CN104895139B - Loading machine quantitative pump and variable pump multiplex control system - Google Patents
Loading machine quantitative pump and variable pump multiplex control system Download PDFInfo
- Publication number
- CN104895139B CN104895139B CN201510321555.0A CN201510321555A CN104895139B CN 104895139 B CN104895139 B CN 104895139B CN 201510321555 A CN201510321555 A CN 201510321555A CN 104895139 B CN104895139 B CN 104895139B
- Authority
- CN
- China
- Prior art keywords
- valve
- pressure
- control valve
- control
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
A kind of loading machine quantitative pump and variable pump multiplex control system.Solves the problem of existing loading machine control system overflow energy loss is big, and system effectiveness is low.It includes flux amplification valve, pilot control valve, equipment main valve, described flux amplification valve includes pressure-gradient control valve and reversal valve, also include constant displacement pump, variable pump, unloading control valve and interflow control valve, described constant displacement pump is connected by unloading control valve with equipment main valve, described interflow control valve includes converging valve, select shuttle valve and signal shuttle valve, variable pump is connected by pressure-gradient control valve with converging valve, described converging valve has the first position and driven by selection shuttle valve pressure oil so that the second place that pressure-gradient control valve turns on equipment main valve for causing that pressure-gradient control valve disconnects with equipment main valve during installation.The present invention is provided with interflow control valve and unloading control valve, and the spill losses of system is avoided using constant displacement pump and variable pump while pressure oil output, improves the efficiency of system.
Description
Technical field
The present invention relates to a kind of loading machine control system, and in particular to a kind of loading machine quantitative pump and variable pump complex controll
System.
Background technology
Loading machine is that a kind of cubic metre of earth and stone for being widely used in the construction projects such as highway, railway, building, water power, harbour, mine is applied
Work machinery, it is mainly used in the bulk materials such as shovel dress soil, sandstone, lime, coal, also ore, pan soil etc. slightly can be shoveled
Dig operation.The different auxiliary working apparatus that changes the outfit can also be bulldozed, lifting and the handling operation of unclassified stores such as timber.In road
Road, it is particularly in Expressway Construction, loading machine fills out digging, asphalt and coagulating cement earth material for subgrade engineering
Gather materials with charging etc. operation.Push soil can be additionally carried out, plane earth is scraped and draws the operations such as other machineries.Due to dress
Carrier aircraft has the advantages that operating speed is fast, efficiency high, mobility are good, operation is light, therefore it turns into the cubic metre of earth and stone in engineering construction
One of main machine of construction.
Existing loading machine control system generally by steering constant displacement pump, equipment constant displacement pump, guide's oil pump, steering gear,
Flux amplification valve with pressure-gradient control valve, equipment main valve, pilot control valve, accumulator etc. form.When transfer works independently
When, equipment main valve can be flowed into by pressure-gradient control valve EF mouths by turning to the excess traffic of constant displacement pump output, by leading to oil circuit in main valve
Fuel tank is flowed back to, can now produce a steering spill losses.When individually manipulating equipment main valve, steering constant displacement pump passes through excellent
The fluid of first valve EF mouths and equipment constant displacement pump output enters equipment main valve together, when equipment to stroke end or
In the case of can not being shoveled due to the too big shovel dress of load, a spill losses can be produced.Carried out simultaneously with equipment when turning to
When, turn to working barrel and preferentially supply steering, unnecessary flow enters equipment, and this Constant Pump System exists big at work
The overflow energy loss of amount, system effectiveness are low.
The content of the invention
To solve the problem of existing loading machine control system overflow energy loss is big, and system effectiveness is low in background technology,
The present invention provides a kind of loading machine quantitative pump and variable pump multiplex control system.
