CN210799541U - Hydraulic system and engineering machinery - Google Patents
Hydraulic system and engineering machinery Download PDFInfo
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- CN210799541U CN210799541U CN201921948347.3U CN201921948347U CN210799541U CN 210799541 U CN210799541 U CN 210799541U CN 201921948347 U CN201921948347 U CN 201921948347U CN 210799541 U CN210799541 U CN 210799541U
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Abstract
The utility model provides a hydraulic system and engineering machinery, which relates to the hydraulic technical field, wherein the hydraulic system comprises a rotary pilot oil circuit, a lifting pilot oil circuit and a control mechanism; the control mechanism comprises a controller, a rotary pressure sensor, a lifting pressure sensor and a pressure regulating assembly; the rotary pressure sensor is arranged on the rotary pilot oil way and used for detecting a pilot pressure signal of the rotary pilot oil way and sending the pilot pressure signal to the controller; the lifting pressure sensor is arranged on the lifting pilot oil way and used for detecting a pilot pressure signal of the lifting pilot oil way and sending the pilot pressure signal to the controller; the pressure regulating assembly is arranged on the lifting pilot oil way and/or the rotary pilot oil way; the pressure regulating assembly is connected with the controller, and when the rotary pressure sensor and the lifting pressure sensor detect pilot pressure signals simultaneously, the controller controls the pressure regulating assembly to regulate the pressure of a pilot oil way communicated with the pressure regulating assembly. The difference value between the rotation speed of the rotation motor and the lifting speed of the movable arm can be adjusted to meet various working condition requirements.
Description
Technical Field
The utility model belongs to the technical field of the hydraulic pressure technique and specifically relates to a hydraulic system is related to and an engineering machine tool.
Background
An excavator is an earth moving machine that excavates material above or below a bearing surface with a bucket and loads it into a transport vehicle or unloads it to a stockyard.
In the excavator, a combined action of boom lifting and swing is often used in the working process, and in the combined action, the flow of a hydraulic system tends to be in a swing motor with a light load, so that the swing speed of the swing motor is greater than the lifting speed of the boom.
In the construction process, different working conditions have different requirements on the difference value between the rotation speed of the rotation motor and the lifting speed of the movable arm. However, the excavator in the prior art cannot adjust the difference between the rotation speed of the rotation motor and the lifting speed of the movable arm, and is difficult to adapt to various working conditions.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hydraulic system to solve the technical problem that hydraulic system among the prior art is difficult to adapt to multiple operating mode.
The utility model provides a hydraulic system, which comprises a rotary pilot oil path, a lifting pilot oil path and a control mechanism;
the control mechanism comprises a controller, a rotary pressure sensor, a lifting pressure sensor and a pressure regulating assembly;
the rotary pressure sensor is arranged on the rotary pilot oil way and used for detecting a pilot pressure signal of the rotary pilot oil way and sending the pilot pressure signal to the controller;
the lifting pressure sensor is arranged on the lifting pilot oil way and used for detecting a pilot pressure signal of the lifting pilot oil way and sending the pilot pressure signal to the controller;
the pressure regulating assembly is arranged on the lifting pilot oil way and/or the rotary pilot oil way; the pressure regulating assembly is connected with the controller, and when the rotary pressure sensor and the lifting pressure sensor detect pilot pressure signals simultaneously, the controller controls the pressure regulating assembly to regulate the pressure of a pilot oil way communicated with the pressure regulating assembly.
Further, the hydraulic system also comprises a rotary reversing valve and a rotary pilot valve;
the rotary reversing valve comprises a first reversing oil port and a second reversing oil port;
the rotary pilot oil path comprises a first rotary pilot oil path and a second rotary pilot oil path, the first reversing oil port is connected with the rotary pilot valve through the first rotary pilot oil path, and the second reversing oil port is connected with the rotary pilot valve through the second rotary pilot oil path;
the first rotary pilot oil path and the second rotary pilot oil path are respectively provided with the rotary pressure sensor; and the pressure regulating assembly is respectively communicated with the first rotary pilot oil way and the second rotary pilot oil way.
Further, the pressure regulating assembly comprises a shuttle valve and an overflow valve;
two inlets of the shuttle valve are respectively communicated with the first rotary pilot oil path and the second rotary pilot oil path, and an outlet of the shuttle valve is communicated with the overflow valve;
the overflow valve is connected with the controller, and when the rotation pressure sensor and the lifting pressure sensor simultaneously detect pilot pressure signals, the controller controls the overflow valve to reduce overflow pressure.
