Drop hammer type shock test bench controlled by magnetic switch

Abstract

The invention provides a drop hammer type shock test bench controlled by a magnetic switch, belongs to the technical field of civil engineering, and relates to a fiber concrete shock-resistance property test device. The device is characterized in that a shock rack is vertically welded to a bottom plate; a positioning cantilever is connected with the shock rack through a movable bolt, and the height is freely adjusted; the magnetic switch is connected with the positioning cantilever through a movable bolt, and the position is accurately adjusted. The free falling of the shock hammer is ensured, and the protecting device is clamped around four iron baffle plates on the bottom plate through square sleeves, thus the edge conditions of a test piece during shocking are same, and simultaneously the safety of the operators is ensured. The invention has the advantages of obvious enhancement of shock test accuracy, wide application, simple structure, easy operation, convenient carrying and enhancement of test safety.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and relates to a fiber concrete impact resistance test device, in particular to a drop hammer type impact test bench controlled by a magnetic switch. Background technique [0002] Fiber-reinforced concrete can improve the mechanical properties and durability of concrete, and is widely used in building structures and tunnel engineering, and its development prospects are very promising. At present, the known test devices for the impact resistance of fiber concrete include the drop weight test device recommended by the ACI544 committee, and the drop weight test device in my country is similar to the one recommended by the ACI544 committee. When using this device for testing, it is necessary to manually lift the steel impact hammer to a specified height and align it with the specimen, and then relax the hands so that the impact hammer falls to impact the concrete specimen. Due to the manua...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an impact test device that makes the impact test more accurate, has a wider application range, is light in weight, is easy to carry, can protect the safety of operators, and is easy to operate, and is especially suitable for different domestic construction sites. It not only solves the problem of inconsistent initial drop height, initial velocity, initial acceleration change and boundary conditions in each impact test caused by manual operation, but also solves the problem that the center of gravity trace of the impact hammer cannot pass through the center of gravity of the impact ball each time it falls , and solve the problem of the safety of test personnel and the "side wall effect" of long fibers in concrete test molds

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