Outrigger hydraulic control system, outrigger hydraulic control method, and engineering machinery

Abstract

This invention relates to the field of engineering machinery technology, and discloses a hydraulic control system for outriggers, a hydraulic control method for outriggers, and engineering machinery. The system includes a delivery oil circuit for supplying oil to the outrigger cylinders; a safety control valve assembly connected to the delivery oil circuit; a first connecting oil circuit between the safety control valve assembly and the rodless chamber of the outrigger cylinder; and a second connecting oil circuit and a bypass oil circuit between the safety control valve assembly and the rod chamber of the outrigger cylinder. A monitoring unit is electrically connected to the safety control valve assembly and configured to: acquire the current pressure of the rodless and rod chambers in real time; when the outrigger cylinder is working, if the current pressure of the rod chamber reaches a first preset value, control the second connecting oil circuit and the bypass oil circuit to connect to the rod chamber; if the current pressure of the rod chamber reaches a second preset value, control the delivery oil circuit to stop supplying oil and start returning oil; when the outrigger cylinder stops working, if the current pressure of the rodless and rod chambers changes abruptly, control the first connecting oil circuit, the second connecting oil circuit, and the bypass oil circuit to disconnect.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, specifically relating to a hydraulic control system for outriggers, a hydraulic control method for outriggers, and engineering machinery. Background Technology

[0002] To ensure the proper functioning of the vertical hydraulic cylinder, the inlet and outlet oil passages of the vertical hydraulic cylinder must remain unobstructed when the vertical hydraulic cylinder extends to support the work platform. In particular, to ensure the stability and safe operation of the work platform, if the pressure inside the vertical hydraulic cylinder increases rapidly due to a malfunction when the vertical hydraulic cylinder is locked at a certain height, the vertical hydraulic cylinder is prone to internal leakage and damage, or even cause a safety accident. However, there is a lack of corresponding countermeasures in the existing technology. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulic control system for outriggers, a hydraulic control method for outriggers, and engineering machinery to solve the technical problem of outriggers being ineffective due to internal leakage in the hydraulic cylinders of outriggers.

[0004] To achieve the above objectives, the present invention provides a hydraulic control system for an outrigger, the hydraulic control system for an outrigger comprising:

[0005] Outrigger cylinder;

[0006] Oil supply circuit for supplying oil to the outrigger cylinders;

[0007] The safety control valve assembly is connected to the delivery oil circuit. A first connecting oil circuit is provided between the safety control valve assembly and the rodless chamber of the outrigger cylinder. A second connecting oil circuit and a side branch oil circuit are provided between the safety control valve assembly and the rod chamber of the outrigger cylinder.

[0008] The monitoring unit is electrically connected to the safety control valve assembly and is configured as follows:

[0009] Real-time acquisition of the current pressure in the rodless and rod-side chambers;

[0010] When the outrigger cylinder is working, when the current pressure in the rod chamber reaches the first preset value, the second connecting oil circuit and the side branch oil circuit are connected to the rod chamber.

[0011] When the current pressure in the rod chamber reaches the second preset value, the control oil supply circuit stops supplying oil and starts returning oil, wherein the second preset value is greater than the first preset value;

[0012] When the outrigger cylinder stops working, and the current pressure in the rodless chamber and the rod chamber changes abruptly, the first connecting oil circuit, the second connecting oil circuit, and the side branch oil circuit are all disconnected.

[0013] In an embodiment of the present invention, the outrigger hydraulic control system further includes a reversing valve disposed on the oil delivery line. One side port of the reversing valve is connected to the oil tank, and the other side port is connected to the rodless chamber and the rod chamber of the outrigger cylinder. A safety control valve assembly is disposed between the reversing valve and the outrigger cylinder.

[0014] In an embodiment of the present invention, the oil delivery circuit includes a first working oil circuit and a second working oil circuit, and the safety control valve group includes a first safety valve assembly and a second safety valve assembly. The first safety valve assembly is disposed on the first working oil circuit and connected to the first connecting oil circuit, and the second safety valve assembly is disposed on the second working oil circuit and connected to the second connecting oil circuit.

[0015] In an embodiment of the present invention, the second safety valve assembly includes a second locking valve, a second hydraulic lock, and a relief valve. A bypass oil passage is provided between the second working oil passage and the second connecting oil passage. The relief valve is located on the bypass oil passage. The two ends of the second hydraulic lock are respectively connected to the inlet and outlet of the bypass oil passage. The two oil ports on both sides of the second locking valve are respectively connected to the reversing valve and the second hydraulic lock. The monitoring unit is further configured as follows:

[0016] When the outrigger cylinder is working, if the second hydraulic lock is stuck and the oil pressure in the rod chamber reaches the first preset value, the overflow valve is opened.

