Landing leg hydraulic control system and method and working machine

Abstract

The invention relates to the technical field of hydraulic control systems, in particular to a landing leg hydraulic control system and method and an operation machine. The reversing valve group is arranged on a working oil way of the supporting leg oil cylinder; a first pressure relief piece is arranged between a rodless cavity working oil way and an oil return oil way of the supporting leg oil cylinder and used for unloading when the oil pressure difference of the two ends is larger than the preset oil pressure. Two oil inlets of the second pressure relief piece are communicated with the rod cavity and the rodless cavity respectively, and an oil outlet of the second pressure relief piece is communicated with the oil return path; the controller is configured to respectively obtain hydraulic oil pressure values of the rod cavity and the rodless cavity in real time; whether the hydraulic oil pressure of the rod cavity and the rodless cavity is abnormal or not is determined; and under the condition that it is determined that the pressure of the hydraulic oil is abnormal, the pressure relief oil way where the second pressure relief piece is located is controlled to be conducted, and therefore when the pressure of the supporting leg hydraulic system is abnormal, quick response can be achieved, and pressure relief protection is conducted on the supporting leg hydraulic control system.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control systems, and particularly relates to a outrigger hydraulic control system, method and working machine. Background Art

[0002] The main functions of the outriggers of a crane are to fix the vehicle body, balance the center of gravity, increase the stability and safety during use. Before operation, the operator lowers the outriggers. By contacting the ground, the vehicle body is kept flat to fix the position of the crane, avoiding jitter or movement of the vehicle body during operation and ensuring work safety. Since the crane lifts heavy objects, if the center of gravity is not evenly distributed on the vehicle, it will cause problems such as jitter and tilt of the vehicle body.

[0003] In the prior art, most outriggers are controlled by a hydraulic control system. However, the existing hydraulic control systems for outrigger control are not mature. Especially when there is a blockage in the pipeline of the hydraulic control system, it is easy to cause abnormal pressure on the upper part of the hydraulic cylinder, which not only easily causes irreversible deformation of the hydraulic cylinder, but also may lead to serious safety accidents due to overpressure. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide an outrigger hydraulic control system, method and working machine to solve the technical problem that it is difficult to relieve pressure urgently when the pressure of the outrigger hydraulic control system is abnormal in the prior art.

[0005] To achieve the above purpose, in the first aspect of the present invention, an outrigger hydraulic control system is provided. The outrigger hydraulic control system includes:

[0006] Outrigger cylinders;

[0007] A reversing valve group, arranged on the working oil circuit of the outrigger cylinder;

[0008] An oil inlet circuit and an oil return circuit. The oil inlet and oil return ports of the reversing valve group are respectively connected to the oil inlet circuit and the oil return circuit. A first pressure relief member is arranged between the rodless cavity working oil circuit of the outrigger cylinder and the oil return circuit. The first pressure relief member is used to unload when the oil pressure in the rodless cavity working oil circuit is greater than the preset oil pressure;

[0009] A second pressure relief member. Two oil inlet ports of the second pressure relief member are respectively connected to the rod cavity and the rodless cavity, and the oil outlet of the second pressure relief member is connected to the oil return circuit;

[0010] A controller, communicatively connected to the second pressure relief member. The controller is configured to: respectively and real-time obtain the hydraulic oil pressure values of the rod cavity and the rodless cavity; determine whether there is an abnormality in the hydraulic oil pressure of the rod cavity and the rodless cavity according to multiple hydraulic oil pressure values; and control the pressure relief oil circuit where the second pressure relief member is located to conduct when it is determined that the hydraulic oil pressure is abnormal.

[0011] In an embodiment of the present invention, the second pressure relief member includes: a shuttle valve, the shuttle valve includes an oil outlet and two oil inlets, the two oil inlets of the shuttle valve are respectively communicated with the rod chamber and the rodless chamber, and the oil outlet of the shuttle valve is communicated with the oil return circuit; a switching valve, the switching valve is arranged on the oil circuit between the oil outlet of the shuttle valve and the oil return circuit.

[0012] In an embodiment of the present invention, the directional valve group includes: an electromagnetic directional valve, which includes an electromagnetic directional valve oil inlet, an electromagnetic directional valve oil return port, a first working oil port and a second working oil port, the first working oil port is communicated with the rod chamber, the second working oil port is communicated with the rodless chamber, the electromagnetic directional valve oil inlet is communicated with the oil inlet circuit, and the electromagnetic directional valve oil return port is communicated with the oil return circuit.

