SU705272A1 - Weight measuring apparatus - Google Patents

Description

The invention relates to a weighing equipment, namely, the electric car. matic scales for measuring and screening by mass of small items and products. Automatic scales are known, which contain a crust, reference bearings, a load cup, an electrical balancing system, and a reading device 1. However, these scales do not have the Required accuracy and load capacity due to the displacement of the supporting elements. The closest in technical essence to the proposed is a device comprising a body, a yoke with a crossbar, suspensions with load-bearing platforms, supporting horizontal stretches and an automatic balancing system. However, this device has insufficient accuracy, tension and load capacity due to the possibility of shifting the rocker arms to supporting stretching and deformation of the latter under the action of the applied load. The purpose of the invention is to increase accuracy, reliability and load capacity. This is achieved by the fact that the weight measuring device is equipped with tiny stems and additional supporting elastic elements made in the form of intersecting suspensions located on opposite sides of the rocker arm, the lower ends of which are fixed on the crossbar of the rocker arm, and the upper ones on the brackets connected to the body. The intersection line of the suspension is chosen to coincide with the axis of the horizontal support bars. The brackets for fastening the upper ends of the overlapping hangers are made adjustable, with the possibility of moving along a circular arc with a radius equal to the working length of the suspension. FIG. 1 schematically shows a weighing device; in fig. 2 shows an embodiment of suspensions with an intersection line above the level of crop 3705 for the lower end (1i O); in fig. 3 variant with coincidence of the intersection line with the level of attachment of the lower ends (tl-0). The device contains a yoke 1 with crossbars 2, 3, frames 4, 5, adjusting and calibration nuts 6 and 7, mounted on supporting horizontal spans 8, 9 and compensation springs 10, 11. In addition, the rocker 1 is mounted on intersecting at an angle h, the suspensions are 12–15, where LUs are separated by a distance. along the crossbars 2, 3 of the rocker arms 1 and fixed on one side with the help of strips 16, 17 on it, and on the other side on brackets 18-21 connected to the body (base) 22. Intersecting line Oi - Og by suspension ( Fig. 1, Fig. 2) is chosen to coincide with the axis of the supporting horizontal stretch marks 8, 9. The height 1i of the intersection line O - Qg of the suspensions 12-15 is selected from the condition D $ h $ C, where C is the distance between the bottom end fixing levels suspensions 1215 on the crossbars 2, 3 of the rocker arms 1 and the upper ends of the suspensions 12-15 on the brackets 18-21. To reduce the size of the crossbars 2, 3, the height h is usually a value of h 0.1-0.2 C (Fig. 2), and if necessary, increasing the rigidity of the suspension line O-O 2 is set at a level close to or adjacent to the level of fixing the suspensions on the crossbars 2, 3 (.0) (Fig. 3), the brackets 18-21 are made adjustable to move by an angle ± along the arc of a circle with a radius of working length подвес of the suspension (Fig. 2); All and combining the line 0 - O2 intersection of suspensions; 12-15 with the axis supporting horizontal stretch 8, 9 and, therefore, to increase the accuracy and sensitivity of the balance. On the shanks 23-24 of the rocker arms 1 by means of the hinge elements 25, 26, suspensions 27, 28 with load-receiving platforms 29, 30 for the investigated loads and are mounted. containers} 31, 32. Magnetic systems 33, 34 interact with frames 4, 5 and create a balancing moment. High-frequency circuits 35, powered by generator 36, induce a LO uncompensation signal in frame 4 proportional to the unbalance angle L. €. rocker 1 with a phase determined by the direction of the imbalance. The uncompensation signal and U are fed through coupling capacitor 37 to faqch 2 sensory amplifier 38, transformed and amplified, and then fed through a CS resistor, the registrar 0 and through choke 41 (as a compensation current 3) into frames 4, 5. The device operates "The test load 31 and, if necessary, its tare 32 are placed on the platforms 29, 30. When the LP1 deviates, the weight hi of the load 31 is from the given value Scho (tare weight), or when working with zero tare (O) and when applying the load 31 with mass In y, rocker 1, rotating Cushion around 00 0 - Og generated, by: stretching 8, 9 and suspensions 12-15, tilts 1 at an angle fi. The non-sounding signal MJ, entering the amplifier 38, after conversion is fed as direct current 0 into frames 4, 5, creating a balancing moment M and driving the rocker 1 to the position of the initial equilibrium, when the measured mass is changed; LS is conducted according to the formulas; . ls, is the proportionality coefficient determined during calibration; 3i the value of the compensation current and its increment when the load 31 is applied and its weight is changed. Similarly, slaves and devices are sorted in mass sorting and sorting mode 31 by weight, when a signal is sent to the mass sensing mechanism from the recorder through the discriminator (not shown in Fig. 1) that carries the loads 31 to the corresponding bunkers. Invention 1. A weighing device comprising a body, a yoke with a crossbar, suspensions with load-bearing platforms, supporting horizontal extensions and an automatic balancing system, characterized in that, in order to improve accuracy, reliability and loading capacity, it is equipped with brackets and additional supporting elastic elements, made in the form of perekreprepchvayuschihsya suspensions, located on the paaHbie side kbrbmvgsla, the lower ends of which are fixed on the crossbar of the rocker arm, and the upper krsishteynah associated with the housing, wherein the break line is selected eevg.padayuschey suspensions with the axis of reference horizon EShNyh tensile rods. 2, the weighing device according to Claim 1, characterized in that the brackets for fastening the upper ends of the intersecting suspensions are made adjustable, with the possibility of moving along the arc Circles with a radius equal to the working length of the suspension. Sources of information taken into account in the examination 1. USSR author's certificate Nt 3499О5, cl. G 01 G23 / 36, 1970. 2. Author's certificate of the USSR N "455246 / cl. G 01 G 7/04, 1972 (prototype).

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