Electro-hydraulic direct-drive servo closed differential control driving system for stepping lifting mechanism

Abstract

The invention belongs to the technical field of hydraulic energy saving, and relates to an electro-hydraulic direct-drive servo closed differential control driving system for a stepping lifting mechanism. The system involves a double-rotation-direction hydraulic pump, a differential hydraulic cylinder, a double-rotation-direction servo motor and an energy accumulator set, wherein the double-rotation-direction hydraulic pump is provided with two pressure oil opening ends, and the which double-rotation-direction hydraulic pump is connected with the energy accumulator set and the differential hydraulic cylinder correspondingly; and the double-rotation-direction servo motor is used for controlling the output flow and direction of the double-rotation-direction hydraulic pump. According to the electro-hydraulic direct-drive servo closed differential control driving system for the stepping lifting mechanism, an electro-hydraulic direct-drive servo technology is combined with the energy accumulator set and an electric energy storage device to control the lifting motion of the differential hydraulic cylinder, and a differential hydraulic cylinder control method is adopted, so that the transmission control principle is simplified, the service life of the hydraulic cylinder is prolonged, the motion characteristic of the driving system is improved, and valve control throttling loss is avoided; and meanwhile, gravitational potential energy and servo motor braking energy are recycled, and compared with a traditional energy-saving technology, the energy-saving efficiency is higher, the system is simpler, the reliability is higher, the investment is more saved, and the operation and maintenance cost is lower.

Description

technical field [0001] The invention belongs to the technical field of hydraulic energy saving, and relates to an electro-hydraulic direct-drive servo closed-type differential control drive system of a step-lift mechanism. Background technique [0002] Stepping lifting mechanisms are widely used in various industries. Some stepping lifting mechanisms in heavy-duty working conditions are usually driven by hydraulic pressure, such as walking heating furnaces, walking beam conveyors, and walking cooling beds. At present, this type of stepping lifting mechanism uses hydraulic station oil supply in the ascending stage, and controls the ascending speed through throttling and speed regulation of the hydraulic valve. There is a throttling loss in the ascending stage, which increases the energy consumption in the ascending stage; It is driven by its own weight or with auxiliary back pressure, and the descending speed is controlled by throttling the hydraulic valve, resulting in a lar...

AI Technical Summary

Problems solved by technology

At present, this type of stepping lifting mechanism uses hydraulic station oil supply in the ascending stage, and controls the ascending speed through throttling and speed regulation of the hydraulic valve. There is a throttling loss in the ascending stage, which increases the energy consumption in the ascending stage; Driven by self-weight or auxiliary back pressure, the descending speed is controlled by hydraulic valve throttling, resulting in a large amount of throttling and heat generation, resulting in a great waste of energy

[0003] There are also some stepping lifting mechanisms that use traditional energy-saving technology, which are mainly divided into two categories. The first category is to increase the balance hydraulic cylinder alone to balance the load gravity, thereby reducing the driving force of the hydraulic cylinder. This method needs to change the structure of the walking beam, and at the same time Increased system complexity; the second type uses a three-chamber hydraulic cylinder to replace the original lifting hydraulic cylinder, and balances the load gravity through the third control chamber of the three-chamber hydraulic cylinder to achieve energy-saving effects. This method has a complicated structure for the three-chamber hydraulic cylinder , high failure rate

These traditional energy-saving technologies still have the disadvantages of large throttling energy loss and efficiency loss, complex system, large maintenance, and high failure rate.

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