SU998884A1

SU998884A1 - Force measuring machine

Info

Publication number: SU998884A1
Application number: SU813348340A
Authority: SU
Inventors: Иван Иванович Харитонов; Геннадий Александрович Павлов
Priority date: 1981-08-24
Filing date: 1981-08-24
Publication date: 1983-02-23

Description

Изобретение относитс к приборостроению и- может быть использовано при создании средств тарировки или поверки силоизмерительных динамометров .The invention relates to instrument making and can be used to create means of calibration or verification of force-measuring dynamometers.

Известны силоизмерительные машины дл тарировки динамометров, содержащие грузовой рычаг, первого рода с посто нным соотношением плеч, указатель равновеси рычага, захваты, черв чную передачу дл уравновешиванм грузового рычага, т гу с грузами fl J-.Load-sensing machines for calibrating dynamometers are known, which contain a cargo lever, of the first kind with a constant ratio of arms, a lever balance indicator, grippers, a worm gear for cargo lever balancing, a load with cargo fl J-.

Однако эти машины отличаютс сложностью изготовлени пары призмаподушка . Трудност ми изготовлени этой пары ограничиваетс повьааение верхнего предела измерени машин этого типа, который достигает 2000 кН. Чувствительность системы под нагрузкой и точность воспроизведени приложеннойсилы в основном определ ютс качеством изготовлени этой пары. Прогиб плеча рычага-под нагрузкой измен ет соотношение плечей , что снижает точность воспроизведени нагрузки.However, these machines are distinguished by the difficulty of making a pair of prism cushions. The difficulty in fabricating this pair is limited by increasing the upper limit of the measurement of machines of this type, which reaches 2000 kN. The sensitivity of the system under load and the accuracy of reproduction of the applied force are mainly determined by the quality of manufacture of this pair. The deflection of the lever arm under load changes the ratio of the shoulders, which reduces the accuracy of the load.

Наиболее близкой по технической сущности и достигаемому эффекту к изобретению вл етс машина дл проверки динамометров, сЬдержаща исполнительный гидроцилиндр с плунжером , рабочий стол, траверсу, груэопоршневой манометр, состо щий из плунжера с площадкой дл грузов, систему гидропитани и систему пенсации утечек t lТочность известной маишны снижаетс за счет имеющейс силы трени , завис щей от прилагаемой нагрузки.The closest to the technical essence and the achieved effect to the invention is a machine for checking dynamometers, which holds an actuating hydraulic cylinder with a plunger, a working table, a traverse, a piston piston manometer consisting of a plunger with a cargo platform, a hydraulic feeding system and a leakage sensing system - an exact name of a machine reduced by the available friction force, depending on the applied load.

а также изменени эффективной пло10 щади плунжера при действии рабочего давлени .and also changes in the effective area of the plunger under the action of the working pressure.

цель изобретени - повышение точности силойэмеритальной машины.The purpose of the invention is to improve the accuracy of the force of the measuring machine.

15 Поставленна цель достигаетс тем, что в машину, содержащую основание , неподвижную и подвижную рамы, датчик давлени и силовозбудитель, состо щий из цилиндра и подвижного15 The goal is achieved by the fact that a machine comprising a base, a fixed and movable frames, a pressure sensor and an exciter consisting of a cylinder and a movable

20 плунжера, введены силоизмерительные датчики, размещенные между цилиндром и подвижной рамой, св занной с подвид- ными плунжером, силовозбудитель снабжен неподвижным плунжером, жестко20 plunger, load sensors placed between the cylinder and the movable frame connected with subspecific plunger, the energizer is equipped with a fixed plunger, rigidly

25 св занным с неподвижной рамой, а цилиндр снабжен рубашкой, образующей с наружной его стброны полость противодавлени . 25 is connected with a fixed frame, and the cylinder is provided with a jacket, which forms a backpressure cavity with its outer bolster.

При этом выходы силоизмерительныхThe outputs of the load

Claims

30 sensors and a pressure sensor are connected to the input of the comparator, and its. i; tjxo; i is connected to the registering R.Oooru. The drawing shows schematically the proposed machine, a general view. The force-measuring machine comprises a base 1, a fixed frame 2, a movable frame 3, a power driver 4, a pressure sensor 5, a recording device 6. A stationary plunger 7 of the power driver is connected to a fixed frame and a movable plunger 8 - with a mobile frame. A jacketed cylinder 9 forms a backpressure cavity 11, which allows the effective area of the cylinder to remain unchanged. By means of force-measuring sensors, the cylinder 12 is connected to the moving frame. A calibrated dynamometer 13 for compression is installed in the zone between the plates of the fixed and movable frames. The rotatable dynamometer 14 for stretching is installed in the zone between the movable frame and the base. The outputs of the force-measuring sensors and the pressure sensor measuring the pressure in the cylinder, proportional to the load produced, are connected to the input of the comparison device 15, the output of which is connected to the recording device. The force gauge work as follows. . A test object is installed in the test area. Fluid is supplied to the working cavity of the energizer 4 until the pressure in it becomes equal to the pressure for this load step. In this case, the movable plunger 8 will pass some way by moving the movable frame 3 and the force-measuring sensors 12 cylinder through. During the forward movement, the sensors 12 will be stretched due to the frictional force between cylinder 9 and plugs (the weight of the cylinder for sensors 12 and the weight of all moving parts for sensor 5 compensated). A signal proportional to this force will be subtracted from the readings of the pressure sensor 5, by means of which the pressure proportional to the load applied to the dynamometer is measured. JipH reverse stroke sensors 12 will be compressed due to the strength of the tracks and their readings will be added. These operations are carried out in the comparison device, and the resultant force is recorded by the recording device. Thus, P Fp j T, where P is the force transmitted to the dynamometer being tested; f - eff1 is the effective area of the working cylinder; J P - pressure in the system; T is the power of friction. Taking into account the accuracy of existing pressure sensors and load sensors, with the proposed technical solution, the accuracy of a force-measuring machine should not be less than 0.1% of the measured value. Claim 1. A measuring machine comprising a base, a fixed and movable frame, a pressure sensor and an exciter consisting of a cylinder and a movable plunger, characterized in that between the cylinder and the movable frame connected to the movable plunger, the energizer is equipped with a fixed plunger rigidly connected with the fixed frame, and the cylinder is equipped with a jacket that forms an opposite cavity events. 2. The machine according to claim 1, wherein, a recording device and a comparison device are inputted into it, the input of which is connected to the outputs of the force-measuring sensors and the pressure sensor, and the output with the recording device. Sources of information taken into account during the examination 1.Avdeev BA Technique for determining the mechanical properties of materials. M., 1965, s, 113-114.

2. USSR author's certificate number 323687, cl. G 01 L 25/00, 16.03.70.