Further, the hydraulic system also comprises a lifting reversing valve and a lifting pilot valve;
the lifting reversing valve comprises a third reversing oil port; the lifting pilot valve is connected with the third reversing oil port through the lifting pilot oil way.
Further, the lifting reversing valve further comprises a fourth reversing oil port; the lifting pilot valve is connected with the fourth reversing oil port through a descending pilot oil way;
the control mechanism further comprises a descent pressure sensor; the descending pressure sensor is arranged on the descending pilot oil circuit and used for detecting a pilot pressure signal of the descending pilot oil circuit and sending the pilot pressure signal to the controller.
Further, the hydraulic system also comprises a lifting reversing valve and a lifting pilot valve;
the lifting reversing valve comprises a third reversing oil port; the lifting pilot valve is connected with the third reversing oil port through the lifting pilot oil way; and the pressure regulating assembly is communicated with the lifting pilot oil way.
Further, the lifting reversing valve further comprises a fourth reversing oil port;
the lifting pilot valve is connected with the fourth reversing oil port through a descending pilot oil way;
the control mechanism further comprises a descent pressure sensor; the descending pressure sensor is arranged on the descending pilot oil circuit and used for detecting a pilot pressure signal of the descending pilot oil circuit and sending the pilot pressure signal to the controller;
the pressure regulating assembly is respectively communicated with the lifting pilot oil way and the descending pilot oil way.
Further, the pressure regulating assembly comprises a shuttle valve and an overflow valve;
two inlets of the shuttle valve are respectively communicated with the lifting pilot oil way and the descending pilot oil way, and an outlet of the shuttle valve is communicated with the overflow valve;
the overflow valve is connected with the controller, and when the rotation pressure sensor and the lifting pressure sensor simultaneously detect pilot pressure signals, the controller controls the overflow pressure of the overflow valve to be reduced.
Further, the hydraulic system also comprises a rotary reversing valve and a rotary pilot valve;
the rotary reversing valve comprises a first reversing oil port and a second reversing oil port;
the rotary pilot oil path comprises a first rotary pilot oil path and a second rotary pilot oil path, the first reversing oil port is connected with the rotary pilot valve through the first rotary pilot oil path, and the second reversing oil port is connected with the rotary pilot valve through the second rotary pilot oil path;
the first rotary pilot oil path and the second rotary pilot oil path are respectively provided with the rotary pressure sensor.
An object of the utility model is to provide an engineering machine tool still, include the utility model provides an engineering machine tool.
When the hydraulic system drives the movable arm to lift and rotate simultaneously, the hydraulic oil pushes the rotary reversing valve to move through the rotary pilot oil way, so that the hydraulic oil is supplied to the rotary motor to drive the movable arm to rotate; the hydraulic oil pushes the lifting reversing valve to act through the lifting pilot oil path, so that the hydraulic oil is supplied to the movable arm oil cylinder to drive the movable arm to lift. Under the condition that the pressure regulating assembly is arranged on the rotary pilot oil way, when a hydraulic system drives a movable arm to lift and rotate simultaneously, hydraulic oil flows into the rotary pilot oil way and the lifting hydraulic oil way at the same time, the rotary pressure sensor and the lifting pressure sensor can detect pilot pressure signals simultaneously, the controller controls the pressure regulating assembly to reduce the pressure of the rotary pilot oil way, so that the pressure of the rotary pilot oil way is reduced to a proper value, the stroke of a valve core of the rotary reversing valve cannot reach the maximum, the flow of the hydraulic oil entering a rotary motor through the rotary reversing valve is limited, the speed of the rotary motor is further limited, the purpose of regulating the priority of the lifting action of the movable arm relative to the rotary action is realized, and the priority degree of the lifting action of the movable arm relative to the rotary action can; under the condition that the pressure regulating assembly is arranged on the lifting pilot oil way, when a hydraulic system drives a movable arm to lift and rotate simultaneously, hydraulic oil flows into the rotating pilot oil way and the lifting hydraulic oil way in a uniform flow mode, the rotating pressure sensor and the lifting pressure sensor can detect pilot pressure signals simultaneously, at the moment, the controller controls the pressure regulating assembly to reduce the pressure of the lifting pilot oil way, so that the pressure of the lifting pilot oil way is reduced, the stroke of a valve core of a lifting reversing valve cannot reach the maximum, the flow of the hydraulic oil entering the movable arm oil cylinder through the lifting reversing valve is limited, the speed of the movable arm oil cylinder is further limited, the purpose that the rotation action is regulated to be preferential to the lifting action of the movable arm is achieved, and the priority degree of the rotation action to; the controller controls the pressure regulating assembly to reduce the pressure of the lifting pilot oil way and keep the pressure of the rotary pilot oil way unchanged when the rotary pressure sensor and the lifting pressure sensor simultaneously detect pilot pressure signals when the pressure regulating assembly is arranged on the rotary pilot oil way and the lifting pilot oil way and the aim of regulating the rotary action to be prior to the lifting action of the movable arm is needed to be fulfilled; when the aim of adjusting the priority of the boom lifting action relative to the swing action is needed to be fulfilled, and the swing pressure sensor and the lifting pressure sensor simultaneously detect pilot pressure signals, the controller controls the pressure adjusting assembly to reduce the pressure of the swing pilot oil path and keep the pressure of the lifting pilot oil path unchanged. To sum up, the utility model provides a hydraulic system can adjust the difference of slewing speed of rotary motor and the hoisting speed of swing arm to adapt to multiple operating mode demand.
