Hydraulic system and control method thereof

Abstract

The present invention provides a hydraulic system and a control method thereof, relating to the field of hydraulic technology. The hydraulic system includes a slewing pilot oil circuit, a lifting pilot oil circuit, and a control mechanism; the control mechanism includes a controller, a slewing pressure sensor, a lifting pressure sensor, and a pressure regulating assembly; the slewing pressure sensor is disposed in the slewing pilot oil circuit and is used to detect a pilot pressure signal from the slewing pilot oil circuit and transmit it to the controller; the lifting pressure sensor is disposed in the lifting pilot oil circuit and is used to detect a pilot pressure signal from the lifting pilot oil circuit and transmit it to the controller; the pressure regulating assembly is disposed in the lifting pilot oil circuit and / or the slewing pilot oil circuit; the pressure regulating assembly is connected to the controller, and when the slewing pressure sensor and the lifting pressure sensor simultaneously detect a pilot pressure signal, the controller controls the pressure regulating assembly to adjust the pressure in the pilot oil circuit connected to the pressure regulating assembly. The pressure regulating assembly can adjust the difference between the slewing speed of the slewing motor and the lifting speed of the boom to accommodate various working conditions.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and in particular to a hydraulic system and a hydraulic system control method. Background Art

[0002] An excavator is an earth-moving machine that uses a bucket to dig materials above or below the base surface and load them into transport vehicles or unload them to a stockpile.

[0003] During operation, excavators often use a compound action of boom lifting and rotating. In this compound action, the flow of the hydraulic system tends to flow to the lighter-loaded rotary motor, causing the rotary motor's rotation speed to be greater than the boom's lifting speed.

[0004] During construction, different working conditions require different differences between the slew motor's rotation speed and the boom's lifting speed. However, existing excavators cannot adjust the difference between the slew motor's rotation speed and the boom's lifting speed, making it difficult to adapt to various working conditions. Summary of the Invention

[0005] The object of the present invention is to provide a hydraulic system to solve the technical problem that the hydraulic system in the prior art is difficult to adapt to various working conditions.

[0006] The hydraulic system provided by the present invention comprises a rotary pilot oil circuit, a lifting pilot oil circuit and a control mechanism;

[0007] The control mechanism includes a controller, a rotary pressure sensor, a lifting pressure sensor and a pressure regulating assembly;

[0008] The rotary pressure sensor is arranged on the rotary pilot oil circuit, and is used to detect the pilot pressure signal of the rotary pilot oil circuit and send it to the controller;

[0009] The lifting pressure sensor is arranged on the lifting pilot oil circuit, and is used to detect the pilot pressure signal of the lifting pilot oil circuit and send it to the controller;

[0010] The pressure regulating component is arranged on the lifting pilot oil circuit and / or the rotary pilot oil circuit; the pressure regulating component is connected to the controller, and when the rotary pressure sensor and the lifting pressure sensor detect the pilot pressure signal at the same time, the controller controls the pressure regulating component to adjust the pressure of the pilot oil circuit connected to the pressure regulating component.

[0011] Furthermore, the hydraulic system further comprises a rotary switching valve and a rotary pilot valve;

[0012] The rotary switching valve includes a first switching oil port and a second switching oil port;

[0013] The rotary pilot oil circuit includes a first rotary pilot oil circuit and a second rotary pilot oil circuit, the first reversing oil port is connected to the rotary pilot valve via the first rotary pilot oil circuit, and the second reversing oil port is connected to the rotary pilot valve via the second rotary pilot oil circuit;

[0014] The first rotary pilot oil circuit and the second rotary pilot oil circuit are respectively provided with the rotary pressure sensor; the pressure regulating assembly is respectively communicated with the first rotary pilot oil circuit and the second rotary pilot oil circuit.

[0015] Furthermore, the pressure regulating assembly includes a shuttle valve and a relief valve;

[0016] The two inlets of the shuttle valve are respectively connected to the first rotary pilot oil circuit and the second rotary pilot oil circuit, and the outlet of the shuttle valve is connected to the relief valve;

[0017] The relief valve is connected to the controller. When the rotary pressure sensor and the lift pressure sensor detect the pilot pressure signal at the same time, the controller controls the relief valve to reduce the relief pressure.

[0018] Furthermore, the hydraulic system further comprises a lifting reversing valve and a lifting pilot valve;

[0019] The lifting reversing valve includes a third reversing oil port; the lifting pilot valve is connected to the third reversing oil port through the lifting pilot oil circuit.

