Electric heating device for improving temperature uniformity of section of roller kiln

Abstract

The utility model discloses an electric heating device for improving the temperature uniformity of the cross section of a roller kiln, and solves the technical problems that the temperature of the conventional direct-insertion type I-shaped electric heating pipe or U-shaped electric heating pipe in the width direction of the kiln is not uniform, and the temperature difference exists between the two sides of an inner cavity and the middle of the kiln due to heat dissipation of outer walls on the two sides of a kiln body. The device is characterized in that the ceramic rods wound with the resistance wires are arranged in the length direction of the kiln, the temperature is controlled in multiple groups in the width direction of the kiln, the heating elements are hung on the heating wires on the upper portions of the roller rods through insulation hanging pieces, the heating elements are placed on the heating wires on the lower portions of the roller rods through groove type insulation materials, and binding posts are led out of the kiln top and the kiln bottom respectively; and the upper heating wire of the roller is convenient to maintain and replace. A good electric heating arrangement mode is provided for the roller kiln, compared with other electric heating wire arrangement modes, the temperature uniformity of the section of the kiln is greatly improved, the production efficiency is greatly improved, the production cost is saved, and the electric heating device can be widely applied to the electric heating roller kiln.

Description

Technical Field

[0001] The utility model belongs to the field of thermal technology, and particularly relates to an electric heating device for improving the temperature uniformity of a roller kiln cross section. Background Art

[0002] The heating method of the electric heating roller kiln is generally up and down heating by rollers. A porcelain tube carrying a resistance wire is inserted into the furnace from one side of the furnace wall. The entire electric heating wire is arranged horizontally in the furnace. Since the heat dissipation on both sides of the furnace and the middle of the furnace is different, this involves the problem of reducing the temperature difference in the width direction of the kiln.

[0003] Currently, the existing direct-insert I-type electric heating tubes or U-type electric heating tubes have uneven temperatures in the kiln width direction, and there is a temperature difference between the two sides of the kiln body and the middle of the kiln, which leads to uneven products in the same cross-section, seriously affecting product quality and pass rate. Summary of the invention

[0004] The utility model aims to provide an electric heating device for improving the temperature uniformity of the roller kiln cross section, which has the advantages of uniform temperature in the furnace, improved production efficiency, reduced maintenance cost and improved product quality.

[0005] The technical scheme of the utility model is as follows: it comprises a roller kiln body steel structure, a kiln wall, a kiln bottom, a removable light kiln top, rollers, a heating device and an automatic control device. The heating device adopts electric heating method to heat the upper and lower sides of the rollers of the roller kiln, and the porcelain tubes wound with electric heating wires are evenly distributed along the length direction of the kiln body and are automatically controlled in groups.

[0006] Furthermore, the upper electric heating device is composed of components such as an upper electric heating wire, an insulating hanger, an upper porcelain tube, an insulating hanger hardware and an upper terminal. The electric heating wire is wound on the upper porcelain tube. The insulating hanger hardware passes through the center hole of the insulating hanger and then passes through the kiln top. It is fixed to the kiln top by a nut. The two ends of the upper porcelain tube wrapped with the electric heating wire are placed at appropriate positions on the hooks on both sides of the insulating hanger. The upper electric heating wire is led out from the kiln top through the upper terminal and connected to the power supply. The lower electric heating device is composed of a lower electric heating wire, a lower porcelain tube, a groove-shaped insulating part and a lower terminal. The groove-shaped insulating part is laid on the kiln bottom along the length of the kiln. The lower porcelain tube wrapped with the lower electric heating wire is placed in the long groove of the groove-shaped insulating part. The lower electric heating wire is led out from the kiln bottom through the lower terminal and connected to the power supply.

[0007] Furthermore, the upper heating wires and the lower heating wires are arranged in groups of 3 to 12 in the kiln width direction, and the temperature in the kiln is controlled by an automatic control device.

[0008] The beneficial effects of the utility model are: since the electric heating wires are changed from the traditional lateral distribution of penetrating the furnace from the kiln wall to the cluster arrangement along the length direction of the kiln body and controlled in groups, the temperature in the width direction of the furnace can be effectively adjusted and the temperature difference in the cross section of the kiln can be reduced. It has the advantages of uniform temperature in the furnace, improved production efficiency, reduced maintenance costs, improved product quality, etc., and can be widely used in various types of roller kilns.

[0009] The utility model will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0011] Figure 2 It is a schematic diagram of the main cross-sectional structure of the utility model.

