SU51158A1 - Device for testing strain gauges, shear gauges and clinometers - Google Patents

Description

Instruments for measuring deformations, irimeni smrle with the istapy of materials and finished structures, should periodically turn to determine the number of gear ratios. All mechanical devices for the intention of deformations, which are often consumed, can change their accuracy, since the individual parts of the device, such as: prisms, viites, etc., etc. they are exhausted, which is why they do not)) gear terms, and the device can give and show, does not correspond to their initial values.

For calibration of mechanical measuring devices there are various tools, naimers, calibrating machines of the Kiev Motor Power Station, measuring machines of the company “Soclete Genevoise, calibration machines of Zeiss, etc.

The first two of these machines have an accuracy of less than 0.001 mm, which is insufficient for calibrating instruments having the same degree of accuracy) 1. The Zeiss machine, due to the large clarity of the scale, gives the vozmongiosti to read by eye the des titys chieie shares of millimeters, but the reading still remains subjective.

In addition to this, the listed pipeipOBOHHbie mines make it possible to determine the gear ratio only for strain gauges and irogibomers.

The proposed universal calibration machine, which does not require a complex optical system, can produce calibration and measuring of various measuring instruments, 1; in general, strain gauges, shift meters, clinometers, and others, and linear measurements are measured objectively by dividing the scale with an accuracy of 0, 0001 mm, and, the angles of novorot, expressed in radians, are accurate to 0.000005.

Pa drawing FIG. 1 depicts a side view of the proposed device and fpg. 2, 8 - detail of the device in two, projections.

The device consists mainly of the base 1 (Fig. 1), on which the stand 2 is secured with a horizontal prism 5, and the table 14 on four racks. The stand and the table 14 support the lever 4, the length of which between the ravia supports is 1000 mm. Lever at one end oiiraets on the prism. 5 with facets at an angle of 60 (Fig. 1 and 2), attached to it, provided the ends of the pas with two nolucylpidrami 6, 7 with reference points of the prize in 5 sections, located at an angle of 45

to hornuong. At the other end of the ukropdep lever is a plank 8 with a cylindrical surface outlined along an arc of a radus of 1000 mm. Screw 9 is attached to the njtaHiio (a steel plate is extremely attached; a very flexible U plate that supports the lever on this side. Thus, the lever 4 is located on three oyors - two on the side of the prism 5 and one - and the opposite end, always retains a stable position. The plate U is attached to the stud 11, which, in turn, is integral with the noirrechina, which has a screw cut 12 in the middle, a screw thread. The sleeve is mounted on a micrometer viit 13, at the end of which there is a cylindrical thickening to rest on the table cover 14. Ends ioporechi They travel between the 15 and 16 fixed screws on the four legs of the table 14. For ease of adjustment, the guides have oval holes for the screws. At the end of the screw 13 there is a reinforced disk 17, which is divided into 200 parts.

At that end, the smallpox. where the stand 2 is located near the end of the stand, there are two supports 18, 19 with a strap 3. Between the stands 18, 19 and the stand 2 there is a stand 20 with a ball bearing at the top. At one level with nlaiki 3, a movable platform 21 (Fig. 1. 2, 3) is placed, which lies on the ball bearing of the rack 20 and on the cylindrical parts of the support part of the lever 4.

Platform 21 is connected to the cilipdric parts of the lever using steel strips 22 with a thickness of 0.1 mm. Tapes at one end are attached to the semi-cylinders. and the other to the sliders 23, with the movable micromotor screws 24. By turning these screws, you can tighten the straps 22 and adjust the position of the platform 21,

Nosredipepe lever 4 fortified square 25 and a little further level 26.

On this machine, you can calibrate clippers, strain gauges, shifters and some other measuring instruments.

By turning the micrometer screw 13, the lever 4 is rotated to the horizontal position, determined by the level 26.

The tested clinometer is attached to the square 25, the counts are taken on the clinometer scale and in the circle 17 are calibrated.

mappshy. Then the micrometer machine shifts into a certain number of divisions of L. Piiinair 4 at the same time, turning the angle and turning c1 around the edge of the prism 5. The lever length is 1000 mm, the course of the micrometric screw is wounded 1 mm, 200 divisions are applied to the disk; IRP Novorite micro-thrust screw on. divisions, the angle between the calipers and the subsequent position of the arm, calculated in radians, will be |)

Yes

200 1000 200000

If, then D 0,000005.

This value gives the price of one division.

Together with the lever, the clinometer will deflect to the same angle. Taking the second readout, but calculating the difference, the tapgeps of the angle of rotation of the gauge meter and C1) determine it with the angle of rotation of the fiber. Dividing the raziost of machinii counts by the raziost of the clinometer’s readings, the gülüchagot velnch1P1u coefficient of test device.

For tare calibration, the nose / tip is set by the id of the bar 3 and the iris on the platform 21. The unavailable movement of the platform 21 is achieved by tightening or lowering the lever 4 by means of a micrometer screw 13. When the lever is rotated, its supporting cylindrical part and rotating it rotate with it Leyta 22 leads to the outbound platform 21.

The distance from the rib of the iris 5 to the middle of the thickness of leite 22 is 20 mm. The length of the lever 4 from the smallpox of a prism 5 to the middle of the nlastpki 10 thickness is 1) avno 1000 mm. Therefore, with a microscopic vision of the microscope, the arm of the lever on 1 mm platform is placed on the ground:

  ° “2mm.

Since the tail end of the lever can be moved by V200 mm, turning the screw one division on the scale, the translational movement of the platform 21 can be carried out by the value:

S 0.0001 mm, tons ten times less than it can

measure strain gauge with one thousand magnification.

By calculating the difference between the readings on the scales of the calibration machine and the strain gauge, the values of the correction coefficient are determined, as in the cases, and in their cases.

The shifters for calibration are installed by two supports on the bar 3 at the points f and II. and the third support in the form of a prism edge with a feather is placed on the floor of the platform 21 at point III. A clamp for securing the iribor on the calibration machine snatches it to the fixed plate 3.

Moving platform 21 will cause point P1 to move to the position of lU.

By measuring this movement from the device readings, one can calculate the grating coefficient of the test slip meter.

The subject matter of the invention.

A device for testing strain gauges, shear meters and clinometers with p-rimepepium swivel around one of its ends of the lever, a platform moved in the horizontal direction and a micrometer absorbed to measure the movements of the free wheel (koic)), which is designed to transform the angular non-displacements of the swivel lever 4 to the horizontal movement of the testing platform 21, the lever 4 at one end to two semi-cylinders 6, 7 with 5 planes supporting the prism, angled nodes to each other, what are the cylinders serve to winding ua) 1ih strips 22 associated with the displaceable horizontally nanravlenik test ilatformoy 21.

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