[0017] When both the second hydraulic lock and the relief valve are stuck and the current pressure in the rod chamber reaches the second preset value, the first working oil circuit is controlled to stop oil supply and start oil return.

[0018] In an embodiment of the present invention, the first safety valve assembly includes a first locking valve and a first hydraulic lock, and the monitoring unit is further configured to: when the outrigger cylinder stops working, and the current pressure of the rodless chamber and the rod chamber changes abruptly, control both the first locking valve and the second locking valve to close.

[0019] In embodiments of the present invention, both the first safety valve assembly and the second safety valve assembly include a pressure sensor for detecting the oil pressure in the rod chamber or the rodless chamber.

[0020] In an embodiment of the present invention, the safety control valve assembly is integrated with the outrigger cylinder.

[0021] In an embodiment of the present invention, a hydraulic control method for outriggers is proposed and applied to the hydraulic control system for outriggers as described above. The hydraulic control method for outriggers includes:

[0022] Real-time acquisition of the current pressure in the rodless and rod-side chambers;

[0023] When the outrigger cylinder is working, when the current pressure in the rod chamber reaches the first preset value, the second connecting oil circuit and the side branch oil circuit are connected to the rod chamber.

[0024] When the current pressure in the rod chamber reaches the second preset value, the control oil supply circuit stops supplying oil and starts returning oil, wherein the second preset value is greater than the first preset value;

[0025] When the outrigger cylinder stops working, and the current pressure in the rodless chamber and the rod chamber changes abruptly, the first connecting oil circuit, the second connecting oil circuit, and the side branch oil circuit are all disconnected.

[0026] In an embodiment of the present invention, the outrigger hydraulic control system includes a relief valve. When the outrigger cylinder is working, the step of controlling the second connecting oil circuit and the bypass oil circuit to connect with the rod cavity when the current pressure in the rod cavity reaches a first preset value includes:

[0027] When the outrigger cylinder is working, if the second hydraulic lock is stuck and the oil pressure in the rod chamber reaches the first preset value, the overflow valve is opened.

[0028] In an embodiment of the present invention, the oil delivery circuit includes a first working oil circuit. When the current pressure in the rod chamber reaches a second preset value, the step of controlling the oil delivery circuit to stop supplying oil and start returning oil includes:

[0029] When both the second hydraulic lock and the relief valve are stuck and the current pressure in the rod chamber reaches the second preset value, the first working oil circuit is controlled to stop oil supply and start oil return.

[0030] In an embodiment of the present invention, an engineering machine is proposed, including the outrigger hydraulic control system described above.

[0031] Through the above technical solutions, the outrigger hydraulic control system, outrigger hydraulic control method, and engineering machinery provided by the embodiments of the present invention have the following beneficial effects:

[0032] In this embodiment, the outrigger hydraulic control system includes an outrigger cylinder, a delivery oil circuit, a safety control valve assembly, and a monitoring unit. The delivery oil circuit supplies oil to the outrigger cylinder. A first connecting oil circuit is provided between the safety control valve assembly and the rodless chamber of the outrigger cylinder, and a second connecting oil circuit and a bypass oil circuit are provided between the safety control valve assembly and the rod chamber of the outrigger cylinder. The monitoring unit is electrically connected to the safety control valve assembly and is used to acquire real-time pressure information of the rodless and rod chambers. When the outrigger cylinder is operating, if the monitoring unit detects that the pressure in the rod chamber reaches a first preset value, both the second connecting oil circuit and the bypass oil circuit are connected to the rod chamber to ensure effective oil return from the rod chamber side, preventing cylinder expansion due to oil circuit blockage and affecting the normal operation of the outrigger cylinder. When the monitoring unit detects that the pressure in the rod chamber reaches a second preset value, the monitoring unit transmits the pressure information to the safety control valve assembly, which then controls the delivery oil circuit to disconnect, stopping the oil supply to the outrigger cylinder and preventing further deterioration of the cylinder expansion. If the monitoring unit detects a sharp increase in pressure in both the rod chamber and the rodless chamber when the outrigger cylinder stops working, it indicates internal leakage in the outrigger cylinder. In this case, hydraulic oil in the rodless chamber will gradually flow into the rod chamber. Therefore, the first connecting oil circuit, the second connecting oil circuit, and the bypass oil circuit should be disconnected immediately to prevent the outrigger cylinder from experiencing a false leg due to backflow of hydraulic oil from the first and second connecting oil circuits.

