CN114017405B - Emergency driving hydraulic system of rescue vehicle hoisting mechanical arm and driving method thereof - Google Patents
Emergency driving hydraulic system of rescue vehicle hoisting mechanical arm and driving method thereof Download PDFInfo
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- CN114017405B CN114017405B CN202111372004.9A CN202111372004A CN114017405B CN 114017405 B CN114017405 B CN 114017405B CN 202111372004 A CN202111372004 A CN 202111372004A CN 114017405 B CN114017405 B CN 114017405B
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/003—Systems with load-holding valves
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
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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
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- Fluid-Pressure Circuits (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
Abstract
The invention relates to an emergency driving hydraulic system of a lifting mechanical arm of a rescue vehicle and a driving method thereof. The invention can replace the original system to finish the functions of lifting, rotating, amplitude changing, fast/accurate lifting, speed reducing/emergency braking and the like of the crane under the condition of the fault of the original system, and meanwhile, the energy accumulator is arranged in the system, the energy accumulator not only has the absorption function on the pressure fluctuation generated in the working process of the equipment, but also can utilize the stored hydraulic energy to operate the crane under the condition that the adjustable variable hydraulic pump stops working, thereby further improving the reliability and the safety of the rescue vehicle.
Description
Technical Field
The invention belongs to the technical field of hydraulic systems, and particularly relates to an emergency driving hydraulic system of a lifting mechanical arm of a rescue vehicle and a driving method thereof.
Background
The safety redundancy of the hydraulic system is an important safety factor when the lifting equipment of the rescue vehicle is designed, and the redundancy design of the hydraulic system has important significance for improving the reliability of the rescue vehicle. Most of traditional emergency rescue vehicle hoisting systems are single hydraulic control systems, and when emergency situations occur in the operation process, although emergency can be stopped urgently to avoid danger, rescue operation can be delayed, and huge losses of life and property are caused. The invention relates to an emergency hoisting hydraulic system of a rescue vehicle, which can replace an original hydraulic system to continuously complete independent operation commands of lifting, turning, amplitude variation, quick lifting, second lifting, deceleration braking, emergency braking and the like of a mechanical arm by emergency starting under the condition that a hydraulic system of a hoisting device of the rescue vehicle breaks down; meanwhile, an energy accumulator designed in the system can perform the functions of lifting, rotating, amplitude changing, braking, sudden stop and the like for a plurality of times by utilizing the stored hydraulic energy under the condition that the hydraulic pump station is in complete failure, so that the reliability and the safety of the system are further improved.
Disclosure of Invention
Aiming at the situations, the invention provides an emergency driving hydraulic system of a lifting mechanical arm of a rescue vehicle and a driving method thereof, a redundant hydraulic control system is provided for the lifting system of the rescue vehicle, and under the condition of the failure of the original system, the emergency driving hydraulic system can be started to replace the original system to complete the functions of lifting, rotation, amplitude variation, quick/accurate lifting, speed reduction/emergency braking and the like, so that the reliability and the safety of the rescue vehicle are further improved.
The invention adopts the technical scheme that the emergency driving hydraulic system of the lifting mechanical arm of the rescue vehicle comprises a main hydraulic oil circuit, a mechanical arm telescopic circuit, a first lifting circuit, a mechanical arm lifting circuit, a second lifting circuit, a deceleration braking oil circuit and an emergency braking oil circuit, wherein the mechanical arm telescopic circuit, the first lifting circuit, the mechanical arm lifting circuit, the second lifting circuit, the deceleration braking oil circuit and the emergency braking oil circuit are all communicated with the main hydraulic oil circuit; the mechanical arm telescopic loop comprises a first electromagnetic directional valve, a second electromagnetic directional valve, a first hydraulic directional valve and a mechanical arm telescopic hydraulic cylinder, the first oil port of the first electromagnetic directional valve, the first oil port of the second electromagnetic directional valve and the first oil port of the first hydraulic directional valve are communicated with the main oil outlet of the main hydraulic oil path, and the second oil port of the first electromagnetic directional valve is communicated with the left control oil port of the first hydraulic directional valve, a second oil port of the second electromagnetic directional valve is communicated with a right control oil port of the first hydraulic directional valve, and the second oil port and the third oil port of the first hydraulic reversing valve are respectively communicated with the rodless cavity and the rod cavity of the mechanical arm telescopic hydraulic cylinder, oil outlets of the first electromagnetic reversing valve, the second electromagnetic reversing valve and the first hydraulic reversing valve are communicated with an oil tank; the first lifting loop comprises a third electromagnetic directional valve, a fourth electromagnetic directional valve, a second hydraulic directional valve and a first lifting hydraulic motor, the first oil port of the third electromagnetic directional valve, the first oil port of the fourth electromagnetic directional valve and the first oil port of the second hydraulic directional valve are communicated with the main oil outlet of the main hydraulic oil way, and the second oil port of the third electromagnetic directional valve is communicated with the left control oil port of the second hydraulic directional valve, a second oil port of the fourth electromagnetic directional valve is communicated with a right control oil port of the second hydraulic directional valve, and the second oil port and the third oil port of the second hydraulic directional control valve are respectively communicated with the first oil port and the second oil port of the first hydraulic motor, oil outlets of the third electromagnetic directional valve, the fourth electromagnetic directional valve and the second hydraulic directional valve are communicated with an oil tank; the mechanical arm lifting loop comprises a sixth electromagnetic directional valve, a seventh electromagnetic directional valve, a second one-way throttle valve, a third one-way throttle valve, a first hydraulic control one-way valve, a second hydraulic control one-way valve and a mechanical arm lifting hydraulic cylinder, a first oil port of the sixth electromagnetic directional valve and a first oil port of the seventh electromagnetic directional valve are both communicated with a main oil outlet of the main hydraulic oil circuit, a second oil port of the sixth electromagnetic directional valve and a second oil port of the seventh electromagnetic directional valve are both communicated with an oil tank, a third oil port of the sixth electromagnetic directional valve is communicated with a rodless cavity of the mechanical arm lifting hydraulic cylinder through the second one-way throttle valve and the first hydraulic control one-way valve, a third oil port of the seventh electromagnetic directional valve is communicated with a rod cavity of the mechanical arm lifting hydraulic cylinder through the third one-way throttle valve and the second hydraulic control one-way valve, the first hydraulic control one-way valve, the second one-way throttle valve and the third one-way throttle valve jointly form a first hydraulic lock valve group, a hydraulic control oil port of the first hydraulic control one-way valve is communicated with an oil outlet of the third one-way throttle valve, and a hydraulic control oil port of the second hydraulic control one-way valve is communicated with an oil outlet of the second one-way throttle valve; the second hoisting loop comprises an eighth electromagnetic directional valve, a ninth electromagnetic directional valve, a fourth one-way throttle valve, a fifth one-way throttle valve, a third hydraulic control one-way valve, a fourth hydraulic control one-way valve and a second hoisting motor, a first oil port of the eighth electromagnetic directional valve and a first oil port of the ninth electromagnetic directional valve are both communicated with the main oil outlet of the main hydraulic oil circuit, a second oil port of the eighth electromagnetic directional valve and a second oil port of the ninth electromagnetic directional valve are both communicated with an oil tank, a third oil port of the eighth electromagnetic directional valve is communicated with the first oil port of the second hoisting motor through the fourth one-way throttle valve and the third hydraulic control one-way valve, a third oil port of the ninth electromagnetic directional valve is communicated with the second oil port of the second hoisting motor through the fifth one-way throttle valve and the fourth hydraulic control one-way valve, and the fourth one-way throttle valve is communicated with the second oil port of the second hoisting motor, The fifth one-way throttle valve, the third hydraulic control one-way valve and the fourth hydraulic control one-way valve form a second hydraulic lock valve group together, a hydraulic control oil port of the third hydraulic control one-way valve is communicated with an oil outlet of the fifth one-way throttle valve, and a hydraulic control oil port of the fourth hydraulic control one-way valve is communicated with an oil outlet of the fourth one-way throttle valve.
