Electric push rod

Abstract

The invention discloses an electric push rod that comprises a box body and a power part. The power part is fixed to the box body and is provided with a power line. The output end of the power part isprovided with a worm gear pair. A helical gear is disposed in the box body and fixed in the box body by a pin. The helical gear and the pin are loosely arranged in order that the helical gear rotatesfreely in the box body. A lead screw is arranged in the box body, and is sleeves the box body through a nut. A hole is arranged at the end of the lead screw and a cylindrical pin passes through the hole. The lead screw and the cylindrical pin are embedded in the groove of the helical gear so as to be in line contact to transfer torque. The outer side of the lead screw is provided with a middle cover. The center position of the middle cover is equipped with a bearing. The tail end of the lead screw is fixedly connected to the bearing. The electric push rod has the advantages of large self-locking force, automatic centering, high processing precision, high reliability, good sealing performance, low noise, low cost is reduced and good economic benefit.

Description

technical field [0001] The invention relates to a mechanical device capable of reciprocating push and pull, in particular to an electric push rod. Background technique [0002] The electric push rod is a general-purpose auxiliary drive device, which can be widely used in industries such as electric power, machinery, metallurgy, transportation, mining, petroleum, chemical industry, heavy lifting, transportation, construction, grain and feed processing, etc. The electric drive device converted into linear reciprocating motion of the push rod can be used as an execution mechanism in various simple or complex technological processes to realize remote control, centralized control or automatic control. [0003] However, there are many deficiencies in the electric push rods in the prior art: the push rods are generally installed with a fixed shaft hole, and when the assembly holes of the whole machine are not parallel, excess lateral force will be generated, resulting in the electr...

AI Technical Summary

Problems solved by technology

[0003] However, there are many deficiencies in the electric push rods in the prior art: the push rods are generally installed with a fixed shaft hole, and when the assembly holes of the whole machine are not parallel, excess lateral force will be generated, resulting in the electric current change of the push rod. Large or even the push rod is stuck; some push rods provide a cantilever beam structure device for electric push rods, the disadvantage is that the screw and the helical gear are coaxial, and the worm and the helical gear are subject to lateral force when meshing, which may cause the wire The center is shifted during the rod movement; the self-locking of the electric push rod needs to be additionally equipped with a self-locking spring, which is costly and bulky, and some methods are implemented by increasing the friction between parts, but the mechanism efficiency will inevitably decrease , the result of frictional heat generation may cause the locking of transmission parts; the method of adding line cards for external wiring will inevitably increase the cost and the process will be cumbersome, and the sealing needs to be installed with an additional shell, which is costly and bulky, and cannot guarantee good sealing.

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