CN202017674U

CN202017674U - Load feedback large-flow plug-in multi-way reversing valve group

Info

Publication number: CN202017674U
Application number: CN2011201279818U
Authority: CN
Inventors: 王振华; 于良振; 张喜全; 张春光; 王景海
Original assignee: SHANDONG TAIFENG HYDRAULIC CO Ltd
Current assignee: SHANDONG TAIFENG HYDRAULIC CO Ltd
Priority date: 2011-04-27
Filing date: 2011-04-27
Publication date: 2011-10-26
Anticipated expiration: 2021-04-27

Abstract

The utility model relates to a load feedback large-flow plug-in type multi-way reversing valve group, particularly to construction machinery equipment of a load feedback large-flow plug-in type multi-way reversing valve group. The load feedback large-flow plug-in type multi-way reversing valve group includes a pump control valve group, pilot control valve groups and float control function valve groups, wherein a hydraulic control system adopts a fixed displacement pump or a variable displacement pump; one oil cylinder is controlled by each pilot control valve group; and one cylinder is controlled by each float control function valve group; four cartridge valves, four pilot valves, two overload protection valves and two retaining valves are arranged in each pilot control valve group; and four cartridge valves, four pilot valves, two overload protection valves, four retaining valves and one electromagnetic directional valve are arranged in each float control function valve group. The large-flow construction machinery hydraulic multi-way reversing valve group has the effects that the structure is simple, as the cartridge valves are adopted, the dimension and the volume are small, the operation control is accurate, simple and convenient, and the operation is stable and reliable; and the reversing valve group has no leakage, high efficiency, reduced equipment construction cost and high integration level, saves energy consumption and can be widely used in bulldozers.

Description

The big flow plug-in type of load feedback multiple directional control valve group

Technical field

The present invention relates to the big flow plug-in type of the big flow plug-in type of a kind of load feedback multiple directional control valve group, particularly load feedback multiple directional control valve group engineering mechanical device.

Background technique

At present, what used multiple directional control valve all adopted in the engineering machinery is that valve core of the spool valve adds the structure of casting valve body, owing to be subjected to the influence of system pressure and body strength restriction, 12 millimeters latus rectums of its latus rectum maximum application to two, can not break through the flow of 25 millimeters latus rectums always, adopt above structure promptly to enable to reach, cost is also quite expensive, the user can not accept, so till now, domesticly can not produce high-power always, the engineering machinery of big flow, for example: 500 horsepowers of bulldozers are as using above structure, its pressure loss reaches 30 kilograms, the energy consumption height, and external form is bulky, and it is bigger to take up room, while control section complex structure, the rate of fault height leaks seriously, and action is unstable, impact greatly the operation and maintenance inconvenience.

Summary of the invention

Purpose of the present invention provides the big flow plug-in type of a kind of load feedback multiple directional control valve group, and it is to adopt cartridge valve to combine with the integrated hydraulic control system, actuator in the Control Engineering machinery solves pressure loss height, the energy consumption height, complex structure, the rate of fault height leaks seriously, and action is unstable, impact big, it is bigger to take up room, and the problem of operation and maintenance inconvenience is implemented in particularly bulldozer high-volume hydraulic control system field application aims of engineering machinery.

