CN204590113U - Medium-sized multi-way valve of hydraulic excavator group - Google Patents
Medium-sized multi-way valve of hydraulic excavator group Download PDFInfo
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- CN204590113U CN204590113U CN201520245787.8U CN201520245787U CN204590113U CN 204590113 U CN204590113 U CN 204590113U CN 201520245787 U CN201520245787 U CN 201520245787U CN 204590113 U CN204590113 U CN 204590113U
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Abstract
A banked direction control valves group for medium-sized hydraulic crawler excavator, comprises main valve and guide's shuttle valve group.The distinguishing feature that the banked direction control valves group of medium-sized hydraulic crawler excavator has is: 1, rated pressure 350bar, metered flow 320L/min, be common to the hydraulic crawler excavator of 20T ~ 30T level; 2, working connection and guide's oil circuit are absolute construction, can realize positive flow and control or inverted flux control; 3, dipper adduction holomorphosis, amount of regeneration is large, and dipper adduction speed is fast; 4, swing arm decline relies on regeneration repairing completely, does not need pump initiatively fuel feeding; 5, dipper and scraper bowl composite move, when dipper overflow, the flow of pump can supply scraper bowl; 6, revolution and swing arm promote composite move, can carry out assignment of traffic by actual loading; 7, dipper adduction is put outward as collaborating after double pump valve, and the pressure loss is little; 8, dipper first control valve, dipper second control valve, bucket are provided with ratio pressure-gradient control valve on hydraulic circuit, and the flow that can realize as required accurately controls.
Description
Technical field
The utility model relates to a kind of control loop of medium-sized hydraulic excavator hydraulic system, and the versatility particularly relating to a kind of medium-sized hydraulic crawler excavator is good, control mode is flexible, energy-efficient, handling excellent hydraulic multitandem valve group.
Background technology
Hydraulic crawler excavator, is a kind of earthwork construction machinery of extensive use, as the main control valve group of its key control unit, is the integrated hydraulic multichannel control valve of function height, which determines control mode and the transaction capabilities of excavator hydraulic system.Dig hydraulic circuit in the market in main flow and mainly contain inverted flux control hydraulic system, positive flow hydraulic control system and load-sensitive hydraulic system three kind, inverted flux control hydraulic system and positive flow hydraulic control system, through market checking for many years, develop comparatively ripe, but traditional positive flow hydraulic control banked direction control valves and inverted flux control hydraulic multitandem valve have obvious difference, mutually can not be general, it depends mainly on the structure of banked direction control valves, and the range of application that same banked direction control valves is had is restricted greatly.In addition, medium-sized hydraulic crawler excavator in the market, mainly with 20T level, 30T level etc. carries out classification, and the banked direction control valves matched with it also form multiple kind, considerably increases cost of production, is unfavorable for batch production.
Current medium-sized multi-way valve of hydraulic excavator, dipper action control loop generally adopts interflow form before double pump valve, behind the hydraulic oil interflow of double pump, again after the spool of dipper first control valve controls, enter bucket arm cylinder, and for banked direction control valves, the pressure loss that its internal main is wanted is reduced in valve port place, when therefore causing dipper adduction to be put outward, the loss of banked direction control valves internal pressure significantly increases, and adds energy loss.General medium-sized multi-way valve of hydraulic excavator, during for accelerating underload, dipper responsiveness, when the time receiving in dipper, dipper first control valve valve core inside has regenerative circuit, but due to the restriction of recovery passage, the oil return of dipper loculus can only be partially recycled to the large chamber of dipper, the speed of dipper adduction must be restricted, and affects the operating efficiency of excavator.When dipper and scraper bowl composite move, control because bucket is generally single spool, to be shared the flow of the second pump by parallel port with dipper second control valve, and the hydraulic oil of the first pump is when dipper overflow, flow by overflow, thus makes system temperature raise, and energy consumption increases.And swing arm decline is controlled, current medium-sized multi-way valve of hydraulic excavator, swing arm first control valve is generally adopted to control, initiatively fuel feeding is to swing arm loculus for hydraulic pump, and drive swing arm to decline, the oil return partial regeneration in the large chamber of swing arm is to swing arm loculus, like this, the potential energy that swing arm declines is not fully exploited, and also needs the energy consuming hydraulic system, have impact on the operating speed of other equipments during composite move.
