CN113387287B - Rotary limiting hydraulic system, control method thereof and working machine - Google Patents
Rotary limiting hydraulic system, control method thereof and working machine Download PDFInfo
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- CN113387287B CN113387287B CN202110662616.5A CN202110662616A CN113387287B CN 113387287 B CN113387287 B CN 113387287B CN 202110662616 A CN202110662616 A CN 202110662616A CN 113387287 B CN113387287 B CN 113387287B
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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
- B66C23/86—Slewing gear hydraulically actuated
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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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- 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
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- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention relates to the technical field of working machines, and provides a rotation limiting hydraulic system, a control method thereof and a working machine. The rotation limiting hydraulic system comprises a rotation driving mechanism, an O-shaped function reversing valve, a valve core switching assembly and a rotation angle detector; the valve core switching assembly is in communication connection with a rotation angle detector, and the rotation angle detector is used for detecting the rotation angle of a rotation device driven by the rotation driving mechanism; the rotary driving mechanism is connected with the O-shaped functional reversing valve, and the O-shaped functional reversing valve is provided with a first working position, a middle position and a second working position. The rotation limiting hydraulic system can realize automatic limiting of rotation of the rotation device.
Description
Technical Field
The invention relates to the technical field of working machines, in particular to a rotation limiting hydraulic system, a control method thereof and a working machine.
Background
When the existing open system crane is stopped in rotation, the upper crane can freely scratch and rotate relative to the lower crane. Some users do not need the function, but need to get on and off the vehicle in the rotation process, and stop the vehicle at the moment. The rotation angle of the crane is controlled by manually operating a handle, and once the rotation angle exceeds a working angle interval, the rotation function is closed immediately. The manual operation can be adapted to the construction site to the greatest extent. However, manual control requires a lot of effort, and the driver operates in a tired state, which has potential safety hazards, and particularly in places with narrow construction space, safety accidents are easy to occur.
Disclosure of Invention
The invention provides a rotation limiting hydraulic system, a control method thereof and an operation machine, which are used for solving the problems that in the prior art, the rotation angle of a crane on a car needs manual operation control and construction safety hazards exist.
The invention provides a rotation limiting hydraulic system, which comprises a rotation driving mechanism, an O-shaped function reversing valve, a valve core switching assembly and a rotation angle detector, wherein the O-shaped function reversing valve is arranged on the valve core switching assembly; the valve core switching assembly is in communication connection with the rotation angle detector, and the rotation angle detector is used for detecting the rotation angle of a rotation device driven by the rotation driving mechanism;
the rotary driving mechanism is connected with the O-shaped function reversing valve; the valve core switching assembly can switch the O-shaped function reversing valve from the current working position to the middle position.
According to the rotation limiting hydraulic system provided by the invention, the valve core switching assembly comprises a first switching valve and a second switching valve, and the O-shaped function reversing valve comprises a first pilot oil port corresponding to the first working position and a second pilot oil port corresponding to the second working position; the first switching valve is connected with the first pilot oil port, the second switching valve is connected with the second pilot oil port, and the first switching valve and the second switching valve are respectively connected with the rotation angle detector in a communication manner;
in the power-off state of the first switching valve, the first pilot oil port is communicated with an oil inlet of the first switching valve; in the power-on state of the first switching valve, the first pilot oil port is communicated with an oil tank through the first switching valve; the second pilot oil port is communicated with an oil inlet of the second switching valve in the power-off state of the second switching valve; and in the power-on state of the second switching valve, the second pilot oil port is communicated with the oil tank through the second switching valve.
According to the rotation limiting hydraulic system provided by the invention, the rotation limiting hydraulic system further comprises an operating handle, and the oil inlet of the first switching valve and the oil inlet of the second switching valve are respectively connected with the operating handle.
According to the rotation limiting hydraulic system provided by the invention, the O-shaped functional reversing valve further comprises a first unloading port and a second unloading port which are mutually communicated, the O-shaped functional reversing valve is in a neutral state, the first unloading port is communicated with a hydraulic oil source, the second unloading port is communicated with an oil tank, and the O-shaped functional reversing valve is in a first working position state or a second working position state, and the first unloading port and the second unloading port are in a closed state.