[0013] In a second aspect of the present invention, a leg hydraulic control method is provided, which is applied to the above-mentioned leg hydraulic control system. The leg hydraulic control method includes: respectively and real-time obtaining the hydraulic oil pressure values of the rod chamber and the rodless chamber; determining whether there is an abnormality in the hydraulic oil pressure of the rod chamber and the rodless chamber according to a plurality of hydraulic oil pressure values; and when it is determined that there is an abnormality in the hydraulic oil pressure, controlling the pressure relief oil circuit where the second pressure relief member is located to be conducted.

[0014] In an embodiment of the present invention, the step of determining whether there is an abnormality in the hydraulic oil pressure in the rod chamber and the rodless chamber according to a plurality of hydraulic oil pressure values includes: determining the normal working pressure range values of the rod chamber and the rodless chamber; and when the hydraulic oil pressure in the rod chamber and / or the rodless chamber exceeds the normal working pressure range value, determining that there is an abnormality in the hydraulic oil pressure.

[0015] In an embodiment of the present invention, the step of determining whether there is an abnormality in the hydraulic oil pressure in the rod chamber and the rodless chamber according to a plurality of hydraulic oil pressure values includes: determining the normal working pressure difference range between the rod chamber and the rodless chamber; and when the pressure difference between the rod chamber and the rodless chamber exceeds the normal working pressure difference range, determining that there is an abnormality in the hydraulic oil pressure.

[0016] In an embodiment of the present invention, the leg hydraulic control method further includes: when it is determined that the leg cylinder needs to unload, controlling the second pressure relief member to open.

[0017] In an embodiment of the present invention, the second pressure relief member includes a shuttle valve and a switching valve. The two oil inlets of the shuttle valve are respectively communicated with the rodless chamber and the rod chamber, the oil outlet of the shuttle valve is communicated with the oil return circuit, and the switching valve is arranged on the oil circuit between the oil outlet of the shuttle valve and the oil return circuit. When it is determined that there is an abnormality in the hydraulic oil pressure in the leg cylinder, the step of controlling the second pressure relief member to be conducted includes: controlling the switching valve to be conducted, so that the hydraulic oil exceeding the normal oil pressure in the rodless chamber and / or the rod chamber returns to the oil return circuit through the switching valve for unloading; during the unloading process, real-time obtaining the current oil pressures of the rodless chamber and the rod chamber; and when the current oil pressures of the rodless chamber and the rod chamber are both within the normal range, controlling the switching valve to be cut off.

[0018] In an embodiment of the present invention, the outrigger hydraulic control system further includes an alarm, and the outrigger hydraulic control method further includes: when the hydraulic oil pressure in the rodless cavity and / or the rod cavity is abnormal, controlling the alarm to give an alarm.

[0019] The third aspect of the present invention provides a working machine, including the above-mentioned outrigger hydraulic control system.

[0020] In the above technical solution, the outrigger hydraulic control system includes an outrigger cylinder, a reversing valve group, an oil inlet circuit, an oil return circuit, a second pressure relief component, and a controller. A first pressure relief component is arranged between the working oil circuit of the rodless cavity of the outrigger cylinder and the oil return circuit. The first pressure relief component is used to unload when the oil pressure in the working oil circuit of the rodless cavity is greater than the preset oil pressure, so as to ensure that the pressure difference between both ends of the outrigger cylinder remains stable, and relieve the abnormal high pressure in the rodless cavity. The reversing valve group is arranged on the working oil circuit of the outrigger cylinder. The oil inlet circuit and the oil return circuit are respectively communicated with the oil inlet and the oil return port of the reversing valve group. The controller can determine whether the hydraulic oil pressure in the outrigger cylinder is abnormal according to multiple hydraulic oil pressure values. If there is an abnormal situation, the controller can control the pressure relief oil circuit where the second pressure relief component is located to conduct, so as to relieve the pressure of the outrigger cylinder. By adopting the above outrigger control system, the pressure at both ends of the outrigger cylinder can be controlled and relieved through two pressure relief components, ensuring the stability and safety of the outriggers during operation. Among them, the first pressure relief component mainly responds quickly to the abnormal high pressure in the rodless cavity, while the second pressure relief component realizes more precise and flexible pressure control by the controller's real-time monitoring and abnormal judgment of the pressures in the rod cavity and the rodless cavity, thereby protecting the outrigger cylinder from damage.

[0021] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification. Together with the following specific implementation manners, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0023] Figure 1 is a hydraulic schematic diagram of the outrigger hydraulic control system provided according to an embodiment of the present invention;

[0024] Figure 2 is a flowchart of the outrigger hydraulic control method provided according to an embodiment of the present invention.

