阅读说明：本技术 一种基于闭环控制的闭式液压系统及控制方法 (Closed hydraulic system based on closed-loop control and control method ) 是由 许月平 柴东 于 2020-07-02 设计创作，主要内容包括：本申请公开了一种基于闭环控制的闭式液压系统及控制方法,其中,系统包括：液压油箱、油温传感器、截止阀、电动机、钟形罩及联轴器、闭式电比例泵组、冲洗阀组、行走平衡阀、行走马达、齿轮泵、辅助阀组、液压油散、泄油过滤器、回油过滤器、空气过滤器、压力传感器以及底座；本申请提出的液压系统及控制方法,使得液压系统控制简单,结构回路少,布局空间占比小；安全可靠、整机效率高,使用成本低,使用灵活方便。使用集成阀组,易于检修,减少液压系统布置空间。(The application discloses closed hydraulic system and control method based on closed-loop control, wherein, the system includes: the device comprises a hydraulic oil tank, an oil temperature sensor, a stop valve, an electric motor, a bell-shaped cover, a coupling, a closed electric proportional pump set, a flushing valve group, a walking balance valve, a walking motor, a gear pump, an auxiliary valve group, a hydraulic oil radiator, an oil drainage filter, an oil return filter, an air filter, a pressure sensor and a base; the hydraulic system and the control method have the advantages that the hydraulic system is simple to control, the number of structural loops is small, and the layout space occupation ratio is small; safe and reliable, the complete machine is efficient, and use cost is low, and it is nimble convenient to use. And the integrated valve group is used, so that the maintenance is easy, and the arrangement space of a hydraulic system is reduced.)

1. A closed hydraulic system based on closed-loop control, comprising: the hydraulic control system comprises a hydraulic oil tank (1), an electric motor (4), a closed electric proportional pump set (6), a flushing valve set (7), a hydraulic oil radiator (12) and a hydraulic motor (9), wherein the hydraulic oil tank (1) is communicated with the hydraulic oil radiator (12); the motor (4) is connected with the closed electric proportional pump set (6); an oil outlet of the closed electric proportional pump unit (6) is connected with the flushing valve group (7), and the flushing valve group (7) is connected with the hydraulic oil radiator (12); the closed electric proportional pump set (6) is used for driving the hydraulic motor (9) to operate.

2. The closed-loop-control-based closed hydraulic system according to claim 1, characterized in that: an oil return filter (14) and an air filter (15) are arranged on the hydraulic oil tank (1), and the oil return filter (14) is connected with the hydraulic oil radiator (12) through a pipeline; the motor (4) is placed on a base (17) and is connected with the closed electric proportional pump unit (6) through a bell-shaped cover and a coupling (5).

3. The closed-loop-control-based closed hydraulic system according to claim 2, characterized in that: the closed electric proportional pump set (6) sucks oil from the hydraulic oil tank (1) through a built-in oil supplementing gear pump; and a stop valve (3) is arranged between the closed electric proportional pump set (6) and the hydraulic oil tank (1).

4. The closed-loop-control-based closed hydraulic system according to claim 3, wherein: an oil outlet A, B port of the closed electric proportional pump unit (6) is respectively connected in parallel with a A, B port of the flushing valve group (7) and a A, B port of the walking balance valve (8), wherein the flushing valve group (7) consists of a shuttle valve (18) with low pressure priority, an overflow valve (19) and a damping hole (20), the damping hole (20) is arranged in the shuttle valve (18), and the shuttle valve (18) is connected with the overflow valve (19) and is used for overflowing a small amount of hydraulic oil in a main loop to a bypass loop to enter the hydraulic oil radiator (12); an A, B port of the closed electric proportional pump unit (6) is respectively connected with an oil inlet (21) of the flushing valve group (7), enters the flushing valve group (7) through the damping hole (20), then passes through the overflow valve (19) to an outlet (22), and finally is connected to the hydraulic oil dispersion (12) through the outlet (22).

5. The closed-loop-control-based closed hydraulic system according to claim 4, wherein: an auxiliary valve group (11) is arranged on one side of the hydraulic oil tank (1), and the auxiliary valve group (11) is connected with the closed electric proportional pump group (6) by means of a gear pump (10); the auxiliary valve group (11) is connected with the hydraulic oil radiator (12).

6. The closed-loop-control-based closed hydraulic system according to claim 5, wherein: the oil return of the auxiliary valve group (11) and the oil return of the flushing valve group (7) jointly enter a hydraulic oil radiator (12) for cooling, and finally enter a hydraulic oil tank (1) through an oil return filter (14).

7. The closed-loop-control-based closed hydraulic system according to claim 6, wherein: an oil drainage filter (13) is arranged on the hydraulic oil tank (1); and the oil drainage of the closed electric proportional pump set (6) and the oil drainage of the walking motor (9) enter the hydraulic oil tank (1) through the oil drainage filter (13).

8. The closed-loop-control-based closed hydraulic system according to claim 7, wherein: the oil temperature sensor (2) is arranged on the hydraulic oil tank (1), the oil temperature sensor (2) is connected with a PLC, the PLC is connected with a display screen, the PLC reads the numerical value of the oil temperature sensor (2) in real time, and the oil temperature sensor (2) is connected to an oil suction port of the hydraulic oil tank (1).

9. The closed-loop-control-based closed hydraulic system as claimed in claim 8, wherein: and a pressure sensor (16) is arranged on a high-pressure measuring point of the closed electric proportional pump unit (6), and the pressure sensor (16) is connected with the PLC and used for reading the numerical value of the pressure sensor (16) in real time.

10. A closed hydraulic system control method based on closed-loop control is realized by using the closed hydraulic system based on closed-loop control of any claim 1 to 9, and is characterized in that: the control method comprises the following steps:

step S1: monitoring system pressure through a pressure sensor (16) to obtain a system pressure signal; the system oil temperature is monitored through an oil temperature sensor (2);

step S2: collecting various parameters of the crawler mobile crusher;

step S3: setting parameters when the crawler belt mobile crusher moves according to the walking speed V and the driving force F;

step S4: monitoring the outlet pressure of a main pump in real time, limiting the discharge capacity of the main pump and obtaining power control parameters;

step S5: converting a system pressure signal into an electric signal, transmitting the electric signal to the PLC, converting the electric signal into a pressure value, and converting the pressure value into a torque T1 at the rotating speed through a motor torque formula in power control parameters;

step S6: comparing the torque T1 with a set torque value T2, when T1 < T2, the pump group proportional current value I can be increased until T1 ═ T2, where I can not exceed the maximum current value of the pump group; when T1 is greater than T2, reducing the pump group proportion current value I until T1 is T2;

step S7: according to the proportional current value, the output rotating speed of the walking motor is changed, so that the walking speed is changed.