When excavator composite move, the real work load of equipment has larger difference, the inevitable first action of equipment first driving load little of hydraulic oil from same hydraulic pump, in order to enable each equipment action simultaneously of composite move, general medium-sized multi-way valve of hydraulic excavator is at rotary control valve, swing arm first control valve, dipper first control valve, dipper second control valve, on bucket in-line, add fixed pressure-gradient control valve, improve composite move performance, but due to the difference of actual condition, this fixed pressure-gradient control valve can not the change of adaptation condition, therefore, cause excavator under the working condition different from desirable operating mode, handling and operating speed obviously declines.
Utility model content
The purpose of this utility model is the deficiency for existing medium-sized multi-way valve of hydraulic excavator, provides a kind of versatility good, handling excellent, the medium-sized multi-way valve of hydraulic excavator group with obvious efficient energy-saving feature.
The technical solution adopted in the utility model is:
A kind of medium-sized multi-way valve of hydraulic excavator group, comprising: main valve and guide's shuttle valve group.Main valve comprises the first control loop and the second control loop.First control loop, forms primarily of left travel control valves V1, rotary control valve V2, swing arm second control valve V3, dipper first control valve V4, aux. control valve V5, the first bypass cut-out converging valve V6, first flow control valve V7; Second control loop, forms primarily of straight line moving control valve V8, right travel control valve V9, swing arm first control valve V10, dipper second control valve V11, bucket V12, the second bypass cut-out converging valve V13, second control valve V14.Guide's shuttle valve group is mainly used in straight line moving signals collecting.
Its spool latus rectum is 30mm, and rated pressure is 350bar, metered flow 320L/min, is common to the hydraulic crawler excavator of 20T ~ 30T level.
First flow control valve V7 and second control valve V14 is modular unit, by instructions for use, can be equipped with positive flow control valve or inverted flux control valve.When being equipped with positive flow control valve, this medium-sized multi-way valve of hydraulic excavator group is positive flow control system, and when being equipped with inverted flux control valve, this medium-sized multi-way valve of hydraulic excavator group is inverted flux control system.
According to the medium-sized multi-way valve of hydraulic excavator group described in claim one, its first control loop has external channel 12 and external channel 13, when making dipper and scraper bowl composite move, when dipper overflow, the flow of the first pump P1 gives bucket V12 fuel feeding by this external channel 12 and external channel 13, reduces hydraulic system energy consumption.
The operating valve connection of the first control loop and the second control loop is arranged according to excavator real work condition of loading, the little operating valve townhouse of load is in the downstream of hydraulic circuit, thus the pressure loss of banked direction control valves inner flow passage is reduced on the less operating valve connection in-line of load during composite move, when being conducive to composite move, reduce hydraulic system energy consumption.
Its dipper first control valve V4 has holomorphosis loop, when dipper adduction load pressure does not reach the setting pressure of regeneration relief valve 6, the large chamber of dipper is got back in regeneration one way valve 5 holomorphosis of oil return on multi-way valve body of dipper loculus, and dipper adduction speed is accelerated; When dipper adduction load pressure reaches the setting pressure of regeneration relief valve 6, regeneration function is removed.
When its swing arm declines, swing arm second control valve V3 is in left position, the hydraulic oil partial regeneration in the large chamber of swing arm is to swing arm loculus, by controlling the PT open area of swing arm first control valve V10, realize swing arm to decline other equipments of the second pump P2 not initiatively fuel feeding, the hydraulic oil supply composite move of P2 pump; During swing arm decent car, being in right position by controlling the second bypass transfer valve V13, cutting off the put-through channel 4 of the second pump P2, realize a car function.
