SU903066A1 - Portable apparatus for disassembling inteference-fit joints - Google Patents

Description

(54) PORTABLE DEVICE FOR DISASSEMBLY OF PRESS CONNECTIONS

one

The invention relates to mechanical assembly work, in particular to equipment for disassembling press joints, in which the end face of the female part is covered by a housing, for example, a gearbox or an electric motor.

A device for disassembling press joints is known, which contains an induction heater in the form of a coil of movable and stationary magnetic cores with ledges for the base of parts to be disassembled and inserts 1.

However, the known device does not provide uniform heating of the dismantled parts of complex shape, located in hard-to-reach places.

The aim of the invention is to provide uniform heating of dismountable parts of complex shape, located in hard-to-reach places, and increasing productivity.

This goal is achieved due to the fact that in a portable device for disassembly of press joints containing an induction heater in the form of moving and stationary magnetic conductors with ledges for the base of the parts to be disassembled and inserts, inserts are made in the form of sectional plates of non-magnetic material rigidly fixed on each moving magnetic conductor .

In addition, the pads on the side of the removed part are made of shaped in the form of magnetic circuits.

FIG. 1 shows a general view of the device in section; in fig. 2 - the same, top view.

The device contains an induction heater consisting of an induction coil 1, four fixed magnetic cores 2 with ledges for the base of parts and four moving magnetic cores 3. The induction coil and fixed magnetic cores are fixed on a circular plate 4 of electrically insulating material. The fixed magnetic cores have hinged bolts 5 with wing nuts for fastening and fixing the movable magnetic cores 3. On the lower planes of the movable magnetic cores there are rigidly fixed inserts 6 of a nonmagnetic metal,

20 for example copper.

The inserts 6 represent sectional overlays in the form of sectors, which from the side of the part to be disassembled are shaped in the form of moving magnetic cores 3. The plates are designed for current concentration and more intensive heating of individual sections of the female parts. Such a design, in combination with an induction coil, allows heating the female parts of various sizes and shapes to be heated, with the required unevenness along the axis and at a speed exceeding the speed of the shaft heating.

The induction coil 1 is located on four supports fixed on the plate 4 and is pressed against them with four straps 7. A disk 8 made of heat-resistant material prevents the plate 4 from heating by hot distance during the disassembly of the connections. The coil is protected from heat and damage by an annular shield 9.

Two handles 10 are used for lifting and transporting the device. The flexible cable 11 is connected via a terminal block 12 to the induction coil 1 to the power grid. The device is mounted on four supports 13.

To facilitate disassembly of joints

a screw puller 14 is used. The portable device and the puller are fixed on the flange part 15 to be dismounted by means of clamps (not shown).

The portable device for disassembling the press joints operates as follows.

Consider the disassembly of flange connections axial reducer teplovodov type TU. .

The small and large flanges 15 are located on both sides of the housing 16 of the gearbox and are associated with the shaft for a tight fit. The flanges are parts varying in thickness along the length and differ in configuration and dimensions. One of the ends of each flange is covered with a gearbox housing and bearings 17. Disassembly of flange connections, performed using a portable device, does not require dismantling of other parts and can be performed directly on a wheel pair assembled with a gearbox.

The portable device, together with the puller 14, is mounted and secured to the removable flange 15 by means of grippers. The ledges on the fixed magnetic cores 2 enter into the annular groove at the end of the flange disk and base the device relative to it. The movable magnetic cores 3 are mounted and bolted 5 to the fixed ones. After the magnetic system is closed, the flange is heated.

Due to the effect of the proximity effect of the roller, as well as the fact that the fixed magnetic circuits lock onto the end of the flange, its most massive part - the disk is heated first of all. The movable magnetic cores can only close to the flange radially, so the heating of the thin part occurs slowly, the shaft has time to warm up and disassemble the connection, it is not possible. Copper sectional plates (liners) significantly increase the heating rate of the thin part of the flange and allow the connection to be disassembled without damaging the flange and the shaft. By rotating the puller handle 14, the flange is removed from the shaft with a portable device.

Since sectional plates are installed on each movable magnetic core and the latter can move in the radial direction, the proposed portable device allows disassembling connections with flanges of various sizes and shapes without retooling.

The device can also heat the female parts before assembly. Lining and in this case increase the speed

5 heating and provide optimum temperature fields in details.

The expected economic effect from the industrial introduction of this device at the Murashinsky mechanical repair plant will be about 30 thousand rubles.

Claims (2)

1. A portable device for disassembling the press joints, containing an induction heater in the form of a coil of movable and stationary magnetic cores with ledges for the base of the parts to be disassembled and inserts, from 4 to ensure that 0 heating of dismountable parts of complex shape, located in hard-to-reach places, and increasing productivity, inserts are made in the form of sectional plates of non-magnetic material rigidly fixed on each movable magnetic conduit. 2. The device according to claim 1, characterized in that the pads on the side of the part to be disassembled are made in the shape of the magnetic circuits. Sources of information taken into account in the examination I. Application No. 2691572 / 25-27, cl. B 23 R 19/02, 04.12.78 (prototype).