Furthermore, the main hydraulic oil path comprises an oil tank, an adjustable variable hydraulic pump, a first one-way valve and a filter, wherein an oil inlet of the adjustable variable hydraulic pump is connected with the oil tank, and an oil outlet of the adjustable variable hydraulic pump is communicated with the mechanical arm telescopic loop, the first hoisting loop, the mechanical arm lifting loop, the second hoisting loop, the deceleration braking oil path and the emergency braking oil path through the first one-way valve and the filter.
The emergency braking oil path comprises a fifth electromagnetic directional valve, a first one-way throttle valve and an emergency braking hydraulic cylinder, a first oil port of the fifth electromagnetic directional valve is communicated with a main oil outlet of the main hydraulic oil path, a second oil port of the fifth electromagnetic directional valve is communicated with an oil tank, and a third oil port of the fifth electromagnetic directional valve is communicated with a rod cavity of the emergency braking hydraulic cylinder through the first one-way throttle valve.
The hydraulic control system comprises a hydraulic control system, a hydraulic control system and a speed-reducing brake system, and is characterized by further comprising a speed-reducing brake oil way, wherein the speed-reducing brake oil way comprises a tenth electromagnetic directional valve, a sixth one-way throttle valve and a speed-reducing brake hydraulic cylinder, a first oil port of the tenth electromagnetic directional valve is communicated with a main oil outlet of the main hydraulic oil way, a second oil port of the tenth electromagnetic directional valve is communicated with an oil tank, and a third oil port of the tenth electromagnetic directional valve is communicated with a rod cavity of the speed-reducing brake hydraulic cylinder through the sixth one-way throttle valve.
Preferably, an accumulator is further arranged at an outlet of the filter, and the accumulator can reduce the influence of oil pressure fluctuation on the emergency driving hydraulic system in the working process of the emergency driving hydraulic system.
Preferably, the first electromagnetic directional valve, the second electromagnetic directional valve, the third electromagnetic directional valve, the fourth electromagnetic directional valve, the fifth electromagnetic directional valve, the sixth electromagnetic directional valve, the seventh electromagnetic directional valve, the eighth electromagnetic directional valve, the ninth electromagnetic directional valve and the tenth electromagnetic directional valve are two-position four-way electromagnetic valves.
Preferably, the first hydraulic directional control valve and the second hydraulic directional control valve are three-position four-way directional control valves.
In another aspect of the present invention, a driving method for an emergency driving hydraulic system of a lifting mechanical arm of a rescue vehicle is provided, which includes the following steps:
s1, when the mechanical arm lifts, the sixth electromagnetic directional valve is powered on, the sixth electromagnetic directional valve is communicated with the left position, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil flows into a left oil way of the first hydraulic lock valve group through the first one-way valve, the filter and the sixth electromagnetic directional valve, and then the rodless cavity of the mechanical arm lifting hydraulic cylinder is supplied with oil, so that the mechanical arm lifting operation is realized;
s2, when the mechanical arm descends, the seventh electromagnetic directional valve is powered on, the left position of the seventh electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil flows into a right oil way of the first hydraulic lock valve group through the first one-way valve, the filter and the seventh electromagnetic directional valve, and then the oil is supplied to a rod cavity of the mechanical arm lifting hydraulic cylinder, so that the mechanical arm descends;
s3, when the mechanical arm stretches out, the first electromagnetic directional valve is powered on, the left position of the first electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil passes through the first one-way valve, the filter and the first electromagnetic directional valve, so that the first hydraulic directional valve is controlled to be switched to the left position, and at the moment, the hydraulic oil flows into a rodless cavity of the mechanical arm telescopic hydraulic cylinder through the first hydraulic directional valve, so that the mechanical arm stretches out;
s4, when the mechanical arm retracts, the first electromagnetic directional valve is powered off, the second electromagnetic directional valve is powered on, the left position of the second electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil passes through the first one-way valve, the filter and the second electromagnetic directional valve, so that the first hydraulic directional valve is controlled to be switched to the right position, and at the moment, the hydraulic oil flows into a rod cavity of the mechanical arm telescopic hydraulic cylinder through the first hydraulic directional valve, so that the mechanical arm retracts;
s5, when the rapid lifting operation is carried out, the third electromagnetic directional valve is electrified, the left position of the third electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil passes through the first one-way valve, the filter and the third electromagnetic directional valve, so that the second hydraulic directional valve is controlled to be switched to the left position, the hydraulic oil flows into the first oil port of the first lifting motor through the second hydraulic directional valve, the first lifting motor rotates positively, and the rapid lifting operation is realized;
s6, when the rapid hoisting and descending operation is carried out, the third electromagnetic directional valve is powered off, the fourth electromagnetic directional valve is powered on, the left position of the fourth electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil passes through the first one-way valve, the filter and the fourth electromagnetic directional valve, so that the second hydraulic directional valve is controlled to be switched to the right position, the hydraulic oil flows into the second oil port of the first hoisting motor through the second hydraulic directional valve at the moment, the first hoisting motor rotates reversely, and the rapid hoisting and descending operation is realized;
s7, when the second hoisting operation is carried out, the eighth electromagnetic directional valve is powered on, the left position of the eighth electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil flows into a left oil way of the second hydraulic lock valve group through the first check valve, the filter and the eighth electromagnetic directional valve, and then the first oil port of the second hoisting motor is supplied with the hydraulic oil, and the second hoisting motor rotates forwards to realize the second hoisting operation;