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 embodiments or the technical solutions in 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a hydraulic system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a hydraulic system according to another embodiment of the present invention.
Icon: 1-lifting a pilot oil way; 2-a rotary pilot oil way; 21-a first swing pilot oil path; 22-a second swing pilot oil path; 3-a control mechanism; 31-a controller; 32-rotary pressure sensor; 33-a lift pressure sensor; 34-an overflow valve; 35-a shuttle valve; 36-a falling pressure sensor; 4-a rotary reversing valve; 5-a rotary pilot valve; 6-a lifting reversing valve; 7-a lifting pilot valve; 8-a rotary oil pump; 9-lifting oil pump; 10-descending pilot oil path; 11-a boom cylinder; 12-rotary motor.
Detailed Description
The technical solution of the present invention will be described in detail and initially with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a hydraulic system and engineering machine tool, it is right to give a plurality of embodiments below the utility model provides a hydraulic system and engineering machine tool carry out detailed description.
The hydraulic system provided by the present embodiment, as shown in fig. 1 to 2, includes a rotation pilot oil path 2, a lift pilot oil path 1, and a control mechanism 3; the control mechanism 3 comprises a controller 31, a rotary pressure sensor 32, a lifting pressure sensor 33 and a pressure regulating assembly; the rotary pressure sensor 32 is arranged on the rotary pilot oil path 2, and is used for detecting a pilot pressure signal of the rotary pilot oil path 2 and sending the pilot pressure signal to the controller 31; the lifting pressure sensor 33 is arranged on the lifting pilot oil path 1, and is used for detecting a pilot pressure signal of the lifting pilot oil path 1 and sending the pilot pressure signal to the controller 31; the pressure regulating assembly is arranged on the lifting pilot oil way 1 and/or the rotary pilot oil way 2; the pressure regulating assembly is connected with the controller 31, and when the rotation pressure sensor 32 and the lifting pressure sensor 33 simultaneously detect pilot pressure signals, the controller 31 controls the pressure regulating assembly to regulate the pressure of a pilot oil path communicated with the pressure regulating assembly.
When the hydraulic system drives the movable arm to lift and rotate simultaneously, hydraulic oil pushes the rotary reversing valve 4 to act through the rotary pilot oil path 2, so that the hydraulic oil is supplied to the rotary motor 12 to drive the movable arm to rotate; the hydraulic oil pushes the lifting reversing valve 6 to act through the lifting pilot oil path 1, so that the hydraulic oil is supplied to the boom cylinder 11 to drive the boom to lift.
Under the condition that the pressure regulating assembly is arranged on the rotary pilot oil way 2, when a hydraulic system drives a movable arm to lift and rotate simultaneously, hydraulic oil flows into the rotary pilot oil way 2 and the lifting hydraulic oil way uniformly, the rotary pressure sensor 32 and the lifting pressure sensor 33 can detect pilot pressure signals simultaneously, at the moment, the controller 31 controls the pressure regulating assembly to reduce the pressure of the rotary pilot oil way 2, so that the pressure of the rotary pilot oil way 2 is reduced, the valve core stroke of the rotary reversing valve 4 cannot reach the maximum, the flow of the hydraulic oil entering the rotary motor 12 through the rotary reversing valve 4 is limited, the speed of the rotary motor 12 is further limited, and the purpose that the movable arm lifting is prior to the rotary action is achieved. And the priority degree of the boom lifting action relative to the rotation action can be controlled through the pressure regulating assembly, and the pressure regulating assembly can reduce the pressure of the rotation pilot oil circuit 2 to a proper degree according to the requirement of the priority degree.
