CN117682450A - Heavy-load lifting hydraulic system, distributed heavy-load lifting hydraulic assembly and control method - Google Patents
Heavy-load lifting hydraulic system, distributed heavy-load lifting hydraulic assembly and control method Download PDFInfo
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Abstract
The invention discloses a heavy-load lifting hydraulic system, which comprises a hydraulic control unit oil tank unit, a control unit and a lifting oil cylinder assembly, wherein the hydraulic control unit oil tank unit comprises an oil tank, a high-pressure pump set arranged in the oil tank, the high-pressure pump set comprises a three-phase asynchronous motor and a high-pressure proportional variable pump, the control unit comprises an oil supply branch connected with the high-pressure pump set and an oil return branch used for regulating and controlling working state selection and safety pressure, an oil inlet high-pressure filter is arranged on the oil supply branch, and a first electromagnetic unloading valve is arranged on the oil return branch; the outlet of the first electromagnetic unloading valve is connected with an oil return filter through an oil way, and the oil return filter is connected with an oil tank; by adopting the hydraulic system, different lifting cylinders can be independently and synchronously controlled in a stable manner from different starting points in the lifting process of the platform, and when one lifting cylinder receives unexpected resistance, the lifting cylinder can be automatically stopped and recovered. The system has standard modularized arrangement, integrated installation, capability of setting a plurality of systems to be parallel according to different shapes and weights, unified control and high safety.
Description
Technical Field
The invention belongs to the technical field of heavy-load hydraulic lifting, and particularly relates to a heavy-load lifting hydraulic system, a distributed heavy-load lifting hydraulic assembly and a control method.
Background
Along with the increasing market demands of large heavy-load lifting structural members, particularly the increasing demands of heavy-load lifting structural members, such as marine equipment and large bridges, are increased, and the demands of heavy-load lifting structural members and load transfer systems are increased rapidly. And driving the lift cylinder and hydraulic control system is a key actuator of such devices. The current products have high price and long production period. Particularly for heavy-duty structural members, the number of the required jacking cylinders and the required control valve groups is large, and the cost is high; the load of the oil cylinders is large, the load among the plurality of oil cylinders is easy to be unbalanced, unexpected barriers can be generated in the lifting process, and the danger is caused by the fact that individual point positions exceed the safety pressure of the oil cylinders; the centralized pump station occupies a large space, the pipeline between the control valve group and the oil cylinder is longer, the pressure loss causes energy loss, the speed adjustment response is slower, and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a lifting oil cylinder control system which is standardized, generalized and modularized and is convenient for combined linkage.
The invention is realized in such a way, the heavy-duty lifting hydraulic system comprises a hydraulic control unit oil tank unit, a control unit and a lifting oil cylinder assembly, wherein the hydraulic control unit oil tank unit comprises an oil tank, a high-pressure pump set arranged in the oil tank, the high-pressure pump set comprises a three-phase asynchronous motor and a high-pressure proportional variable pump, the control unit comprises a high-pressure oil supply branch connected with the high-pressure pump set and an oil return branch used for regulating and controlling working state selection and safety pressure, an oil inlet high-pressure filter is arranged on the oil supply branch, and a first electromagnetic unloading valve is arranged on the oil return branch; the outlet of the first electromagnetic unloading valve is connected with an oil return filter through an oil way, and the oil return filter is connected with an oil tank;
the outlet of the oil inlet high-pressure filter is connected with an ascending oil inlet speed regulation branch, a descending oil return speed regulation branch and a rod cavity energy storage oil supply branch, the rod cavity energy storage oil supply branch is connected with N lifting oil cylinder assemblies, and the lifting oil cylinder assemblies comprise N independent lifting oil cylinder units, wherein N is more than or equal to 2;
each lifting oil cylinder unit comprises a pressure measuring point, a lifting oil cylinder, a rod cavity pressure sensor, a rodless cavity pressure sensor, a built-in displacement sensor and a pressure stabilizing energy accumulator connected with the rod cavity of the lifting oil cylinder;
the lifting oil inlet speed regulation branch is sequentially provided with a lifting oil inlet proportional direction valve for regulating lifting speed, a first pressure gauge for displaying lifting oil pressure, a first pressure sensor for detecting lifting oil pressure, a first electromagnetic bidirectional stop valve, a second electromagnetic bidirectional stop valve, a third electromagnetic bidirectional stop valve and a fourth electromagnetic bidirectional stop valve for controlling lifting action of the oil cylinder; the descending oil return speed regulation branch is sequentially provided with a descending oil return proportion direction valve for regulating the ascending speed and a first proportion overflow valve for regulating the oil return back pressure, and then oil is returned to the oil tank;
an electromagnetic directional valve enabling an energy accumulator is sequentially arranged on the rod cavity energy storage oil supply branch; the second pressure gauge is used for displaying the rod cavity energy storage oil supply pressure, and the first one-way electromagnetic stop valve, the second one-way electromagnetic stop valve, the third one-way electromagnetic stop valve and the fourth one-way electromagnetic stop valve are connected with each lifting oil cylinder unit energy accumulator;
the rod cavity energy storage oil supply branch is provided with a safety pressure branch, and the safety pressure branch is provided with a second electromagnetic unloading valve for controlling the safety pressure and unloading of the energy accumulator; the outlet of the second electromagnetic unloading valve is connected with an oil discharge path, and the oil discharge path is connected with an oil return tank;
a rodless cavity of a lifting oil cylinder of the lifting oil cylinder unit is connected with a first oil discharge one-way electromagnetic stop valve, a second oil discharge one-way electromagnetic stop valve, a third oil discharge one-way electromagnetic stop valve and a fourth oil discharge one-way electromagnetic stop valve which are connected with an oil discharge oil way and used for rapidly releasing pressure and returning oil; and the T port of the descending oil return proportional direction valve is connected in series with a first proportional overflow valve for controlling oil discharge back pressure, and a third pressure gauge and a second pressure sensor are arranged in front of the first proportional overflow valve.