[0025] DESCRIPTION OF REFERENCE NUMERALS

[0026] 11 Horizontal cylinder

[0027] 12 Vertical cylinder

[0028] 20-way directional valve group

[0029] 21 electromagnetic directional valve

[0030] 22 first pressure relief component

[0031] 31 pressure detection component

[0032] 41 shuttle valve

[0033] 42 switching valve

[0034] 50 hydraulic lock

[0035] L1 inlet oil circuit

[0036] L2 return oil circuit

[0037] L3 rod chamber working oil circuit

[0038] L4 rodless chamber working oil circuit

[0039] L5 pressure relief oil circuit Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be understood that the specific implementation manners described herein are only for explaining and interpreting the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0041] It should be noted that the acquisition, transmission, storage, use, processing, etc. of data in the technical solutions of the present invention all comply with the relevant provisions of national laws and regulations. In the embodiments of the present invention, some existing solutions in the industry such as certain software, components, models, etc. may be mentioned. They should be regarded as exemplary, and their purpose is only to illustrate the feasibility in the implementation of the technical solutions of the present invention, but it does not mean that the applicant has already or necessarily used this solution.

[0042] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] As Figure 1 shown, it is a hydraulic schematic diagram of a outrigger hydraulic control system provided according to an embodiment of the present invention. The outrigger hydraulic control system includes:

[0045] Outrigger cylinders;

[0046] A reversing valve group 20, which is arranged on the working oil path of the outrigger cylinder;

[0047] An oil inlet oil path L1 and an oil return oil path L2. The oil inlet and oil return ports of the reversing valve group 20 are respectively communicated with the oil inlet oil path L1 and the oil return oil path L2. A first pressure relief member 22 is arranged between the rodless cavity working oil path L4 of the outrigger cylinder and the oil return oil path L2. The first pressure relief member 22 is used for unloading when the oil pressure in the rodless cavity working oil path L4 is greater than a preset oil pressure;

[0048] A second pressure relief member. The two oil inlet ports of the second pressure relief member are respectively communicated with the rod cavity and the rodless cavity, and the oil outlet of the second pressure relief member is communicated with the oil return oil path L2;

[0049] A controller, which is communicatively connected to the second pressure relief member. The controller is configured to: respectively and real-time obtain the hydraulic oil pressure values of the rod cavity and the rodless cavity; determine whether there is an abnormality in the hydraulic oil pressure of the rod cavity and the rodless cavity according to a plurality of hydraulic oil pressure values; and control the pressure relief oil path L5 where the second pressure relief member is located to be conducted when it is determined that there is an abnormality in the hydraulic oil pressure.

[0050] Operating machinery such as cranes and concrete pump trucks usually have outriggers to ensure balance during high-load operations. The extension and retraction of the outriggers are usually driven by a hydraulic control system. The outrigger hydraulic system provided by the embodiments of the present invention can drive the horizontal cylinder 11 and / or the vertical cylinder 12 of the outrigger to extend and retract. The directional valve group 20 can perform a directional operation to change the working oil circuit into which the input hydraulic oil is input, thereby changing the movement direction of the outrigger cylinder. The pressure detection component can detect the hydraulic oil pressure values of the rod chamber and the rodless chamber in real time and send a control signal of the hydraulic oil pressure value to the controller. The second pressure relief member includes two oil inlets and one oil outlet. The oil outlet of the second pressure relief member is communicated with the oil return circuit L2. When the second pressure relief member is in a conducting state, the pressure relief circuit L5 where the second pressure relief member is located is conducted.

[0051] The outrigger hydraulic control system further includes a pressure detection component for detecting the hydraulic oil pressure of the rod chamber and the rodless chamber. When the outrigger is performing work, the controller needs to obtain in real time the multiple hydraulic oil pressure values detected by the pressure detection component. Based on the multiple hydraulic oil pressure values, it can be determined whether there is an abnormality in the hydraulic oil pressure in the outrigger cylinder. For example, if the hydraulic oil pressure in the outrigger cylinder exceeds the preset normal range, it indicates that there is an abnormal condition. At this time, the controller will respond quickly and send a control signal to the second pressure relief member to conduct the pressure relief circuit L5, so as to discharge the hydraulic oil exceeding the normal pressure through the oil return circuit L2, realizing the rapid pressure relief of the outrigger cylinder. This process not only effectively prevents the outrigger cylinder from being damaged due to excessive hydraulic oil pressure, but also ensures the stability and safety of the crane during operation. By monitoring and adjusting the hydraulic oil pressure in real time, the outrigger hydraulic control system provided by the embodiments of the present invention can significantly improve the overall performance and reliability of the operating machinery.

