CN113911928B - Hydraulic system of luffing mechanism of crank arm type overhead working truck - Google Patents
Hydraulic system of luffing mechanism of crank arm type overhead working truck Download PDFInfo
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- CN113911928B CN113911928B CN202111134198.9A CN202111134198A CN113911928B CN 113911928 B CN113911928 B CN 113911928B CN 202111134198 A CN202111134198 A CN 202111134198A CN 113911928 B CN113911928 B CN 113911928B
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- 238000005452 bending Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/06—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
- B66C23/42—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes with jibs of adjustable configuration, e.g. foldable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/68—Jibs foldable or otherwise adjustable in configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/82—Luffing gear
- B66C23/821—Bracing equipment for booms
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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
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- 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
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a hydraulic system of a luffing mechanism of a crank arm type overhead working truck. The upper luffing cylinder comprises an upper luffing non-rod cavity and an upper luffing rod cavity; the lower amplitude variation oil cylinder comprises a lower amplitude variation no-rod cavity and a lower amplitude variation rod cavity; the first reversing valve comprises a first working port and a second working port; the first reversing valve comprises a third working port and a fourth working port; the balance adjusting assembly comprises four balance valves and a shuttle valve. When the upper amplitude-variable oil cylinder drives the telescopic arm to descend, the telescopic arm can continuously press down when contacting with the support on the secondary arm, at the moment, the balance valve with the rod cavity of the lower amplitude-variable oil cylinder is opened, so that the piston rod of the lower amplitude-variable oil cylinder stretches out, the pressure born by the secondary arm is relieved, the secondary arm is prevented from bending deformation and extrusion damage of the contact part of the structural part, fatigue damage of the structural part is reduced, and the service life of the equipment is prolonged.
Description
Technical Field
The invention relates to the technical field of overhead working vehicles, in particular to a crank arm type hydraulic system of an amplitude changing mechanism of an overhead working vehicle.
Background
When the boom is retracted, the lower luffing cylinder drives the main boom and the secondary boom to be lowered, and the upper luffing cylinder is operated to drive the telescopic boom to be lowered after the traditional crank arm type overhead working truck is in place. When the telescopic boom is just lowered in place, the manual operation cannot be stopped in time, and even after the operation button is stopped, the amplitude-variable oil cylinder still has a small displacement due to the inertia of the moving part and the closing slope of the hydraulic valve. Under both factors, the telescoping arm will continue to press downwardly after having contacted the support on the secondary arm. Because the balance valve of the lower luffing cylinder locks oil in the cylinder, the lower luffing cylinder is also equivalent to a rigid member, the secondary arm cannot automatically adjust the posture of the arm support to release pressure through the expansion and contraction of the lower luffing cylinder after being pressed, so that the secondary arm can generate bending deformation, and the contact part of the secondary arm and the connecting hinge is pressed, deformed and even damaged. The service life of the structural members and the equipment is shortened after long-term operation.
Disclosure of Invention
In order to solve the technical problems, the invention provides a hydraulic system of a luffing mechanism of a crank arm type overhead working truck, which comprises: the device comprises an upper amplitude variation oil cylinder, a lower amplitude variation oil cylinder, a first reversing valve, a second reversing valve and a balance adjusting assembly, wherein the upper amplitude variation oil cylinder comprises an upper amplitude variation non-rod cavity and an upper amplitude variation rod cavity; the lower amplitude variation oil cylinder comprises a lower amplitude variation no-rod cavity and a lower amplitude variation rod cavity; the first reversing valve comprises a first working port and a second working port; the first reversing valve comprises a third working port and a fourth working port; the balance adjusting assembly comprises a first balance valve, a second balance valve, a third balance valve, a fourth balance valve and a shuttle valve; the first working port is communicated with the upper amplitude transformer rod-free cavity through a first balance valve, the second working port is communicated with the upper amplitude transformer rod cavity through a second balance valve, the third working port is communicated with the lower amplitude transformer rod-free cavity through a third balance valve, and the fourth working port is communicated with the lower amplitude transformer rod cavity through a fourth balance valve; the shuttle valve comprises a first shuttle valve oil inlet, a second shuttle valve oil inlet and a third shuttle valve oil outlet, wherein the first shuttle valve oil inlet is communicated with a communication oil path between the second working port and the second balance valve, the second shuttle valve oil inlet is communicated with a communication oil path between the third working port and the third balance valve, and the third shuttle valve oil outlet is communicated with the fourth balance valve.
