Emergency hydraulic control system, control method and crane
By designing an independent hydraulic power source for loading and unloading and an emergency hydraulic control system with a load-sensitive pump emergency switching valve in a large-tonnage crane, the problem of insufficient emergency measures in the hydraulic system is solved, achieving independent emergency power supply and safety assurance, avoiding oil interchange, and reducing costs and volume.
Patent Information
- Application Number
- CN202511930421.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-02-27
AI Technical Summary
Existing large-tonnage and ultra-large-tonnage all-terrain cranes lack adequate emergency measures in their hydraulic systems. In particular, they cannot retract the boom in time when the upper working part fails or the outriggers cannot retract when the chassis traveling part fails, posing safety hazards. Furthermore, existing emergency measures have insufficient flow, high cost, and large size. Fluid exchange may lead to pump cavitation or insufficient fluid.
Design an emergency hydraulic control system that makes the hydraulic sources of the upper and lower vehicles independent of each other. The chassis hydraulic system is provided with emergency power by a power trolley. The load-sensitive pump maintains maximum displacement through an emergency switching valve. The power trolley can provide emergency power to the chassis and the upper vehicle respectively. Each system operates independently through quick-connect connection to avoid oil interchange.
It enables the chassis and upper vehicle to operate independently in the event of a hydraulic system failure, providing emergency power, ensuring safety, avoiding oil exchange issues, maintaining the maximum displacement of the load-sensitive pump, meeting operational requirements, and reducing cost and size.
Smart Images
Figure CN121573576A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of vehicles, in particular to an emergency hydraulic control system, a control method and a crane. BACKGROUND
[0002] In the hydraulic system of large-tonnage and super-large-tonnage all-terrain cranes, the up-and-down vehicle hydraulic system is generally arranged separately instead of sharing a hydraulic source through a central rotating body, so that the pipe loss caused by long pipes can be avoided, and the hydraulic systems of the traveling and operating parts can be ensured not to interfere with each other.
[0003] The operating conditions of large-tonnage cranes have very strict requirements on the time period of work. When the construction period exceeds the site requirements, great risks are brought to the safety of the constructors and the vehicles. For example, when wind blades are hoisted in a wind farm, the construction needs to be carried out when the wind level is relatively low. Once the construction time exceeds this period of time when the wind level is relatively low, the crane with the extended boom has a great risk of being blown over, and therefore, when the up-and-down vehicle operating part fails to retract the boom or the chassis traveling part fails to retract the outriggers, there is a risk of overturning, which brings great safety hazards to the constructors and the vehicles.
[0004] The existing wheel cranes lack emergency measures for the hydraulic system. The up-and-down vehicle is generally equipped with a power trolley for auxiliary operation, and the power source of the chassis is not connected to the up-and-down vehicle hydraulic system.
[0005] When the power trolley is used for emergency, the flow provided by the trolley is much smaller than the required flow of the up-and-down vehicle system, generally within 10%.
[0006] To increase the flow of the power trolley, the oil pump, oil tank and power of the prime mover of the trolley need to be increased. Whether it is a fuel engine or an electric motor, the cost and volume changes caused by the increase in power are significant.
[0007] In the prior art, the hydraulic oil sources are the same, and when an emergency is used, the oil pump may be empty, and the oil may be insufficient. The power sources of the hydraulic pumps are the same, and only the main pump or the hydraulic valve damage caused by the failure of the power source can be addressed. The emergency function is not complete, the working effect of the chassis load-sensitive hydraulic system cannot meet the requirements of the up-and-down vehicle operation, only the emergency of the chassis turning is provided, the outrigger extension and retraction during operation cannot be used in an emergency when the chassis power system fails, and the power trolley cannot provide emergency power for the up-and-down vehicle and the down vehicle at the same time. SUMMARY
[0008] The present application aims to overcome the deficiencies in the prior art, and provides an emergency hydraulic control system, a control method and a crane, wherein the upper and lower vehicle hydraulic sources are independent of each other, the chassis can provide emergency power to retract the outriggers by the power trolley, the displacement of the load sensing pump is always the maximum, the chassis provides emergency power to the upper vehicle, and the power trolley can provide emergency power to the chassis and the upper vehicle respectively.
