SU914941A1 - Crane electromechanical balance - Google Patents

Description

The invention relates to weighing technology, in particular to devices for weighing suspended loads.

Known crane scales, containing a strain gauge, built-in hook suspension and connected to an automatic step-type signal compensator [1)

However, such scales do not provide the required accuracy.

Also known are systems for the remote transmission of measurements using a two-channel mining of the angle of rotation of a coarse and precise reference [2].

The closest in technical essence to the present invention are crane electromechanical scales, containing a force-measuring sensor in the form of a measuring spring installed in a housing, interacting with a lifting hook, and a selsyn sensor, and a recording unit with an indicator connected to an engine connected to a selsyn-receiver associated with a selsyn - sensor (3].

The disadvantage is its low accuracy due to the lack of compensation for changes in the characteristics of 2

measuring spring, as well as the accuracy of the selsyn transmission of indications.

The purpose of the invention is to improve accuracy.

This goal is achieved by adding an additional selsyn sensor to the load measuring sensor of a crane electromechanical balance, lowering and increasing gearboxes, a bar, pulleys and a thrust bearing, and an additional selsyn receiver, selector and variator are inserted into the recording unit, and the lifting hook is set to a thrust bearing mounted in a housing supported on a measuring spring, along the axis of which a rod is mounted, which interacts with pulleys mounted locally with gearboxes and agricultural machinery s-sensors on the plates, one ends of which are hinged, and others - are tightened by a spring, wherein the axis of one pulley is associated through a reduction gear with selθ Sin-sensor, and the other pulley is connected with the additional axis of the encoder

through the boost gearbox.

Selsins-sensors and selsins-receivers

are connected between themselves, by the double scheme of measuring the angle of error.

914941

3

FIG. 1 shows a diagram of the device; in fig. 2 - load sensor, slit; in fig. 3 - the same, longitudinal section.

Crane electromechanical scales consist of a force-measuring sensor 1 connected with a recording unit 2 (Fig. 1).

Load sensor 1 (Fig. 2 and 3) consists of body 3, which, through measuring spring 4, rests on bearing disc 5 fixed on rod 6. In the lower part of body 3 on thrust bearing 7, a lifting hook 8 coaxially is mounted and held by nuts 9 and 10. Above the body 3, a casing II is provided, which serves to protect the mechanisms enclosed therein from the effects of the environment, in which pulleys 13 are placed on the axes 12, made, for example, of rubber or with gummed peripheral surfaces. The pulleys 13 are engaged with the rod 6 and through the axis 12 are kinematically connected with the reduction and raising of the speed of the pulleys 13 gears 14, which are kinematically connected with the rotors of the sensor 15 sensors, for example, the contactless type BD-404 or BD-501A. The pulleys 13, the gearboxes 14 and the selsyny sensors 15 are mounted on the plates 16 pivotally mounted on the axes 17. The plates are tightened by the spring 18 and the pulleys 13 are thereby pressed in order to avoid slipping to the rod 6. In the casing, a transformer 19 is installed to increase the safe voltage supplied through the cable 20, the voltage required to excite selsyn sensors 15. On the casing 11 there is a sleeve 21, which has a thread outside and a tapered surface on which the wedges rest 22. A nut 23 is screwed onto the sleeve, which serves to move in the axial direction wedges 22, by means of which the cable 20, which connects the sensor 1 with the recording unit 2, is clamped. The rod 6 from above has a structure for hanging on a cable or a hook of a lifting mechanism conventionally cut off in the drawing. The recording unit 2 (Fig. 1) contains a precision resolution receiver 24, a gross resolution receiver 25, a reduction gear 26, an executive engine 27, a variator 28, for example, a friction one. The Executive engine 27 is installed in the case when the power of the selsyn receivers 24, 25 coarse and accurate counting will be insufficient to actuate the recording and summing devices of the reading device 29. The selector 30, for example, with nonlinear resistances, is used to adjust the signals of the selsyn receivers 24, 25, and the amplifier 31 - to amplify their signals.

Scales work as follows.

The load or force is applied to the lifting hook 8 and causes the "body 3

compress the measuring spring 4 by moving the housing 3 with the pulleys 13, the gearboxes 14 and the selsyns-sensors 15 mounted on it. The rod 6 is suspended, for example, on the cable lifting mechanism and stationary. The pulleys 13, being in engagement with the rod 6, rotate when the load is applied before it is balanced by the spring 4 and transmit the movement through the axles 12 and the gearboxes 14 to the sensor 01 sensors. In this case, the rotation to the gauge gauge 15 slows down, and the gauge gauge 15 accurate readout is accelerated with the help of gearboxes 14. The rotors of the selsyn receivers of the coarse 25 and exact readings 24 work out the corresponding angle of rotation. The movement from the selsyn-receiver of the exact count 24, which is affected in the direction of adjusting the movement from the selsyn-receiver of the rough count 25, is transmitted to the gearbox 26, which allows to obtain the necessary momentum after the selsyns-receivers 24, 25.

Then the movement is transmitted to the executive engine 27.

The signals of the selsyn circuit are corrected in the selector 30, amplified in the amplifier 31 and sent to the executive motor 27. After the executive motor 27, a variator 28 is installed, for example, friction, which is used to adjust the speed of the reading device 29 to compensate for measuring the rigidity of the measuring spring 4. Variator 28 is made with the ability to repeatedly change the speed after a negligible value corresponding to a change in the stiffness of the measuring spring. This adjustment is made when lifting the reference weight. After the variator 28, the movement is transmitted to a reading device 29 containing known recording and summing devices and may contain a typewriter for issuing a certificate of the quantity of cargo. The ability to have several receivers from one sensor makes it possible to monitor the work of many lifting mechanisms from one point, for example, a control room.

Claims (2)

Claim 1. Crane electromechanical scales, containing a force-measuring sensor in the form of a measuring spring installed in the housing, interacting with a lifting hook, and a selsyn-sensor, and a recording unit with an indicator connected to an engine connected to a selsyn receiver associated with a resolver, differing in that, in order to increase accuracy, an additional axial gauge was added to the load sensor, reducing and increasing the gearboxes, the rod, pulleys and the thrust bearing, 914941 6 and an additional selsyn receiver, a selector and a variator are introduced into the registering unit, with the lifting hook mounted on a thrust bearing mounted in a housing supported on the measuring spring, along the axis of which a rod is mounted that interacts with pulleys installed in conjunction with gearboxes and selsini sensors on the plates, one ends of which are mounted on hinges and dugie - tightened spring, wherein the axis of the pulley ₁₀ through the conductive ponizhayu- reducer is connected with the encoder, and the other pulley is connected with the axle additional selsyn sensor through a step-up gearbox. 2. Scales in π. 1, characterized in that the selsyns sensors and selsyns receivers are connected by a double scheme of measuring the angle of error.