The invention also discloses a distributed heavy-load lifting hydraulic assembly, which comprises M distributed heavy-load lifting hydraulic systems, wherein M is more than or equal to 2; each distributed heavy-load lifting hydraulic system corresponds to a set of PLC for controlling the lifting oil cylinder unit to act; the PLC is connected with the industrial personal computer, and the lifting oil cylinder unit of any one of the distributed heavy-load lifting hydraulic systems is regulated or controlled in an integral mode through the industrial personal computer.
The invention also discloses a control method of the distributed heavy-load lifting hydraulic assembly, wherein the control of the distributed heavy-load lifting hydraulic assembly comprises adjustment control, integral lifting control, lifting abnormal emergency control, integral descending control, resetting control and accumulator pressure supplementing control before lifting action; the specific control is as follows:
control of adjustment before the raising operation:
each lifting oil cylinder is in a retraction limit position through independent action; the specific adjustment action is as follows: the unidirectional stop valve is electrified to enable the rodless cavity to be electrified back to the oil tank, the incoming oil from the high-pressure pump source is electrified through the electromagnetic directional valve, the second electromagnetic unloading valve is electrified to enter the rod cavity energy accumulator, the lifting oil cylinder descends, the rod cavity pressure sensor is monitored to reach the pre-charging pressure, the position of the built-in displacement sensor is monitored, the lifting oil cylinder is judged to reach the retraction limit position, after the energy accumulator reaches the pre-charging pressure, the second electromagnetic unloading valve is powered off and unloaded, the electromagnetic directional valve is powered off, the unidirectional electromagnetic stop valve is powered off, and the preparation action is finished;
the position of a single lifting oil cylinder is adjusted, the starting height of a lifting structure is adapted, and the specific adjustment action is as follows: the corresponding adjusting oil cylinders are electrically controlled by selecting the direction stop valve, the opening of the proportional direction valve is adjusted to control the lifting, the opening of the proportional direction valve is adjusted to control the descending, and the descending back pressure is adjusted by adjusting the proportional overflow valve; the direction stop valve, the rising oil inlet proportional direction valve and the falling oil return joint proportional direction valve are adjusted until the contact state with the structure to be jacked is good; and so on, the lifting cylinders of all the other lifting cylinder units are adjusted to be in good contact with the supported structural member one by one, the PLC configured by each lifting cylinder unit sets the displacement of the built-in displacement sensor of each upgrading cylinder as a relative zero point, and the displacement is used as an initial reference of the action to reach a ready state before the whole action;
and (3) overall jacking control:
the lifting cylinders of the whole set of pump station synchronously ascend, the first electromagnetic bidirectional stop valve, the second electromagnetic bidirectional stop valve, the third electromagnetic bidirectional stop valve and the fourth electromagnetic bidirectional stop valve are electrified, the upper computer ascends upwards to the oil inlet proportional direction valve by a set speed displacement increment to output a speed regulation command, the displacement of the built-in displacement sensor is automatically controlled by the PLC as a reference, so that the four lifting cylinders synchronously ascend, the allowable range of the maximum relative displacement deviation of each cylinder due to different resistance in the process can be set, if the allowable range is exceeded, the proportional direction valve is closed, the ascent is automatically stopped, and the larger deviation can be gradually recovered to the normal range according to the regulation method in the regulation action; when the integral structure is lifted in place, the proportional direction valve is closed, the first electromagnetic bidirectional stop valve, the second electromagnetic bidirectional stop valve, the third electromagnetic bidirectional stop valve and the fourth electromagnetic bidirectional stop valve are powered off, and the rodless cavity enters a pressure maintaining state;
emergency control of abnormal ascending:
in the ascending process, the rodless cavity pressure and the built-in displacement sensor of each lifting oil cylinder are monitored simultaneously, when the pressure sensor or the sudden change of the pressure of the displacement sensor is detected by a certain lifting oil cylinder unit, the rodless cavity pressure abnormally fluctuates or the displacement rule suddenly stops moving, other displacement rules still normally ascend, audible and visual alarms are timely sent out, and the corresponding directional stop valve is powered off, so that when the pressure detected by the rodless cavity pressure sensor exceeds the set safety pressure, the unidirectional directional stop valve immediately gets the pressure of the rodless cavity of the lifting oil cylinder, and under the action of the energy storage pressure of the energy accumulator, the lifting oil cylinder rapidly retracts; other lifting cylinders are not affected and still continue to maintain the lifting action; when the number of the abnormal oil cylinders reaches 2, immediately adjusting the ascending oil inlet proportional directional valve to be closed, stopping the ascending action, and waiting for manually confirming the safety state;
