Device for measuring double maximum static load permanent deformation quantity of mine plugs by grating ruler

Abstract

The invention relates to a device for measuring the double maximum static load permanent deformation quantity of mine plugs by a grating ruler in the technical field of coal mine safety. The device comprises a machine frame, wherein the machine frame comprises two longitudinal beams and cross beams positioned between the two longitudinal beams; the cross beams comprise an upper cross beam and a lower cross beam; the lower cross beam is driven by external force to slide in a slideway arranged at the inner side of the two longitudinal beams; a base is arranged under the machine frame; the lowerside of the lower cross beam and the upper side of the base are respectively provided with an upper pull head and a lower pull head; the lower pull head is a fixed pull head; the upper pull head is amovable pull head; upper and lower plugs penetrating through the two opposite side walls are respectively arranged on the upper pull head and the lower pull head; the two ends of a connecting elementto be tested are respectively connected with the upper pull head and the lower pull head through the upper plug and the lower plug, and are used for loading; the grating ruler for measuring displacement is installed. The whole test device is controlled through an automatic system; the measurement data is directly read by a system; the measurement result and data precision is greatly improved.

Description

technical field [0001] The invention relates to the technical field of coal mine safety, in particular to a device for measuring the permanent deformation of a bolt used in mines with a grating ruler twice the maximum static load. Background technique [0002] The National Coal Mine Safety Equipment Testing and Inspection Catalog (the first batch) requires the connecting pins of narrow-gauge vehicles in use in coal mines. According to the "Inspection Specifications for the Connecting Pins of Narrow-gauge Vehicles in Coal Mine", the amount of permanent bending deformation when the double maximum static load test is carried out The inspection shall be conducted every six months according to Article 414 of the "Coal Mine Safety Regulations" (2011) to ensure safe production in the coal mine. Different from the previous standard based on MT-244.2-2005 "Narrow Gauge Vehicle Connector Connecting Pins in Use in Coal Mine", the new standard (People's Republic of China Safety Producti...

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Problems solved by technology

[0004] Under the new standard, the old standard measuring equipment cannot adapt to:

[0005] (1) The range of force exerted by the universal hydraulic testing machine is too large: calculated according to the weight, slope, conveying capacity, quantity, friction, etc. of narrow gauge vehicles in coal mines, the maximum load range: 10 ~ 50Kn, 1000kN tension can meet the requirements, the range is too large greatly increased the measurement error;

[0006] (2) The measurement accuracy cannot meet the measurement requirements: there are three specifications for the diameter of the bolt used in coal mines: 38mm, 40mm, 41-50mm, the most commonly used 40mm, the qualified requirement is not more than 0.072mm, 0.08mm, 0.082-0.1mm, the most commonly used is 40mm, Therefore, under the premise that the measurement accuracy of the new standard is required to reach 1um, mechanical measuring instruments cannot meet this requirement;

[0007] (3) The new standard test process is completed in three stages, and the loading speed of each stage is different. It is impossible to manually control the oil volume of the universal hydraulic test machine, and it will cause waste of load, and the test requirements for permanent deformation of double static load cannot be achieved.

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