CN107288958A - A kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system and pre-heating mean - Google Patents
A kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system and pre-heating mean Download PDFInfo
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- CN107288958A CN107288958A CN201710724569.6A CN201710724569A CN107288958A CN 107288958 A CN107288958 A CN 107288958A CN 201710724569 A CN201710724569 A CN 201710724569A CN 107288958 A CN107288958 A CN 107288958A
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- mouths
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
Abstract
The invention discloses a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system, including guide oil source block, hydraulic oil container, soil-shifting pilot valve, right handles pilot valve, feet pilot valve, left handle pilot valve, preheating branching block, fuel feeding branching block and oil return branching block；Guide oil source block is connected with preheating branching block, by being connected after shunting with the threeway on each pilot valve；Fuel feeding branching block is connected with the threeway on each pilot valve, is connected after collecting with guide oil source block；Oil return branching block is connected with the T mouths of each pilot valve, is connected after collecting with hydraulic oil container.The present invention can be under excavator idling mode, preheat leading hydraulic system, in this way, even extremely trembling with fear under environment, it is ensured that the firm rising of oil temperature in pilot system, it is to avoid pilot valve works under extreme use condition, the sealing elements therein premature failure for being prevented effectively from pilot valve is damaged, reliability is improved, maintenance cost is reduced, extends machine life.
Description
Technical field
The present invention relates to excavator field, and in particular to a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system.
Background technology
Hydraulic crawler excavator pre- hot hydraulic system of need of work under environment of extremely trembling with fear, it is close if being not reaching to suitable temperature
The sealing effectiveness of sealing can be affected, and reduce its life-span, or even damage oil leak.Conventional hydraulic system warm is：Hair
Excavator is in holding state after motivation starts, and hydraulic oil returns to fuel tank after reaching main valve middle position off-load by main pump, herein mistake
Cheng Zhong, hydraulic oil dams generation heat come heating system by main valve, so that the effect to reach preheating.And during this, follow
The hydraulic oil of ring has only passed through main pump, main valve, not over pilot system, only operates excavator action, pilot system just meeting
It is preheated.And now excavator action is must to make to produce the larger temperature difference inside pilot valve, the failure of valve interior sealing element is lured into,
Its sealing effectiveness is destroyed, causes the later stage to damage oil leak, reliability is reduced, increases maintenance cost.
The content of the invention
In view of the above-mentioned problems of the prior art, the present invention provide a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system with
And pre-heating mean, leading hydraulic system can be preheated under excavator idling mode, it is worked under suitable oil temperature, improved
Reliability, increases the service life.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system, including guide oil source block, hydraulic oil container, soil-shifting pilot valve, right handles
Pilot valve, feet pilot valve, left handle pilot valve, preheating branching block, fuel feeding branching block and oil return branching block；The soil-shifting guide
Valve, right handles pilot valve, the oil inlet of feet pilot valve and left handle pilot valve are equipped with a threeway；The guide oil source block with
Branching block connection is preheated, by being connected after shunting with the threeway on each pilot valve；The fuel feeding branching block and each pilot valve
On threeway connection, collect after be connected with guide oil source block；The oil return branching block is connected with the T mouths of each pilot valve, is collected
It is connected afterwards with hydraulic oil container.
Preferably, the guide oil source block include throttle orifice, it is filter, pressure-reducing valve, pressure measuring tie-in, accumulator, unidirectional
Valve, safety overflow valve, security solenoid valve and high low-speed solenoid valve of walking；The guide oil source block provided with P mouthfuls, A mouthfuls, B mouthfuls, C mouthfuls,
BV mouthfuls, PR mouthfuls, T mouthfuls；Described P mouthfuls is connected with the entrance of throttle orifice, and the outlet of the throttle orifice is connected with the entrance of filter again,
The outlet of the filter and the 1 of pressure-reducing valve mouthful of connection；2 mouthfuls, A mouthfuls, B mouthfuls of the pressure-reducing valve, 1 mouthful and walking height of check valve
It is interconnected between 3 mouthfuls of low-speed solenoid valve；2 mouthfuls, C mouthfuls, 1 mouthful of safety overflow valve of the check valve and security solenoid valve
It is interconnected between 3 mouthfuls；3 mouthfuls, T mouthfuls, 2 mouthfuls of safety overflow valve, 1 mouthful of security solenoid valve of the pressure-reducing valve and walking height
It is interconnected between 1 mouthful of fast magnetic valve.
