Independent control hydraulic system of ultra-large mining excavator and using method

Abstract

The independent control hydraulic system of the ultra-large mining excavator comprises a plurality of pump sets, each pump set is connected with a main valve, a plurality of working units are arranged in each main valve, and each main valve is provided with a working unit connected with a movable arm oil cylinder, a bucket rod oil cylinder and a bucket oil cylinder. The working unit is connected with the left walking motor, the opening and closing bucket oil cylinder, the rotary motor and the right walking motor, and two control ends of the working unit are proportional control ends. According to the independent control hydraulic system of the ultra-large mining excavator and the using method, one pump set controls one set of main valves, independent control over a plurality of working sets of the same executing mechanism is achieved, the oil inlet and return through-flow area requirements can be met at the same time, the speed is guaranteed, meanwhile, back pressure is convenient to adjust, and action smoothness is improved; meanwhile, through independent control of different pump sets and different working sets of the same valve set, independent oil supply of an executing mechanism can be achieved, load difference losses between composite actions are reduced, energy consumption is reduced, and operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to an independent control hydraulic system for an ultra-large mining excavator and a use method thereof. Background Art

[0002] Ultra-large mining excavators are characterized by high pressure and ultra-large flow. To meet the large flow requirements, a multi-pump group and multi-main valve hydraulic system is generally adopted. One pump group controls one main valve, and working links of different actuators are arranged on the same main valve. The same actuator is jointly controlled by multiple working links distributed on different main valves. The multiple working links that control the same actuator merge after the valve and then enter the actuator cylinder, thereby further improving the flow level.

[0003] Pump sets typically use two pumps, with a single main valve inlet. The two pumps combine after the pump outlets and then enter the main valve inlet, increasing flow. However, this method of combining the two pump flows before entering the main valve only achieves simple flow addition, treating them as a single oil source; it cannot independently control the two flows.

[0004] At the same time, in order to meet the coordination requirements of the complex movements of ultra-large mining excavators, the existing technology adopts a series-parallel combination of main valves, relying on the valve core shoulder to control the on-off of the oil circuit, so that the flow is preferentially distributed to the working link close to the oil inlet, while the remote working link receives no flow or very little flow, and the flow distribution capacity is limited.

[0005] At present, the pilot system of ultra-large mining excavators adopts the pilot oil source block method. The pilot oil controls the reversing of the working links on multiple valve groups after passing through the proportional solenoid valve. That is, multiple working links of the same actuator are controlled by the same proportional solenoid valve. These multiple working links act simultaneously and cannot be controlled independently, which is not conducive to the adjustment of return oil back pressure.

[0006] The current super-large mining excavator systems and main valves often have the following shortcomings: a) The two pumps in the pump group merge before the valve and then enter the main valve. The two pumps are coupled with each other, making it impossible to achieve independent control of the flow of the two pumps; b) Using the serial-parallel working mode to prioritize time flow, the priority capacity is limited; c) Multiple working links of the same actuator are set on different main valves. Multiple working links work in reverse direction at the same time, which cannot realize independent control of different working links and poor coordination of action; d) The working links of the same actuator are reversed at the same time, resulting in large throttling losses in the system; e) The oil inlet and return of the same working link are controlled by the same valve core. When one of them needs a small opening, the other can only have a small opening as well. They are coupled with each other and the throttling loss is large. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide an independent control hydraulic system and a method for use of an ultra-large mining excavator that can realize independent oil supply to the actuator and reduce the load difference loss between compound actions.

[0008] The present invention is implemented through the following technical solution: an independently controlled hydraulic system for an ultra-large mining excavator, comprising a plurality of pump groups, each of which is connected to a main valve, the main valve being provided with an oil inlet connected to different main pumps in the pump group, the main valve being provided with a plurality of working links, each main valve having a working link connected to a boom cylinder, an arm cylinder and a bucket cylinder, and also having a working link connected to a left travel motor, an opening and closing bucket cylinder, a rotary motor and a right travel motor, the left travel motor, the opening and closing bucket cylinder, the rotary motor and the right travel motor being respectively connected to a working link, and the two control ends of the working link being proportional control ends.

[0009] It is further stated that there are four pump groups, namely pump group I, pump group II, pump group III and pump group IV, and pump group I, pump group II, pump group III and pump group IV are respectively connected to main valve I, main valve II, main valve III and main valve IV.

[0010] Two main pumps are respectively provided in the pump group I, pump group II, pump group III and pump group IV, and two independent oil inlets are provided on the main valve I, main valve II, main valve III and main valve IV.

[0011] There are four working links in the main valve I, which are the left walking link connected to the left walking motor, the bucket arm 1 link connected to the bucket cylinder, the bucket 1 link connected to the bucket cylinder and the boom 1 link connected to the boom cylinder. The pump group I includes a main pump I and a main pump II. The main pump I is connected to the oil inlet end of the left walking link and the bucket arm 1 link through a one-way valve, and the main pump II is connected to the oil inlet end of the bucket 1 link and the boom 1 link through a one-way valve. The main pump I is merged with the oil supply pipeline of the main pump II through the left walking link, the bucket arm 1 link and the one-way valve, and the main pump II is merged with the oil supply pipeline of the main pump I through the bucket 1 link, the boom 1 link and the one-way valve.

[0012] There are four working links in the main valve II, which are the opening and closing bucket link connected to the opening and closing bucket cylinder, the arm 2 link connected to the arm cylinder, the bucket 2 link connected to the bucket cylinder and the boom 2 link connected to the boom cylinder. The pump group II includes a main pump III and a main pump IV. The main pump III is connected to the oil inlet end of the opening and closing bucket link and the arm 2 link through a one-way valve, and the IV is connected to the oil inlet end of the bucket 2 link and the boom 2 link through a one-way valve. The main pump III is merged with the oil supply pipeline of the main pump IV through the opening and closing bucket link, the arm 2 link and the one-way valve. The main pump IV is merged with the oil supply pipeline of the main pump III through the bucket 2 link, the boom 2 link and the one-way valve.