[0009] To achieve the above object, the present application is implemented by the following technical scheme: In one aspect, the present application provides an emergency hydraulic control system, comprising a chassis emergency hydraulic system, a chassis hydraulic system, an upper vehicle emergency hydraulic system, an upper vehicle hydraulic system and a power trolley system. The chassis emergency hydraulic system comprises a chassis hydraulic transformer and an emergency switching valve, the chassis hydraulic system comprises an S1 hydraulic oil tank, an LS oil circuit comprising a load sensing pump and an outrigger telescopic actuator, the upper vehicle emergency system comprises an upper vehicle hydraulic transformer, the upper vehicle hydraulic system comprises an upper vehicle actuator and an S3 hydraulic oil tank, and the power trolley system comprises an S2 hydraulic oil tank and a power trolley. The power trolley sucks S2 hydraulic oil in the S2 hydraulic oil tank, supplies the S2 hydraulic oil to the chassis hydraulic transformer, the chassis hydraulic transformer sucks S1 hydraulic oil in the S1 hydraulic oil tank, supplies the S1 hydraulic oil to the outrigger control valve, and the outrigger control valve controls the outrigger telescopic actuator to act. The power trolley sucks S2 hydraulic oil in the S2 hydraulic oil tank, supplies the S2 hydraulic oil to the upper vehicle hydraulic transformer, the upper vehicle hydraulic transformer sucks S3 hydraulic oil in the S3 hydraulic oil tank, supplies the S3 hydraulic oil to the upper vehicle control valve, and the upper vehicle control valve controls the upper vehicle actuator to act. The load sensing pump sucks S1 hydraulic oil in the S1 hydraulic oil tank, supplies part of the S1 hydraulic oil to the LS oil circuit through the emergency switching valve, so that the load sensing pump is always in the maximum swing angle working state, supplies another part of the S1 hydraulic oil to the upper vehicle hydraulic transformer, the upper vehicle hydraulic transformer sucks S3 hydraulic oil in the S3 hydraulic oil tank, supplies the S3 hydraulic oil to the upper vehicle control valve, and the upper vehicle control valve controls the upper vehicle actuator to act.
[0010] Optionally, the power trolley and the chassis hydraulic transformer are connected through a first quick plug and a second quick plug, the power trolley and the upper vehicle hydraulic transformer are connected through the second quick plug and a third quick plug, and the chassis hydraulic transformer and the upper vehicle hydraulic transformer are connected through the third quick plug and a fourth quick plug.
[0011] Optionally, the present application further comprises a chassis power system, and the chassis power system comprises a diesel engine and a power take-off transmission shaft. The diesel engine drives the power take-off transmission shaft to supply power to the load sensing pump, and the load sensing pump sucks S1 hydraulic oil in the S1 hydraulic oil tank.
[0012] Optionally, the chassis hydraulic transformer and the upper vehicle hydraulic transformer are of the same structure, both comprising a large hydraulic motor and a small hydraulic motor rigidly connected with the large hydraulic motor; The power trolley sucks S2 hydraulic oil in the S2 hydraulic oil tank, supplies the S2 hydraulic oil to the large hydraulic motor in the chassis hydraulic transformer, returns the oil to the S2 hydraulic oil tank after the large hydraulic motor is unloaded, drives the small hydraulic motor connected with the large hydraulic motor to suck S1 hydraulic oil in the S1 hydraulic oil tank, supplies the S1 hydraulic oil to the outrigger control valve, controls the outrigger extension and retraction actuator to act, and returns the oil to the S1 hydraulic oil tank after the small hydraulic motor is unloaded; The power trolley sucks S2 hydraulic oil in the S2 hydraulic oil tank, supplies the S2 hydraulic oil to the large hydraulic motor in the chassis hydraulic transformer, returns the oil to the S2 hydraulic oil tank after the large hydraulic motor is unloaded, drives the small hydraulic motor connected with the large hydraulic motor to suck S1 hydraulic oil in the S1 hydraulic oil tank, supplies the S1 hydraulic oil to the outrigger control valve, controls the outrigger extension and retraction actuator to act, and returns the oil to the S1 hydraulic oil tank after the small hydraulic motor is unloaded; The load-sensitive pump sucks S1 hydraulic oil in the S1 hydraulic oil tank, supplies part of the S1 hydraulic oil to the LS oil circuit through the emergency switching valve, so that the load-sensitive pump is always in maximum swing angle operation; supplies another part of the S1 hydraulic oil to the large hydraulic motor in the upper vehicle hydraulic transformer, returns the oil to the S1 hydraulic oil tank after the large hydraulic motor is unloaded, drives the small hydraulic motor connected with the large hydraulic motor to suck S3 hydraulic oil in the S3 hydraulic oil tank, supplies the S3 hydraulic oil to the upper vehicle control valve, controls the upper vehicle actuator to act, and returns the oil to the S3 hydraulic oil tank after the small hydraulic motor is unloaded.
