Whole process tracking automatic adjustment system and control method of steel pipe pre-welding machine

Abstract

The invention provides a whole-process tracing automatic adjusting system for a steel pipe pre-welding machine. By using the system combining a proportional overflow valve, a proportional electronic reversing valve, a pressure senor, electric control and welding, the initial pressure load of the dead zone pressure of the proportional overflow valve acting on a main oil cylinder can be lowered, the initial pressure of the main oil cylinder is insufficient to damage a steel plate and mechanical parts, the problem that the welding quality of ultra-thick, ultra-thin, ultra-small and ultra-large steel pipes cannot be guaranteed in the prior art is solved, the problems that the steel pipes are bent under pressure and have pressing marks, or welding cannot be performed due to the fact that misalignment of the steel pipes during welding moving exists are solved, cost and manpower resources are saved greatly, steel plate rejection rate is reduced, automation is achieved greatly, and production efficiency is increased.

Description

technical field [0001] The invention belongs to the technical field of control system of steel pipe pre-welding machine in the pipe industry, and specifically relates to steel pipes of various specifications that are tracked and adjusted during the whole process of automatic welding of steel pipes to eliminate welding defects during welding and steel pipes with wrong sides during welding The whole process tracking automatic adjustment system and its control method of the pre-welding machine. Background technique [0002] There was no pre-welding in the production of longitudinal submerged arc welded steel pipes in the early years. It was not until the second generation of UOE welded pipe units that pre-welders began to emerge, but at this time the pre-welds were intermittent welding with a spacing of about 300mm. In the third generation of development (1968-1979), pre-welding has been greatly emphasized and developed, and the discontinuous form has been changed into a contin...

AI Technical Summary

Problems solved by technology

Welding plays an important role in determining the quality and strength of the welded seam of the steel pipe in the welding process. According to different specifications of the pipe diameter, it can meet the relevant standards or use requirements. In the past, the steel pipe pre-welding machine welded manually during the welding process. Adjustment will not only delay the time but also consume materials and human resources during welding, and most of the welded products cannot meet the quality requirements of steel pipes in terms of welding quality.

There are two reasons for these formations: Article 1: Manual welding is performed during welding. During manual welding, a large number of welding bubbles and welding fog will also be generated, which will affect people's vision and labor intensity. During the welding process of time, human physical strength will also decrease, and the welding quality will also decrease. At the same time, the quality of the entire welding seam cannot be guaranteed due to the welding bubbles generated during the welding process.

Article 2: The electrical control and hydraulic systems are controlled by operating switches and electro-hydraulic directional valves. When pressing steel pipes, synchronization cannot be achieved or when pressure is checked, it can only be operated by artificially looking at pressure gauges and empirical values.

During the pressing process, problems such as surface damage, deformation, or unqualified welding of steel pipes of different specifications will seriously affect the quality, and the entire steel pipe will be scrapped.

In the pressure relief and return process of the system, the electro-hydraulic reversing valve cannot be adjusted during the pressure relief. When the pressure is released, the reversing valve changes direction instantaneously and produces an impact sound. At the moment of the discharge impact, it is returned to the oil circuit A large amount of oil film is also produced, which affects the stability of the entire machine tool, and also affects the welding quality and use of the entire machine tool during the welding process, and the requirements for the operator are also very high.

In the welding process, due to manual control and operation, the quality of welding cannot be guaranteed, and only inspection methods are used to control quality problems. Manual control and operation cannot guarantee that steel pipes have defects in welding and other problems.

Also because of limited inspection methods and a great waste of manpower and resources, production and processing costs are also greatly increased, and the production profits brought are also limited.

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