According to the rotation limiting hydraulic system provided by the invention, the rotation limiting hydraulic system further comprises a first one-way valve and a second one-way valve, wherein the first one-way valve is arranged on a communicating pipeline between a first working oil port of the rotation driving mechanism and an oil tank, the second one-way valve is arranged on a communicating pipeline between a second working oil port of the rotation driving mechanism and the oil tank, and an inlet of the first one-way valve and an inlet of the second one-way valve are both communicated with an outlet of the oil tank.
According to the rotation limiting hydraulic system provided by the invention, the rotation limiting hydraulic system further comprises an overflow valve, wherein the overflow valve is arranged on a connecting pipeline between an oil inlet of the O-shaped function reversing valve and an oil tank.
The invention also provides a control method of any one of the rotation limiting hydraulic systems, which comprises the following steps:
acquiring the rotation angle of the rotation device detected by the rotation angle detector;
and controlling the valve core switching assembly to switch the O-shaped function reversing valve from the current working position to the middle position according to the rotation angle and the preset rotation angle range.
According to the control method of the rotation limiting hydraulic system provided by the invention, the rotation angle comprises a first-direction rotation angle and a second-direction rotation angle, the preset rotation angle range is an angle range between the first-direction preset rotation angle and the second-direction preset rotation angle, and the first switching valve and the second switching valve are in a normally-off state;
according to the rotation angle and the preset rotation angle range, the valve core switching assembly is controlled to switch the O-shaped function reversing valve from the current working position to the middle position, and the method comprises the following steps:
if the first direction rotation angle exceeds the first direction preset rotation angle, controlling the first switching valve to be electrified;
and if the second direction rotation angle exceeds the second direction preset rotation angle, controlling the second switching valve to be electrified.
The invention also provides a working machine which comprises a slewing device and any one of the slewing limiting hydraulic systems, wherein the driving end of the slewing driving mechanism is in driving connection with the slewing device.
The working machine comprises an upper vehicle and a lower vehicle, wherein the rotation driving mechanism is arranged on the lower vehicle, and the rotation device is the upper vehicle.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a swing limit hydraulic system provided by the present invention;
FIG. 2 is a schematic flow chart of a control method of the swing limit hydraulic system provided by the invention;
reference numerals:
1. a swing driving mechanism; 11. A first working oil port; 12. A second working oil port;
2. an O-shaped function reversing valve; 3. A valve core switching assembly; 31. A first switching valve;
32. a second switching valve; 4. A hydraulic oil source; 5. An oil tank;
6. a hydraulic pump; 71. A first one-way valve; 72. A second one-way valve;
8. an overflow valve; 9. A pressure sensor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In describing embodiments of the present invention, it should be noted that the terms "first" and "second" are used for clarity in describing the numbering of the product components and do not represent any substantial distinction unless explicitly stated or defined otherwise. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The swing limit hydraulic system and the control method thereof of the present invention are described below with reference to fig. 1 to 2.
Fig. 1 is a schematic structural diagram of a rotation limiting hydraulic system provided by the invention. The invention provides a rotation limiting hydraulic system which comprises a rotation driving mechanism 1, an O-shaped function reversing valve 2, a valve core switching assembly 3 and a rotation angle detector. The spool switching assembly 3 is in communication with the angle of rotation detector. The swing angle detector detects a swing angle of the swing device driven by the swing drive mechanism 1.
The rotary driving mechanism 1 is connected with an O-shaped function reversing valve 2. The O-ring switching valve 2 has a first operating position, a neutral position and a second operating position. The spool switching assembly 3 can switch the O-ring function switching valve 2 from the current operating position to the neutral position.
The rotation limiting hydraulic system further comprises a controller, and the valve core switching assembly 3 and the rotation angle detector are respectively in communication connection with the controller. The controller is used for controlling the valve core switching assembly 3 to act according to the rotation angle of the rotation device.
