A closed circulation system for flushing hydraulic drive main pipeline

Abstract

The present invention discloses a closed circulation system for flushing a hydraulic drive main line, including a hydraulic drive main line and a filter assembly, wherein the oil outlet of the hydraulic drive main line is connected to the filter assembly through the flushing main line, and the other end of the filter assembly is connected to the oil inlet of the hydraulic drive main line, and the hydraulic drive main line and the filter assembly form a closed circulation structure, wherein the number of the hydraulic drive main lines is one or more. The power speed and the closed pump displacement output can be adjusted according to the pipeline conditions, and the flushing flow rate can be more accurately controlled to achieve the best flushing effect, and it is convenient for periodic cleaning, thereby improving the economy and practicality. The present invention designs a closed oil circulation flushing hydraulic main line system, which can ensure the flushing flow rate and system cleanliness, can solve the problem of being unable to accurately control the output flow rate, wasting energy and poor economy, and can realize convenient and quick periodic flushing with basically no leakage.

Description

Technical Field

[0001] The invention relates to the field of hydraulic pipeline flushing, and in particular to a closed circulation system for flushing a hydraulic drive main pipeline. Background Art

[0002] Since the components of the hydraulic system are of high precision, system contamination can easily lead to a high failure rate, and if particles with high hardness are mixed into the system, the service life of the components will be drastically shortened, causing unnecessary economic losses, so pipeline cleaning is a necessary step. Pipeline cleaning can remove welding slag on the inner wall of the steel pipe, particles in the component manufacturing process, and impurities in the joint and hose processing process, thereby achieving the cleanliness of the hydraulic oil during the normal operation of the hydraulic system.

[0003] Generally, hydraulic pipelines are cleaned by pickling and then directly put back into the system. Very few special equipment will use a circulating cleaning system. Hydraulic circulating cleaning requires that the flow state of the flushing liquid reaches turbulence. The degree of turbulence determines the flushing effect. The traditional flushing method is to use an external pump station for flushing. The main hydraulic pipeline is short-circuited on the external pump station, and the remaining hydraulic components are disconnected to form a pump station-pipeline-pump station system. The pump station requires a large volume and a large flow rate. The pumps in the pump station often use large-displacement quantitative pumps, which cannot accurately control the output flow rate. When the flow rate needs to be controlled, throttle valves and relief valves are usually used, which not only wastes energy, but also the pump station is expensive. It is also necessary to consider the procurement and production cycle, and the economy is poor. In addition, when the hydraulic system needs secondary flushing or periodic flushing after running for a period of time, the system leaks oil severely and is difficult to clean, making the operation difficult and causing time and work delays. Summary of the invention

[0004] The purpose of the present invention is to provide a closed circulation system for flushing hydraulic drive main pipeline, which solves the problems of being unable to accurately control the output flow, being unable to ensure the flushing flow and system cleanliness, wasting energy and having poor economy, being difficult in periodic flushing operation, and having serious oil leakage in the system.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention discloses a closed circulation system for flushing a hydraulic drive main line, comprising a hydraulic drive main line and a filter assembly, wherein the oil outlet of the hydraulic drive main line is connected to the filter assembly via the flushing main line, and the other end of the filter assembly is connected to the oil inlet of the hydraulic drive main line. The hydraulic drive main line and the filter assembly form a closed circulation structure, and the number of the hydraulic drive main lines is one or more.

[0007] Furthermore, the filter assembly includes a main pipe, a joint, a flange, a ball valve, and a filter. The two ends of the filter are connected to the ball valves to form a filter unit. The two ends of the filter unit are connected to the inner sides of two parallel main pipes. One end of the two main pipes is a blind hole, and the other end is sealed by a flange. Multiple joints are arranged on the outside of the two main pipes. The joint on one side serves as an oil inlet, and the joint on the other side serves as an oil outlet. There are multiple filter units.

[0008] Furthermore, the plurality of connectors are arranged at equal intervals, and the specifications of the connectors are set to be multiple, and connectors of different specifications are suitable for connecting pipes of different diameters.

