SU1767321A1 - Low temperature continuous electric furnace for equipment - Google Patents

Abstract

SUMMARY OF THE INVENTION: The furnace has a casing, a heat-insulated chamber with a removable vault, mounted on the bottom guides for moving the equipment located along the side walls of the chamber, and devices for moving the equipment (O), heaters made in the form of individual metal plates (MP) with t gami and electric heating elements built into them and actuators moving the plates relative to each other, each of which is connected through a figured rail with rods and is located on one side of the chamber. Direct contact of heated MPs with O contributes to an increase in the efficiency of heat transfer due to thermal conductivity, since the warping effect is eliminated. The execution of the heater in the form of MP provides reliable contact with O. 1 Cp. f-ly, 3 ill.

Description

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The invention relates to foundry, in particular, to furnaces for curing rods in a heated tooling.

The known pass-through electric furnace for heating parts up to 470-770 K contains a casing, a finely insulated chamber with a removable vault and installed heaters located along the side walls of the chamber with heated screens, upper and lower heated gas blasting boxes, devices for forced air circulation, doors and devices to move the snap. A distinctive feature of the furnace is that, in order to increase the uniformity of metal heating, the upper heated ducts are connected to the lower gas-jet ducts, and the lower heated ducts

connected to the upper hollow ridges formed by the steel screen and the walls of the lining.

The disadvantages of the furnace are a significant temperature difference between the gas medium and the material being heated, the temperature unevenness in the zones of the chamber. The furnace has large overall dimensions of the heat-insulated chamber, inefficient heat transfer by convection from the heaters to the heated material is used.

The purpose of the invention is to improve the quality of processing by providing contact heating equipment.

This goal is achieved by the fact that a low-temperature pass-through electric furnace for heating a snap-in comprising a casing, a heat-insulated chamber with

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removable vault and floor guides for moving the equipment, heaters located along the side walls of the chamber and devices for moving the equipment has heaters made in the form of separate metal plates with drafts and electric elements built into them, and the plate movement drives are relatively different each other, each of which is connected through a figured rail with bars of plates and is located on one side of the chamber.

In order to reduce energy losses, the above-mentioned furnace has a drive placed on the casing.

FIG. 1 shows the proposed furnace; in fig. 2 is a section A-A in FIG. 1; in fig. 3 shows a section BB in FIG. one.

The furnace has a casing 1, a thermally insulated chamber 2 with a removable vault 5, mounted on the bottom guides 3 and a device 4 for moving the equipment. The heaters are located along the side walls of the chamber and are made in the form of separate metal plates 7 with heating elements 8 embedded in them. Drives 10 moving the plates relative to each other are connected through a figured rail 11 with tgs of 9 plates. The rake moves along the guide rollers 12. When the rail is pressed on the squeeze roller 13, which is connected to the thrust 9, the plate 7 is depleted and the spring 14 is compressed. The spring is held by a washer 15 and a nut 16 in the housing 17 attached to the furnace shell. The slab 7 on the side of the furnace lining has a thermal insulation coating 18.

The heating equipment, which is the same in size, is combined into a unit that is cyclically pushed through the furnace.

The operation of the furnace. The fittings are fed to the guides 3 by the device 4. Approach to the block, connects with it and further pushes together with the block. Before the tool 10 is moved by the actuator 10, the figure rail 11 is moved and the plates 7 are removed from the tooling. The same thing happens simultaneously on the other side.

ovens. At the end of the movement of the tooling unit, the device 4 and the figure rail return to their original position. Springs 14 return plate 7 and pressing them to the snap. This provides contact heating. A snap out of the oven is removed by a special mechanism (not shown).

Test samples of equipment and plates

showed that the core box with dimensions of 250 x 250 x 200 mm was heated to a temperature of 540 Kz 90 minutes, an electric heater of 2.8 kW installed in the stove, and the temperature difference between the drawer and the heated plate

did not exceed 10 degrees. Temperatures are stable, easily adjustable. There is no local overheating of the box, which is important in the process of obtaining sand cores from thermoactive mixtures, which

at temperatures above 570 K decompose with the release of phenol and formaldehyde.

The calculation shows that at a working temperature of 520 - 550 K and a warm-up time of 90 minutes, the power consumption of the proposed furnace will be 50 kW, and in a known electric kiln through passage - 140 kW.

Claims (2)

1. Low-temperature pass-through electric furnace for heating the equipment, comprising a casing, a heat-insulating chamber with a removable vault and floor-mounted equipment guides, heaters located along the side walls of the camera, and a device for moving the equipment, characterized in that improving the quality of processing by providing contact heating of the equipment, the heaters are made in the form of separate metal plates with rods and with heating elements embedded in them, and drives for moving the plates relatively each other, each of which is connected through a figured rail with t gami plates placed on one side of the chamber. 2. Electric furnace according to claim 1, characterized in that, in order to save electricity, the drives are placed on the casing. i rci- -iTv i N 40) CN CO G-CD f -f if "five 41I ... I A J 6-6 Figz 7 5