SU1298510A1 - Device for checking radius of cutting edge round - Google Patents

Abstract

The invention relates to a measuring technique and can be used to control the radii of blunting (sharpness) of the cutting edges of knives and the shearing elements of shears of choppers and other cutting machines, as well as agricultural machines. The purpose of the invention is to improve the accuracy and productivity of control by reducing the time to perform installation operations and moving monitored objects relative to the base prism, as well as ensuring the possibility of direct readings of the monitored value without intermediate calculations. A device for controlling the radius of blunting the cutting edge of an object contains a base prism, on one of the faces of which a resistive sensitive element 6 is placed, made, for example, in the form of a resistive film electrically insulated from its surface. On the other side of the base prism, a controlled object 4 is placed, brought into electrical contact with a resistive sensitive element 6 by its cutting edge. Depending on the magnitude of the blunting radius, their contact zone is located at different distances from the end of the resistive element. The position of the contact point on the sensitive element and, therefore, the magnitude of the blunting radius is judged by the electrical resistance of the area of the resistive element located between its point of contact with the object being monitored and one of its terminal leads. The electrical resistivity is measured, for example, with an ohmmeter connected to the base prism and the terminal terminal of the resistive element. 1 hp f-ly, 5 ill. (L

Description

one

The invention relates to a measurement technique and can be used to control the radii of blunting (sharpness) of the cutting edges of knives and the shearing elements of shears and other cutting apparatus, as well as agricultural machines.

The purpose of the invention is to improve the accuracy and performance of control by reducing the time to perform installation operations and moving controlled objects relative to the base prism, as well as to ensure the possibility of direct measurements of the controlled value without intermediate calculations.

FIG. 1 shows a schematic of a device for controlling the radius of the cutting edge of the nozzle, in which the internal angle of the base prism exceeds 90 °; in fig. 2 - the same, with the internal angle of the base prism equal to

12

90

in fig. 3 - the same, with a curve-25

 five

but the convex face of the inner corner of the base prism; in fig. 4 - the position of the contact area of the cutting edge, depending on the size of the radius

The cleaned object 4 is placed on the plate 1 and brought into contact with the resistive 5 element 6. Depending on the radius of bluntness of the cutting edge of the object 4, its contact point with element 6 will be located at different distances from the end of the resistive element 6 (figure 4). As a result, the electrical resistance, controlled by the electrical measuring device 7, uniquely determines the radius of blunting of the cutting edge. With the help of standard tools having predetermined radii of cutting edge blunting, the device can be

,, graduated directly into the unit; in fig. 5 - graduated

on the characteristics of the device.

See the controlled value or provided with a calibration schedule (figure 5).

The device for controlling the cutting edge blunting radius contains a base prism that can be executed, for example, in the form of rigidly fixed at an angle to one another plate 1 and plate 2. One side of the internal corner of the base prism, for example face 3, is designed to be installed on it - object 4, and on the second face 5 a resistive sensitive element 6 is placed, electrically insulated from it by a dielectric layer. Element 6 can be made in the form of wire, foil or resistive film. Plate 1 and the resistive element 6 are attached to an electrical measuring device 7, for example an ohmmeter. The controlled object 4 placed on the plate 1 in the process of measurement and brought into electrical contact with the element 6 forms a closed electrical circuit with them.

The angle between the plates 1 and 2 of the base prism is selected depending on the angle between the chamfers of the cutting edge of the test object 4 or its position

fO

jn 25

85102

on the plate 1 (Fig.1 and 2). To control the sharpness of the shear elements, determined by the radius of blunting their cutting edge, the face 5 of the plate 2 can be made curved with a curvature directed toward the face 3 with a controlled object placed on it (FIG. 3).

The device works as follows.

The cleaned object 4 is placed on the plate 1 and brought into contact with the resistive 5 element 6. Depending on the radius of bluntness of the cutting edge of the object 4, its contact point with element 6 will be located at different distances from the end of the resistive element 6 (figure 4). As a result, the electrical resistance, controlled by the electrical measuring device 7, uniquely determines the radius of blunting of the cutting edge. With the help of standard tools having predetermined radii of cutting edge blunting, the device can be

zo

See the controlled value or provided with a calibration schedule (figure 5).

Thus, to control the radius of blunting (sharpness) of the cutting

35 the edges need only one setting of the object on the base prism, and the value of the controlled value is measured directly on the scale of the measuring device,

40 which improves the control performance by a factor of ten.

Claims (2)

1. A device for monitoring the cutting edge blunting radius, containing a base prism, one face of which is intended to be installed on the object to be monitored, and a measurement unit, characterized in that, sensitive element placed on the second facet of the base prism and electrically insulated from it, and the plug between the resistive sensitive element and the base prism of the electrical measuring device 31298510, 4 2. The device according to p. 1, tln is curved with a bulge, such that the second face of the first prism facing the first face: i neither curvature neither 2 Fig.Z Figm .55JO Sharpness U, mm x Yu FIG 5 Editor S. Patrushev Compiled by L. Guskov Tehred M. Khodanich Proofreader G. Reshetnik Order 874/39 Circulation 678 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5  | - "g vvviv t mmmju" "-i v MaK" v v ". Production and printing company, Uzhgorod, st. Project, 4