The technical scheme is that：A kind of loading machine quantitative pump and variable pump multiplex control system, including fuel tank, steering
Device, flux amplification valve, pilot control valve, equipment main valve, described flux amplification valve include pressure-gradient control valve and reversal valve, also wrapped
Include constant displacement pump, variable pump, unloading control valve and interflow control valve, described constant displacement pump and pass through unloading control valve and equipment master
Valve is connected, and described interflow control valve includes converging valve, selection shuttle valve and signal shuttle valve, described variable pump and passes through pressure-gradient control valve
It is connected with converging valve, described converging valve includes converging valve control mouth, and described pilot control valve is by selecting shuttle valve with closing
Stream valve control mouth is connected, described signal shuttle valve be used to choosing hydraulic oil between flux amplification valve and equipment main valve with
Variable pump is connected, described converging valve have cause during installation first position that pressure-gradient control valve and equipment main valve disconnect and by
Selection shuttle valve pressure oil drives the second place for make it that pressure-gradient control valve turns on equipment main valve.
As a modification of the present invention, described pressure-gradient control valve is connected by pressure-reducing valve with pilot control valve.
As a further improvement on the present invention, described interflow control valve includes pressure maintaining valve, and described variable pump passes through steady
Pressure valve is connected with steering gear.
As a further improvement on the present invention, described signal shuttle valve is connected by choke valve with variable pump.
As a further improvement on the present invention, in addition to anti-pressure impulsive control valve, described anti-pressure impulsive control valve
Including the anti-pressure dash valve import connected with variable pump, the anti-pressure dash valve connected with fuel tank outlet, anti-pressure dash valve
Control mouth and the anti-pressure dash valve spring mouth being connected with signal shuttle valve.
As a further improvement on the present invention, described unloading control valve includes unloading valve, logical valve and check valve, described
Constant displacement pump be connected by check valve with equipment main valve, described constant displacement pump is connected by unloading valve with fuel tank, institute
The unloading valve stated includes unloading valve oil inlet, unloading valve control mouth and off-load valve spring mouth, described unloading valve control mouth, off-load
Valve spring mouth is connected with constant displacement pump, and described logical valve includes logical valve oil inlet, logical valve oil-out, logical valve and judged
Hydraulic fluid port and logic valve spring mouth, described logical valve judge that hydraulic fluid port is connected with equipment main valve, and described logical valve judges
Hydraulic fluid port is oppositely arranged with logic valve spring mouth, and described off-load valve spring mouth is connected with logical valve oil inlet, and logical valve is fuel-displaced
Mouth is connected with fuel tank.
As a further improvement on the present invention, damping is provided between described off-load valve spring mouth and logical valve oil inlet
Hole.
The invention has the advantages that there is provided interflow control valve and unloading control valve, it is same using constant displacement pump and variable pump
When pressure oil output, by collaborate control valve control variable pump output flow, avoid the spill losses of system, pass through off-load control
Valve processed reduces overflow energy loss, improves the efficiency of system.
Brief description of the drawings
Accompanying drawing 1 is the hydraulic principle figure of existing loading machine.
Accompanying drawing 2 is the hydraulic principle figure of the embodiment of the present invention.
Accompanying drawing 3 is the hydraulic schematic diagram for collaborating control valve 9 in accompanying drawing 2.
Accompanying drawing 4 is the hydraulic schematic diagram of unloading control valve 8 in accompanying drawing 2.
Accompanying drawing 5 is the structural representation of anti-pressure impulsive control valve 10 in accompanying drawing 2.
In figure, 1, fuel tank；2nd, steering gear；3rd, flux amplification valve；31st, pressure-gradient control valve；32nd, reversal valve；4th, pilot control valve；5、
Equipment main valve；6th, constant displacement pump；7th, variable pump；8th, unloading control valve；81st, unloading valve；811st, unloading valve oil inlet；812nd, unload
Lotus valve control mouth；813rd, off-load valve spring mouth；82nd, logical valve；821st, logical valve oil inlet；822nd, logical valve oil-out；823、
Logical valve judges hydraulic fluid port；824th, logic valve spring mouth；83rd, check valve；84th, damping hole；9th, control valve is collaborated；91st, converging valve；
911st, converging valve control mouth；92nd, shuttle valve is selected；93rd, signal shuttle valve；94th, pressure-reducing valve；95th, pressure maintaining valve；96th, choke valve；10th, prevent
Compression shock control valve；101st, anti-pressure dash valve import；102nd, anti-pressure dash valve outlet；103rd, anti-pressure dash valve control
Mouthful；104th, anti-pressure dash valve spring mouth.