Preferably, the outside main pump of P mouths connection in the guide oil source block；T mouths connection in the guide oil source block
Hydraulic oil container；Connected outside PR mouths in the guide oil source block with the control port of running motor speed change；The pilot control
It is connected outside A mouths in block with pressure measuring tie-in, the pressure size for measuring pilot system；C mouths in the guide oil source block
Outside is connected with accumulator, pilot pressure oil uninstalling system pressure can be provided after excavator shutdown, while can also stablize
The pressure of pilot system in course of normal operation.
Preferably, the B mouths in the guide oil source block with preheat branching block R1 mouths be connected, by after shunting with each
The P2 mouths connection of threeway on pilot valve；The R5 mouths of the preheating branching block are connected with the P1 mouths of threeway on soil-shifting pilot valve, in advance
The R4 mouths of thermal shunt block are connected with the P1 mouths of threeway on right handles pilot valve, preheat the R3 mouths of branching block and threeway on feet pilot valve
P1 mouths connection, preheating branching block R2 mouths be connected with the P1 mouths of threeway on left handle pilot valve.
Preferably, the fuel feeding branching block is connected with the P1 mouths of the threeway on each pilot valve；
The P1 mouths of threeway on the soil-shifting pilot valve are connected with the P5 mouths of fuel feeding branching block, threeway on the right handles pilot valve
P1 mouths be connected with the P4 mouths of fuel feeding branching block, the P3 mouths of the P1 mouths of the threeway on the feet pilot valve and fuel feeding branching block are even
Connect, the P1 mouths of the threeway on the left handle pilot valve, with being connected, collaborate with the P2 mouths of fuel feeding branching block by fuel feeding branching block
After collecting, the P1 mouths on fuel feeding branching block are connected with the BV mouths in guide oil source block.
Preferably, the T mouths on the soil-shifting pilot valve are connected with the T5 mouths of oil return branching block, the right handles pilot valve
On T mouths be connected with the T4 mouths of oil return branching block, the T mouths on the feet pilot valve are connected with the T3 mouths of oil return branching block, described
The T2 mouths of T mouths on left handle pilot valve and oil return branching block are with being connected, after collecting by oil return branching block interflow, oil return shunting
T1 mouths on block are connected with hydraulic oil container.
Preferably, there are P1 mouthfuls and P2 mouthfuls in the threeway, and P2 is connected with P1 mouthfuls.
A kind of hydraulic crawler excavator guide hydraulic pressure pre-heating mean, this method is：After engine start, excavator is in standby shape
State, security solenoid valve no power is in the normal state, i.e., the 1 of security solenoid valve mouthful is connected with 2 mouthfuls；The pressure oil of outside main pump is by first
After throttle orifice, filter and pressure-reducing valve inside Oil Guide source block, because throttling action produces heat, hydraulic fluid temperature is enhanced；
Pressure oil by heating preheats the R1 mouths of branching block by the B mouths flow direction of guide oil source block, is reached and each after shunting
P2 is connected with P1 mouthfuls in P2 mouths in the threeway that P mouthfuls of pilot valve is connected, threeway, in the threeway being connected on each pilot valve
P1 mouthfuls connect with fuel feeding branching block 9, and the hydraulic oil after fuel feeding branching block 9 collects reaches the BV mouths of guide oil source block, now
Security solenoid valve is in the normal state, and hydraulic oil eventually passes through guide by 1 mouthful of 2 mouthfuls of arrival security solenoid valves of security solenoid valve
T mouths in oil sources block return to hydraulic oil container.
Preferably, when security solenoid valve, which is powered, signal, security solenoid valve switchs to right position working condition, i.e. safety electricity
2 mouthfuls of magnet valve are connected with 3 mouthfuls, and the hydraulic oil after fuel feeding branching block collects passes through 3 mouthfuls of security solenoid valve and 2 mouthfuls of companies of check valve
Logical, now whole leading hydraulic system formation pressure circuit, is operated and running motor speed by commutation process to each pilot valve
Degree carries out conventional control.
Beneficial effect of the present invention：
Under excavator idling mode, the pressure oil after guide oil source block pressure-reducing valve heats guide by preheating pipeline
Hydraulic system.In this way, even extremely trembling with fear under environment, it is ensured that the firm rising of oil temperature in pilot system, it is to avoid first
Pilot valve is worked under extreme use condition, and the sealing elements therein for being prevented effectively from pilot valve is damaged, and improves reliability, reduction dimension
Accomplish this, extend machine life.In this way, while accelerating the rising of complete machine hydraulic oil temperature, the behaviour at complete machine initial stage is improved
Make performance, shorten warm-up period, reduce energy consumption, save time and cost.