The junction of two streams that its dipper adduction puts the first pump P1 and the second pump P2 is outward positioned at the hydraulic circuit downstream of dipper first control valve V4 and dipper first control valve V11, for collaborating after valve, reduces the loss of banked direction control valves internal pressure.
The in-line of rotary control valve V2 is provided with fixing pressure-gradient control valve 10, and swing arm second control valve V3 in-line is provided with fixing pressure-gradient control valve 11, according to actual condition, can carry out assignment of traffic, accelerates to put forward revolution of arm composite move speed.
Its dipper first control valve V4 is provided with ratio pressure-gradient control valve 7 on hydraulic circuit in-line, dipper second control valve V11 is provided with ratio pressure-gradient control valve 8 on hydraulic circuit in-line, bucket V12 is provided with ratio pressure-gradient control valve 9 on hydraulic circuit in-line, can realize according to given input signal, distribute the flow of hydraulic pump, improve the speed of digger operating device composite move and improve handling.
Compared with prior art, the beneficial effect had is the utility model:
1, versatility is good.Medium-sized multi-way valve of hydraulic excavator group of the present utility model can be general in 20T ~ 30T excavator, is conducive to reducing cost of production.
2, control mode is flexible.Apply hydraulic crawler excavator of the present utility model and according to instructions for use, positive flow control mode or inverted flux control mode can be realized.
3, energy-conservation, efficient.Dipper adduction is collaborated after putting double pump valve outward, and the pressure loss is little; The holomorphosis of dipper adduction, operating speed is fast; Swing arm decline hydraulic pump not initiatively fuel feeding, during composite move, the valve inner flow passage pressure loss is reduced on the little operating valve connection in-line of load, and when dipper overflow, the flow of hydraulic pump can supply scraper bowl, good energy-conserving effect.
4, handling good.During excavator composite move, coordinate electric-control system to realize ratio priority acccess control according to each requirement of actual working condition, have more excellent handling.
Accompanying drawing explanation
Fig. 1 is main valve schematic diagram of the present utility model;
Fig. 2 is dipper adduction holomorphosis circuit theory figure of the present utility model;
Fig. 3 is swing arm control loop for descending schematic diagram of the present utility model;
Fig. 4 is dipper of the present utility model and scraper bowl composite move control loop schematic diagram;
Fig. 5 is that swing arm of the present utility model promotes and upper-part rotation composite move control loop schematic diagram;
Fig. 6 is guide's shuttle valve group schematic diagram of the present utility model.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Multi-way valve of hydraulic excavator type spectrum is as follows:
According to this type spectrum, the general banked direction control valves group of excavator of 20T ~ 30T rank, its spool latus rectum is 30mm, and rated pressure is 350bar, and metered flow is 320L/min, meets the excavator performance indications requirement of this rank completely.
The specific embodiment of medium-sized multi-way valve of hydraulic excavator group main valve of the present utility model is see accompanying drawing 1.Main valve comprises the first control loop and the second control loop.During excavator real work, generally, due to own wt and position of articulating point relation, swing arm, dipper, the operating pressure size order of bucket cylinder and rotary motor oil-in is: revolution > swing arm > dipper > scraper bowl, medium-sized multi-way valve of hydraulic excavator group main valve first control loop of the present utility model is by left travel control valves V1, rotary control valve V2, swing arm second control valve V3, dipper first control valve V4, aux. control valve V5, first bypass cutting-off controlling valve V6, first flow control valve V7 forms, second control loop is made up of straight line moving valve V8, right travel control valve V9, swing arm first control valve V10, dipper second control valve V11, bucket V12, the second bypass cutting-off controlling valve V13, second control valve V14, the control valve that in above-mentioned first control loop and the second control loop, load is less and work probability is not high is arranged in the downstream of hydraulic circuit, make the pressure loss of hydraulic circuit be reduced on the less hydraulic actuator of load, the energy consumption of hydraulic system will effectively be reduced.In this embodiment, first flow control valve V7 and second control valve V14 is inverted flux control valve, and by detecting ps1 mouth pressure and ps2 mouth pressure, hydraulic control pump delivery changes, and makes excavator hydraulic system realize inverted flux control, reaches energy-saving effect.