[0020] Furthermore, the lifting reversing valve further includes a fourth reversing oil port; the lifting pilot valve is connected to the fourth reversing oil port via a descending pilot oil circuit;

[0021] The control mechanism further includes a descending pressure sensor; the descending pressure sensor is arranged on the descending pilot oil circuit, and is used to detect the pilot pressure signal of the descending pilot oil circuit and send it to the controller.

[0022] Furthermore, the hydraulic system further comprises a lifting reversing valve and a lifting pilot valve;

[0023] The lifting reversing valve includes a third reversing oil port; the lifting pilot valve is connected to the third reversing oil port through the lifting pilot oil circuit; and the pressure regulating assembly is in communication with the lifting pilot oil circuit.

[0024] Furthermore, the lifting reversing valve further includes a fourth reversing oil port;

[0025] The lifting pilot valve is connected to the fourth reversing oil port via a descending pilot oil circuit;

[0026] The control mechanism further includes a descending pressure sensor; the descending pressure sensor is arranged on the descending pilot oil circuit, and is used to detect the pilot pressure signal of the descending pilot oil circuit and send it to the controller;

[0027] The pressure regulating assembly is communicated with the lifting pilot oil circuit and the lowering pilot oil circuit respectively.

[0028] Furthermore, the pressure regulating assembly includes a shuttle valve and a relief valve;

[0029] The two inlets of the shuttle valve are respectively connected to the lifting pilot oil circuit and the lowering pilot oil circuit, and the outlet of the shuttle valve is connected to the relief valve;

[0030] The relief valve is connected to the controller. When the rotary pressure sensor and the lift pressure sensor detect pilot pressure signals at the same time, the controller controls the relief pressure of the relief valve to decrease.

[0031] Furthermore, the hydraulic system further comprises a rotary switching valve and a rotary pilot valve;

[0032] The rotary switching valve includes a first switching oil port and a second switching oil port;

[0033] The rotary pilot oil circuit includes a first rotary pilot oil circuit and a second rotary pilot oil circuit, the first reversing oil port is connected to the rotary pilot valve via the first rotary pilot oil circuit, and the second reversing oil port is connected to the rotary pilot valve via the second rotary pilot oil circuit;

[0034] The first rotary pilot oil circuit and the second rotary pilot oil circuit are respectively provided with the rotary pressure sensor.

[0035] The present invention also aims to provide a hydraulic system control method, comprising the following steps:

[0036] Detect the pilot pressure signal of the rotary pilot oil circuit and the pilot pressure signal of the lifting pilot oil circuit;

[0037] When it is necessary to adjust the priority of the boom lifting action over the swing action, when the pilot pressure signals are detected in the swing pilot oil circuit and the lifting pilot oil circuit respectively, the swing pilot oil circuit is controlled to reduce the pressure;

[0038] When it is necessary to adjust the priority of the swing action over the boom lifting action, when the pilot pressure signals are detected in the swing pilot oil circuit and the lifting pilot oil circuit respectively, the lifting pilot oil circuit is controlled to reduce the pressure.

[0039] The hydraulic system provided by the present invention, when the hydraulic system drives the boom to lift and rotate simultaneously, the hydraulic oil drives the slewing reversing valve through the slewing pilot oil circuit, so that the hydraulic oil is supplied to the slewing motor to drive the boom to rotate; the hydraulic oil drives the lifting reversing valve through the lifting pilot oil circuit, so that the hydraulic oil is supplied to the boom cylinder to drive the boom to lift. When the pressure regulating component is set on the swing pilot oil circuit, when the hydraulic system drives the boom lifting and swinging actions at the same time, hydraulic oil flows into the swing pilot oil circuit and the lifting hydraulic oil circuit, and the swing pressure sensor and the lifting pressure sensor can detect the pilot pressure signal at the same time. At this time, the controller controls the pressure regulating component to reduce the pressure of the swing pilot oil circuit, so that the pressure of the swing pilot oil circuit is reduced to an appropriate size, and the spool stroke of the swing reversing valve core cannot reach the maximum, thereby limiting the flow of hydraulic oil into the swing motor through the swing reversing valve, and then limiting the speed of the swing motor, achieving the purpose of adjusting the priority of the boom lifting relative to the swing action, and the priority of the boom lifting action relative to the swing action can be controlled by the pressure regulating component; when the pressure regulating component is set on the lifting pilot oil circuit, when the hydraulic system drives the boom lifting and swinging actions at the same time, hydraulic oil flows into the swing pilot oil circuit and the lifting hydraulic oil circuit, and the swing pressure sensor and the lifting pressure sensor can detect the pilot pressure signal at the same time. At this time, the controller controls the pressure regulating component to reduce the pressure of the swing pilot oil circuit The low lifting pilot oil circuit pressure reduces the lifting pilot oil circuit pressure, and the lifting reversing valve core stroke cannot reach the maximum, thereby limiting the flow of hydraulic oil into the boom cylinder through the lifting reversing valve, and further limiting the speed of the boom cylinder, thereby achieving the purpose of adjusting the priority of the rotary action relative to the boom lifting action, and the priority of the rotary action relative to the boom lifting action can be controlled by the pressure regulating component; the pressure regulating component is set in the rotary pilot oil circuit and the lifting pilot oil circuit, when it is necessary to achieve the purpose of adjusting the priority of the rotary action relative to the boom lifting action, when the rotary pressure sensor and the lifting pressure sensor simultaneously detect the pilot pressure signal, the controller controls the pressure regulating component to reduce the pressure of the lifting pilot oil circuit and keep the pressure of the rotary pilot oil circuit unchanged; when it is necessary to achieve the purpose of adjusting the priority of the boom lifting action relative to the rotary action, when the rotary pressure sensor and the lifting pressure sensor simultaneously detect the pilot pressure signal, the controller controls the pressure regulating component to reduce the pressure of the rotary pilot oil circuit and keep the pressure of the lifting pilot oil circuit unchanged. In summary, the hydraulic system provided by the present invention can adjust the difference between the rotation speed of the rotary motor and the lifting speed of the boom to adapt to various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 This is a schematic structural diagram of a hydraulic system in an embodiment of the present invention;