[0033] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort. In the drawings:

[0035] Figure 1 This is a schematic diagram of the outrigger hydraulic control system from one perspective according to the present invention;

[0036] Figure 2 This is a structural schematic diagram of the outrigger hydraulic control system according to another perspective of the present invention;

[0037] Figure 3 This is a flowchart illustrating the hydraulic control method for outriggers according to the present invention.

[0038] Explanation of reference numerals in the attached figures

[0039] Detailed Implementation

[0040] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0041] The outrigger hydraulic control system, outrigger hydraulic control method, and engineering machinery according to the present invention are described below with reference to the accompanying drawings.

[0042] like Figure 1 and Figure 2 As shown, in this embodiment, a hydraulic control system for outriggers is proposed. The outrigger hydraulic control system includes an outrigger cylinder 1, a delivery oil circuit 2, a safety control valve assembly 3, and a monitoring unit 4. The delivery oil circuit 2 is used to supply oil to the outrigger cylinder 1; the safety control valve assembly 3 is connected to the delivery oil circuit 2, and a first connecting oil circuit 5 is provided between the safety control valve assembly 3 and the rodless chamber 11 of the outrigger cylinder 1, and a second connecting oil circuit 6 and a bypass oil circuit 7 are provided between the safety control valve assembly 3 and the rod chamber 12 of the outrigger cylinder 1; the monitoring unit 4 is electrically connected to the safety control valve assembly 3 and is configured to: acquire the current pressure of the rodless chamber 11 and the rod chamber 12 in real time; when the outrigger cylinder 1 is working, when the rod chamber 12 is in operation, the monitoring unit 4 monitors the pressure of the rodless chamber 11 and the rod chamber 12. When the current pressure of cavity 12 reaches the first preset value, the second connecting oil circuit 6 and the side branch oil circuit 7 are connected to the rod cavity 12; when the current pressure of the rod cavity 12 reaches the second preset value, the oil supply circuit 2 is stopped and oil return begins, wherein the second preset value is greater than the first preset value; when the outrigger cylinder 1 stops working, when the current pressure of the rodless cavity 11 and the rod cavity 12 changes abruptly, the first connecting oil circuit 5, the second connecting oil circuit 6 and the side branch oil circuit 7 are all disconnected.

[0043] In this embodiment, when the outrigger cylinder 1 is working, and the monitoring unit 4 detects that the pressure in the rod chamber 12 reaches a first preset value, both the second connecting oil circuit 6 and the side branch oil circuit 7 are connected to the rod chamber 12 to ensure effective oil return from the rod chamber 12 side, preventing cylinder expansion due to oil circuit blockage and affecting the normal operation of the outrigger cylinder 1. When the monitoring unit 4 detects that the pressure in the rod chamber 12 reaches a second preset value, the monitoring unit 4 transmits the pressure information to the safety control valve group 3. The safety control valve group 3 controls the oil supply circuit 2 to disconnect, stopping the oil supply to the outrigger cylinder 1 to prevent cylinder expansion due to oil circuit blockage. When the outrigger cylinder 1 stops working, if the monitoring unit 4 detects that the pressure in both the rod chamber 12 and the rodless chamber 11 rises sharply, it can be determined that the outrigger cylinder 1 has experienced internal leakage. At this time, the hydraulic oil in the rodless chamber 11 will gradually flow into the rod chamber 12. In response, the first connecting oil circuit 5, the second connecting oil circuit 6, and the side branch oil circuit 7 should be disconnected in a timely manner to prevent the hydraulic oil in the outrigger cylinder 1 from flowing back from the first connecting oil circuit 5 and the second connecting oil circuit 6, which could cause the outrigger cylinder 1 to have a false leg.

[0044] In this embodiment, the outrigger hydraulic control system further includes a reversing valve 8 disposed on the oil delivery circuit 2. One port of the reversing valve 8 is connected to the oil tank, and the other port is connected to the rodless chamber 11 and the rod chamber 12 of the outrigger cylinder 1. A safety control valve assembly 3 is disposed between the reversing valve 8 and the outrigger cylinder 1. The reversing valve 8 has a first switching position and a second switching position. When the reversing valve 8 switches between the first switching position and the second switching position, it can drive the outrigger to extend or retract. Figure 2 As shown, the first switching position is located on the right and the second switching position is located on the left. In this embodiment, the reversing valve 8 is selected as a three-position four-way solenoid reversing valve. The reversing valve 8 can be replaced with other types of valve bodies according to actual needs.

