Hydraulic expansion device

Abstract

The invention discloses a hydraulic expansion device. The hydraulic expansion device comprises a cylinder body, a piston, a piston rod, an expansion block installing seat, expansion block mechanisms,a mandrel, an electromagnetic valve, a power supply, a hydraulic pump, a pressure relay, springs, a manual reversing valve and an oil box; the piston is slidably connected to the inner cavity of the cylinder body; the piston rod is fixedly connected with the piston, and cone parts are axially arranged on the piston rod; sliding grooves are formed in the expansion block installing seat; expansion blocks are fixedly connected with radial-direction sliding blocks, the radial-direction sliding blocks are slidably connected to the sliding grooves in the expansion block installing seat, and cone faces are arranged on the radial-direction sliding blocks; the mandrel is rotatably connected with the expansion block installing seat, an oil outlet port of the hydraulic pump communicates with an oil inlet port P of the electromagnetic valve, an execution port A of the electromagnetic valve communicates with an oil inlet port P of the manual reversing valve, and an execution port A of the manual reversing valve communicates with a non-rod cavity of the cylinder body; and the power supply, the pressure relay and a terminal of the electromagnetic valve are electrically connected in sequence and form a circuit. The hydraulic expansion device cannot make parts be scrapped because of big expansion force, and cannot make the parts be loosened because of small expansion force when the parts are machined.

Description

technical field [0001] The invention relates to a hydraulic tensioning device. Background technique [0002] When processing typical thin-walled cylindrical parts, when the coaxiality between the outer circle and the inner hole is high according to the design requirements, in order to ensure the machining accuracy, a hydraulic expansion device is usually used, but the hydraulic expansion device in the prior art, its The adjustment of the expansion force depends entirely on the operator's own experience and feeling. When processing typical thin-walled cylindrical parts, if the expansion force is too large, the clamping deformation of the thin-walled cylindrical parts will be too large and the parts will be scrapped. , if the expansion force is too small, the thin-walled cylindrical parts will loosen during processing due to insufficient expansion force. Contents of the invention [0003] The object of the present invention is to provide a hydraulic tensioning device which ...

AI Technical Summary

Problems solved by technology

[0002] When processing typical thin-walled cylindrical parts, when the coaxiality between the outer circle and the inner hole is high according to the design requirements, in order to ensure the machining accuracy, a hydraulic expansion device is usually used, but the hydraulic expansion device in the prior art, its The adjustment of the expansion force depends entirely on the experience and feeling of the operator. When processing typical thin-walled cylindrical parts, if the expansion force is too large, the clamping deformation of the thin-walled cylindrical parts will be too large and the parts will be scrapped. , if the expansion force is too small, the thin-walled cylindrical parts will loosen during processing due to insufficient expansion force

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