[0013] The main valve III is provided with three working links, namely the boom 3-link connecting the boom cylinder, the slewing link connecting the slewing motor, and the arm / bucket link connecting the dipper cylinder and the bucket cylinder. The dipper / bucket link is connected to the rodless cavity of the dipper cylinder and the bucket cylinder. The pump group III includes a main pump V and a main pump VI. The main pump V is connected to the oil inlet end of the boom 3-link through a one-way valve. The main pump VI is connected to the oil inlet end of the slewing link and the arm / bucket link through a one-way valve. The main pump V is merged with the oil supply pipeline of the main pump VI through the boom 3-link and the one-way valve. The main pump VI is merged with the oil supply pipeline of the main pump V through the slewing link, the dipper / bucket link and the one-way valve.

[0014] The main valve IV is provided with four working links, namely the right travel link connected to the right travel motor, the bucket 4 link connected to the bucket cylinder, the boom 4 link connected to the arm cylinder and the dipper arm 4 link connected to the dipper arm cylinder. The pump group IV includes a main pump VII and a main pump VIII. The main pump VII is connected to the oil inlet end of the right travel link and the bucket 4 link through a one-way valve. The main pump VIII is connected to the oil inlet end of the boom 4 link and the dipper arm 4 link through a one-way valve. The main pump VII is merged with the oil supply pipeline of the main pump VIII through the right travel link, the bucket 4 link and the one-way valve. The main pump VIII is merged with the oil supply pipeline of the main pump VII through the boom 4 link, the dipper arm 4 link and the one-way valve.

[0015] The working link is a three-position eight-way electromagnetic proportional reversing valve.

[0016] The working link is a three-position eight-way hydraulically controlled reversing valve, both ends of which are connected to proportional solenoid valves. The working link also includes a pilot pump, and the proportional solenoid valve is supplied with oil through the pilot pump.

[0017] A method for using an independently controlled hydraulic system for an ultra-large mining excavator, wherein the working link is controlled by a controller to switch working positions and adjust the flow rate of the working positions: During a single action, the controller controls all the working joints connected to the actuator, controls the number of working joints related to the action, and matches the appropriate flow and working joint opening amount according to the required speed of the cylinder and motor; During compound actions, the controller controls the working links connected to the compound action actuators, controls the number of working links related to the actions added to the work, and the positions of the main valves of the working links added to the work, and matches the appropriate flow and working link opening amount according to the required speed of the cylinder and motor; The executive elements include a left travel motor, a boom oil cylinder, a bucket rod oil cylinder, a bucket opening and closing oil cylinder, a rotary motor, a bucket oil cylinder and a right travel motor.

[0018] The present invention has the following advantages: the independent control hydraulic system and use method of the super-large mining excavator of the present invention are suitable for large mining excavators, and mainly include multiple pump groups, multiple main valves, integrated electronically controlled pilots, actuators and hydraulic oil tanks, etc. One pump group controls a group of main valves to achieve independent control of multiple working links of the same actuator, which can simultaneously ensure the inlet and return oil flow area requirements, ensure the speed while facilitating the adjustment of back pressure, and improve the smoothness of the movement; at the same time, the independent control of different pump groups and different working links of the same valve group can achieve independent oil supply to the actuator, reduce the load difference loss between compound actions, reduce energy consumption and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, as part of this disclosure, are intended to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are intended to explain the disclosure and do not constitute undue limitations thereon. Obviously, the drawings described below are merely examples, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0020] In the attached figure: Figure 1 It is the hydraulic principle diagram of the present invention; Figure 2 This is a hydraulic principle diagram of the main valve I of the present invention; Figure 3 This is a hydraulic principle diagram of the main valve II of the present invention; Figure 4 This is a hydraulic principle diagram of the main valve III of the present invention; Figure 5 It is a hydraulic principle diagram of the main valve IV of the present invention.

[0021] In the figure: 1. Pump group I, 2. Pump group II, 3. Pump group III, 4. Pump group IV, 5. Pilot pump, 6. Pilot safety valve, 7. Main valve I, 8. Main valve II, 9. Main valve III, 10. Main valve IV, 11. Left travel motor, 12. Boom cylinder, 13. Arm cylinder, 14. Bucket opening and closing cylinder, 15. Slewing motor, 16. Bucket cylinder, 17. Right travel motor 18, fuel tank, 101, main pump I, 102, main pump II, 201, main pump III, 202, main pump IV, 301, main pump V, 302, main pump VI, 401, main pump VII, 402, main pump VIII, 701, left travel link, 702, bucket 1 link, 703, bucket 1 link, 704, boom 1 link, 705-706, relief valve, 707- 714, proportional solenoid valve, 715, -720, one-way valve, 801, open and close bucket link, 802, arm 2 links, 803, bucket 2 links, 804, boom 2 links, 805-806, relief valve, 807-814, proportional solenoid valve, 815, -820, one-way valve, 901, boom 3 links, 902, swing link, 903, arm / bucket link, 904-905, relief valve, 906-911, proportional solenoid valve, 912-915 one-way valve, 1001, right travel link, 1002, bucket 4 links, 1003, boom 4 links, 1004, arm 4 links, 1005-1006, relief valve, 1007-1014, proportional solenoid valve, 1015-1020, one-way valve.

[0022] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] like Figures 1 to 5 The shown embodiment shows an independently controlled hydraulic system for an ultra-large mining excavator, comprising several pump groups, each of which is connected to a main valve, wherein the main valve is provided with an oil inlet connected to different main pumps in the pump group, and the main valve is provided with a plurality of working links, each of which has a working link connected to the boom cylinder 12, the dipper cylinder 13 and the bucket cylinder 16, and is also provided with a working link connected to the left travel motor 11, the opening and closing bucket cylinder 14, the rotary motor 15 and the right travel motor 17. The left travel motor 11, the opening and closing bucket cylinder 14, the rotary motor 15 and the right travel motor 17 are respectively connected to a working link, and the two control ends of the working link are proportional control ends. The ultra-large mining excavator of the present invention independently controls the hydraulic system and is provided with multiple pump groups, each of which is independent of each other to meet the system's ultra-large flow requirements; each pump group is connected to a main valve, each of which is independent of each other, and a group of main valves is provided with working links of different actuators, which are independently controlled. Multiple working links of the same actuator are arranged on multiple main valves, and the flow direction of the main oil circuit is controlled by the different working positions of each working link on the main valve, and the oil of the same actuator is controlled to merge after the main valve into the large cavity or small cavity of the oil cylinder, as well as the A port or B port of the motor, so that the oil cylinder can be raised or lowered. By increasing the flow rate of the oil pump and reducing the oil pressure, the oil return pressure can be adjusted independently without affecting the oil supply, thereby improving the smoothness of the movement. In addition, during compound movements, each actuator can be controlled by an independent main pump and main valve, thereby realizing decoupling of compound movements, improving movement coordination, and making the control method flexible.