[0045] like Figure 2 As shown, the outrigger hydraulic control system also includes a hydraulic pump and an oil tank for pumping oil. An inlet oil passage and a return oil passage are provided between the directional valve 8 and the oil tank. The hydraulic pump is located on the inlet oil passage and is used to efficiently draw hydraulic oil from the oil tank. The directional valve 8 includes a first working port and a second working port on a first side, and a first working port and a second working port on a second side on the other side. The first working port on the first side is connected to the rodless chamber 11 via a first working oil passage 21 and a first connecting oil passage 5. The second working port on the first side is connected to the rod chamber 12 via a second working oil passage 22 and a second connecting oil passage 6.

[0046] When the outrigger needs to extend, the control reversing valve 8 is switched to the first switching position, and the hydraulic pump is started. At this time, the first working oil port on the first side and the first working oil port on the second side are connected, and the second working oil port on the first side and the second working oil port on the second side are connected. At this time, the hydraulic oil is driven by the hydraulic pump to flow along the first working oil circuit 21 through the first connecting oil circuit 5 and finally injected into the rodless chamber 11. The hydraulic oil in the rod chamber 12 flows through the second connecting oil circuit 6 through the second working oil circuit 22 for hydraulic oil return, and can finally flow back to the oil tank through the first second working oil port and the second second working oil port on the second side from the return oil circuit. Thus, the outrigger can be driven to extend.

[0047] When the outrigger needs to retract, the central controller drives the directional valve 8 to adjust to the second switching position, starting the hydraulic pump. At this time, the first working port on the first side and the second working port on the second side are connected, and the second working port on the first side and the first working port on the second side are connected. The hydraulic oil flows into the rod chamber 12 through the second working oil circuit 22 and the second connecting oil circuit 6. There is a pressure difference between the rod chamber 12 and the rodless chamber 11. Under the action of the hydraulic oil, the outrigger gradually retracts. The hydraulic oil in the rodless chamber 11 flows to the oil tank through the first connecting oil circuit 5, the first working oil circuit 21, the first working port on the first side and the second working port on the second side, and the return oil circuit. The directional valve 8 also includes a neutral switching position, which is set between the first switching position and the second switching position. When the directional valve 8 is in the neutral switching position, the oil inlet circuit and the first working oil circuit 21 are disconnected and the oil supply stops and the oil return begins. Hydraulic oil cannot be input into the rodless chamber 11 and the rod chamber 12. The second working oil circuit 22 is connected to the oil return circuit. At this time, the directional valve 8 is in the stopped working state.

[0048] like Figure 2 As shown, in this embodiment, the delivery oil circuit 2 includes a first working oil circuit 21 and a second working oil circuit 22. The safety control valve group 3 includes a first safety valve assembly 31 and a second safety valve assembly 32. The first safety valve assembly 31 is disposed on the first working oil circuit 21 and connected to the first connecting oil circuit 5. The second safety valve assembly 32 is disposed on the second working oil circuit 22 and connected to the second connecting oil circuit 6. By providing the first safety valve assembly 31, the safety control of the opening and closing of the first working oil circuit 21 and the first connecting oil circuit 5 can be realized. By providing the second safety valve assembly 32, the safety control of the opening and closing of the second working oil circuit 22 and the second connecting oil circuit 6 can be realized. According to the pressure changes of the rod chamber 12 and the rodless chamber 11, the corresponding adjustment is made, which improves the safety of the outrigger hydraulic control system. When abnormal conditions occur during the operation of the outrigger, it can be dealt with in a timely manner, and the situation of the outrigger cylinder 1 expanding or not extending is fed back to the operator.

[0049] like Figure 2 As shown, in this embodiment, the second safety valve assembly 32 includes a second locking valve 321, a second hydraulic lock 322, and a relief valve 323. A bypass oil passage 7 is provided between the second working oil passage 22 and the second connecting oil passage 6. The relief valve 323 is located on the bypass oil passage 7. The two ends of the second hydraulic lock 322 are respectively connected to the inlet and outlet of the bypass oil passage 7. The two oil ports on both sides of the second locking valve 321 are respectively connected to the reversing valve 8 and the second hydraulic lock 322. The monitoring unit 4 is further configured as follows:

[0050] When the outrigger cylinder 1 is working, if the second hydraulic lock 322 is stuck and the oil pressure in the rod chamber 12 reaches the first preset value, the overflow valve 323 is opened and the abnormal pressure information of the rod chamber 12 is sent to the central controller through the pressure sensor, reminding the operator that the second hydraulic lock 322 has malfunctioned and needs to be replaced in time to avoid damage to the outrigger cylinder 1 due to cylinder expansion.

