Fault-tolerant reversing valve

Abstract

The invention discloses a fault-tolerant reversing valve. The fault-tolerant reversing valve comprises a main body valve, a circumferential driving mechanism and an axial driving mechanism, wherein one end of the main body valve is connected with the circumferential driving mechanism, and the other end of the main body valve is connected with the axial driving mechanism. The main body valve is provided with a first valve core and a second valve core, one end of the first valve core is connected with a first servo motor through a first gear, the other end of the first valve core abuts against afirst linear sliding block, and the first linear sliding block is connected with a first rack; one end of the second valve core is connected with a hand wheel through a second gear, the other end ofthe second valve core abuts against a second linear sliding block, and the second sliding block is connected with a second rack; the first gear and the second gear are engaged with a fourth gear, thefirst rack and the second rack are engaged with a third gear, and a second servo motor is connected to the third gear. According to the fault-tolerant reversing valve, the main body valve and the valve cores are directly matched, a valve sleeve structure is omitted, and oil reversing can be continued through other driving parts after a main driving motor is damaged.

Description

technical field [0001] The invention belongs to the field of reversing valves, in particular to a fault-tolerant reversing valve. Background technique [0002] The fault-tolerant control of electro-hydraulic commutation technology refers to controlling the hydraulic actuators to continue to complete the commutation function by relying on the driving components that can still work normally after some driving components fail. Among them, the reversing valve is the core component of the electro-hydraulic reversing technology, and its performance and fault-tolerant control function directly determine the working performance and fault-tolerant performance of the electro-hydraulic reversing technology. [0003] So far, there is no electro-hydraulic directional valve with fault-tolerant function, that is, after the drive part fails, the electro-hydraulic directional valve cannot continue to work. In the absence of fault-tolerant function, for some large-scale equipment that is inc...

AI Technical Summary

Problems solved by technology

[0005] 1. The existing electro-hydraulic reversing technology does not have fault-tolerant characteristics. For the servo valve, when the driving part that drives the axial movement of the valve core fails, it cannot continue to work; for the existing rotary valve, when the driving part that controls the rotation of the valve core After some failures, they cannot continue to work, so they cannot meet the requirements of some electro-hydraulic commutation systems that are inconvenient to replace driving components.

[0006] 2. The existing rotary valve reversing technology generally adopts the matching design of the valve core and valve sleeve, the structure is relatively complicated, and the manufacturing requirements are high, thus limiting its wide application

[0007] 3. The existing rotary valve reversing technology cannot effectively realize the detection of the valve core position

In the absence of a spool position detection method, on the one hand, it is impossible to determine the zero position of the spool; on the other hand, in practical applications, it cannot meet certain occasions that require precise control of the reversing position.

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