s8, when the second hoisting and descending operation is carried out, the eighth electromagnetic directional valve is powered off, the ninth electromagnetic directional valve is powered on, the left position of the ninth electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil flows into a right oil way of the second hydraulic lock valve group through the first one-way valve, the filter and the ninth electromagnetic directional valve, and then oil is supplied to a second oil port of the second hoisting motor, and the second hoisting motor rotates reversely to realize the second hoisting and descending operation;
s9, when the mechanical arm performs deceleration braking operation in the hoisting process, the tenth electromagnetic directional valve is powered on, the left position of the tenth electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, and the hydraulic oil supplies oil to the deceleration braking hydraulic cylinder through the first one-way valve, the filter, the tenth electromagnetic directional valve and the sixth one-way throttle valve to realize deceleration braking operation;
s10, when the mechanical arm carries out emergency braking operation in the hoisting process, the fifth electromagnetic directional valve is electrified, the left position of the fifth electromagnetic directional valve is communicated, the variable hydraulic pump extracts hydraulic oil from the oil tank, and the hydraulic oil passes through the first one-way valve, the filter, the fifth electromagnetic directional valve and the first one-way throttle valve and supplies oil to the emergency braking hydraulic cylinder to realize emergency braking operation;
s11, when the adjustable variable hydraulic pump is damaged, the accumulator can store hydraulic energy while absorbing pressure fluctuation of the emergency driving hydraulic system, and the starting and stopping of the emergency braking hydraulic cylinder can be met. And the hydraulic oil stored in the energy accumulator is supplied to the emergency braking hydraulic cylinder through the fifth electromagnetic directional valve and the first one-way throttle valve, so that the emergency braking operation is realized.
The invention has the characteristics and beneficial effects that:
1. the emergency driving hydraulic system of the rescue vehicle hoisting mechanical arm and the driving method thereof provided by the invention provide a redundant hydraulic control system for the rescue vehicle hoisting system, and under the condition of pipeline failure of the original system, the emergency driving hydraulic system can be started to replace the original system to complete the functions of hoisting, rotation, amplitude variation, fast/second hoisting, speed reduction/emergency braking and the like, so that the reliability and the safety of the rescue vehicle are further improved.
2. According to the emergency driving hydraulic system of the rescue vehicle lifting mechanical arm and the driving method thereof, the energy accumulator is arranged in the system, and the energy accumulator has an absorption effect on pressure fluctuation generated in the working process of equipment, so that the pressure stability of the hydraulic system is ensured. Meanwhile, the energy accumulator can utilize the stored hydraulic energy to carry out operation commands such as lifting, rotating, amplitude changing, braking, emergency stopping and the like for a plurality of times under the condition that the adjustable variable hydraulic pump stops working, and the reliability of the system under the limit condition is further improved.
3. According to the emergency driving hydraulic system and the driving method of the rescue vehicle hoisting mechanical arm, the emergency driving function of the hoisting mechanical arm is realized by adding part of hydraulic elements on the basis of the original hydraulic system, and the emergency driving hydraulic system has the advantages of simple structure, quickness in starting, easiness in integration and engineering and the like.
Drawings
Fig. 1 is a hydraulic schematic diagram of an emergency driving hydraulic system of a lifting mechanical arm of a rescue vehicle;
FIG. 2 is a schematic view of the telescoping circuit of the robot arm of the present invention;
fig. 3 is a schematic view of a throttling bidirectional locking loop in a mechanical arm lifting loop.
The main reference numbers:
1. an oil tank; 2. an adjustable variable hydraulic pump; 3. a first check valve; 4. a filter; 5. an overflow valve; 6. a first electromagnetic directional valve; 7. a second electromagnetic directional valve; 8. a first hydraulically operated directional control valve; 9. a mechanical arm telescopic hydraulic cylinder; 10. a third electromagnetic directional valve; 11. a fourth electromagnetic directional valve; 12. a second hydraulic directional control valve; 13. a first lift motor; 14. an accumulator; 15. a fifth electromagnetic directional valve; 16. a first one-way throttle valve; 17. an emergency braking hydraulic cylinder; 18. a sixth electromagnetic directional valve; 19. a seventh electromagnetic directional valve; 20. a second one-way throttle valve; 21. a third one-way throttle valve; 22. a first hydraulic lock valve bank; 23. a first hydraulic control check valve; 24. a second hydraulic control one-way valve; 25. a mechanical arm lifting hydraulic cylinder; 26. an eighth electromagnetic directional valve; 27. a ninth electromagnetic directional valve; 28. a fourth one-way throttle valve; 29. a fifth one-way throttle valve; 30. a third hydraulic control check valve; 31. a fourth hydraulic control check valve; 32. a second hydraulic lock valve bank; 33. a second hoist motor; 34. a tenth electromagnetic directional valve; 35. a sixth one-way throttle valve; 36. and a deceleration braking hydraulic cylinder.
Detailed Description
The technical contents, structural features, attained objects and effects of the present invention are explained in detail below with reference to the accompanying drawings.
The invention provides an emergency driving hydraulic system of a rescue vehicle hoisting mechanical arm, which comprises a main hydraulic oil circuit, a mechanical arm telescopic circuit, a first hoisting circuit, namely a quick hoisting circuit, a mechanical arm lifting circuit, a second hoisting circuit, namely a precise hoisting circuit, a deceleration braking oil circuit and an emergency braking oil circuit, wherein the mechanical arm telescopic circuit, the first hoisting circuit, the mechanical arm lifting circuit, the second hoisting circuit, the deceleration braking oil circuit and the emergency braking oil circuit are all communicated with the main hydraulic oil circuit. The main hydraulic oil path comprises an oil tank 1, an adjustable variable hydraulic pump 2, a first one-way valve 3 and a filter 4, an oil inlet of the adjustable variable hydraulic pump 2 is connected with the oil tank 1, and an oil outlet of the adjustable variable hydraulic pump 2 is communicated with a mechanical arm telescopic loop, a first hoisting loop, a mechanical arm lifting loop, a second hoisting loop, a deceleration braking oil path and an emergency braking oil path through the first one-way valve 3 and the filter 4.