[0052] In addition, the first pressure relief member 22 can unload when the oil pressure in the rodless chamber working oil circuit L4 of the outrigger cylinder is greater than the preset oil pressure, and can unload when the pressure difference is abnormal, preventing the outrigger cylinder from being damaged due to excessive oil pressure. And the pressure of the oil return circuit L2 is relatively stable. The setting of the first pressure relief member 22 can ensure the stability of the pressure difference between the rodless chamber working oil circuit L4 and the oil return circuit L2, ensuring the stable operation of the outrigger cylinder. In a specific embodiment, the first pressure relief member 22 is a relief valve.

[0053] The outrigger hydraulic control system provided by the embodiment of the present invention includes two pressure relief components, which can perform more accurate and flexible pressure control and pressure relief on both ends of the outrigger cylinder. Among them, the first pressure relief component 22 mainly responds quickly to the abnormal high pressure in the rodless cavity to ensure timely pressure relief when the pressure in the rodless cavity is abnormal and prevent damage to the outrigger cylinder. The second pressure relief component monitors the pressures in the rod chamber and the rodless cavity in real time through the controller. Once abnormal pressure is detected, the controller immediately controls the second pressure relief component to conduct the pressure relief oil circuit L5, and discharges the hydraulic oil with abnormal high pressure through the oil return circuit L2, thereby realizing precise control of the outrigger cylinder. This design not only improves the stability and safety of the outrigger hydraulic control system, but also effectively extends the service life of the outrigger cylinder. At the same time, the outrigger hydraulic control system provided by the embodiment of the present invention has a simple structure, is easy to maintain and operate, reduces the use cost, and has high practical value.

[0054] In a specific embodiment, as Figure 1 shown, the number of outrigger cylinders is two, namely a horizontal cylinder 11 and a vertical cylinder 12. The reversing valve group 20 includes two electromagnetic reversing valves 21. The number of pressure detection components and the second pressure relief components are both two. The oil inlet circuit L1 can respectively supply high-pressure hydraulic oil to the oil inlets of the two electromagnetic reversing valves 21. The hydraulic oil at the oil outlets of the two electromagnetic reversing valves 21 can converge into the oil return circuit L2 and then flow into the hydraulic oil tank. Adopting the structure as Figure 1 shown, the two horizontal cylinders 11 and the vertical cylinder 12 act independently without interference, and can respectively realize the support of the crane in the horizontal direction and the vertical direction, improving the flexibility and stability of the crane operation. At the same time, each outrigger cylinder is equipped with an independent electromagnetic reversing valve 21, a pressure detection component and a second pressure relief component, ensuring precise control and safety protection of the hydraulic control system. During the operation process, the controller can obtain the hydraulic oil pressure value of each outrigger cylinder in real time and make judgments and processes according to the preset algorithm logic. Once it is found that the hydraulic oil pressure of a certain outrigger cylinder is abnormal, the controller will immediately start the corresponding pressure relief program, and relieve the hydraulic oil with too high pressure through the second pressure relief component to the oil return circuit L2, thereby effectively avoiding safety hazards such as damage to the outrigger cylinder or instability of the crane caused by too high hydraulic oil pressure.

[0055] In a specific embodiment, hydraulic locks 50 are also connected to the two working oil circuits communicating with the vertical cylinder 12, which can accurately position and keep the vertical cylinder 12 stationary after reaching the specified position, preventing the position of the cylinder from changing due to external forces, hydraulic system leakage and other factors. However, the setting of the hydraulic lock 50 is more likely to cause blockage of the working oil circuit. The embodiment of the present invention sets a second pressure relief component, which can immediately relieve the pressure of the hydraulic oil in the vertical cylinder 12 when a working oil circuit is blocked to protect the vertical cylinder 12 and the two working oil circuits communicating with the vertical cylinder 12.

[0056] In a specific embodiment, the directional valve group 20 includes a first working oil port and a second working oil port. The first working oil port is communicated with the rod chamber through the rod chamber working oil path L3, and the second working oil port is communicated with the rodless chamber through the rodless chamber working oil path L4. The pressure detection assembly includes two pressure detection elements 31, and the two pressure detection elements 31 respectively detect the hydraulic oil pressure of the two working oil paths, thereby indirectly detecting the hydraulic oil pressure in the rod chamber and the rodless chamber.

