CN111439691B - Slewing device hydraulic control system and engineering machinery - Google Patents
Slewing device hydraulic control system and engineering machinery Download PDFInfo
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- CN111439691B CN111439691B CN202010303871.6A CN202010303871A CN111439691B CN 111439691 B CN111439691 B CN 111439691B CN 202010303871 A CN202010303871 A CN 202010303871A CN 111439691 B CN111439691 B CN 111439691B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/84—Slewing gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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Abstract
The invention relates to the technical field of engineering machinery hydraulic pressure, in particular to a slewing device hydraulic control system and engineering machinery. The hydraulic control system of the slewing device comprises a slewing device, a base hydraulic control loop and a first reversing valve; the base hydraulic control loop is arranged between two oil cavities of the slewing device to drive the slewing device to slew; the first reversing valve is arranged between the rotary device and the oil supply end of the base hydraulic control loop; when the base hydraulic control loop is in a state of supplying oil to the rotary device and the rotary device starts to rotate in the forward direction, the first reversing valve is opened, so that the two oil cavities of the rotary device can be communicated with the oil supply end of the base hydraulic control loop. The engineering machine comprises the hydraulic control system of the slewing device, so that the slewing device is prevented from slewing in the opposite direction at the moment of starting, the slewing safety of the slewing device is improved, the stable action of the slewing device is realized, and the influence of the technical level of an operator on the slewing stability is reduced.
Description
Technical Field
The invention relates to the technical field of engineering machinery hydraulic pressure, in particular to a slewing device hydraulic control system and engineering machinery.
Background
In the hydraulic rotation of the crawler crane, an operator pushes a rotary valve core to open by controlling a hydraulic control handle so as to push a rotary system to operate, but the system has the following problems:
when the crawler crane is on a ramp and is under the working condition of a heavy-load long arm support, on one hand, at the moment of opening the brake, the upper vehicle is pulled by the ramp resistance to move downwards, so that the crawler crane has the risk of overturning; on the other hand, when the turning system adopts the turning pressure with small opening degree to drive the getting-on vehicle to turn uphill, namely to turn upwards against the ramp resistance, the turning pressure is not enough to overcome the ramp resistance, so that the getting-on vehicle moves in the opposite direction.
Disclosure of Invention
The invention provides a hydraulic control system for a slewing device, which aims to solve the technical problem that in the prior art, when the slewing device is used on a ramp, reverse slewing occurs due to the influence of the resistance of the ramp.
A second object of the present invention is to provide a construction machine, which solves the technical problem of reverse rotation caused by the effect of ramp resistance when a slewing device of a construction machine in the prior art is used on a ramp to a certain extent.
In order to achieve the above object, the present invention provides the following technical solutions;
based on the first purpose, the invention provides a hydraulic control system of a rotary device, which comprises the rotary device, a base hydraulic control loop and a first reversing valve;
the base hydraulic control loop is arranged between two oil cavities of the slewing device to drive the slewing device to slew; the first reversing valve is arranged between the rotary device and the oil supply end of the base hydraulic control loop;
when the base hydraulic control loop is in a state of supplying oil to the rotary device and the rotary device starts to rotate, the first reversing valve is opened, so that the two oil chambers of the rotary device can be communicated with the oil supply end of the base hydraulic control loop through the first reversing valve.
In the above technical solution, optionally, the hydraulic control system of the slewing device further includes a slewing angle measuring device and a data processing device;
the rotation angle measuring device is connected with the rotating device to measure the rotation angle of the rotating device;
the first reversing valve is an electromagnetic valve, and the data processing device is respectively in communication connection with the first reversing valve and the rotation angle measuring device;
the data processing device can judge whether the slewing device starts to slew in the forward direction or not according to whether the slewing angle has a forward preset increment or not so as to control whether the first reversing valve reverses or not.