In fig. 1, the original hydraulic system of the mechanical arm of the rescue vehicle crane mainly comprises an oil tank 1, an adjustable variable hydraulic pump 2, a first check valve 3, a filter 4, an overflow valve 5, a mechanical arm lifting hydraulic cylinder 25, a mechanical arm telescopic hydraulic cylinder 9, a first hoisting motor 13, a second hoisting motor 33, a deceleration brake hydraulic cylinder 36 and an emergency brake hydraulic cylinder 17. Under the condition of pipeline failure of the original hydraulic system, the emergency driving hydraulic system can be started to replace the original hydraulic system to complete the functions of lifting, rotating, amplitude changing, quick/accurate lifting, speed reduction/emergency braking and the like.
As shown in fig. 1 and 2, the mechanical arm telescopic loop comprises a first electromagnetic directional valve 6, a second electromagnetic directional valve 7, a first hydraulic directional valve 8 and a mechanical arm telescopic hydraulic cylinder 9, wherein the first electromagnetic directional valve 6 and the second electromagnetic directional valve 7 are two-position four-way electromagnetic valves, the first hydraulic directional valve 8 is a three-position four-way directional valve, a first port P of the first electromagnetic directional valve 6, a first port P of the second electromagnetic directional valve 7 and a first port P of the first hydraulic directional valve 8 are all communicated with a main oil outlet of a main hydraulic oil circuit, a second port a of the first electromagnetic directional valve 6 is communicated with a left control port K1 of the first hydraulic directional valve 8, a second port a of the second electromagnetic directional valve 7 is communicated with a right control port K2 of the first hydraulic directional valve 8, and a second port a and a third port B of the first hydraulic directional valve 8 are respectively communicated with a rodless cavity and a rod cavity of the mechanical arm telescopic hydraulic cylinder 9, oil outlets T of the first electromagnetic reversing valve 6, the second electromagnetic reversing valve 7 and the first hydraulic reversing valve 8 are communicated with the oil tank 1. The adjustable variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, and the hydraulic oil flows to oil inlets of the first electromagnetic directional valve 6 and the second electromagnetic directional valve 7 through the first one-way valve 3 and the filter 4, so that the transposition of the first hydraulic directional valve 8 is controlled, and the telescopic motion of the mechanical arm telescopic hydraulic cylinder 9 is realized.
For a mechanical arm telescopic loop, an original hydraulic telescopic system cannot fully utilize energy, and cannot eliminate a series of impacts generated by the system and cause irreversible damage to system elements. And the mechanical arm telescopic loop in the emergency driving hydraulic system comprises an energy accumulator 14 as shown in fig. 3, so that the hydraulic loop can fully recycle energy and absorb impact generated by the system, thereby protecting the system. The accumulator 14 plays an important role as an auxiliary power source and an emergency power source, and when the original pump source cannot provide oil, the accumulator 14 can supply the stored oil to the system in an emergency, so that the system can work normally and can be stopped slowly and safely.
As shown in fig. 1, the first lifting loop includes a third electromagnetic directional valve 10, a fourth electromagnetic directional valve 11, a second hydraulic directional valve 12 and a first lifting hydraulic motor 13, the third electromagnetic directional valve 10 and the fourth electromagnetic directional valve 11 are two-position four-way electromagnetic valves, the second hydraulic directional valve 12 is a three-position four-way directional valve, a first port P of the third electromagnetic directional valve 10, a first port P of the fourth electromagnetic directional valve 11 and a first port P of the second hydraulic directional valve 12 are all communicated with a main oil outlet of the main hydraulic oil circuit, a second port a of the third electromagnetic directional valve 10 is communicated with a left control port K1 of the second hydraulic directional valve 12, a second port a of the fourth electromagnetic directional valve 11 is communicated with a right control port K2 of the second hydraulic directional valve 12, and a second port a and a third port B of the second hydraulic directional valve 12 are respectively communicated with a first port and a second port of the first lifting hydraulic motor 13, oil outlets T of the third electromagnetic directional valve 10, the fourth electromagnetic directional valve 11 and the second hydraulic directional valve 12 are all communicated with the oil tank 1. The adjustable variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, and the hydraulic oil flows to oil inlets of the third electromagnetic directional valve 10 and the fourth electromagnetic directional valve 11 through the first one-way valve 3 and the filter 4, so that the transposition of the second hydraulic directional valve 12 is controlled, and the lifting movement of the mechanical arm is further realized.
As shown in fig. 1 and 3, the mechanical arm lifting loop includes a sixth electromagnetic directional valve 18, a seventh electromagnetic directional valve 19, a second one-way throttle valve 20, a third one-way throttle valve 21, a first hydraulic control one-way valve 23, a second hydraulic control one-way valve 24 and a mechanical arm lifting hydraulic cylinder 25, the sixth electromagnetic directional valve 18 and the seventh electromagnetic directional valve 19 are two-position four-way electromagnetic valves, a first port P of the sixth electromagnetic directional valve 18 and a first port P of the seventh electromagnetic directional valve 19 are both communicated with a main oil outlet of the main hydraulic oil circuit, a second port T of the sixth electromagnetic directional valve 18 and a second port T of the seventh electromagnetic directional valve 19 are both communicated with the oil tank 1, a third port a of the sixth electromagnetic directional valve 18 is communicated with a rodless cavity of the mechanical arm lifting hydraulic cylinder 25 through the second one-way throttle valve 20 and the first hydraulic control one-way valve 23, a third port a of the seventh electromagnetic directional valve 19 is communicated with an oil port a rodless cavity of the mechanical arm lifting hydraulic cylinder 25 through the third one-way throttle valve 21 and the second hydraulic control one-way valve 24 The rod cavities are communicated, the first hydraulic control one-way valve 23, the second hydraulic control one-way valve 24, the second one-way throttle valve 20 and the third one-way throttle valve 21 jointly form a first hydraulic lock valve group 22, a hydraulic control oil port D of the first hydraulic control one-way valve 23 is communicated with an oil outlet C of the third one-way throttle valve 21, and a hydraulic control oil port D of the second hydraulic control one-way valve 24 is communicated with an oil outlet C of the second one-way throttle valve 20. The adjustable variable flow hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil flows to oil inlets of the sixth electromagnetic directional valve 18 and the seventh electromagnetic directional valve 19 through the first check valve 3 and the filter 4, and is supplied to the mechanical arm lifting hydraulic cylinder 25 through the first hydraulic lock valve group 22, so that the lifting movement of the mechanical arm is realized. When the mechanical arm lifting hydraulic cylinder 25 pushes forwards, the oil outlet C of the second one-way throttle valve 20 has pressure, at this time, the pressure of the hydraulic control oil port D of the second hydraulic control one-way valve 24 is equal to the pressure of the point C, at this time, the valve port is opened by the second hydraulic control one-way valve 24, reverse circulation is performed, and hydraulic oil in the rod cavity of the mechanical arm lifting hydraulic cylinder 25 flows into the oil tank 1 through the third one-way throttle valve 21. When the pressure at the point C of the oil outlet of the second one-way throttle valve 20 is zero, the pressure of the hydraulic control port D of the second hydraulic control one-way valve 24 is also zero, and at this time, the second hydraulic control one-way valve and the common one-way valve have the same function and can only perform one-way circulation.
