Test method and device thereof for reciprocating tensile fatigue testing of safety break-away valves for oiling machines

Abstract

The invention provides a test method for reciprocating tensile fatigue testing of safety break-away valves for oiling machines, which belongs to the technical field of assembly and testing of the safety break-away valves for the oiling machines. A two-way time relay is used for controlling the reciprocating motion of a piston rod of a cylinder with a valve, tensile force F born on the tested safety break-away valve can be gradually increased from 0N to the gravity of a heavy hammer via 3S-5S by utilizing the cushioning action of a spring, time is delayed for 3S-5S, and the tensile force F born on the tested safety break-away valve is gradually reduced from the gravity of the heavy hammer to 0N via 3S-5S, thereby constituting a reciprocating tensile fatigue test cycle, displaying 1 on a counter, and testing in such as way; when the repeated cycles reach 10000 and the tested safety break-away valves are not broken away, the batch of the safety break-away valves can be judged to be qualified; when the cycles are less than 10000 and any one of the tested safety break-away valves is broken away, the batch of the safety break-away valves can be judged to be unqualified. The test method has novel design and high working efficiency, and can find the quality hidden troubles of products in time and avoid the economic loss and the safety accidents.

Description

technical field [0001] The invention relates to a test method and a device for a reciprocating tensile fatigue test of a safety break valve for a fuel dispenser, and belongs to the technical field of assembly testing of a safety break valve for a fuel dispenser. Background technique [0002] The safety pull-off valve for the fuel dispenser is installed on the fuel delivery pipe of the fuel dispenser. It is a safety connection device between the fuel gun and the fuel dispenser. It has a built-in check valve. Once the fuel gun is pulled by a certain external force, the safety pull-off valve will It will break automatically, and at the same time automatically close and cut off the oil flow, so as to avoid the breakage of the fuel pipe of the fuel dispenser or the fuel dispenser being pulled down, so as to avoid dangerous accidents; at present, the fatigue test of the safety pull-off valve is generally installed directly on the fuel pipe of the fuel dispenser. In this way, not o...

AI Technical Summary

Problems solved by technology

[0002] The safety pull-off valve for the fuel dispenser is installed on the fuel delivery pipe of the fuel dispenser. It is a safety connection device between the fuel gun and the fuel dispenser. It has a built-in check valve. Once the fuel gun is pulled by a certain external force, the safety pull-off valve will It will break automatically, and at the same time, it will automatically close and cut off the oil flow, so as to avoid the breakage of the fuel pipe of the fuel dispenser or the fuel dispenser being pulled down, so as to avoid dangerous accidents; at present, the fatigue test of the safety pull-off valve is generally installed directly on the fuel pipe of the fuel dispenser. The length of the safety breakaway valve is judged whether the batch is qualified. In this way, not only the work efficiency is low, but also there are likely to be hidden dangers in quality, resulting in economic losses and safety accidents.

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