Automatic impact-resistant experiment instrument for concrete and mortar

Abstract

The invention provides an automatic impact-resistant experiment instrument for concrete and mortar. The automatic impact-resistant experiment instrument at least comprises a base and a bracket, wherein an upwards convex positioning plate is arranged on the base; a sample seat fixed between the positioning plates is arranged on the base; a hollow cavity of which the opening is upward is formed inside the sample seat; a concrete and mortar sample is contained in the cavity; a counter weight lifting device and a control system are arranged on the bracket; the control system comprises a programmable logic controller (PLC), a solenoid valve and an air reversing valve; the air reversing valve is connected with an air tube of a cylinder and is used for adjusting the movement direction of a piston rod on the cylinder; and both the PLC and the solenoid valve are connected with the cylinder and are used for controlling the travel of the piston rod on the cylinder. The automatic impact-resistant experiment instrument is simple in structure, convenient to use and accurate in height positioning, the rise and fall of the counter weight can be automatically controlled, the manual labor is greatly saved, and the efficiency is improved.

Description

technical field [0001] The invention relates to a testing instrument in the construction industry, in particular to an automatic concrete or mortar impact resistance tester, which belongs to the field of mechanical devices. Background technique [0002] The impact resistance of concrete or mortar refers to the ability of concrete or mortar to absorb kinetic energy under repeated impact loads. It is one of the important indicators to measure the mechanical properties of concrete or mortar, and it is also an important reference for concrete engineering design and construction. . At present, the commonly used impact resistance test methods in the world mainly include explosion test, projectile test, Charpy pendulum impact test and drop weight impact test. The domestic basis is mainly based on the "CECS13-2009 fiber reinforced concrete" recommended by the China Engineering Construction Association standard. "Test method" for testing. The test method adopts the drop hammer impa...

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Problems solved by technology

The defects of the above scheme are mainly manifested in: firstly, the height of each falling hammer cannot be guaranteed to fully meet the height value required in the "CECS13-2009 Fiber Concrete Test Method" by the method of hand-dropping the hammer; secondly, the resistance of general concrete or mortar The number of impacts is more than 200 times, and the number of impact resistance for high-strength concrete or mortar test blocks is even more than 1000 times, and the standard points out that the discrete type of the test is very large, and the number of test pieces in a group of tests is 6, so , it is extremely time-consuming and labor-intensive to operate by manually lifting the drop hammer or manual control

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