CN115638148A

CN115638148A - Electrohydraulic actuator with manual operation

Info

Publication number: CN115638148A
Application number: CN202210915629.3A
Authority: CN
Inventors: 刘宝军; 郑学明; 刘观华; 于洋; 王冶
Original assignee: Shenyang Northeast Electric Power Control Co ltd
Current assignee: Shenyang Northeast Electric Power Control Co ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2023-01-24

Abstract

The invention provides an electro-hydraulic actuator with manual operation, which aims to solve the problems that: how the manual mechanism uses the hydraulic circuit inherent to the electro-hydraulic actuator is no longer provided with a manual mechanism hydraulic circuit. The key points are as follows: the driving shaft is positioned at the front end of the rotor, the tail part of the rotor is provided with a motor input shaft which extends backwards and extends out of a motor shell, and an output shaft of a hand wheel is matched with the motor input shaft in a torque transmission mode. The expected effect is: the volume is obviously reduced; the number of components is obviously reduced, and the reliability of the invention is improved.

Description

Electrohydraulic actuator with manual operation

Technical Field

The invention relates to an electro-hydraulic actuator.

Background

Fig. 1 is a schematic diagram of an application of a conventional manual mechanism in an electro-hydraulic actuator, which is implemented in a manner that a manual pump 1 is matched with a manual reversing valve 2, and a hydraulic circuit of the manual mechanism needs to be designed separately. A hydraulic loop of the manual mechanism and a hydraulic loop of an electro-hydraulic actuator (inherent) are two loops, and the electro-hydraulic actuator is characterized in that a motor 4 drives a hydraulic pump 6 to pump hydraulic oil into an oil cylinder 7 through the hydraulic loop and drive a piston of the oil cylinder 7 to move in a reciprocating mode. The hydraulic circuit of the manual mechanism comprises at least two hydraulic oil pipes 3 and a manual pump rocker 5 besides a manual pump 1 and a manual reversing valve 2. When the manual pump is used, the manual pump rocker 5 is inserted into a connecting sleeve of the manual pump 1, the manual pump rocker 5 is rocked to drive the manual pump 1 to absorb and discharge oil, and the manual pump 1 presses hydraulic oil into a cavity of the oil cylinder 7 through the hydraulic pipeline 3 to enable the oil cylinder 7 to act; when the manual reversing valve 2 reverses, hydraulic oil is pressed into the other cavity of the oil cylinder 7 to enable the oil cylinder 7 to move reversely, and therefore the reciprocating motion of the oil cylinder 7 driven by the manual mechanism can be achieved. The manual pump 1, the manual reversing valve 2 and the hydraulic oil pipe 3 need to occupy a part of physical space independently; the manual pump rocker 5 also has a certain operating space when in use, and the situation that the manual pump rocker does not interfere with surrounding adjacent equipment needs to be considered. Such an electrohydraulic actuator conventionally equipped with a manual mechanism is therefore generally considerably more bulky than an electrohydraulic actuator without a manual mechanism. The hydraulic circuit of the separately arranged manual mechanism comprises a hydraulic joint surface and a pipe joint 8 for connecting pipelines, and the positions have the risk of hydraulic oil leakage. The manual pump 1 and the manual reversing valve 2 are basic hydraulic components, and failure is possible, such as oil leakage, jamming and the like. When these hydraulic components fail, this can lead to an overall failure of the manual mechanism. When the manual mechanism is not used, the manual pump rocker 5 is generally separated from the manual pump 1 and is easy to lose; the manual mechanism is disabled once the manual pump rocker 5 is lost.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide an electro-hydraulic actuator with manual operation, which does not have a hydraulic circuit with a manual mechanism.

The purpose of the invention is realized as follows: the hand wheel type electric motor comprises a servo motor or a stepping motor, a rotor of the servo motor or the stepping motor, and a driving shaft, wherein the driving shaft is positioned at the front end of the rotor. Forward and backward as used herein means that the drive shaft is forward, the rotor is centered, and the hand wheel is rearward.

When the electro-hydraulic actuator needs to work by a manual mechanism, a hand wheel is manually shaken, a hand wheel output shaft sequentially drives a motor input shaft, a rotor and a motor drive shaft to rotate (output torque), an electric hydraulic pump is driven to work, hydraulic oil enters a hydraulic loop of the electro-hydraulic actuator, and the electro-hydraulic actuator enters a working state.

