A hydraulic tool for internal and external pressure balance and its application method

Abstract

The present invention aims at the problems in the prior art that the sealing ring on the hydraulic tooling is damaged due to stress concentration, the rigid contact between the top support and the main body tooling is easily damaged, and water seepage, and provides a hydraulic tooling with internal and external pressure balance and its use method. It belongs to the technical field of hydrostatic testing and includes a connecting rod. One end of the connecting rod is provided with a screw thread, and the other end is fixedly provided with a rod cap to prevent the workpiece from falling out of the connecting rod. Support, tooling main body, stainless steel ring and nut, the limit ring and the top support are connected through a wedge-shaped connection structure, and one end of the limit ring is against the rod cap. The advantage of a hydraulic tooling with internal and external pressure balance is that by setting two installation grooves on both sides of the main tooling, the displacement compensation of the top support is realized and the flexible buffer connection between the nut and the main tooling makes the hydraulic tooling achieve internal and external pressure balance. Avoid damage to tooling due to excessive external pressure.

Description

technical field [0001] The invention belongs to the technical field of hydraulic test, and in particular relates to a hydraulic tool for internal and external pressure balance and a use method thereof. Background technique [0002] The hydrostatic test is an important measure to ensure the safety of the piping system. For example, for pressure vessels such as industrial boilers and Dewar bottles, the hydrostatic test is the most important inspection process in the entire product production process. Therefore, the hydrostatic test The quality of the product is directly related to whether the quality of the product is qualified, whether it can minimize quality accidents after installation, and ultimately reduce costs for customers. [0003] Whether the pressure test tooling of the hydrostatic test is simple and effective is the key to the success of the hydrostatic test. In the prior art, the requirements of the hydrostatic test are generally considered at the beginning, and p...

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Problems solved by technology

[0003] Whether the pressure test tooling of the hydrostatic test is simple and effective is the key to the success of the hydrostatic test. In the prior art, the requirements of the hydrostatic test are generally considered at the beginning, and part of the machining allowance is reserved. During the hydrostatic test, the After the steel plate is welded and sealed or the fixing hole is drilled outside, the hydraulic test is carried out by means of an external ferrule, but there are problems with the cutting allowance and groove processing after hydraulic pressure, which increases the production process and time, and the hydraulic tooling is also relatively cumbersome. The internal expansion hydraulic tooling that uses screw tension to drive tiles to generate positive pressure, but this tool is not easy to take out from the pipeline. Another example is an internal expansion hydraulic test tooling with the Chinese patent announcement number CN203772494U. This patent has passed Steps are set on the pre-tightening force rod and the taper sleeve, which can easily release the self-locking state of the hydraulic tooling, and can easily remove the expansion sleeve from the water pipe. During the pressure test, give the expansion sleeve a greater positive pressure to improve the self-locking performance of the hydraulic tooling. By setting the boss on the expansion sleeve, it can prevent the expansion sleeve from falling into the water pipe when the tooling is pre-tightened. This kind of hydraulic tool has the following problems: 1. When the water pressure of the test is high, it is easy to cause the stress concentration of the sealing ring in contact with the equipment being tested, thereby irreversibly destroying the sealing ring, and then making the sealing performance of the hydraulic tool worse ;2. Since the nut is in direct contact with the main body of the tooling, a gap between the two metal parts is likely to cause water leakage; 3. The contact between the taper sleeve and the rod body is a rigid contact. When the friction between the two is not enough to resist the water pressure At this time, the hydraulic tooling will burst out due to the axial outward thrust, thus posing a safety hazard

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