The big flow plug-in type of load feedback of the present invention multiple directional control valve group takes following technological scheme to realize: it is to be made of pump control valve group, pilot-actuated valve group and the control duty valve group of floating, hydraulic control system adopts metering pump or variable displacement pump, oil cylinder of each group pilot-actuated valve group control, each group is floated and is controlled oil cylinder of duty valve group control, is provided with four cartridge valves, four pilot valves, two overload protection valves and two one-way valves in the pilot-actuated valve group; Be provided with four cartridge valves, four pilot valves, two overload protection valves, four one-way valves and a solenoid directional control valve in the control duty valve group of floating.The pump control valve group that adopts metering pump is by metering pump, filler opening, oil outlet, the number one pilot control opening, damper, the plug-in mounting pressure valve, precursor overflow valve and external control precursor overflow valve constitute, delivery side of pump is communicated with filler opening, filler opening is communicated with plug-in mounting pressure valve one end, plug-in mounting pressure valve one end is communicated with oil outlet, plug-in mounting pressure valve one end is communicated with an end of precursor overflow valve and external control precursor overflow valve, the other end of precursor overflow valve is communicated with oil outlet, one end of external control precursor overflow valve is communicated with the number one pilot control opening, damper one end is communicated with the number one pilot control opening, and the damper the other end is communicated with oil outlet.The pump control valve group that adopts variable displacement pump is by variable displacement pump, filler opening, oil outlet, the number one pilot control opening, damper, the plug-in mounting pressure valve, precursor overflow valve and external control precursor overflow valve constitute, delivery side of pump is communicated with filler opening, filler opening is communicated with plug-in mounting pressure valve one end, plug-in mounting pressure valve one end is communicated with oil outlet, plug-in mounting pressure valve one end is communicated with precursor overflow valve and external control precursor overflow valve, the other end of precursor overflow valve is communicated with oil outlet, one end of external control precursor overflow valve is communicated with the number one pilot control opening, damper one end is communicated with the number one pilot control opening, the damper the other end is communicated with oil outlet, and the number one pilot control opening is communicated with variable displacement pump.The pilot-actuated valve group is by the number one cartridge valve, No. second cartridge valve, No. seven cartridge valve, No. eight cartridge valve, the number one pilot valve, No. second pilot valve, No. seven pilot valve, No. eight pilot valve, the number one cylinder ports, No. second cylinder ports, No. second pilot control opening, No. three pilot control opening, number one one-way valve and No. six one-way valve are formed, filler opening is communicated with number one cartridge valve one end, filler opening is communicated with No. eight cartridge valve one end, No. eight cartridge valve one end is communicated with No. seven cartridge valve one end, No. eight cartridge valve one end is communicated with No. second cylinder ports, number one cartridge valve one end is communicated with No. second cartridge valve one end, number one cartridge valve one end is communicated with the number one cylinder ports, No. second cartridge valve one end is communicated with oil outlet, No. seven cartridge valve one end is communicated with oil outlet, No. eight cartridge valve one end is communicated with No. eight pilot valve, number one pilot valve one end is communicated with the number one cartridge valve, number one pilot valve one end is communicated with No. second pilot control opening, number one pilot valve one end is communicated with the number one cylinder ports, number one pilot valve one end is communicated with oil outlet, number one pilot valve one end is communicated with the number one one-way valve, No. eight pilot valve one end is communicated with No. eight cartridge valve, No. eight pilot valve one end is communicated with No. three pilot control opening, No. eight pilot valve one end is communicated with No. second cylinder ports, No. eight pilot valve one end is communicated with oil outlet, No. eight pilot valve one end is communicated with No. six one-way valve, No. second pilot valve one end is communicated with No. second cartridge valve, No. second pilot valve one end is communicated with first overload valve, No. second pilot valve one end is communicated with No. three pilot control opening, No. second pilot valve one end is communicated with oil outlet, number one overload valve one end is communicated with oil outlet, No. seven pilot valve one end is communicated with No. seven cartridge valve, No. seven pilot valve one end is communicated with the 4th overload valve, No. seven pilot valve one end is communicated with No. second pilot control opening, No. seven pilot valve one end is communicated with oil outlet, No. four overload valve one end is communicated with oil outlet, number one one-way valve one end is communicated with the number one pilot control opening, and No. six one-way valve one end is communicated with the number one pilot control opening.