overall descent control:
when the structural member needs to descend, the first electromagnetic bidirectional stop valve, the second electromagnetic bidirectional stop valve, the third electromagnetic bidirectional stop valve and the fourth electromagnetic bidirectional stop valve are powered on, the upper computer outputs a speed regulation command to the proportional direction valve by a set speed displacement increment, the displacement of the displacement sensor is automatically controlled by the PLC as a reference, so that the four lifting cylinders simultaneously descend, the back pressure of the proportional direction valve can be regulated by the proportional overflow valve, and the weight of the lifting structure is adapted; when the hydraulic control system is in a no-load state, the energy storage pressure of the energy accumulator can enable the oil cylinder to descend, the allowable range of the relative displacement deviation of each cylinder due to different resistance in the descending process can be set, if the allowable range is exceeded, the proportional direction valve is closed, the hydraulic control system is automatically stopped, and the deviation can be adjusted back to a normal range according to a manual adjustment method in the preparation action and then is wholly descended; when the integral structure is lowered in place, the oil return proportion lowering directional valve is closed, the first electromagnetic bidirectional stop valve, the second electromagnetic bidirectional stop valve, the third electromagnetic bidirectional stop valve and the fourth electromagnetic bidirectional stop valve are powered off, and the rodless cavity reenters a ready-to-lift state;
reset control:
if the lifting task is finished, a reset key is pressed, the first electromagnetic two-way stop valve, the second electromagnetic two-way stop valve, the third electromagnetic two-way stop valve and the fourth electromagnetic two-way stop valve are powered off, all rodless cavities are relieved, the rodless cavities retract to the limit position under the action of the energy storage pressure of the energy accumulator, the relative zero point set in the previous lifting adjustment action is canceled, and the first one-way electromagnetic stop valve, the first one-way electromagnetic stop valve and the first one-way electromagnetic stop valve are electrified for 5 seconds, so that the pressure in the energy accumulator is relieved;
accumulator pressure replenishment control:
except for the reset action, a rod cavity pressure sensor is monitored in the state of the adjustment action and the lifting action, when the pressure is found to be lower than a lower limit set value, the electromagnetic directional valve and the second electromagnetic unloading valve are powered on, the pressure is supplemented to the energy accumulator, the pressure sensor is monitored, and when the pressure reaches an upper limit set value, the electromagnetic directional valve and the second electromagnetic unloading valve are powered off.
The invention has the advantages and technical effects that: the heavy-load lifting hydraulic system comprises a hydraulic control unit oil tank unit, a control unit and a lifting oil cylinder assembly. The system adopts a high-pressure pump set which comprises a three-phase asynchronous motor and a high-pressure proportional variable pump, so that the high-efficiency energy-saving operation is realized. The control unit comprises an oil supply branch and an oil return branch for regulating and controlling the working state and the safety pressure. The lifting oil cylinder assembly consists of a plurality of independent lifting oil cylinder units, and each unit is provided with a pressure measuring point, a lifting oil cylinder, a pressure sensor, a built-in displacement sensor and a pressure stabilizing energy accumulator. The ascending oil inlet speed regulating branch and the descending oil return speed regulating branch regulate the running state of the hydraulic system, so that accurate control is realized. The rod cavity energy storage oil supply branch is connected with a plurality of lifting oil cylinder assemblies, so that the synchronism is improved, and the synchronous can be started from different starting points independently. The safety pressure branch circuit controls the safety pressure and unloading of the energy accumulator. The oil discharge oil way is connected with the rodless cavity of the lifting oil cylinder, so that quick pressure relief and oil return are realized. The system has the advantages of standard modularized arrangement, integrated installation, parallel multiple systems, unified control, high safety and the like, and can effectively ensure the stable control of speed and position in the lifting process, and automatically stop and recover when encountering resistance.
Drawings
FIG. 1 is a schematic diagram of a distributed heavy-duty lifting hydraulic system of the present invention;
FIG. 2 is a schematic diagram of a distributed heavy-duty lifting hydraulic assembly according to the present invention;
FIG. 3 is a block diagram of a multiple set control system.