[0027] like Figures 1 to 5The illustrated example shows an independently controlled hydraulic system for an ultra-large mining excavator. The system comprises four pump groups: pump group I1, pump group II2, pump group III3, and pump group IV4. Each of these pump groups is connected to a main valve I7, main valve II8, main valve III9, and main valve IV10, respectively. Each of these pump groups I1, II2, III3, and IV4 is equipped with two main pumps, and each of these main valves I7, II8, III9, and IV10 is equipped with two independent oil inlets. The present invention adopts four groups of pump groups, and dual pumps are used in the pump groups. Multiple groups of dual pumps can meet the large flow requirements of mining excavators. At the same time, four main valves are adopted, and the main valves adopt a modular design. The system applicability is strong. The main valve adopts a dual oil inlet form based on the series-parallel structure. The dual pump flow enters the main valve separately based on the dual oil inlet. It can realize the dual pump flow after merging in the valve to supply a single working link, and can also realize separate supply of two or more working links, realizing independent control between the dual pumps, taking into account the large flow requirements of single action and the proportional distribution of compound action flow; it can also realize single group of main pump + main valve controlling a single actuator during compound action, ensuring coordination while simplifying the control program; adopting integrated pilot control, each working link of multiple valve groups is controlled by an independent proportional solenoid valve, realizing decoupling between multiple working links of the same actuator, improving control flexibility, and reducing energy loss.

[0028] like Figures 1 to 5 The illustrated example shows an independently controlled hydraulic system for an ultra-large mining excavator. The working link is a three-position, eight-way electromagnetic proportional directional control valve. This electromagnetic proportional directional control valve is controlled by a controller at both ends of the working link to adjust the working position and opening size to meet system operation requirements. The three-position, eight-way working link allows the main pump's low flow rate to return to the oil tank through the main valve in the neutral position, preventing pressure buildup in the main pump and improving overall machine response speed.

[0029] like Figures 1 to 5 The shown embodiment shows an independent control hydraulic system for a super-large mining excavator, wherein the working link is a three-position eight-way hydraulically controlled reversing valve, and both ends of the working link are connected to proportional solenoid valves, and also includes a pilot pump 5, and the proportional solenoid valve is supplied with oil through the pilot pump 5. The working link of the present invention can also adopt a hydraulically controlled reversing valve, and both hydraulically controlled ends are connected to the proportional solenoid valve, and the hydraulic controlled end is controlled by the proportional solenoid valve to control the input and flow of the oil, thereby realizing the switching of the working link and the adjustment of the opening degree. Each working link is controlled by two independent proportional solenoid valves to realize independent control of each working link, wherein the pilot oil is provided for the work by the pilot pump, and the proportional solenoid valve is arranged between the pilot pump and the hydraulic controlled end, combined with Figure 1The pilot pump provides pilot oil to main valve I, main valve II, main valve III and main valve IV through oil ports Pf1, Pf2, Pf3 and Pf4 respectively. After passing through the proportional solenoid valve, it acts on the end face of the working valve core to control the valve core switching action, and then controls the left travel motor, boom cylinder, dipper cylinder, bucket opening and closing cylinder, rotary motor, bucket cylinder and right travel motor to complete the corresponding actions.

[0030] like Figure 1 and Figure 2The hydraulic system of a super large mining excavator is independently controlled. The main valve I7 is provided with four working links, namely a left travel link 701 connected to the left travel motor 11, a bucket link 1 link 702 connected to the bucket cylinder 13, a bucket link 1 link 703 connected to the bucket cylinder 16, and a boom link 1 link 704 connected to the boom cylinder 12. The pump group I1 includes a main pump I101 and a main pump II102. The main pump I101 is connected to the left travel link through a one-way valve. 701 and the oil inlet end of the boom 1 unit 702 are connected together, and the main pump II 102 is connected to the oil inlet end of the bucket 1 unit 703 and the boom 1 unit 704 through a one-way valve. The main pump I 101 is merged with the oil supply pipeline of the main pump II 102 through the left walking unit 701, the boom 1 unit 702 and the one-way valve, and the main pump II 102 is merged with the oil supply pipeline of the main pump I 101 through the bucket 1 unit 703, the boom 1 unit 704 and the one-way valve. The main valve I of the present invention is provided with a left walking link 701, a bucket link 1 702, a bucket link 1 703, a boom link 1 704, relief valves 705, 706, proportional solenoid valves 707-714, and is also provided with oil inlets P1, P2, an oil return port T1, a pilot oil inlet Pf1, a pilot oil return port Dr1, working oil ports Atl, Btl, Aa1, Ba1, Ac1, Bc1, Ab1, Bb1; wherein, the P1 oil port is connected to the left walking link 701, the bucket I link 702, the bucket I link 704, the boom I link 70 4 is connected to the return oil port T1; the P1 oil port is simultaneously connected to the left travel link 701 through a one-way valve 715, and then connected to the working oil ports Atl and Btl; the P1 oil port is simultaneously connected to the arm I link 702 through a one-way valve 716, and then connected to the working oil ports Aa1 and Ba1; the P1 oil port is simultaneously connected to the bucket I link 703 through one-way valves 718 and 719, and then connected to the working oil ports Ac1 and Bc1; the P1 oil port is simultaneously connected to the boom I link 704 through one-way valves 718 and 720, and then connected to the working oil ports Ab1 and Bb1. The P2 oil port is connected to the return oil port T1 through the boom I connection 704, the bucket I connection 703, the arm I connection 702, and the left traveling connection 701; the P2 oil port is simultaneously connected to the boom I connection 704 through the one-way valve 720, and then connected to the working oil ports Ab1 and Bb1; the P2 oil port is simultaneously connected to the bucket I connection 703 through the one-way valve 719, and then connected to the working oil ports Ac1 and Bc1; the P2 oil port is simultaneously connected to the arm I connection 702 through the one-way valves 717 and 716, and then connected to the working oil ports Aa1 and Ba1; the P2 oil port is simultaneously connected to the left traveling connection 701 through the one-way valves 717 and 715, and then connected to the working oil ports Atl and Btl.