[0009] Furthermore, two quick connectors are provided at both ends of the flushing main line, one of the quick connectors is connected to the oil outlet of the hydraulic drive main line, and the other quick connector is connected to the oil inlet of the connection filter assembly; a back pressure check valve is provided on the oil outlet pipeline of the filter assembly, and the back pressure check valve is connected to the oil inlet of the hydraulic drive main line through a quick connector.

[0010] Furthermore, the two main pipes are respectively connected with a pressure detection device, and the pressure detection device uses a first seismic-resistant pressure gauge or pressure sensor with a measuring range of 0-60bar; a pressure detection device is connected to the oil inlet pipeline of the hydraulic drive main pipe, and the pressure detection device uses a second seismic-resistant pressure gauge or pressure sensor with a measuring range of 0-600bar.

[0011] Furthermore, the diameter and length of the main flushing line correspond to the connected hydraulic drive line.

[0012] Furthermore, the number of filter units in use is controlled by opening and closing the ball valve, and the number of filter units opened is adjusted according to the hydraulic drive main line to be cleaned.

[0013] Furthermore, the hydraulic drive main line adopts a closed pump, and the closed pump is an electric proportional control variable pump. The oil suction port and leakage port of the hydraulic drive main line are connected to the oil tank.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are:

[0015] The present invention discloses a closed circulation system for flushing a hydraulically driven main line, comprising a hydraulically driven main line part and a filter assembly part. The closed flushing system of the main line-filter-main line is formed by the hydraulically driven main line with a closed pump and the filter assembly. The closed pump system of the original equipment is used, and no external pump station is required, so flushing is more convenient, the operation difficulty is small, the construction is convenient, and the economy is high. Different hydraulic pipelines use different flushing flow rates, and the power speed and the closed pump displacement output can be adjusted according to the pipeline conditions. The appropriate main line size can be selected to more accurately control the flushing flow rate, thereby achieving the best flushing effect, facilitating periodic cleaning, and improving economy and practicality. The present invention designs a closed oil circulation system for flushing the hydraulic main line, which can ensure the flushing flow rate and system cleanliness, solve the problems of being unable to accurately control the output flow rate, wasting energy and poor economy, and can realize convenient and quick periodic flushing with basically no leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 A top view of the filter assembly structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the filter assembly structure of the present invention;

[0019] Figure 3 It is a schematic diagram of a closed circulation system for flushing a hydraulic drive main line of the present invention;

[0020] Figure 4 This is a diagram showing an embodiment of a closed circulation system for flushing a hydraulic drive main line of the present invention;

[0021] Explanation of the reference numerals in the accompanying drawings: 1. main pipe; 2. connector; 3. flange; 4. ball valve; 5. filter; 6. hydraulic drive main pipe; 7. quick connector; 8. flushing main pipe; 9. first seismic-resistant pressure gauge; 10. filter assembly; 11. back-pressure check valve; 12. hydraulic oil tank; 13. second seismic-resistant pressure gauge. DETAILED DESCRIPTION

[0022] like Figure 1-4 As shown, a closed circulation system for flushing a hydraulic drive main line includes a hydraulic drive main line 6 and a filter assembly 10. The oil outlet of the hydraulic drive main line 6 is connected to the filter assembly 10 through the flushing main line 8. The other end of the filter assembly 10 is connected to the oil inlet of the hydraulic drive main line 6. The hydraulic drive main line 6 and the filter assembly 10 form a closed circulation structure. The number of the hydraulic drive main lines 6 is one or more. By using the closed system of the original hydraulic drive equipment, no external pump station is required, and flushing is more convenient.

[0023] The filter assembly 10 includes a main pipe 1, a joint 2, a flange 3, a ball valve 4, and a filter 5. The two ends of the filter 5 are connected to the ball valve 4 to form a filter unit. The two ends of the filter unit are connected to the inner side of two parallel main pipes 1. One end of the two main pipes 1 is a blind hole, and the other end is sealed by the flange 3. Multiple joints 2 are arranged on the outside of the two main pipes 1. One side joint 2 serves as an oil inlet, and the other side joint 2 serves as an oil outlet. The number of the filter units is multiple. In the design process of the hydraulic drive equipment, the hydraulic filter assembly 10 is directly arranged inside the power compartment. After each hydraulic system cleaning, the filter 5 will replace the used filter 5 with a new filter element to facilitate the next system cleaning.