Float control duty valve group by No. three cartridge valve, No. four cartridge valve, No. five cartridge valve, No. six cartridge valve, No. three pilot valve, No. four pilot valve, No. five pilot valve, No. six pilot valve, No. three cylinder ports, No. four cylinder ports, No. second one-way valve, No. three one-way valve, No. four one-way valve and No. five one-way valve are formed, filler opening is communicated with No. three cartridge valve one end, filler opening is communicated with No. six cartridge valve one end, No. six cartridge valve one end is communicated with No. five cartridge valve one end, No. six cartridge valve one end is communicated with No. four cylinder ports, No. three cartridge valve one end is communicated with No. four cartridge valve one end, No. three cartridge valve one end is communicated with No. three cylinder ports, No. four cartridge valve one end is communicated with oil outlet, No. five cartridge valve one end is communicated with oil outlet, No. six cartridge valve one end is communicated with No. six pilot valve, No. six cartridge valve one end is communicated with No. four cylinder ports, No. three pilot valve one end is communicated with No. three cartridge valve, No. three pilot valve one end is communicated with No. second pilot control opening, No. three pilot valve one end is communicated with No. three cylinder ports, No. three pilot valve one end is communicated with oil outlet, No. three pilot valve one end is communicated with No. second one-way valve, No. six pilot valve one end is communicated with No. six cartridge valve, No. six pilot valve one end is communicated with No. three pilot control opening, No. six pilot valve one end is communicated with No. four cylinder ports, No. six pilot valve one end is communicated with oil outlet, No. six pilot valve one end is communicated with No. five one-way valve, No. four pilot valve one end is communicated with No. four cartridge valve, No. four pilot valve one end is communicated with No. second overload valve, No. four pilot valve one end is communicated with No. three pilot control opening, No. four pilot valve one end is communicated with oil outlet, No. second overload valve one end is communicated with oil outlet, No. five pilot valve one end is communicated with No. five cartridge valve, No. five pilot valve one end is communicated with No. three overload valve, No. five pilot valve one end is communicated with No. second pilot control opening, No. five pilot valve one end is communicated with oil outlet, No. three overload valve one end is communicated with oil outlet, solenoid directional control valve one end is communicated with No. four cartridge valve, solenoid directional control valve one end is communicated with No. five cartridge valve, solenoid directional control valve one end is communicated with No. three one-way valve, solenoid directional control valve one end is communicated with No. four one-way valve, No. three one-way valve one end is communicated with return opening, and No. four one-way valve one end is communicated with return opening.

The effect of the big flow plug-in type of load feedback of the present invention multiple directional control valve group is simple in structure, adopt cartridge valve, the external form volume is little, operation control is accurately easy, and working stability is reliable, does not have and reveals, have high efficiency and energy efficient, reduce equipment manufacturing cost, the level of integration height is widely used in multiple directional control valve group on the big traffic engineering machinery hydraulic system equipment of bulldozer.

Description of drawings

The big flow plug-in type of load feedback of the present invention multiple directional control valve group will describe in further detail in conjunction with the accompanying drawings.

Fig. 1 is the hydraulic structure schematic representation of the big flow plug-in type of load feedback of the present invention multiple directional control valve group.

Fig. 2 is the hydraulic structure schematic representation of metering pump control valve group of the present invention.

Fig. 3 is the hydraulic structure schematic representation of variable displacement pump control valve group of the present invention.

1— 2— 3— 4— 5— 6— 7— 8— 9— 10— 11— 12— 13— 14— 15— 16— 17— 18— 19— 20— 21— 22— 23— 24— 25— 26— 27— 28—29— 30— 31— 32— 33— 34— 35— 36— 37— 38— 39— 40— 41— 42— 43— 44— 45—。

