SU989319A1 - Device for automatic measuring of deformation - Google Patents

Description

The invention relates to a measurement technique, and more specifically to automatic, successive systems for measuring strain. ;

Devices for measuring strain are known, comprising a housing with guides, two carriages with drives, mounted on the tensioning guides, two receivers placed on the carriages AND connected to the drive control circuits t.

The disadvantage of such devices is the low measurement accuracy due to the influence of test machines on the measuring system of the device.

The closest to the technical essence of this invention is a device for automatic measurement of deformations, comprising a housing with guides, two carriages installed on a guideline, illuminators and two pairs of photo receivers installed on carriages in the slits near the sample, two electromechanical measuring channels whose inputs are connected to. and podk11: registrar 12 them

A disadvantage of the known device is the low measurement accuracy.

caused by the influence of deformations of the sample on the location of the base elements, the possibility of disruption from the assembly. marks and destruction of the measuring system for large defoals.

The purpose of the Invention is to increase the accuracy of measurements by spacing Ex base elements and measuring devices, as well as eliminating the influence of the test sample on the device for automatic measurement of deformations.

Claims (2)

The goal is achieved by the fact that a device for automatic measurement of deformations, comprising a housing with guides, two carriages mounted on directions such as illuminators and. Two pairs of photodetectors installed on KapeTkax, two electromechanical measuring channels, the inputs of which are connected to the photodetectors and the recorder connected to them, are equipped with two levers that are articulated on a 25-plane carriage perpendicular to the movement of the carriages, one shoulder-lever is made as spring capture, the other in the form of a counterweight, and a pair of photo-detectors NIKOV and illuminators installed on the side of the counterweights. Fig. 1 shows a device, a general kinematic scheme; Fig. 2 shows a layout of photodetectors and arms with grippers. The device for automatically measuring deformations consists of a body | Ca 1 with guides 2 on which two carriages 3 and 4 with illuminators 5 and two pairs of photodetectors 6 and 7, two levers 8 and 9, which are hinged on carriage 3 and fixed 4, one arm of the levers 8 and 9 is made in the form of spring grippers 10 and 11, and the other in the form of counterweights 12 and 13, and the pair, the photodetectors 6 and 7, and the illuminators 5 are installed on the side of the counterweights 12 and 13; as two channels 14 and 15 tracking, connected to the general recorder 16, Slave that the device is carried out as follows. Spring clamps 10 and 11 are mounted on sample 17, on the borders of the deformable zone. The luminous flux from the illuminators 5 falls on a pair of photodetectors 6, which produce a differential electric signal that controls the one of the tracking channels 14, which moves the carriage 3 until the illuminance of the pair of photodetectors 6 becomes equal, t, e, counterweight 12 is not placed in a horizontal position. The second channel 15 works in the same way. When the sample 17 is deformed, the grippers 10 and 11 move the levers 8 and, which causes the deflection of the counterweights 12 and 13, t, e, to change the illumination of the pairs of photodetectors b and 7, and the corresponding channels 15 and 14 move the carriages 3 and 4 until the luminance of the pairs of photodetectors b and 7 is equal. The channels 14 and 15 are mechanically connected to the recorder 16, which records the movements of the carriages 3 and 4, t, e, which measure the amount of deformation of the sample. Thus, an automatic contact device with respect to the sample and contactless with respect to the photocurrent device has the recognition of both contact and contactless systems. We have advantages over each of them in the sense that, as a contact one, it has minimal mechanical effect. , as a contactless one, it does not have any spreading during the deformation of the marks, and, consequently, disruptions of the photosequences. devices with tags, by design and due to the presence of contact systems, it is actually possible to test samples both at elevated and at low temperatures, as well as in aggressive media and in vacuum, since only contact systems can be introduced into the test chambers, eliminating the effects of temperatures and aggressive media on photosequence devices. The use of a device for automatic remote measurement of deformations improves the measurement accuracy, eliminating the distortion of the base, top, and reduces the influence of external factors on the operation of the device. DETAILED DESCRIPTION OF THE INVENTION Device for automatic measurement of deformations, comprising a housing with guides, two carriages mounted on guides, optical fibers and two pairs of photodetectors mounted on carriages, two electromechanical measuring kanbsha whose inputs are connected to photodetectors, and a recorder connected to them characterized in that, in order to increase accuracy, it provides 1o with two levers hinged on carriages in a plane perpendicular to the movement of the carriages, one lever arm is made in ide pruzhiInogo capture another - in the form of a counterweight, and a pair of photodetectors and illuminators installed by counterweights, information sources, the received note in the examination 1, USSR Author's Certificate № 326454, cl. G 01 B 11/16/1970, 2. USSR author's certificate 632898, class, G 01 B 11/16, 1978 (prototype)