In any of the above technical solutions, optionally, the hydraulic control system of the slewing device further includes a three-way shuttle valve, and two inlets of the three-way shuttle valve are respectively communicated with two oil chambers of the slewing device;
the first reversing valve is a two-position two-way reversing valve, and an outlet of the three-way shuttle valve is communicated with an inlet of the first reversing valve.
In any of the above technical solutions, optionally, the base hydraulic control circuit includes a second direction valve, and the second direction valve is a three-position six-way direction valve;
the second reversing valve is arranged between the rotary device and an oil source of the base hydraulic control loop; when the second reversing valve is switched to a first position, the base hydraulic control loop drives the slewing device to slew clockwise; when the second reversing valve is switched to a second position, the base hydraulic control loop stops supplying oil to the rotary device; when the second reversing valve is switched to a third position, the base hydraulic control loop drives the slewing device to slew anticlockwise.
In any of the above technical solutions, optionally, the second reversing valve is a pilot electromagnetic valve, and both the two hydraulic control ends of the second reversing valve are provided with pressure sensors capable of measuring pilot pressures of the hydraulic control ends;
the data processing device is in communication connection with the pressure sensor, the data processing device can compare the pilot pressure with a preset pressure, and when the pilot pressure is larger than the preset pressure, the data processing device indicates that the base hydraulic control loop is in a state of supplying oil to the rotary device.
In any of the above technical solutions, optionally, after the state where the pilot pressure is less than the preset pressure continues for at least a preset time period, the data processing device controls the first directional valve to close.
In any of the above technical solutions, optionally, the base hydraulic control circuit further includes two check valves, outlets of the two check valves are respectively communicated with two oil chambers of the slewing device;
when the second reversing valve is located at the second position, the inlets of the two one-way valves are communicated with the outlet of the first reversing valve through the second reversing valve.
In any of the above technical solutions, optionally, when the second direction changing valve is switched to the second position, the outlet of the first direction changing valve is communicated with the oil return end of the base hydraulic control circuit through the second direction changing valve.
In view of the second object, the present invention provides a construction machine including the slewing device hydraulic control system according to any one of the above-mentioned technical solutions.
In any of the above technical solutions, optionally, the engineering machine further includes an upper vehicle and a lower vehicle, and the revolving device of the revolving device hydraulic control system is connected between the upper vehicle and the lower vehicle, so that the upper vehicle performs a revolving motion relative to the lower vehicle.
By adopting the technical scheme, the invention has the beneficial effects that:
according to the hydraulic control system of the rotary device, when the base hydraulic control loop is in the state of supplying oil to the rotary device and the rotary device starts to rotate in the forward direction, the first reversing valve is opened, so that the two oil cavities of the rotary device can be communicated with the oil supply end of the base hydraulic control loop, and the hydraulic control system of the rotary device is in a free sliding rotation mode. On the first hand, the slewing device is enabled to acquire enough time to establish the slewing pressure, the phenomenon that the slewing device is started to rotate in the opposite direction in the moment due to the fact that the automatic slip mode is started too early is avoided, the slewing safety of the slewing device is improved, and therefore the basic hydraulic control loop can not be forced to rotate in the opposite direction due to the fact that the opening degree of the slewing pressure is too small under the working condition that the slewing device is driven by small opening degrees. In the second aspect, after the slewing device starts slewing, the first reversing valve is communicated with the oil supply end of the base hydraulic control loop, so that the pressure maintaining function of the slewing device is not interfered, and the slewing device is ensured to normally and continuously perform forward slewing action. In the third aspect, at the moment when the base hydraulic control loop stops supplying oil to the rotary device, the hydraulic resistance function of the oil supply end is lost, and one oil cavity with larger oil pressure in the two oil cavities of the rotary device is released without obstruction through the first reversing valve, so that the impact caused by sudden pressure increase of the rotary device at the moment of braking can be buffered; and through the mode that first switching-over valve does not have the hindrance pressure release, compare in the technical scheme who adopts the overflow valve, the pressure release is timely, therefore can realize slewer steady operation, reduces the influence of operator technical merit to gyration stationarity.
