SU849053A1

SU849053A1 - Matrix of device for loose material friction invstigation

Info

Publication number: SU849053A1
Application number: SU792796788A
Authority: SU
Inventors: Юрий Николаевич Логинов; Станислав Иванович Паршаков; Александр Георгиевич Залазинский; Сергей Вадимович Шилов
Original assignee: Уральский Ордена Трудового Красно-Го Знамени Политехнический Институтим.C.M.Кирова
Priority date: 1979-07-16
Filing date: 1979-07-16
Publication date: 1981-07-23

Description

Изобретение относится к испытательной технике, в частности, устройствам для исследования трения сыпучих материалов с матрицами, предназначенными для прессования в них сыпучих материалов $ с целью исследования их трения при высоких удельных давлениях.The invention relates to testing equipment, in particular, devices for studying the friction of bulk materials with matrices intended for pressing bulk materials $ into them to study their friction at high specific pressures.

Известна матрица, выполненная в виде, полого цилиндра, которая не позволяет ,θ измерять давление сыпучего материал^ на ее стенки, что приводит к погрешности при определении коэффициента трения сыпучего материала И Наиболее близким к изобретению яв- ¹⁵ляется матрица устройств для исследования трения сыпучих материалов, выполненная , в виде полого цилиндра и силоизмерительгных датчиков, установленных на ее наружной боковой поверхности,_ъТакая конструкция матрицы позволяет изменить давление сыпучего материала на ее стенки при прессовании [2].Known matrix, made in the form of a hollow cylinder, which prevents, θ measure the pressure of the bulk material ^ at its wall that leads to an error in determining the coefficient of friction of the bulk material and closest to the invention yav- ¹⁵ matrix devices wish to set up for the study of friction of bulk materials , made in the form of a hollow cylinder and siloizmeritelgnyh sensors installed on an outer side surface, _b matrix Such construction allows to change the pressure of the bulk material in its wall during compression [2].

Однако диапазон удельных давлений прессования сыпучего материала в этой матрице, при котором она сохраняет свою работоспособность ограничен деформация—, ми растяжения силоизмерительных датчиков, которые не должны превышать предела пропорциональности.However, the range of specific pressures for pressing bulk material in this matrix, at which it maintains its operability, is limited by deformation — tensile stress measuring sensors, which should not exceed the limit of proportionality.

Цель изобретения - расширение диапазона условий проведения испытаний.The purpose of the invention is the expansion of the range of test conditions.

Эта цель достигается тем, что матрица снабжена гибкой упругой лентой, охватывающей боковую поверхность полого цилиндра, а силоизмерительные датчики установлены на гибкой ленте.This goal is achieved by the fact that the matrix is equipped with a flexible elastic tape covering the lateral surface of the hollow cylinder, and load cells are mounted on a flexible tape.

На чертеже представлена матрица устройств для исследования трения сыпучих материалов.The drawing shows a matrix of devices for studying the friction of bulk materials.

Матрица состоит из полого цилиндра 1, гибкой упругой ленты 2, охватывающей боковую поверхность полого цилиндра 1, и силоизмерительных датчиков 3, установленных на гибкой упругой ленте 2. Гибкая упругая лента 2 мажет представлять собой либо кольцо, либо участок спирали, концы которой закреплены на боковой поверхности полого цилиндра 1,. В матрице размещены верхний 4 и нижний 5 полые пуансоны. Через отверстия пуансонов 4 и 5 проходит калиброванный стержень 6. Пуансоны 4 и 5 взаимодействуют с верхней 7 и нижней 8 плитой пресса, а калиброванный стержень 6 связан с силовозбудителем, оснащенным снлоизмерителем (на чертеже не показан).The matrix consists of a hollow cylinder 1, a flexible elastic tape 2, covering the lateral surface of the hollow cylinder 1, and load cells 3 mounted on a flexible elastic tape 2. Flexible elastic tape 2 can be either a ring or a portion of a spiral whose ends are fixed to the side the surface of the hollow cylinder 1 ,. The upper 4 and lower 5 hollow punches are placed in the matrix. A calibrated rod 6 passes through the openings of the punches 4 and 5. The punches 4 and 5 interact with the upper 7 and lower 8 press plates, and the calibrated rod 6 is connected to a power exciter equipped with a diode meter (not shown in the drawing).