Brief description of the drawings
Fig. 1 is the hydraulic principle schematic diagram of the present invention；
In figure：1st, guide oil source block, 1-1, throttle orifice, 1-2, filter, 1-3, pressure-reducing valve, 1-4, pressure measuring tie-in, 1-5, accumulation of energy
Device, 1-6, check valve, 1-7, safety overflow valve, 1-8, security solenoid valve, 1-9, the high low-speed solenoid valve of walking, 2, hydraulic oil container,
3rd, threeway, 4, soil-shifting pilot valve, 5, right handles pilot valve, 6, feet pilot valve, 7, left handle pilot valve, 8, preheating branching block, 9,
Fuel feeding branching block, 10, oil return branching block.
Embodiment
Below in conjunction with accompanying drawing, by specific embodiment, the present invention is further illustrated.
As shown in figure 1, a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system, including guide oil source block 1, hydraulic oil container 2, push away
Native pilot valve 4, right handles pilot valve 5, feet pilot valve 6, left handle pilot valve 7, preheating branching block 8, fuel feeding branching block 9, oil return
Branching block 10；One is equipped with the oil inlet of soil-shifting pilot valve 4, right handles pilot valve 5, feet pilot valve 6 and left handle pilot valve 7
Individual threeway 3.
Guide oil source block 1 includes throttle orifice 1-1, filter 1-2, pressure-reducing valve 1-3, pressure measuring tie-in 1-4, accumulator 1-5, check valve
1-6, safety overflow valve 1-7, security solenoid valve 1-8 and the high low-speed solenoid valve 1-9 that walks；Guide oil source block 1 provided with P mouthfuls, A mouthfuls,
B mouthfuls, C mouthfuls, BV mouthfuls, PR mouthfuls, T mouthfuls；P mouthfuls are connected with throttle orifice 1-1 entrance, and throttle orifice 1-1 outlet is again with filter 1-2's
Entrance is connected, and filter 1-2 outlet is connected with 1 mouthful of pressure-reducing valve 1-3；Pressure-reducing valve 1-3 2 mouthfuls, A mouthfuls, B mouthfuls, check valve 1-6
1 mouthful and 3 mouthfuls of the high low-speed solenoid valve 1-9 of walking between be interconnected；Check valve 1-6 2 mouthfuls, C mouthfuls, safety overflow valve 1-7
1 mouthful and 3 mouthfuls of security solenoid valve 1-8 between be interconnected；3 mouthfuls of pressure-reducing valve 1-3, T mouthfuls, 2 mouthfuls of safety overflow valve 1-7,
It is interconnected between 1 mouthful and 1 mouthful of the high low-speed solenoid valve 1-9 of walking of security solenoid valve 1-8.
The outside main pump of P mouths connection in guide oil source block 1；T mouths connection hydraulic oil container 2 in guide oil source block 1；Guide oil
Connected outside PR mouths in source block 1 with the control port of running motor speed change；Connect outside A mouths in guide oil source block 1 with pressure measurement
Head 1-4 connections, can measure the pressure size of pilot system；It is connected outside C mouths in guide oil source block 1 with accumulator 1-5, can
To provide pilot pressure oil uninstalling system pressure after excavator is shut down, while guide system in course of normal operation can also be stablized
The pressure of system.
Guide's hydraulic pressure pre-heating system takes pressure-reducing valve 1-3 and list of the hydraulic oil of B mouthfuls of hydraulic fluid port inside guide oil source block 1
Hydraulic oil between valve 1-6, i.e.,：B mouths in guide oil source block 1 with 2 mouthfuls of 1 mouthful and check valve 1-6 of pressure-reducing valve 1-3 mutually
Connection, B mouthfuls of guide oil source block is connected with preheating the R1 mouths of branching block 8, passes through the P2 after shunting with the threeway 3 on each pilot valve
Mouth connection；The R5 mouths of preheating branching block 8 are connected, preheated R4 mouths and the right side of branching block 8 with the P1 mouths of threeway 3 on soil-shifting pilot valve 4
The P1 mouths connection of threeway 3 in handle pilot valve 5, the R3 mouths of preheating branching block 8 are connected, in advance with the P1 mouths of threeway 3 on feet pilot valve 6
The R2 mouths of thermal shunt block 8 are connected with the P1 mouths of threeway 3 on left handle pilot valve 7, and threeway 3 is connected with each pilot valve oil inlet P.
