Pressurizing cylinder capable of changing pressurizing ratio exponentially and control method

Abstract

The invention discloses a pressurizing cylinder capable of changing the pressurizing ratio exponentially and a control method. The pressurizing cylinder comprises a primary hydraulic cylinder body, the primary hydraulic cylinder body is internally and fixedly provided with a fixed plunger, a plunger cylinder is arranged between the fixed plunger and the primary hydraulic cylinder body, the end portion of the plunger cylinder stretches into a secondary hydraulic cylinder body, the fixed plunger is internally provided with a first oil path passage and a second oil path passage, a first oil cavity is formed between the plunger cylinder, the fixed plunger and the primary hydraulic cylinder body, a second oil cavity and a third oil cavity are formed between the fixed plunger and the plunger cylinder, a fourth oil cavity is formed between the primary hydraulic cylinder body and the plunger cylinder, a fifth oil cavity is formed between the secondary hydraulic cylinder body and the plunger cylinder, the first oil path passage is connected with the second oil cavity, the second oil path passage is connected with the third oil cavity, and the other oil cavities are all provided with oil path inlets. By means of the pressurizing cylinder capable of changing the pressurizing ratio exponentially and the control method, the pressurizing cylinder is made to have seven pressurizing ratio, andpressure can be changed by one to seven times the basic pressurizing ratio, when the primary pressure remains unchanged, seven secondary pressures can be output, and the pressurizing cylinder capableof changing the pressurizing ratio exponentially and the control method have high adaptability.

Description

technical field [0001] The invention belongs to the field of hydraulic transmission and control, in particular to a booster cylinder capable of multiplying the booster ratio and a control method. Background technique [0002] When a branch in the hydraulic system needs pressure oil with high pressure but low flow rate, it is uneconomical to use a high-pressure pump, or when there is no such high-pressure hydraulic pump at all, a booster circuit can be used; or in energy In recovery, the hydraulic system recovers hydraulic oil with relatively low pressure. This low-pressure oil cannot be directly used to drive the actuators in the hydraulic system. It must use a booster circuit to raise the pressure to the required pressure before it can be used. The main component used in the booster circuit is the booster cylinder. The principle is: when the supplied low-pressure oil enters the large piston chamber of the booster cylinder, the pressure oil generates thrust on the large pist...

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Problems solved by technology

However, the boost ratios of these two booster cylinders are fixed, so the application is relatively simple.

[0004] In the booster circuit of the above-mentioned booster cylinder, if the primary pressure increases, the secondary pressure also increases year-on-year after boosting, but the secondary pressure required by the system is relatively low compared to the secondary pressure after boosting. It can only be used after flow or decompression, which will cause energy loss, heat the system, and reduce efficiency; or the required secondary pressure has increased, but the primary pressure has not changed, and the secondary pressure oil after boosting cannot meet the requirements of the system. Requirements for secondary pressure

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