[0031] like Figure 1 and Figure 3The hydraulic system of a super large mining excavator is independently controlled. The main valve II8 is provided with four working links, namely, the opening and closing bucket link 801 connected to the opening and closing bucket cylinder 14, the arm 2 link 802 connected to the arm cylinder 13, the bucket 2 link 803 connected to the bucket cylinder 16, and the arm 2 link 804 connected to the boom cylinder 12. The pump group II2 includes a main pump III 201 and a main pump IV 202. The main pump III 201 is connected to the opening and closing bucket cylinder 14 through a one-way valve. The oil inlet end of the bucket link 801 and the arm link 802 are connected together, and the IV202 is connected to the oil inlet end of the bucket link 803 and the boom link 804 through a one-way valve. The main pump III201 is connected to the oil supply line of the main pump IV202 by opening and closing the bucket link 801, the arm link 802 and the one-way valve. The main pump IV202 is connected to the oil supply line of the main pump III201 through the bucket link 803, the boom link 804 and the one-way valve. The main valve II of the present invention Figure 3 The figure shows the hydraulic principle diagram of main valve 28. The main valve is equipped with an opening and closing bucket link 801, a second arm link 802, a second bucket link 803, a second boom link 804, relief valves 805 and 806, and proportional solenoid valves 807-814. It also has oil inlets P3 and P4, an oil return port T2, a pilot oil inlet Pf2, a pilot oil return port Dr2, and working oil ports Ad, Bd, Aa2, Ba2, Ac2, Bc2, Ab2, and Bb2. The P3 oil port is connected to the return oil port T2 through the opening and closing bucket link 801, the arm link 2 802, the bucket link 2 803, and the boom link 2 804; the P3 oil port is simultaneously connected to the opening and closing bucket link 801 through the one-way valve 815, and then connected to the working oil ports Ad and Bd; the P3 oil port is simultaneously connected to the arm link 2 802 through the one-way valve 816, and then connected to the working oil ports Aa2 and Ba2; the P3 oil port is simultaneously connected to the bucket link 2 803 through the one-way valves 818 and 819, and then connected to the working oil ports Ac2 and Bc2; the P3 oil port is simultaneously connected to the boom link 2 804 through the one-way valves 818 and 820, and then connected to the working oil ports Ab2 and Bb2. The P4 oil port is connected to the return oil port T2 through the boom 2-connection 804, the bucket 2-connection 803, the arm 2-connection 802 and the opening and closing bucket connection 801; the P4 oil port is simultaneously connected to the boom 2-connection 804 through the one-way valve 820, and then connected to the working oil ports Ab2 and Bb2; the P4 oil port is simultaneously connected to the bucket 2-connection 803 through the one-way valve 819, and then connected to the working oil ports Ac2 and Bc2; the P4 oil port is simultaneously connected to the arm 2-connection 802 through the one-way valves 817 and 816, and then connected to the working oil ports Aa2 and Ba2; the P4 oil port is simultaneously connected to the opening and closing bucket connection 801 through the one-way valves 817 and 815, and then connected to the working oil ports Ad and Bd.

[0032] like Figure 1 and Figure 4The figure shows an independent control hydraulic system for a super-large mining excavator. The main valve III 9 is provided with three working links, namely, a boom 3 link 901 connected to the boom cylinder 12, a swing link 902 connected to the swing motor 15, and a bucket / arm link 903 connected to the bucket cylinder 13 and the bucket cylinder 16. The bucket / bucket link 903 is connected to the rodless cavity of the bucket cylinder 13 and the bucket cylinder 16. The pump group III 3 includes a main pump V 301 and a main pump VI 30 2. The main pump V301 is connected to the oil inlet end of the boom 3-link 901 through a one-way valve, and the main pump VI302 is connected to the oil inlet ends of the rotary link 902 and the arm / bucket link 903 through a one-way valve. The main pump V301 merges with the oil supply pipeline of the main pump VI302 through the boom 3-link 901 and the one-way valve, and the main pump VI302 merges with the oil supply pipeline of the main pump V301 through the rotary link 902, the arm / bucket link 903 and the one-way valve. The main valve III of the present invention is provided with a boom 3-link 901, a relief valve 905, a swing link 902, an arm / bucket link 903, relief valves 904, 905, and proportional solenoid valves 906~911. It is also provided with oil inlets P5 and P6, an oil return port T3, a pilot oil inlet Pf3, a pilot oil return port Dr3, and working oil ports Ab3, Bb3, As, Bs, Ba3, and Bc3. The P5 oil port is connected to the return oil port T3 through the boom 3-connection 901, the rotary connection 902, and the arm / bucket connection 903; the P5 oil port is simultaneously connected to the boom 3-connection 901 through the one-way valve 912, and then connected to the working oil ports Ab3 and Bb3; the P5 oil port is simultaneously connected to the rotary connection 902 through the one-way valves 913 and 914, and then connected to the working oil ports As and Bs; the P5 oil port is simultaneously connected to the arm / bucket connection 903 through the one-way valves 913 and 915, and then connected to the working oil ports Ba3 and Bc3. The P6 oil port is connected to the return oil port T3 through the arm / bucket connection 903, the swing connection 902, and the boom 3 connection 901; the P6 oil port is simultaneously connected to the arm / bucket connection 903 through the one-way valve 915, and then connected to the working oil ports Ba3 and Bc3; the P6 oil port is simultaneously connected to the swing connection 902 through the one-way valve 914, and then connected to the working oil ports As and Bs; the P6 oil port is simultaneously connected to the boom 3 connection 901 through the one-way valve 912, and then connected to the working oil ports Ab3 and Bb3.