[0024] The two ends of the flushing main line 8 are connected by a quick connector 7, one end of which is connected to the oil outlet of the hydraulic drive main line 6, and the other end is connected to the oil inlet of the filter assembly 10. The oil outlet pipeline of the filter assembly 10 is provided with a back pressure check valve 11, and is connected to the oil inlet of the hydraulic drive main line 6 by a quick connector. The hydraulic drive main line 6 and the filter assembly 10 form a closed circulation structure. The oil suction port and the leakage port of the hydraulic drive main line 6 are connected to the oil tank 12. The back pressure check valve 11 is used to pressurize the flushing system. Pressurization can improve the cleaning ability of the flushing system, improve the cleaning efficiency, and ensure the cleanliness of the flushing system.

[0025] The two main pipes 1 of the filter assembly 10 are respectively connected with a pressure detection device, and a first shockproof pressure gauge 9 or a pressure sensor with a range of 0-60bar is selected. The pressure detection device is connected to the oil inlet pipeline of the hydraulic drive main line 6, and a second shockproof pressure gauge 13 or a pressure sensor with a range of 0-600bar is selected. The two pressure detection devices at the oil inlet and oil outlet of the filter assembly 10 are used to detect the pressure of the flushing system. By comparing the pressure difference between the front and rear ends of the filter unit, it is more intuitive to determine whether the flow of the filter unit is appropriate, so as to decide whether to increase the filter unit to adapt to the flow of the flushing system. The pressure detection device on the oil inlet pipeline of the hydraulic drive main line 6 is used to detect the rotation direction of the closed pump when starting up. If the rotation direction of the closed pump is incorrect and oil is discharged through the oil inlet, the pressure of the second shockproof pressure gauge 13 increases sharply. At this time, it is necessary to energize another coil of the closed pump control solenoid valve, so as to change the oil outlet position of the closed pump to normal, so that the system can perform flushing work normally.

[0026] The diameter and length of the flushing main line 8 correspond to the connected hydraulic drive main line 6. The diameter and length, flow rate and hydraulic oil viscosity are important factors affecting the flushing effect. Different hydraulic drive main lines 6 use different flow rates and different flushing main lines 8.

[0027] The number of filter units in use is controlled by opening and closing the ball valve 4 , and the number of filter units opened is adjusted according to the hydraulic drive main line 6 to be cleaned.

[0028] The hydraulic drive main line 6 adopts a closed pump, which is an electric proportional control variable pump. The oil suction port and the leakage port of the hydraulic drive main line 6 are connected to the oil tank 12. The drive main lines 6 of different pipe diameters adopt different flow rates, and the displacement of the closed pump can be controlled by adjusting the control current, so as to achieve the purpose of accurately controlling the flow rate of the pipeline, thereby achieving the best flushing effect. The hydraulic oil of the closed circuit is the oil in the closed pipeline, but the hydraulic drive device inevitably has a small amount of oil leakage. A small capacity oil tank is set to flow out and compensate for the leaked oil.

[0029] like Figure 4 An embodiment of the invention comprises four hydraulic drive main lines 6 and a filter assembly 10, the oil outlets and oil inlets of the four hydraulic drive main lines 6 are respectively connected with quick connectors, the quick connectors of the oil outlets are connected to the quick connectors 7 of the flushing main line 8 through pipelines in turn, the other end of the flushing main line 8 is connected to three connectors 2 of the filter assembly 10 through a quick connector, and the other filter units are closed by a ball valve, a back pressure check valve 11 is installed on the pipeline connected to the oil outlet connector 2 on the other side of the filter assembly 10, a pressure measuring device is installed on the pipeline through the quick connector, and the other end is connected to the quick connector of the oil inlet of the hydraulic drive main line 6, the four hydraulic drive main lines 6 and the filter assembly 10 form a closed circulation structure through the quick connector 7 and the main line 8, and the oil suction port and leakage port of the four hydraulic drive main lines 6 are connected to the oil tank 12.