[0042] Figure 2 It is a structural diagram of a hydraulic system in another implementation manner provided by an embodiment of the present invention.

[0043] Icons: 1-lifting pilot oil circuit; 2-slewing pilot oil circuit; 21-first slewing pilot oil circuit; 22-second slewing pilot oil circuit; 3-control mechanism; 31-controller; 32-slewing pressure sensor; 33-lifting pressure sensor; 34-overflow valve; 35-shuttle valve; 36-descending pressure sensor; 4-slewing reversing valve; 5-slewing pilot valve; 6-lifting reversing valve; 7-lifting pilot valve; 8-slewing oil pump; 9-lifting oil pump; 10-descending pilot oil circuit; 11-boom cylinder; 12-slewing motor. DETAILED DESCRIPTION

[0044] The following is a clear and initial description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0045] The present invention provides a hydraulic system and a control method thereof. The hydraulic system and the control method thereof provided by the present invention are described in detail in the following with multiple embodiments.

[0046] The hydraulic system provided in this embodiment is as follows: Figures 1 to 2As shown, it includes a rotary pilot oil circuit 2, a lifting pilot oil circuit 1 and a control mechanism 3; the control mechanism 3 includes 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 circuit 2, for detecting the pilot pressure signal of the rotary pilot oil circuit 2 and sending it to the controller 31; the lifting pressure sensor 33 is arranged on the lifting pilot oil circuit 1, for detecting the pilot pressure signal of the lifting pilot oil circuit 1 and sending it to the controller 31; the pressure regulating assembly is arranged on the lifting pilot oil circuit 1 and / or the rotary pilot oil circuit 2; the pressure regulating assembly is connected to the controller 31, and when the rotary pressure sensor 32 and the lifting pressure sensor 33 detect the pilot pressure signal at the same time, the controller 31 controls the pressure regulating assembly to adjust the pressure of the pilot oil circuit connected to the pressure regulating assembly.

[0047] When the hydraulic system drives the boom to lift and rotate at the same time, the hydraulic oil pushes the slew reversing valve 4 through the slew pilot oil circuit 2, so that the hydraulic oil is supplied to the slew motor 12 to drive the boom to rotate; the hydraulic oil pushes the lifting reversing valve 6 through the lifting pilot oil circuit 1, so that the hydraulic oil is supplied to the boom cylinder 11 to drive the boom to lift.

[0048] When the pressure regulating assembly is set on the slewing pilot oil circuit 2, when the hydraulic system drives the boom lifting and slewing actions at the same time, hydraulic oil flows into both the slewing pilot oil circuit 2 and the lifting hydraulic oil circuit, and the slewing pressure sensor 32 and the lifting pressure sensor 33 can simultaneously detect the pilot pressure signal. At this time, the controller 31 controls the pressure regulating assembly to reduce the pressure of the slewing pilot oil circuit 2, so that the pressure of the slewing pilot oil circuit 2 is reduced, and the valve core stroke of the slewing reversing valve 4 cannot reach the maximum, thereby limiting the flow of hydraulic oil through the slewing reversing valve 4 into the slewing motor 12, and further limiting the speed of the slewing motor 12, achieving the purpose of giving priority to the boom lifting action over the slewing action. In addition, the priority of the boom lifting action over the slewing action can be controlled by the pressure regulating assembly. The pressure regulating assembly can reduce the pressure of the slewing pilot oil circuit 2 to an appropriate level according to the priority requirements.