[0013] Optionally, the outrigger extension and retraction actuator comprises a horizontal oil cylinder and a vertical oil cylinder; The upper vehicle actuator comprises a slewing motor, a main winding motor, a secondary winding motor, an extension and retraction oil cylinder, and an amplitude changing oil cylinder.
[0014] Optionally, it further comprises a first check valve and a second check valve; The first check valve is installed at the output end of the load-sensitive pump and has the same output direction as the load-sensitive pump; The second check valve is installed at the output end of the chassis hydraulic transformer and has the same output direction as the chassis hydraulic transformer.
[0015] Optionally, the chassis hydraulic system further comprises a shuttle valve; The shuttle valve feeds back the action of the outrigger extension and retraction actuator to the load-sensitive pump in the LS oil circuit.
[0016] Optionally, the emergency switching valve is a two-position two-way switching valve.
[0017] In a second aspect, the present application provides a control method based on the emergency hydraulic control system of the first aspect, comprising: When the power trolley provides emergency power for the chassis, the power trolley absorbs S2 hydraulic oil in the S2 hydraulic oil tank, supplies the S2 hydraulic oil to the chassis hydraulic transformer, the chassis hydraulic transformer absorbs S1 hydraulic oil in the S1 hydraulic oil tank, supplies the S1 hydraulic oil to the outrigger control valve, and the outrigger control valve controls the outrigger extension actuator to act; When the power trolley provides emergency power for the upper vehicle, the power trolley absorbs S2 hydraulic oil in the S2 hydraulic oil tank, supplies the S2 hydraulic oil to the upper vehicle hydraulic transformer, the upper vehicle hydraulic transformer absorbs S3 hydraulic oil in the S3 hydraulic oil tank, supplies the S3 hydraulic oil to the upper vehicle control valve, and the upper vehicle control valve controls the upper vehicle actuator to act; When the chassis provides emergency power for the upper vehicle, the load sensing pump absorbs S1 hydraulic oil in the S1 hydraulic oil tank, supplies part of the S1 hydraulic oil to the LS oil circuit through the emergency switching valve, so that the load sensing pump is always in maximum swing angle operation, and supplies another part of the S1 hydraulic oil to the upper vehicle hydraulic transformer, the upper vehicle hydraulic transformer absorbs S3 hydraulic oil in the S3 hydraulic oil tank, supplies the S3 hydraulic oil to the upper vehicle control valve, and the upper vehicle control valve controls the upper vehicle actuator to act.
[0018] In a third aspect, the present application provides a crane comprising the emergency hydraulic control system of the first aspect.
[0019] Compared with the prior art, the present application has the following beneficial effects: The upper and lower vehicle hydraulic sources of the present application are independent of each other, the chassis can provide emergency power for the upper vehicle when the upper vehicle needs to be parked in an emergency, the engine of the chassis provides hydraulic power for the upper vehicle, the power trolley can provide emergency power for the upper vehicle hydraulic system in addition to providing emergency power for the chassis hydraulic system, one trolley serves two purposes, the power design of the hydraulic system is redundant, and safety is ensured in the scene where the construction period of a wind farm is strictly limited; the oil in the S1 hydraulic oil tank, the S2 hydraulic oil tank and the S3 hydraulic oil tank only runs in the respective hydraulic system, and cannot cause the oil tank to be sucked empty or the oil to overflow; for the hydraulic system of the chassis using a load sensing pump, the emergency switching valve is used to supply oil to the LS oil circuit, so that the displacement of the load sensing pump is always the maximum value, and the operation of the upper vehicle hydraulic emergency system is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 Fig. 1 shows a structural schematic diagram of the emergency hydraulic control system of the present application in an embodiment; Figure 2 Fig. 2 shows a flow schematic diagram of the emergency hydraulic control method of the present application in an embodiment; In the diagram: 1. Diesel engine; 2. First quick-connect fitting; 3. Power take-off drive shaft; 4. S2 hydraulic oil tank; 5. Power trolley; 6. S1 hydraulic oil tank; 7. Load-sensitive pump; 8. First check valve; 9. Emergency switching valve; 10. Steering, suspension and other hydraulic systems; 11. Shuttle valve; 12. Outrigger control valve; 13. Outrigger extension actuator; 14. Second quick-connect fitting; 15. Chassis hydraulic transformer; 16. Upper vehicle hydraulic transformer; 17. Third quick-connect fitting; 18. Second check valve; 19. Fourth quick-connect fitting; 20. Upper vehicle actuator; 21. Upper vehicle control valve; 22. S3 hydraulic oil tank. Detailed Implementation
[0021] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.
