PVDF-based water jet transient impact pressure testing method and device

Abstract

The present invention discloses a PVDF-based water jet transient impact pressure testing method and a device. The device comprises a water pump, a nozzle, a motor, a front stop plate, a rear stop plate, a target plate and a computer. The inlet of the water pump is connected with a water tank through a pipeline. The outlet of the water pump is connected with the nozzle through another pipeline. The motor, the rear stop plate and the target plate are arranged on a test bench. The output shaft of the motor is connected with the front stop plate. The target plate, the front stop plate and the rear stop plate are parallel to one another. Corresponding to the nozzle, the front stop plate is provided with a plurality of through holes. Corresponding to the nozzle, the rear stop plate is provided with a jet hole. Corresponding to the jet hole, the target plate is provided with a pressure sensor. The pressure sensor is connected with the computer. The device is simple in structure and convenient in operation. By adopting the stop plates, a continuous water jet is cut off. Therefore, the test on the transient impact effect of a water jet under a stable working pressure can be conducted.

Description

technical field [0001] The invention belongs to the technical field of water jet impact pressure testing, and in particular relates to a PVDF-based water jet transient impact pressure testing method and device. Background technique [0002] High-pressure water jet technology is a new type of technology that uses the pump body as the power source, high-speed water flow as the energy carrier, and finally acts on the target body for physical crushing. In view of the high-efficiency, dust-free, low-heat and low-vibration characteristics of high-pressure water jets for material crushing, this technology has been widely used in industrial cleaning, surface rust removal, rock cutting, mining and oil and gas drilling in recent decades. field. [0003] High-pressure water jet rock breaking is an important application branch of this technology, which can be used in underground coal mine hydraulic mining and oil and gas jet drilling. The impact fracture of rock by water jet can be di...

AI Technical Summary

Problems solved by technology

However, there are still two important defects in the test method proposed in this paper: (1) using a single cut-off disc to cut off the continuous water jet is likely to cause defects such as asymmetric structure and poor convergence of the cut-off water jet; (2) high-pressure water The jet directly impacts on the PVDF film, on the one hand, it is easy to damage the sensor structure, and on the other hand, it is easy to cause the loss of tiny charge signals on the PVDF film

In addition, the test system proposed in the paper "Research on Transient Dynamic Characteristics of Water Jet Impact and Rock Breaking Mechanism" still has problems such as difficult alignment between the jet center and the target body center, and difficulty in adjusting the distance between the nozzle and the target body.

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