[0049] When the pressure regulating assembly is set on the lifting pilot oil circuit 1, when the hydraulic system drives the boom lifting and rotating actions simultaneously, hydraulic oil flows into the rotating pilot oil circuit 2 and the lifting hydraulic oil circuit. The rotating pressure sensor 32 and the lifting pressure sensor 33 can simultaneously detect the pilot pressure signal. At this time, the controller 31 controls the pressure regulating assembly to reduce the pressure of the lifting pilot oil circuit 1, so that the pressure of the lifting pilot oil circuit 1 is reduced, and the spool stroke of the lifting reversing valve cannot reach the maximum, thereby limiting the flow of hydraulic oil through the lifting reversing valve into the boom cylinder 11, and further limiting the speed of the boom cylinder 11, achieving the purpose of giving priority to the boom rotation over the lifting action. In addition, the priority of the rotating action over the boom lifting action can be controlled by the pressure regulating assembly. The pressure regulating assembly can reduce the pressure of the lifting pilot oil circuit 1 to an appropriate level according to the priority requirements.

[0050] When the pressure regulating component is set in the swing pilot oil circuit 2 and the lifting pilot oil circuit 1, when it is necessary to achieve the purpose of adjusting the swing action to have priority over the boom lifting action, when the swing pressure sensor 32 and the lifting pressure sensor 33 simultaneously detect the pilot pressure signal, the controller controls the pressure regulating component to reduce the pressure of the lifting pilot oil circuit 1 and keep the pressure of the swing pilot oil circuit 2 unchanged; when it is necessary to achieve the purpose of adjusting the boom lifting action to have priority over the swing action, when the swing pressure sensor 32 and the lifting pressure sensor 33 simultaneously detect the pilot pressure signal, the controller controls the pressure regulating component to reduce the pressure of the swing pilot oil circuit 2 and keep the pressure of the lifting pilot oil circuit 1 unchanged.

[0051] The hydraulic system provided in this embodiment can give priority to boom rotation over lifting action or boom lifting over rotation action, thereby adjusting the difference between the rotation speed of the rotary motor and the lifting speed of the boom to adapt to various working conditions.

[0052] In addition, compared with the hydraulic system in the prior art, the hydraulic system provided by this embodiment only needs to add a control mechanism 3, and its cost and structural complexity are lower.

[0053] As an embodiment, when the pressure regulating assembly is connected to the rotary pilot oil circuit 2, as shown in FIG. Figure 1 As shown, the hydraulic system also includes a rotary directional valve 4 and a rotary pilot valve 5; the rotary directional valve 4 includes a first reversing oil port and a second reversing oil port; the rotary pilot oil circuit 2 includes a first rotary pilot oil circuit 21 and a second rotary pilot oil circuit 22, the first reversing oil port is connected to the rotary pilot valve 5 through the first rotary pilot oil circuit 21, and the second reversing oil port is connected to the rotary pilot valve 5 through the second rotary pilot oil circuit 22; a rotary pressure sensor 32 is respectively provided on the first rotary pilot oil circuit 21 and the second rotary pilot oil circuit 22; the pressure regulating assembly is respectively connected to the first rotary pilot oil circuit 21 and the second rotary pilot oil circuit 22.

[0054] Specifically, the hydraulic system also includes a swing oil pump 8, which is connected to the oil inlet of the swing reversing valve 4 to supply oil to the swing motor 12 through the swing reversing valve 4, thereby driving the boom to rotate. After the first swing pilot oil circuit 21 supplies oil, the swing reversing valve 4 is pushed to the first position, at which point the swing motor 12 can rotate in the first direction. After the second swing pilot oil circuit 22 supplies oil, the swing reversing valve 4 is pushed to the second position, at which point the swing motor 12 can rotate in the second direction, with the first direction and the second direction being opposite.

[0055] When driving the boom to lift and rotate toward the first direction at the same time, hydraulic oil flows into both the first rotary pilot oil circuit 21 and the lifting hydraulic oil circuit. The rotary pressure sensor 32 and the lifting pressure sensor 33 on the first rotary pilot oil circuit 21 can detect the pilot pressure signal at the same time. At this time, the controller 31 controls the pressure regulating component to reduce the pressure of the first rotary pilot oil circuit 21. The valve core stroke of the rotary reversing valve 4 cannot reach the maximum, thereby limiting the flow of hydraulic oil through the rotary reversing valve 4 into the rotary motor 12, and then limiting the speed of the rotary motor 12, thereby achieving the purpose of giving priority to the boom lifting over the rotating action toward the first direction.

