Machining center main shaft tool loosening and tool unloading mechanism

Abstract

The invention discloses a machining center main shaft tool loosening and tool unloading mechanism which comprises a machine body, a shaft core and a pulling rod assembly. The mechanism further comprises a supporting seat, a cylinder body, a piston and a limiting unit. The side wall of the supporting seat is bent and extended to form a first baffle; the cylinder body can move up and down relative to the machine body; the limiting unit is fixedly connected with the shaft core and is applied to prevent the cylinder body from moving upward continuously; a second baffle is fixed to the cylinder body; the first baffle, the side wall of the supporting seat, the second baffle and the side wall of the cylinder body are enclosed together to form a closed first reset air chamber; the piston is flexibly positioned in the cylinder body and divides the cylinder body into a second reset air chamber and an oil chamber; the cylinder body is provided with an air passage; the air passage enables the first reset air chamber and the second reset air chamber to communicate, and the end, communicating with one end of the second reset air chamber, of the air passage forms a vent end; the piston is also used to seal the vent end. The machining center main shaft tool loosening and tool unloading mechanism can avoid the great striking between the cylinder body and the limiting unit, and adopts the air pressure reset to replace resetting by reset springs to avoid the strain of a machining center main shaft.

Description

technical field [0001] The invention relates to a tool loosening and unloading mechanism, in particular to a machining center spindle tool releasing and unloading mechanism. Background technique [0002] At present, the broach release device of the spindle of the machining center is mainly composed of a release mechanism, a broach structure and a reset mechanism. According to the release method, it is mainly divided into mechanical type and gas-hydraulic type. The gas-hydraulic loose broach mechanism is mainly composed of an oil cylinder assembly, a pull rod assembly, a pull claw assembly, and a return spring. During the spindle loosening process, the hydraulic oil enters the cylinder body of the oil cylinder and pushes the piston of the oil cylinder to move. The pull rod assembly moves under the drive of the piston, and the pull rod assembly pushes the claw assembly to move. During the movement, the return spring is compressed, and the return spring is pressed The tool rel...

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Problems solved by technology

[0004] However, the loosening and unloading structure in the comparison document uses a spring to reset the piston. During frequent use of the broaching tool, the spring will be fatigued and worn, and may even be fatigued and fractured, which will affect the reliability and service life of the spindle loosening and broaching device. Furthermore, when the cylinder body moves backward relative to the body under the action of hydraulic oil, a stronger impact is likely to occur between the cylinder body and the unloading plate, resulting in poor stability of the unloading tool unloading mechanism

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