[0033] like Figure 1 and Figure 5The figure shows an independent control hydraulic system for a super-large mining excavator. The main valve IV10 is provided with four working links, namely a right travel link 1001 connected to the right travel motor 17, a bucket 4 link 1002 connected to the bucket cylinder 16, a boom 4 link 1003 connected to the boom cylinder 12, and a bucket 4 link 1004 connected to the arm cylinder 13. The pump group IV4 includes a main pump VII401 and a main pump VIII402. The main pump VII401 is connected to the right travel link 1001 through a one-way valve. 001 and the oil inlet end of the bucket 4-unit 1002 are connected together, the main pump VIII 402 is connected together with the oil inlet end of the boom 4-unit 1003 and the dipper arm 4-unit 1004 through a one-way valve, the main pump Ⅶ 401 is merged with the oil supply pipeline of the main pump VIII 402 through the right walking unit 1001, the bucket 4-unit 1002 and the one-way valve, the main pump VIII 402 is merged with the oil supply pipeline of the main pump Ⅶ 401 through the boom 4-unit 1003, the dipper arm 4-unit 1004 and the one-way valve. The main valve IV of the present invention is provided with a right walking link 1001, a bucket 4-link 1002, a boom 4-link 1003, a dipper arm 4-link 1004, a relief valve 1005, a relief valve 1006, and proportional solenoid valves 1007-1014. It is also provided with oil inlets P7 and P8, an oil return port T4, a pilot oil inlet Pf4, a pilot oil return port Dr4, and working oil ports Atr, Btr, Ac4, Bc4, Ab4, Bb4, Aa4, and Ba4. The P7 oil port is connected to the return oil port T4 through the right traveling link 1001, the bucket 4-link 1002, the boom 4-link 1003, and the arm 4-link 1004; the P7 oil port is simultaneously connected to the right traveling link 1001 through the one-way valve 1015, and then connected to the working oil ports Atr and Btr; the P7 oil port is simultaneously connected to the bucket 4-link 1002 through the one-way valve 1016, and then connected to the working oil ports Ac4 and Bc4; the P7 oil port is simultaneously connected to the boom 4-link 1003 through the one-way valves 1018 and 1019, and then connected to the working oil ports Ab4 and Bb4; the P7 oil port is simultaneously connected to the arm 4-link 1004 through the one-way valves 1018 and 1020, and then connected to the working oil ports Aa4 and Ba4. The P8 oil port is connected to the return oil port T4 through the boom 4-link 1004, the arm 4-link 1003, the bucket 4-link 1002, and the right traveling link 1001; the P8 oil port is simultaneously connected to the boom 4-link 1004 through the one-way valve 1020, and then connected to the working oil ports Aa4 and Ba4; the P4 oil port is simultaneously connected to the boom 4-link 1003 through the one-way valve 1019, and then connected to the working oil ports Ab4 and Bb4; the P8 oil port is simultaneously connected to the bucket 4-link 1002 through the one-way valves 1017 and 1016, and then connected to the working oil ports Ac4 and Bc4; the P8 oil port is simultaneously connected to the right traveling link 1001 through the one-way valves 1017 and 1015, and then connected to the working oil ports Atr and Btr.

[0034] A method for using an independently controlled hydraulic system for an ultra-large mining excavator, wherein the working link is controlled by a controller to switch working positions and adjust the flow rate of the working positions: During a single action, the controller controls all the working joints connected to the actuator, controls the number of working joints related to the action, and matches the appropriate flow and working joint opening amount according to the required speed of the cylinder and motor; During compound actions, the controller controls the working links connected to the compound action actuators, controls the number of working links related to the actions added to the work, and the positions of the main valves of the working links added to the work, and matches the appropriate flow and working link opening amount according to the required speed of the cylinder and motor; The actuators include a left travel motor 11 , a boom cylinder 12 , an arm cylinder 13 , a bucket opening and closing cylinder 14 , a rotary motor 15 , a bucket cylinder 16 and a right travel motor 17 .

[0035] The working process of the independent control hydraulic system of the ultra-large mining excavator of the present invention is as follows: When there is no action, a small amount of oil in the main pumps 101 and 102 returns to the oil tank through the main valve I7 oil port P1, oil port P2, working link, and return oil port T1; a small amount of oil in the main pumps 201 and 202 returns to the oil tank through the main valve II8 oil port P3, oil port P4, working link, and return oil port T2; a small amount of oil in the main pumps 301 and 302 returns to the oil tank through the main valve III9 oil port P5, oil port P6, working link, and return oil port T3; a small amount of oil in the main pumps 401 and 402 returns to the oil tank through the main valve IV10 oil port P7, oil port P8, working link, and return oil port T4, to prevent system pressure buildup and improve system response speed.

[0036] Single actions include boom raising, boom lowering, arm swinging and retracting, bucket swinging and retracting, and bucket opening and closing. The working principles of arm swinging and retracting, bucket swinging and retracting, and bucket opening and closing are similar to those of boom raising and lowering. The following describes boom raising and boom lowering separately: Boom lift: When proportional solenoid valve 713 is energized, the pilot oil pumped out by pilot pump 5 reaches the left end of boom unit 1 704 through pilot oil inlet Pf1 and proportional solenoid valve 713, pushing boom unit 1 704 to switch to the left position. The oil from main pump 101 reaches check valve 720 through oil inlet P1 of main valve 7, left travel unit 701, arm unit 1 702, and check valve 718. The oil from main pump 102 reaches check valve 720 through oil inlet P2 of main valve 7. The oil from main pumps 101 and 102 merges at check valve 720 and enters boom unit 1 704. It then reaches the large chamber of the boom cylinder through oil port Ab1. The oil in the small chamber of the boom cylinder returns to tank 18 through oil port Bb1, boom unit 1 704, and oil return port T1.

[0037] At the same time, proportional solenoid valve 813 is energized, and the pilot oil pumped out by pilot pump 5 reaches the left end of boom 2 unit 804 through pilot oil inlet Pf2 and proportional solenoid valve 813, pushing boom 2 unit 804 to switch to the left position. The oil from main pump 201 reaches check valve 820 through oil inlet P3 of main valve 8, opening and closing bucket unit 801, boom 2 unit 802, and check valve 818. The oil from main pump 202 reaches check valve 820 through oil inlet P4 of main valve 8. The oils of main pumps 201 and 202 merge at check valve 820 and enter boom 2 unit 804. The oil reaches the large chamber of the boom cylinder through oil port Ab2. The oil in the small chamber of the boom cylinder returns to tank 18 through oil port Bb2, boom 2 unit 804, and oil return port T2.