[0051] When the outrigger cylinder 1 is working, if the second hydraulic lock 322 and the relief valve 323 are both stuck and the current pressure of the rod chamber 12 reaches the second preset value, the directional valve 8 needs to be de-energized so that the directional valve 8 is in a stopped working state and no longer supplies oil. At this time, the first working oil circuit 21 stops supplying oil and starts returning oil, and the second working oil circuit 22 is connected to the return oil circuit. At the same time, the pressure sensor will send the abnormal pressure information of the rod chamber 12 to the central controller, reminding the operator that the second hydraulic lock 322 and the relief valve 323 have both failed and need to be replaced in time.

[0052] The first hydraulic lock 312 and the second hydraulic lock 322 are both located near the outrigger cylinder 1. When hydraulic oil is added to the rod chamber 12 or the rodless chamber 11, one of the first hydraulic lock 312 and the second hydraulic lock 322 is in the open state and used for oil inlet. The first locking valve 311 is located between the first hydraulic lock 312 and the reversing valve 8, and the second locking valve 321 is located between the second hydraulic lock 322 and the reversing valve 8.

[0053] In the first embodiment, when the oil pressure in the rod chamber 12 reaches the first preset value during the operation of the outrigger, if the second hydraulic lock 322 does not jam, the hydraulic oil is still delivered to the second working oil circuit 22 through the second connecting oil circuit 6. The overflow valve 323 is set in parallel with the second hydraulic lock 322, and the side branch oil circuit 7 where the overflow valve 323 is located is used as a backup oil circuit.

[0054] In the second embodiment, during the outrigger's operation, if the second hydraulic lock 322 jams when the oil pressure in the rod chamber 12 reaches the first preset value, the rod chamber 12 cannot connect to the oil tank and cannot deliver hydraulic oil normally. Therefore, it is necessary to control the relief valve 323 to open, so that the bypass oil circuit 7 connects to the second working oil circuit 22. After the hydraulic oil passes through the bypass oil circuit 7, it continues to be delivered normally, and the pressure will return to normal, thus preventing the outrigger cylinder 1 from being damaged due to cylinder expansion.

[0055] In the third embodiment, the overflow valve 323 is opened regardless of whether the second hydraulic lock 322 is stuck during the operation of the outrigger, so that the side branch oil circuit 7 and the second connecting oil circuit 6 are both connected to the second working oil circuit 22, ensuring that the hydraulic oil can be delivered stably, with better adaptability, and effectively avoiding damage to the outrigger cylinder 1 due to cylinder expansion.

[0056] like Figure 2As shown, in this embodiment, the first safety valve assembly 31 includes a first locking valve 311 and a first hydraulic lock 312, and the monitoring unit 4 is further configured as follows:

[0057] When the outrigger cylinder 1 stops working, and the current pressure of the rodless chamber 11 and the rod chamber 12 changes abruptly, the first locking valve 311 and the second locking valve 321 are both closed.

[0058] The first locking valve 311 is normally open and only locks when the pressure in the rodless chamber 11 and the rod chamber 12 changes abruptly. When the outrigger is locked, both the rod chamber 12 and the rodless chamber 11 of the outrigger cylinder 1 are closed. If internal leakage occurs in the outrigger cylinder 1 at this time, the hydraulic oil in the rodless chamber 11 will flow into the rod chamber 12, causing the pressure-bearing surface of the outrigger cylinder 1 to switch from the original outrigger piston end face to the outrigger piston rod cross section. The reduced pressure-bearing area will cause a sharp increase in pressure in the rod chamber 12 and the rodless chamber 11 of the outrigger cylinder 1. At this time, the pressure sensor detects the pressure change and quickly feeds back to the central controller. The central controller drives the reversing valve 8 to close and controls the first locking valve 311 and the second locking valve 321 to be energized and closed, actively cutting off the hydraulic oil supply inside the vertical cylinder, ensuring that the outrigger cylinder 1 maintains an effective locking state, and avoiding a false leg caused by a decrease in the hydraulic oil in the outrigger cylinder 1. The first hydraulic lock 312 and the second hydraulic lock 322 are combined to form a hydraulic lock assembly, which can be a bidirectional hydraulic lock.

