SU807134A1 - Device for determining mechanical properties of materials - Google Patents

Description

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The invention relates to a measurement technique, and specifically to devices for determining the mechanical properties of materials.

A device is known for determining the mechanical properties of materials, comprising a housing, a loading device made in the form of a spring with a lever transmission mechanism, a tip for supporting the sample, type of material to be followed, associated with the lever mechanism, and a recording device made in the form. pen attached to the lever mechanism, and the drive chart tape P.

The drawbacks of the device are the inequality of determining the mechanical properties of materials, associated with the presence of a lever mechanism that simultaneously serves for loading and recording, as well as the impossibility of determination; the profile of the sample material and its plastic properties, which is necessary, for example, when determining | with flat bakery products.

Closest to the proposed device is a device for determining the mechanical properties of materials, comprising a housing with a cylinder-shaped guide, a loading mechanism, and a spring and arresting device, which is used as a spring. a core electromagnet, a stem with a tip mounted in a guide and connected to a loading mechanism, a rod displacement sensor made in the form of a differential

O transformer and regulating unit 2.h.

However, the device has a relatively low detection accuracy. The mechanical characteristics of the materials associated with strong dynamic effects on the sample under study when the electromagnet is turned on and off, also does not allow simultaneously determining the elastic properties and profile of the sample under study.

The purpose of the invention is to improve the accuracy of the operating ...

This goal is achieved by

5 that the device is provided with perpendicular rods with an additional guide and lead screw with a drive and a carriage, the arresting device is made in the form of a reversing drive with a pulley and a cable, the rod displacement sensor is released

0 is not in the form of a potentiometer placed in the body, a finger / mounted on the rod, and a fork fixed on the axis of the potentiometer and encompassing the finger, the carriage is installed with the possibility of peremetseni on the additional direction and chassis; The springs are placed on the cylinder, one end supported on its cover, and the other connected to one end of the cable, the other end of which is fixed to the pulley. FIG. 1 of 6 kbeno device for determining the mechanical characteristics of materials, a general view in FIG. 2 - the same, top view; in fig. 3 shows section A-A in FIG. 2. A device for determining the mechanical characteristics of materials comprises a housing 1, a loading mechanism made in the form of a spring 2 and a locking device / as used by a reversible gear motor 3 with a pulley 4 and a cable 5, a rod 6 with a roller tip 7, guides in the form of a cylinder, 8 with bearings 9, - In which a rod b has a horizontal guide 10 and a lead screw 11 with a drive 12 fixed to the housing 1. On the guide 10 and screw 11 there is a carriage 13 on which cylinder bore 8 with rod b. The device also contains a displacement sensor of the rod b, made in the form of a potentiometer 14 mounted on the casing 1 using a collar 15 / pin 16 / mounted on the rod b, and a fork 17 mounted on the axis of the potentiometer 14 and spanning the finger 16. Signal from the potentiometer 14 is recorded on the registering unit 18. In case 1, a bolt 19 with a nut 20 is placed to secure the test specimen 21. On the rod b, the stopper 22 of its strokes is placed. A time relay is provided for switching on the actuator 12 (not shown in the drawings). The spring 2 is placed in the cylinder 8 and rests on its cover 23. A cable 5 at one end is fixed to the pulley 4 / and is connected to the other end of the free end of the spring 2.. A device for determining the mechanical properties of materials works as follows. In case 1, the test specimen 21 is fastened with a bolt 19 and nut 20. The carriage 13 is retracted to the extreme position and the actuator 12 is turned on, which causes the horizontal spindle 11. The carriage 13 moves along the guide spindle. This roll 7 rolls over the surface of the test sample 21 / moving the b rods and, accordingly, the finger 16. The plug 17 rotates, moving the slider of the potentiometer 14. The change in resistance of the potentiometer 14 is recorded by the recording unit 18. After a certain period time, defined by time relay, 12 is turned off, carriage 13 stops, after which time relay turns on gearmotor 3 / which starts winding cable 5 from shvik 4. Spring 2 begins to load the test sample 21 through rod 6 and roller 7 The indentation depth of the roller 7, as previously / is measured by a potentiometer 14. The deformation of the pre-calibrated spring 2 shows the pressing force. After that, the gearmotor 3 / is again turned on, which starts to wind the cable 5 on the pulley 4, the spring 2 is compressed, the rod 6 and the roller 7 unload the sample 21, the strain value of which is also recorded with a potentiometer 14. These operations are repeated on different parts of the sample 21 at switching on and off of the drive 12. According to the data obtained as a result of measurements, the mechanical properties of the material are judged. The application of the invention makes it possible to increase the accuracy of measurements by eliminating the dynamic effects on a sample of a material and providing measurement of the sample profile. Formula of the invention A device for determining the mechanical properties of materials / comprising a housing with a cylinder-shaped guide, loading mechanism made in the form of a spring and arrester, stem with tip, installed in the guide and connected to the loading mechanism, rod displacement sensor and recording flare, which is indicated by in order to increase the measurement accuracy, it is provided with perpendicular stem with an additional guide and spindle with a drive and a carriage, the arrester is made in the form of a reversing drive with a pulley and a cable / stem displacement sensor made in the form of a finger / mounted on the rod , and a fork fixed on the axis of the potentiometer and spanning a finger, the carriage is mounted for movement on an additional guide and lead screw / cylinder placed on the carriage, and the spring is placed in the cylinder / Simply supported at one end on the lid / .a another associated with one end of the cable / the other end fixed to the pulley.

Sources of information taken into account in the examination

1. Methods of studying the physicomechanical properties of agricultural plants. M., VISKOM, 1960, p. 226.

2 USSR author's certificate 610003, cl. G 01 N: / 42., G976 (prototype).

Claims (1)

Claim A device for determining the mechanical properties of materials, comprising a housing with a guide in the form of a cylinder, a loading mechanism made in the form of a spring and a retractor, a rod with a tip installed in the guide and connected to the loading mechanism, a rod displacement sensor and a recording unit, which are different that, in order to improve the accuracy of measurements, 'it is equipped with an additional guide perpendicular to the rod and a lead screw with a drive and a carriage, the arrestor is made in the form of a reversible drive with a pulley and cable, the rod displacement sensor is made in the form of a potentiometer located in the housing, a finger mounted on the rod, and a plug mounted on the axis of the potentiometer and covering the finger, the carriage is mounted for movement on an additional guide and threaded spindle, the cylinder is placed on the carriage, and the spring is placed in cylinder, one end supported on its cover, and the other connected to one end of the cable, the other end of which is mounted on a pulley.