RU2313775C1 - Laboratory bench for measuring of mass, coordinates of the center of the mass and the powers influencing an object - Google Patents

Abstract

FIELD: the invention refers to machine building and may be used for modeling the process of measuring the position of the center of load, of powers influencing an object particularly for modeling disassembly-assembly works and determination stability of the technological equipment with unfastened supporting contour.

SUBSTANCE: the bench has a platform, a steering stub, clamps, a hydro cylinder, a hydraulic system, a fastening plate, a lever, a horizontal shaft, a hydro distributor, rods, supporting struts, beams, vertical pillars, springs, bushings and a measuring system including resistance sensors and overloading sensors. The resistance and overloading sensors are glued to the rods and the lever, and the measuring systems has also in-series connected a filter, a strain amplifier, an analog-digital converter, a computer and also potentiometers which are installed on the horizontal shaft and a steering stub.

EFFECT: allows modeling conditions of fulfillment of disassembly-assembly works, reduces time and increases accuracy of measured values in real regime of time.

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Description

The invention relates to the field of mechanical engineering and can be used to simulate the process of measuring the position of the center of gravity, the forces acting on an object, in particular, to simulate disassembly and assembly operations when determining the stability of technological equipment with an loose support contour.

A known bench for diagnostics, repair and running in ICE containing a platform, inside of which there is a horizontal shaft with a lever and a pivot pin with a mounting plate, as well as a hydraulic cylinder, hydraulic system and control valve, with which the lever is lifted, while on the horizontal shaft and the rotary trunnion located clamps. [one]

The disadvantages of this device include the fact that the design of the stand does not allow it to be used for laboratory tests when measuring mass, coordinates of the center of mass and forces acting on an object in real time.

A device for weighing goods on lifting machines containing measuring resistance sensors and an overload sensor is known. [2]

The closest in technical essence is a complex for measuring mass, coordinates of the center of mass and moments of inertia of engineering products, containing support racks with rods holding the beams, on which springs and vertical racks with sliding sleeves are located. [3] / prototype /

The disadvantages of these devices include the fact that taking readings of measured values from sensors in real time is a complicated and inconvenient process.

The objective of the invention is to simulate the conditions for disassembly and assembly work, reducing time and improving the accuracy of the measured values in real time.

The problem is solved due to the fact that in the laboratory bench for measuring the mass, coordinates of the center of mass and forces acting on the object, containing supporting posts with rods holding the beams, on which springs and vertical posts with sliding sleeves connected to the platform are located inside which contains a horizontal shaft with a lever and a pivot pin with a mounting plate, as well as a hydraulic cylinder, hydraulic system and control valve, with the help of which the lever is lifted, the measuring system subject, including resistance sensors and overload sensors, while the clamps are located on the horizontal shaft and the rotary trunnion, according to the invention, resistance sensors and overload sensors are glued to the rods and the lever, and potentiometers mounted on the horizontal shaft and the rotary trunnion are introduced into the measuring system, and sequentially connected filter, strain gauge, analog-to-digital converter and computer.

Figure 1 shows a laboratory bench for measuring mass, the coordinates of the center of mass and the forces acting on the object; figure 2 - view A; figure 3 shows a diagram of the inclusion of measuring devices.

A laboratory stand for measuring mass, coordinates of the center of mass and forces acting on an object (Fig. 1) consists of support posts 1 with rods 2, holding beams 3 with longitudinal beams 4, on which springs 5 and vertical posts 6 with sliding sleeves 7 are located connected to the platform 8. Inside the platform 8 there is a horizontal shaft 9 with a lever 10 and a pivot pin 11 with a mounting plate 12 using the hydraulic cylinder 13, the hydraulic system 14 and the control valve 15, the lever 10 is lifted, on the horizontal shaft 9 and rotated For this pin 11, the latches 16 are located. The measuring system consists of resistance measuring sensors 17 glued to the rods 2, overload sensors 18, potentiometers 19 mounted on the rotary pin 11 and the horizontal shaft 9, the filter 20, the strain gauge 21, the analog-to-digital converter 22 and Computer 23. Object of repair 24.

The laboratory stand works as follows. On the mounting plate 12 of the pivot pin 11, the object of repair 24 is fixed (example ICE) and disassemble or assemble. The signals from the resistance measuring sensors 17 glued to the rods 2 and the overload sensors 18 are fed through a filter 20, a strain gauge 21, an analog-to-digital converter 22 to a computer 23. Moreover, to determine the position of the object in space on the rotary pin 11 and horizontal shaft 9 are installed potentiometers 19, which determine the angle of the object in space.

To determine the coordinates of the center of gravity (t. P) of the object, we use the expression

where L _x is the longitudinal base of the measuring installation, m;

L _z - the transverse base of the measuring installation, m;

- смещение центра тяжести относительно оси поворота рычага, м;

- displacement of the center of gravity relative to the axis of rotation of the lever, m;

l ₀ - mounting height of the object, m;

R ₁ , R ₂ , R ₃ , R ₄ - reaction force acting along the axes of the rods, N.

To determine the height of the center of gravity, we use the design feature of the stand and translate the repair object into a horizontal position using the hydraulic cylinder 13, the hydraulic system 14 and the valve 15 and, according to formula (3), determine the height of the center of gravity.

Modeling the conditions for disassembling and assembling work, reducing time and improving the accuracy of measured values in real time is achieved due to the fact that a computer is used to record readings from sensors.

Information sources

1. A.S. USSR No. 91342, class G01G 3/12.

2. RF patent No. 2261348, cl. F02B 79/00, G01M 15/00, 09/27/05. Bull. Number 27.

3. V.V. Bogdanov, B.C. Volobuev, A.I. Kudryashov, V.V. Travin. Complex for measuring masses and moments of inertia of engineering products // Measuring equipment, 2002, No. 2, p. 37-39.

Claims (1)

A laboratory bench for measuring mass, coordinates of the center of mass and forces acting on an object containing support racks with rods holding the beams, on which springs and vertical racks with sliding sleeves are located, connected to the platform, inside of which there is a horizontal shaft with a lever and a pivot pin with a mounting plate, as well as a hydraulic cylinder, a hydraulic system and a control valve, with the help of which the lever is lifted, a measuring system including resistance sensors and sensors overloads, while on the horizontal shaft and the pivot pin there are latches, characterized in that the resistance sensors and overload sensors are glued to the rods and the lever, and potentiometers mounted on the horizontal shaft and the pivot pin, and the filter, strain-relief amplifier connected in series, analog-to-digital converter and computer.

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