Embodiment

With reference to Fig. 1,2,3, the big flow plug-in type of load feedback of the present invention multiple directional control valve group, it is to be made of pump control valve group 8, pilot-actuated valve group 9 and the control duty valve group 27 of floating, hydraulic control system adopts metering pump 44 or variable displacement pump 45, oil cylinder of each group pilot-actuated valve group 9 control, each group is floated and is controlled oil cylinder of duty valve group 27 controls, is provided with four cartridge valves, four pilot valves, two overload protection valves and two one-way valves in the pilot-actuated valve group 9; Be provided with four cartridge valves, four pilot valves, two overload protection valves, four one-way valves and a solenoid directional control valve in the control duty valve group 27 of floating.The pump control valve group 8 that adopts metering pump 44 is by metering pump 44, filler opening 1, oil outlet 2, number one pilot control opening 3, damper 4, plug-in mounting pressure valve 5, precursor overflow valve 6 and external control precursor overflow valve 7 constitute, delivery side of pump is communicated with filler opening 1, filler opening 1 is communicated with plug-in mounting pressure valve 5 one ends, plug-in mounting pressure valve 5 one ends are communicated with oil outlet 2, plug-in mounting pressure valve 5 one ends are communicated with an end of precursor overflow valve 6 and external control precursor overflow valve 7, the other end of precursor overflow valve 6 is communicated with oil outlet 2, one end of external control precursor overflow valve 7 is communicated with number one pilot control opening 3, damper 4 one ends are communicated with number one pilot control opening 3, and damper 4 the other ends are communicated with oil outlet 2.The pump control valve group 8 that adopts variable displacement pump 45 is by variable displacement pump 45, filler opening 1, oil outlet 2, number one pilot control opening 3, damper 4, plug-in mounting pressure valve 5, precursor overflow valve 6 and external control precursor overflow valve 7 constitute, delivery side of pump is communicated with filler opening 1, filler opening 1 is communicated with plug-in mounting pressure valve 5 one ends, plug-in mounting pressure valve 5 one ends are communicated with oil outlet 2, plug-in mounting pressure valve 5 one ends are communicated with precursor overflow valve 6 and external control precursor overflow valve, the other end of precursor overflow valve 6 is communicated with oil outlet 2, one end of external control precursor overflow valve 7 is communicated with number one pilot control opening 3, damper 4 one ends are communicated with number one pilot control opening 3, damper 4 the other ends are communicated with oil outlet 2, and number one pilot control opening 3 is communicated with variable displacement pump 45.Pilot-actuated valve group 8 is by number one cartridge valve 13, No. second cartridge valve 16, No. seven cartridge valve 40, No. eight cartridge valve 41, number one pilot valve 11, No. second pilot valve 19, No. seven pilot valve 38, No. eight pilot valve 42, number one cylinder ports 14, No. second cylinder ports 15, No. second pilot control opening 12, No. three pilot control opening 18, number one one-way valve 10 and No. six one-way valve 43 are formed, filler opening 1 is communicated with number one cartridge valve 13 1 ends, filler opening 2 is communicated with No. eight cartridge valve 41 1 ends, No. eight cartridge valve 41 1 ends are communicated with No. seven cartridge valve 40 1 ends, No. eight cartridge valve 41 1 ends are communicated with No. second cylinder ports 15, number one cartridge valve 13 1 ends are communicated with No. second cartridge valve 16 1 ends, number one cartridge valve 13 1 ends are communicated with number one cylinder ports 14, No. second cartridge valve 16 1 ends are communicated with oil outlet 2, No. seven cartridge valve 40 1 ends are communicated with oil outlet 2, No. eight cartridge valve 41 1 ends are communicated with No. eight pilot valve 42, number one pilot valve 11 1 ends are communicated with number one cartridge valve 13, number one pilot valve 11 1 ends are communicated with No. second pilot control opening 12, number one pilot valve 11 1 ends are communicated with number one cylinder ports 14, number one pilot valve 11 1 ends are communicated with oil outlet 2, number one pilot valve 11 1 ends are communicated with number one one-way valve 10, No. eight pilot valve 42 1 ends are communicated with No. eight cartridge valve 41, No. eight pilot valve 42 1 ends are communicated with No. three pilot control opening 18, No. eight pilot valve 42 1 ends are communicated with No. second cylinder ports 15, No. eight pilot valve 42 1 ends are communicated with oil outlet 2, No. eight pilot valve 42 1 ends are communicated with No. six one-way valve 43, No. second pilot valve 19 1 ends are communicated with No. second cartridge valve 16, No. second pilot valve 19 1 ends are communicated with first overload valve 17, No. second pilot valve 19 1 ends are communicated with No. three pilot control opening 18, No. second pilot valve 19 1 ends are communicated with oil outlet 2, number one overload valve 17 1 ends are communicated with oil outlet 2, No. seven pilot valve 38 1 ends are communicated with No. seven cartridge valve 40, No. seven pilot valve 38 1 ends are communicated with the 4th overload valve 39, No. seven pilot valve 38 1 ends are communicated with No. second pilot control opening 12, No. seven pilot valve 38 1 ends are communicated with oil outlet 2, No. four overload valve 39 1 ends are communicated with oil outlet 2, number one one-way valve 10 1 ends are communicated with number one pilot control opening 3, and No. six one-way valve 43 1 ends are communicated with number one pilot control opening 3.