The engineering machinery provided by the invention comprises the slewing device hydraulic control system, so that all the beneficial effects of the slewing device hydraulic control system can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram illustrating a first state of a hydraulic control system of a slewing device according to an embodiment of the present invention;
fig. 2 is a second state schematic diagram of a hydraulic control system of a slewing device according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a third state of a hydraulic control system of a slewing device according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a fourth state of a hydraulic control system of a slewing device according to an embodiment of the present invention;
fig. 5 is a control schematic diagram of a hydraulic control system of a slewing device according to an embodiment of the present invention.
Icon: 1-a slewing device hydraulic control system; 10-a first directional valve; 11-a turning gear; 12-a three-way shuttle valve; 13-a second reversing valve; 130-a first pilot control end; 131-a second hydraulic control end; 14-oil supply end; 15-oil return end; 16-a one-way valve; 17-a data processing device; 18-a pressure sensor; 19-rotation angle measuring device.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 1 to 5, the present embodiment provides a hydraulic control system for a slewing device; fig. 1 is a schematic diagram of a first state of a hydraulic control system of a slewing device according to the present embodiment, which is a hydraulic schematic diagram of the hydraulic control system of the slewing device in a forward slewing state; fig. 2 is a schematic diagram of a second state of the hydraulic control system of the slewing device according to the present embodiment, which is a hydraulic schematic diagram of the hydraulic control system of the slewing device in a reverse slewing state; fig. 3 is a schematic diagram of a third state of the hydraulic control system of the slewing device according to the present embodiment, which is a schematic diagram of the hydraulic control system of the slewing device in the buffering stage after braking; fig. 4 is a schematic diagram of a fourth state of the hydraulic control system of the slewing device according to the present embodiment, which is a schematic diagram of the hydraulic control system of the slewing device after the buffering stage after braking is finished; fig. 5 is a control schematic diagram of a hydraulic control system of a slewing device according to the present embodiment.
The hydraulic control system of the slewing device provided by the embodiment is used for engineering machinery.
Referring to fig. 1 to 5, the slewing device hydraulic control system 1 provided in the present embodiment includes a slewing device 11, a base hydraulic control circuit, and a first directional control valve 10.
The base hydraulic control circuit is disposed between two oil chambers of the slewing device 11 to drive the slewing device 11 to slew, and specifically, the start, stop, direction, speed, and the like of the slewing motion of the slewing device 11 can be controlled by the base hydraulic control circuit.
The first directional control valve 10 is disposed between the slewing device 11 and the oil supply end 14 of the base hydraulic control circuit. Optionally, the first direction valve 10 is a two-position two-way direction valve, when the first direction valve 10 is switched to its first working position, the inlet and the outlet of the first direction valve 10 are communicated, that is, the first direction valve 10 is in an open state, and when the first direction valve 10 is switched to its second working position, the inlet and the outlet of the first direction valve 10 are cut off, that is, the first direction valve 10 is in a closed state.
Referring specifically to fig. 1 and 2, when the base hydraulic control circuit is in a state of supplying oil to the slewing device 11 and sufficient slewing pressure is not yet built inside the slewing device 11, under the reverse pulling action of an external load such as ramp resistance, the slewing pressure of the slewing device 11 may not be sufficient to overcome the action of the reverse load, so that the slewing device 11 tends to slew in the reverse direction. Therefore, before the slewing device 11 starts to perform forward slewing, the closed state of the first reversing valve 10 is maintained, a sufficient pressure build-up time can be provided for the slewing device 11, until the slewing pressure of the slewing device 11 is enough to overcome the reverse pulling load to start to perform forward slewing, and the first reversing valve 10 is opened, so that two oil chambers of the slewing device 11 can be communicated with the oil supply end 14 of the base hydraulic control loop through the first reversing valve 10, and the slewing device hydraulic control system 1 is enabled to enter a free-slip mode.
