Landing leg control system and working machine

Abstract

The invention relates to the field of hydraulic systems, and discloses a supporting leg control system and an operation machine. The landing leg control system comprises a telescopic selection valve, a first hydraulic cylinder and a second hydraulic cylinder, the first control valve is connected with the first working oil port, a rodless cavity of the first supporting leg horizontal oil cylinder and a rodless cavity of the first supporting leg vertical oil cylinder, and a rod cavity of the first supporting leg horizontal oil cylinder and a rod cavity of the first supporting leg vertical oil cylinder are both connected with the second working oil port; the second control valve is respectively connected with the first working oil port and a rodless cavity of the second supporting leg vertical oil cylinder, and a rod cavity of the second supporting leg vertical oil cylinder is connected with the second working oil port; when the second control valve is in a normal state, the rodless cavity of the second supporting leg vertical oil cylinder returns oil; and when the second control valve is in the first working position, the second supporting leg vertical oil cylinder is communicated with the first working oil port. The second supporting leg vertical oil cylinder can retract along with retraction of the first supporting leg horizontal oil cylinder or the first supporting leg vertical oil cylinder, and active operation is not needed.

Description

Technical Field

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

[0002] With the development of the manufacturing technology of engineering machinery equipment, the market demand for cranes is no longer limited to basic performance, and higher requirements are put forward in terms of reliability, controllability, safety, etc.

[0003] In order to improve the safety during the hoisting operation, most current crane products are provided with outriggers not only on both sides of the vehicle body, but also at the bottom of the cab. This design can effectively increase the support area and stability of the crane, and reduce the risk of tipping over during the operation of the crane.

[0004] However, when the crane is retracted, according to the regulations, the outriggers at the bottom of the cab should be retracted first, and then the other outriggers. However, due to the cab layout and vision limitations, when the user operates the outrigger handle, they cannot observe the outriggers at the bottom of the cab, and often forget to retract them and directly retract the other outriggers. This causes the outriggers at the bottom of the cab to be easily bent when the crane starts to drive, which not only damages the equipment, increases the maintenance cost, but also may cause safety accidents. Summary of the Invention

[0005] In view of this, the present invention provides an outrigger control system and a working machine to solve or improve the problem that the outriggers at the bottom of the cab are easily overlooked and retracted.

[0006] In a first aspect, the present invention provides an outrigger control system, including:

[0007] A telescopic selection valve, having a main oil inlet, a main oil return port, a first working oil port and a second working oil port;

[0008] A first control valve, which is respectively connected to the first working oil port, the rodless cavity of the first outrigger horizontal oil cylinder and the rodless cavity of the first outrigger vertical oil cylinder. The rod chamber of the first outrigger horizontal oil cylinder and the rod chamber of the first outrigger vertical oil cylinder are both connected to the second working oil port;

[0009] A second control valve, which is respectively connected to the first working oil port and the rodless cavity of the second outrigger vertical oil cylinder. The rod chamber of the second outrigger vertical oil cylinder is connected to the second working oil port;

[0010] Wherein, when the second control valve is in the normal position, the rodless cavity of the second outrigger vertical oil cylinder can return oil; when the second control valve is in the first working position, the second outrigger vertical oil cylinder and the first working oil port are conducted.

[0011] In an alternative embodiment, when the second control valve is in the normal position, the rodless cavity of the second outrigger vertical cylinder is unidirectionally communicated with the first working oil port.

[0012] In an alternative embodiment, the second control valve is further connected to the oil return circuit. When the second control valve is in the normal position, the second outrigger vertical cylinder is communicated with the oil return circuit, and the oil port of the second control valve connected to the first working oil port is closed.

[0013] In an alternative embodiment, the second control valve is further connected to the rodless cavity of the counterweight lifting cylinder, and the rod cavity of the counterweight lifting cylinder is connected to the second working oil port;

[0014] Wherein, when the second control valve is in the second working position, the counterweight lifting cylinder is communicated with the first working oil port, and when the second control valve is in the normal position, the rodless cavity of the counterweight lifting cylinder is closed.

[0015] In an alternative embodiment, when the first control valve is in the normal position, the first working oil port and the second working oil port are communicated and also communicated with the main oil return port.

[0016] In an alternative embodiment, the outrigger control system further includes a pilot-operated check valve;

[0017] The inlet oil port of the pilot-operated check valve is connected to the second working oil port, and the pilot control port of the pilot-operated check valve is connected to the main inlet oil port;

[0018] The rod cavity of the first outrigger horizontal cylinder, the rod cavity of the first outrigger vertical cylinder, and the rod cavity of the second outrigger vertical cylinder are all connected to the outlet oil port of the pilot-operated check valve.