Under the condition that the pressure regulating assembly is arranged on the lifting pilot oil way 1, when a hydraulic system drives a movable arm to lift and rotate simultaneously, hydraulic oil flows into the rotating pilot oil way 2 and the lifting hydraulic oil way uniformly, the rotating pressure sensor 32 and the lifting pressure sensor 33 can detect pilot pressure signals simultaneously, at the moment, the controller 31 controls the pressure regulating assembly to reduce the pressure of the lifting pilot oil way 1, so that the pressure of the lifting pilot oil way 1 is reduced, the stroke of a valve core of a lifting reversing valve cannot reach the maximum, the flow of the hydraulic oil entering the movable arm oil cylinder 11 through the lifting reversing valve is limited, the speed of the movable arm oil cylinder 11 is limited, and the purpose that the rotation of the movable arm is prior to the lifting action is. And the priority degree of the rotation action relative to the lifting action of the movable arm can be controlled through the pressure regulating assembly, and the pressure regulating assembly can reduce the pressure of the lifting pilot oil circuit 1 to a proper degree according to the requirement of the priority degree.
When the pressure regulating assembly is arranged on the rotary pilot oil path 2 and the lifting pilot oil path 1 and the aim of regulating the rotary action to be prior to the lifting action of the movable arm needs to be fulfilled, and the rotary pressure sensor 32 and the lifting pressure sensor 33 simultaneously detect pilot pressure signals, the controller controls the pressure regulating assembly to reduce the pressure of the lifting pilot oil path 1 and keep the pressure of the rotary pilot oil path 2 unchanged; when it is necessary to achieve the purpose of prioritizing the boom raising operation over the swing operation, the controller controls the pressure adjusting unit to reduce the pressure of the swing pilot oil passage 2 and keep the pressure of the lift pilot oil passage 1 constant when the swing pressure sensor 32 and the lift pressure sensor 33 simultaneously detect pilot pressure signals.
The hydraulic system provided by the embodiment can realize that the swing of the movable arm is prior to the lifting action or the lifting of the movable arm is prior to the swing action, so that the difference value between the swing speed of the swing motor and the lifting speed of the movable arm is adjusted to adapt to various working condition requirements.
In addition, compared with the hydraulic system in the prior art, the hydraulic system provided by the embodiment only needs to be additionally provided with the control mechanism 3, and the cost and the structural complexity are lower.
As an embodiment, when the pressure regulating assembly is communicated with the rotary pilot oil path 2, as shown in fig. 1, the hydraulic system further includes a rotary reversing valve 4 and a rotary pilot valve 5; the rotary reversing valve 4 comprises a first reversing oil port and a second reversing oil port; the rotary pilot oil path 2 comprises a first rotary pilot oil path 21 and a second rotary pilot oil path 22, a first reversing oil port is connected with the rotary pilot valve 5 through the first rotary pilot oil path 21, and a second reversing oil port is connected with the rotary pilot valve 5 through the second rotary pilot oil path 22; a rotation pressure sensor 32 is provided on each of the first rotation pilot oil passage 21 and the second rotation pilot oil passage 22; the pressure regulating assembly communicates with the first and second swing pilot oil passages 21 and 22, respectively.
Specifically, the hydraulic system further comprises a rotary oil pump 8, and the rotary oil pump 8 is connected with an oil inlet of the rotary reversing valve 4 so as to supply oil to the rotary motor 12 through the rotary reversing valve 4, so as to drive the movable arm to rotate. After the first rotary pilot oil path 21 is supplied with oil, the rotary reversing valve 4 is pushed to reverse to a first position, and the rotary motor 12 can rotate towards a first direction; after the second swing pilot oil passage 22 is supplied with oil, the swing selector valve 4 is pushed to switch to the second position, at which time the swing motor 12 can swing in the second direction, and the first direction is opposite to the second direction.
When the boom is driven to lift and rotate towards the first direction simultaneously, hydraulic oil flows into both the first rotation pilot oil path 21 and the lifting hydraulic oil path, the rotation pressure sensor 32 and the lifting pressure sensor 33 on the first rotation pilot oil path 21 can detect pilot pressure signals simultaneously, at this time, the controller 31 controls the pressure regulating assembly to reduce the pressure of the first rotation pilot oil path 21, the valve core stroke of the rotation reversing valve 4 cannot reach the maximum, so that the flow of the hydraulic oil entering the rotation motor 12 through the rotation reversing valve 4 is limited, the speed of the rotation motor 12 is further limited, and the purpose that the boom lifting is preferred to the rotation action towards the first direction is achieved.