[0038] At the same time, proportional solenoid valve 907 is energized, and the pilot oil pumped out by pilot pump 5 reaches the right end of boom 3-link 901 through pilot oil inlet Pf3 and proportional solenoid valve 907, pushing boom 3-link 901 to switch to the right position. The oil from main pump 301 reaches check valve 912 through oil inlet P5 of main valve 9. The oil from main pump 302 reaches check valve 912 through oil inlet P6 of main valve 9, arm / bucket link 903, swing link 902, and check valve 916. The oil from main pumps 301 and 302 merges at check valve 912 and enters boom 3-link 901. It then reaches the large chamber of the boom cylinder through oil port Ab3. The oil in the small chamber of the boom cylinder returns to tank 18 through oil port Bb3, boom 3-link 901, and return port T3.

[0039] At the same time, proportional solenoid valve 1012 is energized, and the pilot oil pumped out by pilot pump 5 reaches the right end of boom 4-unit 1003 through pilot oil inlet Pf4 and proportional solenoid valve 1012, pushing boom 4-unit 1003 to switch to the right position. The oil from main pump 401 reaches check valve 1019 through oil inlet P7 of main valve 10, right travel unit 1001, bucket 4-unit 1002, and check valve 1018. The oil from main pump 402 reaches check valve 1019 through oil inlet P8 of main valve 10. The oils of main pumps 401 and 402 merge at check valve 1019 and enter boom 4-unit 1003, reaching the large chamber of boom cylinder through oil port Ab4. The oil in the small chamber of boom cylinder returns to tank 18 through oil port Bb4, boom 4-unit 1003, and oil return port T4.

[0040] Through this approach, four pump groups and eight main pumps can simultaneously supply oil to the boom cylinders, ensuring the extremely large flow required during a single boom-lifting motion and enabling rapid movement. Furthermore, the eight main pumps are independent of each other, allowing for individual flow adjustments. Proportional solenoid valves 713, 813, 907, and 1012 are also independent and adjustable to control the switching displacement and opening volume of boom 1 unit 704, boom 2 unit 804, boom 3 unit 901, and boom 4 unit 1003, respectively. This ensures the appropriate flow rate and working unit opening volume match the desired boom cylinder speed.

[0041] Boom lowering: Similarly, proportional solenoid valves 714, 814, 906, and 1011 are energized, boom 1 unit 704 is in the right position, boom 2 unit 804 is in the right position, boom 3 unit 901 is in the left position, and boom 4 unit 1003 is in the left position. The oil from the main pumps 101, 102, 201, 202, 301, 302, 401, and 402 reaches the small chamber of the boom cylinder, and the oil in the large chamber of the boom cylinder returns to the oil tank 18 through the return oil port T1 of the main valve 7, the return oil port T2 of the main valve 8, the return oil port T3 of the main valve 9, and the return oil port T4 of the main valve 10.

[0042] Because the boom of an ultra-large mining excavator is very heavy, main valves 7, 8, 9, and 10 must provide sufficient back pressure during descent to offset the weight and prevent stalling. In this case, proportional solenoid valve 906 can be independently adjusted to minimize the displacement of boom 3-link 901, reducing the oil return area of the boom cylinder's large chamber. Furthermore, proportional solenoid valve 1011 can be adjusted as needed to minimize the displacement of boom 4-link 1003, further reducing the oil return area and achieving smooth boom descent.

[0043] Compound movements: Boom lift + arm swing: When proportional solenoid valves 713 and 710 are energized, pilot oil pumped from pilot pump 5 flows through pilot oil inlet Pf1 and proportional solenoid valves 713 and 710 to the left end of boom unit 1 704 and the right end of arm unit 1 702, respectively, pushing boom unit 1 704 to the left and arm unit 1 702 to the right. Oil from main pump 101 flows through oil inlet P1 of main valve 7, left travel unit 701, and check valve 716 to arm unit 1 702, and then through oil port Aa1 to the small chamber of arm cylinder 13. Oil in the large chamber of arm cylinder 13 then returns to tank 18 through oil port Ba1 and return port T1. The oil from the main pump 102 reaches the boom 1 unit 704 through the oil inlet P2 of the main valve 7 and the one-way valve 720, and reaches the large chamber of the boom cylinder 12 through the oil port Ab1. The oil in the small chamber of the boom cylinder 12 returns to the oil tank 18 through the oil port Bb1 and the return oil port T1.

[0044] When proportional solenoid valves 813 and 810 are energized, pilot oil from pilot pump 5 flows through pilot oil inlet Pf2 and proportional solenoid valves 813 and 810 to the left end of boom unit 804 and the right end of arm unit 802, respectively, pushing boom unit 804 to the left and arm unit 802 to the right. Oil from main pump 201 flows through main valve 8's oil inlet P3, the open / close bucket unit 801, and one-way valve 816 to arm unit 802. Then, it flows through port Aa2 to the small chamber of arm cylinder 13. The oil in the large chamber of arm cylinder 13 then returns to tank 18 through port Ba2 and return port T2. The oil from the main pump 202 reaches the boom 2 unit 804 through the oil inlet P4 of the main valve 8 and the one-way valve 820, and reaches the large chamber of the boom cylinder 12 through the oil port Ab2. The oil in the small chamber of the boom cylinder 12 returns to the oil tank 18 through the oil port Bb2 and the return oil port T2.

[0045] When proportional solenoid valve 907 is energized, pilot oil from pilot pump 5 flows through pilot inlet port Pf3 and proportional solenoid valve 907 to the right end of boom unit 3 901, pushing boom unit 3 901 to the right position. Oil from main pumps 301 and 302 merges at check valve 912, enters boom unit 3 901, and reaches the large chamber of the boom cylinder through port Ab3. Oil in the small chamber of the boom cylinder returns to tank 18 through port Bb3, boom unit 3 901, and return port T3.