[0012] In the figure: 1 is a removable light kiln roof, 2 is an upper electric heating wire, 3 is an insulating hanger, 4 is an upper porcelain tube, 5 is an insulating hanger hardware, 6 is a groove-type insulating part, 7 is a lower porcelain tube, 8 is a lower electric heating wire, 9 is an upper terminal, 10 is a lower terminal, and 11 is a roller. Implementation

[0013] Take the construction of an 80-meter roller kiln as an example. The kiln is 2 meters wide and has a pitch of 2 meters. It is composed of a kiln steel structure, a kiln roof, a kiln wall, a kiln bottom, rollers, a heating device, and an automatic control device. The heating device is heated by electric heating above and below the rollers 11 of the roller kiln. The porcelain tubes wrapped with electric heating wires are evenly distributed along the length of the kiln body and are automatically controlled in groups. The upper electric heating device is composed of an upper electric heating wire 2, an insulating hanger 3, an upper porcelain tube 4, an insulating hanger hardware 5, and an upper terminal 9. The electric heating wire 2 is wrapped around the upper porcelain tube 4. The insulating hanger hardware 5 passes through the center hole of the insulating hanger 3 and then passes through the kiln roof 1 and is fixed on the kiln roof by a nut. The two ends of the upper porcelain tube 4 wrapped with the electric heating wire 2 are placed on the hooks on both sides of the insulating hanger 3. The upper electric heating wire 2 is led out from the kiln roof through the upper terminal 9 and connected to the power supply. The lower electric heating device is composed of a lower electric heating wire 8, a lower porcelain tube 7, a groove-shaped insulating member 6 and a lower terminal 10. The groove-shaped insulating member 6 is laid on the kiln bottom along the kiln length direction. The lower porcelain tube 7 wrapped with the lower electric heating wire 8 is placed in the long groove of the groove-shaped insulating member 6. The lower electric heating wire 8 is led out from the kiln bottom through the lower terminal 10 and connected to the power supply. The upper electric heating wire 2 and the lower electric heating wire 8 are divided into a group of 3 to 9 wires in the kiln width direction, and the temperature in the kiln is controlled by an automatic control device. In the implementation of the utility model, since the electric heating wire is carried on the porcelain tube and fixed on the kiln top and the kiln bottom together, the kiln top can be uncovered, which is convenient for the inspection and replacement of the electric heating wire. The bottom of the furnace is built with groove-shaped insulating bricks to fix the electric heating wire. In the kiln width direction, the upper and lower electric heating wires are controlled in 3 groups. When a certain temperature point in the kiln width direction is lower than the process temperature, the electric heating at this point will automatically increase the heating power, otherwise it will reduce the heating power, so that the temperature of the cross section in the furnace is kept uniform. The utility model has the advantages of uniform temperature in the furnace, improved production efficiency, reduced maintenance cost, improved product quality, etc., and can be widely used in various types of roller kilns.

Claims

1. An electric heating device for improving the temperature uniformity of a roller kiln cross section, comprising a roller kiln body steel structure, a kiln wall, a kiln bottom, a removable light kiln top (1), a roller (11), a heating device and an automatic control device, characterized in that: The heating device is a device that uses electric heating to heat the upper and lower parts of the roller rod (11) of the roller kiln. The porcelain tubes wrapped with electric heating wires are evenly distributed along the length of the kiln body and are automatically controlled in groups. The upper electric heating device is composed of an upper electric heating wire (2), an insulating hanger (3), an upper porcelain tube (4), an insulating hanger hardware (5) and an upper terminal (9). The electric heating wire (2) is wrapped around the upper porcelain tube (4). The insulating hanger hardware (5) passes through the center hole of the insulating hanger (3) and then passes through the kiln top (1). It is fixed to the kiln top by a nut. The two ends of the upper porcelain tube (4) are placed on hooks on both sides of the insulating hanging member (3), and the upper heating wire (2) is led out from the kiln top through the upper terminal (9) and connected to the power supply; the lower electric heating device is composed of a lower heating wire (8), a lower porcelain tube (7), a groove-shaped insulating member (6) and a lower terminal (10), the groove-shaped insulating member (6) is laid on the kiln bottom along the kiln length direction, the lower porcelain tube (7) wrapped with the lower heating wire (8) is placed in the long groove of the groove-shaped insulating member (6), and the lower heating wire (8) is led out from the kiln bottom through the lower terminal (10) and connected to the power supply.

2. The electric heating device for improving the temperature uniformity of the roller kiln cross section according to claim 1, characterized in that: The upper heating wires (2) and the lower heating wires (8) are arranged in groups of 3 to 12 in the kiln width direction, and the temperature in the kiln is controlled by an automatic control device.

Images