[0030] The action process of the present invention is as follows:

[0031] First, the quick plug 7 of the hydraulic drive main line 6 in the system needs to be removed from other components, the system hydraulic components are isolated, installed on the filter system, and some pipelines are connected end to end to realize the flushing structure. The back pressure check valve 11 is a tubular back pressure check valve, which is easy to disassemble and assemble. A variety of back pressure check valves can be selected and replaced according to the system flow and back pressure. According to the number and size of the flushing hydraulic drive main lines 6, check the flushing standards, determine the flushing flow rate, calculate the flushing flow rate by the flushing flow rate and the inner diameter of the pipeline, the pressure value of the back pressure check valve 6 can be determined by the flushing flow rate, the flow selection of the filter assembly 10 can be determined by the flushing flow rate, and several filter units can be selected. The closed pump of the hydraulic drive main line 6 controls the current value when determining the speed of the engine or motor. The hydraulic oil tank 12 is the hydraulic system oil tank of this equipment. After confirming each control part, start the closed pump, the system hydraulic oil starts to circulate, driving the impurities in the pipeline to remain on the filter element in the filter. After the system stops running, replace the filter element, disassemble the filter assembly 10 and its connectors, and complete the flushing of the hydraulic drive main line 6.

[0032] The filter assembly 10 is installed in the power compartment, and labels matching the closed pump control current, the number of filters 5 to be opened, and the diameter of the flushing pipeline can be affixed to the filter assembly 10, which is more convenient for on-site personnel to operate and facilitate construction.

[0033] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A closed circulation system for flushing a hydraulic drive main line, characterized by: The invention comprises a hydraulic drive main line (6) and a filter assembly (10), wherein the oil outlet of the hydraulic drive main line (6) is connected to the filter assembly (10) via a flushing main line (8), and the other end of the filter assembly (10) is connected to the oil inlet of the hydraulic drive main line (6). The hydraulic drive main line (6) and the filter assembly (10) form a closed circulation structure, and the number of the hydraulic drive main lines (6) is one or more; The filter assembly (10) comprises a main pipe (1), a joint (2), a flange (3), a ball valve (4), and a filter (5); the two ends of the filter (5) are connected to the ball valve (4) to form a filter unit; the two ends of the filter unit are connected to the inner sides of two parallel main pipes (1); one end of the two main pipes (1) is a blind hole, and the other end is sealed by the flange (3); a plurality of joints (2) are arranged on the outside of the two main pipes (1); the joints (2) on one side serve as an oil inlet, and the joints (2) on the other side serve as an oil outlet; the number of the filter units is multiple; Two quick connectors (7) are provided at both ends of the flushing main line (8), one of the quick connectors (7) is connected to the oil outlet of the hydraulic drive main line (6), and the other quick connector (7) is connected to the oil inlet of the connection filter assembly (10); a back pressure check valve (11) is provided on the oil outlet pipeline of the filter assembly (10), and the back pressure check valve (11) is connected to the oil inlet of the hydraulic drive main line (6) through a quick connector (7).

2. The closed circulation system for flushing hydraulic drive main pipeline according to claim 1 is characterized by: The plurality of connectors (2) are arranged at equal intervals, and the connectors (2) are provided with a variety of specifications. Connectors (2) of different specifications are suitable for connecting connecting pipes of different diameters.

3. The closed circulation system for flushing hydraulic drive main pipeline according to claim 1, characterized in that: The two main pipes (1) are respectively connected with a pressure detection device, and the pressure detection device is a first shock-resistant pressure gauge (9) or a pressure sensor with a measuring range of 0-60 bar; a pressure detection device is connected to the oil inlet pipeline of the hydraulic drive main pipe (6), and the pressure detection device is a second shock-resistant pressure gauge (13) or a pressure sensor with a measuring range of 0-600 bar.

4. The closed circulation system for flushing hydraulic drive main pipeline according to claim 1, characterized in that: The diameter and length of the flushing main line (8) correspond to the connected hydraulic drive main line (6).

5. The closed circulation system for flushing hydraulic drive main pipeline according to claim 1, characterized in that: The number of filter units in use is controlled by opening and closing the ball valve (4), and the number of filter units opened is adjusted according to the hydraulic drive main line (6) to be cleaned.

6. The closed circulation system for flushing hydraulic drive main pipeline according to claim 1, characterized in that: The hydraulic drive main line (6) adopts a closed pump, which is an electric proportional control variable pump. The oil suction port and leakage port of the hydraulic drive main line (6) are connected to the oil tank (12).

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