[0046] Proportional solenoid valves 1012 and 1013 are energized, and pilot oil pumped out by pilot pump 5 reaches the right end of boom 4-link 1003 and the left end of arm 4-link 1004 through pilot oil inlet Pf4 and proportional solenoid valves 1012 and 1013, respectively, pushing boom 4-link 1003 to the right and arm 4-link 1004 to the left. Oil from main pump 401 reaches boom 4-link 1003 through oil inlet P7 of main valve 10, right travel link 1001, bucket 4-link 1002, and check valves 1018 and 1019, then reaches the large chamber of boom cylinder 12 through oil port Ab4. Oil in the small chamber of boom cylinder 12 returns to tank 18 through oil port Ba4 and return port T4. The oil from the main pump 402 reaches the boom 4-link 1004 through the oil inlet P8 of the main valve 10 and the one-way valve 1020, and reaches the small chamber of the boom cylinder 13 through the oil port Aa4. The oil in the large chamber of the boom cylinder 13 returns to the oil tank 18 through the oil port Ba4 and the return oil port T4.

[0047] Through the above process, the main pumps 101, 201, and 402 supply oil to the arm cylinder 13 through arm 1 connection 702, arm 2 connection 802, and arm 4 connection 1004 respectively, and the main pumps 102, 202, 301 and 302, 401 supply oil to the boom cylinder 12 through arm 1 connection 704, arm 2 connection 804, boom 3 connection 901, and boom 4 connection 1003 respectively, and each main pump is independently controlled, and each working connection is controlled by a separate proportional solenoid valve to provide flow on demand, thereby realizing decoupling of compound actions and effectively avoiding the problems of uneven flow distribution and poor coordination of actions caused by load differences in compound actions. At the same time, the two main pumps in the same pump group can be controlled by the power supply of the solenoid valves to merge and supply oil to a single working link. For example, if only the proportional solenoid valve 713 in the main valve 7 is energized, that is, only the boom 1 link 704 is reversed, the oil of the main pumps 101 and 102 in pump group 1 merges to supply oil to the boom 1 link 704, and the oil of the main pumps 201 and 202 in pump group 2 merges to supply oil to the bucket arm 2 link 802. The main pumps 301 and 302 in pump group 3 and the main pumps 401 and 402 in pump group 4 selectively supply oil to one or both of the working links of the boom and bucket arm as needed.

[0048] The same goes for other compound movements.

[0049] Turnaround + boarding: Getting on the vehicle includes the movements of the boom, dipper arm, bucket, and opening and closing the bucket.

[0050] Because swing inertia is very large, the heavy load often leads to insufficient swing flow when combined with other movements. This often results in the installation of a priority valve or the use of an independent closed swing system, increasing system complexity and cost. In this solution, the main pumps 301 and 302 in pump group 3 supply oil to the swing motor 15 via the swing coupling 902, while the six main pumps in the other three pump groups supply oil to the boom cylinder 12, arm cylinder 13, bucket opening and closing cylinder 14, and bucket cylinder 16, achieving decoupling between swing and loading.

[0051] Walking + getting on the bus: When combined travel and boarding, priority is given to travel. Main pumps 101 and 102 in pump group 1 supply oil to the left travel motor 11 via the left travel coupler 701, while main pumps 401 and 402 in pump group 4 supply oil to the right travel motor 17 via the right travel coupler 1001. Main pumps 101, 102, 401, 402, the left travel coupler 701, and the right travel coupler 1001 are independent of one another, enabling the machine to freely achieve both straight-line travel and steering. Main pumps 201 and 202 in pump group 2 and main pumps 301 and 302 in pump group 3 supply oil to the boarding actuator, enabling independent control of travel and boarding.

[0052] , The 1st hydraulic pump of the present invention is a kind of hydraulic system with independent control and use method of super-large mining excavator, and adopts the modular system structure design of multiple pump groups and multiple main valves. One pump group supplies oil to one main valve, and the number of pump groups and main valves can be freely selected according to system requirements to meet the hydraulic system requirements of super-large mining excavators of different tonnages, and the system has a wide range of applications; the main pump structure design meets the super-large flow requirements of super-large mining excavators, and the configuration number and main pump form of the main pump can be freely selected according to flow requirements; the main valve has a double oil inlet design, and has a strong flow capacity under the same specifications; the two pumps in the same pump group supply oil to the main valve separately through the double oil inlet of the same main valve, instead of supplying oil through one oil inlet after merging, to realize the decoupling between the main pumps in the pump group; the integrated electronically controlled pilot design, each working link is controlled by two proportional solenoid valves integrated on the main valve to control the reversing, and the working links are independent of each other and do not affect each other; the three-position eight-way main valve design realizes that the small flow of the main pump passes through the main valve in the neutral position The valve returns to the oil tank to prevent the main pump from being pressurized and at the same time improve the response speed of the whole machine; the three-position eight-way main valve and the one-way converging design realize that the flow of the two pumps in the same pump group is separately supplied to different working joints in the main valve, so that the compound action is decoupled; the three-position eight-way main valve and the one-way converging design realize that the flow of the two pumps in the same pump group is merged in the main valve and then supplied to a certain working joint, meeting the large flow and fast speed requirements of the corresponding actuator; a group of main valves are provided with working joints of different actuators, and the working joints are controlled independently. Multiple working joints of the same actuator are arranged on multiple main valves, so that the flow of multiple working joints can be merged after the valves into the cylinder, thereby improving the flow level; the same actuator is controlled by multiple working joints arranged on different main valves. One or more of the joints can be selectively controlled to control the oil inlet, and the remaining working joints can control the oil return, so as to realize the decoupling between the oil inlet and return of the same actuator, and the return oil back pressure can be independently adjusted without affecting the oil inlet, thereby improving the smoothness of the action.

[0053] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0054] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0055] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. An independent control hydraulic system for a super-large mining excavator, characterized by: The invention comprises a plurality of pump groups, each of which is connected to a main valve, wherein the main valve is provided with an oil inlet connected to different main pumps in the pump group, and a plurality of working links are provided in the main valve, wherein each main valve has a working link connected to a boom cylinder (12), an arm cylinder (13) and a bucket cylinder (16), and is further provided with a working link connected to a left travel motor (11), an opening and closing bucket cylinder (14), a rotary motor (15) and a right travel motor (17), wherein the left travel motor (11), the opening and closing bucket cylinder (14), the rotary motor (15) and the right travel motor (17) are respectively connected to a working link, and the two control ends of the working link are proportional control ends.