Fuel feeding branching block 9 is connected with the P1 mouths of the threeway 3 on each pilot valve；The P1 mouths of threeway 3 on soil-shifting pilot valve 4
Be connected with the P5 mouths of fuel feeding branching block 9, on right handles pilot valve 5 the P1 mouths of threeway 3 be connected with the P4 mouths of fuel feeding branching block 9, pin
The P1 mouths of threeway 3 on pilot valve 6 are connected with the P3 mouths of fuel feeding branching block 9, the P1 mouths of threeway 3 on left handle pilot valve 7 with
The P2 mouths of fuel feeding branching block 9 are with being connected, after collecting by the interflow of fuel feeding branching block 9, P1 mouths and guide oil on fuel feeding branching block 9
BV mouths connection in source block 1.
T mouths on each pilot valve are connected with oil return branching block 10；T mouths and oil return branching block 10 on soil-shifting pilot valve 4
The connection of T5 mouths, T mouths on right handles pilot valve 5 be connected with the T4 mouths of oil return branching block 10, the T mouths on feet pilot valve 6 and time
The T3 mouths connection of oily branching block 10, the T2 mouths of the T mouths on left handle pilot valve 7 and oil return branching block 10 are with being connected, by oil return
After the interflow of branching block 10 is collected, the T1 mouths on oil return branching block 10 are connected with hydraulic oil container 2.
The course of work：
After engine start, excavator is in holding state, and security solenoid valve 1-8 no powers are in the normal state, i.e., 1 mouthful and 2 mouthfuls
UNICOM.The pressure oil of outside main pump is after throttle orifice 1-1 and pressure-reducing valve 1-3 inside guide oil source block, due to throttling action
Produce heat, hydraulic fluid temperature rise.Pressure oil by heating preheats the R1 mouths of branching block 8 by B mouthfuls of flow directions, by shunting
Phase on P2 and P1 mouthfuls of UNICOM in the P2 mouths in the threeway 3 being connected with P mouthfuls of each pilot valve, threeway 3, each pilot valve is reached afterwards
P1 mouths and the UNICOM of fuel feeding branching block 9 in the threeway 3 of connection, the hydraulic oil after fuel feeding branching block 9 collects reach guide oil
The BV mouths of source block, now security solenoid valve 1-8 be in the normal state, hydraulic oil eventually passes through T mouthfuls of oil return oil duct and returns to hydraulic oil container 2.
As can be seen that when excavator is in holding state, hydraulic oil forms a kind of circulation of flowing during from this, therefore the hydraulic pressure of heating
Oil can heat whole leading hydraulic system by above-mentioned this circulation, and this process is not required to the participation of very important person.Work as safety
Magnetic valve 1-8 is powered when having signal, and security solenoid valve 1-8 switchs to right position working condition, and its 2 mouthfuls are connected with 3 mouthfuls, as described above institute
The hydraulic oil after fuel feeding branching block 9 collects stated, by 3 mouthfuls of security solenoid valve 1-8 and check valve 1-6 UNICOMs, now
Whole leading hydraulic system formation pressure circuit, can be operated to each pilot valve by commutation process and running motor speed is entered
The conventional control of row.
Under excavator idling mode, the pressure oil after guide oil source block pressure-reducing valve is heated by preheating pipeline
Leading hydraulic system.In this way, even extremely trembling with fear under environment, it is ensured that the firm rising of oil temperature in pilot system, keep away
Exempt from pilot valve to work under extreme use condition, the sealing elements therein for being prevented effectively from pilot valve is damaged, improve reliability, drop
Low maintenance cost, extends machine life.In this way, while accelerating the rising of complete machine hydraulic oil temperature, complete machine initial stage is improved
Operating characteristics, shorten warm-up period, reduce energy consumption, save time and cost.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (9)
1. a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system, it is characterised in that：Including guide oil source block（1）, hydraulic oil container
（2）, soil-shifting pilot valve（4）, right handles pilot valve（5）, feet pilot valve（6）, left handle pilot valve（7）, preheating branching block（8）、
Fuel feeding branching block（9）With oil return branching block（10）；
The soil-shifting pilot valve（4）, right handles pilot valve（5）, feet pilot valve（6）With left handle pilot valve（7）Oil inlet it is equal
Provided with a threeway（3）；
The guide oil source block（1）With preheating branching block（8）Connection, by after shunting with the threeway on each pilot valve（3）Even
Connect；
The fuel feeding branching block（9）With the threeway on each pilot valve（3）Connection, collects rear and guide oil source block（1）Connection；
The oil return branching block（10）It is connected with the T mouths of each pilot valve, collects rear and hydraulic oil container（2）Connection.
