Pneumatic and electric hybrid drive linear actuator

Abstract

The invention discloses a pneumatic and motor-hybrid driven linear actuator in the technical field of mechanical transmission, and comprises a motor, a screw rod, a cylinder sleeve, a casing nut and a first piston, wherein two sides of the cylinder sleeve are provided with a left end cover and a right end cover respectively; the motor is fixed at the outer side of the left end cover and is connected with the screw rod; the casing nut is arranged in the cylinder sleeve, one end is connected with the screw rod and the other end is arranged in the first piston; the first piston separates the cylinder sleeve into a left cavity and a right cavity; the left end cover is provided with a first air way communicated with the left cavity; the right end cover is provided with a second air way communicated with the right cavity; the first piston is provided with a sealing section, the sealing section is provided with a micro cylinder structure along the radial direction, and is provided with a third air way communicated with the right cavity and the micro cylinder along the axial direction; the micro cylinder is internally provided with a second piston; and the casing nut is correspondingly provided with a first through hole matched with the second piston. Advantages of pneumatic driving and motor driving can be combined, and quick and high-precision and repeated positioning on a fixed stroke can be realized.

Description

technical field [0001] The invention relates to a technology in the field of mechanical transmission, in particular to a pneumatic and motor hybrid drive linear actuator. Background technique [0002] A cylinder is a pneumatic actuator that converts the pressure energy of compressed air into mechanical energy, used to provide linear reciprocating motion or swing, output force and linear velocity or swing angular velocity. The positioning accuracy of ordinary standard cylinders is 1mm, and the working pressure is between 0.05MPa and 1MPa. Generally speaking, the positioning accuracy of the cylinder position control system is low, and the output load force is small, but its working speed is fast, it can quickly reach the target, the operation is simple, and the price is cheap. It is suitable for low precision and load requirements, and does not require intermediate positioning or Simple occasions that require only a few intermediate anchor points. Although the cylinder posit...

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Problems solved by technology

[0005] According to the prior art, the present invention can only realize high-precision positioning in a single direction, and the direction of the load is single, and the positioning accuracy in the opposite direction is not high. Due to the shortcomings of working condition requirements such as high-precision bidirectional loading and repeated positioning, a pneumatic and motor hybrid drive linear actuator is proposed, which can combine the advantages of pneumatic drive and motor drive, and quickly achieve 90% of the target stroke through the cylinder structure, and then through the motor The leading screw accurately complements the remaining stroke, and realizes fast and high-precision repeated positioning of fixed stroke under the action of bidirectional load

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