Float control duty valve group 27 by No. three cartridge valve 24, No. four cartridge valve 25, No. five cartridge valve 34, No. six cartridge valve 35, No. three pilot valve 21, No. four pilot valve 26, No. five pilot valve 29, No. six pilot valve 36, No. three cylinder ports 22, No. four cylinder ports 23, No. second one-way valve 20, No. three one-way valve 32, No. four one-way valve 33 and No. five one-way valve 37 are formed, filler opening 1 is communicated with No. three cartridge valve 24 1 ends, filler opening 2 is communicated with No. six cartridge valve 35 1 ends, No. six cartridge valve 35 1 ends are communicated with No. five cartridge valve 34 1 ends, No. six cartridge valve 35 1 ends are communicated with No. four cylinder ports 23, No. three cartridge valve 24 1 ends are communicated with No. four cartridge valve 25 1 ends, No. three cartridge valve 24 1 ends are communicated with No. three cylinder ports 22, No. four cartridge valve 25 1 ends are communicated with oil outlet 2, No. five cartridge valve 34 1 ends are communicated with oil outlet 2, No. six cartridge valve 35 1 ends are communicated with No. six pilot valve 36, No. six cartridge valve 35 1 ends are communicated with No. four cylinder ports 23, No. three pilot valve 21 1 ends are communicated with No. three cartridge valve 24, No. three pilot valve 21 1 ends are communicated with No. second pilot control opening 12, No. three pilot valve 21 1 ends are communicated with No. three cylinder ports 22, No. three pilot valve 21 1 ends are communicated with oil outlet 2, No. three pilot valve 21 1 ends are communicated with No. second one-way valve 20, No. six pilot valve 36 1 ends are communicated with No. six cartridge valve 35, No. six pilot valve 36 1 ends are communicated with No. three pilot control opening 18, No. six pilot valve 36 1 ends are communicated with No. four cylinder ports 23, No. six pilot valve 36 1 ends are communicated with oil outlet 2, No. six pilot valve 36 1 ends are communicated with No. five one-way valve 37, No. four pilot valve 26 1 ends are communicated with No. four cartridge valve 25, No. four pilot valve 26 1 ends are communicated with No. second overload valve 28, No. four pilot valve 26 1 ends are communicated with No. three pilot control opening 18, No. four pilot valve 26 1 ends are communicated with oil outlet 2, No. second overload valve 28 1 ends are communicated with oil outlet 2, No. five pilot valve 29 1 ends are communicated with No. five cartridge valve 34, No. five pilot valve 29 1 ends are communicated with No. three overload valve 30, No. five pilot valve 29 1 ends are communicated with No. second pilot control opening 12, No. five pilot valve 29 1 ends are communicated with oil outlet 2, No. three overload valve 30 1 ends are communicated with oil outlet 2, solenoid directional control valve 31 1 ends are communicated with No. four cartridge valve 25, solenoid directional control valve 31 1 ends are communicated with No. five cartridge valve 34, solenoid directional control valve 31 1 ends are communicated with No. three one-way valve 32, solenoid directional control valve 31 1 ends are communicated with No. four one-way valve 33, No. three one-way valve 32 1 ends are communicated with return opening 2, and No. four one-way valve 33 1 ends are communicated with return opening 2.