When the boom is driven to lift and rotate towards the second direction simultaneously, hydraulic oil flows into both the second rotation pilot oil path 22 and the lifting hydraulic oil path, the rotation pressure sensor 32 and the lifting pressure sensor 33 on the second rotation pilot oil path 22 can detect pilot pressure signals simultaneously, at this time, the controller 31 controls the pressure regulating assembly to reduce the pressure of the second rotation pilot oil path 22, the valve core stroke of the rotation reversing valve 4 cannot reach the maximum, so that the flow of the hydraulic oil entering the rotation motor 12 through the rotation reversing valve 4 is limited, the speed of the rotation motor 12 is further limited, and the purpose that the boom lifting is preferred to the rotation action towards the second direction is achieved.
When the controller 31 receives pilot pressure signals detected by the rotation pressure sensor 32 and the lift pressure sensor 33 at the same time, the controller performs calculation according to the pilot pressure signals detected by the rotation pressure sensor 32 and the lift pressure sensor 33, and adjusts the pressure of the rotation pilot oil path 2 according to the calculation result, so that the pilot pressure of the rotation pilot oil path 2 is reduced, the spool of the rotation directional valve 4 cannot reach the maximum stroke, the flow rate of hydraulic oil in the rotation motor 12 is low, the rotation speed is low, the pilot pressure of the lift pilot oil path 1 is not reduced, the spool of the lift directional valve can reach the maximum stroke, the flow rate of hydraulic oil in the boom cylinder 11 is high, the boom is lifted fast, and the purpose that the lifting action is prior to the boom rotation is achieved. The control mechanism 3 has a simple structure and is easy to implement, and the priority of the boom raising operation with respect to the swing operation can be accurately controlled by the program of the controller 31, so that the accuracy is high.
Further, the pressure regulating assembly includes a shuttle valve 35 and an overflow valve 34; two inlets of the shuttle valve 35 are respectively communicated with the first rotary pilot oil path 21 and the second rotary pilot oil path 22, and an outlet of the shuttle valve 35 is communicated with the overflow valve 34; the relief valve 34 is connected to the controller 31, and when the swing pressure sensor 32 and the lift pressure sensor 33 simultaneously detect pilot pressure signals, the controller 31 controls the relief valve 34 to reduce the relief pressure.
When the pilot oil flows into the first rotary pilot oil passage 21, the first rotary pilot oil passage 21 communicates with the relief valve 34 via the shuttle valve 35, and the relief valve 34 can adjust the pressure in the first rotary pilot oil passage 21; when the pilot oil flows into the second swing pilot oil passage 22, the second swing pilot oil passage 22 communicates with the relief valve 34 via the shuttle valve 35, and the pressure in the second swing pilot oil passage 22 can be adjusted by the relief valve 34.
In addition, the pressure regulating assembly can also comprise a first overflow valve and a second overflow valve; the first overflow valve is connected with the first rotary pilot oil path 21, and the second overflow valve is connected with the second rotary pilot oil path 22; the first relief valve and the second relief valve are respectively connected with the controller 31, and when the turning pressure sensor 32 and the lifting pressure sensor 33 on the first turning pilot oil path 21 simultaneously detect pilot pressure signals, the controller 31 controls the relief pressure of the first relief valve to be reduced; when the pilot pressure signals are detected by the swing pressure sensor 32 and the lift pressure sensor 33 on the second swing pilot oil passage 22 at the same time, the controller 31 controls the relief pressure of the second relief valve to decrease.
When the boom is simultaneously driven to lift and rotate towards the first direction, hydraulic oil flows into both the first rotation pilot oil path 21 and the lifting hydraulic oil path, the rotation pressure sensor 32 and the lifting pressure sensor 33 on the first rotation pilot oil path 21 can simultaneously detect pilot pressure signals, and at this time, the controller 31 controls the first relief valve to reduce the relief pressure, so that the pressure of the first rotation pilot oil path 21 is reduced.
When the boom is simultaneously driven to lift and rotate towards the second direction, hydraulic oil flows into both the second rotation pilot oil path 22 and the lifting hydraulic oil path, the rotation pressure sensor 32 and the lifting pressure sensor 33 on the second rotation pilot oil path 22 can simultaneously detect pilot pressure signals, and at this time, the controller 31 reduces the overflow pressure of the second overflow valve, so that the pressure of the second rotation pilot oil path 22 is reduced.
Further, the hydraulic system also comprises a lifting reversing valve 6 and a lifting pilot valve 7; the lifting reversing valve 6 comprises a third reversing oil port; the lifting pilot valve 7 is connected with the third reversing oil port through the lifting pilot oil path 1.
