阅读说明：本技术 一种液压卷扬系统 (Hydraulic hoisting system ) 是由 任建辉 袁宏超 陈忱 王光平 陈垚学 于 2020-08-21 设计创作，主要内容包括：本发明提供了一种液压卷扬系统,包括油箱、负载敏感变量泵组件、电磁比例换向阀、平衡阀、定量泵、第一液控换向阀、液压马达和与油箱连通的系统泄油管路,油箱、负载敏感变量泵组件、电磁比例换向阀和液压马达的高压腔连通,平衡阀与高压腔和电磁比例换向阀均连通；油箱、定量泵和第一液控换向阀连通,第一液控换向阀与高压腔和低压腔均连通；第一液控换向阀与低压腔之间的管路以及第一液控换向阀与高压腔之间的管路均和系统泄油管路连通。本发明的有益效果：能够对液压马达进行排气补油排气,以能够避免液压马达出现瞬间超速进而出现失速的情况,以此避免系统出现零件损坏。(The invention provides a hydraulic hoisting system which comprises an oil tank, a load-sensitive variable pump assembly, an electromagnetic proportional directional valve, a balance valve, a constant delivery pump, a first hydraulic control directional valve, a hydraulic motor and a system oil drainage pipeline communicated with the oil tank, wherein the oil tank, the load-sensitive variable pump assembly, the electromagnetic proportional directional valve and a high-pressure cavity of the hydraulic motor are communicated, and the balance valve is communicated with the high-pressure cavity and the electromagnetic proportional directional valve; the oil tank, the constant delivery pump and the first hydraulic control reversing valve are communicated, and the first hydraulic control reversing valve is communicated with the high-pressure cavity and the low-pressure cavity; and a pipeline between the first hydraulic control reversing valve and the low pressure cavity and a pipeline between the first hydraulic control reversing valve and the high pressure cavity are communicated with a system oil drainage pipeline. The invention has the beneficial effects that: can carry out the exhaust to hydraulic motor and mend oil exhaust to can avoid hydraulic motor to appear speeding and then the condition of stall appears in the twinkling of an eye, with this part damage appears in avoiding the system.)

1. The hydraulic hoisting system is characterized by comprising an oil tank (1), a load sensitive variable pump assembly (2), an electromagnetic proportional directional valve (3), a balance valve (4), a constant delivery pump (5), a first hydraulic control directional valve (6), a hydraulic motor (8) and a system oil drainage pipeline (7) communicated with the oil tank (1), wherein the oil tank (1), the load sensitive variable pump assembly (2), the electromagnetic proportional directional valve (3) and a high-pressure cavity of the hydraulic motor (8) are communicated, and the balance valve (4) is communicated with the high-pressure cavity and the electromagnetic proportional directional valve (3); the oil tank (1), the fixed displacement pump (5) and the first hydraulic control reversing valve (6) are communicated, and the first hydraulic control reversing valve (6) is communicated with the high-pressure cavity and the low-pressure cavity; and a pipeline between the first hydraulic control reversing valve (6) and the low-pressure cavity and a pipeline between the first hydraulic control reversing valve (6) and the high-pressure cavity are communicated with the system oil drainage pipeline (7).

2. The hydraulic hoisting system of claim 1 wherein the electromagnetic proportional directional valve (3) is in communication with the first hydraulic control directional valve (6), and when the first hydraulic control directional valve (6) is in the left position, the electromagnetic proportional directional valve (3), the first hydraulic control directional valve (6) and the low pressure chamber are in communication; when the first hydraulic control reversing valve (6) is located at the right position, the electromagnetic proportional reversing valve (3), the first hydraulic control reversing valve (6) and the low-pressure cavity are communicated, and the electromagnetic proportional reversing valve (3), the first hydraulic control reversing valve (6) and the high-pressure cavity are communicated.

