Dynamoelectric linear actuator with sealing and lubricating, shock-absorbing and overload protection structure

Abstract

The invention discloses a dynamoelectric linear actuator with a sealing and lubricating, shock-absorbing and overload protection structure. The dynamoelectric linear actuator comprises a motor, a sliding sleeve, a screw rod and a threaded sleeve matched with the screw rod; a rubber buffer cushion is arranged between the sliding sleeve and the end plane of the threaded sleeve; and an electric cylinder also comprises a corrugated extension tube, a pull pressure sensor and a controller. According to the dynamoelectric linear actuator, the screw rod is sealed through the corrugated extension tube, so that the problem that the screw rod is rusted and damaged due to the contact between steam and the screw rod can be avoided; by setting the rubber buffer cushion between the sliding sleeve and the threaded sleeve, the axial impact force on a thread pair of a screw rod mechanism can be buffered so as to avoid the damage of the thread pair caused by the axial impact force; and by setting the pull pressure sensor in the end part of the sliding sleeve, when the pull pressure sensor detects that the load of the electric cylinder is increased to the ultimate load, the controller controls the motor to stop working so as to perform the overload protection on the electric cylinder to avoid the overload damage of the electric cylinder and to prolong the service life of the electric cylinder.

Description

technical field [0001] The invention relates to a driving device, in particular to an electric cylinder. Background technique [0002] The electric cylinder is a driving device that uses a motor to drive a screw mechanism (such as a sliding screw, a ball screw) to convert rotary motion into linear motion. The structure of the electric cylinder includes a motor, a reducer, a screw mechanism, a sliding sleeve and a supporting structure for supporting the sliding sleeve. [0003] The existing support structure includes a support tube connected to the reducer housing, a guide seat fixed on the front end of the support tube and slidingly matched with the sliding sleeve, and a screw rod for fixing the guide seat. The support structure has many components, complex structure, large volume and high manufacturing cost. [0004] Moreover, the sealing structure of the existing electric cylinder is relatively poor, and the air is easy to directly enter the sliding sleeve so that the sc...

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Problems solved by technology

[0007] In view of this, the purpose of the present invention is to provide an electric linear drive with sealing lubrication, shock absorption and overload protection structure, to solve the technical problems that the screw mechanism of the existing electric cylinder is easy to rust, wear and tear; The medium electric cylinder does not have the function of shock absorption and buffering. During the working process of the motor starting, stopping, reversing, etc., the screw drive pair is subject to a large impact force and is easy to damage the technical problem; and solve the technical problem that the electric cylinder lacks overload protection

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