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Method for controlling flame brazing machine

A technology of flame brazing and control methods, applied in the direction of manufacturing tools, welding equipment, auxiliary devices, etc., can solve the problems of slow change in line speed, low production efficiency, and no fundamental improvement in flame quality, and achieve stable control of welding quality , The control logic is simple, the effect of improving the flame quality and stability

Inactive Publication Date: 2012-08-01
MIDEA GRP CO LTD
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Problems solved by technology

This kind of flame brazing equipment improves the welding quality by monitoring the temperature change and adjusting the speed of the welding line. However, the quality of the flame has not been fundamentally improved, the change of the line speed is quite slow, and the production efficiency is relatively low.

Method used

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  • Method for controlling flame brazing machine
  • Method for controlling flame brazing machine
  • Method for controlling flame brazing machine

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] see figure 1 , the control method of this flame brazing machine comprises the following steps:

[0040] Step 1, power on and initialize; that is to say, the flame brazing machine is powered on and reset, and the flame brazing machine initializes the system.

[0041] Step 2, the user sets the parameters, the parameters include the preset air-fuel ratio Rs and the deviation r, and the preset combustion temperature Ts and the deviation t.

[0042] The user presets the welding parameters, mainly the preset air-fuel ratio Rs and deviation r, the preset combustion temperature Ts and deviation t, the fixed ratio of combustion gas flow rate x, the gas flow rate fixed ratio y and the running time N.

[0043] The preset combustion temperature Ts varies according to the type of welded heat exchanger, and is determined according to actual experience, such ...

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Abstract

A method for controlling a flame brazing machine comprises the following steps: 1, a machine is started up and initialized; 2, a user sets parameters, wherein the parameters comprises preset air-fuel ratio Rs and deviation r as well as preset combustion temperature Ts and deviation t; 3, a fire is set to burn, and the operation lasts M minutes; 4, flow rates of combustion-supporting gas and fuel gas are detected through a flow sensor, and the actual air-fuel ratio R is calculated; 5, the actual air-fuel ratio R and the preset air-fuel ratio Rs are compared, and when the value of Rs minus r is equal to or less than R and R is equal to or less than the value of Rs plus r, the step 6 is carried out, and when the situation above does not exist, an air-fuel ratio regulation subprogram is operated first, and then the step 4 is operated; and 6, the actual combustion temperature is detected through a temperature sensor. The method provided by the invention has the characteristics of flexibility in operation, accuracy in temperature control, good flame quality, small variation in combustion temperature, and high welding quality.

Description

technical field [0001] The invention relates to a control method of a flame brazing machine, in particular to a control method of a flame brazing machine for batch welding heat exchangers. Background technique [0002] At present, the traditional flame brazing machine for welding heat exchangers is generally in the open-loop control mode, which is manually adjusted. Generally, after setting the parameters, it is no longer easy to adjust. The flame temperature fluctuates with the gas flow rate, and the difference is large. With automatic adjustment function. This traditional welding mode has the advantages of simple structure and low investment cost for heat exchangers with a large difference in melting point temperature between the pipe and the solder. [0003] However, for a heat exchanger with a small temperature difference between the melting point of the tube and the solder, such as the welding of an aluminum tube heat exchanger, the melting point difference between the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K3/08B23K101/14
Inventor 郭芳程程志明
Owner MIDEA GRP CO LTD
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