In the drawing, 100, a hydraulic control unit oil tank unit;
101. an oil tank; 102. liquid level sensor 103, oil temperature sensor 104, oil absorption sensor 105, flexible connection 106, three-phase asynchronous motor 107, high pressure proportional plunger pump 108, one-way valve,
109. an oil return filter;
200. and a control unit:
201. pressure measuring point, 202, third pressure gauge, 203, second pressure sensor, 204, first proportional overflow valve, 205, second pressure gauge, 206, first electromagnetic unloading valve, 207, ascending proportional direction valve, 208, descending proportional direction valve, 209, high pressure filter, 210, electromagnetic direction valve, 211, first pressure gauge, 212, first pressure sensor, 213, second electromagnetic unloading valve, 214, second pressure gauge
215. 217, 219, 221 are all unidirectional electromagnetic shut-off valves;
216. 218, 220 and 222 are two-way electromagnetic stop valves, 223, 224, 225 and 226 are one-way electromagnetic stop valves;
300. lifting oil cylinder assembly: 310 lifting cylinder assembly, 320 lifting cylinder assembly, 330 lifting cylinder assembly, 340 lifting cylinder assembly 4;
311. 321, 331, 341 are all pressure taps;
312. 322, 332 and 342 are all lifting cylinders;
313. 323, 333, 343 are rod cavity pressure sensors;
314. 324, 334, 344 are all rodless cavity pressure sensors;
315. 325, 335, 345 are displacement sensors;
316. 326, 336, 346 are all rod-less chamber accumulator assemblies;
1. the oil tank assembly, 2, high-pressure pump group, 3, high-pressure oil supply branch, 4, full pressure and oil return branch, 5, rising oil inlet speed regulation branch, 6, falling oil return speed regulation branch, 7, rod cavity accumulator oil supply branch, 8, safe pressure branch, 9, oil discharge branch.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a heavy-duty lifting hydraulic system comprises a hydraulic control unit oil tank unit 100, a control unit 200 and a lifting oil cylinder assembly 300, wherein the hydraulic control unit oil tank unit 100 comprises an oil tank 101 and a high-pressure pump set 2 arranged in the oil tank, and the high-pressure pump set comprises a three-phase asynchronous motor 106 and a high-pressure ratio variable pump 107, so that the high-efficiency energy-saving operation of the hydraulic system can be realized; the control unit 200 comprises a high-pressure oil supply branch 3 connected with the high-pressure pump set and a full-pressure and oil return branch 4 used for regulating and controlling the working state selection, wherein an oil inlet high-pressure filter 209 is arranged on the oil supply branch, and a first electromagnetic unloading valve 206 is arranged on the safety pressure branch; the outlet of the first electromagnetic unloading valve is connected with an oil return filter 109 through an oil way, and the oil return filter is connected with an oil tank 101; the cleanliness and the efficiency of the hydraulic system can be improved;
the outlet of the oil inlet high-pressure filter 209 is connected with an oil inlet speed regulation ascending branch 5, an oil return speed regulation descending branch 6 and a rod cavity energy storage oil supply branch 7, the rod cavity energy storage oil supply branch is connected with N lifting oil cylinder assemblies 300, and the lifting oil cylinder assemblies comprise N independent lifting oil cylinder units (310, 320, 330 and 340), wherein N is more than or equal to 2; this example N is equal to 4; synchronous control of a plurality of lifting cylinders is realized, and lifting capacity and working efficiency are improved;
each lifting oil cylinder unit comprises a pressure measuring point 311, a lifting oil cylinder 312, a rod cavity pressure sensor 313, a rodless cavity pressure sensor 314, a built-in displacement sensor 315 and a pressure stabilizing energy accumulator 316 connected with the rod cavity of the lifting oil cylinder;
the lifting oil inlet speed regulation branch 5 is sequentially provided with a lifting oil inlet proportional direction valve 207 for regulating lifting speed, a first pressure gauge 211 for displaying lifting oil pressure, a first pressure sensor 212 for detecting lifting oil pressure, a first electromagnetic bidirectional stop valve 216, a second electromagnetic bidirectional stop valve 218, a third electromagnetic bidirectional stop valve 220 and a fourth electromagnetic bidirectional stop valve 222 for controlling lifting action of the oil cylinder; a descending oil return proportional direction valve 208 for adjusting the ascending speed and a first proportional overflow valve 204 for adjusting the oil return back pressure are sequentially arranged on the descending oil return speed regulation branch 6, and then oil is returned to the oil tank 101; the accurate control of the running state of the hydraulic system can be realized.
The electromagnetic directional valve 210 enabling the accumulator is sequentially arranged on the rod cavity energy storage oil supply branch 7; a second pressure gauge 214 for displaying rod cavity energy storage oil supply pressure, and a first one-way electromagnetic stop valve 223, a first one-way electromagnetic stop valve 224, a first one-way electromagnetic stop valve 225, a first one-way electromagnetic stop valve 226 connected with each lift cylinder unit accumulator; the rod cavity energy storage oil supply branch is provided with a safety pressure branch 8, and the safety pressure branch is provided with a second electromagnetic unloading valve 213 for controlling the safety pressure and unloading of the energy accumulator; the outlet of the second electromagnetic unloading valve 213 is connected with an oil discharge path 9, and the oil discharge path is connected with oil return; the hydraulic system is used for controlling the safety pressure and unloading of the energy accumulator and can ensure the safety performance of the hydraulic system.
The rodless cavity of the lifting cylinder unit is connected with a first oil discharge one-way electromagnetic stop valve 215, a second oil discharge one-way electromagnetic stop valve 217, a third oil discharge one-way electromagnetic stop valve 219 and a fourth oil discharge one-way electromagnetic stop valve 221 which are connected with an oil discharge oil way 9, so that the lifting cylinder unit is used for rapidly releasing pressure and returning oil, and the operation efficiency of a hydraulic system can be improved; the descending oil return proportional direction valve 208 connected with the descending oil return speed regulation branch 6 is used for controlling the descending speed, the T port of the descending oil return proportional direction valve 208 is connected in series with the first proportional relief valve 204 and used for controlling the oil discharge back pressure, accurate control of the oil discharge back pressure of the hydraulic system can be achieved, and the third pressure gauge 202 and the second pressure sensor 203 are arranged in front of the first proportional relief valve 204.
The invention also discloses a distributed heavy-load lifting hydraulic assembly, which comprises M distributed heavy-load lifting hydraulic systems, wherein M is more than or equal to 2, and M is equal to 4 in the embodiment;
each distributed heavy-load lifting hydraulic system corresponds to a set of PLC for controlling the lifting oil cylinder unit to act; the PLC is connected with the industrial personal computer, and the lifting oil cylinder unit of any one of the distributed heavy-load lifting hydraulic systems is regulated or controlled in an integral mode through the industrial personal computer.