[0057] In one embodiment, as Figure 1 shown, the second pressure relief member includes: a shuttle valve 41 and a switching valve 42. The shuttle valve 41 includes an oil outlet and two oil inlets. The two oil inlets of the shuttle valve 41 are respectively communicated with the rod chamber and the rodless chamber. The oil outlet of the shuttle valve 41 is communicated with the return oil path L2. The switching valve 42 is arranged on the oil path between the oil outlet of the shuttle valve 41 and the return oil path L2. The shuttle valve 41 is a hydraulic component with two oil inlets and one oil outlet. When the hydraulic oil pressure of any one of the two oil inlets is higher than the other, the oil outlet of the shuttle valve 41 will be communicated with the oil inlet with higher pressure.

[0058] In the embodiment of the present invention, the two oil inlets of the shuttle valve 41 are respectively communicated with the rod chamber and the rodless chamber, and the oil outlet of the shuttle valve 41 is communicated with the return oil path L2. When the hydraulic oil pressure in the rod chamber or the rodless chamber of the outrigger cylinder is too high, the shuttle valve 41 can communicate the hydraulic oil chamber with higher pressure with the return oil path L2 to achieve preliminary pressure relief. The switching valve 42 is arranged on the oil path between the oil outlet of the shuttle valve 41 and the return oil path L2 and is used to control the on-off of the pressure relief oil path L5. When the controller determines that the hydraulic oil pressure in the outrigger cylinder is abnormal, it will control the switching valve 42 to open, so that the high-pressure hydraulic oil discharged by the shuttle valve 41 can flow back to the hydraulic oil tank smoothly, realizing the rapid pressure relief of the outrigger cylinder. Through the cooperation of the shuttle valve 41 and the switching valve 42, the second pressure relief member provided by the embodiment of the present invention can effectively monitor and adjust the hydraulic oil pressure of the outrigger cylinder, ensuring the stability and safety of the working machine. In a specific embodiment, the switching valve 42 is an electromagnetic switching valve 42, and the working position of the switching valve 42 is switched by controlling the energization and de-energization of the electromagnet.

[0059] In one embodiment, as Figure 1 shown, the directional valve group 20 further includes: an electromagnetic directional valve 21 includes an electromagnetic directional valve oil inlet, an electromagnetic directional valve oil return port, a first working oil port and a second working oil port. The first working oil port is communicated with the rod chamber, the second working oil port is communicated with the rodless chamber, the electromagnetic directional valve oil inlet is communicated with the oil inlet path L1, and the electromagnetic directional valve oil return port is communicated with the return oil path L2. The electromagnetic directional valve 21 can switch the hydraulic oil to different working oil paths according to the instructions of the controller, thereby changing the movement direction of the outrigger cylinder.

[0060] In a specific embodiment, as Figure 1 shown, the outrigger hydraulic control system includes two electromagnetic directional control valves 21. One electromagnetic directional control valve 21 controls the movement of the horizontal cylinder 11, and the other electromagnetic directional control valve 21 controls the movement of the vertical cylinder 12. The electromagnetic directional control valves 21 are all three-position four-way directional control valves, and the three working positions respectively correspond to the extension of the outrigger cylinder, the stop of the outrigger cylinder, and the contraction of the outrigger cylinder. In the first working position, the oil inlet of the electromagnetic directional control valve is communicated with the second working oil port, and the oil outlet of the electromagnetic directional control valve 21 is communicated with the first working oil port; in the third working position, the oil inlet of the electromagnetic directional control valve is communicated with the first working oil port, and the oil outlet of the electromagnetic directional control valve 21 is communicated with the second working oil port. In the second working position, the four oil ports of one of the electromagnetic directional control valves 21 are cut off from each other, and the two working oil ports and the oil return port of the other electromagnetic directional control valve 21 are communicated with each other to facilitate the oil return of the hydraulic oil of the vertical cylinder 12.

[0061] In one embodiment, as Figure 2 shown, it is a flowchart of the outrigger hydraulic control method provided according to the embodiment of the present invention. The outrigger hydraulic control method is applied to the above-mentioned outrigger hydraulic control system. The outrigger hydraulic control method includes:

[0062] S101, respectively and real-time obtain the hydraulic oil pressure values of the rod chamber and the non-rod chamber.

[0063] S102, determine whether there is an abnormality in the hydraulic oil pressure of the rod chamber and the non-rod chamber according to multiple hydraulic oil pressure values.

[0064] S103, when it is determined that there is an abnormality in the hydraulic oil pressure, control the pressure relief oil circuit L5 where the second pressure relief member is located to be conducted.

