A hydraulic control system and hydraulic test steel pipe machine oil-water balance system

A technology of hydraulic control system and water pressure test, which is applied to fluid pressure actuating system components, using stable tension/pressure to test the strength of materials, mechanical equipment, etc. Problems such as certainty and easy damage to the end face sealing ring, to achieve the effect of stable and reliable pressure following, suitable for popularization and use, and reliable and stable control

CN103062143BActive Publication Date: 2015-12-23TAIYUAN HEAVY IND +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-12-23

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Abstract

The invention discloses a hydraulic control system and a hydrostatic testing steel pipe machine oil-water balance system with the hydraulic control system. The hydraulic control system comprises multiple master cylinders, a constant pressure variable pump, a proportional pressure reducing valve, a proportional overflow valve, an electromagnetic overflow valve, a prefilled valve and a top petrol tank. The multiple master cylinders are connected in parallel. The constant pressure variable pump is driven by an electrical machine. The inlet of the constant pressure variable pump communicates with the top petrol tank. The outlet of the constant pressure variable pump communicates with the master cylinders. Each of the electromagnetic overflow valve and the proportional overflow valve is arranged between the constant pressure variable pump and the top petrol tank in a communicated mode. The proportional pressure reducing valve is arranged in series between the constant pressure variable pump and the master cylinder. The prefilled valve is arranged between the top petrol tank and the master cylinder in a communicated mode. Pre-sealing compress water filling is carried out towards the testing steel pipe by the proportional pressure reducing valve. The pressure of pre-sealing is stable and the controlled pressure is small. Pressure maintaining is carried out towards the master cylinder by the proportional overflow valve so that the pressure following is stable and reliable and the responsive time is short.
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Description

technical field

[0001] The invention relates to an oil-water balance system of a steel pipe engine for a hydraulic test, in particular to a hydraulic control system for the oil-water balance system of a steel pipe engine for a hydraulic test. Background technique

[0002] The hydrostatic test steel pipe machine is used to carry out hydrostatic pressure test on large-diameter longitudinal submerged arc welded pipes, check whether there are leakage defects in the steel pipes within the specified pressure holding time, assess the overall pressure bearing capacity of the steel pipes, and eliminate part of the residual stress of the pipe body to Guarantee the performance of the steel pipe. Among them, the oil-water balance system is the core control system of the hydraulic testing machine. When the high-pressure water test is performed on the steel pipe, the system can make the oil pressure stable, timely and accurately track the water pressure value in the test steel pipe, so as...

Examples

Embodiment Construction

[0026]Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention is capable of various changes in different embodiments without departing from the scope of the present invention, and that the description and drawings therein are illustrative in nature and not limiting. this invention.

[0027] The principle of the hydraulic control system 4 for hydraulic test steel pipe machine oil-water balance of the present invention is as follows Figure 4 As shown, it includes 4 parallel main hydraulic cylinders 20, a high oil tank 40, a constant pressure variable pump 41, a motor 42, an electromagnetic overflow valve 43, a proportional overflow valve 44, a proportional pressure reducing valve 45, A filling valve 46 , a pressure gauge 47 and a pressure sensor 48 . The constant pressure variable pump 41 is driven by a motor 42 , the inlet of the constant pr...