[0022] The term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0023] Example 1
[0024] like Figure 1 As shown in the figure, this embodiment introduces an emergency hydraulic control system, including a chassis emergency hydraulic system, a chassis hydraulic system, a chassis power system, a vehicle emergency hydraulic system, a vehicle hydraulic system, and a power trolley system.
[0025] The chassis emergency hydraulic system includes a first quick-connect valve 2, a second check valve 18, an emergency switching valve 9, and a chassis hydraulic transformer 15. The chassis hydraulic system includes an S1 hydraulic oil tank 6, an LS oil circuit containing a load-sensitive pump 7, other hydraulic systems such as steering and suspension 10, a shuttle valve 11, an outrigger control valve 12, an outrigger extension actuator 13, a first check valve 8, and a fourth quick-release valve 19. The outrigger extension actuator includes a horizontal cylinder and a vertical cylinder, which are responsible for controlling the extension and retraction of the outriggers, and are controlled by the outrigger control valve. The LS oil circuit containing the load-sensitive pump refers to the load-sensitive circuit, which is an existing circuit and will not be described in detail. The chassis power system includes a diesel engine 1, a power take-off port, and a drive shaft 3; The onboard emergency hydraulic system includes the onboard hydraulic transformer 16 and the third quick connector 17; The upper carriage hydraulic system comprises an upper carriage actuator 20, an upper carriage control valve 21 and an S3 hydraulic oil tank 22; the upper carriage actuator comprises a luffing cylinder, an extending and retracting cylinder, a slewing motor, a main winding motor and a secondary winding motor, and is controlled by the upper carriage control valve.
[0026] The power trolley system comprises an S2 hydraulic oil tank 4, a second quick connector 14 and a power trolley 5. The power trolley can use a diesel engine or an electric motor, and the electric motor can use a battery, a range-extending drive or direct plug-in power supply.
[0027] The chassis hydraulic transformer 15 and the upper carriage hydraulic transformer 16 have the same structure, and each comprises a large hydraulic motor and a small hydraulic motor rigidly connected to the large hydraulic motor through a shaft; the large hydraulic motor drives the small hydraulic motor to rotate, so as to achieve the effect of increasing the pressure and match the different pressures between the chassis, the upper carriage hydraulic system and the power trolley system.
[0028] The power trolley 5 sucks S2 hydraulic oil in the S2 hydraulic oil tank 4, and the S2 hydraulic oil enters the first quick connector 2 in the chassis emergency hydraulic system via the second quick connector 14, so as to supply the S2 hydraulic oil to the large hydraulic motor in the chassis hydraulic transformer 15; the oil returned to the S2 hydraulic oil tank 4 after the large hydraulic motor in the chassis hydraulic transformer 15 is unloaded includes the oil unloaded by the large hydraulic motor in the chassis hydraulic transformer and the S2 hydraulic oil. The large hydraulic motor in the chassis hydraulic transformer 15 drives the small hydraulic motor connected thereto to suck S1 hydraulic oil in the S1 hydraulic oil tank 6, and the S1 hydraulic oil passes through the second one-way valve 18 to supply the S1 hydraulic oil to the outrigger control valve 12; the outrigger control valve 12 controls the outrigger extending and retracting actuator 13 to act, and the oil returned to the S1 hydraulic oil tank 6 after the small hydraulic motor is unloaded includes the oil unloaded by the small hydraulic motor in the chassis hydraulic transformer and the S1 hydraulic oil; the S1 hydraulic oil can also be supplied to other hydraulic system actuators such as steering and suspension, which will not be described herein.
[0029] The power trolley 5 sucks S2 hydraulic oil in the S2 hydraulic oil tank 4, and the S2 hydraulic oil enters the third quick connector 17 in the upper carriage emergency hydraulic system via the second quick connector 14, so as to supply the S2 hydraulic oil to the large hydraulic motor in the upper carriage hydraulic transformer 16; the oil returned to the S2 hydraulic oil tank 4 after the large hydraulic motor in the upper carriage hydraulic transformer 16 is unloaded includes the oil unloaded by the large hydraulic motor in the upper carriage hydraulic transformer and the S2 hydraulic oil. The large hydraulic motor in the upper carriage hydraulic transformer 16 drives the small hydraulic motor connected thereto to suck S3 hydraulic oil in the S3 hydraulic oil tank 22, so as to supply the S3 hydraulic oil to the upper carriage control valve 21; the upper carriage control valve 21 controls the upper carriage actuator 20 to act, and the oil returned to the S3 hydraulic oil tank 22 after the small hydraulic motor is unloaded includes the oil unloaded by the small hydraulic motor in the upper carriage hydraulic transformer and the S3 hydraulic oil.