For a mechanical arm lifting loop, an original hydraulic lifting system cannot realize sensitive adjustment of lifting speed, and cannot meet the requirement of stopping lifting at a required position. And the mechanical arm lifting loop designed by the emergency driving hydraulic system, wherein the first hydraulic lock valve group 22 can realize that the mechanical arm stops at a required position, and meanwhile, the mechanical arm lifting hydraulic cylinder 25 can be prevented from moving after stopping, so that the stability, the safety and the reliability of the system are ensured. Meanwhile, the second one-way throttle valve 20 and the third one-way throttle valve 21 are respectively arranged on an oil inlet path and an oil return path of the mechanical arm lifting hydraulic cylinder 25, so that real-time sensitive adjustment of the lifting speed of the mechanical arm can be realized, and the usability and the efficiency of the system are improved.
As shown in fig. 1, the second hoisting loop includes an eighth electromagnetic directional valve 26, a ninth electromagnetic directional valve 27, a fourth one-way throttle valve 28, a fifth one-way throttle valve 29, a third hydraulic control one-way valve 30, a fourth hydraulic control one-way valve 31 and a second hoisting motor 33, the eighth electromagnetic directional valve 26 and the ninth electromagnetic directional valve 27 are two-position four-way electromagnetic valves, a first port P of the eighth electromagnetic directional valve 26 and a first port P of the ninth electromagnetic directional valve 27 are both communicated with a main oil outlet of the main hydraulic oil circuit, a second port T of the eighth electromagnetic directional valve 26 and a second port T of the ninth electromagnetic directional valve 27 are both communicated with the oil tank 1, a third port a of the eighth electromagnetic directional valve 26 is communicated with a first port of the second hoisting motor 33 through the fourth one-way throttle valve 28 and the third hydraulic control one-way valve 30, a third port a of the ninth electromagnetic directional valve 27 is communicated with a second port of the second hoisting motor 33 through the fifth one-way throttle valve 29 and the fourth hydraulic control one-way valve 31, and the fourth one-way throttle valve 28, the fifth one-way throttle valve 29, the third hydraulic control one-way valve 30 and the fourth hydraulic control one-way valve 31 jointly form a second hydraulic lock valve group 32, a hydraulic control port of the third hydraulic control one-way valve 30 is communicated with an oil outlet of the fifth one-way throttle valve 29, and a hydraulic control port of the fourth hydraulic control one-way valve 31 is communicated with an oil outlet of the fourth one-way throttle valve 28. The adjustable variable hydraulic pump 2 extracts hydraulic oil from an oil tank, the hydraulic oil flows to oil inlets of the eighth electromagnetic directional valve 26 and the ninth electromagnetic directional valve 27 through the first check valve 3 and the filter 4, and is supplied to the second hoisting motor 33 through the second hydraulic lock valve group 32, so that second hoisting movement of the crane is realized.
In a preferable mode, the emergency braking oil path is further included, the emergency braking oil path includes a fifth electromagnetic directional valve 15, a first one-way throttle valve 16 and an emergency braking hydraulic cylinder 17, the fifth electromagnetic directional valve 15 is a two-position four-way electromagnetic valve, a first oil port P of the fifth electromagnetic directional valve 15 is communicated with a main oil outlet of the main hydraulic oil path, a second oil port T of the fifth electromagnetic directional valve 15 is communicated with the oil tank 1, and a third oil port a of the fifth electromagnetic directional valve 15 is communicated with a rod cavity of the emergency braking hydraulic cylinder 17 through the first one-way throttle valve 16. The adjustable variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil flows to an oil inlet of the fifth electromagnetic directional valve 15 through the first one-way valve 3 and the filter 4, and then is supplied to the emergency brake hydraulic cylinder 17 through the first one-way throttle valve 16, so that the emergency brake movement of the crane is realized.
In a preferable mode, the deceleration braking oil path is further included, and the deceleration braking oil path includes a tenth electromagnetic directional valve 34, a sixth one-way throttle valve 35 and a deceleration braking hydraulic cylinder 36, the tenth electromagnetic directional valve 34 is a two-position four-way electromagnetic valve, a first oil port P of the tenth electromagnetic directional valve 34 is communicated with a main oil outlet of the main hydraulic oil path, a second oil port T of the tenth electromagnetic directional valve 34 is communicated with the oil tank 1, and a third oil port a of the tenth electromagnetic directional valve 34 is communicated with a rod cavity of the deceleration braking hydraulic cylinder 36 through the sixth one-way throttle valve 35. The variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil flows to an oil inlet of the tenth electromagnetic directional valve 34 through the first one-way valve 3 and the filter 4, and then is supplied to the deceleration brake hydraulic cylinder 36 through the sixth one-way throttle valve 35, so that the deceleration brake movement of the crane is realized.
Preferably, an accumulator 14 is further arranged at the outlet of the filter 4, and the accumulator 14 can reduce the influence of oil pressure fluctuation on the emergency driving hydraulic system during the working process of the emergency driving hydraulic system. The overflow valve 5 connects the oil outlet of the filter 4 with the oil tank 1, and overload protection of the whole system can be realized.
In a second aspect of the present invention, an emergency driving method for an emergency driving hydraulic system of a lifting arm of a rescue vehicle is provided, which includes the following steps:
s1, when the mechanical arm lifts, the sixth electromagnetic directional valve 18 is powered on, the sixth electromagnetic directional valve 18 is communicated in the left position, the variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil flows into a left oil way of the first hydraulic lock valve group 22 through the first one-way valve 3, the filter 4 and the sixth electromagnetic directional valve 18, oil supply is further carried out on a rodless cavity of the mechanical arm lifting hydraulic cylinder 25, the lifting operation of the mechanical arm is achieved, the speed of the lifting operation of the mechanical arm can be adjusted by adjusting the second one-way throttle valve 20, and therefore the mechanical arm is lifted to the specified position accurately.