Through setting up first switching-over valve 10, on the first hand, make slewer 11 acquire enough time and establish gyration pressure, avoid too early opening automatic slip-turn mode to lead to slewer 11 to turn round in the opposite direction in the twinkling of an eye in the start, improved slewer 11's gyration security, so can also make basic hydraulic control return circuit under the operating mode that adopts little aperture drive slewer 11, also can not lead to being forced reverse gyration owing to gyration pressure aperture undersize yet. In the second aspect, after the swing device 11 starts to swing, the oil supply end of the base hydraulic control circuit is communicated through the first direction changing valve, and the pressure of the oil supply end is sufficiently high to form a hydraulic resistance for preventing the swing device 11 from being decompressed, so that the automatic sliding mode is still in a standby state even though the automatic sliding mode is started, the pressure maintaining function of the swing device 11 is not hindered, and the swing device 11 is ensured to normally and continuously perform forward swing action. In a third aspect, the slewing device 11 is always in a free-slip mode after starting forward slewing, at the moment when the base hydraulic control circuit stops supplying oil to the slewing device 11, the oil supply end 14 of the base hydraulic control circuit is disconnected from both the slewing device 11 and the first reversing valve 10, so that the hydraulic resistance of the oil supply end 14 is lost, one oil chamber with higher oil pressure in the two oil chambers of the slewing device 11 is released through the first reversing valve 10 without hindrance, and further, the impact caused by sudden pressure increase of the slewing device 11 at the moment of braking can be buffered; and through the mode that first switching-over valve 10 does not have the hindrance pressure release, compare in the technical scheme who adopts the overflow valve, this slewer hydraulic control system 1 has abandoned the technical scheme that only can the pressure release at slewer 11's oil pocket pressure is greater than the set pressure of overflow valve, regard the fuel feeding state of basic hydraulic control return circuit and slewer 11's gyration state as the condition of opening of free slip mode, thereby as long as make first switching-over valve 10 and fuel feeding end 14 disconnection, can directly get into the pressure release state, avoid the untimely condition of pressure release to appear, therefore can realize slewer 11 steady action, reduce the influence of operator's technical merit to gyration stationarity.
It is to be emphasized that the state in which the base hydraulic control circuit supplies oil to the slewing device 11 is the first condition, the state in which the slewing device 11 has started slewing is the second condition, and the free-slip mode cannot be activated only when both the first condition and the second condition are satisfied, that is, when either one of the first condition and the second condition is not satisfied.
In an alternative of this embodiment, the slewing device hydraulic control system 1 further includes a slewing angle measuring device 19 and a data processing device 17. The data processing device 17 may be a controller, a computer, or the like having a data processing function.
The turning angle measuring device 19 is connected to the turning device 11 to measure the turning angle of the turning device 11. Optionally, the swivel angle measuring device 19 is an angle measuring sensor.
Alternatively, the turning angle measuring device 19 is provided directly inside the turning device 11 to measure the turning angle of the turning device 11; alternatively, the turning angle measuring device 19 measures the relative turning angles of two members connected to the stator and the rotor of the turning device 11, respectively, to measure the turning angle of the turning device 11.
Referring to fig. 5, the first direction valve 10 is an electromagnetic valve, and the data processing device 17 is in communication connection with the first direction valve 10 and the rotation angle measuring device 19, respectively. The data processing device 17 can judge whether the slewing device 11 starts slewing or not according to whether the slewing angle has a forward preset increment or a reverse preset increment so as to control whether the first reversing valve 10 reverses or not.
