Method and device for taking broken threaded head in coupling
A technology of thread head and acid solution, applied in hand-held tools, manufacturing tools, etc., can solve the problems of angle valve thread breakage, thread head failure, time-consuming and labor-intensive, etc., and achieve easy installation, time-saving, labor-saving and low-cost. Effect
Inactive Publication Date: 2018-08-24
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology
[0002] When replacing the angle valve of a leaking water heater, due to the long-term high-temperature corrosion of the angle valve, the thread of the angle valve often breaks in the coupling. There are generally two ways to solve this accident: one is to use a hacksaw blade to The thread head remaining in the coupling is axially sawed into several small pieces and taken out. This method is not only time-consuming and laborious, but also completely invalid for the broken thread head of the severely corroded angle valve.
The second is to replace the water pipelines and couplings embedded in the wall as a whole by smashing the wall. This method is not only time-consuming and laborious, but also brings a lot of additional workload, resulting in a great increase in cost
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[0011] The present invention will be further explained below in conjunction with the drawings:
[0012] The purpose of the present invention is to make up for the deficiencies of the prior art and provide a method and device for dissolving broken threads in a coupling based on electrochemical principles. The electrochemical principle applied in the present invention: different metals in the same corrosive medium, which metal corrodes and which metal is free from corrosion, should be based on their equilibrium potential as a criterion. Broken threaded heads are generally made of carbon steel, and couplings are mostly made of copper alloy. Looking up the table, we can see that the equilibrium potential of iron is -0.44V, and the equilibrium potential of copper is +0.337V. It can be seen that in the acid solution, iron is corroded to the anode of the galvanic cell and dissolves, and copper is corroded to the cathode of the galvanic cell and will not corrode. The reaction equation i...
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The invention discloses a method and device for taking a broken threaded head in a coupling, and mainly aims at providing a method and device for taking out a residual threaded head, broken and left in a nut, from a bolt. The method and device are characterized in that on the basis of the electrochemistry principle, the redox reaction is utilized, acid liquid is injected into the coupling in whichthe broken threaded head is left, and the acid liquid is used for cyclic injection; before cyclic injection of acid liquid every time, gas generated after the acid liquid and coupling reaction needsto be eliminated, and residual threaded head cleaning is conducted on the inner wall of the coupling in which the broken head is left; and the acid liquid can be hydrochloric acid or sulfuric acid.
Description
Technical field [0001] The invention relates to a method and a device used in production and life to take a broken thread head in a coupling by using a chemical method. Background technique [0002] When replacing a leaking water heater angle valve, due to long-term high temperature corrosion of the angle valve, the angle valve thread often breaks in the coupling. There are generally two ways to solve this accident: one is to use a steel saw blade. The thread head remaining in the coupling is axially sawn into several small pieces and taken out. This method is not only time-consuming and laborious, but also the broken thread head of the severely corroded angle valve will completely fail. The second is to replace the water pipelines and couplings embedded in the wall as a whole by smashing the wall. This method is not only time-consuming and labor-intensive, but also brings a lot of additional workload, resulting in a great increase in cost. Summary of the invention [0003] In or...
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IPC IPC(8): B25B27/18
CPCB25B27/18
Inventor 方华刘占祥谢金书
Owner NORTHEAST GASOLINEEUM UNIV