Embodiment
Embodiments of the present invention is further illustrated below in conjunction with the accompanying drawings：
As Fig. 2 with reference to shown in 3,4,5, a kind of loading machine quantitative pump and variable pump multiplex control system, including fuel tank 1, turn
To device 2, flux amplification valve 3, pilot control valve 4, equipment main valve 5, described flux amplification valve 3 includes pressure-gradient control valve 31 and changed
Pass through off-load control to valve 32, in addition to constant displacement pump 6, variable pump 7, unloading control valve 8 and interflow control valve 9, described constant displacement pump 6
Valve 8 processed is connected with equipment main valve 5, and described interflow control valve 9 includes converging valve 91, selection shuttle valve 92 and signal shuttle valve
93, described variable pump 7 is connected by pressure-gradient control valve 31 with converging valve 91, and described converging valve 91 includes converging valve control mouth
911, described pilot control valve 4 by selecting shuttle valve 92 to be connected with converging valve control mouth 911, use by described signal shuttle valve 93
It is connected in the hydraulic oil chosen between flux amplification valve 3 and equipment main valve 5 with variable pump 7, described converging valve 91 has
There are the first position and caused by the driving of the pressure oil of selection shuttle valve 92 for causing that pressure-gradient control valve 31 disconnects with equipment main valve 5 during installation
The second place that pressure-gradient control valve 31 turns on equipment main valve 5.The invention has the advantages that there is provided interflow control valve and unload
Lotus control valve, using constant displacement pump and variable pump pressure oil output simultaneously, the output flow of variable pump is controlled by collaborating control valve,
The spill losses of system is avoided, overflow energy is reduced by unloading control valve and lost, improves the efficiency of system.
Described pressure-gradient control valve 31 is connected by pressure-reducing valve 94 with pilot control valve 4.Specifically, described pressure-reducing valve is
Overflow-type pressure-reducing valve.Such structure causes the stable pressure oil of pressure-gradient control valve output, ensures system reliable operation.Overflow pressure-reducing valve
Setting cause high pressure when have partial high pressure oil spill stream so as to improve the security performance of system
Described interflow control valve 9 includes pressure maintaining valve 95, and described variable pump 7 is connected by pressure maintaining valve 95 with steering gear 2
Connect.Such structure ensures that variable pump exports stable pressure oil to steering gear, ensures system reliable operation.
Described signal shuttle valve 93 is connected by choke valve 96 with variable pump 7.Such structure causes signal shuttle valve pair
The control of variable pump is more accurate, avoids variable pump by signal oil impact failure.
Also include anti-pressure impulsive control valve 10 in the present invention, described anti-pressure impulsive control valve 10 includes and variable pump
The anti-pressure dash valve import 101 of 7 connections, the anti-pressure dash valve outlet 102 connected with fuel tank 1, the control of anti-pressure dash valve
Mouth 103 and the anti-pressure dash valve spring mouth 104 being connected with signal shuttle valve 93.Anti- pressure impulsive control valve have prevent from working as work
When making device main valve and returning middle position suddenly, variable pump swings to compression shock caused by small displacement from huge discharge.It is specific referring to accompanying drawing
Say, be when equipment main valve returns middle position suddenly, originally by equipment main valve supply variable pump signal oil disappear suddenly
Lose, now the anti-pressure dash valve control mouth of anti-pressure impulsive control valve controls its stem movement, anti-pressure dash valve import with
Anti- pressure dash valve outlet, a large amount of hydraulic oil of variable pump pass through from anti-pressure impulsive control valve meeting fuel tank, a small amount of hydraulic oil
The output oil pressure size of signal shuttle valve regulated variable pump so that variable pump can be adjusted slowly, avoid equipment main valve from returning suddenly
To the impact of variable pump during middle position, while also it is avoided that the overflow energy loss of system.
