阅读说明：本技术 一种带液压锁的液压系统气穴排除装置及方法 (Hydraulic system air cavity removing device with hydraulic lock and method ) 是由 邓振月 张志宽 陈文彬 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种带液压锁的液压系统气穴排除装置及方法,在位于执行元件与液压锁之间的两根液压油管上均设置与液压油管连通的接入装置,将两个接入装置通过气穴排除管连通,气穴排除管的内径小于液压油管的内径,通过气穴排除管建立一条流经液压锁的小流量液压回路,通过该小流量液压回路可以对液压锁缓慢进行充油,将气穴空气通过回油管排入油箱,从而消除液压系统中的气穴。小流量液压回路持续5～10分钟即可排除气穴。本发明的液压系统气穴排除方法可快速处理气穴对液压系统带来的严重影响,减少了工人排查故障的频次,并且该液压系统气穴排除装置可以运用到各种高炉带液压锁的液压系统,应用范围广。(The invention discloses a hydraulic system air pocket removing device with a hydraulic lock and a method thereof.A connecting device communicated with the hydraulic oil pipe is arranged on two hydraulic oil pipes between an execution element and the hydraulic lock, the two connecting devices are communicated through an air pocket removing pipe, the inner diameter of the air pocket removing pipe is smaller than that of the hydraulic oil pipe, a small-flow hydraulic loop flowing through the hydraulic lock is established through the air pocket removing pipe, the hydraulic lock can be slowly filled with oil through the small-flow hydraulic loop, and air in the air pocket is discharged into an oil tank through an oil return pipe, so that the air pocket in the hydraulic system is eliminated. The small-flow hydraulic circuit lasts for 5-10 minutes and then air pockets can be eliminated. The method for eliminating the air pockets of the hydraulic system can quickly process the serious influence of the air pockets on the hydraulic system, reduces the frequency of troubleshooting of workers, can be applied to various hydraulic systems with hydraulic locks of blast furnaces, and has wide application range.)

1. The utility model provides a take hydraulic system air pocket removing device of hydraulic pressure lock which characterized in that: get rid of the pipe including pneumatic cylinder, valve, hydraulic pressure lock, switching-over valve, oil tank and air pocket, wherein:

the hydraulic cylinder, the valve, the hydraulic lock, the reversing valve and the oil tank are sequentially communicated through a hydraulic oil pipe to form a hydraulic loop; two hydraulic oil pipes positioned between the valve and the hydraulic lock are respectively provided with an access device communicated with the hydraulic oil pipes;

the two ends of the air cavity removing pipe are respectively communicated with the two access devices, and the inner diameter of the air cavity removing pipe is smaller than that of the hydraulic oil pipe.

2. A hydraulic system cavitation removal device with hydraulic lock as recited in claim 1, wherein: the access device is a pressure measuring joint with a one-way valve.

3. A hydraulic system cavitation removal device with hydraulic lock as claimed in claim 1 or 2, characterized in that: the inner diameter of the air pocket removing pipe is 1 mm-2.5 mm.

4. A hydraulic system cavitation removal device with hydraulic lock as recited in claim 3, wherein: the inner diameter of the hydraulic oil pipe is 20 mm.

5. A hydraulic system cavitation removal device with hydraulic lock as recited in claim 4, wherein: the oil pressure of the hydraulic system is 10 MPa-15 MPa.

6. A cavitation removal method for a hydraulic system having a hydraulic lock, comprising the steps of:

closing a valve on a hydraulic oil line in the hydraulic system between an actuator and the hydraulic lock;

two hydraulic oil pipes positioned between the valve and the hydraulic lock are respectively provided with an access device communicated with the hydraulic oil pipes, and the two access devices are communicated through an air cavity removing pipe with the inner diameter smaller than that of the hydraulic oil pipes;

and hydraulic oil sequentially flows through the oil inlet side hydraulic control one-way valve of the hydraulic lock, the air pocket discharge pipe and the oil outlet side hydraulic control one-way valve of the hydraulic lock for 5-10 minutes.

7. The cavitation removal method of claim 6, wherein: the access device is a pressure measuring joint with a one-way valve.

8. The cavitation removal method of claim 6 or 7, wherein: the inner diameter of the air pocket removing pipe is 1 mm-2.5 mm.

9. The cavitation removal method of claim 8, wherein: the inner diameter of the hydraulic oil pipe is 20 mm.

10. The cavitation removal method of claim 9, wherein: the oil pressure of the hydraulic system is 10 MPa-15 MPa.

Technical Field

The application belongs to the technical field of hydraulic systems, and particularly relates to a hydraulic system air pocket removing device with a hydraulic lock and a method.

Background

The hydraulic system is widely applied to the fields of blast furnace metallurgy, automobiles, aerospace and the like, and functions of pipeline on-off, loading, unloading, device movement and the like are realized by controlling the action of an actuating element (mainly a hydraulic cylinder) through a hydraulic loop. The actuator is usually required to be kept for a period of time after acting in place, for example, when a hydraulic cylinder is used for loading, the hydraulic cylinder is required to keep the current position stationary after reaching a set load, and at the moment, a hydraulic lock is required to be used.

The hydraulic lock is composed of two interlocked hydraulic control one-way valves, the hydraulic loop can be locked through the hydraulic lock, oil in the loop is prevented from flowing, and the hydraulic cylinder can still keep the position of the hydraulic cylinder still under the condition that certain pressure exists outside.

