Servo electric cylinder

Abstract

The invention relates to a servo electric cylinder, which comprises a cylinder body, a screw, a screw nut, a piston and a piston rod. The servo electric cylinder also comprises a locking device, a cylinder body clamping slot and a clamping ring capable of contracting and expanding in the radial direction. The locking device comprises a displacement limiting mechanism and is arranged between the piston and a sliding connection part so that the piston can slide for a preset distance relative to the axial direction of the sliding connection part; the cylinder body clamping slot is arranged in the peripheral inner sidewall of the cylinder body; when the clamping ring is contracted, the clamping ring is arranged between the piston and the sliding connection part, the outer circle of the clamping ring is matched with the inner wall of the cylinder body in a sliding way; and the clamping ring can be expanded in the radial direction and embedded in the cylinder body clamping slot under matching effects of approaching of the piston and the sliding connection part. The locking device of the servo electric cylinder of the prior art has the defects of over complex structure and high costs of manufacturing, installation and maintenance, therefore, the invention provides the servo electric cylinder which has the advantages of simple structure and low costs of manufacturing, installation and maintenance.

Description

technical field [0001] The invention relates to an electric cylinder, in particular to a servo electric cylinder, which belongs to the field of motors. Background technique [0002] Servo electric cylinder is a modular product that integrates servo motor and lead screw. It converts the rotary motion of servo motor into linear motion. It has the advantages of precise speed and position control, so it is widely used. [0003] Chinese patent document CN101106297A discloses a three-stage ball screw electric cylinder. The servo motor drives the first-stage screw to rotate through a two-way overrunning clutch. The cylinder body is connected, while the second-stage hollow screw rod is fixedly connected with the second-stage nut, the third-stage nut is fixedly connected with the push rod, and the other end of the push rod is connected with the earring. [0004] The above-mentioned Chinese patent documents use a two-way clutch, a one-way clutch and their matching parts to self-lock ...

AI Technical Summary

Problems solved by technology

If only the first-stage ball screw is considered, the self-locking locking structure is completed by the one-way clutch and its matching parts. However, even for a single-stage ball screw, the locking structure is too complicated, that is, The inner ring of the one-way overrunning clutch is fixed on the first-stage nut, the outer ring of the one-way overrunning clutch is fixed with the sleeve, and a thrust ball bearing is installed on the sleeve, and the other side of the thrust ball bearing is installed on the slider. The block is covered with a spring, and the spring is pressed by the slider and the cylinder block. The cylinder block and the middle block are fixedly installed on the first-stage inner cylinder. The sleeve and the middle block can slide axially relative to each other. The friction plate is installed on the end face, and the sleeve presses the friction plate on the middle block

Therefore, when using the three-stage ball screw electric cylinder in the above-mentioned patent document, once a certain part is damaged and needs to be repaired, because of its complex structure, the inspection is time-consuming and laborious, and it is also difficult to repair and replace after checking out that a certain part is damaged. It is time-consuming and labor-intensive, and with so many components, the cost of manufacturing and installation is also high

[0005] Moreover, when the above-mentioned Chinese patent literature adopts a two-way clutch and a one-way clutch to self-lock the ball screw, it needs the motor to continuously provide power and carry out force balance with the load on the earring. The self-locking device provided by this patent document has been subjected to reaction force for a long time, the overrunning clutch wears a lot, and the positioning accuracy is low

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