SU979950A1

SU979950A1 - Press bedplate

Info

Publication number: SU979950A1
Application number: SU813279652A
Authority: SU
Inventors: Юрий Александрович Колпаков; Алексей Николаевич Чернов; Станислав Викторович Хмелев; Татьяна Анатольевна Болдырева
Original assignee: Уральский научно-исследовательский и проектный институт строительных материалов
Priority date: 1981-02-26
Filing date: 1981-02-26
Publication date: 1982-12-07

Description

(54) ОПОРНАЯ ПЛИТА К ПРЕССУ(54) SUPPORT PLATE TO THE PRESS

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Изобретение относитс к испытательной технике и может быть использовано при испытании на сжатие, преимущественно, строительных материалов переменной плотности.The invention relates to a testing technique and can be used in a compression test, preferably of varying density building materials.

Известна опорна плита к прессу дл испьпани на сжатие, содержаща шаровой щарнир дл соединени ее с прессом 1 .A known support plate for a compression press containing a ball joint for connecting it to the press 1.

Недостатком известной плиты вл етс низка точность испытани образцов переменной плотности, например бетонных, поскольку в процессе. нагружени плита поворачиваетс , образу перекос, что приводит к эксцентриситету действующей на образец силы.A disadvantage of the known plate is the low accuracy of testing samples of variable density, such as concrete, because of the process. loading the plate is rotated to form a skew, which leads to an eccentricity of the force acting on the sample.

Цель изобретени - повышение точности испытани образцов, переменной плотности путем обеспечени заклинивани плиты.The purpose of the invention is to improve the accuracy of testing samples of varying density by ensuring that the plate is seized.

Указанна цель достигаетс тем, что в опорной плите к прессу дл испытани на сжатие, содержащей шаровой щарнир дл соеданени ее с прессом, в щаровой части шарнира выполнена сферическа полость с каналом дл подачи жидкой среда.1 под давлением в полость.This goal is achieved by the fact that a spherical cavity with a channel for supplying a liquid medium 1 under pressure to the cavity is made in the compression test press containing the ball joint to connect it to the press in the base plate.

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При зтом полость расположена эксцентрично поверхности щаровой части щарнйра, а отношение минимальной толщины стенки полости к внепшему диаметру шаровой части составл ет 0,05-0,15.With this, the cavity is located eccentric to the surface of the ball part of the ball, and the ratio of the minimum wall thickness of the cavity to the outside diameter of the ball part is 0.05-0.15.

На чертеже изображена предлагаема опорна плита.The drawing shows the proposed support plate.

Опорна плита 1 содержит шаровой шарнир дл соединени ее с верхней плитой 2 прес10 са, в щаровой части 3 которого выполнена сферическа полость 4, расположенна зксцентрично внепшей поверхности шаровой части 3. Дл подачи жидкой среды, преимущественно , масла в полость 4 имеетс канал 5.The support plate 1 contains a ball joint for connecting it with the upper plate 2 of the press 10, in the bowl part 3 of which a spherical cavity 4 is formed, located eccentric with the surface of the ball part 3. Channel 5 is provided for supplying a liquid medium, preferably oil, to the cavity 4.

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Толщина стенки полости 4 минимальна в нижней ее части, при зтом отнощение толщины стенки в этом, месте к внешнему диаметру щаровой части 3 должно находитьс в пределах 0,05-0,15.The wall thickness of cavity 4 is minimal in its lower part, however, the ratio of wall thickness in this place to the external diameter of the ball part 3 should be in the range of 0.05-0.15.

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Опорна шшта работает следующим образомThe support rod works as follows

Claims

Sample 6 is mounted on the lower plate 7 of the press and brought into contact with the upper plate 2 of the press. If the edges of sample 6 are not parallel, the base plate 1, turning around the plate, is evenly attached to the sample. Using a press force mechanism, a sample is applied with a compressive load of 5-10% of the expected breaking load. After that, through the channel 5 into the cavity 4, the oil is supplied under pressure, as a result of which the spherical part 3 of the hinge expands and wedges the plate 1 from the turn, making it non-hinged. In such a case, the load is adjusted to the breaking point and the strength of the sample is determined. The plate work requires that the oil pressure in cavity 4 is not less than the oil pressure in the hydraulic cylinder (not shown) of the press, on the piston of which the lower plate 7 of the press rests. In this case, with a sufficiently narrow gap between the outer surface of the ball part 3 of the hinge and the upper plate 2 of the press, it is possible to test even if there is a hole in the lower most thin spot of the ball part 3 of the hinge, i.e. the strength of the thinnest part of the wall in the local zone will be zero. This is possible due to the incompressibility of the fluid. In this case, the ball joint works like a normal piston, transferring pressure to the plate through the oil. To do this, it is only necessary that the gap between the ball joint and the plate be no larger than the gap between the piston and the cylinder of the press. In order to jam the plate on the ball joint, the oil pressure in cavity 4 must be increased so that the walls of the hinge start to work for stretching and press tightly to the ball notch in plate 1. The required excess pressure of oil compared to its pressure in press cylinder, is about 10-20%. The invention allows the plate to wedge during loading and at the same time fit it tightly to the specimen, which improves the accuracy of the test. Claim 1. Support plate for compression test press containing a ball joint for connecting it to a press, characterized in that, in order to improve the accuracy of testing variable density samples by ensuring the plate is jammed, a spherical cavity with a channel is made in the ball joint part for feeding a liquid medium under pressure into the cavity.

2. The plate of claim 1, that is, that the cavity is located eccentric to the outer surface of the ball of the hinge, and the ratio of the minimum wall thickness of the cavity to the outer diameter of the ball is 0.05-0.15 . Sources of information taken into account during the examination 1. GOST 8905-73 (prototype).

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