In the present embodiment, dipper control loop is by dipper first control valve V4 and dipper second control valve V11 co-controlling, see accompanying drawing 2, during the action of dipper adduction, from the hydraulic oil of the first pump P1 through the first control loop oil supply gallery 1 in parallel or straight-through oil supply gallery 2, enter the large chamber of dipper through the left position of dipper first control valve V4; From the hydraulic oil of the second pump P2 through the second control loop parallel port 3 or straight-through oil supply gallery 4, enter the large chamber of dipper through the right position of dipper second control valve V11.The oil return of dipper loculus is behind the left position of dipper first control valve V4, all enter regeneration one way valve 5, the load hour of dipper adduction, dipper regeneration relief valve 6 is in neutral position, from whole hydraulic oil of regeneration one way valve 5 and after collaborating from the hydraulic oil of the first pump P1, again by the left position of dipper first control valve V4, enter the large chamber of dipper, realize holomorphosis.When the load of dipper adduction is large, dipper regeneration relief valve 6 is in left position, and the oil return of regeneration relief valve 6 is passed through in the oil return from dipper loculus, and regeneration function is removed.In described dipper adduction control loop, from the hydraulic oil of the first pump P1 after dipper first control valve V4, collaborate after dipper second control valve V11 with the hydraulic oil from the second pump P2, for collaborating after valve, valve internal pressure loss is little, equally, dipper puts control loop outward is also collaborate after double pump valve.
In the present embodiment, swing arm control loop is by swing arm first control valve V10 and swing arm second control valve V3 co-controlling, see accompanying drawing 3, when swing arm zero load declines, the a part of left position recovery passage through swing arm second control valve V3 of oil return in the large chamber of swing arm, regeneration is to swing arm loculus, and unnecessary hydraulic oil is by the right position oil return of swing arm first control valve V10.By mating the right position PT open area of rational swing arm first control valve V10, from the hydraulic oil of the second pump P2, oil supply gallery 4 is led directly to through the second control loop, straight-through oil supply gallery 4 oil return of the right position of swing arm first control valve V10, hydraulic control pumpage is minimum, thus realize the second pump P2 not initiatively fuel feeding when swing arm declines, rely on swing arm self gravitation to decline completely.During swing arm decent car, pilot pressure signal acts on the control port pa2 of the second bypass cutting-off controlling valve V13, close the second control loop and lead directly to oil supply gallery 4, make the hydraulic oil of the second pump P2 initiatively enter swing arm loculus through the second control loop oil supply gallery 3 in parallel, drive swing arm to prop up car.
In the present embodiment, dipper and scraper bowl composite move control loop are see accompanying drawing 4, from the hydraulic oil of the first pump P1 through the first control loop oil supply gallery 1 in parallel or straight-through oil supply gallery 2, to dipper first control valve V4 fuel feeding, hydraulic oil from the second pump P2 gives dipper second control valve V11 fuel feeding through the second control loop oil supply gallery 3 in parallel or straight-through oil supply gallery 4, and give bucket V12 fuel feeding by the second control loop oil supply gallery 3 in parallel, when dipper overflow, by controlling the first control loop external channel 12 and external channel 13 is connected, and apply signal pressure in pa1, the first bypass switching control valve V6 is made to be in left position, from the hydraulic oil of the first pump P1, bucket V12 will be entered through external channel 12 and external channel 13, prevent spill losses.
