of compressed air. More heavy particles are deposited on the surface of the water in the tank, and light ones due to a local decrease in pressure in zone B (after slots c) along with the air flow pass to the outlet hole in the housing. When it enters the main air flow, water is subjected to secondary spraying, and air is mixed into the cooling cavity with the tiniest sprayed water. When the water level in the tank (tank 17) is lowered, the float 25 is lowered and the needle valve 24 opens water to the tank. When filling the tank to a certain level, the float floats up and the needle valve closes the access to water. Adjustment of the degree of air saturation with water is made individually for each sprayer with the help of throttles 16. Subject of the invention 1. A screw press for processing polymeric materials containing a cylinder equipped with a feed funnel with a cooling cavity, having on the outer surface divided between each other by heat, cooling and cooling partitions to the forming head and the supply system of humidified cooling compressed air, characterized in that, in order to increase the cooling effect, each cooling zone The cylinder is divided by horizontal ribs that do not reach the partitions into interconnected chambers and is connected to a humidified cooling compressed air supply system that includes electrically controlled valves for periodically supplying compressed air and water diffusers connected to a collector for watering them with electrically controlled valves. and the cooling zones of the cylinder. 2. The press according to claim 1, characterized in that standard nebul-system nebulizers are used as nebulizers, for example, type B 44-2 with additionally built-in floats with needle valves to maintain a constant level of incoming water. 3. The press according to claim 1, characterized in that, in order to use the secondary heated water, a collector for filling the nozzles with water is connected to the cooling cavity of the feed funnel.

22

sixteen

one

fU2.5

Fig.c