In one embodiment of the invention, the oil tank further comprises an oil inlet pipeline, an oil return pipeline and an oil tank, wherein the first reversing valve comprises a first oil inlet and a first oil return port, the second reversing valve comprises a second oil inlet and a second oil return port, the first oil inlet and the second oil inlet are connected with the oil tank through the oil inlet pipeline, and the first oil return port and the second oil return port are connected with the oil tank through the oil return pipeline.
In one embodiment of the invention, the first balance valve comprises a first oil inlet and an oil outlet, the first oil inlet is communicated with the upper amplitude rodless cavity, and the second oil inlet is communicated with the first working port.
In one embodiment of the invention, the second balancing valve comprises a third oil inlet and outlet, the third oil inlet and outlet is communicated with the upper amplitude rod cavity, and the fourth oil inlet and outlet is communicated with the second working port.
In one embodiment of the present invention, the first balance valve further includes a first pilot control port, and the second balance valve further includes a second pilot control port, the first pilot control port being in communication with the fourth oil inlet and outlet port, and the second pilot control port being in communication with the second oil inlet and outlet port.
In one embodiment of the invention, the third balance valve comprises a fifth oil inlet and an oil outlet, wherein the fifth oil inlet and the oil outlet are communicated with the lower amplitude rodless cavity, and the sixth oil inlet and the oil outlet are communicated with the third working port.
In one embodiment of the invention, the fourth balance valve comprises a seventh oil inlet and outlet and an eighth oil inlet and outlet, the seventh oil inlet and outlet is communicated with the lower amplitude transformer cavity, the eighth oil inlet and outlet is communicated with the fourth working port, and the third balance valve comprises a third pilot control port which is communicated with a communication oil path between the seventh oil inlet and outlet and the lower amplitude transformer cavity.
In one embodiment of the present invention, the first shuttle valve oil inlet is connected to a communication oil path between the fourth oil inlet and outlet and the second working port, the second shuttle valve oil inlet is connected to a communication oil path between the sixth oil inlet and outlet and the third working port, and the fourth balance valve further includes a fourth pilot control port, where the fourth pilot control port is connected to the third shuttle valve oil outlet.
In one embodiment of the present invention, the first reversing valve is a two-position four-way solenoid valve.
In one embodiment of the present invention, the second reversing valve is a two-position four-way solenoid valve.
The beneficial effects are that: according to the crank arm type aerial working vehicle luffing mechanism hydraulic system, when the upper luffing cylinder drives the telescopic arm to be lowered, the telescopic arm is contacted with the support on the secondary arm to be continuously pressed down, at the moment, the balance valve of the rod cavity of the lower luffing cylinder is opened, so that the piston rod of the lower luffing cylinder extends out to drive the secondary arm to automatically adjust the posture of the arm support, the pressure born by the secondary arm is relieved, bending deformation of the secondary arm and extrusion damage of the contact part of a structural member are avoided, fatigue damage of the structural member is reduced, and the service life of equipment is prolonged.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which
Fig. 1 is a schematic view of the overall structure of the hydraulic system of the present invention.
FIG. 2 is a schematic view of a luffing mechanism of a crank arm aerial vehicle.