See accompanying drawing 1, in the present embodiment, the dipper first control valve V4 parallel port in-line of main valve is provided with ratio pressure-gradient control valve 7, dipper second control valve V11 parallel port in-line is provided with ratio pressure-gradient control valve 8, the parallel port in-line of bucket V12 is provided with ratio pressure-gradient control valve 9, by the aperture area of the value control ratio pressure-gradient control valve 7 of control signal pressure p i3, the aperture area of the value control ratio pressure-gradient control valve 8 of control signal pressure p i4, the aperture area of the value control ratio pressure-gradient control valve 9 of control signal pressure p i5, flow from the first pump P1 and the second pump P2 can more reasonably distribute to each equipment.
In the present embodiment, swing arm promotes and turns round composite move control loop see accompanying drawing 5, hydraulic oil from the second pump P2 supplies swing arm first control valve V10 by the second control loop oil supply gallery 3 in parallel is independent, and the hydraulic oil from the first pump P1 supplies rotary control valve V2 and swing arm second control valve V3 by the first control loop oil supply gallery 1 in parallel simultaneously.Rotary control valve V2 parallel port in-line is provided with fixing pressure-gradient control valve 10, swing arm second control valve V3 parallel port in-line is provided with fixing pressure-gradient control valve 11, because excavator is when carrying revolution of arm composite move, during high speed, often need revolution preferential, and during low speed, then swing arm promotes and needs preferentially, above-mentioned pressure-gradient control valve 10 and pressure-gradient control valve 11, can by different cooperations, realize the needs of excavator according to operator, carry out harmony control, ensure the handling and operating speed of excavator.
The specific embodiment of medium-sized multi-way valve of hydraulic excavator group guide shuttle valve group of the present utility model is see accompanying drawing 6.Guide's shuttle valve group is independently low pressure valve group, for realizing signals collecting during excavator straight line moving.
Claims (10)
1. the banked direction control valves group of medium-sized hydraulic crawler excavator, it is characterized in that: comprise main valve and guide's shuttle valve group, main valve comprises the first control loop and the second control loop, and the first control loop comprises the first pump P1, left travel control valves (V1), rotary control valve (V2), swing arm second control valve (V3), dipper first control valve (V4), aux. control valve (V5), the first bypass cut-out converging valve (V6) and first flow control valve (V7); Second control loop comprises the second pump P2, straight line moving control valve (V8), right travel control valve (V9), swing arm first control valve (V10), dipper second control valve (V11), bucket (V12), the second bypass cut-out converging valve (V13) and second control valve (V14), and described guide's shuttle valve group is mainly used in straight line moving signals collecting.
2. the banked direction control valves group of medium-sized hydraulic crawler excavator according to claim 1, is characterized in that: described main valve latus rectum is 30mm, and rated pressure is 350bar, metered flow 320L/min, is common to the hydraulic crawler excavator of 20T ~ 30T level.
3. the banked direction control valves group of medium-sized hydraulic crawler excavator according to claim 1, it is characterized in that: first flow control valve (V7) and second control valve (V14) are modular unit, can by instructions for use, be equipped with positive flow control valve or inverted flux control valve, when being equipped with positive flow control valve, this medium-sized multi-way valve of hydraulic excavator group is positive flow control system, and when being equipped with inverted flux control valve, this medium-sized multi-way valve of hydraulic excavator group is inverted flux control system.
4. the banked direction control valves group of medium-sized hydraulic crawler excavator according to claim 1, it is characterized in that: the first control loop has the first external channel (12) and the second external channel (13), make dipper and scraper bowl composite move, when dipper overflow, the flow of the first pump P1 to bucket (V12) fuel feeding, reduces hydraulic system energy consumption by the first external channel (12) and the second external channel (13).
5. the banked direction control valves group of medium-sized hydraulic crawler excavator according to claim 1, it is characterized in that: the operating valve connection of the first control loop and the second control loop is arranged according to excavator real work condition of loading, the little operating valve townhouse of load is in the downstream of hydraulic circuit, thus the pressure loss of banked direction control valves inner flow passage is reduced on the less operating valve connection in-line of load during composite move, when being conducive to composite move, reduce hydraulic system energy consumption.
