SU1293472A1 - Device for checking linear displacements of objects - Google Patents

Abstract

The invention relates to a measurement technique and can be used to control the length of moving objects. The purpose of the invention is to increase the control accuracy by taking into account the change in the actual diameter of the measuring roller. The cross-section of the frame 2 and the distance between the supports 8 are such that the deformation of the frame in the direction of the force P I of pressing the roller to the object of control is always equal to or close to the total deformation of the roller and its support from the force of force R. In the process of operating the device, changing the dimensions and shape the working surface of the roller leads to a change in the total gap between the working surface of the roller and the frame. The transducers 5 provide the voltage correction circuit 7, corresponding to the deviation of the working surface of the roller from the calculated one. The converter 6 registers the change in the gap between the frame and the object 9 of the control. Thus, corrections to changes in the diameter of the roller are introduced into the measurement result. 1 hp f-ly, 1 ill. with f (L

Description

The invention relates to a measurement technique and can be used to control the length of moving objects.

The purpose of the invention is to improve the control accuracy by taking into account the change in the actual diameter of the measuring roller.

The drawing shows the device, a general view.

The device comprises a housing 1, a frame 2 with a measuring roller 3 and a transducer 4 of rotation angle of the measuring roller, two converters 5 for changing the diameter of the roller, a converter 6 for deforming the frame. Transducers 5 and 6 are electrically connected to the inputs of correction circuit 7. The frame is installed in the housing using ball bearings 8.

The cross section of the frame 2 and the distance between the supports 8 are such that the deformation of the frame in the direction of the force F pressing the roller to the object of control is always equal to or close to the total deformation of the roller and its support from the action of force R.

For the case when the measuring roller is a continuous cylinder loaded with a force distributed over the width of the contact area, the magnitude of the elastic decrease in the diameter of the roller due to the total compression of the cylinder is determined by the formula

ud

Jll

2BE ,,

where B is the width of the roller;

Ep is the modulus of elasticity of the material of the roller.

The deformation of the frame in the direction of the force P is determined by the formula

f

РР

48EI

where is the distance between the supports 8, E is the modulus of elasticity of the material

framework; I - the moment of inertia of the transverse

frame section.

To ensure equality, in which the frame deformation transducer provides information corresponding to the deformation of the roller from the same force P, the cross-sectional shape and the length of the frame are determined from the relation

I f

In p 241 E

The device works in the following 5th way.

When the object 9 is moved, the roller 3 rotates and at the output of the converter 4 a number of pulses appear, the number of which is proportional to the displacement measured. Pulses are recorded by a counter (not shown in the drawing). When the total gap between the working surface of the roller 3 and the frame 2, which occurs during the operation of the device due to the change in the size and shape of the working surface of the rollers, is changed, the converters 5 deliver to the correction circuit 7 a voltage corresponding to the working surface deviation

roller surface from the calculated. Converter 6 registers the change in the gap between the frame and the control object 9, which occurs due to the elastic deformations of the roller to

to the object.

Thus, corrections to changes in the diameter of the roller are introduced into the measurement result.

35

Claims (2)

1. A device for monitoring linear displacements of objects, comprising a housing with supports, a frame with a measuring roller mounted on the supports, and a transducer angle of rotation of the measuring roller, characterized in that, in order to increase the control accuracy, it is equipped with two radially located relative to the axis of rotation of the roller and transducers of diameter change of the roller placed on the frame, transform of the frame deformation from the force of pressing the roller to the object of control into an electrical signal and the correction circuit , Inputs connected to the output of the converter. 2. The device according to claim 1, characterized in that the cross-sectional shape and frame length are determined from the ratio 3124: 4724 I B - the width of the roller; Р 241 Е elastic modulus of the material where I is the moment of inertia of the roller; frame sections; E is the modulus of elasticity of the material; L is the distance between the supports; 5 frames.