[0059] In this embodiment, both the first safety valve assembly 31 and the second safety valve assembly 32 include pressure sensors for detecting the oil pressure in the rod chamber 12 or the rodless chamber 11. These sensors can sensitively detect and compare pressure changes in the rod chamber 12 and the rodless chamber 11, ensuring that when abnormal pressure conditions occur in the rod chamber 12 and the rodless chamber 11, the sensors can promptly alert the operator to any corresponding cylinder expansion or internal leakage in the outrigger cylinder 1, thereby reducing accident losses.

[0060] In this embodiment, the rodless chamber 11 of the outrigger cylinder 1 has a first internal oil port for connecting to the first connecting oil circuit 5, and the rod chamber 12 of the outrigger cylinder 1 has a second internal oil port for connecting to the second connecting oil circuit 6. The safety control valve assembly 3 is integrated with the outrigger cylinder 1 to prevent excessive cylinder pressure from damaging the external pipeline. This embodiment also includes an outrigger cylinder pressure monitoring and management system and a central controller. The outrigger cylinder pressure monitoring and management system can monitor the pressure of each oil chamber of the outrigger cylinder 1 in real time, automatically prevent abnormal pressure from continuing to increase, and inform the user of the specific fault location. The central controller is electrically connected to the first locking valve 311, the second locking valve 321, the overflow valve 323, the first hydraulic lock 312, the second hydraulic lock 322, and the pressure sensor. Under the integration of the outrigger cylinder pressure monitoring and management system, when the pressure sensor detects different pressure changes in the rodless chamber 11 and the rod chamber 12, the central controller can adjust multiple valve groups to quickly respond to various emergencies, prevent outrigger cylinder 1 from expanding, leaking, or other malfunctions, and reduce the occurrence of outrigger damage and false outrigger accidents.

[0061] like Figure 3 As shown, in this embodiment, a hydraulic control method for outriggers is proposed and applied to the outrigger hydraulic control system described above. The outrigger hydraulic control method includes:

[0062] S10: Real-time acquisition of the current pressure of rodless chamber 11 and rod chamber 12;

[0063] S20: When the outrigger cylinder 1 is working, when the current pressure of the rod chamber 12 reaches the first preset value, control the second connecting oil circuit 6 and the side branch oil circuit 7 to connect with the rod chamber 12.

[0064] S30: When the outrigger cylinder 1 is working, when the current pressure of the rod chamber 12 reaches the second preset value, the control oil supply circuit 2 stops supplying oil and starts returning oil, wherein the second preset value is greater than the first preset value.

[0065] S40: When the outrigger cylinder 1 stops working, if the current pressure of the rodless chamber 11 and the rod chamber 12 changes abruptly, the first connecting oil circuit 5, the second connecting oil circuit 6 and the side branch oil circuit 7 are all disconnected.

[0066] like Figure 1 and Figure 2As shown, for the outrigger hydraulic control system, appropriate outrigger hydraulic control methods are required to ensure the safety of outrigger cylinder 1 during operation. When outrigger cylinder 1 is working, the current pressure information of rodless chamber 11 and rod chamber 12 needs to be obtained in real time to enable a rapid response in case of an accident involving outrigger cylinder 1. When the outrigger is fully extended and outrigger cylinder 1 is stopped, if the current pressure of rodless chamber 11 and rod chamber 12 changes abruptly, the hydraulic oil in rod chamber 12 and rodless chamber 11 will not flow back into the oil tank through the pipeline by disconnecting the first connecting oil circuit 5, the second connecting oil circuit 6, and the bypass oil circuit 7, thus preventing outrigger cylinder 1 from being inactive.

[0067] In this embodiment, the outrigger hydraulic control system includes an overflow valve 323. When the outrigger cylinder 1 is working, when the current pressure of the rod chamber 12 reaches a first preset value, the step S20 of controlling the second connecting oil circuit 6 and the bypass oil circuit 7 to connect with the rod chamber 12 includes:

[0068] When the outrigger cylinder 1 is working, when the second hydraulic lock 322 is stuck and the oil pressure in the rod chamber 12 reaches the first preset value, the overflow valve 323 is opened.