Description of the specification reference numerals: 1. an upper luffing cylinder; 11. an upper horn-free chamber; 12. the upper amplitude has a rod cavity; 2. a lower luffing cylinder; 21. a lower horn-less chamber; 22. the lower amplitude has a rod cavity; 3. a first reversing valve; 31. a first work port; 32. a second work port; 33. a first oil inlet; 34. a first oil return port; 4. a second reversing valve; 41. a third working port; 42. a fourth work port; 43. a second oil inlet; 44. a second oil return port; 5. a first balancing valve; 51. a first oil inlet and outlet; 52. a second oil inlet and outlet; 53. a first pilot control port; 6. a second balance valve; 61. a third oil inlet and outlet; 62. a fourth oil inlet and outlet; 63. a second pilot control port; 7. a third balancing valve; 71. a fifth oil inlet and outlet port; 72. a sixth oil inlet and outlet; 73. a third pilot control port; 8. a fourth balancing valve; 81. a seventh oil inlet and outlet port; 82. an eighth oil inlet and outlet; 83. a fourth pilot control port; 9. a shuttle valve; 91. the first shuttle valve oil inlet; 92. the second shuttle valve oil inlet; 93. and the third shuttle valve is used for oil outlet.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Referring to fig. 1, a hydraulic system of a luffing mechanism of a crank-type overhead working truck according to the present invention includes:
the upper amplitude variation oil cylinder 1 comprises an upper amplitude variation no-rod cavity 11 and an upper amplitude variation rod cavity 12;
the lower luffing cylinder 2 comprises a lower luffing non-rod cavity 21 and a lower luffing rod cavity 22;
a first reversing valve 3, wherein the first reversing valve 3 comprises a first working port 31 and a second working port 32;
the second reversing valve 4, the first reversing valve 3 comprises a third working port 41 and a fourth working port 42;
the balance adjusting assembly comprises a first balance valve 5, a second balance valve 6, a third balance valve 7, a fourth balance valve 8 and a shuttle valve 9;
the first working port 31 is communicated with the upper amplitude transformer-free rod cavity 11 through the first balance valve 5, the second working port 32 is communicated with the upper amplitude transformer-free rod cavity 12 through the second balance valve 6, the third working port 41 is communicated with the lower amplitude transformer-free rod cavity 21 through the third balance valve 7, and the fourth working port 42 is communicated with the lower amplitude transformer-free rod cavity 22 through the fourth balance valve 8;
the shuttle valve 9 includes a first shuttle valve oil inlet 91, a second shuttle valve oil inlet 92, and a third shuttle valve oil outlet 93, where the first shuttle valve oil inlet 91 is connected to a communication oil path between the second working port 32 and the second balance valve 6, the second shuttle valve oil inlet 92 is connected to a communication oil path between the third working port 41 and the third balance valve 7, and the third shuttle valve oil outlet 93 is connected to the fourth balance valve 8.
Specifically, the first reversing valve 3 and the second reversing valve 4 are two-position four-way electromagnetic valves, the flow entering the upper luffing cylinder 1 and the lower luffing cylinder 2 can be regulated by regulating the current of the electromagnetic valves, the regulation of the action speed of the cylinders is realized, the hydraulic control system further comprises an oil inlet pipeline, an oil return pipeline and an oil tank, the first reversing valve 3 comprises a first oil inlet 33 and a first oil return port 34, the second reversing valve 4 comprises a second oil inlet 43 and a second oil return port 44, the first oil inlet 33 and the second oil inlet 43 are connected to the oil tank through the oil inlet pipeline, and the first oil return port 34 and the second oil return port 44 are connected to the oil tank through the oil return pipeline. The pressure oil respectively enters the first oil inlet 33 and the second oil inlet 43 through the oil inlet pipeline, and the return oil in the two solenoid valves is converged to the return oil pipeline through the first oil return port 34 and the second oil return port 44 and returns to the oil tank.
Specifically, the first balance valve 5 comprises a first oil inlet and outlet port 51, a second oil inlet and outlet port 52 and a first pilot control port 53, wherein the first oil inlet and outlet port 51 is communicated with the upper amplitude no-rod cavity 11, and the second oil inlet and outlet port 52 is communicated with the first working port 31; the second balance valve 6 comprises a third oil inlet and outlet port 61, a fourth oil inlet and outlet port 62 and a second pilot control port 63, the third oil inlet and outlet port 61 is communicated with the upper amplitude transformer cavity 12, and the fourth oil inlet and outlet port 62 is communicated with the second working port 32; the first pilot control port 53 communicates with the fourth oil inlet/outlet port 62, and the second pilot control port 63 communicates with the second oil inlet/outlet port 52.