Described unloading control valve 8 includes unloading valve 81, logical valve 82 and check valve 83, and described constant displacement pump 6 passes through list
It is connected to valve 83 with equipment main valve 5, described constant displacement pump 6 is connected by unloading valve 81 with fuel tank 1, described off-load
Valve 81 includes unloading valve oil inlet 811, unloading valve control mouth 812 and off-load valve spring mouth 813, described unloading valve control mouth
812nd, off-load valve spring mouth 813 is connected with constant displacement pump 6, and described logical valve 82 includes logical valve oil inlet 821, logical valve
Oil-out 822, logical valve judge hydraulic fluid port 823 and logic valve spring mouth 824, and described logical valve judges hydraulic fluid port 823 and work clothes
Put main valve 5 to be connected, described logical valve judges that hydraulic fluid port 823 is oppositely arranged with logic valve spring mouth 824（This, which is oppositely arranged, refers to
Logical valve judges that hydraulic fluid port is relative with the direction of logic valve spring mouth driving logical valve stem movement, and specifically, logical valve judges
Hydraulic fluid port is located at the both ends of valve rod with logic valve spring mouth）, described off-load valve spring mouth 813 is connected with logical valve oil inlet 821
Logical, logical valve oil-out 822 is connected with fuel tank 1.In course of normal operation, constant displacement pump oil-feed passes through the fuel-displaced supply work of check valve
Make device main valve, the hypertonia at the load of equipment main valve, now, the pressure oil of equipment main valve enter logical valve
Judge hydraulic fluid port, the pressure oil overcomes the pressure of logic valve spring mouth so that the pressure oil of off-load valve spring mouth is fuel-displaced from logical valve
Mouth oil return box；Now, it is destroyed at off-load valve spring mouth with the pressure balanced at unloading valve control mouth, the pressure of unloading valve control mouth
Power oil overcomes the pressure at off-load valve spring mouth so that constant displacement pump is connected with fuel tank, unloading control valve of the invention, in flow
In constant system, the pressure loss is small, so as to avoid the energy loss of system, improves the efficiency of system.
Damping hole 84 is provided between described off-load valve spring mouth 813 and logical valve oil inlet 821.Damping hole causes off-load
Pressure oil circulation between valve spring mouth and logical valve oil inlet is steady, while ensures off-load energy quick response.
Referring to accompanying drawing 2,3,4,5, the operation principle of the present invention is further elaborated：When transfer works independently
When, variable pump（High pressure is adjustable oil pump）Output oil pressure, the oil pressure supply pressure-gradient control valve all the way, pass through S1 mouths, interflow control valve all the way
Pressure maintaining valve, S2 mouths export to steering gear, steering gear control reversal valve commutation, the pressure oil at pressure-gradient control valve exports after reversal valve
To transfer.Now converging valve is closed, LS1 mouths, signal shuttle on the pressure oil ECDC flow control valve of flux amplification valve output
Valve, LS2 mouths feed back to variable pump, now, quantify air pump inoperative, steering is exactly a load sensitive system, will not be produced
Spill losses；When individually manipulating equipment main valve, variable pump becomes maximum displacement mode and work is supplied together with constant displacement pump
Device.The A mouths of the pressure oil of constant displacement pump road interflow control valve after unloading valve；Pilot control valve is opened, the height of variable pump output
Press oil the EF mouths through pressure-gradient control valve, pressure-reducing valve, the XP mouths for collaborating control valve, supply pilot control valve, pressure oil on pilot control valve
Equipment main valve commutation action is supplied all the way, enters converging valve control mouth by selection shuttle valve all the way, and converging valve is opened, preferentially
The hydraulic oil of valve EF mouths and the pressure oil of constant displacement pump are exported to equipment through the main valve that works.Specifically, described selection shuttle
Valve has two, corresponds to three oil-outs of pilot control valve respectively.When equipment pressure rise is to unloading valve set pressure,
Equipment constant displacement pump off-load；When equipment to stroke end or due to load too it is big shovel dress can not shovel in the case of, conjunction
The A mouth pressure rises of flow control valve, the pressure oil feed back to variable pump by signal shuttle valve, interflow control valve LS2 mouths.Now
Variable pumpage reduces, and only maintains pressure output, will not produce spill losses；When turning to and equipment works simultaneously, become
Amount pump becomes maximum displacement mode, preferentially supplies transfer by pressure-gradient control valve, excess traffic supply equipment, works as equipment
In the case of can not being shoveled to stroke end or due to the too big shovel dress of load, variable pump is due to pressure cut off function, variable
Pumpage reduces, and only maintains pressure output, will not produce spill losses.