2. a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system according to claim 1, it is characterised in that：The guide oil
Source block（1）Including throttle orifice（1-1）, filter（1-2）, pressure-reducing valve（1-3）, pressure measuring tie-in（1-4）, accumulator（1-5）, it is unidirectional
Valve（1-6）, safety overflow valve（1-7）, security solenoid valve（1-8）With high low-speed solenoid valve of walking（1-9）；
The guide oil source block（1）Provided with P mouthfuls, A mouthfuls, B mouthfuls, C mouthfuls, BV mouthfuls, PR mouthfuls, T mouthfuls；
P mouthfuls and the throttle orifice（1-1）Entrance connection, the throttle orifice（1-1）Outlet again and filter（1-2）Entrance
It is connected, the filter（1-2）Outlet and pressure-reducing valve（1-3）1 mouthful connection；
The pressure-reducing valve（1-3）2 mouthfuls, A mouthfuls, B mouthfuls, check valve（1-6）1 mouthful and the high low-speed solenoid valve of walking（1-9）3 mouthfuls
Between be interconnected；
The check valve（1-6）2 mouthfuls, C mouthfuls, safety overflow valve（1-7）1 mouthful and security solenoid valve（1-8）3 mouthfuls between phase
It is intercommunicated；
The pressure-reducing valve（1-3）3 mouthfuls, T mouthfuls, safety overflow valve（1-7）2 mouthfuls, security solenoid valve（1-8）1 mouthful and walking
High low-speed solenoid valve（1-9）1 mouthful between be interconnected.
3. a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system according to claim 2, it is characterised in that：
The guide oil source block（1）In the outside main pump of P mouths connection；The guide oil source block（1）In T mouths connection hydraulic oil container
（2）；The guide oil source block（1）In PR mouths outside connected with the control port of running motor speed change；The guide oil source block
（1）In A mouths are outside and pressure measuring tie-in（1-4）Connection, the pressure size for measuring pilot system；The guide oil source block
（1）In C mouths are outside and accumulator（1-5）Connection, can provide pilot pressure oil uninstalling system pressure after excavator shutdown,
The pressure of pilot system in course of normal operation can also be stablized simultaneously.
4. a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system according to claim 1, it is characterised in that：The guide oil
Source block（1）In B mouths with preheating branching block（8）R1 mouths connection, by after shunting with the threeway on each pilot valve（3）P2
Mouth connection；
The preheating branching block（8）R5 mouths and soil-shifting pilot valve（4）The P1 mouths connection of upper threeway, preheats branching block（8）R4
Mouth and right handles pilot valve（5）The P1 mouths connection of upper threeway, preheats branching block（8）R3 mouths and feet pilot valve（6）Upper threeway
P1 mouthfuls of connections, preheat branching block（8）R2 mouths and left handle pilot valve（7）The P1 mouths connection of upper threeway.
5. a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system according to claim 1, it is characterised in that：The fuel feeding point
Flow block（9）With the threeway on each pilot valve（3）P1 mouths connection；
The soil-shifting pilot valve（4）On threeway P1 mouths and fuel feeding branching block（9）P5 mouths connection, the right handles pilot valve
（5）The P1 mouths of upper threeway and fuel feeding branching block（9）P4 mouths connection, the feet pilot valve（6）On threeway P1 mouths and fuel feeding
Branching block（9）P3 mouths connection, the left handle pilot valve（7）On threeway P1 mouths and fuel feeding branching block（9）P2 mouths with
Connection, by fuel feeding branching block（9）After interflow is collected, fuel feeding branching block（9）On P1 mouths and guide oil source block（1）On BV mouths
Connection.