Specifically, the third balance valve 7 includes a fifth oil inlet and outlet 71, a sixth oil inlet and outlet 72, and a third pilot control port 73, where the fifth oil inlet and outlet 71 communicates with the lower luffing rodless chamber 21, and the sixth oil inlet and outlet 72 communicates with the third working port 41; the fourth balance valve 8 comprises a seventh oil inlet and outlet port 81, an eighth oil inlet and outlet port 82 and a fourth pilot control port 83, wherein the seventh oil inlet and outlet port 81 is communicated with the lower amplitude transformer cavity 22, the eighth oil inlet and outlet port 82 is communicated with the fourth working port 42, and the third pilot control port 73 is communicated with a communication oil path between the seventh oil inlet and outlet port 81 and the lower amplitude transformer cavity 22.
Specifically, the first shuttle valve oil inlet 91 is connected to the oil path between the fourth oil inlet and outlet port 62 and the second working port 32, the second shuttle valve oil inlet 92 is connected to the oil path between the sixth oil inlet and outlet port 72 and the third working port 41, and the fourth pilot control port 83 is connected to the third shuttle valve oil outlet port 93.
An oil way which enters the upper amplitude-variable oil cylinder 1 through the first reversing valve 3 and is provided with a rod cavity balance valve is branched into a branch and enters the shuttle valve 9; the oil path which enters the rodless cavity balance valve of the lower luffing cylinder 2 through the second reversing valve 4 is also divided into a branch path and enters the shuttle valve 9, and after the shuttle valve 9 compares the pressures of the oil from the two branch paths, the oil with higher pressure enters the fourth pilot oil port of the fourth balance valve 8 of the lower luffing rod cavity 22 and is used for opening the fourth balance valve 8 of the lower luffing rod cavity 22.
Referring to fig. 2, a schematic diagram of an existing luffing mechanism of a crank arm type aerial working vehicle is shown, by means of the arrangement of the hydraulic system of the embodiment, when the lower luffing cylinder 2 is retracted, the main arm and the secondary arm are driven to fall in place, then the upper luffing cylinder 1 is operated to retract, the telescopic arm is driven to fall, and when the telescopic arm is contacted with the support on the secondary arm, the telescopic arm still continues to press downwards, at this time, the pressure oil from the oil inlet of the upper luffing cavity 12 opens the shuttle valve 9 to enter the fourth pilot control port 83 of the fourth balance valve 8 of the lower luffing cavity 22, and the oil back pressure of the lower luffing cavity 21 jointly acts to open the fourth balance valve 8 of the lower luffing cavity 22, so that the piston rod of the lower luffing cylinder 2 freely stretches out, the secondary arm is driven to adjust the arm support posture by itself, the pressure born by the secondary arm is relieved, and thus the bending deformation of the equipment can be reduced, and the service life of the equipment is prolonged.
