Continuous heat treatment device

Abstract

The invention discloses a continuous heat treatment device which aims at providing a continuous heat treatment device mainly focusing on powdery or small grain materials. The invention has the advantages of low energy consumption, high utilization rate of workshop resources, easiness in operation, utmost reduction of pollution, even temperature of heat treatment of materials, meeting the requirement of air isolation in heat treatment of materials without protective air, meeting the requirement for special atmosphere in heat treatment of materials, even atmosphere and low air consumption. The device comprises a feeding device, a blanking tube, a heating device and a discharge device; the feeding device, the heating device and the discharge device are respectively positioned at the upper part, the lateral side and the lower part of the blanking tube; the feeding pipe is vertically arranged; the heating device can continuously heat the blanking tube and materials in the tube; the feedingdevice can continuously feed materials to the blanking tube; the blanking tube helps the materials to move downwards along the blanking tube under self gravity; the discharge device can continuously discharge the materials in the blanking tube; the blanking tube includes an air inlet pipe and a gas distributing device; one end of the air inlet pipe is connected with the gas distributing device, and the other end is provided with an opening out of the blanking tube. The invention mainly focuses on heat treatment to powdery or small grain materials.

Description

technical field [0001] The present invention relates to a heat treatment device, more specifically, it relates to a continuous heat treatment device mainly for materials mainly consisting of powder or small particles. Background technique [0002] At present, there are mainly two types of heat treatment devices for materials mainly composed of powder or small particles, tunnel kiln and pit furnace. Above-mentioned two kinds of heat treatment devices have their respective advantages but all there are quite a lot of obvious deficiencies. Analyze them separately below: [0003] As a heat treatment device for materials mainly composed of powder or small particles, the tunnel kiln has the advantage of continuous production and a certain scale of production capacity. But it has many shortcomings that are difficult to overcome: 1. The utilization efficiency of workshop area and space is low. Tunnel kilns generally occupy an area of ​​more than 100 square meters, and due to the h...

AI Technical Summary

Problems solved by technology

However, there are many shortcomings that are difficult to overcome: 1. The utilization efficiency of workshop area and space is low

Tunnel kilns generally occupy an area of ​​more than 100 square meters, and because the device is too heavy, due to the consideration of installation, maintenance and heat dissipation, the space above the tunnel kiln is almost unusable, so the utilization efficiency of workshop resources is not high

2. Large one-time investment

Tens of tons of self-weight consume a lot of steel and refractory materials, complex automatic control systems, a large number of heating elements, thermometers and hydraulic propulsion systems are expensive, which lead to a one-time direct investment of tunnel kilns ranging from hundreds of thousands of yuan to millions of dollars

3. High maintenance cost

In most cases, the heating element of the tunnel kiln is directly exposed to the volatile atmosphere of the material, so its service life is generally not high; at the same time, when it is moved into the board and sagger for a long time, it is also damaged from time to time and needs to be replaced in time ;The sagger carrying the material is stacked on the moving-in board, and it is easy to overturn during the moving-in process in the kiln. If it is not discovered in time and handled properly, it is easy to cause arching. Once arching occurs, the kiln must be opened to deal with it. All of the above lead to high maintenance cost of tunnel kiln

4. High energy consumption

The kiln body is huge and there are many air leakage points, a large number of porous materials such as furnace bricks are used and the airtightness is poor, and the design of the replacement chamber for entering and exiting the kiln leads to the tunnel kiln often requiring a large amount of protective gas, and the purity of the protective gas is high.

6. For materials that require a special atmosphere during heat treatment, because the position of the material in the sagger and the position of the sagger in the moving plate are different, the diffusion resistance of the gas is also different, so it cannot meet the requirements of the material during heat treatment. The requirement for uniform distribution of special atmosphere, and similar to the above reasons, the amount of special gas is more

7. Troublesome operation and much pollution

But its shortcomings are also obvious: 1. Intermittent operation, not continuous production, low production capacity

The furnace can only be taken out of the heating furnace after the furnace has cooled to a certain temperature; the material can only be taken out of the furnace after the material has cooled to a certain temperature; the above reasons lead to a long production interval, which affects the production capacity , not conducive to mass production

2. Low thermal efficiency

In each production process, the heating of the furnace by its heating device is also ineffective heating, and there is a waste of energy

3. The highest temperature experienced by the material or the time of staying at the highest temperature is uneven

4. Troublesome operation and more pollution

Because the materials need to be taken out from the furnace, and most of the furnaces are in the form of deep wells, the operation process is troublesome and full of dust, so there are also situations in which the operator has a large workload and is not conducive to the health of the operator.

5. Since the material is basically in a static state in the furnace, and the distance between the material and the inlet point varies greatly, the well-type furnace cannot meet the requirements of uniform distribution of the special atmosphere during the heat treatment process of the material.

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