Specifically, the angle of the turning device 11 at the initial position is β0On the basis, if the variation of the turning angle is not less than the forward preset increment or the reverse preset increment, it indicates that the oil supplied by the base hydraulic control circuit has built up pressure in the oil chamber of the turning device 11, i.e. indicates that the turning device 11 starts turning, and if the base hydraulic control circuit is still in the state of supplying oil to the turning device 11 at this time, the data processing device 17 controls the first reversing valve 10 to open. The incremental monitoring result of the rotation angle is used as a condition for judging whether the rotation device 11 starts to rotate, so that the parameters are intuitive, accurate and easy to obtain, the judgment logic of the data processing device 17 is simplified, and the response efficiency of the first reversing valve 10 is improved. This manner of determining by the swivel angle is advantageous in that the resulting amount rather than the intermediate amount is used as the determination, as compared to the manner of determining whether the oil pressure inside the swivel device 11 is sufficient to drive the swivel device 11 to start the normal swivel, based on the oil pressure levels of the two oil chambers of the swivel device 11And the condition is interrupted, so that the accuracy of the judgment result is improved, and the rotation stability and the safety of the rotating device 11 are further improved.
Optionally, when the real-time rotation angle β is not less than β0+ Δ x, also indicates that the slewing device 11 starts slewing in the forward direction, where Δ x is a preset increment.
In an alternative of this embodiment, the swing device hydraulic control system 1 further includes a three-way shuttle valve 12, two inlets of the three-way shuttle valve 12 are respectively communicated with two oil chambers of the swing device 11, and a spool of the three-way shuttle valve 12 can move between the two inlets and has a tendency to move to a side with lower oil pressure, so that an outlet of the three-way shuttle valve 12 can be communicated with one oil chamber with higher oil pressure in the two oil chambers of the swing device 11.
The first reversing valve 10 is a two-position two-way reversing valve, and the outlet of the three-way shuttle valve 12 is communicated with the inlet of the first reversing valve 10, so that the oil chamber with higher oil pressure of the rotary device 11 can be communicated with the oil supply end 14 of the basic hydraulic control loop through the three-way shuttle valve 12 and the second reversing valve 13 in sequence, and the oil discharged from the oil chamber on the side can be converged to the oil supply end 14 of the basic hydraulic control loop. Meanwhile, the outlet of the three-way shuttle valve 12 can be cut off and communicated with the oil cavity with lower oil pressure in the two oil cavities of the rotary device 11, and the pressure maintaining performance of the oil cavity on the other side can be improved. In an alternative of this embodiment, the base hydraulic control circuit includes a second directional control valve 13, and the second directional control valve 13 is a three-position six-way directional control valve.
The second directional control valve 13 is provided between the slewing device 11 and the oil source of the base hydraulic control circuit. Specifically, the oil source of the base hydraulic control circuit includes an oil supply end 14 and an oil return end 15, that is, the opening and closing of the oil supply and oil return passages of the base hydraulic control circuit to the slewing device 11 are controlled by the second reversing valve 13.
When the second reversing valve 13 is switched to the first position, the base hydraulic control loop drives the rotating device 11 to rotate clockwise; when the second reversing valve 13 is switched to the second position, the base hydraulic control loop stops supplying oil to the rotary device 11; when the second direction valve 13 is switched to the third position, the base hydraulic control circuit drives the slewing device 11 to slew counterclockwise.
That is, the direction in which the base hydraulic control circuit supplies oil to the slewing device 11 can also be changed by the second selector valve 13, and whether the base hydraulic control circuit is in the state of supplying oil to the slewing device 11, that is, whether the first condition is satisfied, can be determined according to the switching state of the second selector valve 13. On the basis, taking the second direction valve 13 switched to the first position as an example, if the swiveling device 11 starts to swivel clockwise, it is determined that the swiveling device 11 starts to swivel forward, that is, it is determined that the second condition is met, and conversely, if the swiveling device 11 starts to swivel counterclockwise, it is determined that the swiveling device 11 is swiveling reversely, that is, it is determined that the second condition is not met. However, in the state where the second direction switching valve 13 is switched to the third position, if the swiveling device 11 starts to swivel clockwise, it is determined that the swiveling device 11 is swiveling in the reverse direction, and the determination result is that the second condition is not met, and if the swiveling device 11 starts to swivel counterclockwise, it is determined that the swiveling device 11 is swiveling in the forward direction, and the determination result is that the second condition is met. Thus, the term "normal slewing" is a relative concept, and means that the slewing device 11 should theoretically slew in a direction that is not equivalent to an absolute "clockwise slewing" or "counterclockwise slewing" direction after the slewing pressure in the slewing device 11 is established.