6. the banked direction control valves group of medium-sized hydraulic crawler excavator according to claim 1, it is characterized in that: dipper first control valve (V4) has holomorphosis loop, the oil return line of its hydraulic oil regenerates one way valve (5) with regeneration relief valve (6) and first and is connected, when dipper adduction load pressure does not reach the setting pressure of regeneration relief valve (6), the oil return of dipper loculus gets back to the large chamber of dipper through the first regeneration one way valve (5) holomorphosis, and dipper adduction speed is accelerated; When dipper adduction load pressure reaches the setting pressure of regeneration relief valve (6), regeneration function is removed.
7. the banked direction control valves group of medium-sized hydraulic crawler excavator according to claim 1, it is characterized in that: when swing arm declines, swing arm second control valve (V3) is in left position, the hydraulic oil partial regeneration in the large chamber of swing arm is to swing arm loculus, by controlling the PT open area of swing arm first control valve (V10), realize swing arm to decline other equipments of the second pump P2 not initiatively fuel feeding, the hydraulic oil supply composite move of the second pump P2; During swing arm decent car, being in right position by controlling the second bypass transfer valve (V13), cutting off the put-through channel (4) of the second pump P2, realize a car function.
8. the banked direction control valves group of medium-sized hydraulic crawler excavator according to claim 1, it is characterized in that: when dipper first control valve (V4) and dipper second control valve (V11) action, the junction of two streams of the first pump P1 and the second pump P2 is positioned at the hydraulic circuit downstream of dipper first control valve (V4) and dipper second control valve (V11), for collaborating after valve, reduce the loss of banked direction control valves internal pressure.
9. the banked direction control valves group of medium-sized hydraulic crawler excavator according to claim 1, it is characterized in that: on the in-line of rotary control valve (V2), be provided with the first fixing pressure-gradient control valve (10), swing arm second control valve (V3) in-line is provided with the second fixing pressure-gradient control valve (11), can according to actual condition, carry out assignment of traffic, accelerate to put forward revolution of arm composite move speed.
10. the banked direction control valves group of medium-sized hydraulic crawler excavator according to claim 1, it is characterized in that: its dipper first control valve (V4) is provided with the first ratio pressure-gradient control valve (7) on hydraulic circuit in-line, dipper second control valve (V11) is provided with the second ratio pressure-gradient control valve (8) on hydraulic circuit in-line, bucket (V12) is provided with the 3rd ratio pressure-gradient control valve (9) on hydraulic circuit in-line, can realize according to given input signal, distribute the flow of hydraulic pump, improve the speed of digger operating device composite move and improve handling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520245787.8U CN204590113U (en) | 2015-04-21 | 2015-04-21 | Medium-sized multi-way valve of hydraulic excavator group |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520245787.8U CN204590113U (en) | 2015-04-21 | 2015-04-21 | Medium-sized multi-way valve of hydraulic excavator group |
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| CN201520245787.8U Withdrawn - After Issue CN204590113U (en) | 2015-04-21 | 2015-04-21 | Medium-sized multi-way valve of hydraulic excavator group |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763008A (en) * | 2015-04-21 | 2015-07-08 | 山河智能装备股份有限公司 | Multi-tandem valve group of middle-sized hydraulic excavator |