Every technical staff's notice：Although the present invention describes according to above-mentioned embodiment, of the invention
Invention thought be not limited to that invention, any repacking with inventive concept, will all include this patent protection of the patent right
In the range of.
Claims (5)
1. a kind of loading machine quantitative pump and variable pump multiplex control system, including fuel tank（1）, steering gear（2）, flux amplification valve
（3）, pilot control valve（4）, equipment main valve（5）, described flux amplification valve（3）Including pressure-gradient control valve（31）And reversal valve
（32）, it is characterised in that:Also include constant displacement pump（6）, variable pump（7）, unloading control valve（8）With interflow control valve（9）, it is described
Constant displacement pump（6）Pass through unloading control valve（8）With equipment main valve（5）It is connected, described interflow control valve（9）Including interflow
Valve（91）, selection shuttle valve（92）With signal shuttle valve（93）, described variable pump（7）Pass through pressure-gradient control valve（31）With converging valve（91）Phase
Connection, described converging valve（91）Including converging valve control mouth（911）, described pilot control valve（4）By selecting shuttle valve
（92）With converging valve control mouth（911）It is connected, described signal shuttle valve（93）For choosing flux amplification valve（3）With work clothes
Put main valve（5）Between hydraulic oil and variable pump（7）It is connected, described converging valve（91）Cause pressure-gradient control valve during with installation
（31）With equipment main valve（5）The first position of disconnection and by selection shuttle valve（92）Pressure oil, which drives, causes pressure-gradient control valve（31）With
Equipment main valve（5）The second place of conducting, described pressure-gradient control valve（31）Pass through pressure-reducing valve（94）With pilot control valve（4）Phase
Connection, described interflow control valve（9）Including pressure maintaining valve（95）, described variable pump（7）Pass through pressure maintaining valve（95）With steering gear
（2）It is connected.
2. loading machine quantitative pump according to claim 1 and variable pump multiplex control system, it is characterised in that described letter
Number shuttle valve（93）Pass through choke valve（96）With variable pump（7）It is connected.
3. loading machine quantitative pump according to claim 1 and variable pump multiplex control system, it is characterised in that also include anti-
Compression shock control valve（10）, described anti-pressure impulsive control valve（10）Including with variable pump（7）The anti-compression shock of connection
Valve import（101）With fuel tank（1）The anti-pressure dash valve outlet of connection（102）, anti-pressure dash valve control mouth（103）With with
Signal shuttle valve（93）The anti-pressure dash valve spring mouth being connected（104）.
4. loading machine quantitative pump according to claim 1 and variable pump multiplex control system, it is characterised in that described unloads
Lotus control valve（8）Including unloading valve（81）, logical valve（82）And check valve（83）, described constant displacement pump（6）Pass through check valve
（83）With equipment main valve（5）It is connected, described constant displacement pump（6）Pass through unloading valve（81）With fuel tank（1）It is connected, it is described
Unloading valve（81）Including unloading valve oil inlet（811）, unloading valve control mouth（812）With off-load valve spring mouth（813）, it is described
Unloading valve control mouth（812）, off-load valve spring mouth（813）And constant displacement pump（6）It is connected, described logical valve（82）Including patrolling
Collect valve oil inlet（821）, logical valve oil-out（822）, logical valve judge hydraulic fluid port（823）With logic valve spring mouth（824）, it is described
Logical valve judge hydraulic fluid port（823）With equipment main valve（5）It is connected, described logical valve judges hydraulic fluid port（823）With logic
Valve spring mouth（824）It is oppositely arranged, described off-load valve spring mouth（813）With logical valve oil inlet（821）It is connected, logical valve
Oil-out（822）With fuel tank（1）It is connected.