[0056] When driving the boom to lift and rotate toward the second direction at the same time, hydraulic oil flows into both the second rotary pilot oil circuit 22 and the lifting hydraulic oil circuit. The rotary pressure sensor 32 and the lifting pressure sensor 33 on the second rotary pilot oil circuit 22 can detect the pilot pressure signal at the same time. At this time, the controller 31 controls the pressure regulating component to reduce the pressure of the second rotary pilot oil circuit 22. The valve core stroke of the rotary reversing valve 4 cannot reach the maximum, thereby limiting the flow of hydraulic oil through the rotary reversing valve 4 into the rotary motor 12, and then limiting the speed of the rotary motor 12, thereby achieving the purpose of giving priority to the boom lifting over the rotating action toward the second direction.

[0057] When the controller 31 simultaneously receives pilot pressure signals from the rotary pressure sensor 32 and the lifting pressure sensor 33, it performs calculations based on the pilot pressure signals detected by the rotary pressure sensors 32 and 33, and adjusts the pressure of the rotary pilot oil circuit 2 based on the calculation results, thereby reducing the pilot pressure of the rotary pilot oil circuit 2. The spool of the rotary reversing valve 4 cannot reach its maximum stroke, the hydraulic oil flow in the rotary motor 12 is low, and the rotation speed is slow. However, the pilot pressure of the lifting pilot oil circuit 1 does not decrease, the spool of the lifting reversing valve can reach its maximum stroke, the hydraulic oil flow in the boom cylinder 11 is high, and the boom is lifted faster, thus achieving the purpose of giving priority to the lifting action over the boom rotation. The control mechanism 3 has a simple structure and is easy to implement. The priority of the boom lifting action over the rotating action can be precisely controlled by the program of the controller 31, with high accuracy.

[0058] Furthermore, the pressure regulating assembly includes a shuttle valve 35 and a relief valve 34; the two inlets of the shuttle valve 35 are respectively connected to the first rotary pilot oil circuit 21 and the second rotary pilot oil circuit 22, and the outlet of the shuttle valve 35 is connected to the relief valve 34; the relief valve 34 is connected to the controller 31, and when the rotary pressure sensor 32 and the lifting pressure sensor 33 detect the pilot pressure signal at the same time, the controller 31 controls the relief valve 34 to reduce the relief pressure.

[0059] When pilot oil flows into the first rotary pilot oil circuit 21, the first rotary pilot oil circuit 21 is connected to the overflow valve 34 through the shuttle valve 35, and the overflow valve 34 can adjust the pressure in the first rotary pilot oil circuit 21; when pilot oil flows into the second rotary pilot oil circuit 22, the second rotary pilot oil circuit 22 is connected to the overflow valve 34 through the shuttle valve 35, and the overflow valve 34 can adjust the pressure in the second rotary pilot oil circuit 22.

[0060] In addition, the pressure regulating assembly may also include a first overflow valve and a second overflow valve; the first overflow valve is connected to the first rotary pilot oil circuit 21, and the second overflow valve is connected to the second rotary pilot oil circuit 22; the first overflow valve and the second overflow valve are respectively connected to the controller 31, and when the rotary pressure sensor 32 and the lifting pressure sensor 33 on the first rotary pilot oil circuit 21 detect the pilot pressure signal at the same time, the controller 31 controls the overflow pressure of the first overflow valve to decrease; when the rotary pressure sensor 32 and the lifting pressure sensor 33 on the second rotary pilot oil circuit 22 detect the pilot pressure signal at the same time, the controller 31 controls the overflow pressure of the second overflow valve to decrease.

[0061] When the boom is driven to lift and rotate in the first direction at the same time, hydraulic oil flows into both the first rotary pilot oil circuit 21 and the lifting hydraulic oil circuit. The rotary pressure sensor 32 and the lifting pressure sensor 33 on the first rotary pilot oil circuit 21 can detect the pilot pressure signal at the same time. At this time, the controller 31 controls the first overflow valve to reduce the overflow pressure, thereby reducing the pressure of the first rotary pilot oil circuit 21.

[0062] When the boom is driven to lift and rotate in the second direction at the same time, hydraulic oil flows into both the second rotary pilot oil circuit 22 and the lifting hydraulic oil circuit. The rotary pressure sensor 32 and the lifting pressure sensor 33 on the second rotary pilot oil circuit 22 can detect the pilot pressure signal at the same time. At this time, the second overflow valve of the controller 31 reduces the overflow pressure, thereby reducing the pressure of the second rotary pilot oil circuit 22.