When an operator operates the boom lifting and slewing motions simultaneously, the pilot oil from the lift pilot valve 7 pushes the lift directional valve 6 to operate, the lift oil pump 9 supplies hydraulic oil to the boom cylinder 11 through the lift directional valve 6 to lift the boom, the pilot oil from the slewing pilot valve 5 pushes the slewing directional valve 4 to operate, the slewing oil pump 8 supplies hydraulic oil to the slewing motor 12 to slew the slewing motor 12, at the same time, the lift pressure sensor 33 obtains a pilot pressure signal of boom lift and transmits the signal to the controller 31, the rotary pressure sensor 32 on the first rotary pilot oil path 21 or the second rotary pilot oil path 22 obtains a rotary pilot pressure signal and transmits the signal to the controller 31, when the swing pressure sensor 32 and the lift pressure sensor 33 can simultaneously detect the pilot pressure signal, the controller 31 outputs an electric signal to the relief valve 34, and the relief pressure of the relief valve 34 is lowered.
Further, the lifting reversing valve 6 further comprises a fourth reversing oil port; the lifting pilot valve 7 is connected with the fourth reversing oil port through a descending pilot oil path 10; the control mechanism 3 further includes a falling pressure sensor 36; a drop pressure sensor 36 is provided in the drop pilot oil passage 10, and detects a pilot pressure signal of the drop pilot oil passage 10 and sends the signal to the controller 31.
When the pilot oil flows into the descending pilot oil path 10, the pilot oil pushes the lifting reversing valve 6 to move through the fourth reversing oil port, and the hydraulic oil in the boom cylinder 11 can flow back to the oil tank through the lifting reversing valve 6, so that the boom can descend.
When the boom is lowered, the lowering pressure sensor 36 can detect a pilot pressure signal of the lowering pilot oil passage 10 and send the pilot pressure signal to the controller 31 so that the controller 31 can acquire a boom lowering operation state.
As another embodiment, when the pressure regulating assembly is communicated with the lifting pilot oil path 1, as shown in fig. 2, the hydraulic system further includes a lifting reversing valve 6 and a lifting pilot valve 7; the lifting reversing valve 6 comprises a third reversing oil port; the lifting pilot valve 7 is connected with the third reversing oil port through the lifting pilot oil way 1; and the pressure regulating assembly is communicated with the lifting pilot oil way 1.
Specifically, the hydraulic system further comprises a lifting oil pump 9, and the lifting oil pump 9 is connected with an oil inlet of the lifting reversing valve 6 so as to supply oil to the boom oil cylinder 11 through the lifting reversing valve 6, so as to drive the boom to lift.
When the boom lifting and rotating actions are driven simultaneously, hydraulic oil flows into the rotating pilot oil way 2 and the lifting hydraulic oil way at the same time, the rotating pressure sensor 32 and the lifting pressure sensor 33 on the rotating pilot oil way 2 can detect pilot pressure signals at the same time, the controller 31 controls the pressure regulating assembly to reduce the pressure of the lifting pilot oil way 1, and the valve core stroke of the lifting reversing valve 6 cannot reach the maximum, so that the flow of the hydraulic oil entering the boom oil cylinder 11 through the lifting reversing valve 6 is limited, the boom lifting speed is limited, and the purpose that the rotating action is prior to the boom lifting rotating action is achieved.
When the controller 31 receives pilot pressure signals detected by the rotation pressure sensor 32 and the lift pressure sensor 33 at the same time, the controller performs calculation according to the pilot pressure signals detected by the rotation pressure sensor 32 and the lift pressure sensor 33, and adjusts the pilot pressure of the lift pilot oil path 1 according to the calculation result, so that the pilot pressure of the lift pilot oil path 1 is reduced, the spool of the lift directional valve 6 cannot reach the maximum stroke, the flow of hydraulic oil in the boom cylinder 11 is small, the lifting speed is slow, the pilot pressure of the rotation pilot oil path 2 is not reduced, the spool of the rotation directional valve 4 can reach the maximum stroke, the flow of hydraulic oil in the rotation motor 12 is large, the rotation of the boom is fast, and the purpose that the rotation action is prior to the boom lifting action is achieved. The control mechanism 3 has a simple structure and is easy to implement, and the priority of the boom raising operation with respect to the swing operation can be accurately controlled by the program of the controller 31, so that the accuracy is high.
Further, the lifting reversing valve 6 further comprises a fourth reversing oil port; the lifting pilot valve 7 is connected with the fourth reversing oil port through a descending pilot oil path 10; the control mechanism 3 further includes a falling pressure sensor 36; a descent pressure sensor 36 provided on the descent pilot oil passage 10, for detecting a pilot pressure signal of the descent pilot oil passage 10 and sending the signal to the controller 31; the pressure regulating assembly is respectively communicated with the lifting pilot oil path 1 and the descending pilot oil path 10.
When the pilot oil flows into the descending pilot oil path 10, the pilot oil pushes the lifting reversing valve 6 to move through the fourth reversing oil port, and the hydraulic oil in the boom cylinder 11 can flow back to the oil tank through the lifting reversing valve 6, so that the boom can descend. When the boom is lowered, the lowering pressure sensor 36 can detect a pilot pressure signal of the lowering pilot oil passage 10 and send the pilot pressure signal to the controller 31 so that the controller 31 can acquire a boom lowering operation state.
Further, the pressure regulating assembly includes a shuttle valve 35 and an overflow valve 34; two inlets of the shuttle valve 35 are respectively communicated with the lifting pilot oil path 1 and the descending pilot oil path 10, and an outlet of the shuttle valve 35 is communicated with the overflow valve 34; the relief valve 34 is connected to the controller 31, and when the swing pressure sensor 32 and the lift pressure sensor 33 simultaneously detect pilot pressure signals, the controller 31 controls the relief pressure of the relief valve 34 to be reduced.
When pilot oil flows into the lift pilot oil path 1, the lift pilot oil path 1 is communicated with an overflow valve 34 through a shuttle valve 35, and the overflow valve 34 can adjust the pressure in the lift pilot oil path 1; when the pilot oil flows into the descending pilot oil passage 10, the descending pilot oil passage 10 communicates with the relief valve 34 via the shuttle valve 35, and the pressure in the descending pilot oil passage 10 can be adjusted by the relief valve 34.
Further, the hydraulic system also comprises a rotary reversing valve 4 and a rotary pilot valve 5; the rotary reversing valve 4 comprises a first reversing oil port and a second reversing oil port; the rotary pilot oil path 2 comprises a first rotary pilot oil path 21 and a second rotary pilot oil path 22, a first reversing oil port is connected with the rotary pilot valve 5 through the first rotary pilot oil path 21, and a second reversing oil port is connected with the rotary pilot valve 5 through the second rotary pilot oil path 22; a turning pressure sensor 32 is provided in each of first turning pilot oil passage 21 and second turning pilot oil passage 22.
After the first rotary pilot oil path 21 is supplied with oil, the rotary reversing valve 4 is pushed to reverse to a first position, and the rotary motor 12 can rotate towards a first direction; after the second swing pilot oil passage 22 is supplied with oil, the swing selector valve 4 is pushed to switch to the second position, at which time the swing motor 12 can swing in the second direction, and the first direction is opposite to the second direction.
Compared with the hydraulic system in the prior art, the hydraulic system provided by the embodiment only needs to additionally provide the control mechanism 3, and the cost and the structural complexity are low.
The engineering machine provided by the embodiment comprises the hydraulic system provided by the embodiment. The engineering machinery can be an excavator, a crane and the like, and can be in any suitable form.
The engineering machine provided by the embodiment can realize that the swing of the movable arm is prior to the lifting action or the lifting of the movable arm is prior to the swing action, so that the difference value between the swing speed of the swing motor and the lifting speed of the movable arm is adjusted to adapt to various working condition requirements.
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; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A hydraulic system is characterized by comprising a rotary pilot oil way (2), a lifting pilot oil way (1) and a control mechanism (3);
the control mechanism (3) comprises a controller (31), a rotary pressure sensor (32), a lifting pressure sensor (33) and a pressure regulating assembly;
the rotary pressure sensor (32) is arranged on the rotary pilot oil path (2) and used for detecting a pilot pressure signal of the rotary pilot oil path (2) and sending the pilot pressure signal to the controller (31);
the lifting pressure sensor (33) is arranged on the lifting pilot oil path (1) and used for detecting a pilot pressure signal of the lifting pilot oil path (1) and sending the pilot pressure signal to the controller (31);
the pressure regulating assembly is arranged on the lifting pilot oil way (1) and/or the rotary pilot oil way (2); the pressure regulating subassembly with controller (31) are connected gyration pressure sensor (32) and promote pressure sensor (33) when detecting guide's pressure signal simultaneously, controller (31) control the pressure regulating subassembly adjust with the pressure of the guide's oil circuit that the pressure regulating subassembly is connected.
