Disclosed is a built-in type electric driving system of a machine tool. The system is capable of directly connecting a motor, which drives a spindle in a lathe which processes a workpiece, to an outer surface of the spindle without using a belt to rotate the spindle, and is capable of selectively transferring the power of the motor to a rotation system including a drawbar and a spindle for driving a chuck using a clutch device.

A zero-point clamping device for centered locking of an object with repeat accuracy, the device comprising: a housing, a receiving opening worked into the housing having a centering axis, at least two clamping slides mounted axially displaceably in a bore provided in the housing, and an actuating element for moving the clamping slides, one axis of rotation of the actuating element running tangentially and at a distance from the receiving opening to enable a reliable, permanent and repeatable fixing of a large number of workpieces and being extremely compact. This is achieved with two spaced-apart threads incorporated in the actuating element, the respective threads of which have identical pitches and are inclined in opposite directions, and a drive pin inserted in each thread in a driving connection with the thread such that the drive pins can be moved along the axis of rotation of the actuating element.

A high-precision tensioning device is provided. The high-precision tensioning device is composed of a stepping motor, an encoder, a harmonic reducer, a rotary table, connecting rods, contacts, force sensors, a rotary table connecting piece, a gasket, a nut, bolts, a set screw, a shell and an end cover. The tensioning device provided by the disclosure can achieve closed-loop control on a tensioning force in order to improve the tensioning precision of the tensioning device; and as long as machining and assembling errors meet design requirements, stable synchronous tensioning of three contacts can be ensured, and the location precision of a hub is improved.

A power chuck includes a housing in which there is arranged a drive unit having a traction guide means moveable in the direction of a clamping axis. There, and there are arranged two pairs of mutually diametrically opposite base jaws. The base jaws are guided radially, in the housing substantially perpendicularly to the clamping axis, and the drive unit is adapted to convert the movement of the traction guide means into the movement of the base jaws. According to the invention, it is proposed that the drive unit for each base jaw has a slider which is in engagement with the base jaw and which is moveable with a movement component on a circular path about the clamping axis.

A securement device for a press tool including an angular exterior body having a side wall. A multitude of ratcheting bodies are located around a top edge of the exterior body. The ratchets include a ratchet bar. The ratchet bar has a plurality of ratchet grooves that allow the ratchet bars to be slide inward toward the interior of the exterior body and to be locked into place. An interior body is located within the exterior body such that it can be moved about and provide extra support for the ratchets.

A securement device for a press tool including an angular exterior body having a side wall. A multitude of ratcheting bodies are located around a top edge of the exterior body. The ratchets include a ratchet bar. The ratchet bar has a plurality of ratchet grooves that allow the ratchet bars to be slide inward toward the interior of the exterior body and to be locked into place. An interior body is located within the exterior body such that it can be moved about and provide extra support for the ratchets.

An aluminum alloy hub lathe fixture, which includes a main plate, a mounting seat, a hydraulic power clamping head, a pull rod, a sliding seat, a connecting pin, a fan-shaped clamping jaw, a sealing cover, a deflection block, a deflection shaft, a centrifugal force balance block, a centrifugal mechanism base, a spring and screws, wherein the main plate and the mounting seat are connected together through screws, so that a housing of the entire fixture is formed; the hydraulic power clamping head is fixed on the mounting seat through screws; one end of the pull rod is mounted on the hydraulic power clamping head through screws, and the other end of the pull rod is connected with the sliding seat through the connecting pin; the fan-shaped clamping jaw is fixed on the sliding seat through screws.

A main shaft fixture for fixing a main shaft on a wind turbine during installation and repair work on heavy parts of the wind turbine nacelle, in the case where the fixture is formed of several sections for mounting on stable structural parts in the nacelle, including the nacelle's bottom frame. The main shaft fixture has adjustable pressure mandrels with tap shoes, which cause the fixture to be usable regardless of the turbine main shaft geometry, such that it can be mounted without fixing the rotor. The main shaft fixture also has facilities for mounting of a lightweight crane and a self-hoisting crane with a ground-based winch, respectively, as well as a rotor lock which, in combination with actuators of the main shaft fixture, enables the main shaft and the main shaft bearing to be sufficiently displaced vertically from its bearing in the nacelle to service or replace the bearing.

A device (1) for controlling operation of a chuck (2), the device (1) comprising a chuck (2) for centering a workpiece (3) to be machined; at least one electric motor (6) connected to at least one moveable clamping jaw (4), the at least one movable clamping jaw (4) being configured to be selectively moved by the at least one electric motor (6); a first inductive transmission device; a second inductive transmission device (8) disposed in alignment with the first inductive transmission device (7) such that measurement signals and/or electric power are inductively transmitted between the first transmission device (7) and the second transmission device (8); and an external control device (11) by means of which command and monitoring data required for the operation of the at least one clamping jaw (4), and for the operation and locking of the electric motors (6) can be entered and/or read.

A device (1) for controlling operation of a chuck (2), the device (1) comprising a chuck (2) for centering a workpiece (3) to be machined; at least one electric motor (6) connected to at least one moveable clamping jaw (4), the at least one movable clamping jaw (4) being configured to be selectively moved by the at least one electric motor (6); a first inductive transmission device; a second inductive transmission device (8) disposed in alignment with the first inductive transmission device (7) such that measurement signals and/or electric power are inductively transmitted between the first transmission device (7) and the second transmission device (8); and an external control device (11) by means of which command and monitoring data required for the operation of the at least one clamping jaw (4), and for the operation and locking of the electric motors (6) can be entered and/or read.