S2, when the mechanical arm descends, the seventh electromagnetic directional valve 19 is powered on, the seventh electromagnetic directional valve 19 is communicated with the left position, the variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil flows into a right oil way of the first hydraulic lock valve group 22 through the first check valve 3, the filter 4 and the seventh electromagnetic directional valve 19, oil is further supplied to a rod cavity of the mechanical arm lifting hydraulic cylinder 25, descending operation of the mechanical arm is achieved, speed adjustment of descending operation of the mechanical arm can be achieved by adjusting the third check throttle valve 21, and therefore the mechanical arm descends to a specified position accurately.
S3, when the mechanical arm stretches out, the first electromagnetic directional valve 6 is powered on, the left position of the first electromagnetic directional valve 6 is communicated, the variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil passes through the first one-way valve 3, the filter 4 and the first electromagnetic directional valve 6, the first hydraulic directional valve 8 is controlled to be switched to the left position, and at the moment, the hydraulic oil flows into a rodless cavity of the mechanical arm telescopic hydraulic cylinder 9 through the first hydraulic directional valve 8, so that the mechanical arm stretching operation is realized.
S4, when the mechanical arm retracts, the first electromagnetic directional valve 6 is powered off, the second electromagnetic directional valve 7 is powered on, the left position of the second electromagnetic directional valve 7 is communicated, the adjustable variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil passes through the first one-way valve 3, the filter 4 and the second electromagnetic directional valve 7, so that the first hydraulic directional valve 8 is controlled to be switched to the right position, and at the moment, the hydraulic oil flows into a rod cavity of the mechanical arm telescopic hydraulic cylinder 9 through the first hydraulic directional valve 8, and the mechanical arm retracts.
S5, when the rapid lifting operation is carried out, the third electromagnetic directional valve 10 is powered on, the left position of the third electromagnetic directional valve 10 is communicated, the adjustable variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil passes through the first one-way valve 3, the filter 4 and the third electromagnetic directional valve 10, so that the second hydraulic directional valve 12 is controlled to be switched to the left position, the hydraulic oil flows into the first oil port of the first lifting motor through the second hydraulic directional valve 12 at the moment, the first lifting motor rotates positively, and the rapid lifting operation is realized.
S6, when the rapid hoisting and descending operation is carried out, the third electromagnetic directional valve 10 is powered off, the fourth electromagnetic directional valve 11 is powered on, the left position of the fourth electromagnetic directional valve 11 is communicated, the adjustable variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil passes through the first one-way valve 3, the filter 4 and the fourth electromagnetic directional valve 11, so that the second hydraulic directional valve 12 is controlled to be switched to the right position, at the moment, the hydraulic oil flows into the second oil port of the first hoisting motor through the second hydraulic directional valve 12, the first hoisting motor rotates reversely, and the rapid hoisting and descending operation is realized.
And S7, when the second hoisting device ascends, the eighth electromagnetic directional valve 26 is powered on, the eighth electromagnetic directional valve 26 is communicated in the left position, the variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil flows into a left oil way of the second hydraulic lock valve group 32 through the first check valve 3, the filter 4 and the eighth electromagnetic directional valve 26, and then the first oil port of the second hoisting motor 33 is supplied with the hydraulic oil, the second hoisting motor 33 rotates forwards, and the speed of the second hoisting device is adjusted by adjusting the fourth check throttle valve 28, so that the precise ascending operation of the hoisting device is realized.
And S8, when the second hoisting descending operation is performed, the eighth electromagnetic directional valve 26 is powered off, the ninth electromagnetic directional valve 27 is powered on, the ninth electromagnetic directional valve 27 is communicated with the left position, the adjustable variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, the hydraulic oil flows into the right oil way of the second hydraulic lock valve group 32 through the first check valve 3, the filter 4 and the ninth electromagnetic directional valve 27, the oil is further supplied to the second oil port of the second hoisting motor 33, the second hoisting motor 33 is reversed, and the speed of the second hoisting device is adjusted by adjusting the fifth one-way throttle valve 29, so that the accurate descending operation of the hoisting device is realized.
And S9, when the mechanical arm performs deceleration braking operation in the hoisting process, the tenth electromagnetic directional valve 34 is powered on, the left position of the tenth electromagnetic directional valve 34 is communicated, the variable hydraulic pump 2 pumps hydraulic oil from the oil tank 1, and the hydraulic oil supplies oil to the deceleration braking hydraulic cylinder 36 through the first one-way valve 3, the filter 4, the tenth electromagnetic directional valve 34 and the sixth one-way throttle valve 35, so that deceleration braking operation is realized.
S10, when the mechanical arm carries out emergency braking operation in the hoisting process, the fifth electromagnetic directional valve 15 is powered on, the left position of the fifth electromagnetic directional valve 15 is communicated, the variable hydraulic pump 2 extracts hydraulic oil from the oil tank 1, and the hydraulic oil supplies oil to the emergency braking hydraulic cylinder 17 through the first one-way valve 3, the filter 4, the fifth electromagnetic directional valve 15 and the first one-way throttle valve 16, so that emergency braking operation is realized.
S11, when the adjustable variable hydraulic pump is damaged, the accumulator 14 can store hydraulic energy while absorbing pressure fluctuation of the emergency driving hydraulic system, and the starting and stopping of the emergency braking hydraulic cylinder 17 can be met. And the hydraulic oil stored in the energy accumulator 14 supplies oil to the emergency brake hydraulic cylinder 17 through the fifth electromagnetic directional valve 15 and the first one-way throttle valve 16, so that the emergency brake operation is realized.