It has been found in practice that cavitation problems often occur in hydraulic systems with hydraulic locks. In hydraulic systems, when the pressure at a point in the flowing liquid is lower than the air separation pressure, the air originally dissolved in the liquid is liberated, causing the liquid to generate a large number of bubbles, which is cavitation in the hydraulic pressure. Cavitation can cause noise and vibration in hydraulic devices and corrosion of metal surfaces.

In general, a hydraulic system with a hydraulic lock has many hydraulic components, and when cavitation occurs, it is difficult to determine where the cavitation occurs, and even if the occurrence position of the cavitation is determined, there is no effective means for eliminating the cavitation at present. The cavitation problem becomes a difficult problem to be solved urgently in a hydraulic system with a hydraulic lock.

Disclosure of Invention

In order to solve the technical problems, the invention provides a device and a method for removing cavitation of a hydraulic system with a hydraulic lock, which can safely and quickly treat the cavitation of the hydraulic system.

The technical scheme adopted for realizing the purpose of the invention is that the air cavity removing device with the hydraulic lock for the hydraulic system comprises a hydraulic cylinder, a valve, the hydraulic lock, a reversing valve, an oil tank and an air cavity removing pipe, wherein:

the hydraulic cylinder, the valve, the hydraulic lock, the reversing valve and the oil tank are sequentially communicated through a hydraulic oil pipe to form a hydraulic loop; and two hydraulic oil pipes positioned between the valve and the hydraulic lock are respectively provided with an access device communicated with the hydraulic oil pipes;

the two ends of the air cavity removing pipe are respectively communicated with the two access devices, and the inner diameter of the air cavity removing pipe is smaller than that of the hydraulic oil pipe.

Preferably, the access device is a pressure measuring joint with a one-way valve.

Preferably, the inner diameter of the cavitation exclusion pipe is 1mm to 2.5 mm.

Preferably, the inner diameter of the hydraulic oil pipe is 20 mm.

Preferably, the hydraulic system has an oil pressure of 10 to 15 MPa.

Based on the same inventive concept, the invention also provides a cavitation eliminating method of the hydraulic system with the hydraulic lock, which comprises the following steps:

closing a valve on a hydraulic oil line in the hydraulic system between an actuator and the hydraulic lock;

two hydraulic oil pipes positioned between the valve and the hydraulic lock are respectively provided with an access device communicated with the hydraulic oil pipes, and the two access devices are communicated through an air cavity removing pipe with the inner diameter smaller than that of the hydraulic oil pipes;

and hydraulic oil sequentially flows through the oil inlet side hydraulic control one-way valve of the hydraulic lock, the air pocket discharge pipe and the oil outlet side hydraulic control one-way valve of the hydraulic lock for 5-10 minutes.

Further, the access device is a pressure measuring joint with a one-way valve.

Further, the inner diameter of the air pocket removing pipe is 1 mm-2.5 mm.

Further, the inner diameter of the hydraulic oil pipe is 20 mm.

Furthermore, the oil pressure of the hydraulic system is 10 MPa-15 MPa.

According to the technical scheme, the two hydraulic oil pipes between the execution element and the hydraulic lock are respectively provided with the access devices communicated with the hydraulic oil pipes, the two access devices are communicated through the air cavity removing pipe, the inner diameter of the air cavity removing pipe is smaller than that of the hydraulic oil pipes, and the air cavity removing pipe is used for establishing a small-flow hydraulic loop flowing through the hydraulic lock.

It has been found that when cavitation occurs in the hydraulic system, a phenomenon occurs in which the cylinder action slows down, and this phenomenon is not improved after the cylinder has been exhausted for a long time. The pressure of a rod cavity of the oil cylinder is measured to be low on a valve table (a one-way valve, a reversing valve and the like in the system are integrated on the valve table), so that the part of the hydraulic system, which generates air pockets, can be judged to be on the hydraulic valve table, in each hydraulic valve in the hydraulic system, the reversing valve, a pressure relief valve and the like, and hydraulic oil directly returns to the oil tank after circulating, so that no air pockets are generated inside; the hydraulic lock is complex in structure and not connected with an oil tank, and finally, the hydraulic lock is judged to have an air cavity fault of a hydraulic system with the hydraulic lock, and the air cavity exists in the hydraulic lock and cannot be discharged through circulation of hydraulic oil in the hydraulic lock.

This application is got rid of the pipe through the air pocket and is established a little flow hydraulic circuit that flows through the hydraulic pressure lock, can slowly carry out the oil charge (last 5 ~ 10 minutes) to the hydraulic pressure lock through this little flow hydraulic circuit, discharges into the oil tank with the air pocket air through returning oil pipe to eliminate the air pocket among the hydraulic system.

The method for eliminating the cavitation of the hydraulic system is easy to implement, and the process is convenient, quick and safe to operate; and the replacement process has less personnel investment, less carrying tools, simple operation and extremely low implementation cost. The method for eliminating the air pockets of the hydraulic system can quickly process the serious influence of the air pockets on the hydraulic system, reduces the frequency of troubleshooting of workers, can be applied to various hydraulic systems with hydraulic locks of blast furnaces, and has wide application range.

Drawings

FIG. 1 is a hydraulic circuit diagram of a hydraulic system cavitation removal device with a hydraulic lock in an embodiment of the present invention;

FIG. 2 is a hydraulic circuit diagram of a hydraulic system in which a cavitation elimination method is implemented in embodiment 2 of the invention;

description of reference numerals: 1-hydraulic cylinder, 2-hydraulic oil pipe, 3-high pressure ball valve, 4-access device, 5-air pocket removing pipe, 6-one-way throttle valve, 7-hydraulic lock, 8-three-position four-way electromagnetic reversing valve, 9-main control valve, 10-one-way valve, 11-oil tank and 12-pressure gauge.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.