Control method and device for steel rail alternating current flash welding and welding equipment
A welding equipment and control method technology, applied in digital control, program control, electrical program control and other directions, can solve the problems of insufficient joint end face protection, high equipment requirements, small welding current, etc., to achieve accurate and rapid control signal response, system High flexibility and the effect of increasing welding efficiency
Pending Publication Date: 2021-06-25
成都西南交通大学产业(集团)有限公司 +1
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Problems solved by technology
The preheating flash welding commonly used in DC flash welding has high requirements on equipment and heavy load, which is not conducive to equipment life
AC flash welding adopts the control method of current feedback to adjust the feeding speed in real time, but its small welding current is small, generally lower than 100A, and in the pre-flash and high-voltage stages of welding, there is very little flash, and the protection of the end face of the joint is not good enough
[0003] Moreover, the existing AC flash welding control method has a large speed adjustment range, so the signal output to the electro-hydraulic servo valve changes greatly, the oil pressure changes greatly, and the load on the oil cylinder and oil pipeline is large, which is not conducive to the life of the equipment.
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[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
[0021] It should be noted that like numerals and let...
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The invention relates to the technical field of steel rail flash welding and particularly relates to a steel rail alternating current flash welding control method and device and welding equipment. A controller and an electro-hydraulic servo valve are used for achieving high-speed response of a movable clamp, and control signal response is accurate and rapid. The vibration period is controlled by adopting the fixed scanning period of the controller instead of a timer so that the influence of the error of the timer is eliminated. Vibration is superposed on the burning speed calculated in real time, so the movable clamp is fed in a pulsating manner, a minimum current value is increased, and welding efficiency is improved; and speed regulation control is achieved based on current feedback, and the system is high in flexibility and can be suitable for different types of flash welding machines.
Description
technical field [0001] The invention relates to the technical field of rail flash welding, in particular to a control method, device and welding equipment for rail flash welding. Background technique [0002] Existing rail flash welding is divided into AC flash welding and DC flash welding, each of which has its own characteristics. The preheating flash welding commonly used in DC flash welding has high requirements on equipment and a large load, which is not conducive to the life of equipment. AC flash welding adopts the control method of current feedback to adjust the feeding speed in real time, but its minimum welding current is small, generally lower than 100A, and in the pre-flash and high-voltage stages of welding, there is very little flash, and the protection of the joint end face is not good enough. [0003] And the existing AC flash welding control mode has a large speed adjustment range, so the signal output to the electro-hydraulic servo valve changes greatly, t...
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IPC IPC(8): G05B19/416
CPCG05B19/416G05B2219/34432
Inventor 吕其兵张扬谭洪涛曹晓冬
Owner 成都西南交通大学产业(集团)有限公司