In an alternative of this embodiment, referring to fig. 5, the second direction valve 13 is a pilot type solenoid valve, and both pilot ports of the second direction valve 13 are provided with pressure sensors 18, and the pressure sensors 18 can measure pilot pressures of the pilot ports.
The data processing device 17 is in communication connection with the pressure sensor 18, the data processing device 17 can compare the pilot pressure with the preset pressure, and when the pilot pressure is larger than the preset pressure, the data processing device indicates that the base hydraulic control loop is in an oil supply state to the rotary device 11. The switching operation of the second directional control valve 13 is controlled by hydraulic pressure of oil in two hydraulic control ends, specifically, the two hydraulic control ends are a first hydraulic control end 130 and a second hydraulic control end 131, when the pilot pressure is greater than a preset pressure, the pilot oil is called high-pressure pilot oil, the high-pressure pilot oil enters the first hydraulic control end 130, the second directional control valve 13 is switched to the first position, the high-pressure pilot oil enters the second hydraulic control end 131, the second directional control valve 13 is switched to the third position, and when the pilot pressure is less than the preset pressure, the second directional control valve 13 is switched to the second position. When the high-pressure pilot oil is injected into the hydraulic control end on one side, the pressure sensor 18 on the one side outputs an electric signal to the data processing device 17, and the data processing device 17 judges that the basic hydraulic control circuit is in a state of supplying oil to the slewing device 11.
The pilot pressure of the hydraulic control end is measured by the pressure sensor 18 to be used as a condition for judging whether the base hydraulic control loop is in the state of supplying oil to the rotary device 11, and the judging method is intuitive, accurate and simple and has strong adaptability.
It is to be understood that a communicative connection means being connected by wire or wirelessly so that the two communicatively connected are capable of transferring electrical signals to each other.
Alternatively, both pilot-controlled ends of the second direction valve 13 are connected to a pilot handle, so that oil can be supplied to both pilot-controlled ends of the second direction valve 13, respectively, by pushing the pilot handle.
In an alternative of this embodiment, referring to fig. 3, when the pilot pressure is lower than the preset pressure for at least a preset time, indicating that the base hydraulic control circuit has stopped supplying oil to the slewing device 11 for at least a preset time, the data processing device 17 controls the first directional valve 10 to close.
After the second direction valve 13 is switched to the second position for the preset time period, the first direction valve 10 is closed, that is, in the preset time period, although the base hydraulic control circuit stops supplying oil to the slewing device 11, the slewing device hydraulic control system 1 is still in the free-slip mode, so that the stopping impact caused by the instant that the base hydraulic control circuit stops supplying oil to the slewing device 11, namely braking, can be relieved, the slope slipping phenomenon caused by the stopping impact is avoided, and the braking safety of the slewing device hydraulic control system 1 is improved.
In an alternative of this embodiment, the base hydraulic control circuit further includes two check valves 16, and outlets of the two check valves 16 are respectively communicated with two oil chambers of the slewing device 11; when the second direction valve 13 is located at the second position, the inlets of the two check valves 16 are communicated with the outlet of the first direction valve 10 through the second direction valve 13.
By providing the two check valves 16, the hydraulic oil flowing into the swing device 11 through the second direction valve 13 can be prevented from flowing back, thereby improving the safety of the base hydraulic control circuit.
In an alternative of this embodiment, referring to fig. 4, when the second direction switching valve 13 is switched to the second position, the outlet of the first direction switching valve 10 is communicated with the return end 15 of the base pilot control circuit through the second direction switching valve 13.
