FIELD: machine building.
SUBSTANCE: invention relates to machine building and can be used as a training model for the study of compression spring stiffness. Device contains devices for arrangement of compression spring, device for spring compression, device for measuring change in length of compressed spring, device for measuring the compression force of the investigated spring at separate moments; at that, during the tests, the investigated spring is placed vertically. Length of the compressed spring is changed by rotation along the helical line of the stop acting on the upper support surface. Measurement of change in length of compressed spring ΔL is carried out by counting the number of revolutions of this stop during its rotation during downward movement along this helical line. In order to measure at certain moments the value of the force with which the investigated spring is compressed, weights suspended on a strong thread are used. This thread has loops providing convenience for placement of loads. This thread is suspended at one end of the balanced rocker. This rocker in the middle part is hinged to the fixed support. Other end of this rocker by means of auxiliary parts simultaneously rests against the fixed support and against the lower end of the compressed spring. Arm of gravity of the suspended load relative to the axis of rotation of the rocker arm should be equal to the arm of the resultant force on the side of the compressed spring relative to the axis of rotation of the rocker arm. When the force from the side of the compressed spring is equal to or exceeds the weight of the weights suspended on a strong thread, this rocker arm moves away from the parts connected to the fixed stop, and the lower support platform of the spring is displaced downwards. Compression spring stiffness Ccomp is calculated from the ratio: Ccomp=ΔP/ΔL, where ΔL is change in spring length caused by load change ΔP.
EFFECT: enabling analysis of compression spring stiffness without using expensive equipment so that this device can be made by itself and so that procedures when using the disclosed device as a training model for investigating the stiffness of compression springs are more clear and understandable.
1 cl, 3 dwg