[0069] In this embodiment, this hydraulic circuit configuration ensures that at least one of the second connecting oil circuit 6 and the branch oil circuit 7 is unobstructed, guaranteeing efficient hydraulic oil delivery and preventing cylinder expansion due to poor hydraulic oil delivery. When the oil pressure in the rod chamber 12 reaches the first preset value, if the second hydraulic lock 322 becomes stuck, the central controller can drive the relief valve 323 to open, connecting the branch oil circuit 7 with the second working oil circuit 22, allowing the hydraulic oil to be delivered normally, and the pressure will return to normal. Normally, the relief valve 323 is in a closed state, switching to an open state only upon receiving a command from the central controller.

[0070] In this embodiment, the oil delivery circuit 2 includes a first working oil circuit 21. When the current pressure of the rod chamber 12 reaches a second preset value, the step S30 of controlling the oil delivery circuit 2 to stop supplying oil and start returning oil includes:

[0071] When both the second hydraulic lock 322 and the relief valve 323 are stuck and the current pressure of the rod chamber 12 reaches the second preset value, the first working oil circuit is controlled to stop oil supply and start oil return.

[0072] If, after the relief valve 323 has been open for a period of time, both the relief valve 323 and the second hydraulic lock 322 are stuck, the pressure in the rod chamber 12 will continue to rise. When the pressure sensor detects that the pressure has reached the second preset value, it will send the abnormal pressure information of the rod chamber 12 to the central controller, reminding the operator that both the second hydraulic lock 322 and the relief valve 323 have malfunctioned and need to be replaced in time. The central controller will then drive the directional valve 8 to close.

[0073] In this embodiment, step S40 includes: when the outrigger cylinder 1 stops working, when the current pressure of the rodless chamber 11 and the rod chamber 12 changes abruptly, controlling the first connecting oil circuit 5, the second connecting oil circuit 6 and the bypass oil circuit 7 to disconnect, driving the first locking valve 311 and the second locking valve 321 to open, cutting off the first working oil circuit 21 and the first connecting oil circuit 5, and cutting off the second working oil circuit 22 and the second connecting oil circuit 6, ensuring that the outrigger cylinder 1 is in an effective locking state, and avoiding the reduction of hydraulic oil in the outrigger cylinder 1, which would lead to a false leg.

[0074] In this embodiment, an engineering machine is also proposed, including the outrigger hydraulic control system described above. Since the engineering machine employs all embodiments of the outrigger hydraulic control system, it also possesses all the beneficial effects brought by the outrigger hydraulic control system or outrigger hydraulic control method, which will not be elaborated upon here. In this embodiment, the outrigger hydraulic control system is preferably applied to the outriggers of a crane. The outrigger hydraulic control system used in this embodiment effectively prevents the outrigger cylinder 1 from expanding and can quickly cut off the oil circuit when internal leakage occurs in the outrigger cylinder 1, avoiding a crane overturning accident due to a loose outrigger cylinder 1.

[0075] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic control system for outriggers, characterized in that, The outrigger hydraulic control system includes: Outrigger cylinder (1); Oil supply circuit (2) is used to supply oil to the outrigger cylinder (1); The safety control valve assembly (3) is connected to the conveying oil circuit (2). A first connecting oil circuit (5) is provided between the safety control valve assembly (3) and the rodless chamber (11) of the outrigger cylinder (1). A second connecting oil circuit (6) and a side branch oil circuit (7) are provided between the safety control valve assembly (3) and the rod chamber (12) of the outrigger cylinder (1). The monitoring unit (4) is electrically connected to the safety control valve group (3) and is configured as follows: The current pressure of the rodless chamber (11) and the rod chamber (12) is acquired in real time; When the outrigger cylinder (1) is working, when the current pressure of the rod chamber (12) reaches the first preset value, the second connecting oil passage (6) and the side branch oil passage (7) are connected to the rod chamber (12). When the current pressure of the rod chamber (12) reaches the second preset value, the oil supply circuit (2) is controlled to stop supplying oil and start returning oil, wherein the second preset value is greater than the first preset value; When the outrigger cylinder (1) stops working, and the current pressure of the rodless chamber (11) and the rod chamber (12) changes abruptly, the first connecting oil circuit (5), the second connecting oil circuit (6) and the side branch oil circuit (7) are all disconnected.

2. The outrigger hydraulic control system according to claim 1, characterized in that, The outrigger hydraulic control system also includes a reversing valve (8) located on the oil delivery circuit (2). One side of the reversing valve (8) is connected to the oil tank, and the other side is connected to the rodless chamber (11) and the rod chamber (12) of the outrigger cylinder (1). The safety control valve group (3) is located between the reversing valve (8) and the outrigger cylinder (1).