2. The hydraulic system according to claim 1, characterized in that it further comprises a swing reversing valve (4) and a swing pilot valve (5);
the rotary reversing valve (4) comprises a first reversing oil port and a second reversing oil port;
the rotary pilot oil path (2) comprises a first rotary pilot oil path (21) and a second rotary pilot oil path (22), the first reversing oil port is connected with the rotary pilot valve (5) through the first rotary pilot oil path (21), and the second reversing oil port is connected with the rotary pilot valve (5) through the second rotary pilot oil path (22);
the first rotary pilot oil path (21) and the second rotary pilot oil path (22) are respectively provided with the rotary pressure sensor (32); the pressure regulating assembly is respectively communicated with the first rotary pilot oil path (21) and the second rotary pilot oil path (22).
3. The hydraulic system of claim 2, wherein the pressure regulating assembly includes a shuttle valve (35) and an overflow valve (34);
two inlets of the shuttle valve (35) are respectively communicated with the first rotary pilot oil path (21) and the second rotary pilot oil path (22), and an outlet of the shuttle valve (35) is communicated with the overflow valve (34);
the overflow valve (34) is connected with the controller (31), and when the revolution pressure sensor (32) and the lifting pressure sensor (33) simultaneously detect pilot pressure signals, the controller (31) controls the overflow valve (34) to reduce overflow pressure.
4. The hydraulic system according to claim 2, characterized in that it further comprises a lifting reversing valve (6) and a lifting pilot valve (7);
the lifting reversing valve (6) comprises a third reversing oil port; the lifting pilot valve (7) is connected with the third reversing oil port through the lifting pilot oil way (1).
5. The hydraulic system according to claim 4, characterized in that the lift directional control valve (6) further comprises a fourth directional oil port; the lifting pilot valve (7) is connected with the fourth reversing oil port through a descending pilot oil way (10);
the control mechanism (3) further comprises a descent pressure sensor (36); the descending pressure sensor (36) is arranged on the descending pilot oil path (10) and used for detecting a pilot pressure signal of the descending pilot oil path (10) and sending the pilot pressure signal to the controller (31).
6. The hydraulic system according to claim 1, characterized in that it further comprises a lifting reversing valve (6) and a lifting pilot valve (7);
the lifting reversing valve (6) comprises a third reversing oil port; the lifting pilot valve (7) is connected with the third reversing oil port through the lifting pilot oil way (1); and the pressure regulating assembly is communicated with the lifting pilot oil way (1).
7. The hydraulic system according to claim 6, characterized in that the lift directional control valve (6) further comprises a fourth directional oil port;
the lifting pilot valve (7) is connected with the fourth reversing oil port through a descending pilot oil way (10);
the control mechanism (3) further comprises a descent pressure sensor (36); the descending pressure sensor (36) is arranged on the descending pilot oil path (10) and is used for detecting a pilot pressure signal of the descending pilot oil path (10) and sending the pilot pressure signal to the controller (31);
the pressure regulating assembly is respectively communicated with the lifting pilot oil way (1) and the descending pilot oil way (10).
8. The hydraulic system of claim 7, wherein the pressure regulating assembly includes a shuttle valve (35) and an overflow valve (34);
two inlets of the shuttle valve (35) are respectively communicated with the lifting pilot oil path (1) and the descending pilot oil path (10), and an outlet of the shuttle valve (35) is communicated with the overflow valve (34);
the overflow valve (34) is connected with the controller (31), and when the revolution pressure sensor (32) and the lifting pressure sensor (33) simultaneously detect pilot pressure signals, the controller (31) controls the overflow pressure of the overflow valve (34) to be reduced.
9. The hydraulic system according to claim 7, characterized in that it further comprises a swing reversing valve (4) and a swing pilot valve (5);
the rotary reversing valve (4) comprises a first reversing oil port and a second reversing oil port;
the rotary pilot oil path (2) comprises a first rotary pilot oil path (21) and a second rotary pilot oil path (22), the first reversing oil port is connected with the rotary pilot valve (5) through the first rotary pilot oil path (21), and the second reversing oil port is connected with the rotary pilot valve (5) through the second rotary pilot oil path (22);
the first and second swing pilot oil passages (21, 22) are provided with the swing pressure sensors (32), respectively.
10. A working machine, characterized in that it comprises a hydraulic system according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921948347.3U CN210799541U (en) | 2019-11-12 | 2019-11-12 | Hydraulic system and engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921948347.3U CN210799541U (en) | 2019-11-12 | 2019-11-12 | Hydraulic system and engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN210799541U true CN210799541U (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921948347.3U Active CN210799541U (en) | 2019-11-12 | 2019-11-12 | Hydraulic system and engineering machinery |
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| Country | Link |
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| CN (1) | CN210799541U (en) |
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