| CN106640820A (en) * | 2017-01-22 | 2017-05-10 | 山东常林机械集团股份有限公司 | Multipath control valve |
| CN106759623A (en) * | 2017-02-22 | 2017-05-31 | 常熟华威履带有限公司 | A kind of hydraulic crawler excavator hydraulic control device |
| CN108589822A (en) * | 2018-05-31 | 2018-09-28 | 山东临工工程机械有限公司 | Excavate Electrical Control inverted flux control system |
| CN108589823A (en) * | 2018-05-31 | 2018-09-28 | 山东临工工程机械有限公司 | Automatically controlled positive flow master control valve assembly |
| CN111022390A (en) * | 2019-12-27 | 2020-04-17 | 恒天九五重工有限公司 | Pile machine hydraulic control system with adjustable power head speed |
| CN111395425A (en) * | 2020-04-02 | 2020-07-10 | 上海三一重机股份有限公司 | Bucket rod oil cylinder control system and method and excavator |
| CN113089764A (en) * | 2021-04-28 | 2021-07-09 | 江苏汇智高端工程机械创新中心有限公司 | Excavator linear walking control system and method based on flow sharing |
| CN113970008A (en) * | 2021-10-16 | 2022-01-25 | 山东锐凯工程机械有限公司 | Automatic control method and system for multi-way valve for hydraulic excavator |
| CN115341615A (en) * | 2022-08-29 | 2022-11-15 | 江苏汇智高端工程机械创新中心有限公司 | Multi-way valve, hydraulic system and excavator |
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2015
- 2015-04-21 CN CN201520245787.8U patent/CN204590113U/en not_active Withdrawn - After Issue
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104763008A (en) * | 2015-04-21 | 2015-07-08 | 山河智能装备股份有限公司 | Multi-tandem valve group of middle-sized hydraulic excavator |
| CN106640820A (en) * | 2017-01-22 | 2017-05-10 | 山东常林机械集团股份有限公司 | Multipath control valve |
| CN106759623B (en) * | 2017-02-22 | 2023-03-28 | 索特传动设备有限公司 | Hydraulic control device for hydraulic excavator |
| CN106759623A (en) * | 2017-02-22 | 2017-05-31 | 常熟华威履带有限公司 | A kind of hydraulic crawler excavator hydraulic control device |
| CN108589822B (en) * | 2018-05-31 | 2023-09-22 | 山东临工工程机械有限公司 | Electric control negative flow control system of excavator |
| CN108589823A (en) * | 2018-05-31 | 2018-09-28 | 山东临工工程机械有限公司 | Automatically controlled positive flow master control valve assembly |
| CN108589822A (en) * | 2018-05-31 | 2018-09-28 | 山东临工工程机械有限公司 | Excavate Electrical Control inverted flux control system |
| CN108589823B (en) * | 2018-05-31 | 2023-11-21 | 山东临工工程机械有限公司 | Main control valve assembly for electric control positive flow |
| CN111022390A (en) * | 2019-12-27 | 2020-04-17 | 恒天九五重工有限公司 | Pile machine hydraulic control system with adjustable power head speed |
| CN111022390B (en) * | 2019-12-27 | 2024-04-26 | 恒天九五重工有限公司 | Pile machine hydraulic control system with adjustable power head speed |
| CN111395425A (en) * | 2020-04-02 | 2020-07-10 | 上海三一重机股份有限公司 | Bucket rod oil cylinder control system and method and excavator |
| CN113089764A (en) * | 2021-04-28 | 2021-07-09 | 江苏汇智高端工程机械创新中心有限公司 | Excavator linear walking control system and method based on flow sharing |
| CN113970008A (en) * | 2021-10-16 | 2022-01-25 | 山东锐凯工程机械有限公司 | Automatic control method and system for multi-way valve for hydraulic excavator |
| CN113970008B (en) * | 2021-10-16 | 2024-02-27 | 山东锐凯工程机械有限公司 | Automatic control method and system for multi-way valve for hydraulic excavator |
| CN115341615A (en) * | 2022-08-29 | 2022-11-15 | 江苏汇智高端工程机械创新中心有限公司 | Multi-way valve, hydraulic system and excavator |
| CN115341615B (en) * | 2022-08-29 | 2023-09-01 | 江苏汇智高端工程机械创新中心有限公司 | Multi-way valve, hydraulic system and excavator |
| WO2024045445A1 (en) * | 2022-08-29 | 2024-03-07 | 江苏汇智高端工程机械创新中心有限公司 | Multi-way valve, hydraulic system and excavator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150826 Effective date of abandoning: 20171114 |