Матрица работает следующим образом.The matrix works as follows.

Сыпучий материал 9 загружается внутрь полого цилиндра 1, включается пресс и сыпучий материал 9 спрессовывается пуансонами 4 и 5, которые приводятся в движение от плит 7 и 8 пресса, со-? ответственно. При достижении заданного усилия прессования пресс отключается, а калиброванный стержень 6 выталкивается посредством силовозбудителя из спрессованного сыпучего материала 9. При этом измеряется осевое усилие, приложенное к калиброванному стержню 6, а с помощью силоизмерительных датчиков 3 давление сыпучего материала на внут реннюю поверхность полого цилиндра 1. На основе этих данных в дальнейшем раочитывают коэффициент трения.Bulk material 9 is loaded into the hollow cylinder 1, the press is turned on, and the bulk material 9 is compressed by punches 4 and 5, which are driven from the plates 7 and 8 of the press, co? responsibly. When the specified pressing force is reached, the press is turned off, and the calibrated rod 6 is pushed out by means of a force exciter from the compressed bulk material 9. In this case, the axial force applied to the calibrated rod 6 is measured, and with the help of load sensors 3, the pressure of the bulk material on the inner surface of the hollow cylinder 1. Based on these data, the friction coefficient is further calculated.

Claims

(54) MATRIX OF DEVICES FOR THE RESEARCH OF FRICTION OF BULK MATERIALS The invention relates to testing techniques, in particular, devices for studying friction of bulk materials with dies designed to compress friable materials in them to study their friction at high specific pressures. A known matrix made in the form of a hollow cylinder, which does not allow measuring the pressure of the bulk material on its walls, which leads to an error in determining the coefficient of friction of the bulk material. The matrix for devices for studying friction materials made in In the form of a hollow cylinder and force-measuring sensors mounted on its lateral surface, the matrix design allows the pressure of the bulk material to change on its wall 1 pressing 2. However The range of specific pressures, pressing of the bulk material in this matrix, at which it retains its performance is limited by the deformation of the load cell, which should not exceed the proportionality limit. The purpose of the invention is to expand the range: the area of the test conditions. This goal is achieved by the fact that the matrix is provided with a flexible elastic band covering the lateral surface of the hollow cylinder, and the load sensors are mounted on a flexible belt. The drawing shows a matrix of devices for investigating the friction of bulk materials. The matrix consists of a hollow cylinders 1, a flexible elastic band 2 covering the lateral surface of the hollow cylinder 1, and load sensors 3 mounted on a flexible elastic band 2. The flexible elastic band 2 can be either KOLYO or a section of splint, the ends of which are aajKpeimeJibi on the lateral surface of the hollow cylinder 1 ,. The upper 4 and lower 5 hollow punches are placed in the matrix. A gauge rod passes through the holes in Ouavsov 4 and 5. Punches 4 and 5 interact with the upper 7 and lower 8 plates 1C) of EOS, and the calibrated rod 6 SV Ean with an exciter equipped with a measuring device (not shown). The matrix works as follows. The bulk material 9 is loaded into the inner hollow cylinder 1, the press is turned on, and the bulk material 9 is compressed by punches 4 and 5, which are driven by pieces 7 and 8 of the press, co-r responsibly. When the desired pressing force is reached, the press is turned off, and the calibrated rod 6 is pushed out of the compressed raw material 9 by means of a power tool. The axial force applied to the calibrated rod 6 is measured, and the pressure of the bulk material on the inside 34 is rendered the surface of the hollow cylinder 1. Based on these data, the coefficient of friction is further refined. The invention of the matrix device for the study of friction of bulk materials, made in the form of a hollow cylinder and load sensors, in that, for the purpose of a range of test conditions, it is installed with a flexible elastic tape covering the lateral surface of a hollow cylinder, and the load sensors are installed on a flexible elastic neirre. Sources of information taken into account during the examination 1. G. Bartenev and V. Lavrentiev, Friction and the contribution of polymers. L., Himi, 1972, p. 229.

2. USSR author's certificate number 518699, cl. QOIN 19/22, 1973 (prototype).