Electric push rod with hand-rotating release device

Abstract

The invention discloses an electric push rod with a hand-rotating release device, and belongs to the technical field of linear transmission. The electric push rod comprises a shell, a driving motor, atransmission assembly, a rotating screw rod and a transmission nut, and further comprises a clutch device, a self-locking device and the hand-rotating release device, wherein the clutch device is used for connecting or disconnecting power transmission between the transmission assembly and the rotating screw rod; the self-locking device generates frictional resistance on the rotating lead screw when the rotating lead screw rotates reversely; and the hand-rotating release device comprises a release rotary knob, a first driving component is connected with the clutch device, a second driving component is used for being connected with the self-locking device, the release rotary knob is in an initial state and a complete release state through rotating motion, and in the process from the initialstate to the complete release state, the first driving component drives the clutch device to break power connection, and the second driving component drives a release torsion spring to be released. The electric push rod has the advantages that the hand-rotating release device can control two devices, and thus the operation is smoother and more convenient.

Description

【Technical field】 [0001] The invention relates to an electric push rod with a hand-rotating release device, belonging to the technical field of linear transmission. 【Background technique】 [0002] Electric push rod, also known as linear actuator, is widely used in furniture, medical equipment, solar power generation and other fields. Its main structure includes drive motor, transmission worm, worm wheel, screw, nut. The working principle is that the drive motor drives the transmission worm to rotate. The transmission worm is engaged with the worm wheel to drive the worm wheel to rotate, the rotation of the worm wheel drives the rotation of the screw, and the rotation of the screw drives the nut to move axially. [0003] Combined with the application environment of the electric push rod, when the electric push rod encounters a failure of the drive motor, or in the event of a power failure or other situations where the power needs to be cut off, a clutch device will be added, ...

AI Technical Summary

Problems solved by technology

[0005] On the current existing electric push rods, usually only a clutch device is provided, or only a self-locking device is provided, even if the clutch device and the self-locking device are provided at the same time, the drive components that drive these two devices are usually separated from each other, that is, When the operator needs to control the clutch device and the self-locking device at the same time, the two devices need to be operated independently, so the operation will appear more complicated

[0006] In addition, the current clutch device or self-locking device, which drives the clutch device or self-locking device, basically relies on the pull wire to pull the pull rod. In this mode of operation, it is difficult to control the pulling force or stroke, which leads to the failure of the clutch device or self-locking device. Not very smooth when running

Of course, there are also release devices similar to hand rotation on the market. For example, the Chinese utility model patent CN201220326831. The installation stroke of the electric push rod is relatively limited, and the installation space of this kind of electric push rod with hand-rotating device will be affected

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