The invention also discloses a control method of the distributed heavy-load lifting hydraulic assembly, wherein the control of the distributed heavy-load lifting hydraulic assembly comprises adjustment control, integral lifting control, lifting abnormal emergency control, integral descending control, resetting control and accumulator pressure supplementing control before lifting action; the specific control is as follows:
control of adjustment before the raising operation:
each lifting oil cylinder is in a retraction limit position through independent action; the specific adjustment action is as follows: the unidirectional stop valve 215 is electrified to enable the rodless cavity to be electrified back to the oil tank, the incoming oil from the high-pressure pump source is electrified through the electromagnetic directional valve 210, the second electromagnetic unloading valve 213 is electrified to enter the rod cavity energy accumulator 316, the lifting oil cylinder 312 descends, the rod cavity pressure sensor 313 is monitored to reach the pre-charging pressure, the position of the built-in displacement sensor 315 is monitored, after the lifting oil cylinder is judged to reach the retraction limit position and the energy accumulator reaches the pre-charging pressure, the second electromagnetic unloading valve 213 is powered off and unloaded, the electromagnetic directional valve 210 is powered off, the unidirectional electromagnetic stop valve 215 is powered off, and the preparation action is finished;
the position of a single lifting oil cylinder is adjusted, the starting height of a lifting structure is adapted, and the specific adjustment action is as follows: the corresponding adjusting oil cylinder is electrically controlled by selecting the direction stop valve 215, the opening of the proportional direction valve 207 is adjusted to control the lifting, the opening of the proportional direction valve 208 is adjusted to control the descending, and the descending back pressure is adjusted by adjusting the proportional overflow valve 204; the direction stop valve 215, the rising oil inlet proportional direction valve 207 and the falling oil return joint proportional direction valve 208 are adjusted until the contact state with the structure to be jacked is good; and so on, the lifting cylinders (320, 330, 340) of all the other lifting cylinder units are adjusted to be in good contact with the structure to be jacked one by one, the PLC configured by each lifting cylinder unit sets the displacement of the built-in displacement sensor of each upgrading cylinder as a relative zero point, and the displacement is used as an initial reference of the action to reach a ready state before the whole action;
and (3) overall jacking control:
the lifting cylinders of the whole set of pump station synchronously ascend, the first electromagnetic bidirectional stop valve 216, the second electromagnetic bidirectional stop valve 218, the third electromagnetic bidirectional stop valve 220 and the fourth electromagnetic bidirectional stop valve 222 are powered on, the upper computer ascends upwards to the oil inlet proportional direction valve 207 with set speed displacement increment to output a speed regulation command, the displacement quantity of the built-in displacement sensor is automatically controlled by the PLC as a reference, so that the four lifting cylinders synchronously ascend, the allowable range of the maximum relative displacement deviation of each cylinder with different resistance in the process can be set, if the allowable range is exceeded, the proportional direction valve is closed, the ascent is automatically stopped, and the larger deviation can be gradually recovered to the normal range according to the regulation method in the regulation action; when the integral structure is lifted in place, the proportional directional valve 207 is closed, the first electromagnetic bidirectional stop valve 216, the second electromagnetic bidirectional stop valve 218, the third electromagnetic bidirectional stop valve 220 and the fourth electromagnetic bidirectional stop valve 222 are powered off, and the rodless cavity enters a pressure maintaining state;
emergency control of abnormal ascending:
in the ascending process, the rodless cavity pressure (314, 324, 334, 344) and the built-in displacement sensor (315, 325, 335, 345) of each lifting cylinder (310, 320, 330, 340) are monitored simultaneously, when the pressure sensor 314 or the pressure mutation of the displacement sensor 315 is detected by one lifting cylinder unit, the rodless cavity pressure abnormally fluctuates or the displacement ruler suddenly stops moving, other displacement rulers still ascend normally, an audible and visual alarm is sent out in time, the corresponding direction stop valve 216 is powered off, and when the pressure detected by the rodless cavity pressure sensor 319 exceeds the set safety pressure, the pressure of the rodless cavity of the lifting cylinder 312 is immediately discharged by the unidirectional direction stop valve 215, and the lifting cylinder rapidly retracts under the action of the energy storage pressure of the energy accumulator; other lifting cylinders are not affected and still continue to maintain the lifting action; when the number of the abnormal oil cylinders reaches 2, immediately adjusting the rising oil inlet proportional directional valve 207 to be closed, stopping the rising action, and waiting for the manual confirmation of the safety state;
overall descent control:
when the structural member needs to descend, the first electromagnetic bidirectional stop valve 216, the second electromagnetic bidirectional stop valve 218, the third electromagnetic bidirectional stop valve 220 and the fourth electromagnetic bidirectional stop valve 222 are powered on, the upper computer outputs a speed regulation command to the proportional directional valve 208 in a set speed displacement increment, the displacement of the displacement sensor is automatically controlled by the PLC as a reference, so that the four lifting cylinders simultaneously descend, the back pressure of the proportional directional valve can be regulated by the proportional overflow valve 204, and the weight of the lifting structure is adapted; in the no-load state, the energy storage pressure of the energy accumulator can enable the oil cylinder to descend, the allowable range of the relative displacement deviation of each cylinder due to different resistance in the descending process can be set, if the allowable range is exceeded, the proportional direction valve 208 is closed, the automatic stop is realized, and the deviation can be adjusted back to the normal range according to the manual adjustment method in the preparation action and then the whole descending is realized; when the integral structure is lowered into place, the oil return proportion lowering direction valve 208 is closed, the first electromagnetic bidirectional stop valve 216, the second electromagnetic bidirectional stop valve 218, the third electromagnetic bidirectional stop valve 220 and the fourth electromagnetic bidirectional stop valve 222 are powered off, and the rodless cavity is reentered into a ready-to-lift state;
