SU109055A1 - Inductive Torsi Dynamometer - Google Patents

Description

The subject of the invention is an inductive torsional dynamometer for determining torques and axial forces on an electric drill spindle used for drilling rocks.

The so-called inductive torzometers are known for measuring only torques and dynamometers for measuring axial forces.

The peculiarity of the proposed torsi-dynamometer is the combination of two transducers in one instrument integrated into the electric drill chuck, one designed for measuring torques and the other for measuring axial forces.

The drawing shows a General view of the torsi dynamometer in the section.

The torsional dynamometer consists of two structurally integrated inductive converters installed on the site of the conventional cartridge 1 of the electric drill 2 and working independently of each other.

The inductive transducer of 3 torques is made according to

type of inductive transducers. Torsiometers without contact device.

When the shaft 4 is twisted under the action of a torque, the air gaps between the teeth of the rings 5, 6 V. 7, which are fixed on the shaft 4, change. These gear rings, together with the air gaps between them, are part of the magnetic circuit of the two coils 8, placed in the stator 9.

A change in air gaps entails a differential change in the inductances of the respective coils. Both coils 8 constitute the adjacent arms of a bridge circuit with a three-winding transformer. In the absence of the moment the circuit is balanced. The circuit imbalance is proportional to the measured torque.

The inductive axial force transducer consists of four coils 10 with cores 11 and bark 12 placed in guide grooves and slots of the bronze bushing 13. The guide grooves and sockets are oriented so that the two cores are located to the right of their

coils, and the other two to the left. The cores // are secured in a bronze bushing 13 and are fixed relative to the annular end of the elastic element in the form of a ring 14. Anchors 12 are fixed to the flange 15 and are stationary relative to the same elastic element 14.

The cores and the measles are positioned so that an elastic shaft 4 can freely pass through the central part of the elastic element 14, which is connected to the h5 spindle cartridge with keys and, on the other hand, to the drill rod cartridge 17.

The shaft, perceived and transmitted torque, does not transmit axial force due to the possibility of free movement along the cylindrical sockets of the cartridges 16 and 17.

The axial force is transmitted from the chuck 16 chuck to the chuck 17 bu. THE COMBINE rod through the elastic element 14 and to the body of the inductive

transducer 3. The transducer sensitivity can be adjusted by setting the initial air gaps.

Subject invention

Inductive torsi-dynamometer for determining torsional MOIMeHs and axial forces on an electric drill spindle, used for drilling rocks, characterized in that, in order to combine torque and axial forces measurements in one device, the torsi-dynamic transducer absorbs the integrated drill-tube in one tool, inducible a torque meter transmitting torque through an elastic shaft, and an axial force transducer consisting of four magnetic coils with cores and barks placed in guide grooves and sleeve sockets, and a spring element in the form of a ring, which simultaneously serves as a housing for positioning bushings with rolls therein.