[0063] Furthermore, the hydraulic system also includes a lifting reversing valve 6 and a lifting pilot valve 7; the lifting reversing valve 6 includes a third reversing oil port; the lifting pilot valve 7 is connected to the third reversing oil port through the lifting pilot oil circuit 1.

[0064] When the operator operates the boom lifting and rotating actions at the same time, the pilot oil from the lifting pilot valve 7 pushes the lifting reversing valve 6 to operate, and the lifting oil pump 9 supplies the hydraulic oil to the boom cylinder 11 through the lifting reversing valve 6 to lift the boom. The pilot oil from the rotating pilot valve 5 pushes the rotating reversing valve 4 to operate, and the rotating oil pump 8 supplies the hydraulic oil to the rotating motor 12 to rotate the rotating motor 12. At the same time, the lifting pressure sensor 33 obtains the pilot pressure signal of the boom lifting and transmits it to the controller 31, and the rotating pressure sensor 32 on the first rotating pilot oil circuit 21 or the second rotating pilot oil circuit 22 obtains the rotating pilot pressure signal and transmits it to the controller 31. When the rotating pressure sensor 32 and the lifting pressure sensor 33 can detect the pilot pressure signals at the same time, the controller 31 outputs an electrical signal to the overflow valve 34, and the overflow pressure of the overflow valve 34 is reduced.

[0065] Furthermore, the lifting reversing valve 6 also includes a fourth reversing oil port; the lifting pilot valve 7 is connected to the fourth reversing oil port through a descending pilot oil circuit 10; the control mechanism 3 also includes a descending pressure sensor 36; the descending pressure sensor 36 is arranged on the descending pilot oil circuit 10, for detecting the pilot pressure signal of the descending pilot oil circuit 10 and sending it to the controller 31.

[0066] When the pilot oil flows into the descending pilot oil circuit 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, causing the boom to descend.

[0067] When the boom is lowering, the lowering pressure sensor 36 can detect the pilot pressure signal of the lowering pilot oil circuit 10 and send it to the controller 31 so that the controller 31 can obtain the lowering state of the boom.

[0068] As another embodiment, when the pressure regulating assembly is connected to the lifting pilot oil circuit 1, as shown in FIG. Figure 2 As shown, the hydraulic system also includes a lifting reversing valve 6 and a lifting pilot valve 7; the lifting reversing valve 6 includes a third reversing oil port; the lifting pilot valve 7 is connected to the third reversing oil port through the lifting pilot oil circuit 1; and the pressure regulating assembly is connected to the lifting pilot oil circuit 1.

[0069] Specifically, the hydraulic system further includes a lifting oil pump 9 , which is connected to the oil inlet of the lifting reversing valve 6 to supply oil to the boom cylinder 11 through the lifting reversing valve 6 , thereby driving the boom to rise and fall.

[0070] When the boom is driven to lift and slew at the same time, hydraulic oil flows into both the slewing pilot oil circuit 2 and the lifting hydraulic oil circuit. The slewing pressure sensor 32 and the lifting pressure sensor 33 on the slewing pilot oil circuit 2 can detect the pilot pressure signal at the same time. At this time, the controller 31 controls the pressure regulating component to reduce the pressure of the lifting pilot oil circuit 1. The valve core stroke of the lifting reversing valve 6 cannot reach the maximum, thereby limiting the flow of hydraulic oil into the boom cylinder 11 through the lifting reversing valve 6, and then limiting the speed of boom lifting, thereby achieving the purpose of giving priority to the slewing action over the boom lifting action.

[0071] When the controller 31 simultaneously receives pilot pressure signals from the rotary pressure sensor 32 and the lifting pressure sensor 33, it performs calculations based on the magnitude of the pilot pressure signals detected by the rotary pressure sensor 32 and the lifting pressure sensor 33, and adjusts the pilot pressure of the lifting pilot oil circuit 1 based on the calculation results, thereby reducing the pilot pressure of the lifting pilot oil circuit 1, preventing the valve core of the lifting reversing valve 6 from reaching its maximum stroke, resulting in a low flow of hydraulic oil in the boom cylinder 11 and a slow lifting speed. However, the pilot pressure of the rotary pilot oil circuit 2 does not decrease, allowing the valve core of the rotary reversing valve 4 to reach its maximum stroke, increasing the flow of hydraulic oil in the rotary motor 12 and causing the boom to rotate faster, thereby achieving the purpose of giving priority to the rotary action over the boom lifting action. The control mechanism 3 has a simple structure and is easy to implement. The priority of the boom lifting action over the rotary action can be precisely controlled by the program of the controller 31, with high accuracy.