[0030] The power trolley can also suck S1 hydraulic oil in the S1 hydraulic oil tank to provide power for the superstructure, saving the hydraulic oil tank.
[0031] The diesel engine 1 drives the power take-off shaft 3 to supply power to the load sensing pump 7, which sucks S1 hydraulic oil in the S1 hydraulic oil tank 6. The S1 hydraulic oil passes through the first one-way valve 8 and supplies part of the S1 hydraulic oil to the LS oil circuit through the emergency switching valve 9, so that the load sensing pump 7 always works at the maximum swing angle. The emergency switching valve in this embodiment is a two-position two-way switching valve. Another part of the S1 hydraulic oil is supplied to the large hydraulic motor in the superstructure hydraulic transformer 16 through the fourth quick connector 19 and the third quick connector 17. After the large hydraulic motor in the superstructure hydraulic transformer 16 is unloaded, the oil returns to the S1 hydraulic oil tank 6. The oil includes the oil unloaded from the large hydraulic motor in the superstructure hydraulic transformer and the S1 hydraulic oil. The large hydraulic motor in the superstructure hydraulic transformer 16 drives the small hydraulic motor connected thereto to suck S3 hydraulic oil in the S3 hydraulic oil tank 22 and supply the S3 hydraulic oil to the superstructure control valve 21. The superstructure control valve 21 controls the action of the superstructure actuator 20. After the small hydraulic motor is unloaded, the oil returns to the S3 hydraulic oil tank 22. The oil includes the oil unloaded from the small hydraulic motor in the superstructure hydraulic transformer and the S3 hydraulic oil. The shuttle valve 11 feeds the action of the outrigger telescopic actuator 13 to the load sensing pump 7 in the LS oil circuit.
[0032] The load sensing pump serves multiple purposes. The emergency switching valve provides oil for the LS oil circuit, keeps the displacement of the load sensing pump always at the maximum value, realizes the maximum displacement working effect, meets the requirements of superstructure operation, and saves a LS oil circuit, pipeline and corresponding quick connector when the chassis provides power for the superstructure without returning the load pressure. When the chassis does not use the load sensing system, only the emergency switching valve needs to be cancelled, and the method of providing power by the hydraulic transformer as a whole does not change.
[0033] The emergency hydraulic system carried by the superstructure and the chassis does not affect the normal operation of the vehicle. Only when the vehicle fails or the hydraulic pump cannot provide hydraulic source, the system intervenes to ensure that the vehicle can perform emergency action. Each hydraulic system operates independently, and the hydraulic transformers are connected between the systems through quick connectors to avoid the exchange of oil between the systems.
[0034] Embodiment 2
[0035] Based on embodiment 1, this embodiment introduces a control method of an emergency hydraulic control system, including the following steps: When the power trolley provides emergency power for the chassis, the power trolley 5 drives the hydraulic pump inside it by the diesel engine or the battery, absorbs S2 hydraulic oil in the S2 hydraulic oil tank 4, and the S2 hydraulic oil enters the first quick connector 2 in the chassis emergency hydraulic system through the second quick connector 14, supplies S2 hydraulic oil to the large hydraulic motor in the chassis hydraulic transformer 15, and the large hydraulic motor in the chassis hydraulic transformer 15 returns the oil to the S2 hydraulic oil tank 4 after discharging the oil; the oil includes the oil discharged by the large hydraulic motor in the chassis hydraulic transformer and the S2 hydraulic oil; The large hydraulic motor in the chassis hydraulic transformer drives the small hydraulic motor connected to it to absorb S1 hydraulic oil in the S1 hydraulic oil tank 6, and the S1 hydraulic oil passes through the second one-way valve 18, supplies S1 hydraulic oil to the outrigger control valve 12 through the outrigger oil circuit, and the outrigger control valve 12 controls the horizontal cylinder and the vertical cylinder in the outrigger telescopic actuator 13 to act, and the small hydraulic motor returns the oil to the S1 hydraulic oil tank 6 after discharging the oil; the oil includes the oil discharged by the small hydraulic motor in the chassis hydraulic transformer and the S1 hydraulic oil; the S1 hydraulic oil can also supply the steering, suspension and other hydraulic system actuators, which are not described in this embodiment.