[0065] By adopting the above control method, the real-time monitoring and rapid response of the hydraulic oil pressure of the outrigger cylinder can be realized, effectively improving the stability and safety of the working machine. Once an abnormality in the hydraulic oil pressure is found, the controller immediately starts the pressure relief program, controls the second pressure relief member to be conducted, and discharges the excessive hydraulic oil pressure through the oil return oil circuit L2, thereby realizing the rapid pressure relief of the outrigger cylinder. This process not only prevents the damage of the outrigger cylinder caused by excessive hydraulic oil pressure, but also ensures the smooth operation of the crane during the operation process.

[0066] In one embodiment, the steps of determining whether there is an abnormality in the hydraulic oil pressure in the rod chamber and the non-rod chamber based on multiple hydraulic oil pressure values include: determining the normal operating pressure range values of the rod chamber and the non-rod chamber; and determining that there is an abnormality in the hydraulic oil pressure when the hydraulic oil pressure in the rod chamber and / or the non-rod chamber exceeds the normal operating pressure range value. When the controller determines whether there is an abnormality in the hydraulic oil pressure in the non-rod chamber and the rod chamber, it will preset a normal operating pressure range value in advance. This range value is comprehensively determined based on various factors such as the design parameters of the outrigger cylinder, the working requirements of the construction machinery, and the performance of the hydraulic oil. During the actual operation process, the controller will obtain in real time the hydraulic oil pressure values of the rod chamber and the non-rod chamber detected by the pressure detection component, and compare these values with the preset normal operating pressure range value. If the detected hydraulic oil pressure value exceeds the preset normal range, whether it is higher than the upper limit value or lower than the lower limit value, the controller will determine that the hydraulic oil pressure is abnormal.

[0067] For example, when the outrigger cylinder is under high load, if the hydraulic oil pressure suddenly rises and exceeds the normal range, this may mean that there is a fault inside the outrigger cylinder, or a certain component in the hydraulic control system fails, resulting in abnormal pressure regulation. Similarly, if the hydraulic oil pressure is too low, it may also affect the telescopic performance of the outrigger cylinder and the stability of the construction machinery.

[0068] In one embodiment, the steps of determining whether there is an abnormality in the hydraulic oil pressure in the rod chamber and the non-rod chamber based on multiple hydraulic oil pressure values include: determining the normal operating pressure difference range between the rod chamber and the non-rod chamber; and determining that there is an abnormality in the hydraulic oil pressure when the pressure difference between the rod chamber and the non-rod chamber exceeds the normal operating pressure difference range. When the controller determines whether there is an abnormality in the hydraulic oil pressure in the non-rod chamber and the rod chamber, it can also consider whether the pressure difference between them is within the normal range. This pressure difference range is also comprehensively determined based on factors such as the design parameters of the outrigger cylinder, the working requirements of the construction machinery, and the performance of the hydraulic oil. During the actual operation process, since the loads and pressures generated by the rod chamber and the non-rod chamber of the outrigger cylinder are often different during operation, the pressure difference between them is an important monitoring index. If the detected pressure difference between the rod chamber and the non-rod chamber exceeds the preset normal range, whether the positive difference exceeds or the negative difference exceeds, the controller will determine that the hydraulic oil pressure is abnormal. Such an abnormality in the pressure difference may mean that there is a problem with the internal structure of the outrigger cylinder, or a certain component in the hydraulic control system has failed, resulting in abnormal pressure balance regulation. By monitoring the pressure difference between the rod chamber and the non-rod chamber, potential fault hazards can be detected in a timely manner to ensure the stability and safety of the construction machinery.

[0069] In one embodiment, the outrigger hydraulic control method further includes: when it is determined that the outrigger cylinder needs to unload, controlling the second pressure relief member to open. When the outrigger cylinder switches to the stop state or needs to be disassembled, it is necessary to unload the hydraulic oil to prevent the hydraulic oil from accumulating in the outrigger cylinder and generating excessive pressure, thereby damaging the cylinder or affecting the safety of the working machine. At this time, the controller will judge whether the outrigger cylinder needs to unload. If so, it will control the second pressure relief member to open, so that the hydraulic oil can flow back to the hydraulic oil tank through the pressure relief oil circuit L5 to achieve the unloading operation. This process ensures that when the outrigger cylinder stops working or is disassembled, the internal pressure can be released in time, avoiding potential safety hazards caused by pressure accumulation.