According to the invention, the upper throttling bidirectional locking loop is designed and added in both the mechanical arm lifting loop and the second hoisting motor loop, so that the mechanical arm or the motor is stopped at a required position, and simultaneously, the hydraulic cylinder or the motor can be prevented from moving after stopping, the real-time sensitive regulation of the mechanical arm lifting speed or the motor hoisting speed is realized, and the availability and the efficiency of the system are improved. Meanwhile, energy accumulators are connected in the mechanical arm telescopic loop, the first hoisting loop, namely the quick hoisting loop, the mechanical arm lifting loop, the second hoisting loop and the second hoisting loop, so that the energy is fully recycled, and the impact generated by the system is absorbed, thereby playing a role in protecting the system. Meanwhile, one-way throttle valves are added in all brake circuits to control the brake speed and the generated impact. Thereby further improving the reliability and the safety of the rescue vehicle.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (8)
1. An emergency driving hydraulic system of a rescue vehicle hoisting mechanical arm is characterized by comprising a main hydraulic oil way, a mechanical arm telescopic loop, a first hoisting loop, a mechanical arm lifting loop, a second hoisting loop, a deceleration braking oil way and an emergency braking oil way,
the mechanical arm telescopic loop, the first hoisting loop, the mechanical arm lifting loop, the second hoisting loop, the deceleration braking oil circuit and the emergency braking oil circuit are all communicated with the main hydraulic oil circuit;
the mechanical arm telescopic loop comprises a first electromagnetic directional valve, a second electromagnetic directional valve, a first hydraulic directional valve and a mechanical arm telescopic hydraulic cylinder, the first oil port of the first electromagnetic directional valve, the first oil port of the second electromagnetic directional valve and the first oil port of the first hydraulic directional valve are communicated with the main oil outlet of the main hydraulic oil path, and the second oil port of the first electromagnetic directional valve is communicated with the left control oil port of the first hydraulic directional valve, a second oil port of the second electromagnetic directional valve is communicated with a right control oil port of the first hydraulic directional valve, and the second oil port and the third oil port of the first hydraulic reversing valve are respectively communicated with the rodless cavity and the rod cavity of the mechanical arm telescopic hydraulic cylinder, oil outlets of the first electromagnetic reversing valve, the second electromagnetic reversing valve and the first hydraulic reversing valve are communicated with an oil tank;
the first lifting loop comprises a third electromagnetic directional valve, a fourth electromagnetic directional valve, a second hydraulic directional valve and a first lifting hydraulic motor, the first oil port of the third electromagnetic directional valve, the first oil port of the fourth electromagnetic directional valve and the first oil port of the second hydraulic directional valve are communicated with the main oil outlet of the main hydraulic oil way, and the second oil port of the third electromagnetic directional valve is communicated with the left control oil port of the second hydraulic directional valve, a second oil port of the fourth electromagnetic directional valve is communicated with a right control oil port of the second hydraulic directional valve, and the second oil port and the third oil port of the second hydraulic directional control valve are respectively communicated with the first oil port and the second oil port of the first lifting hydraulic motor, oil outlets of the third electromagnetic directional valve, the fourth electromagnetic directional valve and the second hydraulic directional valve are communicated with an oil tank;
the mechanical arm lifting loop comprises a sixth electromagnetic directional valve, a seventh electromagnetic directional valve, a second one-way throttle valve, a third one-way throttle valve, a first hydraulic control one-way valve, a second hydraulic control one-way valve and a mechanical arm lifting hydraulic cylinder, a first oil port of the sixth electromagnetic directional valve and a first oil port of the seventh electromagnetic directional valve are both communicated with a main oil outlet of the main hydraulic oil circuit, a second oil port of the sixth electromagnetic directional valve and a second oil port of the seventh electromagnetic directional valve are both communicated with an oil tank, a third oil port of the sixth electromagnetic directional valve is communicated with a rodless cavity of the mechanical arm lifting hydraulic cylinder through the second one-way throttle valve and the first hydraulic control one-way valve, a third oil port of the seventh electromagnetic directional valve is communicated with a rod cavity of the mechanical arm lifting hydraulic cylinder through the third one-way throttle valve and the second hydraulic control one-way valve, the first hydraulic control one-way valve, the second one-way throttle valve and the third one-way throttle valve jointly form a first hydraulic lock valve group, a hydraulic control oil port of the first hydraulic control one-way valve is communicated with an oil outlet of the third one-way throttle valve, and a hydraulic control oil port of the second hydraulic control one-way valve is communicated with an oil outlet of the second one-way throttle valve;
the second hoisting loop comprises an eighth electromagnetic directional valve, a ninth electromagnetic directional valve, a fourth one-way throttle valve, a fifth one-way throttle valve, a third hydraulic control one-way valve, a fourth hydraulic control one-way valve and a second hoisting motor, a first oil port of the eighth electromagnetic directional valve and a first oil port of the ninth electromagnetic directional valve are both communicated with the main oil outlet of the main hydraulic oil circuit, a second oil port of the eighth electromagnetic directional valve and a second oil port of the ninth electromagnetic directional valve are both communicated with an oil tank, a third oil port of the eighth electromagnetic directional valve is communicated with the first oil port of the second hoisting motor through the fourth one-way throttle valve and the third hydraulic control one-way valve, a third oil port of the ninth electromagnetic directional valve is communicated with the second oil port of the second hoisting motor through the fifth one-way throttle valve and the fourth hydraulic control one-way valve, and the fourth one-way throttle valve is communicated with the second oil port of the second hoisting motor, The fifth one-way throttle valve, the third hydraulic control one-way valve and the fourth hydraulic control one-way valve form a second hydraulic lock valve group together, a hydraulic control oil port of the third hydraulic control one-way valve is communicated with an oil outlet of the fifth one-way throttle valve, and a hydraulic control oil port of the fourth hydraulic control one-way valve is communicated with an oil outlet of the fourth one-way throttle valve.
2. The emergency driving hydraulic system for the lifting mechanical arm of the rescue vehicle as claimed in claim 1, wherein the main hydraulic oil path comprises an oil tank, an adjustable variable hydraulic pump, a first check valve and a filter, an oil inlet of the adjustable variable hydraulic pump is connected with the oil tank, and an oil outlet of the adjustable variable hydraulic pump is communicated with the mechanical arm telescopic loop, the first lifting loop, the mechanical arm lifting loop, the second lifting loop, the deceleration braking oil path and the emergency braking oil path through the first check valve and the filter.
3. The emergency driving hydraulic system of the rescue vehicle lifting mechanical arm according to claim 1, further comprising an emergency braking oil path, wherein the emergency braking oil path comprises a fifth electromagnetic directional valve, a first one-way throttle valve and an emergency braking hydraulic cylinder, a first oil port of the fifth electromagnetic directional valve is communicated with a main oil outlet of the main hydraulic oil path, a second oil port of the fifth electromagnetic directional valve is communicated with an oil tank, and a third oil port of the fifth electromagnetic directional valve is communicated with a rod cavity of the emergency braking hydraulic cylinder through the first one-way throttle valve.