[0072] Furthermore, the lifting reversing valve 6 also includes a fourth reversing oil port; the lifting pilot valve 7 is connected to the fourth reversing oil port through a descending pilot oil circuit 10; the control mechanism 3 also includes a descending pressure sensor 36; the descending pressure sensor 36 is arranged on the descending pilot oil circuit 10, for detecting the pilot pressure signal of the descending pilot oil circuit 10 and sending it to the controller 31; the pressure regulating component is respectively connected to the lifting pilot oil circuit 1 and the descending pilot oil circuit 10.

[0073] When pilot oil flows into the lowering pilot oil circuit 10, the pilot oil pushes the lift reversing valve 6 through the fourth reversing oil port, allowing the hydraulic oil in the boom cylinder 11 to flow back to the oil tank through the lift reversing valve 6, causing the boom to lower. When the boom is lowering, the lowering pressure sensor 36 can detect the pilot pressure signal in the lowering pilot oil circuit 10 and send it to the controller 31, so that the controller 31 can understand the lowering status of the boom.

[0074] Furthermore, the pressure regulating assembly includes a shuttle valve 35 and a relief valve 34; the two inlets of the shuttle valve 35 are respectively connected to the lifting pilot oil circuit 1 and the lowering pilot oil circuit 10, and the outlet of the shuttle valve 35 is connected to the relief valve 34; the relief valve 34 is connected to the controller 31, and when the rotary pressure sensor 32 and the lifting pressure sensor 33 detect the pilot pressure signal at the same time, the controller 31 controls the relief pressure of the relief valve 34 to decrease.

[0075] When pilot oil flows into the lifting pilot oil circuit 1, the lifting pilot oil circuit 1 is connected to the overflow valve 34 through the shuttle valve 35, and the overflow valve 34 can adjust the pressure in the lifting pilot oil circuit 1; when pilot oil flows into the descending pilot oil circuit 10, the descending pilot oil circuit 10 is connected to the overflow valve 34 through the shuttle valve 35, and the overflow valve 34 can adjust the pressure in the descending pilot oil circuit 10.

[0076] Furthermore, the hydraulic system also includes a rotary reversing valve 4 and a rotary pilot valve 5; the rotary reversing valve 4 includes a first reversing oil port and a second reversing oil port; the rotary pilot oil circuit 2 includes a first rotary pilot oil circuit 21 and a second rotary pilot oil circuit 22, the first reversing oil port is connected to the rotary pilot valve 5 through the first rotary pilot oil circuit 21, and the second reversing oil port is connected to the rotary pilot valve 5 through the second rotary pilot oil circuit 22; a rotary pressure sensor 32 is respectively provided on the first rotary pilot oil circuit 21 and the second rotary pilot oil circuit 22.

[0077] After the first rotary pilot oil circuit 21 is supplied with oil, the rotary reversing valve 4 is pushed to reverse to the first position, and the rotary motor 12 can rotate in the first direction; after the second rotary pilot oil circuit 22 is supplied with oil, the rotary reversing valve 4 is pushed to reverse to the second position, and the rotary motor 12 can rotate in the second direction, and the first direction is opposite to the second direction.

[0078] The hydraulic system provided in this embodiment can achieve priority of boom rotation over lifting action or priority of boom lifting over rotation action, thereby synchronizing boom lifting and rotation actions. Compared with the hydraulic system in the prior art, the hydraulic system provided in this embodiment only requires the addition of a control mechanism 3, and its cost and structural complexity are lower.

[0079] The hydraulic system control method provided in this embodiment includes the following steps:

[0080] Detect the pilot pressure signal of the rotary pilot oil circuit 2 and the pilot pressure signal of the lifting pilot oil circuit 1;

[0081] When it is necessary to adjust the priority of the boom lifting action over the swing action, when the pilot pressure signals are detected on the swing pilot oil circuit 2 and the lifting pilot oil circuit 1 respectively, the swing pilot oil circuit 2 is controlled to reduce the pressure;

[0082] When it is necessary to adjust the priority of the swing action over the boom lifting action, when the pilot pressure signals are detected on the swing pilot oil circuit 2 and the lifting pilot oil circuit 1 respectively, the lifting pilot oil circuit 1 is controlled to reduce the pressure.

