CN109185246B - Hydraulic control system and aerial work platform truck - Google Patents
Hydraulic control system and aerial work platform truck Download PDFInfo
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- CN109185246B CN109185246B CN201811397599.1A CN201811397599A CN109185246B CN 109185246 B CN109185246 B CN 109185246B CN 201811397599 A CN201811397599 A CN 201811397599A CN 109185246 B CN109185246 B CN 109185246B
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- 230000007246 mechanism Effects 0.000 claims abstract description 177
- 230000009471 action Effects 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims description 5
- 239000003921 oil Substances 0.000 description 277
- 239000010720 hydraulic oil Substances 0.000 description 19
- 239000012530 fluid Substances 0.000 description 12
- 238000010276 construction Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/044—Working platforms suspended from booms
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a hydraulic control system and an overhead working platform truck, wherein the hydraulic control system comprises: a first actuator (1); a second actuator (2); the main control valve block (3) is used for controlling the reversing of the oil supply circuit of the first executing mechanism (1) and the reversing of the oil supply circuit of the second executing mechanism (2); the switching mechanism (4) is arranged between the main control valve block (3) and the first executing mechanism (1) and the second executing mechanism (2) and is used for switching between a first working position and a second working position, and when the first working position is used, the first executing mechanism (1) is driven to act under the combined action of the main control valve block (3) and the switching mechanism (4); in the second working position, the second executing mechanism (2) is driven to act under the combined action of the main control valve block (3) and the switching mechanism (4). The invention solves the problem that two main control valve blocks are needed to be equipped simultaneously when a second executing mechanism is added, and effectively saves cost.
Description
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a hydraulic control system and an overhead working platform truck.
Background
Along with the rapid development of the construction of the infrastructure in China, the demand and the holding quantity of engineering machinery are rapidly increased, and meanwhile, the requirements on the engineering machinery are higher and higher due to the fact that the working environment of the engineering machinery is more harsh and the working condition is more complex.
Among many construction machines, the overhead working truck is an important component of the construction machine, and the variety of the overhead working truck is increasing to cope with a complex overhead working environment. The existing arm type overhead working platform truck mainly has two structural modes: one with a crank arm and the other without a crank arm, both of which are widely used. Compared with a vehicle model without a crank arm, the vehicle model with the crank arm has the advantages that a certain operation height is increased, the operation is more flexible, and accurate control is easier to realize. When the operation target is approached, the operation height is achieved by changing the lifting and swinging of the crank arm while the amplitude of the main arm is unchanged, the stability and the flexibility of the overhead operation platform truck are improved, the operation comfort of operators is ensured, and the energy consumption of the overhead operation platform truck is reduced.
For the aerial working platform truck with the crank arm, a control valve for controlling the crank arm amplitude is needed to be added in the main control valve block, and for the aerial working platform truck without the crank arm, a control valve for controlling the crank arm amplitude is not needed to be added in the main control valve block. Since the price of the main control valve block including the crank luffing control valve is relatively high and the price of the main control valve block excluding the crank luffing control valve is relatively low, it is common to arrange the main control valve block including the crank luffing control valve in an overhead working platform truck with a crank and the main control valve block excluding the crank luffing control valve in an overhead working platform truck without a crank in order to save costs.
However, the above method brings the following problems:
1. For a producer, the main control valve block comprising the crank amplitude variation control valve and the main control valve block not comprising the crank amplitude variation control valve are required to be purchased simultaneously so as to meet the production requirements of two vehicle types with and without the crank, and the purchase cost and the production maintenance cost of the main control valve blocks in two forms are improved simultaneously, so that the fund turnover and the cost control of a production company are not facilitated, and the development of the company is restrained;
2. For a user, the main control valve block comprising the crank amplitude control valve is arranged in the overhead working platform truck with the crank, so that the platform truck has higher price and higher purchase cost, the cost pressure is higher, the elements of the main control valve block are increased, the failure rate of the elements is greatly improved, the failure modes are more changeable, and the maintenance of equipment are not facilitated;
3. for the aerial work platform car industry, the aerial work platform is a safer and more convenient construction means, the cost of the aerial work platform car is improved, and higher economic requirements are provided for producers and users, so that the popularization and the use of the aerial work platform car industry are not facilitated.
It should be noted that the information disclosed in the background section of the present invention is only for increasing the understanding of the general background of the present invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a hydraulic control system and an overhead working platform truck, which solve the problem that in the prior art, two main control valve blocks are required to be simultaneously arranged for the overhead working platform truck with a crank arm and the overhead working platform truck without the crank arm, and save the cost.
To achieve the above object, the present invention provides a hydraulic control system including:
A first actuator;
a second actuator;
the main control valve block is used for controlling the reversing of the oil supply circuit of the first executing mechanism and the reversing of the oil supply circuit of the second executing mechanism; and
The switching mechanism is arranged between the main control valve block and the first executing mechanism and the second executing mechanism and is used for switching between a first working position and a second working position, and the first executing mechanism is driven to act under the combined action of the main control valve block and the switching mechanism when the first working position is reached; and in the second working position, the second executing mechanism is driven to act under the combined action of the main control valve block and the switching mechanism.
Optionally, when the switching mechanism is in the first working position, the first working oil port of the main control valve block is communicated with the first working oil port of the first executing mechanism, the second working oil port of the main control valve block is communicated with the second working oil port of the first executing mechanism, and the first working oil port and the second working oil port of the second executing mechanism are simultaneously communicated with or disconnected from the first working oil port of the main control valve block, so that the second executing mechanism does not act.
Optionally, when the switching mechanism is in the first working position, the first working oil port of the main control valve block is communicated with the first working oil port of the first executing mechanism, the second working oil port of the main control valve block is communicated with the second working oil port of the first executing mechanism, and the hydraulic control system further comprises a first control valve group arranged between the switching mechanism and the second executing mechanism, and the first control valve group is used for enabling the first working oil port and the second working oil port of the second executing mechanism to be simultaneously in unidirectional conduction with the first working oil port of the main control valve block when the switching mechanism is in the first working position so as to enable the second executing mechanism to be inactive.
Optionally, the first control valve group includes:
the first balance valve comprises a first overflow valve and a first one-way valve which are connected in parallel and is arranged between the switching mechanism and a first working oil port of the second actuating mechanism; and
The second balance valve comprises a second overflow valve and a second one-way valve which are connected in parallel and is arranged between the switching mechanism and a second working oil port of the second executing mechanism;
the oil outlet of the first overflow valve is communicated with the control end of the second overflow valve, and the oil outlet of the second overflow valve is communicated with the control end of the first overflow valve.
Optionally, when the switching mechanism is in the second working position, the first working oil port of the main control valve block is communicated with the first working oil port of the second executing mechanism, the second working oil port of the main control valve block is communicated with the second working oil port of the second executing mechanism, and the first working oil port and the second working oil port of the first executing mechanism are simultaneously communicated with or disconnected from the second working oil port of the main control valve block, so that the first executing mechanism does not act.
Optionally, when the switching mechanism is in the second working position, the first working oil port of the main control valve block is communicated with the first working oil port of the second executing mechanism, the second working oil port of the main control valve block is communicated with the second working oil port of the second executing mechanism, and the hydraulic control system further comprises a second control valve group arranged between the switching mechanism and the first executing mechanism, and the second control valve group is used for enabling the first working oil port and the second working oil port of the first executing mechanism to be simultaneously in unidirectional conduction with the second working oil port of the main control valve block when the switching mechanism is in the second working position so as to enable the first executing mechanism to be inactive.
Optionally, the second control valve group includes:
The third balance valve comprises a third overflow valve and a third one-way valve which are connected in parallel and is arranged between the switching mechanism and the first working oil port of the first executing mechanism; and
The fourth balance valve comprises a fourth overflow valve and a fourth one-way valve which are connected in parallel and is arranged between the switching mechanism and the second working oil port of the first actuating mechanism;
the oil outlet of the third overflow valve is communicated with the control end of the fourth overflow valve, and the oil outlet of the fourth overflow valve is communicated with the control end of the third overflow valve.
Optionally, the switching mechanism comprises a switching valve, the switching valve comprises a first oil port, a second oil port and a third oil port, the first oil port is connected with a first working oil port of the main control valve block and is connected with a first working oil port of the second actuating mechanism, the second oil port is connected with the first working oil port of the first actuating mechanism and the second working oil port, the third oil port is connected with a second working oil port of the main control valve block and is connected with a second working oil port of the first actuating mechanism, and when in a first working position, the first oil port is communicated with the second oil port, and the third oil port is cut off; and when the second working position is adopted, the first oil port is cut off, and the second oil port is communicated with the third oil port.
In order to achieve the above purpose, the invention also provides an aerial working platform vehicle, which comprises the hydraulic control system.
Optionally, the aerial working platform truck further comprises a working platform, a crank arm connected with the working platform and a big arm connected with the crank arm, wherein the first actuating mechanism is a crank arm luffing cylinder for driving the crank arm to luffing, and the second actuating mechanism is a platform swing cylinder for driving the working platform to swing.
Based on the technical scheme, the switching mechanism is arranged, so that the first executing mechanism and the second executing mechanism can be driven to act together with the main control valve block or driven to act, the control of the first executing mechanism and the second executing mechanism is realized on the premise of not changing the structure of the main control valve block, the problem that two main control valve blocks are required to be simultaneously arranged when the second executing mechanism is added in the prior art is solved, and the cost can be greatly saved for both a producer and a user.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a hydraulic schematic diagram of an embodiment of a hydraulic control system of the present invention.
In the figure:
1. A first actuator; 2. a second actuator; 3. a main control valve block; 31. a reversing valve; 32. a first control valve; 33. a second control valve; 34. an overflow valve; 35. an unloading valve; 4. a switching mechanism; 41. a switching valve; 5. a first control valve group; 51. a first overflow valve; 52. a first one-way valve; 53. a second overflow valve; 54. a second one-way valve; 6. the second control valve group; 61. a third overflow valve; 62. a third one-way valve; 63. a fourth overflow valve; 64. a fourth one-way valve; 7. a third actuator; 8. a fourth actuator; 9. a one-way valve; 10. a hydraulic pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
As shown in fig. 1, in one embodiment of the hydraulic control system provided by the invention, the hydraulic control system comprises a first executing mechanism 1, a second executing mechanism 2, a main control valve block 3 and a switching mechanism 4, wherein the main control valve block 3 is used for controlling the reversing of an oil supply circuit of the first executing mechanism 1 and the reversing of an oil supply circuit of the second executing mechanism 2, the switching mechanism 4 is arranged between the main control valve block 3 and the first executing mechanism 1 and between the second executing mechanism 2, and the switching mechanism 4 is used for switching between a first working position and a second working position, and in the first working position, the first executing mechanism 1 is driven to act under the combined action of the main control valve block 3 and the switching mechanism 4; in the second operating position, the second actuator 2 is driven to operate by the combined action of the main control valve block 3 and the switching mechanism 4.
By arranging the switching mechanism 4, the first executing mechanism 1 can be driven to act together with the main control valve block 3 or the second executing mechanism 2 can be driven to act, the control of the first executing mechanism 1 and the second executing mechanism 2 is realized on the premise of not changing the structure of the main control valve block 3, the problem that two main control valve blocks are required to be simultaneously arranged when the second executing mechanism is added in the prior art is solved, and the cost can be greatly saved for a producer or a user. In addition, in the embodiment, when the second executing mechanism 2 is added, the switching between the first executing mechanism 1 and the second executing mechanism 2 is realized through the switching mechanism by utilizing the original main control valve block adopted in the system only with the first executing mechanism 1, so that the main control valve block with more complex configuration structure is avoided, the failure rate of elements is reduced, and the maintenance is convenient.
Optionally, the main control valve block 3 includes a reversing valve 31, where the reversing valve 31 includes an oil inlet, an oil return port, a first working oil port and a second working oil port, the oil inlet is communicated with the oil inlet P on the main control valve block 3, the oil return port is communicated with the oil return port T on the main control valve block 3, the first working oil port is communicated with the first oil port PRL on the main control valve block 3, and the second working oil port is communicated with the second oil port PRR on the main control valve block 3.
The reversing valve 31 includes a neutral position, a first operating position Y1a, and a second operating position Y1b. When the oil inlet is in the middle position, the oil inlet is cut off, and the first working oil port and the second working oil port are communicated with the oil return port; when the first working position Y1a is, an oil inlet of the first working position Y1a is communicated with a first working oil port of the first working position Y1a, and an oil return port of the first working position Y1a is communicated with a second working oil port of the first working position Y1 a; and in the second working position Y1b, the oil inlet is communicated with the second working oil port, and the oil return port is communicated with the first working oil port.
The main control valve block 3 is also provided with a first control valve 32 and a second control valve 33, the first control valve 32 is used for controlling the action of the third actuator 7, and the second control valve 33 is used for controlling the action of the fourth actuator 8.
An overflow valve 34 and an unloading valve 35 are also arranged in the main control valve block 3.
The specific construction of the switching mechanism 4 may be selected in many ways as long as it is capable of achieving its function.
Optionally, the switching mechanism 4 includes a switching valve 41, where the switching valve 41 includes a first oil port, a second oil port, and a third oil port, the first oil port is connected with a first working oil port of the main control valve block 3 and is connected with a first working oil port of the second actuator 2, the second oil port is connected with a first working oil port of the first actuator 1 and a second working oil port of the second actuator 2, the third oil port is connected with a second working oil port of the main control valve block 3 and is connected with a second working oil port of the first actuator 1, and in the first working position, the first oil port is communicated with the second oil port, and the third oil port is cut off; and when the second working position is adopted, the first oil port is cut off, and the second oil port is communicated with the third oil port.
The switching valve 41 can be a two-position three-way electromagnetic valve, and the switching mechanism 4 has simple structure and lower cost.
As shown in fig. 1, the switching mechanism 4 includes an oil port V1, an oil port V2, an oil port J1, an oil port J2, an oil port PR1, and an oil port PR2. Wherein, the hydraulic fluid port V1 communicates with the hydraulic fluid port PRL on the main control valve piece 3, and the hydraulic fluid port V2 communicates with hydraulic fluid port PRR, and hydraulic fluid port PR1 is connected with hydraulic fluid port A of first control valve group 5, and hydraulic fluid port PR2 is connected with hydraulic fluid port B of first control valve group 5, and hydraulic fluid port J1 is connected with hydraulic fluid port A of second control valve group 6, and hydraulic fluid port J2 is connected with hydraulic fluid port B of second control valve group 6. And the oil port V1 is communicated with the first oil port of the switching valve 41 and the oil port a of the first control valve group 5, the oil port V2 is communicated with the oil port B of the second control valve group 6 and the third oil port of the switching valve 41, and the second oil port of the switching valve 41 is communicated with the oil port B of the first control valve group 5 and the oil port a of the second control valve group 6.
In an alternative embodiment, when the switching mechanism 4 is in the first working position, the first working oil port of the main control valve block 3 is communicated with the first working oil port of the first actuator 1, the second working oil port of the main control valve block 3 is communicated with the second working oil port of the first actuator 1, and the first working oil port and the second working oil port of the second actuator 2 are simultaneously communicated with or disconnected from the first working oil port of the main control valve block 3, so that the second actuator 2 does not act.
When the first working oil port and the second working oil port of the second executing mechanism 2 are simultaneously communicated with the first working oil port of the main control valve block 3, the pressures at two ends of the second executing mechanism 2 are the same, so that the second executing mechanism 2 does not act. When the first working oil port and the second working oil port of the second executing mechanism 2 are disconnected with the first working oil port of the main control valve block 3 at the same time, the pressures at two ends of the second executing mechanism 2 are low, so that the second executing mechanism 2 does not act.
The arrangement can make the safety of the hydraulic control system higher, avoid causing the malfunction of the second actuator 2 when the first actuator 1 acts, and realize the independence of the actions of the first actuator 1 and the second actuator 2.
In another alternative embodiment, when the switching mechanism 4 is in the first working position, the first working oil port of the main control valve block 3 is communicated with the first working oil port of the first executing mechanism 1, the second working oil port of the main control valve block 3 is communicated with the second working oil port of the first executing mechanism 1, and the hydraulic control system further comprises a first control valve group 5 arranged between the switching mechanism 4 and the second executing mechanism 2, and the first control valve group 5 is used for enabling the first working oil port and the second working oil port of the second executing mechanism 2 to be simultaneously and unidirectionally communicated with the first working oil port of the main control valve block 3 when the switching mechanism 4 is in the first working position, so that oil return cannot be realized at both ends of the second executing mechanism 2, and therefore, the second executing mechanism 2 can be deactivated.
As shown in fig. 1, the first control valve group 5 includes a first balance valve and a second balance Heng Fa, the first balance valve includes a first relief valve 51 and a first check valve 52 connected in parallel, and is disposed between the switching mechanism 4 and the first working oil port of the second actuator 2; the second balance valve comprises a second overflow valve 53 and a second one-way valve 54 which are connected in parallel and are arranged between the switching mechanism 4 and a second working oil port of the second actuating mechanism 2; wherein the oil outlet of the first relief valve 51 communicates with the control end of the second relief valve 53, and the oil outlet of the second relief valve 53 communicates with the control end of the first relief valve 51.
When the first working oil port and the second working oil port of the second actuator 2 are simultaneously connected with the first working oil port of the main control valve block 3, when the first working oil port of the main control valve block 3 is an oil inlet, the hydraulic oil entering the first control valve group 5 flows to the first working oil port of the second actuator 2 through the first one-way valve 52, although the hydraulic oil entering the right control end of the first overflow valve 51 through the hydraulic oil entering the first control valve group 5 can enter the left control end of the first overflow valve 51 through the oil outlet of the first overflow valve 51, and the left control end of the first overflow valve 51 also has the acting force of a spring, and the sum of the spring force and the pressure of the opening A received by the left control end of the first overflow valve 51 is larger than the sum of the oil return pressure and the pressure of the opening B received by the right control end of the first overflow valve group, so that the first overflow valve 51 cannot be conducted, the hydraulic oil entering the first working oil port of the second actuator 2 can only enter the oil through the first one-way valve 52, and can not continue to enter the oil through the first one-way valve 51 when the left control end of the second actuator 2 reaches the first one-way valve 52. Similarly, the hydraulic oil entering the first control valve group 5 may flow to the second working port of the second actuator 2 through the second check valve 54, while the hydraulic oil entering the first control valve group 5 may enter the left control end of the second relief valve 53 through the port a of the first control valve group 5, the hydraulic oil entering the first control valve group 5 may also enter the right control end of the second relief valve 53 through the oil outlet of the second relief valve 53, and the right control end of the second relief valve 53 has the force of the spring, and the sum of the spring force and the port B pressure received by the right control end of the second relief valve 53 is greater than the sum of the oil return pressure and the port a pressure received by the left control end thereof, so that the second relief valve 53 cannot be conducted, the second working port of the second actuator 2 may only enter oil through the second check valve 54, and cannot return oil through the second check valve 53, and when the oil reaches a certain amount at the right end of the second actuator 2, the hydraulic oil cannot continue to enter through the second check valve 54, so that both ends of the second actuator 2 can be conducted unidirectionally, but the second actuator 2 cannot perform the oil return operation.
When the first working oil port and the second working oil port of the second executing mechanism 2 are simultaneously connected with the first working oil port of the main control valve block 3, the two ends of the second executing mechanism 2 cannot return oil under the retaining action of the first balance valve and the second balance valve when the first working oil port of the main control valve block 3 is an oil return port, so that the second executing mechanism 2 does not act.
In an alternative embodiment, when the switching mechanism 4 is in the second working position, the first working oil port of the main control valve block 3 is communicated with the first working oil port of the second actuator 2, the second working oil port of the main control valve block 3 is communicated with the second working oil port of the second actuator 2, and the first working oil port and the second working oil port of the first actuator 1 are simultaneously communicated with or disconnected from the second working oil port of the main control valve block 3, so that the first actuator 1 does not act.
When the first working oil port and the second working oil port of the first executing mechanism 1 are simultaneously communicated with the second working oil port of the main control valve block 3, the pressures at two ends of the first executing mechanism 1 are the same, so that the first executing mechanism 1 does not act. When the first working oil port and the second working oil port of the first executing mechanism 1 are disconnected with the second working oil port of the main control valve block 3 at the same time, the pressure at two ends of the first executing mechanism 1 is low, so that the first executing mechanism 1 does not act.
The arrangement can make the safety of the hydraulic control system higher, avoid causing the misoperation of the first actuator 1 when the second actuator 2 acts, and realize the independence of the actions of the first actuator 1 and the second actuator 2.
In another alternative embodiment, when the switching mechanism 4 is in the second working position, the first working oil port of the main control valve block 3 is communicated with the first working oil port of the second executing mechanism 2, the second working oil port of the main control valve block 3 is communicated with the second working oil port of the second executing mechanism 2, and the hydraulic control system further comprises a second control valve group 6 arranged between the switching mechanism 4 and the first executing mechanism 1, wherein the second control valve group 6 is used for enabling the first working oil port and the second working oil port of the first executing mechanism 1 to be simultaneously and unidirectionally communicated with the second working oil port of the main control valve block 3 when the switching mechanism 4 is in the second working position, so that oil return cannot be realized at both ends of the first executing mechanism 1, and therefore, the first executing mechanism 1 can be deactivated.
Optionally, the second control valve group 6 includes a third balance valve and a fourth balance Heng Fa, where the third balance valve includes a third overflow valve 61 and a third check valve 62 that are connected in parallel, and are disposed between the switching mechanism 4 and the first working oil port of the first actuator 1; the fourth balance valve comprises a fourth overflow valve 63 and a fourth one-way valve 64 which are connected in parallel and are arranged between the switching mechanism 4 and the second working oil port of the first actuating mechanism 1; wherein the oil outlet of the third overflow valve 61 is in communication with the control end of the fourth overflow valve 63, and the oil outlet of the fourth overflow valve 63 is in communication with the control end of the third overflow valve 61.
When the first working oil port and the second working oil port of the first actuator 1 are simultaneously connected with the second working oil port of the main control valve block 3, when the second working oil port of the main control valve block 3 is an oil inlet, the hydraulic oil entering the second control valve group 6 at port a can flow to the first working oil port of the first actuator 1 through the third one-way valve 62, although the hydraulic oil entering the second control valve group 6 at port B can enter the right control end of the third overflow valve 61, the hydraulic oil entering the second control valve group 6 at port a can also enter the left control end of the third overflow valve 61 through the oil outlet of the third overflow valve 61, and the left control end of the third overflow valve 61 also has the acting force of a spring, and the sum of the spring force and the pressure at the left control end of the third overflow valve 61 is larger than the sum of the oil return pressure and the pressure at the right control end thereof, so that the third overflow valve 61 cannot be conducted, and the hydraulic oil entering the first working oil port of the first actuator 1 can only enter through the third one-way valve 62, and can not continue to enter the oil through the third one-way valve 61 when the left control end of the first actuator 1 reaches the first constant volume valve 62. Similarly, the hydraulic oil entering the second control valve group 6 may flow to the second working port of the first actuator 1 through the fourth check valve 64, while the hydraulic oil entering the first control valve group 6 may enter the left control end of the fourth overflow valve 63 through the port a of the second control valve group 6, the hydraulic oil entering the second control valve group 6 may also enter the right control end of the fourth overflow valve 63 through the oil outlet of the fourth overflow valve 63, and the right control end of the fourth overflow valve 63 has the force of the spring, and the sum of the spring force and the port B pressure received by the right control end of the fourth overflow valve 63 is greater than the sum of the oil return pressure and the port a pressure received by the left control end thereof, so that the fourth overflow valve 63 cannot be conducted, the second working port of the first actuator 1 may only enter oil through the fourth check valve 64, and may not enter oil through the fourth check valve 64 again when the right end of the first actuator 1 reaches a certain amount, and thus both ends of the first actuator 1 may not be conducted unidirectionally, but the first actuator 1 may not be actuated.
When the first working oil port and the second working oil port of the first executing mechanism 1 are simultaneously connected with the second working oil port of the main control valve block 3, and the second working oil port of the main control valve block 3 is an oil return port, oil cannot be returned from both ends of the first executing mechanism 1 under the holding action of the third balance valve and the fourth balance valve, so that the first executing mechanism 1 does not act.
Based on the hydraulic control system, the invention further provides the aerial work platform truck, which comprises the hydraulic control system.
Optionally, the aerial working platform truck further comprises a working platform, a crank arm connected with the working platform and a big arm connected with the crank arm, wherein the first actuating mechanism 1 is a crank arm luffing cylinder for driving the crank arm to luffing, and the second actuating mechanism 2 is a platform swing cylinder for driving the working platform to swing.
Optionally, the third actuating mechanism 7 is a large arm amplitude-variable oil cylinder for driving the large arm amplitude.
Optionally, the fourth actuator 8 is a swing motor, and the swing motor is used for driving the big arm, the crank arm and the working platform to swing.
In a control system of an overhead working truck without a crank arm, a main control valve block 3 includes a reversing valve 31, a first control valve 32, a second control valve 33, an overflow valve 34, and an unloading valve 35; in the overhead working platform truck with the crank arm, the hydraulic control system provided by the embodiment of the invention can still utilize the main control valve block 3 in the original control system of the overhead working platform truck without the crank arm, and the drive of the crank arm luffing cylinder and the swing cylinder is realized by arranging the switching mechanism 4, so that the problem that two main control valve blocks are required to be simultaneously arranged is effectively solved, the cost is greatly saved, and the later maintenance is facilitated.
The hydraulic control system in the above embodiments has positive technical effects that are also applicable to the overhead working platform vehicle, and will not be described here again.
The operation of one embodiment of the hydraulic control system and overhead working truck of the present invention will be described with reference to fig. 1:
as shown in fig. 1, when the aerial platform truck performs crank arm luffing extension, the left end Y1a of the reversing valve 31 is electrified, the left end of the reversing valve 31 is connected with an oil passage, the switching valve 41 is not electrified, and the right end of the switching valve 41 is connected. High-pressure oil fed out by the hydraulic pump 10 enters a large cavity of the crank amplitude cylinder through the one-way valve 9, the oil port P, the reversing valve 31, the oil port PRL, the oil port V1, the switching valve 41, the oil port J1, the oil port A of the second control valve group 6 and the third one-way valve 62, and the cylinder stretches out. The small-cavity hydraulic oil flows back to the oil tank through the fourth overflow valve 63, the oil port B, the oil port J2, the switching valve 41, the oil port V2, the oil port PRR, the reversing valve 31 and the oil port T of the second control valve group 6. Meanwhile, high-pressure oil enters the left end of the platform swing cylinder through the oil port A of the first control valve group 5 and the first one-way valve 52, and enters the right end of the platform swing cylinder through the oil port B of the first control valve group 5 and the second one-way valve 54, but both the first overflow valve 51 and the second overflow valve 53 are in a non-conducting state, and oil return cannot be realized in two cavities of the platform swing cylinder, so that the platform swing cylinder does not act.
When the aerial working platform truck executes crank arm variable amplitude shrinkage, the right end Y1b of the reversing valve 31 is electrified, the right end of the reversing valve 31 is connected with an oil circuit, the switching valve 41 is not electrified, and the right end of the switching valve 41 is connected. High-pressure oil fed out of the hydraulic pump 10 enters a small cavity of the crank amplitude cylinder through the one-way valve 9, the oil port P, the reversing valve 31, the oil port PRR, the oil port V2, the switching valve 41, the oil port J2, the oil port B of the second control valve group 6 and the fourth one-way valve 64, and the cylinder is retracted. The large-cavity hydraulic oil flows back to the oil tank through the third overflow valve 61, the oil port A, the oil port J1, the switching valve 41, the oil port V1, the oil port PRL, the reversing valve 31 and the oil port T of the second control valve group 6. Meanwhile, two ends of the platform swing cylinder are communicated with the oil return port T and kept motionless under the balance keeping effect of the first control valve group 5.
When the platform swing cylinder of the aerial working platform truck swings clockwise, the left end Y1a of the reversing valve 31 is powered on, the left end of the reversing valve 31 is connected with an oil path, the switching valve 41 is powered on, the left end of the switching valve 41 is connected with the hydraulic pump 10, and high-pressure oil supplied by the hydraulic pump 10 enters the left end of the platform swing cylinder through the one-way valve 9, the oil port P, the reversing valve 31, the oil port PRL, the oil port V1, the oil port PR1, the oil port A of the first control valve group 5 and the first one-way valve 52. Hydraulic oil at the right end of the platform swing cylinder flows back to the oil tank through the second overflow valve 53, the oil port B and the oil port PR2 of the first control valve group 5, the switching valve 41, the oil port V2, the oil port PRR, the reversing valve 31 and the oil port T, so that the platform swing cylinder rotates clockwise. Simultaneously, two cavities of the crank arm amplitude-variable oil cylinder are communicated with the oil return port T and kept motionless under the balance keeping effect of the second control valve group 6.
When the platform swing cylinder of the aerial work platform truck swings anticlockwise, the right end Y1b of the reversing valve 31 is electrified, the right end of the reversing valve 31 is communicated with an oil way, the switching valve 41 is electrified, and the left end of the switching valve 41 is communicated. High-pressure oil fed out of the hydraulic pump 10 enters the right end of the platform swing cylinder through the one-way valve 9, the oil port P, the reversing valve 31, the oil port PRR, the oil port V2, the switching valve 41, the oil port PR2, the oil port B of the first control valve group 5 and the second one-way valve 54. Hydraulic oil at the left end of the platform swing cylinder flows back to the oil tank through the first overflow valve 51, the oil port A, the oil port PR1, the oil port V1, the oil port PRL, the reversing valve 31 and the oil port T of the first control valve group 5, so that the swing cylinder rotates anticlockwise. Meanwhile, high-pressure oil enters the left end of the crank amplitude cylinder through the oil port A of the second control valve group 6 and the third one-way valve 62, and enters the right end of the crank amplitude cylinder through the oil port B of the second control valve group 6 and the fourth one-way valve 64, but both the third overflow valve 61 and the fourth overflow valve 63 are in a non-conducting state, and oil return cannot be realized in two cavities of the crank amplitude cylinder, so that the crank amplitude cylinder does not act.
When the crank arm amplitude cylinder and the platform swing cylinder do not work, the left end and the right end of the reversing valve 31 are not electrified, the reversing valve 31 is arranged in a neutral position function under the action of the centering spring, and high-pressure oil flows back to the oil tank through the overflow valve 34 or the unloading valve 35.
By way of illustration of various embodiments of the hydraulic control system and overhead working truck of the present invention, it can be seen that embodiments of the hydraulic control system and overhead working truck of the present invention have at least one or more of the following advantages:
1. By arranging the switching mechanism, the main control valve blocks can be prevented from being replaced, so that the unification of the main control valve blocks is realized by two types of aerial working platform vehicle with and without crank arms, the simultaneous allocation of the two types of main control valve blocks is avoided, the cost is reduced, and the production and the later maintenance are facilitated;
2. The hydraulic system used in the vehicle model without the crank arm is added with the switching mechanism, so that the crank arm amplitude variation oil cylinder and the platform swing oil cylinder can be controlled simultaneously, and the structural variation is small;
3. the balance valve group is arranged between the switching mechanism and the first and second executing mechanisms, so that the independence of respective actions can be realized, and the executing mechanisms which do not act can be locked, so that the safety is ensured.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (8)
1. A hydraulic control system, comprising:
a first actuator (1);
A second actuator (2);
A main control valve block (3) for controlling the reversing of the oil supply path of the first actuator (1) and the reversing of the oil supply path of the second actuator (2); and
The switching mechanism (4) is arranged between the main control valve block (3) and the first executing mechanism (1) and the second executing mechanism (2) and is used for switching between a first working position and a second working position, and the first executing mechanism (1) is driven to act under the combined action of the main control valve block (3) and the switching mechanism (4) when the first working position is used; in the second working position, the second executing mechanism (2) is driven to act under the combined action of the main control valve block (3) and the switching mechanism (4);
When the switching mechanism (4) is in the first working position, a first working oil port of the main control valve block (3) is communicated with a first working oil port of the first executing mechanism (1), a second working oil port of the main control valve block (3) is communicated with a second working oil port of the first executing mechanism (1), the hydraulic control system further comprises a first control valve group (5) arranged between the switching mechanism (4) and the second executing mechanism (2), and the first control valve group (5) is used for enabling the first working oil port and the second working oil port of the second executing mechanism (2) to be simultaneously communicated with the first working oil port of the main control valve block (3) in a one-way mode when the switching mechanism (4) is in the first working position so as to enable the second executing mechanism (2) to be not operated;
The first control valve group (5) comprises:
the first balance valve comprises a first overflow valve (51) and a first one-way valve (52) which are connected in parallel and is arranged between the switching mechanism (4) and a first working oil port of the second actuating mechanism (2); and
The second balance valve comprises a second overflow valve (53) and a second one-way valve (54) which are connected in parallel and is arranged between the switching mechanism (4) and a second working oil port of the second actuating mechanism (2);
the oil outlet of the first overflow valve (51) is communicated with the control end of the second overflow valve (53), and the oil outlet of the second overflow valve (53) is communicated with the control end of the first overflow valve (51).
2. The hydraulic control system according to claim 1, characterized in that the switching mechanism (4) is in the first working position, the first working port of the main control valve block (3) is communicated with the first working port of the first actuator (1), the second working port of the main control valve block (3) is communicated with the second working port of the first actuator (1), and the first working port and the second working port of the second actuator (2) are simultaneously communicated with or disconnected from the first working port of the main control valve block (3) so that the second actuator (2) does not act.
3. The hydraulic control system according to claim 1, characterized in that the switching mechanism (4) is in the second working position, the first working port of the main control valve block (3) is communicated with the first working port of the second actuator (2), the second working port of the main control valve block (3) is communicated with the second working port of the second actuator (2), and the first working port and the second working port of the first actuator (1) are simultaneously communicated with or disconnected from the second working port of the main control valve block (3) so that the first actuator (1) does not act.
4. The hydraulic control system according to claim 1, characterized in that the switching mechanism (4) is in communication with the first working port of the second actuator (2) when in the second working position, the second working port of the main control valve block (3) is in communication with the second working port of the second actuator (2), and the hydraulic control system further comprises a second control valve group (6) arranged between the switching mechanism (4) and the first actuator (1), the second control valve group (6) being configured to simultaneously conduct the first working port and the second working port of the first actuator (1) unidirectionally with the second working port of the main control valve block (3) when the switching mechanism (4) is in the second working position, so that the first actuator (1) is not operated.
5. The hydraulic control system according to claim 4, characterized in that the second control valve group (6) comprises:
The third balance valve comprises a third overflow valve (61) and a third one-way valve (62) which are connected in parallel and is arranged between the switching mechanism (4) and the first working oil port of the first actuating mechanism (1); and
The fourth balance valve comprises a fourth overflow valve (63) and a fourth one-way valve (64) which are connected in parallel and are arranged between the switching mechanism (4) and the second working oil port of the first actuating mechanism (1);
the oil outlet of the third overflow valve (61) is communicated with the control end of the fourth overflow valve (63), and the oil outlet of the fourth overflow valve (63) is communicated with the control end of the third overflow valve (61).
6. The hydraulic control system according to any one of claims 1 to 5, characterized in that the switching mechanism (4) comprises a switching valve (41), the switching valve (41) comprising a first oil port, a second oil port and a third oil port, the first oil port being connected with a first working oil port of the main control valve block (3) and with a first working oil port of the second actuator (2), the second oil port being connected with a first working oil port of the first actuator (1) and with the second actuator (2) and with a second working oil port, the third oil port being connected with a second working oil port of the main control valve block (3) and with a second working oil port of the first actuator (1), the first oil port being in communication with the second oil port and the third oil port being truncated in the first working position; and when the second working position is set, the first oil port is cut off, and the second oil port is communicated with the third oil port.
7. An aerial platform truck comprising a hydraulic control system as claimed in any one of claims 1 to 6.
8. The aerial working platform truck according to claim 7, further comprising a working platform, a crank arm connected with the working platform and a big arm connected with the crank arm, wherein the first actuating mechanism (1) is a crank arm luffing cylinder for driving the crank arm luffing, and the second actuating mechanism (2) is a platform swing cylinder for driving the working platform to swing.
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| CN110594212B (en) * | 2019-09-06 | 2024-06-07 | 浙江鼎力机械股份有限公司 | Control valve, amplitude-variable oil cylinder, working method of amplitude-variable oil cylinder and aerial working platform |
| CN115450970A (en) * | 2022-09-19 | 2022-12-09 | 内蒙古北方重型汽车股份有限公司 | Electric drive mining dump truck folding ladder control device and control method thereof |
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