4. The emergency driving hydraulic system for the rescue vehicle hoisting mechanical arm according to claim 1, further comprising a deceleration braking oil path, wherein the deceleration braking oil path comprises a tenth electromagnetic directional valve, a sixth one-way throttle valve and a deceleration braking hydraulic cylinder, a first oil port of the tenth electromagnetic directional valve is communicated with a main oil outlet of the main hydraulic oil path, a second oil port of the tenth electromagnetic directional valve is communicated with an oil tank, and a third oil port of the tenth electromagnetic directional valve is communicated with a rod cavity of the deceleration braking hydraulic cylinder through the sixth one-way throttle valve.
5. The emergency driving hydraulic system for the mechanical arm of the rescue vehicle crane as claimed in claim 2, wherein an accumulator is further arranged at the outlet of the filter, and the accumulator can reduce the influence of oil pressure fluctuation on the emergency driving hydraulic system during the operation of the emergency driving hydraulic system.
6. The emergency driving hydraulic system for the rescue vehicle lifting mechanical arm according to claim 1, wherein the first electromagnetic directional valve, the second electromagnetic directional valve, the third electromagnetic directional valve, the fourth electromagnetic directional valve, the sixth electromagnetic directional valve, the seventh electromagnetic directional valve, the eighth electromagnetic directional valve and the ninth electromagnetic directional valve are all two-position four-way electromagnetic valves.
7. The emergency drive hydraulic system of a rescue vehicle lifting arm of claim 1, wherein the first and second hydraulic directional control valves are three-position, four-way directional control valves.
8. A driving method of an emergency driving hydraulic system for realizing the lifting arm of the rescue vehicle as claimed in one of claims 1 to 7, characterized in that it comprises the following steps:
s1, when the mechanical arm lifts, the sixth electromagnetic directional valve is powered on, the sixth electromagnetic directional valve is communicated with the left position, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil flows into a left oil way of the first hydraulic lock valve group through the first one-way valve, the filter and the sixth electromagnetic directional valve, and then the rodless cavity of the mechanical arm lifting hydraulic cylinder is supplied with oil, so that the mechanical arm lifting operation is realized;
s2, when the mechanical arm descends, the seventh electromagnetic directional valve is powered on, the left position of the seventh electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil flows into a right oil way of the first hydraulic lock valve group through the first one-way valve, the filter and the seventh electromagnetic directional valve, and then the oil is supplied to a rod cavity of the mechanical arm lifting hydraulic cylinder, so that the mechanical arm descends;
s3, when the mechanical arm stretches out, the first electromagnetic directional valve is powered on, the left position of the first electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil passes through the first one-way valve, the filter and the first electromagnetic directional valve, so that the first hydraulic directional valve is controlled to be switched to the left position, and at the moment, the hydraulic oil flows into a rodless cavity of the mechanical arm telescopic hydraulic cylinder through the first hydraulic directional valve, so that the mechanical arm stretches out;
s4, when the mechanical arm retracts, the first electromagnetic directional valve is powered off, the second electromagnetic directional valve is powered on, the left position of the second electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil passes through the first one-way valve, the filter and the second electromagnetic directional valve, so that the first hydraulic directional valve is controlled to be switched to the right position, and at the moment, the hydraulic oil flows into a rod cavity of the mechanical arm telescopic hydraulic cylinder through the first hydraulic directional valve, so that the mechanical arm retracts;
s5, when the rapid lifting operation is carried out, the third electromagnetic directional valve is electrified, the left position of the third electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil passes through the first one-way valve, the filter and the third electromagnetic directional valve, so that the second hydraulic directional valve is controlled to be switched to the left position, the hydraulic oil flows into the first oil port of the first lifting motor through the second hydraulic directional valve, the first lifting motor rotates positively, and the rapid lifting operation is realized;
s6, when the rapid hoisting and descending operation is carried out, the third electromagnetic directional valve is powered off, the fourth electromagnetic directional valve is powered on, the left position of the fourth electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil passes through the first one-way valve, the filter and the fourth electromagnetic directional valve, so that the second hydraulic directional valve is controlled to be switched to the right position, the hydraulic oil flows into the second oil port of the first hoisting motor through the second hydraulic directional valve at the moment, the first hoisting motor rotates reversely, and the rapid hoisting and descending operation is realized;
s7, when the second hoisting operation is carried out, the eighth electromagnetic directional valve is electrified, the left position of the eighth electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil flows into a left oil way of the second hydraulic lock valve group through the first check valve, the filter and the eighth electromagnetic directional valve, and then the first oil port of the second hoisting motor is supplied with oil, and the second hoisting motor rotates forwards to realize the second hoisting operation;
s8, when the second hoisting and descending operation is carried out, the eighth electromagnetic directional valve is powered off, the ninth electromagnetic directional valve is powered on, the left position of the ninth electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, the hydraulic oil flows into a right oil way of the second hydraulic lock valve group through the first one-way valve, the filter and the ninth electromagnetic directional valve, and then oil is supplied to a second oil port of the second hoisting motor, and the second hoisting motor rotates reversely to realize the second hoisting and descending operation;
s9, when the mechanical arm performs deceleration braking operation in the hoisting process, the tenth electromagnetic directional valve is powered on, the left position of the tenth electromagnetic directional valve is communicated, the adjustable variable hydraulic pump extracts hydraulic oil from the oil tank, and the hydraulic oil supplies oil to the deceleration braking hydraulic cylinder through the first one-way valve, the filter, the tenth electromagnetic directional valve and the sixth one-way throttle valve to realize deceleration braking operation;
s10, when the mechanical arm carries out emergency braking operation in the hoisting process, the fifth electromagnetic directional valve is electrified, the left position of the fifth electromagnetic directional valve is communicated, the variable hydraulic pump extracts hydraulic oil from the oil tank, and the hydraulic oil passes through the first one-way valve, the filter, the fifth electromagnetic directional valve and the first one-way throttle valve and supplies oil to the emergency braking hydraulic cylinder to realize emergency braking operation;
s11, when the adjustable variable displacement hydraulic pump is damaged, the accumulator can store hydraulic energy while absorbing pressure fluctuation of the emergency driving hydraulic system, the starting and stopping of the emergency braking hydraulic cylinder can be met, and hydraulic oil stored in the accumulator is supplied to the emergency braking hydraulic cylinder through the fifth electromagnetic directional valve and the first one-way throttle valve, so that emergency braking operation is realized.
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