Therefore, in the preset duration that the basic hydraulic control loop stops supplying oil to the slewing device 11, namely, in the braking buffer stage, the pressure relief oil of the slewing device 11 can directly converge into the oil return end 15 of the basic hydraulic control loop through the first reversing valve 10, and then can flow back to the oil tank of the slewing device hydraulic control system 1.
Optionally, the inlets of both check valves 16 communicate with the return end 15 of the base pilot control circuit.
Example two
The second embodiment provides a working machine, the second embodiment includes the slewing device hydraulic control system in the first embodiment, technical features of the slewing device hydraulic control system disclosed in the first embodiment are also applicable to the first embodiment, and technical features of the slewing device hydraulic control system disclosed in the first embodiment are not described repeatedly.
Referring to fig. 1 to 5, the construction machine provided in this embodiment includes a slewing device hydraulic control system 1.
The construction machine in this embodiment has the advantages of the slewing device hydraulic control system in the first embodiment, and the advantages of the slewing device hydraulic control system disclosed in the first embodiment are not described again here.
In an alternative of this embodiment, the swing device hydraulic control system 1 further includes an upper vehicle and a lower vehicle, and the swing device 11 of the swing device hydraulic control system 1 is connected between the upper vehicle and the lower vehicle so as to make the upper vehicle perform swing motion relative to the lower vehicle.
Specifically, on engineering machine is in the ramp, the working condition that the getting on bus is provided with the long arm of heavy load is down, get off the bus and be located the ramp, therefore the getting on bus is under the effect of ramp resistance, can apply the effort opposite with forward direction of gyration to slewer 11, lead to the getting on bus to produce the trend of taking place reverse gyration for getting off the bus, through the automatic slip mode of opening this slewer hydraulic control system 1, thereby avoid appearing slewer 11 and take place reverse gyration's the condition in the twinkling of an eye in the start, and then guarantee that the getting on bus can normally work high-efficiently, effectively reduce the risk of overturning. Meanwhile, when the engineering machinery is on a slope and the slewing device 11 is slewing with a small opening, the slewing device 11 can have enough time to build slewing pressure to overcome the resistance of the slope by starting the automatic slip mode of the hydraulic control system 1 of the slewing device, so that reverse slewing caused by over-small slewing pressure is avoided.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (9)
1. A hydraulic control system of a rotary device is characterized by comprising the rotary device, a base hydraulic control loop and a first reversing valve;
the base hydraulic control loop is arranged between two oil cavities of the slewing device to drive the slewing device to slew; the first reversing valve is arranged between the rotary device and the oil supply end of the base hydraulic control loop;
when the base hydraulic control loop is in a state of supplying oil to the rotary device and the rotary device starts to rotate forwards, the first reversing valve is opened, so that two oil cavities of the rotary device can be communicated with an oil supply end of the base hydraulic control loop through the first reversing valve;
the device also comprises a rotation angle measuring device and a data processing device;
the rotation angle measuring device is connected with the rotating device to measure the rotation angle of the rotating device;
the first reversing valve is an electromagnetic valve, and the data processing device is respectively in communication connection with the first reversing valve and the rotation angle measuring device;
the data processing device can judge whether the slewing device starts to slew in the forward direction or not according to whether the slewing angle has a forward preset increment or not so as to control whether the first reversing valve reverses or not.
2. The swing device hydraulic control system according to claim 1, further comprising a three-way shuttle valve, two inlets of the three-way shuttle valve being communicated with two oil chambers of the swing device, respectively;
the first reversing valve is a two-position two-way reversing valve, and an outlet of the three-way shuttle valve is communicated with an inlet of the first reversing valve.
3. The swing apparatus pilot control system of claim 1, wherein the base pilot control circuit includes a second directional control valve that is a three-position, six-way directional control valve;
the second reversing valve is arranged between the rotary device and an oil source of the base hydraulic control loop; when the second reversing valve is switched to a first position, the base hydraulic control loop drives the slewing device to slew clockwise; when the second reversing valve is switched to a second position, the base hydraulic control loop stops supplying oil to the rotary device; when the second reversing valve is switched to a third position, the base hydraulic control loop drives the slewing device to slew anticlockwise.
