Synchronous cylinder controls tundish lifting device

Abstract

The invention discloses a synchronous cylinder control middle tank ascending and descending device, which comprises a plurality of ascending and descending executing mechanisms and a hydraulic control system, wherein each ascending and descending executing mechanism comprises a hydraulic executing cylinder controlling an ascending and descending beam to ascend and descend, and the hydraulic control system comprises a synchronous hydraulic cylinder, a dual-electric-control electromagnetic reversing valve, a first single-electric-control electromagnetic reversing valve, a first hydraulic control one-way valve, a second hydraulic control one-way valve, a second single-electric-control electromagnetic reversing valve, a third single-electric-control electromagnetic reversing valve, an oil inlet hole (P) and an oil return hole (T). The synchronous cylinder control middle tank ascending and descending device has the advantages that the volume efficiency of the synchronous hydraulic cylinder per se is high, higher synchronization precision is obtained under the condition of different loads, the function cannot be achieved by other hydraulic elements such as synchronous motors, the hydraulic control system can ensure the synchronous control precision, each hydraulic executing cylinder does not need to be provided with a displacement sensor, the asynchronism and the instability of system executing mechanisms due to the fault of the displacement sensors, a hydraulic control loop and an electric control loop are avoided, and the system reliability is improved.

Description

technical field [0001] The invention relates to a tundish lifting device controlled by a synchronous cylinder, which belongs to the technical field of hydraulic control of continuous casting machine equipment in the metallurgical industry. Background technique [0002] The tundish is a transition vessel between the ladle and the crystallizer in the continuous casting process. The lifting of the tundish is to meet the needs of baking of the tundish, loading and unloading of the long nozzle, and pouring of the submerged nozzle device into the mold. Unsynchronized lifting of tundish will seriously affect production. [0003] There are two types of tundish lifting for continuous casting equipment tundish trucks, one is electric control, but the worm gear and worm used in the electric control is a jack type, the structure is complex, the working procedure is cumbersome, and the worm gear and worm are directly affected by the pouring environment. The lead screw is easy to damage ...

AI Technical Summary

Problems solved by technology

Unsynchronized lifting of tundish will seriously affect production

[0003] There are two types of tundish lifting for continuous casting equipment tundish trucks, one is electric control, but the worm gear and worm used in the electric control is a jack type, the structure is complex, the working procedure is cumbersome, and the worm gear and worm are directly affected by the pouring environment. The lead screw is easy to damage and the maintenance cost is high; the other is hydraulic control. In the prior art, the hydraulic synchronous control lifting method has complicated system principles, cumbersome control, and high failure rate. The hydraulic control tundish lifting synchronization mainly depends on hydraulic synchronization. motor

The synchronization accuracy of hydraulic synchronous motors is mainly affected by the following factors: machining accuracy of hydraulic synchronous motors and hydraulic actuators, uniformity of load, temperature and viscosity of medium, system pressure level, speed of synchronous motors, layout of hydraulic pipelines, etc. , these will lead to asynchronous actions of the actuators and affect the reliability of the system

In order to improve the control accuracy of the hydraulic synchronous motor, a linear displacement sensor is installed in the hydraulic actuator cylinder for synchronous detection, and the position synchronization compensation control is performed by obtaining the signal of the displacement sensor. However, the hydraulic and electrical control circuits of this system are relatively complicated, which is not conducive to System installation, maintenance and commissioning, use

Images