The rotation limiting hydraulic system further comprises a hydraulic pump 6, and the hydraulic pump 6 is in power connection with the rotation driving mechanism 1 through an O-shaped function reversing valve 2. Specifically, the O-type function switching valve 2 includes an oil inlet P, an oil return port T, a first switching port a, and a second switching port B. An inlet of the hydraulic pump 6 is communicated with the hydraulic oil source 4, an outlet of the hydraulic pump 6 is communicated with the oil inlet P, and the hydraulic pump 6 provides hydraulic power from the hydraulic oil source 4 to the slewing drive mechanism 1. The oil return port T is communicated with the oil tank 5. The first reversing port A is communicated with a first working oil port 11 of the rotary driving mechanism 1, and the second reversing port B is communicated with a second working oil port 12 of the rotary driving mechanism 1.
When the O-shaped functional reversing valve 2 is in the middle position, the oil inlet P, the oil return port T, the first reversing port A and the second reversing port B are all closed. The swing drive mechanism 1 stops swinging, and the swing device stops at the current position and cannot swing under the action of external force.
When the O-shaped functional reversing valve 2 is in the first working position, the oil inlet P is communicated with the first reversing port A, and the oil return port T is communicated with the second reversing port B. The hydraulic oil sequentially flows through the oil inlet P, the first reversing port A and the first working oil port 11 of the rotary driving mechanism 1 and then reaches the rotary driving mechanism 1, so that the rotary driving mechanism 1 can be driven to rotate in a first direction, namely the rotary device is driven to rotate in the first direction. The return oil of the rotary driving mechanism 1 sequentially flows through the second working oil port 12, the second reversing port B and the return oil port T and then returns to the oil tank.
When the O-shaped function reversing valve 2 is in the second working position, the oil inlet P is communicated with the second reversing port B, and the oil return port T is communicated with the first reversing port A. The hydraulic oil sequentially flows through the oil inlet P, the second reversing port B and the second working oil port 12 of the rotary driving mechanism 1 and then reaches the rotary driving mechanism 1, so that the rotary driving mechanism 1 is driven to rotate in a second direction, namely the rotary device is driven to rotate in the second direction. The return oil of the rotary driving mechanism 1 sequentially flows through the first working oil port 11, the first reversing port A and the return oil port T and then returns to the oil tank.
In the process that the rotating device rotates in any direction, the controller receives the rotating angle information of the rotating device in real time, and controls the valve core switching assembly 3 to adjust the valve core position of the O-shaped functional reversing valve 2 according to the rotating angle information, so that the O-shaped functional reversing valve 2 is switched from a first working position or a second working position to a middle position, and the rotating in any direction is prevented from exceeding a preset rotating angle.
The system can preset the rotation interval of the rotation device. The turning interval may be between a maximum angle of turning in the first direction and a maximum angle of turning in the second direction. Wherein the second direction is the opposite direction of the first direction.
When the O-type direction valve 2 is in the first operation position, the angle at which the turning device turns in the first direction is adjusted by adjusting the valve element opening of the O-type direction valve 2. If the rotation angle of the rotation device exceeds the preset rotation angle in the first direction, the valve element of the O-shaped function switching valve 2 is switched to the middle position through the valve element switching assembly 3. The rotation device is restricted from continuously rotating towards the first direction, and the rotation angle of the rotation device is prevented from exceeding a preset rotation interval.
When the O-type reversing valve 2 is in the second operating position, the angle at which the slewing device is slewing in the second direction is adjusted by adjusting the valve element opening of the O-type reversing valve 2. If the rotation angle of the rotation device exceeds the preset rotation angle in the second direction, the valve element of the O-shaped function switching valve 2 is switched to the middle position through the valve element switching assembly 3. The rotation device is restricted from continuously rotating towards the second direction, and the rotation angle of the rotation device is prevented from exceeding a preset rotation interval.
According to the rotation limiting hydraulic system provided by the invention, the O-shaped functional reversing valve 2 is arranged, the pilot oil port of the O-shaped functional reversing valve 2 is connected with the valve core switching assembly 3, the valve core switching assembly 3 can limit the rotation interval of the O-shaped functional reversing valve 2 according to the rotation angle information of the rotation device detected by the rotation angle detector, the rotation angle of the rotation device is prevented from exceeding the set angle interval, and the automatic rotation limiting of the rotation device is realized.
In the embodiment of the present invention, the spool switching assembly 3 includes a first switching valve 31 and a second switching valve 32. The O-type function switching valve 2 includes a first pilot port corresponding to a first operation position and a second pilot port corresponding to a second operation position. The first switching valve 31 is connected with the first pilot oil port, the second switching valve 32 is connected with the second pilot oil port, and the first switching valve 31 and the second switching valve 32 are respectively connected with the rotation angle detector in a communication mode.
In the power-off state of the first switching valve 31, the first switching valve 31 is in the upper working state in fig. 1, and the first pilot oil port is communicated with the oil inlet of the first switching valve 31. In the power-on state of the first switching valve 31, the first switching valve 31 is in the lower operating state in fig. 1, and the first pilot port is communicated with the tank 5 through the first switching valve 31. In the power-off state of the second switching valve 32, the second switching valve 32 is in the upper working state in fig. 1, and the second pilot oil port is communicated with the oil inlet of the second switching valve 32. In the second switching valve 32 in the power-on state, the second switching valve 32 is in the lower operating state in fig. 1, and the second pilot port is communicated with the tank 5 through the second switching valve 32.
The present embodiment limits the maximum turning angle of the turning device in the first direction by the turning angle detector and the first switching valve 31. The maximum turning angle of the turning device in the second direction is limited by the turning angle detector and the second switching valve 32.
Specifically, when the swing driving mechanism 1 swings in the first direction, if it is detected that the swing angle of the swing device exceeds the preset swing angle in the first direction, the spool position of the first switching valve 31 is switched by powering on the first switching valve 31 to interrupt the oil supply to the first pilot oil port, the first pilot oil port is unloaded, the O-type reversing valve 2 automatically returns to the neutral position, and the swing driving mechanism 1 stops swinging in the first direction. At this time, the second switching valve 32 may control the pilot oil to enter the second pilot oil port so that the spool of the O-type switching valve 2 reaches the second operating position, and thereby control the swing drive mechanism 1 to swing in the second direction to within the preset angle range.
When the swing driving mechanism 1 swings in the second direction, if the swing angle of the working device is detected to exceed the preset swing angle in the second direction, the spool position of the second switching valve 32 is switched by powering on the second switching valve 32 to interrupt the oil supply to the second pilot oil port, the second pilot oil port is unloaded, the O-type reversing valve 2 automatically returns to the neutral position, and the swing driving mechanism 1 stops swinging in the second direction. At this time, the first switching valve 31 may control the pilot oil to enter the first pilot oil port so that the spool of the O-type switching valve 2 reaches the first operating position, and thereby control the swing drive mechanism 1 to swing in the first direction to within the preset angle range.
When the O-type reversing valve 2 is in the first operating position, the opening of the valve element of the O-type reversing valve 2 in the first operating position is adjusted to adjust the rotation angle of the rotation device in the first direction. When the O-type reversing valve 2 is in the second operating position, the opening degree of the valve element of the O-type reversing valve 2 in the second operating position is adjusted to adjust the angle at which the slewing device swings in the second direction.
The rotation limiting hydraulic system provided by the invention further comprises an operating handle. The oil inlet of the first switching valve 31 and the oil inlet of the second switching valve 32 are connected to the operating handle, respectively. Specifically, the operating handle has a first operating section and a second operating section. When both the first switching valve 31 and the second switching valve 32 are in the power-off state, the flow direction of the pilot oil is switched by operating the handle. When the operating handle is positioned in the first operating interval, the first switching valve 31 is used for feeding oil, so that the valve core of the O-shaped function reversing valve 2 reaches a first working position; when the operating handle is located in the second operating section, the second switching valve 32 is charged with oil, so that the spool of the O-type function switching valve 2 reaches the second working position.
When the rotation angle of the rotation device in the first direction exceeds the preset rotation angle in the first direction, the first switching valve 31 is electrified to unload the first pilot oil port. At the moment, the operation handle can be manually adjusted to a second operation interval, and the turning device is controlled to turn to the second direction to a set angle interval. When the rotation angle of the rotation device in the second direction exceeds the preset rotation angle in the second direction, the second switching valve 32 is electrified, so that the second pilot oil port is unloaded. At this time, the operation handle can be manually adjusted to the first operation section, and the turning device is controlled to turn in the first direction to the set angle section.
When the operating handle is located in the first operating section and the first switching valve 31 is in the power-off state, or the operating handle is located in the second operating section and the second switching valve 32 is in the power-off state, the opening of the corresponding switching valve can be adjusted by adjusting the opening of the operating handle, that is, the magnitude of the pilot pressure is adjusted, so as to adjust the opening of the valve core of the O-type functional reversing valve 2 on the corresponding working position, thereby adjusting the rotation angle of the rotation device.
Further, in the embodiment of the present invention, the O-type functional reversing valve 2 further includes a first unloading port C and a second unloading port D that are mutually communicated. The O-shaped function reversing valve 2 is in a neutral state, the first unloading port C is communicated with the hydraulic oil source 4, and the second unloading port D is communicated with the oil tank 5. The O-type reversing valve 2 is in a first working position state or a second working position state, and the first unloading port C and the second unloading port D are in a closed state.
When the O-shaped functional reversing valve 2 is in any working position, if any switching valve is powered on, the valve core of the O-shaped functional reversing valve 2 returns to the middle position from the working position, at the moment, the hydraulic oil source 4 is communicated with the oil tank 5 through the first unloading port C and the second unloading port D, and the hydraulic pump 6 can unload through the first unloading port C and the second unloading port D.
Further, the rotation limiting hydraulic system provided by the embodiment of the invention further comprises a first check valve 71 and a second check valve 72. The first check valve 71 is installed on a communication pipeline between the first working oil port 11 of the rotary driving mechanism and the oil tank 5, the second check valve 72 is installed on a communication pipeline between the second working oil port 12 of the rotary driving mechanism and the oil tank 5, and both the inlet of the first check valve 71 and the inlet of the second check valve 72 are communicated with the outlet of the oil tank 5.
When the spool of the O-type reversing valve 2 returns from the operating position to the neutral position, the hydraulic oil in the swing drive mechanism 1 has an instantaneous suction phenomenon. By providing the first check valve 71 and the second check valve 72, when the O-type reversing valve 2 is switched from the first operating position to the neutral position and from the second operating position to the neutral position, the oil can be timely replenished from the oil tank 5 into the swing drive mechanism 1, thereby preventing damage to the swing drive mechanism 1 such as the swing motor.
Furthermore, the rotation limiting hydraulic system provided by the embodiment of the invention further comprises an overflow valve 8, and the overflow valve 8 is arranged between the oil inlet P of the O-shaped function reversing valve 2 and the oil tank 5. By arranging the overflow valve 8, the overload of the hydraulic system can be prevented when the O-shaped function reversing valve 2 is in the first working position and the second working position, and the hydraulic components can be protected. Further, a pressure sensor 9 is arranged on a communicating pipeline between the oil inlet P and the hydraulic oil source. The pressure sensor 9 is used for monitoring the liquid-oil pressure on the oil inlet line of the O-ring function switching valve 2.
The invention also provides a control method of the rotation limiting hydraulic system in any embodiment. Fig. 2 is a schematic flow chart of a control method of the rotation limiting hydraulic system provided by the invention. The control method of the rotation limiting hydraulic system comprises the following steps:
s100, acquiring the rotation angle of the rotation device detected by the rotation angle detector;
and S200, controlling the valve core switching assembly 3 to switch the O-shaped function reversing valve 2 from the current working position to the middle position according to the rotation angle and the preset rotation angle range.
In particular, the angle detector may be an angle encoder mounted on the slewing device for detecting the angle deflected by the slewing device relative to a reference zero degree. The rotation angle range is preset according to the actual working condition. In the process of the rotation operation of the rotation device, when the angle detector detects that the rotation angle of the rotation device exceeds the preset rotation angle range, the valve core switching assembly 3 is used for switching the O-shaped function reversing valve 2 from the current working position to the middle position, so that the rotation of the rotation device in the current rotation direction is prevented from continuously rotating, the rotation angle of the rotation device is limited within the preset rotation angle range, the rotation range allowed by the actual working condition is prevented from being exceeded, and the operation safety is ensured.