The embodiment of the big flow plug-in type of load feedback of the present invention multiple directional control valve group, it is to be made of pump control valve group 8, pilot-actuated valve group 9 and the control duty valve group 27 of floating, needs according to engineering machinery, hydraulic control system adopts metering pump 44 or variable displacement pump 45, oil cylinder of each group pilot-actuated valve group 9 control, each group is floated and is controlled oil cylinder of duty valve group 27 controls, constitutes according to the several pilot-actuated valve groups 9 of the quantity corresponding configuration of oil cylinder or several unsteady control duty valve group 27.Promote with first group of pilot-actuated valve group 9 as the ridge buster oil cylinder in the bulldozer, the ridge buster oil cylinder tilts with second group of pilot-actuated valve group 9, dozer is right to be shoveled with the 3rd group of pilot-actuated valve group 9, dozer left side shovel promotes with one group of control duty valve group 27 of floating with the 4th group of pilot-actuated valve group 9, dozer.Be provided with four cartridge valves, four pilot valves, two overload protection valves and two one-way valves in the pilot-actuated valve group 9; Be provided with four cartridge valves, four pilot valves, two overload protection valves, four one-way valves and a solenoid directional control valve in the control duty valve group 27 of floating, realize the engineering machinery oil cylinder lifting, descending, repairing, float, the function of overload protection.

When adopting metering pump 44, the working principle of pilot-actuated valve group 9: when No. second pilot control opening 12 and No. three pilot control opening 18 did not have pressure, external control precursor overflow valve 7 was in opening state, 5 pressure releases of plug-in mounting pressure valve, and hydraulic control system does not have pressure.When No. second pilot control opening 12 begins pressure is arranged, when pressure overcomes external control precursor overflow valve 7, during the spring of number one pilot valve 11 and No. seven pilot valve 38, external control precursor overflow valve 7, the spool of number one pilot valve 11 and No. seven pilot valve 38 moves, external control precursor overflow valve 7 is tending towards closed condition, the main valve plug of plug-in mounting pressure valve 5 also is tending towards closed condition, hydraulic control system begins that pressure is arranged, the spool of number one pilot valve 11 and No. seven pilot valve 38 moves unlatching, the control chamber pressure oil of number one cartridge valve 13 begins to enter number one cylinder ports 14 and control external control precursor overflow valves 7 by number one one-way valve 10 by the spool of number one pilot valve 11, the spool of number one cartridge valve 13 begins to open, the control chamber pressure oil of No. seven cartridge valve 40 begins to enter return opening 2 by the spool of No. seven pilot valve 38 simultaneously, the spool of No. seven cartridge valve 40 begins to open, the oil that metering pump 44 comes out enters the plug chamber of oil cylinder by number one cartridge valve 13, the oil in cylinder rod chamber enters return opening 2 by No. seven cartridge valve 40 simultaneously, when the pressure of No. second pilot control opening 12 increases gradually, the spool of plug-in mounting pressure valve 5 is closed more, the oil that metering pump 44 comes out is more by the oil that number one cartridge valve 13 enters oil cylinder, so just can improve the motion speed of oil cylinder; When No. three pilot control opening 18 begins pressure is arranged, when pressure overcomes external control precursor overflow valve 7, during the spring of No. second pilot valve 19 and No. eight pilot valve 42, external control precursor overflow valve 7, the spool of No. second pilot valve 19 and No. eight pilot valve 42 moves unlatching, external control precursor overflow valve 7 is tending towards closed condition, the main valve plug of plug-in mounting pressure valve 5 also is tending towards closed condition, system begins that pressure is arranged, the spool of No. second pilot valve 19 and No. eight pilot valve 42 moves unlatching, the control chamber pressure oil of No. eight cartridge valve 41 begins to enter No. second cylinder ports 15 and pass through one-way valve 43 control external control precursor overflow valves 7 No. six by the spool of No. eight pilot valve 42, the spool of No. eight cartridge valve 41 begins to open, the control chamber pressure oil of No. second cartridge valve 16 begins to enter return opening 2 by the spool of No. second pilot valve 19 simultaneously, the spool of No. second cartridge valve 16 begins to open, the oil that metering pump 44 comes out enters the bar chamber of oil cylinder by No. eight cartridge valve 41, the oil in oil cylinder plug chamber enters return opening 2 by No. second cartridge valve 15 simultaneously, when the pressure of No. three pilot control opening 17 increases gradually, the spool of plug-in mounting pressure valve is closed more, the spool open amount of No. eight cartridge valve 41 is more, the oil that metering pump 44 comes out is more by the oil that No. eight cartridge valve 41 enters oil cylinder, so just can improve the motion speed of oil cylinder.