2. The independent control hydraulic system for a super-large mining excavator according to claim 1, characterized in that: There are four pump groups, namely pump group I (1), pump group II (2), pump group III (3) and pump group IV (4). Pump group I (1), pump group II (2), pump group III (3) and pump group IV (4) are respectively connected to main valve I (7), main valve II (8), main valve III (9) and main valve IV (10).

3. The independent control hydraulic system for a super-large mining excavator according to claim 2, characterized in that: Two main pumps are respectively provided in the pump group I (1), pump group II (2), pump group III (3) and pump group IV (4), and two independent oil inlets are provided on the main valve I (7), main valve II (8), main valve III (9) and main valve IV (10).

4. The independent control hydraulic system for a super-large mining excavator according to claim 3, characterized in that: The main valve I (7) is provided with four working links, namely a left travel link (701) connected to the left travel motor (11), a bucket arm link (702) connected to the bucket cylinder (13), a bucket link (703) connected to the bucket cylinder (16), and a boom link (704) connected to the boom cylinder (12). The pump group I (1) includes a main pump I (101) and a main pump II (102). The main pump I (101) is connected to the left travel link (701) and the bucket arm link (13) through a one-way valve. The oil inlet end of the main pump II (102) is connected together with the oil inlet end of the bucket 1 unit (703) and the boom 1 unit (704) through a one-way valve. The main pump I (101) is connected to the oil supply line of the main pump II (102) through the left walking unit (701), the bucket arm 1 unit (702) and the one-way valve. The main pump II (102) is connected to the oil supply line of the main pump I (101) through the bucket 1 unit (703), the boom 1 unit (704) and the one-way valve.

5. The independent control hydraulic system for a super-large mining excavator according to claim 3, characterized in that: The main valve II (8) is provided with four working links, namely, an opening and closing bucket link (801) connected to the opening and closing bucket cylinder (14), a dipper arm 2 link (802) connected to the dipper arm cylinder (13), a bucket 2 link (803) connected to the bucket cylinder (16), and a boom 2 link (804) connected to the boom cylinder (12). The pump group II (2) includes a main pump III (201) and a main pump IV (202). The main pump III (201) is connected to the opening and closing bucket link (801) and the dipper arm 2 link through a one-way valve. The oil inlet end of the main pump Ⅳ (202) is connected together, the oil inlet end of the bucket 2 unit (803) and the boom 2 unit (804) is connected together through a one-way valve, the main pump Ⅲ (201) is connected to the oil supply pipeline of the main pump Ⅳ (202) through the opening and closing bucket unit (801), the boom 2 unit (802) and the one-way valve, and the main pump Ⅳ (202) is connected to the oil supply pipeline of the main pump Ⅲ (201) through the bucket 2 unit (803), the boom 2 unit (804) and the one-way valve.

6. The independent control hydraulic system for a super-large mining excavator according to claim 3, characterized in that: The main valve III (9) is provided with three working links, namely, a boom 3 link (901) connected to the boom cylinder (12), a slewing link (902) connected to the slewing motor (15), and a boom / bucket link (903) connected to the boom cylinder (13) and the bucket cylinder (16). The boom / bucket link (903) is connected to the rodless chamber of the boom cylinder (13) and the bucket cylinder (16). The pump group III (3) includes a main pump V (301) and a main pump VI (302). The main pump V (3 01) is connected to the oil inlet end of the boom 3-way joint (901) through a one-way valve, the main pump VI (302) is connected to the oil inlet end of the rotary joint (902) and the arm / bucket joint (903) through a one-way valve, the main pump V (301) is connected to the oil supply line of the main pump VI (302) through the boom 3-way joint (901) and the one-way valve, and the main pump VI (302) is connected to the oil supply line of the main pump V (301) through the rotary joint (902), the arm / bucket joint (903) and the one-way valve.

7. The independent control hydraulic system for a super-large mining excavator according to claim 3, characterized in that: The main valve IV (10) is provided with four working links, namely, a right travel link (1001) connected to the right travel motor (17), a bucket 4 link (1002) connected to the bucket oil cylinder (16), a boom 4 link (1003) connected to the boom oil cylinder (12), and a dipper arm 4 link (1004) connected to the dipper arm oil cylinder (13). The pump group IV (4) includes a main pump VII (401) and a main pump VIII (402). The main pump VII (401) is connected to the right travel link (1001) and the bucket 4 link (1002) through a one-way valve. 1002), the oil inlet end of the main pump VIII (402) is connected together with the oil inlet end of the boom 4-link (1003) and the bucket 4-link (1004) through a one-way valve, the main pump VII (401) is connected to the oil supply pipeline of the main pump VIII (402) through the right walking link (1001), the bucket 4-link (1002) and the one-way valve, and the main pump VIII (402) is connected to the oil supply pipeline of the main pump VII (401) through the boom 4-link (1003), the bucket 4-link (1004) and the one-way valve.

8. The independent control hydraulic system for a super-large mining excavator according to claim 3, characterized in that: The working link is a three-position eight-way electromagnetic proportional reversing valve.

9. The independent control hydraulic system for a super-large mining excavator according to claim 3, characterized in that: The working link is a three-position eight-way hydraulically controlled directional valve, and both ends of the working link are connected to proportional solenoid valves. The working link also includes a pilot pump (5), and the proportional solenoid valve is supplied with oil through the pilot pump (5).

10. A method for independently controlling a hydraulic system of a super-large mining excavator using the method of claim 1, characterized in that: The working link is controlled by the controller to switch the working position and adjust the flow rate of the working position: During a single action, the controller controls all the working joints connected to the actuator, controls the number of working joints related to the action, and matches the appropriate flow and working joint opening amount according to the required speed of the cylinder and motor; During compound actions, the controller controls the working links connected to the compound action actuators, controls the number of working links related to the actions added to the work, and the positions of the main valves of the working links added to the work, and matches the appropriate flow and working link opening amount according to the required speed of the cylinder and motor; The actuators include a left travel motor (11), a boom cylinder (12), a dipper arm cylinder (13), a bucket opening and closing cylinder (14), a rotary motor (15), a bucket cylinder (16), and a right travel motor (17).

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