5. loading machine quantitative pump according to claim 4 and variable pump multiplex control system, it is characterised in that described unloads
He Fadanhuangkou（813）With logical valve oil inlet（821）Between be provided with damping hole（84）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510321555.0A CN104895139B (en) | 2015-06-12 | 2015-06-12 | Loading machine quantitative pump and variable pump multiplex control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510321555.0A CN104895139B (en) | 2015-06-12 | 2015-06-12 | Loading machine quantitative pump and variable pump multiplex control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104895139A CN104895139A (en) | 2015-09-09 |
| CN104895139B true CN104895139B (en) | 2018-01-16 |
Family
ID=54028068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510321555.0A Active CN104895139B (en) | 2015-06-12 | 2015-06-12 | Loading machine quantitative pump and variable pump multiplex control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104895139B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640817B (en) * | 2017-01-04 | 2018-11-13 | 浙江高宇液压机电有限公司 | The pressure compensation type energy-saving control valve of shunting hydraulic system is closed suitable for double pump |
| CN106836337B (en) * | 2017-03-30 | 2022-09-20 | 徐州徐工筑路机械有限公司 | Land leveler variable hydraulic system |
| CN113090599B (en) * | 2021-03-31 | 2022-07-05 | 徐工集团工程机械股份有限公司科技分公司 | Logic control valve and hydraulic system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010009705A1 (en) * | 2010-03-01 | 2011-09-01 | Robert Bosch Gmbh | Hydraulic control arrangement |
| CN201800764U (en) * | 2010-08-18 | 2011-04-20 | 内蒙古北方重型汽车股份有限公司 | Steering control system of heavy duty mine dump truck |
| CN102518170B (en) * | 2011-12-27 | 2014-10-22 | 四川大学 | Hydraulic system of loading machine working device |
| CN103882897A (en) * | 2012-12-20 | 2014-06-25 | 青岛鲁达工程机械制造有限公司 | Loader hydraulic system |
| CN204703220U (en) * | 2015-06-12 | 2015-10-14 | 圣邦集团有限公司 | Loading machine quantitative pump and variable pump multiplex control system |
-
2015
- 2015-06-12 CN CN201510321555.0A patent/CN104895139B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104895139A (en) | 2015-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204703220U (en) | Loading machine quantitative pump and variable pump multiplex control system | |
| CN104895139B (en) | Loading machine quantitative pump and variable pump multiplex control system | |
| CN103993623B (en) | Excavator and bucket hydraulic system thereof and the method controlling its scraper bowl excavation speed | |
| CN103628518B (en) | A kind of composite action priority control system, method and excavator | |
| CN101967980B (en) | Cutterhead closed type hydraulic drive system adopting revolving speed-variable and displacement-variable compound control | |
| CN104061196B (en) | Novel hydraulic system for loader | |
| CN205778895U (en) | A kind of pressurize pump installation preventing shield screw machine from gushing | |
| CN106168113B (en) | A kind of propulsive mechanism reinforcement control system of horizontal directional drilling machine | |
| CN102704525B (en) | Hydraulic loop of excavator | |
| CN103526796B (en) | Digging machine disintegrating hammer hydraulic motor flow control device | |
| CN104405006B (en) | Loading machine semi-variety hydraulic system | |
| CN201696054U (en) | Closed-type hydraulic driving system with variable-speed variable-displacement combined control of shield cutter head | |
| CN104727372A (en) | Engineering machinery swing arm energy-saving drive system | |
| CN103925251A (en) | Valve control and pump control switching control valve set | |
| CN204491707U (en) | Loader semi-variety hydraulic system | |
| CN102052361A (en) | Novel hydraulic oil channel integrated valve for loader | |
| CN104061197B (en) | Hydraulic system of loader | |
| CN102840193B (en) | Water pressure fluctuation excitation device | |
| CN207848069U (en) | A kind of rotation of horizontal directional drilling machine power head prevents reverse control system | |
| CN103967735A (en) | Hydraulic drive type slurry sucking and discharging device | |
| CN106638757A (en) | Auxiliary combined flow control valve for loader | |
| CN214661148U (en) | Single-pump-source load port independent load sensitive energy-saving excavator hydraulic system | |
| CN108050113A (en) | A kind of horizontal directional drilling machine power head rotation prevents reverse control system | |
| CN214837547U (en) | Stabilizing module and loading system with same | |
| CN203270662U (en) | Hydraulic oil circuit, hydraulic steering system, and loading machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |