CN117329180A - Arm support hydraulic control system and hydraulic engineering machinery - Google Patents
Arm support hydraulic control system and hydraulic engineering machinery Download PDFInfo
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- CN117329180A CN117329180A CN202311125792.0A CN202311125792A CN117329180A CN 117329180 A CN117329180 A CN 117329180A CN 202311125792 A CN202311125792 A CN 202311125792A CN 117329180 A CN117329180 A CN 117329180A
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 70
- 230000009471 action Effects 0.000 claims description 11
- 239000003921 oil Substances 0.000 description 188
- 230000001276 controlling effect Effects 0.000 description 14
- 239000010720 hydraulic oil Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036544 posture Effects 0.000 description 1
- 230000009467 reduction 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
- F15B11/22—Synchronisation of the movement of 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
-
- 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
- F15B2211/20576—Systems with pumps with multiple pumps
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
- F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention belongs to the technical field of engineering machinery and provides a boom hydraulic control system and hydraulic engineering machinery, wherein the boom hydraulic control system comprises an oil cylinder body, a first oil way, a second oil way and a control unit, the oil cylinder body comprises a rod cavity and a rodless cavity, the first oil way is connected between an oil tank and the rodless cavity, a first bidirectional pump and a first on-off control valve are arranged on the first oil way, the second oil way is connected between the oil tank and the rod cavity, a second bidirectional pump and a second on-off control valve are arranged on the second oil way, and the control unit is used for controlling the switching valve positions of the first on-off control valve and the second on-off control valve and controlling the rotating speed and the steering of the first bidirectional pump and the second bidirectional pump. The back pressure of the oil cylinder body can be adjusted to a normal working range through the first bi-directional pump or the second bi-directional pump, so that the back pressure of the oil cylinder, the boom speed and the boom load can be effectively matched, and the phenomena of howling, boom shaking, boom dropping and the like of a control system are avoided.
Description
Technical Field
The invention belongs to the technical field of engineering machinery, and particularly relates to a boom hydraulic control system and hydraulic engineering machinery.
Background
The control of the arm support is mostly realized through a multi-way valve and a balance valve in a hydraulic system, the multi-way valve can control the direction and the speed of the action of the arm support, the balance valve can provide load maintenance, the direction and the size of the load born by an oil cylinder can be changed along with the change of the gesture in the movement process of the arm support, under the condition, the condition that the back pressure of the oil cylinder is too large or too small easily occurs, the function of the balance valve is in an abnormal working interval, the speed and the load of the arm support cannot be effectively matched, and then the phenomena of howling, arm support shaking, arm drop and the like of the hydraulic system are easily caused in the use process.
Disclosure of Invention
The invention provides a boom hydraulic control system and hydraulic engineering machinery, aiming at solving the technical problems that the back pressure of an oil cylinder in the existing boom hydraulic control system cannot be actively regulated and the hydraulic system cannot be always in a stable working interval, so that the hydraulic system is easy to be abnormal in the use process.
In order to achieve the above purpose, the invention provides a boom hydraulic control system, which comprises an oil cylinder body, a first oil way, a second oil way and a control unit, wherein the oil cylinder body comprises a rod cavity and a rodless cavity, the first oil way is connected between an oil tank and the rodless cavity, a first bidirectional pump and a first on-off control valve are arranged on the first oil way, the second oil way is connected between the oil tank and the rod cavity, a second bidirectional pump and a second on-off control valve are arranged on the second oil way, the control unit is used for controlling the switching valve positions of the first on-off control valve and the second on-off control valve, and controlling the rotating speed and the steering of the first bidirectional pump and the second bidirectional pump.
In an embodiment of the invention, the control unit is configured to:
acquiring an extending execution instruction of an oil cylinder;
according to the oil cylinder extension execution instruction, the first on-off control valve and the second on-off control valve are controlled to be switched to the on valve position, the first bidirectional pump is controlled to rotate forward at a first initial speed so as to enable the rodless cavity to enter oil, and the second bidirectional pump is controlled to rotate reversely at a second initial speed so as to enable the oil with the rod cavity to flow to the oil tank;
and comparing the oil pressure of the rod cavity with a first preset pressure range of the rod cavity, and adjusting the rotating speed of the second bidirectional pump according to the comparison result.
In an embodiment of the present invention, comparing the oil pressure of the rod chamber with a first preset pressure range of the rod chamber, and adjusting the rotation speed of the second bi-directional pump according to the comparison result specifically includes:
when the oil pressure of the rod cavity is larger than the maximum value of the first preset pressure range, controlling the second bidirectional pump to accelerate reverse rotation until the oil pressure of the rod cavity is within the first preset pressure range;
when the oil pressure of the rod cavity is smaller than the minimum value of the first preset pressure range, controlling the second bidirectional pump to decelerate and reverse until the oil pressure of the rod cavity is within the first preset pressure range;
when the oil pressure of the rod cavity is within a first preset pressure range, the second bidirectional pump is controlled to maintain the current running state.
In an embodiment of the invention, the ratio of the first initial velocity to the second initial velocity is equal to the ratio of the cross-sectional area of the rod-containing chamber to the cross-sectional area of the rodless chamber.
In an embodiment of the invention, the control unit is further configured to:
acquiring an oil cylinder retraction execution instruction;
according to the oil cylinder retraction execution instruction, the first on-off control valve and the second on-off control valve are controlled to be switched to the on valve position, the first bidirectional pump is controlled to rotate reversely to enable oil in the rodless cavity to flow to the oil tank, and the second bidirectional pump is controlled to rotate positively to enable the oil in the rod cavity to enter;
and comparing the oil pressure of the rodless cavity with a second preset pressure range of the rodless cavity, and adjusting the rotating speed of the first bidirectional pump according to the comparison result.
In an embodiment of the present invention, comparing the oil pressure of the rodless chamber with a second preset pressure range of the rodless chamber, and adjusting the rotation speed of the first bi-directional pump according to the comparison result specifically includes:
when the oil pressure of the rodless cavity is larger than the maximum value of the second preset pressure range, controlling the first bidirectional pump to accelerate reverse rotation until the oil pressure of the rodless cavity is within the second preset pressure range;
when the oil pressure of the rodless cavity is smaller than the minimum value of the second preset pressure range, controlling the first bidirectional pump to perform speed reduction and reverse rotation until the oil pressure of the rodless cavity is within the second preset pressure range;
and when the oil pressure of the rodless cavity is in a second preset pressure range, controlling the first bidirectional pump to maintain the current running state.
In an embodiment of the invention, the control unit is further configured to:
acquiring an oil cylinder stopping action instruction;
and controlling the first on-off control valve and the second on-off control valve to be switched to the stop valve position according to the oil cylinder stop action instruction, and controlling the first bidirectional pump and the second bidirectional pump to stop running.
In an embodiment of the invention, the boom hydraulic control system further comprises a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is arranged on the first oil path and used for detecting the oil pressure of the rodless cavity, and the second pressure sensor is arranged on the second oil path and used for detecting the oil pressure of the rod cavity.
In an embodiment of the invention, the boom hydraulic control system further comprises a pressure relief oil circuit, wherein the pressure relief oil circuit is connected between the first oil circuit and the oil tank, and/or the pressure relief oil circuit is connected between the second oil circuit and the oil tank.
In an embodiment of the invention, the boom hydraulic control system further comprises a boom body, wherein the boom body is used for being connected with the oil cylinder body.
In order to achieve the above purpose, the invention also provides a hydraulic engineering machine, which comprises the boom hydraulic control system.
Through the technical scheme, the boom hydraulic control system provided by the embodiment of the invention has the following beneficial effects:
the first oil way and the second oil way are respectively an oil inlet way and an oil outlet way with a rod cavity and a rodless cavity, when the oil cylinder body needs to act, the control unit only needs to control the first on-off control valve and the second on-off control valve to be switched to the on valve position, then the first bidirectional pump and the second bidirectional pump are controlled to respectively conduct forward and reverse rotation, the flow direction of hydraulic oil can be controlled, and the control unit can control the oil return speed of the back pressure side of the oil cylinder body by controlling the forward rotation speed or the reverse rotation speed of the first bidirectional pump or the second bidirectional pump, so that when the load of the oil cylinder body changes, the back pressure of the oil cylinder body can be adjusted to a normal working range through the first bidirectional pump or the second bidirectional pump, the back pressure of the oil cylinder, the arm support speed and the load of the arm support can be effectively matched, and the phenomena of howling, arm support shaking, arm drop and the like of a control system are avoided.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide an understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a schematic diagram of the hydraulic section of a boom hydraulic control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a boom hydraulic control system when a boom is driven by two cylinders in an embodiment of the invention;
FIG. 3 is a first control schematic of a control unit in an embodiment according to the invention;
FIG. 4 is a second control schematic of the control unit in an embodiment according to the invention;
fig. 5 is a third control schematic diagram of the control unit in the embodiment according to the invention.
Description of the reference numerals
1. The cylinder body 11 is provided with a rod cavity
12. First oil way of rodless cavity 2
21. First on-off control valve of first two-way pump 22
3. Second oil path 31 second two-way pump
32. Control unit of second on-off control valve 4
51. First pressure sensor 52 second pressure sensor
6. Pressure relief oil way 7 oil tank
8. Arm support body
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the present invention.
The boom hydraulic control system of the present invention is described below with reference to the accompanying drawings.
The invention provides a boom hydraulic control system, as shown in fig. 1, which comprises:
the oil cylinder body 1 comprises a rod cavity 11 and a rodless cavity 12;
the first oil way 2 is connected between the oil tank 7 and the rodless cavity 12, and a first two-way pump 21 and a first on-off control valve 22 are arranged on the first oil way 2;
the second oil path 3 is connected between the oil tank 7 and the rod cavity 11, and a second bi-directional pump 31 and a second on-off control valve 32 are arranged on the second oil path 3; and
and a control unit 4 for controlling the first on-off control valve 22 and the second on-off control valve 32 to switch valve positions, and for controlling the rotation speeds and the steering directions of the first bi-directional pump 21 and the second bi-directional pump 31.
The first oil path 2 and the second oil path 3 are respectively an oil inlet and outlet path of the rodless cavity 12 and the rod cavity 11, when the oil cylinder body 1 needs to act, the control unit 4 only needs to control the first on-off control valve 22 and the second on-off control valve 32 to be switched to on valve positions, then the first bidirectional pump 21 and the second bidirectional pump 31 are controlled to respectively forward and reverse according to a preset program, the flow direction of hydraulic oil can be controlled, the control unit 4 can control the oil return speed of the back pressure side of the oil cylinder body 1 by adjusting the reversing speed of the first bidirectional pump 21 or the second bidirectional pump 31, and therefore when the load of the oil cylinder body 1 changes, the oil pressure of the back pressure side of the oil cylinder body 1 can be adjusted to a normal working range through the first bidirectional pump 21 or the second bidirectional pump 31, so that the back pressure, the arm support speed and the arm support load of the oil cylinder can be effectively matched, and the phenomena of howling, the arm support, the vibration, the arm drop and the like of a control system are avoided.
Specifically, as shown in fig. 3, in the embodiment of the present invention, the control unit 4 is configured to:
acquiring an extending execution instruction of an oil cylinder;
according to the oil cylinder extension execution instruction, the first on-off control valve 22 and the second on-off control valve 32 are controlled to be switched to the on valve position, the first bidirectional pump 21 is controlled to rotate forward at a first initial speed so as to enable the rodless cavity 12 to feed oil, and the second bidirectional pump 31 is controlled to rotate reversely at a second initial speed so as to enable the oil with the rod cavity 11 to flow to the oil tank 7;
the oil pressure of the rod chamber 11 is compared with a first preset pressure range of the rod chamber 11, and the rotation speed of the second bi-directional pump 31 is adjusted according to the comparison result.
When an operator needs to execute the cylinder extension action, an cylinder extension execution instruction is sent to the control unit 4, the control unit 4 controls the first on-off control valve 22 and the second on-off control valve 32 to be electrified to switch to the on valve position according to the cylinder extension execution instruction, meanwhile, the control unit 4 also controls the first bidirectional pump 21 to rotate positively, the second bidirectional pump 31 rotates reversely, so that hydraulic oil in the oil tank 7 flows into the rodless cavity 12 through the first oil pump and the first oil way 2, hydraulic oil in the rod cavity 11 flows back into the oil tank 7 through the second oil way 3 and the second bidirectional pump 31, the load of the cylinder body 1 is changed along with the movement of the arm support, the oil pressure of the rod cavity 11 is changed, the oil return speed of the second oil way 3 can be adjusted by controlling the reversing speed of the second bidirectional pump 31, the oil pressure can be accumulated or reduced, and the back pressure and the load self-adaption matching can be realized.
In the embodiment of the present invention, comparing the oil pressure of the rod chamber 11 with the first preset pressure range of the rod chamber 11, and adjusting the rotation speed of the second bi-directional pump 31 according to the comparison result specifically includes:
when the oil pressure of the rod cavity 11 is larger than the maximum value of the first preset pressure range, the second bidirectional pump 31 is controlled to accelerate reverse rotation until the oil pressure of the rod cavity 11 is within the first preset pressure range;
when the oil pressure of the rod cavity 11 is smaller than the minimum value of the first preset pressure range, the second bidirectional pump 31 is controlled to decelerate and reverse until the oil pressure of the rod cavity 11 is within the first preset pressure range;
when the oil pressure of the rod chamber 11 is within the first preset pressure range, the second bi-directional pump 31 is controlled to maintain the current operation state.
The oil pressure of the rod chamber 11 under the extending action is the back pressure of the oil cylinder, the oil pressure of the rod chamber 11 is represented by py, and the first preset pressure range is represented by [ py1min, py1max ], and then the specific control process of the control unit 4 is as follows: along with the change of the load of the oil cylinder, when py is detected to be greater than py1max, the control unit 4 will send a signal for accelerating the inversion to the second bi-directional pump 31, so that the outflow speed of the hydraulic oil from the rod cavity 11 is increased, the oil pressure of the rod cavity 11 will gradually decrease to a first preset pressure range, when py is detected to be less than py1min, the control unit 4 will send a signal for decelerating the inversion to the second bi-directional pump 31, so that the outflow speed of the hydraulic oil from the rod cavity 11 is reduced, the oil pressure of the rod cavity 11 will gradually accumulate and increase to the first preset pressure range, and when the oil pressure of the rod cavity 11 is within the first preset pressure range, only the second bi-directional pump 31 needs to be controlled to maintain the current running state, and the oil pressure of the rod cavity 11 will be maintained in the pressure state. Wherein, because the control unit 4 only adjusts the back pressure during adjustment, the rotation speed of the first two-way pump 21 is unchanged, the oil pressure difference of the oil cylinder body 1 can be matched with the boom speed and the load pressure only when the oil pressure of the rod cavity 11 is ensured to be within a first preset pressure range,
in the embodiment of the present invention, the ratio of the first initial velocity to the second initial velocity may be equal to the ratio of the sectional area of the rod-shaped chamber 11 to the sectional area of the rodless chamber 12, so that the balance of the oil inlet flow rate and the oil outlet flow rate of the cylinder body 1 in the initial state can be ensured. Likewise, the initial rotational speeds of the first and second bi-directional pumps 21 and 31 may be set such that the ratio of the first initial speed to the second initial speed is equal to the ratio of the cross-sectional area of the rod-shaped cavity 11 to the cross-sectional area of the rodless cavity 12 when the cylinder is retracted.
As shown in fig. 4, in an embodiment of the present invention, the control unit 4 is further configured to:
acquiring an oil cylinder retraction execution instruction;
according to the oil cylinder retraction execution instruction, the first on-off control valve 22 and the second on-off control valve 32 are controlled to be switched to the on valve positions, the first bidirectional pump 21 is controlled to reversely rotate so as to enable oil in the rodless cavity 12 to flow to the oil tank 7, and the second bidirectional pump 31 is controlled to positively rotate so as to enable the rod cavity 11 to feed oil;
the oil pressure of the rodless chamber 12 is compared with a second preset pressure range of the rodless chamber 12, and the rotation speed of the first bi-directional pump 21 is adjusted according to the comparison result.
When an operator needs to execute the retraction action of the oil cylinder body 1, an oil cylinder retraction execution instruction is sent to the control unit 4, the control unit 4 controls the first on-off control valve 22 and the second on-off control valve 32 to be electrified to switch to the on valve position according to the oil cylinder extension execution instruction, meanwhile, the control unit 4 also controls the first bidirectional pump 21 to rotate reversely, and the second bidirectional pump 31 rotates positively, so that hydraulic oil in the oil tank 7 flows into the rod cavity 11 through the second oil pump and the second oil way 3, hydraulic oil in the rodless cavity 12 flows back into the oil tank 7 through the first oil way 2 and the first bidirectional pump 21, the load of the oil cylinder body 1 is changed along with the movement of the arm support, the oil pressure of the rodless cavity 12 is changed, and the oil return speed of the first oil way 2 can be adjusted by controlling the reverse rotation speed of the first bidirectional pump 21, so that the oil pressure of the rod cavity 11 can be matched with the load pressure.
It should be noted that the forward and reverse rotation of the first and second bi-directional pumps 21 and 31 are merely a relative concept, and the forward rotation of the bi-directional pump means that oil is supplied to the corresponding rod chamber, and the reverse rotation of the bi-directional pump means that oil is discharged from the corresponding rod chamber.
In the embodiment of the present invention, comparing the oil pressure of the rodless chamber 12 with the second preset pressure range of the rodless chamber 12, and adjusting the rotation speed of the first bi-directional pump 21 according to the comparison result specifically includes:
when the oil pressure of the rodless chamber 12 is greater than the maximum value of the second preset pressure range, the first bi-directional pump 21 is controlled to accelerate the inversion until the oil pressure of the rodless chamber 12 is within the second preset pressure range;
when the oil pressure of the rodless cavity 12 is smaller than the minimum value of the second preset pressure range, the first bidirectional pump 21 is controlled to be in deceleration and inversion until the oil pressure of the rodless cavity 12 is within the second preset pressure range;
when the oil pressure of the rodless chamber 12 is within the second preset pressure range, the first bi-directional pump 21 is controlled to maintain the current operation state.
Under this action, the oil pressure of the rodless cavity 12 is the back pressure of the oil cylinder, the oil pressure of the rodless cavity 12 is represented by pw, and the second preset pressure range is represented by [ pw1min, pw1max ], and then the specific control process of the control unit 4 is as follows: along with the change of the load of the oil cylinder, when pw is detected to be larger than pw1max, the control unit 4 can send a signal for accelerating inversion to the first bidirectional pump 21, so that the outflow speed of the hydraulic oil of the first oil path 2 is increased, the oil pressure of the rodless cavity 12 can be gradually reduced to a second preset pressure range, when pw is detected to be smaller than pw1min, the control unit 4 can send a signal for decelerating inversion to the first bidirectional pump 21, so that the outflow speed of the hydraulic oil of the first oil path 2 is reduced, the oil pressure of the rodless cavity 12 can be gradually accumulated and increased to the second preset pressure range, when the oil pressure of the rodless cavity 12 is positioned in the second preset pressure range, the first bidirectional pump 21 is controlled to maintain the current running state, so that the oil pressure of the rodless cavity 12 is maintained, and the oil pressure difference of the oil cylinder body 1 in the state can be adaptively matched with the load pressure.
As shown in fig. 5, in an embodiment of the present invention, the control unit 4 is further configured to:
acquiring an oil cylinder stopping action instruction;
the first on-off control valve 22 and the second on-off control valve 32 are controlled to switch to the off-valve positions according to the cylinder stop action command, and the first bi-directional pump 21 and the second bi-directional pump 31 are controlled to stop operation.
That is, when the cylinder does not need to perform an operation, the control unit 4 controls the first and second on-off control valves 22 and 32 to be switched to the off-valve positions, and controls the first and second bi-directional pumps 21 and 31 to stop operating.
In the embodiment of the present invention, the first bi-directional pump 21 and the second bi-directional pump 31 may be driven by bi-directional motors, respectively, and the control unit 4 only needs to control the rotation speed and the steering direction of the motors.
As shown in fig. 1, in the embodiment of the present invention, the boom hydraulic control system further includes a first pressure sensor 51 and a second pressure sensor 52, the first pressure sensor 51 being provided on the first oil passage 2 and configured to detect the oil pressure of the rodless chamber 12, and the second pressure sensor 52 being provided on the second oil passage 3 and configured to detect the oil pressure of the rod chamber 11. The first pressure sensor 51 and the second pressure sensor 52 are disposed near the rodless chamber 12 and the rod-less chamber 11, respectively, and the first pressure sensor 51 and the second pressure sensor 52 are communicatively connected to the control unit 4, and the control unit 4 can monitor the oil pressures of the rod-less chamber 11 and the rod-less chamber 12 in real time through the first pressure sensor 51 and the second pressure sensor 52.
As shown in fig. 1, in the embodiment of the present invention, the boom hydraulic control system further includes a relief oil passage 6, the relief oil passage 6 being connected between the first oil passage 2 and the oil tank 7, and/or the relief oil passage 6 being connected between the second oil passage 3 and the oil tank 7. Specifically, the first on-off control valve 22 is disposed between the first bi-directional pump 21 and the rodless cavity 12, the second on-off control valve 32 is disposed between the second bi-directional pump 31 and the rod cavity 11, one end of the pressure relief oil path 6 is connected with the oil tank 7, the other end is further branched and provided with two connecting ends, the two connecting ends are respectively connected to the first oil path 2 between the first on-off control valve 22 and the first bi-directional pump 21, and the second oil path 3 between the second on-off control valve 32 and the second bi-directional pump 31, and the pressure relief oil path 6 is shared by the first oil path 2 and the second oil path 3, so that the pressure relief can be safely performed on the first oil path 2 and the second oil path 3 under the premise of ensuring the brief introduction of the system, and of course, the two oil paths can be used for releasing oil through the independent pressure relief oil path 6.
As shown in fig. 2, in the embodiment of the present invention, the boom hydraulic control system further includes a boom body 8, where the boom body 8 is used to connect with the cylinder body 1. The boom body 8 may be driven by one oil cylinder or by a plurality of oil cylinders, and the hydraulic control system of the boom is described below with reference to a specific embodiment of driving the boom body 8 by two oil cylinders.
As shown in fig. 2, when the arm support body 8 is extended by the double cylinder driving arm support, the control unit 4 controls the two first bi-directional pumps 21 to rotate forward and the two second bi-directional pumps 31 to rotate backward, the ratio of the forward rotation speed and the reverse rotation speed of the two sets of bi-directional pumps may be set such that the ratio of the first initial speed to the second initial speed is equal to the ratio of the sectional area of the rod chamber 11 to the sectional area of the rodless chamber 12, so that the two cylinder bodies 1 are extended at the same speed, then the back pressures py of the two cylinder bodies 1 are monitored respectively, and the two py are compared with the first preset pressure ranges py1min and py1max respectively, and when py of at least one of the cylinder bodies 1 is greater than py1max or less than py1min, the corresponding second bi-directional pump 31 is controlled to accelerate the reverse rotation or decelerate the reverse rotation to adjust py to the first preset pressure ranges py1min and py1max, and similarly, the similar control steps are performed when the cylinder is retracted. For a system in which two or more cylinders drive the boom body 8 to act, when the boom acts, the load or unbalanced load of each cylinder body 1 will be different, so that the extending or retracting speeds of the cylinder bodies 1 are not synchronous, and the back pressure of each cylinder body 1 is respectively regulated and controlled by a plurality of first bidirectional pumps 21 and second bidirectional pumps 31 in one-to-one correspondence, so that the back pressure of each cylinder body 1 can be adaptively regulated according to the self-demand, and therefore, multiple cylinders can adaptively regulate the back pressure according to the self load or unbalanced load, and the situations of unbalanced load vibration, clamping stagnation and the like of the cylinders are avoided.
In order to achieve the above purpose, the invention also provides a hydraulic engineering machine, which comprises the boom hydraulic control system. The hydraulic engineering machinery can be a crane, an excavator, a pump truck and the like, and has at least the beneficial effects brought by the above embodiments because the hydraulic engineering machinery adopts all the technical schemes of the above embodiments, and the detailed description is not repeated here.
In summary, the boom hydraulic control system in the invention separately controls the pressure of the rod cavity 11 and the rodless cavity 12 of the oil cylinder body 1 through two bidirectional pumps, so that the back pressure of the oil cylinder body 1 can be stabilized in a proper range under various postures and different loads of the boom body 8, thereby realizing the self-adaptive matching of the rotation speed of the pumps, the boom speed and the load pressure, and effectively solving the problem of boom dropping caused by the shake or insufficient back pressure of the oil cylinder during the starting and stopping of the boom and the load changing of the boom; meanwhile, the invention uses two bidirectional pumps to replace the original reversing valve and balance valve, which can effectively reduce the throttle loss of the system, and make the system efficiency higher and save more energy; furthermore, the control system is simple in structure, and each oil cylinder can be independently adjusted when the arm support is driven by multiple cylinders, so that compound control is easier to realize, and the problem of unbalanced load of the arm support caused by asynchronous multiple cylinders can be solved.
In the embodiment of the invention, the on-off control valve can be a two-position two-way valve, and can be replaced by a two-position three-way valve or an electric control ball valve.
In the embodiment of the present invention, the motor for driving the bi-directional pump may be a servo motor, a synchronous motor, or the like.
In the embodiment of the present invention, the hydraulic pump may be a gear pump or a fixed displacement pump such as a vane pump.
In the embodiment of the present invention, the relief valve on the relief oil passage 6 may be a direct-acting type, a pilot type, a manual type, an electric control proportional type, or the like.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Although embodiments of the present invention have been described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the present invention, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present invention.
Claims (11)
1. The utility model provides a cantilever crane hydraulic control system which characterized in that, cantilever crane hydraulic control system includes:
the oil cylinder body (1) comprises a rod cavity (11) and a rodless cavity (12);
the first oil way (2) is connected between the oil tank (7) and the rodless cavity (12), and a first bidirectional pump (21) and a first on-off control valve (22) are arranged on the first oil way (2);
the second oil way (3) is connected between the oil tank (7) and the rod cavity (11), and a second two-way pump (31) and a second on-off control valve (32) are arranged on the second oil way (3); and
and the control unit (4) is used for controlling the switching valve positions of the first on-off control valve (22) and the second on-off control valve (32) and controlling the rotating speeds and the rotating directions of the first bidirectional pump (21) and the second bidirectional pump (31).
2. The boom hydraulic control system of claim 1, wherein the control unit is configured to:
acquiring an extending execution instruction of an oil cylinder;
according to the oil cylinder extension execution instruction, the first on-off control valve (22) and the second on-off control valve (32) are controlled to be switched to a conduction valve position, the first bidirectional pump (21) is controlled to rotate positively at a first initial speed to enable the rodless cavity (12) to enter oil, and the second bidirectional pump (31) is controlled to rotate reversely at a second initial speed to enable the oil in the rod cavity (11) to flow to the oil tank (7);
the oil pressure of the rod cavity (11) is compared with a first preset pressure range of the rod cavity (11), and the rotating speed of the second bidirectional pump (31) is adjusted according to the comparison result.
3. Boom hydraulic control system according to claim 2, characterized in that comparing the oil pressure of said rod chamber (11) with a first preset pressure range of said rod chamber (11), and adjusting the rotational speed of said second bi-directional pump (31) according to the comparison result comprises in particular:
when the oil pressure of the rod cavity (11) is larger than the maximum value of the first preset pressure range, controlling the second bidirectional pump (31) to accelerate reverse rotation until the oil pressure of the rod cavity (11) is in the first preset pressure range;
when the oil pressure of the rod cavity (11) is smaller than the minimum value of the first preset pressure range, controlling the second bidirectional pump (31) to decelerate and reversely rotate until the oil pressure of the rod cavity (11) is within the first preset pressure range;
when the oil pressure of the rod cavity (11) is in the first preset pressure range, the second bidirectional pump (31) is controlled to maintain the current running state.
4. Boom hydraulic control system according to claim 2, characterized in that the ratio of the first initial speed and the second initial speed is equal to the ratio of the cross-sectional area of the rod-shaped cavity (11) to the cross-sectional area of the rodless cavity (12).
5. The boom hydraulic control system of claim 1, wherein the control unit is further configured to:
acquiring an oil cylinder retraction execution instruction;
according to the oil cylinder retraction execution instruction, the first on-off control valve (22) and the second on-off control valve (32) are controlled to be switched to a conduction valve position, the first bidirectional pump (21) is controlled to reversely rotate so as to enable oil in the rodless cavity (12) to flow to the oil tank (7), and the second bidirectional pump (31) is controlled to positively rotate so as to enable the rodless cavity (11) to feed oil;
the oil pressure of the rodless chamber (12) is compared with a second preset pressure range of the rodless chamber (12), and the rotation speed of the first bi-directional pump (21) is adjusted according to the comparison result.
6. Boom hydraulic control system according to claim 5, characterized in that comparing the oil pressure of the rodless chamber (12) with a second preset pressure range of the rodless chamber (12), and adjusting the rotational speed of the first bi-directional pump (21) according to the comparison result specifically comprises:
when the oil pressure of the rodless cavity (12) is larger than the maximum value of the second preset pressure range, controlling the first bidirectional pump (21) to accelerate reverse rotation until the oil pressure of the rodless cavity (12) is in the second preset pressure range;
when the oil pressure of the rodless cavity (12) is smaller than the minimum value of the second preset pressure range, controlling the first bidirectional pump (21) to rotate reversely in a speed reducing way until the oil pressure of the rodless cavity (12) is within the second preset pressure range;
when the oil pressure of the rodless cavity (12) is within the second preset pressure range, the first bidirectional pump (21) is controlled to maintain the current running state.
7. The boom hydraulic control system of claim 1, wherein the control unit is further configured to:
acquiring an oil cylinder stopping action instruction;
and controlling the first on-off control valve (22) and the second on-off control valve (32) to be switched to a cut-off valve position according to the oil cylinder stopping action instruction, and controlling the first bi-directional pump (21) and the second bi-directional pump (31) to stop running.
8. Boom hydraulic control system according to any of claims 1-7, characterized in that it further comprises a first pressure sensor (51) and a second pressure sensor (52), said first pressure sensor (51) being arranged on said first oil circuit (2) for detecting the oil pressure of said rodless chamber (12), said second pressure sensor (52) being arranged on said second oil circuit (3) for detecting the oil pressure of said rod-fed chamber (11).
9. Boom hydraulic control system according to any of claims 1-7, characterized in that it further comprises a pressure relief oil circuit (6), said pressure relief oil circuit (6) being connected between said first oil circuit (2) and said oil tank (7) and/or said pressure relief oil circuit (6) being connected between said second oil circuit (3) and said oil tank (7).
10. Boom hydraulic control system according to any of claims 1-7, characterized in that it further comprises a boom body (8), said boom body (8) being adapted to be connected to said cylinder body (1).
11. Hydraulic working machine, characterized in that it comprises a boom hydraulic control system according to any of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311125792.0A CN117329180A (en) | 2023-09-01 | 2023-09-01 | Arm support hydraulic control system and hydraulic engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311125792.0A CN117329180A (en) | 2023-09-01 | 2023-09-01 | Arm support hydraulic control system and hydraulic engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117329180A true CN117329180A (en) | 2024-01-02 |
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ID=89274555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311125792.0A Pending CN117329180A (en) | 2023-09-01 | 2023-09-01 | Arm support hydraulic control system and hydraulic engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117329180A (en) |
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2023
- 2023-09-01 CN CN202311125792.0A patent/CN117329180A/en active Pending
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