SU838527A1

SU838527A1 - Instrument for measuring static friction coefficient

Info

Publication number: SU838527A1
Application number: SU792740259A
Authority: SU
Inventors: Игорь Валентинович Семенов; Виктор Иванович Горячко
Original assignee: Ленинградский Ордена Ленина Политех-Нический Институт Им. M.И.Калинина
Priority date: 1979-03-22
Filing date: 1979-03-22
Publication date: 1981-06-15

Description

(54) ПРИБОР ДЛЯ ОПРЕДЕЛЕНИЯ СТАТИЧЕСКОГО КОЭФФИЦИЕНТА ТРЕНИЯ(54) DEVICE FOR DETERMINING THE STATIC FRICTION COEFFICIENT

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Изобретение относитс к измерительной технике и может быть использовано при излучении фрикционных свойств материалов.The invention relates to a measurement technique and can be used in the emission of frictional properties of materials.

Известен прибор дл определени статического коэффициента трени ,содержащий основание, размещенные на нем держатель контробразца, держатель образца, узел нагружени , взаимодействующий с держателем образца , привод перемещени образца и узел регистрации коэффициента тре- ни tl.A known device for determining the static coefficient of friction comprises a base, a counter-sample holder, a sample holder, a loading unit that interacts with the sample holder, a sample movement actuator and a node for detecting the coefficient of tl.

Недостатком известного прибора вл етс низка точность определени коэффициента трени при регистрации малых усилий сдвига.A disadvantage of the known instrument is the low accuracy of determining the coefficient of friction when registering small shear forces.

Цель- изобретени - повышение точ.ности определени коэффициента трени .The purpose of the invention is to improve the accuracy of determining the coefficient of friction.

Цель достигаетс тем, что привод перемещени образца выполнен в виде закрепленного на основании блока, охватывающей его гибкой нити, стержн , закрепленного на другом конце нити и взаимодействующего с держателем образца, и охватывающей стержень пружины, котора одним концом закреплена на нем, а другим - на держателе образца, узел регистрации выполненThe goal is achieved by the fact that the drive for moving the sample is made in the form of a rod fixed on the base, covering its flexible thread, fixed to the other end of the thread and interacting with the sample holder, and covering the spring rod that is fixed to it at one end and sample holder, registration unit is made

в виде дискового реохорда, установленного на основании с возможностью вращени относительно оси, параллельной оси вращени блока, имеющего диск, взаимодействующей с гибкой нитью, а держатель образца включен в электрическую цепь управлени электродвигателем .in the form of a disk junction mounted on the base with the possibility of rotation about an axis parallel to the axis of rotation of the block having a disk interacting with a flexible thread, and the sample holder is connected to the electric motor control circuit.

На фиг. 1 представлена схема при0 бора дл определени статического коэффициента трени ; на фиг. 2 - вид А на фиг. 1.FIG. Figure 1 shows a tool pattern for determining the static coefficient of friction; in fig. 2 is a view A of FIG. one.

Прибор содержит основание 1, держатель 2 контробразца 3, держатель 4The device contains a base 1, the holder 2 of the contra-sample 3, the holder 4

5 образца 5, узел 6 нагружени , привод перемещени держател 4 образца 5, выполненный в виде блока 7, гибкой нити 8, стержн 9, пружины 10, узел регистрации коэффициента трени , вы0 полненный в виде дискового реохорда 11, диск 12 которого взаимодействует с нитью 8. Блок 7 приводитс во вращение электродвигателем 13, На оси 14 размещены реохорд 11, барабан 15, 5 of sample 5, loading unit 6, movement actuator of holder 4 of sample 5, made in the form of block 7, flexible thread 8, rod 9, spring 10, friction coefficient registration unit, made in the form of disk rheochord 11, disk 12 of which interacts with the thread 8. Block 7 is driven into rotation by an electric motor 13. On the axis 14 a reochord 11, a drum 15 is placed,

Claims

5 connected by a flexible thread 16 with a holder 4 of sample 5, a moving contact 17 of the reichord 11. A spring 18 is placed between the reohord 11 and the drum 15. The electrical control circuit of the electric motor 13 includes the control unit 19 and the recording equipment 20. The device operates as follows Sample 5 mounted on a counter piece 3. A holder 4 is connected to a spring 10. A motor 13 is turned on, which causes the block 7 to rotate on which the bending thread 8 is wound. As a result of this bending, the thread 8 rotates a disk 12 placed on the flow axis 11, stretching the spring 10. The breaking of the electrical contact of the rod 9 with the contact of the holder 4 of sample 5 gives a signal to the control unit 19 to start recording the shear force with the aid of the recording equipment 20. Initially, the sample 5 remains stationary, stopping the drum 15 and the movable contact with the flexible thread 17 of the reichord 11. The rotation of the reichord disc 11 relative to the contact 17 determines the deformation of the spring 10, and when the shearing force reaches the limit corresponding to the static coefficient of friction, it will slip Sample 5 relative to counterblade 3, while the tension of the spring 1 depends on the dynamic coefficient of friction. As a result, the sample begins to slide rapidly, the spring 1 is compressed, and the movable contact 17 of the reichord 11 held by the thread 16 begins to slide under the action of the spring 18 in the direction of movement of the reo chord 11. The control unit 19 uses a differential device to register a decrease in shear and gives a signal to reverse the engine. As a result, the deformation of the spring 10 begins to decrease, the mmmmmi mm stop stops, the rod 9 terminates the stop circuit of the electric motor 13. Using this device allows you to increase the accuracy of determining the static coefficient of friction to reduce the complexity of the experiment. The invention The device for determining the static coefficient of friction, containing the base, placed on it the holder of the counterbrake, the sample holder, the loading unit that interacts with the sample holder, the drive for moving the sample and the recording unit for the coefficient of friction, characterized in that in order to increase the accuracy of determining the coefficient of friction , the drive for moving the sample is made in the form of a block fixed on the base, covering its flexible thread, a rod fixed on the other end of the thread and interacting About the sample holder, and the spring enclosing the rod, which is fixed at one end to it, and the other to the sample holder, the registration unit is made in the form of a disk reichord mounted on the base rotatably about an axis parallel to the axis of rotation of the block having a disk interacting with a flexible thread, and the sample holder is connected to an electric motor control circuit. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 545904, cl. G 01 N 19/04, 1977 (prototype).

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