4. The slewing device hydraulic control system according to claim 3, wherein the second reversing valve is a pilot-operated solenoid valve, and both hydraulic control ends of the second reversing valve are provided with pressure sensors capable of measuring pilot pressures of the hydraulic control ends;
the data processing device is in communication connection with the pressure sensor, the data processing device can compare the pilot pressure with a preset pressure, and when the pilot pressure is larger than the preset pressure, the data processing device indicates that the base hydraulic control loop is in a state of supplying oil to the rotary device.
5. The swing device hydraulic control system according to claim 4, wherein the data processing device controls the first directional valve to close after a state in which the pilot pressure is less than a preset pressure for at least a preset time period.
6. The slewing device hydraulic-controlled system of claim 3, wherein the base hydraulic-controlled circuit further comprises two check valves, outlets of the two check valves are respectively communicated with two oil chambers of the slewing device;
when the second reversing valve is located at the second position, the inlets of the two one-way valves are communicated with the outlet of the first reversing valve through the second reversing valve.
7. The swivel device hydraulic control system of claim 6,
when the second reversing valve is switched to a second position, the outlet of the first reversing valve is communicated with the oil return end of the base hydraulic control loop through the second reversing valve.
8. A working machine comprising a slewing device pilot-controlled system according to any one of claims 1 to 7.
9. The work machine of claim 8, further comprising an upper vehicle and a lower vehicle, wherein the slewing device of the slewing device hydraulic control system is connected between the upper vehicle and the lower vehicle to cause slewing motion of the upper vehicle relative to the lower vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010303871.6A CN111439691B (en) | 2020-04-17 | 2020-04-17 | Slewing device hydraulic control system and engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010303871.6A CN111439691B (en) | 2020-04-17 | 2020-04-17 | Slewing device hydraulic control system and engineering machinery |
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| CN111439691A CN111439691A (en) | 2020-07-24 |
| CN111439691B true CN111439691B (en) | 2022-03-01 |
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| CN202010303871.6A Active CN111439691B (en) | 2020-04-17 | 2020-04-17 | Slewing device hydraulic control system and engineering machinery |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960023541A (en) * | 1994-12-08 | 1996-07-20 | 안자키 사토루 | Reverse Actuator of Hydraulic Actuator |
| CN201891687U (en) * | 2010-01-15 | 2011-07-06 | 徐州海伦哲专用车辆股份有限公司 | Rotary hydraulic system capable of realizing free slip-rotation and centering of arm bracket |
| CN202379608U (en) * | 2011-12-29 | 2012-08-15 | 徐州重型机械有限公司 | Boarding rotating hydraulic control system and crane provided with same |
| CN103206419B (en) * | 2013-04-18 | 2015-04-22 | 三一汽车起重机械有限公司 | Rotary hydraulic system and construction machinery |
| CN103244496B (en) * | 2013-05-13 | 2016-02-10 | 三一汽车起重机械有限公司 | Rotary control valve group, revolution hydraulic control system and hoist |
| CN104564885B (en) * | 2015-01-08 | 2017-04-05 | 宁波宇洲液压科技有限公司 | A kind of highly integrated Double-directional back rotary valve for pilot control pattern |
| CN105351276B (en) * | 2015-12-03 | 2017-09-19 | 徐州重型机械有限公司 | Turn round hydraulic control system, method and crane |
| CN107150955A (en) * | 2017-04-20 | 2017-09-12 | 北汽福田汽车股份有限公司 | Hydraulic system of crane and crane |
| CN107140562B (en) * | 2017-06-16 | 2019-05-21 | 徐州重型机械有限公司 | Turn round hydraulic control system, method and crane |
| CN211226103U (en) * | 2019-11-01 | 2020-08-11 | 三一汽车起重机械有限公司 | Hydraulic rotary buffering system and crane |
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