41results about How to "Stable and reliable speed" patented technology

The invention discloses an indoor high-voltage grounding switch capable of warning in place. The indoor high-voltage grounding switch comprises a base, static contacts, movable contacts, insulators, rotation shafts and half-I-shaped sliding rail supports, wherein the rotation shafts are connected to the base, the half-I-shaped sliding rail supports are fixedly sleeved on the rotation shafts, a lower gear sliding rail is formed in each boss part and faces a direction of each insulator, the bottom of each movable contact is connected with the half-I-shaped sliding rail support by an upper gear sliding block and moves upwards and downwards, a gear sliding strip structure is arranged at a position, corresponding to the upper gear sliding block, in the half-I-shaped sliding rail support, a front end of the upper gear sliding block is connected with a lower sliding block through a pull rod and moves forwards and backwards in the lower gear sliding rail, a point contact type in-place switch is also arranged at a position of a top part of the movable contact, a top part of the point contact type in-place switch is connected with an indication lamp, and the indication lamp is connected with a position of a top part of the static contact. The indoor high-voltage grounding switch stably moves upwards and downwards within a travelling range, and has relatively good stability and reliability.

Provided are a lifting hydraulic control system and method and a boarding bridge. The lifting hydraulic control system comprises a first lifting oil cylinder system having a first position detecting function, a circuit having a load maintaining function and a circuit having a reversing function. The first lifting oil cylinder system having the first position detecting function comprises a liftingoil cylinder, a detecting seat valve with a valve element, a spherical magnetic valve and a control oil way. The spherical magnetic valve and the detecting seat valve with the valve element jointly form a hydraulic circuit through the control oil way. The circuit having the load maintaining function is communicated with the first lifting oil cylinder system having the first position detecting function, and a balance valve is arranged on the circuit having the load maintaining function. The circuit having the reversing function is communicated with the circuit having the load maintaining function, a three-position four-way directional valve is arranged on the circuit having the reversing function, the circuit having the reversing function is provided with a first reversing oil port, a second reversing oil port and a third reversing oil port, the first reversing oil port is used for connection with an external hydraulic power source, the second reversing oil port is used for connection with an oil tank, and the third reversing oil port is communicated with the circuit having the load maintaining function.

A rocket launching vehicle erecting hydraulic system and adjustment method with a negative load adjustment function, the purpose of which is to safely, quickly and conveniently realize the manual adjustment and withdrawal of the negative load of the hydraulic system under the condition of no power, and limit the withdrawal speed; The hydraulic system includes: a lifting system, a slow-down speed regulating system; the slow-down speed regulating system is installed on the lifting system in parallel through pipelines and pipe heads; the lifting system includes: a fuel tank assembly, a motor oil pump group, a one-way valve, reversing valve, hydraulic retaining element, and actuator; the fuel tank assembly, motor oil pump unit, and actuator form a hydraulic circuit through the pipeline and pipe head; the one-way valve, reversing valve, and hydraulic retaining element are arranged in sequence Between the motor oil pump group and the actuator; the slow down speed regulation system includes: hydraulic branch circuit, stop valve, speed control valve; the hydraulic branch circuit is arranged in parallel on the liquid return pipeline in the hydraulic circuit of the lifting system; the The cut-off valve and the speed regulating valve are sequentially arranged on the hydraulic branch along the liquid return direction.