The working principle of the control duty valve group 27 of floating is identical with the working principle of pilot-actuated valve group 9, just many individual float functions, when solenoid directional control valve 31 energisings, the control chamber pressure oil of No. four cartridge valve 25 and No. five cartridge valve 34 enters return opening 2 by solenoid directional control valve 31, No. three one-way valve 32 and No. four one-way valve 33 respectively, at this moment, the spool of No. four cartridge valve 25 and No. five cartridge valve 34 is all opened under the effect of pressure oil.

When adopting variable displacement pump 45, the pressure oil of number one pilot control opening 3 affacts variable displacement pump 45 simultaneously, and the output flow of controlled variable pump 45 reaches the function of controlling oil cylinder speed simultaneously.

Claims

1. the big flow plug-in type of load feedback multiple directional control valve group, it is to be made of pump control valve group (8), pilot-actuated valve group (9) and the control duty valve group (27) of floating, it is characterized in that metering pump (44) or variable displacement pump (45), oil cylinder of each group pilot-actuated valve group (9) control, each group is floated and is controlled oil cylinder of duty valve group (27) control, is provided with four cartridge valves, four pilot valves, two overload protection valves and two one-way valves in the pilot-actuated valve group (9); Be provided with four cartridge valves, four pilot valves, two overload protection valves, four one-way valves and a solenoid directional control valve in the control duty valve group (27) of floating.

2. according to the big flow plug-in type of the described load feedback of claim 1 multiple directional control valve group, the pump control valve group (8) that it is characterized in that metering pump (44) is communicated with filler opening (1) by the outlet of metering pump (44), filler opening (1) is communicated with plug-in mounting pressure valve (5) one ends, plug-in mounting pressure valve (5) one ends are communicated with oil outlet (2), plug-in mounting pressure valve (5) one ends are communicated with an end of precursor overflow valve (6) and external control precursor overflow valve (7), the other end of precursor overflow valve (6) and external control precursor overflow valve (7) is communicated with oil outlet (2), one end of external control precursor overflow valve (7) is communicated with number one pilot control opening (3), damper (4) one ends are communicated with number one pilot control opening (3), and damper (4) the other end is communicated with oil outlet (2).

3. according to the big flow plug-in type of the described load feedback of claim 1 multiple directional control valve group, the pump control valve group (8) that it is characterized in that variable displacement pump (45) is communicated with filler opening (1) by the outlet of variable displacement pump (45), filler opening (1) is communicated with plug-in mounting pressure valve (5) one ends, plug-in mounting pressure valve (5) one ends are communicated with oil outlet (2), plug-in mounting pressure valve (5) one ends are communicated with an end of precursor overflow valve (6) and first external control precursor overflow valve (7), the other end of precursor overflow valve (6) and external control precursor overflow valve (7) is communicated with oil outlet (2), one end of external control precursor overflow valve (7) is communicated with number one pilot control opening (3), number one pilot control opening (3) is communicated with variable displacement pump (45), damper (4) one ends are communicated with number one pilot control opening (3), and damper (4) the other end is communicated with oil outlet (2).

