SU987433A2

SU987433A2 - Brake device for impact testing stand

Info

Publication number: SU987433A2
Application number: SU813328456A
Authority: SU
Inventors: Владимир Александрович Воробьев
Original assignee: Vorobev Vladimir A
Priority date: 1981-08-12
Filing date: 1981-08-12
Publication date: 1983-01-07

Description

Изобретение относитс к испытательной технике, в частности к устройствам , служащим дл создани тормозного импульса в стендах дл ударных испытаний изделий.The invention relates to a testing technique, in particular, to devices for generating a braking impulse in test benches for impact testing.

По основному авт.св. 796691 известно тормозное устройство к стенду дл ударных испытаний, содержащее , захватываемую подвижной кареткой массу, распределенную по длине участка торможени , представл ющую собой гибкий длинномерный элемент с переменным по его длине сечением. Гибкий длинномерный элемент может быть выполнен в виде цепи со звень ми различной величины. Торможение каретки с закрепленным на ней испытуемым изделием осуществл етс за счет последовательного присоединени к каретке массы длинномерного элемента. При этом часть кинетической энергии каретки передаетс част м длинномер ного элемента, в результате чего скорость каретки уменьшаетс по закону , завис щему от закона изменени погонной массы по Длине длинномерного элемента 13Тормозное устройство позвол ет реализовать достаточно широкий класс тормозных импульсов. Однако при выполнении длинномерного элемента в виде цепи оказываетс затрудненной регулировка параметров тормозного импульса. Дл этого необходимо изме .н ть массу и пор док установки звеньев в цепи, а также увеличивать или уменьшать их чи.сло, что вл етс весьма трудоемким процессом.According to the main auth. 796691. A brake device to a shock test bench is known, which contains a mass gripped by a movable carriage distributed along the length of the braking section, which is a flexible, long element with a variable cross section along its length. The flexible long element can be made in the form of a chain with links of various sizes. The carriage with the test product fixed on it is braked by successively connecting a mass of a long element to the carriage. In this case, part of the kinetic energy of the carriage is transferred to parts of the long element, as a result of which the speed of the carriage decreases according to the law, depending on the law of variation of the linear mass along the length of the long element 13 The braking device allows for a fairly wide class of braking impulses. However, when executing a lengthy element in the form of a chain, it becomes difficult to adjust the parameters of the braking impulse. For this, it is necessary to change the mass and the order of installation of the links in the chain, as well as to increase or decrease their number, which is a very laborious process.

Кроме того, обычно стенд, вклю10 чающий такое тормозное устройство, содержит еще один гибкий длинномерный элемент т кабель, соедин ющий испытуемое изделие с измеритель ной аппаратурой. Наличие кабел , с од15 ной стороны, искажает, форму тормозного импульса, а с другой - приводит к снижению надежности работы стенда, поскольку кабель в процессе испыта- Ний претерпевает многократные H3rHj6H In addition, the stand, which includes such a braking device, usually contains another flexible long element and a cable connecting the test product with the measuring equipment. The presence of a cable, on the one hand, distorts the shape of the braking impulse, and on the other, leads to a decrease in the reliability of the stand, since the cable undergoes repeated tests during the tests. H3rHj6H

20 и может быть поврежден при образований на нем петли или при зацеплении за элементы стенда. ,20 and may be damaged when a loop is formed on it or when it is hooked onto the elements of the stand. ,

Целью изобретени вл етс упрощение регулировки параметров воспро-. The aim of the invention is to simplify the adjustment of repro parameters.

25 изводимого импульса, повышение надежности точности воспроизведени заданного импульса.25 emitted pulse, increasing the reliability of the accuracy of reproduction of a given pulse.

Поставленна цель достигаетс тем, что в тормозном устройстве к The goal is achieved by the fact that in the braking device to

Claims

30 shock test bench containing a mass, distributed over the length of the braking section, is a flexible long element with a variable cross section along its length; this flexible long element is designed as a cable for connecting the item under test with measuring equipment with installed on it with the possibility of adjusting movement - along it loads. In addition, each load can be made with a through-threaded hole for passing the cable and is provided with two threaded lugs screwed into the holes and a ring of elastic material enclosing the cable placed between the sleeves. In addition, metric markup can be applied to the cable. FIG. 1 depicts the braking force in FIG. 2 - one of the loads, cut. The device contains a flexible long element, made in the form of a cable 4, connecting test item 2 (sensors mounted on the product) with measuring equipment 5, s, connected to the movable carriage 1 of the stand with the product 2-, moving along the track 3. installed on it in accordance with the required law of braking loads 6. The load b is made in the form of a cylinder with a central thread Elm hole 7, inside which is placed a ring 8 of elastic material, such as rubber. Ring 8 may be formed at. the help of the threaded sleeves 9, screwed into the hole-. In the initial (undeformed) state, the inner diameter of the elastic rings 8 is slightly larger than the outer diameter of the cable 4. To eliminate the undue loads of the person tested from section 2, cable 4 is fixed on carriage 1 at point 10. In addition, cable 4 is attached to the base of the stand at 11 taking into account that the length of cable 4 is enough until the carriage 1 is completely stopped. To increase the work with the braking device, cable 4 is marked with a marking (not shown) indicating its length from the carriage 1 Marking (risks and figures) can be done with paint g avirovkoy or any other method. The presence of such a markup makes it easy to find places on the cable where it is necessary to install inertial masses. The device works as follows. Based on the specified braking law, the weights b are distributed along the length of cable 4 and fixed in these positions by compressing the cable with elastic rings 8 when screwing the threaded sleeves 9. When the carriage 1 is accelerated with a booster (not shown) to a given speed, the carriage 1 engages cable 4 in motion. In the deceleration section. The loads 6, fixed on the cable 4, are drawn into motion, which together with the cable 4 form the required law of braking. The measuring information from the test article 2 via cable 4 is fed to the measuring equipment 5 during the whole test. With such an embodiment of the flexible long element, it simultaneously performs the functions of a braking device and a cable for connecting the product with the measuring apparatus. In this case, the formation of loops on the cable and its hooks are excluded, since it is all the time under tension, forming a braking impulse. In addition, the accuracy of reproduction of a given braking law is improved due to the absence of an additional lengthy element and the setting, which ocyjuecT- by placing loads in the specified cable points, is significantly simplified, in accordance with the required braking law. The use of the invention allows to reduce the labor costs for testing and increase the reliability of their results. Claim 1. Braking device to the stand for impact tests according to auth.St. No. 796691, so that, in order to simplify the adjustment of the parameters of the reproduced pulse, increase the reliability and accuracy of reproduction of a given pulse, the flexible long-length element is designed as a cable for connecting the tested product with the measuring apparatus mounted on it with the possibility of adjusting the movement along it loads.

2. The device according to claim 1, characterized in that each load is made with a through-threaded hole for passing the cable and is provided with two threaded bushings screwed into the hole and a ring of elastic material placed between the sleeves, covering the cable.

3 .. The device in PP. 1-2, characterized in that the cable has metric markings. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 796691, cl. G, 01 M 7/00, 1979 (prototype).

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