[0036] When the power trolley provides emergency power for the chassis, the first one-way valve 8 protects the load-sensitive pump 7, the emergency switching valve 9 does not act, and the third quick connector 17 and the fourth quick connector 19 are not connected.
[0037] When the power trolley provides emergency power for the upper car, the power trolley 5 drives the hydraulic pump inside it by the diesel engine or the battery, absorbs S2 hydraulic oil in the S2 hydraulic oil tank 4, and the S2 hydraulic oil enters the third quick connector 17 in the upper car emergency hydraulic system through the second quick connector 14, supplies S2 hydraulic oil to the large hydraulic motor in the upper car hydraulic transformer 16, and the large hydraulic motor in the upper car hydraulic transformer 16 returns the oil to the S2 hydraulic oil tank 4 after discharging the oil; the oil includes the oil discharged by the large hydraulic motor in the upper car hydraulic transformer and the S2 hydraulic oil; The large hydraulic motor in the upper car hydraulic transformer 16 drives the small hydraulic motor connected to it to absorb S3 hydraulic oil in the S3 hydraulic oil tank 22, supplies S3 hydraulic oil to the upper car control valve 21, and the upper car control valve 21 controls the amplitude cylinder, telescopic cylinder, rotary motor, main winding motor and auxiliary winding motor in the upper car actuator 20 to act, and the small hydraulic motor returns to the S3 hydraulic oil tank 22 after discharging the oil; the oil includes the oil discharged by the small hydraulic motor in the upper car hydraulic transformer and the S3 hydraulic oil.
[0038] When the power trolley provides emergency power for the upper car, the third quick connector 17 and the fourth quick connector 19 are not connected.
[0039] The power trolley can also absorb S1 hydraulic oil in the S1 hydraulic oil tank to provide power for the upper car, saving the hydraulic oil tank.
[0040] When the chassis provides emergency power to the upper car, the diesel engine 1 drives the power take-off shaft 3 to supply power to the load sensing pump 7, the load sensing pump 7 sucks S1 hydraulic oil in the S1 hydraulic oil tank 6, the S1 hydraulic oil passes through the first one-way valve 8, a part of the S1 hydraulic oil is supplied to the LS oil way through the emergency switching valve 9, so that the load sensing pump 7 is always in maximum swing angle operation; the emergency switching valve of the embodiment is a two-position two-way switching valve; Another part of the S1 hydraulic oil is supplied to the large hydraulic motor in the upper car hydraulic transformer 16 through the fourth quick connector 19 and the third quick connector 17, and the oil returned to the S1 hydraulic oil tank 6 after the large hydraulic motor in the upper car hydraulic transformer 16 is unloaded; the oil includes the oil unloaded from the large hydraulic motor in the upper car hydraulic transformer and the S1 hydraulic oil; The large hydraulic motor in the upper car hydraulic transformer 16 drives the small hydraulic motor connected thereto to suck S3 hydraulic oil in the S3 hydraulic oil tank 22, and supply the S3 hydraulic oil to the upper car control valve 21, the upper car control valve 21 controls the amplitude cylinder, telescopic cylinder, rotary motor, main winding motor and auxiliary winding motor in the upper car actuator 20 to act, and the oil returned to the S3 hydraulic oil tank 22 after the small hydraulic motor is unloaded; the oil includes the oil unloaded from the small hydraulic motor in the upper car hydraulic transformer and the S3 hydraulic oil; The shuttle valve 11 feeds the action of the outrigger telescopic actuator 13 to the load sensing pump 7 in the LS oil way.
[0041] When the chassis provides emergency power to the upper car, the second quick connector 14 and the third quick connector 17 are not connected, and the second quick connector 14 and the first quick connector 2 are not connected.
[0042] The pump of the chassis sucks hydraulic oil in the chassis hydraulic oil tank, which is only used to drive the larger displacement motor in the hydraulic transformer carried by the upper car, and the larger displacement motor returns the oil to the chassis hydraulic oil tank, the larger displacement motor is rigidly connected with a smaller displacement motor through a shaft, sucks hydraulic oil in the upper car hydraulic oil tank, and provides pressure oil to the upper car control valve and the actuator, and the oil returned to the upper car hydraulic oil tank by the smaller displacement motor, through the displacement change, the pressure can be raised and the two hydraulic systems can be independently operated, and other emergency conditions are similar.
