SU707657A1 - Tube expanding apparatus - Google Patents

Description

(54) DEVICE FOR FLAMMABLE PIPES

one

The invention relates to the distribution of pipe diameter by pressure treatment.

A device for dispensing pipes is known, having a rod, on the end of which a mandrel is fixed, made in the form of a cylinder with a guide cone or a solid ring 1.

Since the pipe is dornified when the rods move forward, the rods with mandrels attached to the ends work in compression, and due to the large length (1500 mm) and small diameter (20 mm) of rods used in the dornirovany pipes (convector heaters according to GOST 20949-75 ), the phenomenon of buckling occurs. The rods are quickly worn out.

It is also known a device for dispensing pipes, comprising a displacement driven slider, a rod mounted in the slider with a collet collar at the end and an expandable mandrel mounted with a conical shank that interacts with the mandrel 2 that is axially displaceable.

But when dividing the pipe, the outer diameter of the mandrel is worn out, which results in

To reduce the pipe diameter, and, consequently, to the poor-quality fixing of the fins on the convector heater pipes. Due to the allowable GOST difference in the wall thickness of the pipe, its diameter changes during the section, which leads either to poor fixing of the fins, or to a pipe break and an unjustified increase in drive power.

The purpose of the invention is to improve the quality of distribution.

Claims (2)

The goal is achieved by the fact that the known device is equipped with a mechanism for controlling the outer diameter of the pipe during dispensing, electrically connected with the drive for moving the slide, KotopOM has a through hole and an axially displaceable rod in it, while the unclamping mandrel is equipped with a flange, and the slide - adjusting plug, placed in the hole and limiting the movement of the mandrel, as well as a spacer spring placed between the flange of the mandrel and the end face of the rod. FIG. G shows a general view of the device; in fig. 2-section A-A of FIG. 1. The device consists of a slider 1, to which a rod 2 is secured. The shoulder of the rod 2 slides in the opening of the slider I and is pressed against the slider by a spring 3. The spring 3 also presses the flange of the mandrel 4 to the adjusting plug 5. At the end of the rod 2 a collet mandrel 6 is installed, which is placed in the tube 7 of the convector heater with the fins 8. The pipe 7 rests on one side against the stop 9, and on the other against the stop 10, which has an opening, equal to the outer diameter of the mandrel, in which the core 2 is placed. In the zone of the beginning of distribution (beginning of the bend of the pipe 7), the mechanism of controlling the outer diameter of the pipe 7 is arranged, made in the form of two levers II, on one shoulder of which are installed the prisms 12, and on the other - the limit switch 13 and the adjusting screw 14. The levers 11 are arranged to rotate around the axis 15. The device operates as follows. Type the fin package 8. Slider 1 is moved forward, which inserts rod 2 with collet mandrel 6 into pipe 7. The pipe is not dispensed because the outer diameter 6 is equal to the inner diameter of pipe 7. When mandrel 6 reaches the bend of pipe 7, it stops No. and PSW continues to move forward , with its adjusting plug 5 onto the mandrel 4, the mandrel 4, compressing the spring 3, enters the conical opening of the mandrel 6 with its conical part and expands it, increasing the outer diameter of the pipe -7. The latter presses on the prisms 12, ikakonly on} the euzhny diameter of the pipe 7 reaches the required value, the bolt 14 presses the end switch 13, and the slider 1 starts moving backwards. The pusher 4 is held in the hole of the collet mandrel b by force that has arisen on the conical part of the pusher 4 from the force of the mandrel, and the slider captures the rod 2 by its collar and there is no sweat back. The pipe 7 is dispensed. As soon as the mandrel b comes out of the tube 7, the dornification force will disappear and, therefore, the force that held the pusher 4 in the tapered hole of the mandrel 6 will disappear and spring 3 will release and pull the mandrel 4 from the mandrel 6 until it stops at the stopper 5 The finished heater of the convector is removed and the cycle is repeated again. Adjusting plugs 5 make debugging at the simultaneous start of dorne by both mandrels 6, and adjusting screw 14 sets the size of the outer diameter of the mandrel pipe 7. The invention A device for dispensing pipes containing a displacement driven slide, a rod installed in a half with a collet at the end and an axially displacing mandrel mounted in a rod with a possibility of axial movement with a conical tailing, which interacts with a mandrel, characterized in that, in order to increase the quality of distribution, it equipped with a mechanism for controlling the outer diameter of the pipe during dispensing, electrically connected with the drive for moving the slide, and a through hole is made in the slide and a rod is axially displaced in it, while the expansion mandrel is flanged and the slide is fitted with an adjusting plug installed in chamfered hole and limiting the movement onpapjcH, as well as a spacer spring, placed between the flange of the mandrel and the end face of the rod. Sources of information taken into account in the examination 1. Proskurkov Yu. G. Strengthening-calibrating processing methods. M. .. Machining, 1965, p. 92 2. USSR author's certificate in application number 2183505, 1975 (prototype).