SU996478A1 - Resistance heater - Google Patents

Description

(5) DEVICE FOR ELECTROCONTACT HEATING

one

The invention relates to the hardware industry and can be used for heat treatment of metal profiles.

Known electrocontact device containing fixed contacts and the system to press them to the moving product Cl.

A disadvantage of this device is the uneven wear of the elements. Q Due to the dry friction of the pair of contact parts, the unstable position of the moving article is created and the amount of uncontrolled co-coupling increases sharply, which leads to increased wear of the devices.

The closest in technical essence and effect achieved to the invention is an electrocontact device for heating products, containing a bath and upper clamping and lower current-supplying rows of rollers 23 located in it.

A disadvantage of the known device is to stop the rollers when the product is insufficiently pressed, and this leads to increased wear of the device due to dry friction. During the expansion of the rollers, a stationary arc arises, which causes electro-erosion of the contact element and the workpiece. The device is designed in such a way that it requires bending of the processed product, and this is unacceptable in the case of hardened products, and is intended for heat treatment of products of a certain length.

The aim of the invention is to improve the contacting and facilitate the filling of the profile product.

Claims (2)

This goal is achieved by the fact that in the device for electric heating, containing the bath and located in it are offset relative to each other, the upper pressure and lower current-carrying rollers. the lower current-carrying rollers are supplied with drives. FIG. 1 shows the electrocontact device, top view; in fig. 2 shows section A-A in FIG. one; in fig. 3 section bb in fig. 1. A device for electrocontact heating of billets comprises an electrically insulating base 1, on which a bath 2 is installed, filled with water. In the bathtub, the clamping rollers 3 with the vertical movement mechanism and the lower current-carrying rollers k are placed, which are rigidly mounted on the shafts 5 to which current is supplied through the spring-loaded elastic current supply system 6. The shafts 5 are connected through a gear unit 7 and an electrically insulating clutch 8 with a drive 9. The bath 2 with running water has a sluice chamber 10. The device works as follows. The product 11, for example a wire, passes through the lock chamber 10 onto the current-carrying rollers k and presses them with upper pressing rollers 3. The elastic current lead 6 is electrically connected to one pole of the power supply. In the same way, product P passes through the second device, where the elastic current lead 6 is connected to the opposite pole of the power supply. The wire moving between the upper and lower rollers is heated by the current passing through the product. The upper pinch rollers, moving vertically, set the amount of product clamping to the lower current lead rollers. The lower driving current-conducting faces provide for the supply of an electric current of great power to the heated product (wire) that is pulled across the device by any known method. In the process of drawing the wire through the device, the drive 9 reports rotational motion by the current lead, whose linear speed is Freak The point of contact with the wire in absolute value is not. equal to the linear velocity of the wire I VpoA N 1, Rotation; the turning of current-conducting rollers can be both towards and in parallel with the movement of the heated wire. In both cases, the relative slip of the wire through the current-carrying rollers takes place. This ensures mutual cleaning of the contact surfaces, which allows for reliable electrical contact between them and eliminates the appearance of an arc at the Contact Point. In addition, due to the fascination of the product with rotating rollers, the convenience of refueling is improved. . The current-carrying rollers and the product 11 are in a bath 2 with water, which, filling the capillary gaps on the contact surfaces of the wire and current-carrying rollers, through the process of film micro-hopping, contributes to the intensive removal of particles of dirt and forming scale from the contact zone, which increases reliability of electrical contact without arcing. The medium (water) also reduces the mechanical wear of .con-, the clocking surfaces of the current-carrying rollers, which increases the service life of the latter. The use of this device makes it possible to improve the contact between the product and the rollers, eliminate the occurrence of an arc at the point of contact, improve the conditions for filling the product, and increase the reliability of contact without sparking and electroerosion. Claims An apparatus for electrical heating, containing a bath and located in it, upper pressure rollers and lower current-carrying rollers, which are offset relative to each other, are characterized in that, in order to improve contact and facilitate the filling of the product, the lower current-carrying rollers are equipped with drives. Information sources,. taken into account during the examination 1. USSR author's certificate tf, cl. From 21 D 1/40, 1968. 2. USSR author's certificate number 361205, cl. C 21 D 1LO, 19639 of. /