3. The outrigger hydraulic control system according to claim 2, characterized in that, The oil delivery circuit (2) includes a first working oil circuit (21) and a second working oil circuit (22). The safety control valve group (3) includes a first safety valve assembly (31) and a second safety valve assembly (32). The first safety valve assembly (31) is located on the first working oil circuit (21) and connected to the first connecting oil circuit (5). The second safety valve assembly (32) is located on the second working oil circuit (22) and connected to the second connecting oil circuit (6).

4. The outrigger hydraulic control system according to claim 3, characterized in that, The second safety valve assembly (32) includes a second locking valve (321), a second hydraulic lock (322), and a relief valve (323). A bypass oil passage (7) is provided between the second working oil passage (22) and the second connecting oil passage (6). The relief valve (323) is located on the bypass oil passage (7). The two ends of the second hydraulic lock (322) are respectively connected to the inlet and outlet ends of the bypass oil passage (7). The two oil ports on both sides of the second locking valve (321) are respectively connected to the directional valve (8) and the second hydraulic lock (322). The monitoring unit (4) is further configured as follows: When the outrigger cylinder (1) is working, when the second hydraulic lock (322) is stuck and the oil pressure in the rod chamber (12) reaches the first preset value, the overflow valve (323) is controlled to open. When the second hydraulic lock (322) and the overflow valve (323) are both stuck and the current pressure of the rod chamber (12) reaches the second preset value, the first working oil circuit (21) is controlled to stop supplying oil and start returning oil.

5. The outrigger hydraulic control system according to claim 3, characterized in that, The first safety valve assembly (31) includes a first locking valve (311) and a first hydraulic lock (312), and the monitoring unit (4) is further configured to: When the outrigger cylinder (1) stops working, and the current pressure of the rodless chamber (11) and the rod chamber (12) changes abruptly, the first locking valve (311) and the second locking valve (321) are both closed.

6. The outrigger hydraulic control system according to claim 3, characterized in that, Both the first safety valve assembly (31) and the second safety valve assembly (32) include a pressure sensor for detecting the oil pressure in the rod chamber (12) or the rodless chamber (11).

7. The outrigger hydraulic control system according to any one of claims 1 to 6, characterized in that, The safety control valve group (3) is integrated with the outrigger cylinder (1) and installed as a single unit.

8. A hydraulic control method for outriggers, characterized in that, The outrigger hydraulic control method, applied in any one of claims 1 to 7, comprises: The current pressure of the rodless chamber (11) and the rod chamber (12) is acquired in real time; When the outrigger cylinder (1) is working, when the current pressure of the rod chamber (12) reaches the first preset value, the second connecting oil passage (6) and the side branch oil passage (7) are connected to the rod chamber (12). When the current pressure of the rod chamber (12) reaches the second preset value, the oil supply circuit (2) is controlled to stop supplying oil and start returning oil, wherein the second preset value is greater than the first preset value; When the outrigger cylinder (1) stops working, and the current pressure of the rodless chamber (11) and the rod chamber (12) changes abruptly, the first connecting oil circuit (5), the second connecting oil circuit (6) and the side branch oil circuit (7) are all disconnected.

9. The outrigger hydraulic control method according to claim 8, characterized in that, The outrigger hydraulic control system includes an overflow valve (323). When the outrigger cylinder (1) is working, and the current pressure of the rod chamber (12) reaches a first preset value, the step of controlling the second connecting oil circuit (6) and the bypass oil circuit (7) to connect with the rod chamber (12) includes: When the outrigger cylinder (1) is working, when the second hydraulic lock (322) is stuck and the oil pressure in the rod chamber (12) reaches the first preset value, the overflow valve (323) is controlled to open.

10. The outrigger hydraulic control method according to claim 9, characterized in that, The oil delivery circuit (2) includes a first working oil circuit (21). When the current pressure of the rod chamber (12) reaches a second preset value, the step of controlling the oil delivery circuit (2) to stop supplying oil and start returning oil includes: When the second hydraulic lock (322) and the overflow valve (323) are both stuck and the current pressure of the rod chamber (12) reaches the second preset value, the first working oil circuit (21) is controlled to stop supplying oil and start returning oil.

11. An engineering machinery, characterized in that, Includes the outrigger hydraulic control system according to any one of claims 1 to 7.

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