Compared with the prior art (refer to fig. 1), the positive effects of the invention are as follows: the manual mechanism uses the inherent hydraulic circuit of the electro-hydraulic actuator, namely, the hydraulic circuit of the manual mechanism is not additionally arranged, so that the volume of the hydraulic actuator is obviously reduced; and secondly, the number of components is obviously reduced, the reliability of the invention is improved, and the cost of the product of the invention is reduced.

Drawings

The invention is further described below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of an application of a prior manual mechanism in an electro-hydraulic actuator.

Fig. 2 is a schematic diagram of the present invention.

Fig. 3 is a cross-sectional view of the hand wheel, servo motor or stepper motor, hydraulic pump of fig. 2, with the motor input shaft and the hand wheel output shaft disengaged.

Fig. 4 is a schematic view of the motor input shaft and the hand wheel output shaft of fig. 3 in a closed state.

Fig. 5 is a perspective view of the rear portion of the servo motor or stepper motor of fig. 3.

Detailed Description

Referring to fig. 2-4, it includes servo motor or step motor 200 and its rotor 202, the drive shaft 201 locates at the front end of the rotor 202, drive the hydraulic pump 300, there is motor input shaft 204 extending backwards and stretching out of the motor casing 203 at the afterbody of the rotor, the hand wheel 100 is made up of output shaft 105, hand wheel disc 104, wheel arm 103, hand grip 102 and hand wheel axle 101, the output shaft 105 of the hand wheel cooperates with input shaft 204 of the motor with the way of transmitting torque, that means, the front end of the output shaft 105 of the hand wheel has a straight key slot 106, the back end of the input shaft of the motor presents a straight key 205 cooperating with a straight key slot, the output shaft of the hand wheel is installed on nut type bearing bracket 10, the said nut type bearing bracket means that the anterior nut 11 and posterior bearing bracket 12 form an organic whole. Referring to fig. 5, the end of the housing 203 of the servo motor or the stepping motor is provided with an external screw interface 205, which is matched with the nut 11 of the nut type bearing seat. A spring 20 is arranged between the tail part of the shell 203 and the front end face of the hand wheel output shaft, the elasticity of the spring is limited in that the key groove 106 and the key shaft 205 are in a disengaged state when no external force exists, namely the manual mechanism does not work, and at the moment, the servo motor or the stepping motor 200 works normally. When the servo motor or the stepping motor 200 does not work and the manual mechanism needs to work, when the handle 102 of the handwheel 100 is held by manpower to apply forward axial thrust, the output shaft 105 overcomes the elasticity of the spring 20 to move towards the servo motor or the stepping motor 200, so that the key shaft 205 enters the key slot 106 and is meshed with the key slot 106, then the handwheel is shaken, the handwheel output shaft sequentially drives the motor input shaft, the rotor and the motor driving shaft to rotate (output torque), the hydraulic pump 300 is driven to work, hydraulic oil enters a hydraulic loop of the electro-hydraulic actuator, and the electro-hydraulic actuator enters a working state.

Claims

1. The electro-hydraulic actuator with manual operation comprises a servo motor or a stepping motor, a motor shell of the servo motor or the stepping motor, a rotor and a driving shaft, wherein the driving shaft is positioned at the front end of the rotor.

2. The electro-hydraulic actuator with manual operation of claim 1, wherein: the output shaft of the hand wheel is matched with the motor input shaft in a torque transmission mode, namely, a linear key groove is formed in the front end face of the output shaft of the hand wheel, and a linear key matched with the linear key groove is formed in the rear end face of the motor input shaft.

3. The electro-hydraulic actuator with manual operation of claim 2, wherein: the hand wheel output shaft is arranged on a nut type bearing seat, and the nut type bearing seat is formed by a nut at the front part and a bearing seat at the rear part into a whole; the tail part of the shell of the servo motor or the stepping motor is provided with an external thread interface which is matched with a nut 11 of the nut type bearing seat; a spring is arranged between the tail part of the shell and the front end face of the hand wheel output shaft, and the elasticity of the spring is limited in that the key groove and the key are in a disengaged state when no external force exists; when the hand wheel is manually held and forward axial thrust is applied to the handle, the output shaft overcomes the elastic force of the spring to move towards the servo motor or the stepping motor, so that the key enters the key groove and is meshed with the key groove and the stepping motor.