RU70365U1 - DEVICE FOR TESTING WEIGHTS - Google Patents

Abstract

The utility model relates to weighing equipment and can be used in the metallurgical and other industries, for example, for checking crane scales for various technological purposes. The task to which the utility model is directed is to create a simple and reliable device for checking scales, in particular crane ones. The technical result is achieved due to the fact that due to the use of a traverse suspended on an earring with a point suspension in the form of a conical prism and a spherical pillow and a grip with two nuts and a bearing, the deviation of the force axis from the vertical is minimized and can be controlled by simple means without additional equipment . The essence of the technical solution lies in the fact that in the device for checking the scales, containing a hydraulic cylinder, a lever with a pillow and a prism, an exemplary force meter, articulated with a verified scale with a hook and a grip with an anchor bolt, a precision terminal, an exemplary force meter is mounted on a crossarm suspended on an earring, and the grip is fixed on the anchor bolt with two nuts with a bearing. In addition, the earring is equipped with a point suspension in the form of a conical prism and a spherical pillow, the lever is equipped with a platform for weights, and the hydraulic cylinder rod is spring-loaded with an elastic element.

Description

The utility model relates to weighing equipment and can be used in metallurgical and other industries, for example, for checking crane scales for various technological purposes.

A known method of verification of scales for static weighing, including crane, consisting in loading and unloading the scales with standard weights of the fourth category and ballast weights [1].

The disadvantage of this method in relation to heavy scales is the high complexity and high cost, because you must have a large set of model weights.

Also known, adopted for analogue, are verification schemes for crane weights containing a dynamometer and hydraulic press according to Figs. 2 and 4 of the indicated source [2].

The disadvantage of the analogue is that the schemes are speculative, theoretical in nature, as the authors themselves point out, for example, mentioning that

"The deviation of the axis of force from the vertical should not exceed 0.5 °", but without explaining how to achieve this difficult condition in production.

The objective of the proposed utility model is to eliminate this drawback and create a simple and reliable device for checking weights, in particular crane.

The technical result is achieved due to the fact that due to the use of a traverse suspended on an earring with a point suspension in the form of a conical prism and a spherical pillow and a grip with two nuts and a bearing, the deviation of the force axis from the vertical is minimized and can be controlled by simple means without additional equipment .

The essence of the technical solution lies in the fact that in the device for checking the scales containing a hydraulic cylinder, a lever with a pillow and a prism, an exemplary force meter articulated with a verified balance hook and grip with an anchor bolt, a precision terminal, and the exemplary force meter is mounted on a traverse suspended on the earring , and the grip is fixed on the anchor bolt with two nuts with a bearing. In addition, the earring is equipped with a point suspension in the form of

conical prism and spherical cushion, the lever is equipped with a platform for weights, and the hydraulic cylinder rod is spring loaded with an elastic element.

A general view of the device for checking the balance is shown in the figure.

The device for checking the balance contains a hydraulic cylinder 1, a rod 2 with an elastic element (for example, a spring) and a rotary stop 3 connected with a lever 4, supported through a prism 5 on a pillow 6. A conical prism 7 is installed on the lever 4, which together with a spherical pillow 8 forms a point suspension for the earring 9. On the axis of the earring 9 there is a traverse 10 into which an exemplary force meter 11 is mounted that can be rotated around a vertical axis, and is connected to a precision terminal 12. As an exemplary force meter 11, yt used a precision strain gauge, for example, type LS CAS firm.

Between the hook 13 and the gripper 14, calibrated scales 15, for example, crane scales, are built in. Grip 14 with a bearing 16 and nuts 17 is mounted on an anchor bolt 18, cast with concrete 19. To monitor the status of the calibrated scales 15, a scoreboard 20 is used, and in the interest of checking the lever 4 through the suspension 21, a weight platform 22 is fixed.

The device operates as follows.

Before starting work, the calibrated scales 15 are hung on the hook 13 and the gripper 14. Elements 7, 8, 9, 10, 11, 15 are balanced according to the readings of the precision terminal 12 by placing weights and weights on the platform 22. When the “mechanical zero” is obtained, wiggle - from hands - earrings 9 check the stability of the zero readings of the terminal 12. If the earrings 9 deviate from the equilibrium position after several oscillations, the zero readings of the terminal 12 are restored. Then, by loading the calibrated scales 15 with hydraulic cylinder 1, about 5-10% of the LEL (maximum weighing limit) is checked for “verticality” of the axis of force on the load, tapping on the gripper 14 with a hammer and choosing a stable maximum value for terminal 12.

After that, making sure that the position of the elements 7, 8, 9, 10, 11, 13, 15, 14, 16, 17 of the power axis is correct, in accordance with the requirements of clause 2.3 of GOST 29329-92 (3), loading is performed using hydraulic cylinder 1 verified weights 15 in ranges

From 20s to 500s; margin of error ± 1e;

from 500s to 2000s; margin of error ± 2e;

over the 2000s. margin of error ± 3e;

(e is the price of calibration; errors are given in the modes during operation and after repair).

Verification is carried out by loading the standard load meter 12 and calibrated scales 15 with a hydraulic cylinder 1. The rod 2 with an elastic element serves to dampen loading (unloading) unevenness caused by imperfections in the hydraulic cylinder 1 design and possible impurities in the reagent (oil). During verification, the readings of the precision terminal 12 and the scoreboard 20 of the scales being verified are read at the same time 15. At the required points of the characteristics of the scales 15, the oil supply to the hydraulic cylinder 1 is stopped by a valve (not shown in the figure).

In total, three cycles of loading and unloading are carried out. In the transition from loading to unloading at the terminal 12 and the scoreboard 20 check the constancy of zero readings, which should not exceed ± 1e. In three values of the scale, in accordance with the requirements of clause 3.3.8 of GOST 8.453-82, the sensitivity of the weights 15 is checked by applying weights-tolerances weighing from 1 to 1.4 e on the platform 22 and checking the corresponding change in readings on the scoreboard 20.

If the errors correspond to the norms, verified scales 15 are branded and put into production.

Currently, a prototype for the implementation of the device at the enterprises of heavy industry of the Ural region has been developed and tested.

Claims (3)

1. A device for checking the scales, containing a hydraulic cylinder, a lever with a pillow and a prism, an exemplary force meter articulated with a calibrated hook and a grip with an anchor bolt, a precision terminal, characterized in that the exemplary force meter is mounted on a traverse suspended on the earring, and the capture is fixed on the anchor bolt with two nuts with a bearing. 2. The device according to claim 1, characterized in that the earring is equipped with a point suspension in the form of a conical prism and a spherical pillow, and the lever is equipped with a platform for weights. 3. The device according to claims 1 and 2, characterized in that the hydraulic cylinder rod is spring loaded with an elastic element.