[0043] In the embodiment, the chassis can provide emergency power for the upper vehicle, and the power trolley can provide emergency power for the chassis and the upper vehicle respectively, the three sets of emergency schemes are independent of each other, do not affect each other, and have safety redundancy; the power trolley system, the chassis hydraulic system and the upper vehicle hydraulic system can automatically match pressure in emergency, and do not need to be adjusted after being set during vehicle trial, and the emergency switching valve provides the flow required for control for the load sensing pump, and the constant pressure variable system does not need the emergency switching valve; the oil liquids between the systems are not interchanged, the oil liquids of the S1 hydraulic oil tank, the S2 hydraulic oil tank and the S3 hydraulic oil tank only run in the respective hydraulic systems, the hydraulic transformers between the systems are connected through quick insertion, the interchange of the oil liquids of the systems is avoided, and the oil tank is not sucked empty or the oil liquid is not overflowed; for the hydraulic system of the chassis using the load sensing pump, the emergency switching valve is used to supply oil for the LS oil way, and the operation of the upper vehicle hydraulic emergency system is ensured.
[0044] Embodiment 3
[0045] The embodiment introduces a crane including the emergency hydraulic control system described in embodiment 1.
[0046] The embodiments of the present application are described above with reference to the drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative but not restrictive, and those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and these all belong to the protection of the present application.
Claims
1. An emergency hydraulic control system, characterized in that, This includes the chassis emergency hydraulic system, chassis hydraulic system, upper vehicle emergency hydraulic system, upper vehicle hydraulic system, and power trolley system; The chassis emergency hydraulic system includes a chassis hydraulic transformer and an emergency switching valve. The chassis hydraulic system includes an S1 hydraulic oil tank, an LS oil circuit containing a load-sensitive pump, and a outrigger telescopic actuator. The upper vehicle emergency system includes an upper vehicle hydraulic transformer. The upper vehicle hydraulic system includes an upper vehicle actuator and an S3 hydraulic oil tank. The power trolley system includes an S2 hydraulic oil tank and a power trolley. The power trolley draws S2 hydraulic oil from the S2 hydraulic oil tank and supplies it to the chassis hydraulic transformer. The chassis hydraulic transformer draws S1 hydraulic oil from the S1 hydraulic oil tank and supplies it to the outrigger control valve. The outrigger control valve controls the movement of the outrigger extension and retraction actuator. The power trolley draws S2 hydraulic oil from the S2 hydraulic oil tank and supplies it to the upper hydraulic transformer. The upper hydraulic transformer draws S3 hydraulic oil from the S3 hydraulic oil tank and supplies it to the upper control valve. The upper control valve controls the movement of the upper actuator. The load-sensitive pump draws S1 hydraulic oil from the S1 hydraulic oil tank and supplies a portion of the S1 hydraulic oil to the LS oil circuit through the emergency switching valve, so that the load-sensitive pump is always working at its maximum swing angle. The other portion of the S1 hydraulic oil is supplied to the upper hydraulic transformer. The upper hydraulic transformer draws S3 hydraulic oil from the S3 hydraulic oil tank and supplies the S3 hydraulic oil to the upper control valve. The upper control valve controls the action of the upper actuator.
2. The emergency hydraulic control system according to claim 1, characterized in that, The power trolley is connected to the chassis hydraulic transformer via a first quick-connect and a second quick-connect, the power trolley is connected to the upper vehicle hydraulic transformer via a second quick-connect and a third quick-connect, and the chassis hydraulic transformer is connected to the upper vehicle hydraulic transformer via a third quick-connect and a fourth quick-connect.
3. The emergency hydraulic control system according to claim 1, characterized in that, It also includes a chassis power system, which includes a diesel engine and a power take-off drive shaft; The diesel engine drives the power take-off transmission shaft to supply power to the load-sensitive pump, which in turn draws hydraulic oil from the S1 hydraulic oil tank.