[0070] In one embodiment, the second pressure relief member includes a shuttle valve 41 and a switching valve 42. The two oil inlets of the shuttle valve 41 are respectively communicated with the rodless chamber and the rod chamber. The oil outlet of the shuttle valve 41 is communicated with the oil return oil circuit L2. The switching valve 42 is arranged on the oil circuit between the oil outlet of the shuttle valve 41 and the oil return oil circuit L2. When it is determined that the hydraulic oil pressure in the outrigger cylinder is abnormal, the step of controlling the second pressure relief member to conduct includes: controlling the switching valve 42 to conduct, so that the hydraulic oil exceeding the normal oil pressure in the rodless chamber and / or the rod chamber returns to the oil return oil circuit L2 through the switching valve 42 for unloading; during the unloading process, the current oil pressures of the rodless chamber and the rod chamber are obtained in real time; when the current oil pressures of the rodless chamber and the rod chamber are both within the normal range, controlling the switching valve 42 to cut off. When controlling the second pressure relief member to conduct to unload the hydraulic oil in the hydraulic cylinder, it is also necessary to finely control the pressure relief process to ensure the smoothness and safety of the unloading operation. Specifically, when the controller determines that the hydraulic oil pressure in the outrigger cylinder is abnormal or needs to unload, it will first control the switching valve 42 to conduct. The hydraulic oil exceeding the normal oil pressure in the rodless chamber and / or the rod chamber will pass through the shuttle valve 41 and the switching valve 42 and finally return to the oil return oil circuit L2 for unloading. During the unloading process, the controller will continuously obtain the current oil pressure data of the rodless chamber and the rod chamber sent by the pressure detection component to prevent insufficient pressure relief or excessive pressure relief. When the controller detects that the current oil pressures of the rodless chamber and the rod chamber both drop to the normal range, it will immediately control the switching valve 42 to cut off, thereby ending the pressure relief process. This process not only ensures the accuracy and safety of the pressure relief operation, but also effectively prevents damage to the outrigger cylinder or the working machine caused by improper pressure relief.

[0071] In one embodiment, the outrigger hydraulic control system further includes a warning device. The outrigger hydraulic control method further includes: when the hydraulic oil pressure in the rod chamber and / or the rodless chamber is abnormal, controlling the warning device to give a warning to remind the operator to pay attention and take corresponding measures. The setting of the warning device can further improve the safety performance of the working machine, ensure that when the hydraulic oil pressure is abnormal, the operator can discover and handle it in time, thereby avoiding potential safety hazards.

[0072] Specifically, the warning device can use various methods such as sound, light, and electricity for alarming, so as to effectively remind the operator in different working environments. For example, in a noisy working site, flashing lights can be used as an alarm signal; in a dim environment, a sound alarm function can be added to ensure that the operator can clearly receive the alarm information. Through the setting of the warning device, the outrigger hydraulic control system provided by the embodiment of the present invention can timely remind the operator to pay attention when the hydraulic oil pressure is abnormal, thereby ensuring the stability and safety of the working machine.

[0073] In one embodiment, a working machine is provided, including the above-mentioned outrigger hydraulic control system.

[0074] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0075] The present invention is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the controller of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the controller of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0076] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implement the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0077] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide for implementing the steps in a process Figure 1 one process or multiple processes and / or blocks Figure 1 steps of the functions specified in one block or multiple blocks.

[0078] In a typical configuration, a computing device includes one or more controllers (CPUs), an input / output interface, a network interface, and memory.

[0079] The memory may include non-permanent memory in the computer-readable medium, in the form of random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

[0080] Computer-readable media includes permanent and non-permanent, removable and non-removable media and can store information by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0081] It should also be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the element.

[0082] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A hydraulic control system for an outrigger, characterized in that: include: Outrigger cylinder; A reversing valve group (20) is arranged on the working oil circuit of the outrigger oil cylinder; An oil inlet circuit (L1) and an oil return circuit (L2), the oil inlet and the oil return of the reversing valve group (20) are respectively connected to the oil inlet circuit (L1) and the oil return circuit (L2), a first pressure relief member (22) is provided between the rodless chamber working oil circuit (L4) of the outrigger oil cylinder and the oil return circuit (L2), the first pressure relief member (22) being used for unloading when the oil pressure of the rodless chamber working oil circuit (L4) is greater than a preset oil pressure; a second pressure relief member, wherein two oil inlets of the second pressure relief member are respectively connected to the rod chamber and the rodless chamber, and an oil outlet of the second pressure relief member is connected to the oil return path (L2); A controller is communicatively connected to the second pressure relief member, and the controller is configured to: respectively obtaining the hydraulic oil pressure values ​​of the rod chamber and the rodless chamber in real time; Determining whether the hydraulic oil pressures of the rod chamber and the rodless chamber are abnormal based on the plurality of hydraulic oil pressure values; When it is determined that the hydraulic oil pressure is abnormal, the pressure relief oil circuit (L5) where the second pressure relief member is located is controlled to be open.