3. The hydraulic hoisting system of claim 2, wherein the first hydraulic control directional control valve (6) comprises a left oil port and a right oil port, and when the first hydraulic control directional control valve (6) is in the left position, the electromagnetic proportional directional control valve (3), the left oil port and the low pressure cavity are communicated; when the first hydraulic control reversing valve (6) is in the right position, the right position oil port, the first hydraulic control reversing valve (6) and the low-pressure cavity are communicated, and the right position oil port, the first hydraulic control reversing valve (6) and the high-pressure cavity are communicated; and a pipeline between the balance valve (4) and the high-pressure cavity, a pipeline between the left oil port and the low-pressure cavity, a pipeline between the right oil port and the low-pressure cavity, and a pipeline between the right oil port and the high-pressure cavity are communicated with the system oil drainage pipeline (7).

4. The hydraulic hoisting system of claim 2, further comprising a shuttle valve (9), wherein the electromagnetic proportional directional valve (3) comprises a first working port and a second working port, the first working port is communicated with the oil inlet of the shuttle valve (9), the balance valve (4) and the high pressure cavity, and the second working port is communicated with the oil inlet of the shuttle valve (9), the control port of the balance valve (4) and the first hydraulic directional valve (6); the oil outlet of the shuttle valve (9) is communicated with the first hydraulic control reversing valve (6), when hydraulic oil flows into the first hydraulic control reversing valve (6) from the oil outlet of the shuttle valve (9), the hydraulic oil enables the first hydraulic control reversing valve (6) to be in the left position, so that the second working port, the first hydraulic control reversing valve (6) and the low-pressure cavity are communicated, and when the hydraulic oil flows into the first hydraulic control reversing valve (6) from the metering pump (5), the hydraulic oil enables the first hydraulic control reversing valve (6) to be in the right position.

5. The hydraulic hoisting system of claim 4, further comprising a first overflow valve (10) and a first choke (11), wherein the oil outlet of the shuttle valve (9) is communicated with the pipeline between the first hydraulic-controlled directional valve (6), the first overflow valve (10) and the system oil drain pipeline (7), and the oil outlet of the shuttle valve (9) is communicated with the pipeline between the first hydraulic-controlled directional valve (6), the first choke (11) and the system oil drain pipeline (7).

6. The hydraulic hoisting system of claim 4 further comprising a pressure compensator (12), the pressure compensator (12) being located on a line between the load sensitive variable displacement pump assembly (2) and the electromagnetic proportional directional valve (3), a line between an oil outlet of the shuttle valve (9) and the first hydraulic directional valve (6) being in communication with the pressure compensator (12).

7. The hydraulic hoisting system of claim 4, further comprising a brake cylinder (13) and a second hydraulic control directional control valve (14), wherein the brake cylinder (13) is used for braking the hydraulic motor (8), and the oil outlet of the shuttle valve (9), the second hydraulic control directional control valve (14) and the brake cylinder (13) are communicated.

8. The hydraulic hoisting system of claim 7, further comprising a manual pump assembly (15) in communication with the oil tank (1), wherein the manual pump assembly (15) is in communication with the first hydraulically controlled directional control valve (6), and when hydraulic oil flows from the manual pump assembly (15) to the first hydraulically controlled directional control valve (6), the hydraulic oil causes the first hydraulically controlled directional control valve (6) to be in a right position, so that hydraulic oil of the manual pump assembly (15) flows to the high pressure chamber and the low pressure chamber through the first hydraulically controlled directional control valve (6).

9. The hydraulic hoisting system of claim 8 further comprising a throttle valve (16) and an on-off valve (17), the low pressure chamber, the throttle valve (16), the on-off valve (17) and the high pressure chamber being in communication, the manual pump assembly (15) being in communication with the brake cylinder (13).

10. The hydraulic hoisting system according to any one of claims 1 to 9, further comprising a second overflow valve (18) and a solenoid directional valve (19) communicated with the second overflow valve (18), wherein the second overflow valve (18) is communicated with the fixed displacement pump (5), the second overflow valve (18) is communicated with a system oil return line (20), and the solenoid directional valve (19) is communicated with the system oil return line (7).