RU62459U1 - DEVICE FOR CONTROL OF DYNOMETRIC KEYS - Google Patents

Abstract

The device relates to load-measuring equipment and can be used to configure or verify previously configured torque wrenches (torque screwdrivers) and limit. The purpose of the claimed device is to simplify the calculations when setting up and calibrating torque wrenches, provided that the accuracy of tuning, monitoring and testing of keys is improved. The essence of the utility model, which solves the problem, is that the device is made with a reduced center of mass (gravity) relative to the axis of rotation of the beam; in addition, a vertical scale of torque tolerance fields of adjustable torque wrenches is additionally introduced into the device.

Description

The utility model relates to load-measuring equipment and can be used for metrological maintenance of torque wrenches (screwdrivers).

A known torque meter containing a fixed base, in which is placed a square shank of the meter, made in the form of a housing, with which through the elastic zigzag radially arranged springs is connected the head of the axis of rotation with a socket for installing the test object, with the loading mechanism and the movable part of the reading unit, fixed part of which is located on the body, (AS No. 481802), 1975

The disadvantage of this device is the low accuracy and small calibration range associated with the need to take into account the initial moment of the sum of the bar weights for applying weights, levers of the graduated momentum and conductive wires.

A device for controlling torque wrenches (analogue) is also known, comprising a base on which a rotary mechanism is mounted, equipped with a replaceable connecting head into which a rotary frame with a pulley is inserted; as well as a square with a right angle between the sides, mounted on a rotary frame in a plane perpendicular to its axis, ensuring that one side matches the plane of symmetry of the pulley, and on the other side of the square a linear scale is made, (AS No. 1428954 A1), 1986 g.

The disadvantages of this device are:

1) insufficient accuracy of setting and checking torque wrenches, not corresponding to the normative and technical documentation on

torque wrenches (screwdrivers) used for normalized tightening of threaded connections.

2) insufficient performance with frequent tuning and verification of a large number of torque keys.

The purpose of the claimed utility model is to increase accuracy when setting torque wrenches and when monitoring and testing torque wrenches (screwdrivers), limit and scale, as well as simplifying calculations when setting and checking torque wrenches used when normalizing the tightening of threaded connections to values that meet the requirements of regulatory technical documentation.

This goal is achieved by the fact that the proposed device additionally introduced a vertical scale of tolerance fields (rocker angle) of the torques for which the keys are adjusted, which allows to visually note the accuracy of the key settings within the specified limits, as well as due to the reduced center of mass (gravity) of the rocker relative to axis of rotation. In this case, the sensitivity of the device (the moment of stragging - Mst.), Little depends on the load.

The device comprises a housing 1, on which a stand 2 is mounted, on which the axis 3 is mounted, which is the support (axis of rotation) for the rocker arm 4. The rocker arm 4 is balanced in horizontal position by nuts B and D and has four torque scales on its surface designed for the corresponding goods.

Two loads 5 are attached to the beam 4 symmetrically with respect to its axis of rotation to lower the center of mass (gravity) of the device and a removable frame 6 with a pointer 7.

A vertical scale 8 is attached to the housing 1 using the bracket 9 to determine the boundaries of the adopted torque tolerance field of the calibrated wrench in percent.

The device includes six weights 13, 14, 15, 16, 17, 18, as well as adapters 10, 11, which allow you to calibrate torque wrenches with right- and left-hand rotation.

On a vertical scale 8, when calibrating the device, the risk “O” is plotted (rocker 4 with indicator 7 in an unloaded state is in a horizontal position) and two risks one millimeter apart from risks “O” to determine the magnitude of the breakaway moment (sensitivity of the device). On a vertical scale 8, when calibrating the device, risks are shown indicating the boundaries of the accepted tolerance field from the microcircuit, on which the torque key is configured or checked.

To dampen the dynamic impact of the rotating rocker arm 4, when a custom torque wrench is triggered, the device has a buffer 12 made in the form of a rectangular rubber bar located on the surface of the housing 1.

The device operates as follows:

An adapter 10 or 11 is inserted into axis 3, the square of which corresponds to the square of the adjustable key or adapter, if the key is configured together with its adapter, and the direction of rotation of the key is taken into account. One of the six loads on the beam 4 is installed in a position in which this load creates the required MKR.

A load of 0.1 kg creates a microcircuit from 1 to 6 kgf cm

A load of 0.165 kg creates a microcircuit of 6 to 10 kgf cm

A load of 1.0 kg creates a microcircuit of 10 to 30 kgf cm

A load of 2.0 kg creates a microcircuit from 30 to 110 kgf cm

A load of 4.0 kg creates a microcircuit from 60 to 220 kgf cm

A load of 8.0 kg creates a microcircuit from 120 to 440 kgf cm

The key is inserted into the square hole of the adapter 10 or 11 and the adjustable key is rotated. The key is set until pointer 7

rocker 4, when the key is triggered, it will not be inside the tolerance field for the corresponding cargo applied on a vertical scale.

A variant of the inventive device was manufactured. According to the results of experimental measurements, it was found that, with the selected arrangement of the main points of the rocker arm (support, center of mass), the sensitivity (accounted for moment of breaking) does not depend on the load and you can get the division price of the rocker scales expressed by "round" numbers: 0.01; 0.05; 0.1; 0.2; 0.4; 0.8, which significantly increases the productivity of the witness, simplifying the calculations.

The design and the main characteristics obtained (including accuracy) correspond to the requirements of the normative and technical documentation for torque wrenches with an error of 2% or more, which allows the proposed device to be used for monitoring and testing (acceptance, periodic, for safety) keys (screwdrivers ) moment limit and scale.

The margin of error of the manufactured version of the claimed device did not exceed:

- in the range Мкр L ... 6 kgs.cm - not more than 1% of the measured (reproduced) value;

- in the range of MKR from 6 kg / cm to 440 kg / cm - not more than 0.4% of the measured (reproduced) value

(see GOST R 51254-99; Section 8, Clause 8.2.1.)

Claims (1)

A device for calibrating torque wrenches (screwdrivers), comprising a housing on which a stand with a bearing assembly and an axis is mounted, which is a support for a rotating beam with loads that create a custom torque (Mkr), characterized in that, in order to increase accuracy, simplify calculations in it, the beam is made with a reduced center of mass (gravity) relative to the support (axis of rotation) and connected to the body a vertical scale of the boundaries of the accepted tolerance fields (rocker angle) of the torques, which are set to amometric keys.