reset control:
if the lifting task is finished, a reset key is pressed, the first electromagnetic bidirectional stop valve 216, the second electromagnetic bidirectional stop valve 218, the third electromagnetic bidirectional stop valve 220 and the fourth electromagnetic bidirectional stop valve 222 are powered off, all rodless cavities are relieved, the rodless cavities are retracted to the limit position under the action of the energy storage pressure of the energy storage device, the relative zero point set in the previous lifting adjustment action is canceled, and the first one-way electromagnetic stop valve 223, the first one-way electromagnetic stop valve 224, the first one-way electromagnetic stop valve 225 and the first one-way electromagnetic stop valve 226 are powered on for 5 seconds, so that the pressure in the energy storage device is relieved;
accumulator pressure replenishment control:
in addition to the reset operation, rod cavity pressure sensors (313, 323, 333, 343) are monitored in the above adjustment operation and lifting operation states, when the lower limit set value is found, the electromagnetic directional valve 210 and the second electromagnetic unloading valve 213 are powered up, the pressure is supplemented to the accumulator, the pressure sensors are monitored, and when the upper limit set value is reached, the electromagnetic directional valve 210 and the second electromagnetic unloading valve 213 are powered down.
The technical scheme adopted by the invention has the following advantages:
1. the system has the advantages of low cost, standardized installation, high safety, effective guarantee of stable control of speed and position states of integral lifting in the lifting process of the structure, synchronous and reliable start-stop state of the platform structure, and guarantee of safe pressure of the oil cylinder without overload under any condition.
2. The system has the functions of safety overpressure protection of the rodless cavity and the rod cavity, adjustable speed of lifting speed, real-time monitoring of pressure and position and the like. The single action and the linkage control mode are organically combined, and each lifting oil cylinder and the load are combined and then are lifted in a linkage way by combining different shapes of the heavy-load structure.
3. Each set of oil control source and valve making group are integrally installed and are arranged near the lifting oil cylinder, so that space and connecting pipelines are saved, response speed is improved, pressure loss is reduced, and energy is saved.
4. And safety valves are arranged in the upper cavity and the lower cavity of each lifting hydraulic cylinder, so that the pressure safety of the rodless cavity and the rod cavity of the oil cylinder is ensured under any condition.
5. Each set of system oil source is a proportional variable pump, and two proportional directional valves are arranged on the branches of the rodless cavity control valve group, so that the speed can be stepless regulated, and the flexible control can be realized.
6. The rod cavity oil supply branch of each set of control valve group is provided with a directional stop valve, the effect of stabilizing load is achieved during the lifting action, and if the lifting process encounters an obstacle or accidents, a single oil cylinder can quickly retract by utilizing the pressure of the energy accumulator without completely retracting.
7. Each group of oil cylinders is provided with a displacement sensor and a pressure sensor, so that the pressure and position state of each lifting oil cylinder can be monitored.
8. Each hydraulic system can be used in a modularized combination mode, a proper number of lifting cylinders are configured according to the weight of a load, and a hydraulic station is arranged nearby the driving cylinders. And each set of system is communicated through network cable connection, is uniformly controlled, and is convenient for module combination expansion.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. The utility model provides a heavy load lift hydraulic system, includes hydraulic control unit oil tank unit (100), control unit (200), lift cylinder assembly (300), its characterized in that: the hydraulic control unit oil tank unit (100) comprises an oil tank (101), a high-pressure pump set arranged in the oil tank, the high-pressure pump set comprises a three-phase asynchronous motor (106) and a high-pressure proportional variable pump (107), the control unit (200) comprises a high-pressure oil supply branch (3) connected with the high-pressure pump set and a full-pressure and oil return branch (4) used for regulating and controlling working state selection, an oil inlet high-pressure filter (209) is arranged on the oil supply branch, and a first electromagnetic unloading valve (206) is arranged on the oil return branch; the outlet of the first electromagnetic unloading valve is connected with an oil return filter (109) through an oil way, and the oil return filter is connected with an oil tank (101);
the outlet of the oil inlet high-pressure filter (209) is connected with an ascending oil inlet speed regulating branch (5), a descending oil return speed regulating branch (6) and a rod cavity energy storage oil supply branch (7), the rod cavity energy storage oil supply branch is connected with N lifting oil cylinder assemblies (300), and the lifting oil cylinder assemblies comprise N independent lifting oil cylinder units, wherein N is more than or equal to 2;
each lifting oil cylinder unit comprises a pressure measuring point (311), a lifting oil cylinder (312), a rod cavity pressure sensor (313), a rodless cavity pressure sensor (314), a built-in displacement sensor (315) and a pressure stabilizing energy accumulator (316) connected with the rod cavity of the lifting oil cylinder;