Specifically, the turning angle includes a first direction turning angle and a second direction turning angle. The preset rotation angle range is an angle range between the first direction preset rotation angle and the second direction preset rotation angle, and the first switching valve 31 and the second switching valve 32 are in a normally-off state.
In step S200, according to the rotation angle and the preset rotation angle range, the spool switching assembly 3 switches the O-type reversing valve 2 from the current working position to the neutral position, and specifically includes:
s210, if the first direction rotation angle exceeds the first direction preset rotation angle, controlling the first switching valve 31 to be powered on;
and S220, if the second direction rotation angle exceeds the second direction preset rotation angle, controlling the second switching valve 32 to be electrified.
The rotation angle of the first direction exceeds the preset rotation angle of the first direction, that is, when the current O-type reversing valve 2 works in the first working position, the rotation angle of the rotating device in the first direction exceeds the preset rotation angle of the first direction. At this time, the first switching valve 31 is controlled to be electrified, so that the first pilot oil port of the O-shaped functional reversing valve 2 is unloaded, the O-shaped functional reversing valve 2 automatically returns to the middle position, and the slewing device is prevented from continuously slewing in the first direction.
The rotation angle in the second direction exceeds the preset rotation angle in the second direction, that is, when the current O-type reversing valve 2 works in the second working position, the rotation angle of the rotation device in the second direction exceeds the preset rotation angle in the second direction. At this time, the second switching valve 32 is controlled to be electrified, so that the second pilot oil port of the O-shaped functional reversing valve 2 is unloaded, the O-shaped functional reversing valve 2 automatically returns to the middle position, and the slewing device is prevented from continuously slewing in the second direction.
The invention also provides a working machine, which comprises a slewing device and the slewing limit hydraulic system in any embodiment. The driving end of the rotary driving mechanism 1 is in driving connection with a rotary device. The working machine may be a crane, an excavator, a concrete pump truck, a dump truck, or the like, and any working machine including a turning device is within the scope of the present invention. Further, the work machine includes an upper carriage and a lower carriage. The rotary driving mechanism 1 is arranged on the lower vehicle, and the rotary device is the upper vehicle. Namely, the driving end of the rotary driving mechanism 1 is connected with the upper vehicle driving. The rotation limiting hydraulic system provided by the invention can limit the rotation angle of the boarding car, prevent the rotation angle of the boarding car from exceeding a set rotation angle interval and ensure the operation safety of the crane.
Taking a crane as an example, the crane is used as the turning device in the embodiment of the invention. The direction of the upper vehicle turning to the left is a first direction, and the direction of the upper vehicle turning to the right is a second direction. The turning section may be set between a maximum angle at which the upper vehicle turns left and a maximum angle at which the upper vehicle turns right.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The rotary limiting hydraulic system is characterized by comprising a hydraulic pump, a rotary driving mechanism, an O-shaped function reversing valve, a valve core switching assembly, an oil tank and a rotary angle detector; the valve core switching assembly is in communication connection with the rotation angle detector, and the rotation angle detector is used for detecting the rotation angle of a rotation device driven by the rotation driving mechanism;
the rotary driving mechanism is connected with the O-shaped function reversing valve; the O-shaped functional reversing valve is provided with a first working position, a middle position and a second working position, and comprises an oil inlet, an oil return port, a first reversing port and a second reversing port, wherein the outlet of the hydraulic pump is communicated with the oil inlet, the oil return port is communicated with the oil tank, the first reversing port is communicated with a first working oil port of the rotary driving mechanism, and the second reversing port is communicated with a second working oil port of the rotary driving mechanism;
when the O-shaped function reversing valve is in the middle position, the oil inlet, the oil return port, the first reversing port and the second reversing port are all closed, so that the rotation driving mechanism stops rotating;
when the O-shaped function reversing valve is in the first working position, the oil inlet is communicated with the first reversing port, and the oil return port is communicated with the second reversing port;
when the O-shaped function reversing valve is in the second working position, the oil inlet is communicated with the second reversing port, and the oil return port is communicated with the first reversing port;
and under the condition that the rotation angle exceeds a preset rotation angle range, the valve core switching assembly can switch the O-shaped function reversing valve from the current working position to the middle position.