4. according to the big flow plug-in type of the described load feedback of claim 1 multiple directional control valve group, it is characterized in that pilot-actuated valve group (9) is communicated with number one cartridge valve (13) one ends by filler opening (1), filler opening (1) is communicated with No. eight cartridge valve (41) one ends, No. eight cartridge valve (41) one ends are communicated with No. seven cartridge valve (40) one ends, No. eight cartridge valve (41) one ends are communicated with No. second cylinder ports (15), number one cartridge valve (13) one ends are communicated with No. second cartridge valve (16) one ends, number one cartridge valve (13) one ends are communicated with number one cylinder ports (14), No. second cartridge valve (16) one ends are communicated with oil outlet (2), No. seven cartridge valve (40) one ends are communicated with oil outlet (2), No. eight cartridge valve (41) one ends are communicated with No. eight pilot valve (42), No. eight cartridge valve (41) one ends are communicated with No. second cylinder ports (14), number one pilot valve (11) one ends are communicated with number one cartridge valve (13), number one pilot valve (11) one ends are communicated with No. second pilot control opening (12), number one pilot valve (11) one ends are communicated with number one cylinder ports (14), number one pilot valve (11) one ends are communicated with oil outlet (2), number one pilot valve (11) one ends are communicated with number one one-way valve (10), No. eight pilot valve (42) one ends are communicated with No. eight cartridge valve (41), No. eight pilot valve (42) one ends are communicated with No. three pilot control opening (18), No. eight pilot valve (42) one ends are communicated with No. second cylinder ports (15), No. eight pilot valve (42) one ends are communicated with oil outlet (2), No. eight pilot valve (42) one ends are communicated with No. six one-way valve (43), No. second pilot valve (19) one ends are communicated with No. second cartridge valve (16), No. second pilot valve (19) one ends are communicated with first overload valve (17), No. second pilot valve (19) one ends are communicated with No. three pilot control opening (18), No. second pilot valve (19) one ends are communicated with oil outlet (2), number one overload valve (17) one ends are communicated with oil outlet (2), No. seven pilot valve (38) one ends are communicated with No. seven cartridge valve (40), No. seven pilot valve (38) one ends are communicated with the 4th overload valve (39), No. seven pilot valve (38) one ends are communicated with No. second pilot control opening (12), No. seven pilot valve (38) one ends are communicated with oil outlet (2), No. four overload valve (39) one ends are communicated with oil outlet (2), number one one-way valve (10) one ends are communicated with number one pilot control opening (3), and No. six one-way valve (43) one ends are communicated with number one pilot control opening (3).

5. according to the big flow plug-in type of the described load feedback of claim 1 multiple directional control valve group, the control duty valve group (27) that it is characterized in that floating is communicated with No. three cartridge valve (24) one ends by filler opening (1), filler opening (1) is communicated with No. six cartridge valve (35) one ends, No. six cartridge valve (35) one ends are communicated with No. five cartridge valve (34) one ends, No. six cartridge valve (35) one ends are communicated with No. four cylinder ports (23), No. three cartridge valve (24) one ends are communicated with No. four cartridge valve (25) one ends, No. three cartridge valve (24) one ends are communicated with No. three cylinder ports (22), No. four cartridge valve (25) one ends are communicated with oil outlet (2), No. five cartridge valve (34) one ends are communicated with oil outlet (2), No. six cartridge valve (35) one ends are communicated with No. six pilot valve (36), No. six cartridge valve (35) one ends are communicated with No. four cylinder ports (23), No. three pilot valve (21) one ends are communicated with No. three cartridge valve (24), No. three pilot valve (21) one ends are communicated with No. second pilot control opening (12), No. three pilot valve (21) one ends are communicated with No. three cylinder ports (22), No. three pilot valve (21) one ends are communicated with oil outlet (2), No. six pilot valve (36) one No. six cartridge valves of end (35) are communicated with, No. six pilot valve (36) one ends are communicated with No. three pilot control opening (18), No. six pilot valve (36) one ends are communicated with No. four cylinder ports (23), No. six pilot valve (36) one ends are communicated with oil outlet (2), No. four pilot valve (26) one ends are communicated with No. four cartridge valve (25), No. four pilot valve (26) one ends are communicated with No. second overload valve (28), No. four pilot valve (26) one ends are communicated with No. three pilot control opening (18), No. four pilot valve (26) one ends are communicated with oil outlet (2), No. second overload valve (28) one ends are communicated with oil outlet (2), No. five pilot valve (29) one ends are communicated with No. five cartridge valve (34), No. five pilot valve (29) one ends are communicated with No. three overload valve (30), No. five pilot valve (29) one ends are communicated with No. second pilot control opening (12), No. five pilot valve (29) one ends are communicated with oil outlet (2), No. three overload valve (30) one ends are communicated with oil outlet (2), No. second one-way valve (20) one ends are communicated with number one pilot control opening (3), No. three one-way valve (37) one ends are communicated with number one pilot control opening (3), solenoid directional control valve (31) one ends are communicated with No. four cartridge valve (25), solenoid directional control valve (31) one ends are communicated with No. five cartridge valve (34), No. three one-way valve (32) one ends are communicated with return opening (2), and No. four one-way valve (32) one ends are communicated with return opening (2).