6. a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system according to claim 1, it is characterised in that：It is described to bulldoze first
Pilot valve（4）On T mouths and oil return branching block（10）T5 mouths connection, the right handles pilot valve（5）On T mouths and oil return shunt
Block（10）T4 mouths connection, the feet pilot valve（6）On T mouths and oil return branching block（10）T3 mouths connection, the left handle
Pilot valve（7）On T mouths and oil return branching block（10）T2 mouths with being connected, by oil return branching block（10）After interflow is collected, return
Oily branching block（10）On T1 mouths and hydraulic oil container（2）Connection.
7. a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating system according to claim 1, it is characterised in that：The threeway
（3）On have P1 mouthfuls and P2 mouthfuls, and P2 is connected with P1 mouthfuls.
8. a kind of pre-heating mean of hydraulic crawler excavator guide's hydraulic pressure pre-heating system based on described in claim 1, it is characterised in that：
After engine start, excavator is in holding state, security solenoid valve（1-8）No power is in the normal state, i.e. safety electromagnetic
Valve（1-8）1 mouthful connected with 2 mouthfuls；The pressure oil of outside main pump passes through guide oil source block（1）Internal throttle orifice（1-1）, filtering
Device（1-2）And pressure-reducing valve（1-3）Afterwards, because throttling action produces heat, hydraulic fluid temperature is enhanced；By the pressure oil of heating
Pass through guide oil source block（1）B mouths flow direction preheating branching block（8）R1 mouths, reached after shunting and P mouthfuls of phases of each pilot valve
The threeway of connection（3）On P2 mouths, threeway（3）Upper P2 is connected with P1 mouthfuls, the threeway being connected on each pilot valve（3）On P1
Mouth is connected with fuel feeding branching block 9, and the hydraulic oil after fuel feeding branching block 9 collects reaches guide oil source block（1）BV mouths, now
Security solenoid valve（1-8）It is in the normal state, hydraulic oil passes through security solenoid valve（1-8）2 mouthfuls arrival security solenoid valves（1-8）1
Mouthful, eventually pass through guide oil source block（1）In T mouths return to hydraulic oil container（2）.
9. a kind of hydraulic crawler excavator guide hydraulic pressure pre-heating mean according to claim 8, it is characterised in that：Work as safety electromagnetic
Valve（1-8）When energization has signal, security solenoid valve（1-8）Switch to right position working condition, i.e. security solenoid valve（1-8）2 mouthfuls and 3
Mouth connection, fuel feeding branching block（9）Hydraulic oil after collecting passes through security solenoid valve（1-8）3 mouthfuls and check valve（1-6）2 mouthfuls
Connection, now whole leading hydraulic system formation pressure circuit, is operated and running motor by commutation process to each pilot valve
Speed carries out conventional control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710724569.6A CN107288958B (en) | 2017-08-22 | 2017-08-22 | Pilot hydraulic preheating system and method for hydraulic excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710724569.6A CN107288958B (en) | 2017-08-22 | 2017-08-22 | Pilot hydraulic preheating system and method for hydraulic excavator |
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| CN107288958A true CN107288958A (en) | 2017-10-24 |
| CN107288958B CN107288958B (en) | 2023-04-18 |
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| CN201710724569.6A Active CN107288958B (en) | 2017-08-22 | 2017-08-22 | Pilot hydraulic preheating system and method for hydraulic excavator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819104A (en) * | 2021-11-25 | 2021-12-21 | 徐州徐工挖掘机械有限公司 | Hydraulic system and excavator |
| CN113833050A (en) * | 2021-09-24 | 2021-12-24 | 徐工集团工程机械股份有限公司 | Electrically controlled load sensitive hydraulic system of small excavator |
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| CN104947734A (en) * | 2014-03-28 | 2015-09-30 | 株式会社久保田 | Hydraulic system for working machine |
| CN105114400A (en) * | 2015-08-27 | 2015-12-02 | 北汽福田汽车股份有限公司 | Closed type hydraulic system with pre-heating function and control method of closed type hydraulic system |
| CN207111594U (en) * | 2017-08-22 | 2018-03-16 | 徐州徐工挖掘机械有限公司 | Hydraulic crawler excavator guide's hydraulic pressure pre-heating system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833050A (en) * | 2021-09-24 | 2021-12-24 | 徐工集团工程机械股份有限公司 | Electrically controlled load sensitive hydraulic system of small excavator |
| CN113819104A (en) * | 2021-11-25 | 2021-12-21 | 徐州徐工挖掘机械有限公司 | Hydraulic system and excavator |
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