[0083] The hydraulic system control method provided in this embodiment can realize the priority of boom rotation over lifting action or boom lifting over rotation action, thereby adjusting the difference between the rotation speed of the rotary motor and the lifting speed of the boom to adapt to various working conditions.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic system, characterized in that: Including rotary pilot oil circuit, lifting pilot oil circuit and control mechanism; The control mechanism includes 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 circuit, and is used to detect the pilot pressure signal of the rotary pilot oil circuit and send it to the controller; The lifting pressure sensor is arranged on the lifting pilot oil circuit, and is used to detect the pilot pressure signal of the lifting pilot oil circuit and send it to the controller; The pressure regulating assembly is arranged on the lifting pilot oil circuit and / or the swing pilot oil circuit; the pressure regulating assembly is connected to the controller, and when the swing pressure sensor and the lifting pressure sensor simultaneously detect the pilot pressure signal, the controller controls the pressure regulating assembly to regulate the pressure of the pilot oil circuit connected to the pressure regulating assembly, and the hydraulic system further includes a swing switching valve and a swing pilot valve; The rotary switching valve includes a first switching oil port and a second switching oil port; The rotary pilot oil circuit includes a first rotary pilot oil circuit and a second rotary pilot oil circuit, the first reversing oil port is connected to the rotary pilot valve via the first rotary pilot oil circuit, and the second reversing oil port is connected to the rotary pilot valve via the second rotary pilot oil circuit; The first rotary pilot oil circuit and the second rotary pilot oil circuit are respectively provided with the rotary pressure sensor; the pressure regulating assembly is respectively connected to the first rotary pilot oil circuit and the second rotary pilot oil circuit, and the pressure regulating assembly includes a shuttle valve and a relief valve; The two inlets of the shuttle valve are respectively connected to the first rotary pilot oil circuit and the second rotary pilot oil circuit, and the outlet of the shuttle valve is connected to the relief valve; The relief valve is connected to the controller. When the rotary pressure sensor and the lift pressure sensor detect the pilot pressure signal at the same time, the controller controls the relief valve to reduce the relief pressure.

2. The hydraulic system according to claim 1, characterized in that The hydraulic system also includes a lifting reversing valve and a lifting pilot valve; The lifting reversing valve includes a third reversing oil port; the lifting pilot valve is connected to the third reversing oil port through the lifting pilot oil circuit.

3. The hydraulic system according to claim 2, characterized in that The lifting reversing valve further includes a fourth reversing oil port; the lifting pilot valve is connected to the fourth reversing oil port via a descending pilot oil circuit; The control mechanism further includes a descending pressure sensor; the descending pressure sensor is arranged on the descending pilot oil circuit, and is used to detect the pilot pressure signal of the descending pilot oil circuit and send it to the controller.

4. The hydraulic system according to claim 1, characterized in that The hydraulic system also includes a lifting reversing valve and a lifting pilot valve; The lifting reversing valve includes a third reversing oil port; the lifting pilot valve is connected to the third reversing oil port through the lifting pilot oil circuit; and the pressure regulating assembly is in communication with the lifting pilot oil circuit.

5. The hydraulic system according to claim 4, characterized in that The lifting reversing valve further includes a fourth reversing oil port; The lifting pilot valve is connected to the fourth reversing oil port via a descending pilot oil circuit; The control mechanism further includes a descending pressure sensor; the descending pressure sensor is arranged on the descending pilot oil circuit, and is used to detect the pilot pressure signal of the descending pilot oil circuit and send it to the controller; The pressure regulating assembly is communicated with the lifting pilot oil circuit and the lowering pilot oil circuit respectively.

6. The hydraulic system according to claim 4, characterized in that The hydraulic system also includes a rotary switching valve and a rotary pilot valve; The rotary switching valve includes a first switching oil port and a second switching oil port; The rotary pilot oil circuit includes a first rotary pilot oil circuit and a second rotary pilot oil circuit, the first reversing oil port is connected to the rotary pilot valve via the first rotary pilot oil circuit, and the second reversing oil port is connected to the rotary pilot valve via the second rotary pilot oil circuit; The first rotary pilot oil circuit and the second rotary pilot oil circuit are respectively provided with the rotary pressure sensor.

7. A hydraulic system control method, used for the hydraulic system according to claim 1, characterized in that: The following steps are involved: Detect the pilot pressure signal of the rotary pilot oil circuit and the pilot pressure signal of the lifting pilot oil circuit; When it is necessary to adjust the priority of the boom lifting action over the swing action, when the pilot pressure signals are detected in the swing pilot oil circuit and the lifting pilot oil circuit respectively, the swing pilot oil circuit is controlled to reduce the pressure; When it is necessary to adjust the priority of the swing action over the boom lifting action, when the pilot pressure signals are detected in the swing pilot oil circuit and the lifting pilot oil circuit respectively, the lifting pilot oil circuit is controlled to reduce the pressure.

Images