CS241909B1 - Polyamide and polyethylene hoses hot forming device for helices - Google Patents

Abstract

The device according to the invention is solved production of plastic twisted hoses into a flexible spiral. These the hose is used to feed or drain the work media on moving machine parts. Depending on the training material used, it can be hose helix used for pressure or vacuum lines, or for heating or cooling the chemical bath.

Description

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for the thermoforming of polyamide and polyethylene hoses into helices and to the production of a flexible coil hose. Such hoses are used for supplying or discharging working medium with overpressure or underpressure in moving parts of machines.

Until now, the working medium was supplied by a loose hose or a steel foil under which the hose rolled according to the movement of the machine part. In these methods of supplying the media, the inlet hoses were not shaped, but it was necessary to attach the hoses to the auxiliary brackets and guiding foils and secure them against being caught and damaged. The hitherto known production methods or hose shaping devices are for example according to U.S. Pat. AO 192147, where it is used to mold a hose of a hollow plastic mandrel with a supply of pressurized and coolant, and the outer shape of the hose is formed in closed shaped jaws. Other AO 122338 of the GDR uses a device for shaping the ends of plastic hoses and tubes to form a sealing element. This shaping is carried out by means of plastic collars.

A disadvantage of the aforementioned devices is their size and limited movement in the distance of the mutually moving parts. Another disadvantage is easy damage of the loose loop of the hose, its entanglement and eventual breaking or pinching. The disadvantage of production equipment for tube forming according to MS. AO 182147 is a small length of shaped hose that is limited by the length of the shaped jaws and is practically shaping rectangular arcs or parts thereof, and is therefore unsuitable for forming a flexible coil hose. Another device according to AO 122338 - NJR only shapes the end of the hose for the sealing element and is unusable in case of a flexible coil hose.

The above drawbacks are overcome by a device for thermoforming polyamide and polyethylene hoses, characterized in that the winding cylinder is hollow with cooling holes located outside the winding section, wherein there are clips at the beginning and end of the winding section for fastening the winding hose, the winding axis of the rollers forms an angle of 84 ° to 88 ° with the axis of the guide die and at this angle the hose is fed to the winding roller through the guide die, which is simultaneously adjusted by the brake to tensile stress of 0.4 t 0.2 MPa. The winding roller is made of material

241 909

of good thermal conductivity and resistant to temperature shocks from 250 ° C to 3 ° C without embrittlement, cracking and deformation.

The main advantage of the device according to the invention is its simplicity and reliability in operation. At the beginning of the winding, the shaped hose is fastened to the winding roll by a clip, and at the next winding it is biased both by the tension tension created by the die brake and by the angle of the winding roller axis and the die axis. The coiled hose is subjected to a heat shock with cooling on the cylinder. Another advantage is the very low cost and simple operation after adjustment. The formed hoses processed to the device according to the invention have a perfect helix shape and are freely stretched in the direction of the helix axis with minimal sagging as required. By ensuring the helical shape stability on the device, the disadvantage of damaging the hose by crushing or breaking in service is also eliminated, and furthermore, it is possible to substantially increase the distance of the mutually moving parts. Another advantage is the use of such treated hoses on the device according to the invention for the purpose of heating chemical baths up to temperatures of about 80 ° C or for cooling.

The figure shows a plan view of a device for thermoforming polyamide and polyethylene hoses. The device consists of a base plate 11 with hinged supports 12 of a hollow take-up roll on which cooling holes 2 are located outside the take-up part 3 of the take-up roll 2 on which the clips 6 are fixed at the beginning 4 and at the end Ei of the take-up part 3. 2 of the winding cylinder 1 forms an angle of 84 ° to 88 ° with the axis 8 of the guide die 9 and under this angle the hose 10 is supplied to the winding part by a constant tensile stress of 0.4 to 0.2 MPa produced by the guide die 9. 13. The hose 10 is clipped at the beginning 4 of the take-up part 3 and after the entire take-up part 3 has been filled, the hose 10 is again attached by a clip 6 located at the end 5 of the take-up part 3. the hose 10 on the winding portion 13 is in a continuous tension bias. The so-wound take-up roller 1 ' ^is removed from the tilting supports 12 and placed in a drying oven for heating. It is then quenched in cold water. The clamps 13 are unscrewed and the hose 10 is removed from the take-up roller 1.

Claims (3)

SUBJECT OF THE INVENTION 241 909 A device for thermoforming polyamide and polyethylene hoses into a helix comprising a support of a winding roll on a base plate and a winding roll, characterized in that the winding roll (1) is hollow, with cooling holes (2) located outside the winding part (3) wherein at the beginning (4) of the take-up part (3) and the end (5) of the take-up part (3) there are clips (6) of the hose (10), the axis (7) of the take-up roller (1) clamping with the guide axis (8) The die (9) has an angle of 84 ° to 88 ° for guiding the hose (10) at this angle to the take-up roller (1), wherein the guide die (9) is simultaneously a brake adjusted to a tension tension of 0.4 to 0.2 MPa. Device according to claim 1, characterized in that the winding roller (1) is made of a thermally conductive material resistant to temperature shocks from 250 ° C to Low: 14 ° C.