the lifting oil inlet speed regulation branch circuit (5) is sequentially provided with a lifting oil inlet proportional direction valve (207) for regulating lifting speed, a first pressure gauge (211) for displaying lifting oil pressure, a first pressure sensor (212) for detecting lifting oil pressure, a first electromagnetic bidirectional stop valve (216), a second electromagnetic bidirectional stop valve (218), a third electromagnetic bidirectional stop valve (220) and a fourth electromagnetic bidirectional stop valve (222) for controlling lifting action of the oil cylinder; a descending oil return proportional direction valve (208) for adjusting the ascending speed and a first proportional overflow valve (903) for adjusting the oil return back pressure are sequentially arranged on the descending oil return speed regulation branch (6), and then oil is returned to the oil tank (101);
an electromagnetic directional valve (210) for enabling the energy accumulator is sequentially arranged on the rod cavity energy storage oil supply branch circuit (7); a second pressure gauge (214) for displaying the rod cavity energy storage oil supply pressure, and a first one-way electromagnetic stop valve (223), a second one-way electromagnetic stop valve (224), a third one-way electromagnetic stop valve (225) and a fourth one-way electromagnetic stop valve (226) which are connected with each lifting oil cylinder unit energy accumulator;
the rod cavity energy storage oil supply branch is provided with a safety pressure branch (8), and the safety pressure branch is provided with a second electromagnetic unloading valve (213) for controlling the safety pressure and unloading of the energy accumulator; the outlet of the second electromagnetic unloading valve (213) is connected with an oil discharge path (9), and the oil discharge path is connected with oil return;
a rodless cavity of a lifting oil cylinder of the lifting oil cylinder unit is connected with a first oil discharge one-way electromagnetic stop valve (215), a second oil discharge one-way electromagnetic stop valve (217), a third oil discharge one-way electromagnetic stop valve (219) and a fourth oil discharge one-way electromagnetic stop valve (221) which are connected with an oil discharge oil way (9) and used for quick pressure relief and oil return; and a descending oil return proportional direction valve (208) connected with the descending oil return speed regulation branch circuit (6) is used for controlling the descending speed, a T-port of the descending oil return proportional direction valve (208) is connected in series with a second proportional overflow valve (204) and used for controlling the oil discharge back pressure, and a third pressure gauge (202) and a second pressure sensor (203) are arranged in front of the second proportional overflow valve (204).
2. The utility model provides a distributed heavy load lift hydraulic assembly which characterized in that: the distributed heavy-duty lifting hydraulic assembly comprises M distributed heavy-duty lifting hydraulic systems according to any one of the claims 1 to 2, wherein M is more than or equal to 2;
each distributed heavy-load lifting hydraulic system corresponds to a set of PLC for controlling the lifting oil cylinder unit to act; the PLC is connected with the industrial personal computer, and the lifting oil cylinder unit of any one of the distributed heavy-load lifting hydraulic systems is regulated or controlled in an integral mode through the industrial personal computer.
3. The control method based on the distributed heavy-duty lifting hydraulic assembly of claim 2, is characterized by comprising the following steps: the control of the distributed heavy-load lifting hydraulic assembly comprises adjustment control, integral lifting control, lifting abnormal emergency control, integral descending control, resetting control and accumulator pressure supplementing control before lifting action; the specific control is as follows:
control of adjustment before the raising operation:
each lifting oil cylinder is in a retraction limit position through independent action; taking a lift cylinder assembly (310) as an example, the specific adjustment actions are: the unidirectional direction stop valve (215) is electrified to enable the rodless cavity to be electrified back to the oil tank, incoming oil from the high-pressure pump source is electrified through the electromagnetic direction valve (210), the second electromagnetic unloading valve (213) is electrified to enter the rod cavity energy accumulator (316), the lifting oil cylinder (312) descends, the rod cavity pressure sensor (313) is monitored to reach the pre-charging pressure, the position of the built-in displacement sensor (315) is monitored, the lifting oil cylinder is judged to reach the retraction limit position, after the energy accumulator reaches the pre-charging pressure, the second electromagnetic unloading valve (213) is powered off to unload, the electromagnetic direction valve (210) is powered off, the unidirectional electromagnetic stop valve (215) is powered off, and the preparation action is finished;
the position of a single lifting oil cylinder is adjusted, the starting height of a lifting structure is adapted, and the specific adjustment action is as follows: the corresponding adjusting oil cylinder is controlled by selecting a direction stop valve (215), the opening of the proportional direction valve (207) is adjusted to control the lifting, the opening of the proportional direction valve (208) is adjusted to control the descending, and the descending back pressure is adjusted by adjusting the proportional overflow valve (204); the direction stop valve (215), the rising oil inlet proportional direction valve (207) and the falling oil return joint proportional direction valve (208) are adjusted until the contact with the structure to be jacked is good; and so on, the lifting cylinders of all the other lifting cylinder units are adjusted to be in good contact with the supported structural member one by one, the PLC configured by each lifting cylinder unit sets the displacement of the built-in displacement sensor of each upgrading cylinder as a relative zero point, and the displacement is used as an initial reference of the action to reach a ready state before the whole action;
and (3) overall jacking control:
the lifting cylinders of the whole set of pump station synchronously ascend, the first electromagnetic bidirectional stop valve (216), the second electromagnetic bidirectional stop valve) (218), the third electromagnetic bidirectional stop valve (220) and the fourth electromagnetic bidirectional stop valve (222) are powered on, the upper computer ascends the oil inlet proportional direction valve (207) with set speed displacement increment to output a speed regulation command, the displacement of the built-in displacement sensor is automatically controlled by the PLC as a reference, so that four lifting cylinders synchronously ascend, the allowable range of the maximum relative displacement deviation of each cylinder with different resistance in the process can be set, if the allowable range is exceeded, the proportional direction valve is closed, the ascent is automatically stopped, and at the moment, the larger deviation can be gradually recovered to the normal range according to the regulation method in the regulation action; when the integral structure rises in place, the proportional directional valve (207) is closed, the first electromagnetic bidirectional stop valve (216), the second electromagnetic bidirectional stop valve (218), the third electromagnetic bidirectional stop valve (220) and the fourth electromagnetic bidirectional stop valve (222) are powered off, and the rodless cavity enters a pressure maintaining state;
emergency control of abnormal ascending:
in the rising process, the rodless cavity pressure and the built-in displacement sensor of each lifting oil cylinder are monitored simultaneously, when the pressure sensor or the pressure mutation of the displacement sensor is detected by a certain lifting oil cylinder unit, the pressure of the rodless cavity abnormally fluctuates or the displacement rule suddenly stops moving, other displacement rules still rise normally, audible and visual alarms are timely sent out, the corresponding direction stop valve (216) is powered off, and when the pressure detected by the rodless cavity pressure sensor (319) exceeds the set safety pressure at the moment, the unidirectional direction stop valve (215) immediately electrically removes the pressure of the rodless cavity of the lifting oil cylinder (312), and the lifting oil cylinder rapidly retracts under the action of the energy storage pressure of the energy accumulator; other lifting cylinders are not affected and still continue to maintain the lifting action; when the number of the abnormal oil cylinders reaches 2, immediately adjusting the ascending oil inlet proportional directional valve (207) to be closed, stopping the ascending action, and waiting for the manual confirmation of the safety state;
overall descent control:
when the structural member needs to descend, the first electromagnetic bidirectional stop valve (216), the second electromagnetic bidirectional stop valve (218), the third electromagnetic bidirectional stop valve (220) and the fourth electromagnetic bidirectional stop valve (222) are powered on, the upper computer outputs a speed regulation command to the proportional direction valve (208) in a set speed displacement increment, the displacement of the displacement sensor is automatically controlled by the PLC as a reference, so that the four lifting cylinders simultaneously descend, and the back pressure of the proportional direction valve can be regulated by the proportional overflow valve (204) to adapt to the weight of the lifting structure; when the hydraulic control system is in a no-load state, the energy storage pressure of the energy accumulator can enable the oil cylinder to descend, the allowable range of the relative displacement deviation of each cylinder due to different resistances in the descending process can be set, if the allowable range is exceeded, the proportional direction valve (208) is closed, the hydraulic control system is automatically stopped, and the deviation can be adjusted back to a normal range according to a manual adjustment method in the preparation action and then is wholly descended; when the integral structure is lowered in place, the oil return proportion lowering direction valve (208) is closed, the first electromagnetic bidirectional stop valve (216), the second electromagnetic bidirectional stop valve) (218), the third electromagnetic bidirectional stop valve (220) and the fourth electromagnetic bidirectional stop valve (222) are powered off, and the rodless cavity is reentered into a ready-to-lift state;
reset control:
if the lifting task is finished, a reset key is pressed, the first electromagnetic bidirectional stop valve (216), the second electromagnetic bidirectional stop valve) (218), the third electromagnetic bidirectional stop valve (220) and the fourth electromagnetic bidirectional stop valve (222) are powered off, all rodless cavities are relieved, the rodless cavities are retracted to the limit position under the action of the energy storage pressure of the energy storage device, the relative zero point arranged in the previous lifting adjustment action is canceled, and the first one-way electromagnetic stop valve (223), the first one-way electromagnetic stop valve (224), the first one-way electromagnetic stop valve (225) and the first one-way electromagnetic stop valve (226) are electrically delayed for 5 seconds, so that the pressure in the energy storage device is relieved;
accumulator pressure replenishment control:
except for the reset action, a rod cavity pressure sensor is monitored in the adjustment action and lifting action states, when the pressure sensor is found to be lower than a lower limit set value, the electromagnetic directional valve (210) and the second electromagnetic unloading valve (213) are powered on, the pressure is supplemented to the energy accumulator, the pressure sensor is monitored, and when the pressure sensor reaches an upper line set value, the electromagnetic directional valve (210) and the second electromagnetic unloading valve (213) are powered off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311784997.XA CN117682450A (en) | 2023-12-22 | 2023-12-22 | Heavy-load lifting hydraulic system, distributed heavy-load lifting hydraulic assembly and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311784997.XA CN117682450A (en) | 2023-12-22 | 2023-12-22 | Heavy-load lifting hydraulic system, distributed heavy-load lifting hydraulic assembly and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117682450A true CN117682450A (en) | 2024-03-12 |
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ID=90138825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311784997.XA Pending CN117682450A (en) | 2023-12-22 | 2023-12-22 | Heavy-load lifting hydraulic system, distributed heavy-load lifting hydraulic assembly and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117682450A (en) |
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2023
- 2023-12-22 CN CN202311784997.XA patent/CN117682450A/en active Pending
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