4. The emergency hydraulic control system according to claim 1, characterized in that, The chassis hydraulic transformer and the upper vehicle hydraulic transformer have the same structure, both including a large hydraulic motor and a small hydraulic motor rigidly connected to the large hydraulic motor. The power trolley draws S2 hydraulic oil from the S2 hydraulic oil tank and supplies it to the large hydraulic motor in the chassis hydraulic transformer. After the large hydraulic motor unloads the oil, the oil returns to the S2 hydraulic oil tank. The large hydraulic motor drives the small hydraulic motor connected to it to draw S1 hydraulic oil from the S1 hydraulic oil tank and supplies it to the outrigger control valve. The outrigger control valve controls the outrigger extension and retraction actuator. After the small hydraulic motor unloads the oil, the oil returns to the S1 hydraulic oil tank. The power trolley draws S2 hydraulic oil from the S2 hydraulic oil tank and supplies it to the large hydraulic motor in the upper hydraulic transformer. After the large hydraulic motor unloads the oil, the oil returns to the S2 hydraulic oil tank. The large hydraulic motor drives the small hydraulic motor connected to it to draw S3 hydraulic oil from the S3 hydraulic oil tank and supplies it to the upper control valve. The upper control valve controls the action of the upper actuator. After the small hydraulic motor unloads the oil, the oil returns to the S3 hydraulic oil tank. The load-sensitive pump draws S1 hydraulic oil from the S1 hydraulic oil tank and supplies a portion of it to the LS oil circuit through the emergency switching valve, ensuring the load-sensitive pump always operates at its maximum swing angle. The remaining portion of the S1 hydraulic oil is supplied to the large hydraulic motor in the upper hydraulic transformer. After the large hydraulic motor unloads its oil, the oil returns to the S1 hydraulic oil tank. The large hydraulic motor then drives a connected small hydraulic motor to draw S3 hydraulic oil from the S3 hydraulic oil tank and supplies it to the upper control valve. The upper control valve controls the upper actuator's movement. After the small hydraulic motor unloads its oil, the oil returns to the S3 hydraulic oil tank.
5. The emergency hydraulic control system according to claim 1, characterized in that, The outrigger extension mechanism includes a horizontal cylinder and a vertical cylinder, and the outrigger control valve controls the movement of the horizontal cylinder and the vertical cylinder in the outrigger extension mechanism. The upper carriage actuator includes a slewing motor, a main winding motor, an auxiliary winding motor, a telescopic cylinder, and a luffing cylinder. The upper carriage control valve controls the movement of the slewing motor, the main winding motor, the auxiliary winding motor, the telescopic cylinder, and the luffing cylinder in the upper carriage actuator.
6. The emergency hydraulic control system according to claim 1, characterized in that, It also includes a first check valve and a second check valve; The first check valve is installed at the output end of the load-sensitive pump, and its output direction is the same as that of the load-sensitive pump. The second one-way control valve is installed at the output end of the chassis hydraulic transformer, and is in the same direction as the output of the chassis hydraulic transformer.
7. The emergency hydraulic control system according to claim 1, characterized in that, The chassis hydraulic system also includes a shuttle valve; The shuttle valve feeds back the action of the outrigger extension actuator to the load-sensitive pump in the LS oil circuit.
8. The emergency hydraulic control system according to claim 1, characterized in that, The emergency switching valve is a two-position two-way switching valve.
9. A control method based on the emergency hydraulic control system according to any one of claims 1-8, characterized in that, include: When the power trolley provides emergency power to the chassis, the power trolley draws S2 hydraulic oil from the S2 hydraulic oil tank and supplies the S2 hydraulic oil to the chassis hydraulic transformer. The chassis hydraulic transformer draws S1 hydraulic oil from the S1 hydraulic oil tank and supplies the S1 hydraulic oil to the outrigger control valve. The outrigger control valve controls the action of the outrigger extension and retraction actuator. When the power trolley provides emergency power to the upper vehicle, the power trolley draws S2 hydraulic oil from the S2 hydraulic oil tank and supplies the S2 hydraulic oil to the upper vehicle hydraulic transformer. The upper vehicle hydraulic transformer draws S3 hydraulic oil from the S3 hydraulic oil tank and supplies the S3 hydraulic oil to the upper vehicle control valve. The upper vehicle control valve controls the action of the upper vehicle actuator. When the chassis provides emergency power to the upper vehicle, the load-sensitive pump draws S1 hydraulic oil from the S1 hydraulic oil tank and supplies a portion of the S1 hydraulic oil to the LS oil circuit through the emergency switching valve, so that the load-sensitive pump is always working at its maximum swing angle. The other portion of the S1 hydraulic oil is supplied to the upper vehicle hydraulic transformer. The upper vehicle hydraulic transformer draws S3 hydraulic oil from the S3 hydraulic oil tank and supplies the S3 hydraulic oil to the upper vehicle control valve. The upper vehicle control valve controls the action of the upper vehicle actuator.
10. A crane, characterized in that, Includes the emergency hydraulic control system as described in any one of claims 1-8.