2. The outrigger hydraulic control system according to claim 1, characterized in that: The second pressure relief member comprises: A shuttle valve (41), the shuttle valve (41) comprising an oil outlet and two oil inlets, the two oil inlets of the shuttle valve (41) being respectively connected to the rod chamber and the rodless chamber, and the oil outlet of the shuttle valve (41) being connected to an oil return line (L2); A switch valve (42) is provided on the oil circuit between the oil outlet of the shuttle valve (41) and the oil return circuit (L2).

3. The outrigger hydraulic control system according to claim 1, characterized in that: The reversing valve group (20) comprises: The electromagnetic reversing valve (21) comprises an electromagnetic reversing valve oil inlet, an electromagnetic reversing valve oil return port, a first working oil port and a second working oil port, wherein the first working oil port is connected to a rod chamber, the second working oil port is connected to the rodless chamber, the electromagnetic reversing valve oil inlet is connected to the oil inlet circuit (L1), and the electromagnetic reversing valve oil return port is connected to the oil return circuit (L2).

4. A method for controlling hydraulic pressure of an outrigger, characterized in that: Applicable to the outrigger hydraulic control system according to any one of claims 1 to 3, the outrigger hydraulic control method comprising: respectively obtaining the hydraulic oil pressure values ​​of the rod chamber and the rodless chamber in real time; Determining whether the hydraulic oil pressures of the rod chamber and the rodless chamber are abnormal based on the plurality of hydraulic oil pressure values; When it is determined that the hydraulic oil pressure is abnormal, the pressure relief oil circuit (L5) where the second pressure relief member is located is controlled to be open.

5. The outrigger hydraulic control method according to claim 4, characterized in that: The step of determining whether the hydraulic oil pressure in the rod chamber and the rodless chamber is abnormal according to the plurality of hydraulic oil pressure values ​​comprises: Determine the normal working pressure range values ​​of the rod chamber and the rodless chamber; When the hydraulic oil pressure of the rod chamber and / or the rodless chamber exceeds the normal working pressure range value, it is determined that the hydraulic oil pressure is abnormal.

6. The outrigger hydraulic control method according to claim 4, characterized in that: The step of determining whether the hydraulic oil pressure in the rod chamber and the rodless chamber is abnormal according to the plurality of hydraulic oil pressure values ​​comprises: Determine a normal operating pressure difference range between the rod chamber and the rodless chamber; In the case where the pressure difference between the rod chamber and the rodless chamber exceeds the normal operating pressure difference range, it is determined that there is an abnormality in the hydraulic oil pressure.

7. The outrigger hydraulic control method according to claim 4, characterized in that: The outrigger hydraulic control method further comprises: When it is determined that the outrigger oil cylinder needs to be unloaded, the second pressure relief member is controlled to open.

8. The outrigger hydraulic control method according to claim 4, characterized in that: The second pressure relief component comprises a shuttle valve (41) and a switch valve (42), the two oil inlets of the shuttle valve (41) are respectively connected to the rodless chamber and the rod chamber, the oil outlet of the shuttle valve (41) is connected to the oil return line (L2), and the switch valve (42) is arranged on the oil line between the oil outlet of the shuttle valve (41) and the oil return line (L2). When it is determined that the hydraulic oil pressure in the outrigger oil cylinder is abnormal, the step of controlling the conduction of the second pressure relief component comprises: Controlling the on-off valve (42) to be turned on, so that the hydraulic oil exceeding the normal oil pressure in the rodless chamber and / or the rod chamber is returned to the oil return line (L2) through the on-off valve (42) for unloading; During the unloading process, the current oil pressure of the rodless chamber and the rod chamber is obtained in real time; When the current oil pressures of the rodless chamber and the rod chamber are both within the normal range, the switch valve (42) is controlled to be cut off.

9. The outrigger hydraulic control method according to claim 4, characterized in that: The outrigger hydraulic control system further includes an alarm, and the outrigger hydraulic control method further includes: When there is an abnormality in the hydraulic oil pressure of the rod chamber and / or the rodless chamber, the alarm device is controlled to issue an alarm.

10. A working machine, characterized in that: include: The outrigger hydraulic control system according to any one of claims 1 to 3.

Images