The working principle of the invention is as follows:
when the first reversing valve 3 is electrified and the first working port 31 works, one path of pressure oil at the outlet of the pressure oil enters the upper amplitude-variable rodless cavity 11 through the first balance valve 5, and the other path of pressure oil enters the second pilot control port 63 of the second balance valve 6 and acts together with the oil back pressure of the upper amplitude-variable rod cavity 12 to open the first balance valve 5, so that the extension action of the upper amplitude-variable oil cylinder 1 is realized, and the telescopic arm is driven to be lifted upwards;
when the first reversing valve 3 is electrified and the second working port 32 works, the pressure oil at the outlet of the first reversing valve is three-way, one path enters the upper amplitude-variable rod cavity 12 through the second balance valve 6, and the other path and the oil back pressure of the no-rod cavity of the upper amplitude-variable oil cylinder 1 jointly act to open the first balance valve 5 of the upper amplitude-variable rod cavity 11, so that the retraction action of the upper amplitude-variable oil cylinder 1 is realized, and the telescopic arm is driven to be released; the third path enters a third pilot control port 73 of a third balance valve 7 of the lower luffing with rod cavity 22 through the shuttle valve 9, and opens a fourth balance valve 8 of the lower luffing with rod cavity 22 under the combined action of the oil back pressure of the lower luffing with rod cavity 22, so that the piston rod of the lower luffing cylinder 2 stretches out, when the telescopic boom is lowered and pressed on the support of the secondary arm, the fourth balance valve 8 of the lower luffing with rod cavity 22 is opened, the piston rod of the lower luffing cylinder 2 stretches out, the tail end of the secondary arm is driven to lift, the posture of the secondary arm is regulated, and the pressure born by the secondary arm is relieved;
when the second reversing valve 4 is electrified and the third working port 41 works, one path of pressure oil at the outlet of the second reversing valve enters the lower amplitude transformer cavity 21 through the third balance valve 7 of the lower amplitude transformer cavity 21, the other path of oil enters the fourth pilot control port 83 of the fourth balance valve 8 of the lower amplitude transformer cavity 22 through the shuttle valve 9, and the fourth balance valve 8 is opened under the combined action of the oil back pressure of the lower amplitude transformer cavity 22, so that the lower amplitude transformer cylinder 2 extends to drive the main arm and the secondary arm to lift upwards;
when the second reversing valve 4 is electrified and the fourth working port 42 works, the pressure oil at the outlet of the working port passes through the one-way valve of the fourth balance valve 8 of the lower amplitude transformer cavity 22 and then is divided into two paths, one path enters the lower amplitude transformer cavity 22, and the other path and the oil back pressure of the lower amplitude transformer cavity 21 jointly act to open the third balance valve 7 of the lower amplitude transformer cavity 21, so that the retraction action of the lower amplitude transformer cylinder 2 is realized, and the main arm and the secondary arm are driven to be released.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (4)
1. A hydraulic system for a luffing mechanism of a crank arm type overhead working truck, comprising:
the upper amplitude variation oil cylinder comprises an upper amplitude variation no-rod cavity and an upper amplitude variation rod cavity;
the lower amplitude variation oil cylinder comprises a lower amplitude variation no-rod cavity and a lower amplitude variation rod cavity;
the first reversing valve comprises a first working port and a second working port;
the first reversing valve comprises a third working port and a fourth working port;
the balance adjusting assembly comprises a first balance valve, a second balance valve, a third balance valve, a fourth balance valve and a shuttle valve;
the first working port is communicated with the upper amplitude transformer rod-free cavity through a first balance valve, the second working port is communicated with the upper amplitude transformer rod cavity through a second balance valve, the third working port is communicated with the lower amplitude transformer rod-free cavity through a third balance valve, and the fourth working port is communicated with the lower amplitude transformer rod cavity through a fourth balance valve;
the shuttle valve comprises a first shuttle valve oil inlet, a second shuttle valve oil inlet and a third shuttle valve oil outlet, the first shuttle valve oil inlet is communicated with a communication oil path between the second working port and the second balance valve, the second shuttle valve oil inlet is communicated with a communication oil path between the third working port and the third balance valve, and the third shuttle valve oil outlet is communicated with the fourth balance valve;
the first balance valve comprises a first oil inlet and outlet and a second oil inlet and outlet, the first oil inlet and outlet is communicated with the upper amplitude rodless cavity, the second oil inlet and outlet is communicated with the first working port, the second balance valve comprises a third oil inlet and outlet and a fourth oil inlet and outlet, the third oil inlet and outlet is communicated with the upper amplitude rod cavity, the fourth oil inlet and outlet is communicated with the second working port, the first balance valve further comprises a first pilot control port, the second balance valve further comprises a second pilot control port, the first pilot control port is communicated with the fourth oil inlet and outlet, and the second pilot control port is communicated with the second oil inlet and outlet; the third balance valve comprises a fifth oil inlet and outlet and a sixth oil inlet and outlet, the fifth oil inlet and outlet is communicated with the lower amplitude non-rod cavity, the sixth oil inlet and outlet is communicated with the third working port, the fourth balance valve comprises a seventh oil inlet and outlet and an eighth oil inlet and outlet, the seventh oil inlet and outlet is communicated with the lower amplitude rod cavity, the eighth oil inlet and outlet is communicated with the fourth working port, the third balance valve comprises a third pilot control port, the third pilot control port is communicated with a communication oil path between the seventh oil inlet and outlet and the lower amplitude rod cavity, the first shuttle valve oil inlet is communicated with a communication oil path between the fourth oil inlet and outlet and the second working port, the second shuttle valve oil inlet is communicated with a communication oil path between the sixth oil inlet and outlet and the third working port, and the fourth balance valve further comprises a fourth pilot control port, and the fourth pilot control port is communicated with a third shuttle valve oil outlet.
