Shearing clutch type hammering Brinell hardness tester for applying test force through impact hammer

Abstract

The invention discloses a shearing clutch type hammering Brinell hardness tester for applying test force through an impact hammer. The problems that each operation impact force is inconsistent, the measurement result is large in error and the applicable range is narrow since the impact force on a spherical pressure head is produced by the knocking of a hammer or the knocking of the knocking part;the hardness tester is characterized in that a trigger cylinder and a telescopic cylinder are arranged in an outer cylinder, an impact hammer is arranged in the telescopic cylinder; after a circular conical surface at a lower end of the trigger cylinder contacts an arc bevel of a trigger, the trigger rotates around a trigger shaft, a trigger hook head of the trigger breaks away from a low boss ofa trigger pothook, the impact hammer downwardly popups under the expansion force effect of a main spring to strike a spherical head of a pressure head seat; the pressure head produces a counter-actingforce for the impact force produced by the impact hammer to break the shearing clutch into three sections. The hardness tester disclosed by the invention reduces the labor intensity and the operationdifficulty, so that the operation is easier and safer, the impact force is consistent, the measurement precision is high, the measurement is more stable, and the applicable range is wide.

Description

technical field [0001] The invention belongs to the technical field of hardness testers, in particular to a shear pin type hammer Brinell hardness tester which applies a test force through an impact hammer. Background technique [0002] Hammer Brinell Hardness Tester is mainly used to test various large, assembled, uncut or inconvenient to move workpieces. It is generally used to test large and medium-sized castings, forgings, steel, non-ferrous metals and semi-finished workpieces that have been quenched and tempered. Typical The products include ordinary hammer Brinell hardness tester and shear pin type hammer Brinell hardness tester. Among them, the hardness testing principle of the shear pin hammer Brinell hardness tester is to use a hardened steel spherical indenter or a hard alloy spherical indenter to press into the surface of the sample with the corresponding test force. The impact force exerted by the head cuts off a specific diameter and vertical shear pin to achie...

AI Technical Summary

Problems solved by technology

That is to say, in the prior art, the impact force applied to the spherical indenter is generated by the impact of a dynamic force applying device formed by a hammer or a knocker, or by a C-shaped frame with a screw rod and a wrench. The impact force of the hammer should be greater than the required test force, which requires the operator to hit the hammer with enough weight to the pressure of the spherical indenter at a fast enough speed and accurately. On the head bracket, there are problems. First, the operator is required to have enough strength to achieve a fast enough speed of the hammer. Second, the operator is required to accurately hit the hammer on the head bracket. Third, if the operator cannot If one strike breaks the shear pin, then the measurement will be terminated and invalid, and the measurement point must be replaced to continue the measurement, which will cause a loss in cost. Fourth, the impact energy of each strike is different , will affect the realization of the impact force, so that the error of the measurement result will become larger; while the impact of the static force adding device composed of a C-shaped frame with a screw and a wrench will generate impact force, which will affect the thickness of the workpiece and the measured value. There are strict requirements on the location, narrow scope of application, and complex structure

However, the Brinell hardness test method adopted in this utility model is not suitable for the shear pin Brinell hardness test method, and the utility model has strict requirements on the test force of the main loading spring, and the structure is complicated and the cost is high

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