2. The swing limit hydraulic system of claim 1, wherein the spool switching assembly includes a first switching valve and a second switching valve, the O-ring pilot valve including a first pilot port corresponding to the first operating position and a second pilot port corresponding to the second operating position; the first switching valve is connected with the first pilot oil port, the second switching valve is connected with the second pilot oil port, and the first switching valve and the second switching valve are respectively connected with the rotation angle detector in a communication manner;
in the power-off state of the first switching valve, the first pilot oil port is communicated with an oil inlet of the first switching valve; in the power-on state of the first switching valve, the first pilot oil port is communicated with an oil tank through the first switching valve; the second pilot oil port is communicated with an oil inlet of the second switching valve in the power-off state of the second switching valve; and in the power-on state of the second switching valve, the second pilot oil port is communicated with the oil tank through the second switching valve.
3. The control method of a swing limit hydraulic system according to claim 2, further comprising an operation handle, wherein the oil inlet of the first switching valve and the oil inlet of the second switching valve are connected to the operation handle, respectively.
4. The swing limiting hydraulic system of claim 1, wherein the O-ring directional valve further comprises a first unloading port and a second unloading port in communication with each other, the O-ring directional valve being in a neutral state, the first unloading port being in communication with a hydraulic fluid source, the second unloading port being in communication with a tank, the O-ring directional valve being in a first operating position state or a second operating position state, the first unloading port and the second unloading port being in a closed state.
5. The swing limiting hydraulic system of claim 1, further comprising a first check valve and a second check valve, wherein the first check valve is mounted on a communication line between a first working port of the swing drive mechanism and the oil tank, the second check valve is mounted on a communication line between a second working port of the swing drive mechanism and the oil tank, and an inlet of the first check valve and an inlet of the second check valve are both communicated with an outlet of the oil tank.
6. The swing limit hydraulic system of claim 1, further comprising an overflow valve disposed on a connection line between an oil inlet of the O-ring directional valve and an oil tank.
7. A control method of the swing limit hydraulic system according to any one of claims 1 to 6, comprising:
acquiring the rotation angle of the rotation device detected by the rotation angle detector;
and controlling the valve core switching assembly to switch the O-shaped function reversing valve from the current working position to the middle position according to the rotation angle and the preset rotation angle range.
8. The control method of a swing limit hydraulic system according to claim 7, wherein the swing angle includes a first direction swing angle and a second direction swing angle, the preset swing angle range is an angle range between the first direction preset swing angle and the second direction preset swing angle, and the first switching valve and the second switching valve are in a normally-off state;
according to the rotation angle and the preset rotation angle range, the valve core switching assembly is controlled to switch the O-shaped function reversing valve from the current working position to the middle position, and the method comprises the following steps:
if the first direction rotation angle exceeds the first direction preset rotation angle, controlling the first switching valve to be electrified;
and if the second direction rotation angle exceeds the second direction preset rotation angle, controlling the second switching valve to be electrified.
9. A working machine comprising a slewing device and a slewing limit hydraulic system according to any one of claims 1 to 6, wherein the drive end of the slewing drive mechanism is in driving connection with the slewing device.
10. The work machine of claim 9, comprising an upper carriage and a lower carriage, wherein said swing drive mechanism is mounted to said lower carriage, and wherein said swing device is said upper carriage.
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| JP3142640B2 (en) * | 1992-06-19 | 2001-03-07 | 日立建機株式会社 | Hydraulic working machine hydraulic circuit |
| JPH08333778A (en) * | 1995-06-09 | 1996-12-17 | Yutani Heavy Ind Ltd | Turning circuit for construction machine |
| US8752373B2 (en) * | 2011-05-02 | 2014-06-17 | Kobelco Construction Machinery Co., Ltd. | Slewing type working machine |
| 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 |
| CN212130937U (en) * | 2020-05-14 | 2020-12-11 | 安徽柳工起重机有限公司 | Crane rotation buffering reversing valve and crane open type rotation braking control system |
| CN112922071B (en) * | 2021-01-28 | 2022-09-09 | 三一重机有限公司 | Rotation mechanism limiting system and operation machine |
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