2. The hydraulic system of a luffing mechanism of a crank arm type overhead working truck according to claim 1, further comprising an oil inlet pipeline, an oil return pipeline and an oil tank, wherein the first reversing valve comprises a first oil inlet and a first oil return port, the second reversing valve comprises a second oil inlet and a second oil return port, the first oil inlet and the second oil inlet are connected with the oil tank through the oil inlet pipeline, and the first oil return port and the second oil return port are connected with the oil tank through the oil return pipeline.
3. The hydraulic system of a luffing mechanism of a crank arm type overhead working truck according to claim 1, wherein the first reversing valve is a two-position four-way solenoid valve.
4. The hydraulic system of a luffing mechanism of a crank arm type overhead working truck according to claim 1, wherein the second reversing valve is a two-position four-way solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111134198.9A CN113911928B (en) | 2021-09-26 | 2021-09-26 | Hydraulic system of luffing mechanism of crank arm type overhead working truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111134198.9A CN113911928B (en) | 2021-09-26 | 2021-09-26 | Hydraulic system of luffing mechanism of crank arm type overhead working truck |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113911928A CN113911928A (en) | 2022-01-11 |
| CN113911928B true CN113911928B (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111134198.9A Active CN113911928B (en) | 2021-09-26 | 2021-09-26 | Hydraulic system of luffing mechanism of crank arm type overhead working truck |
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| CN (1) | CN113911928B (en) |
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| CN204646832U (en) * | 2015-05-29 | 2015-09-16 | 山东琴海船舶设备有限公司 | A kind of flow distributing system for horizontal folding-jib loop wheel machine |
| CN209261941U (en) * | 2018-12-11 | 2019-08-16 | 徐州重型机械有限公司 | The hydraulic control system and crane of crane |
| CN110937556A (en) * | 2019-12-09 | 2020-03-31 | 怀化学院 | Crank arm type hydraulic system of overhead working truck |
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2021
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| KR19980057540A (en) * | 1996-12-30 | 1998-09-25 | 추호석 | Driving device of heavy equipment |
| JP2004301215A (en) * | 2003-03-31 | 2004-10-28 | Hitachi Constr Mach Co Ltd | Hydraulic driving device for work vehicle |
| CN202322251U (en) * | 2011-11-12 | 2012-07-11 | 徐州海伦哲专用车辆股份有限公司 | Work arm buffering control system of aerial work platform trucks |
| CN204646832U (en) * | 2015-05-29 | 2015-09-16 | 山东琴海船舶设备有限公司 | A kind of flow distributing system for horizontal folding-jib loop wheel machine |
| CN209261941U (en) * | 2018-12-11 | 2019-08-16 | 徐州重型机械有限公司 | The hydraulic control system and crane of crane |
| CN110937556A (en) * | 2019-12-09 | 2020-03-31 | 怀化学院 | Crank arm type hydraulic system of overhead working truck |
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| CN113911928A (en) | 2022-01-11 |
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