[0019] In an alternative embodiment, the outrigger control system further includes a first hydraulic lock. The rodless cavity of the first outrigger vertical cylinder is connected to the first control valve through the first hydraulic lock, and the rod cavity of the first outrigger vertical cylinder is connected to the second working oil port through the first hydraulic lock.

[0020] In an alternative embodiment, the outrigger control system further includes a second hydraulic lock. The rodless cavity of the second outrigger vertical cylinder is connected to the second control valve through the second hydraulic lock, and the rod cavity of the second outrigger vertical cylinder is connected to the second working oil port through the second hydraulic lock.

[0021] In an alternative embodiment, the number of the first control valves is multiple, each of the first control valves is connected to the first working oil port, and each of the first control valves is connected to the rodless cavity of the corresponding first leg horizontal oil cylinder and the rodless cavity of the corresponding first leg vertical oil cylinder.

[0022] In a second aspect, the present invention further provides a working machine, including the leg control system as described above;

[0023] Wherein, the corresponding first leg horizontal oil cylinders and the corresponding first leg vertical oil cylinders are provided on both sides of the working machine, the working machine has a cab, and the second leg vertical oil cylinder is provided at the bottom of the cab.

[0024] When the first leg horizontal oil cylinder or the first leg vertical oil cylinder is retracted by operating the first control valve and the telescopic selection valve according to the present invention, the oil in the rodless cavity of the second leg vertical oil cylinder can return oil through the second control valve in the normal position, so that the second leg vertical oil cylinder retracts, so that the second leg vertical oil cylinder can automatically retract with the retraction of the first leg horizontal oil cylinder or the first leg vertical oil cylinder without active operation, and the problem that the second leg vertical oil cylinder is ignored and not retracted can be avoided.

[0025] In addition, since the second leg vertical oil cylinder returns oil through the second control valve in the normal position, only the second control valve needs to be improved without adding a bypass oil circuit, the improvement workload is small, and it does not affect the complexity of the leg control system, so the design cost is low.

[0026] In addition, there is no need to add additional hydraulic components (such as pipelines, joints and valves), which can reduce the material and manufacturing costs.

[0027] In addition, since the improvement is carried out inside the second control valve, no more connection points and sealing points will be generated, so the risk of hydraulic system leakage will not be increased, nor will the number of failure points and the difficulty of maintenance and repair be increased, and thus the stability and reliability of the leg control system can be improved.

[0028] The working machine provided by the present invention includes all the above advantages of the leg control system because it includes the leg control system provided by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 This is a schematic diagram of the principle of a outrigger control system provided by an embodiment of the present invention;

[0031] Figure 2 This is another schematic diagram of the principle of a outrigger control system provided by an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the principle of the connection of the first control valve, the second control valve and the telescopic selection valve provided by an embodiment of the present invention.

[0033] Explanation of the reference numerals:

[0034] 1. Telescopic selection valve; 101. Main oil inlet; 102. Main oil return port; 103. First working oil port; 104. Second working oil port; 2. First control valve; 3. First outrigger horizontal oil cylinder; 4. First outrigger vertical oil cylinder; 5. Second control valve; 6. Second outrigger vertical oil cylinder; 7. Oil return circuit; 8. Counterweight lifting oil cylinder; 9. Hydraulic check valve; 10. First hydraulic lock; 11. Second hydraulic lock. Detailed implementation manners

[0035] 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. Apparently, the described embodiments are some, but not all, of 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 shall fall within the protection scope of the present invention.

[0036] When the crane is retracting, it is required to retract the outriggers under the cab first according to regulations, and then retract the other outriggers. However, due to the cab layout and vision limitations, when the user operates the outrigger handle, they cannot observe the outriggers under the cab and often forget to retract them and directly retract the other outriggers. This causes the outriggers under the cab to be easily bent when the crane starts to drive, which not only damages the equipment, increases the maintenance cost, but also may cause safety accidents.

[0037] To solve this problem, in the related art, a bypass circuit is provided for the outriggers under the cab, and the rod chambers of the outriggers under the cab are connected to the rod chambers of the outriggers in other positions. During the process of retracting the outriggers in other positions, the oil in the rodless chamber of the outriggers under the cab returns through the bypass circuit, so that there is no need to specifically operate the outriggers under the cab.

[0038] However, this way of setting up the bypass circuit requires redesigning the oil circuit, increasing the complexity of the hydraulic system and resulting in a relatively high design cost. In addition, the newly added bypass circuit requires additional hydraulic components (such as pipelines, connectors, and valves), increasing the material and manufacturing costs. Moreover, the addition of the bypass circuit means more connection points and sealing points, which will increase the risk of leakage in the hydraulic system, more fault points, and the difficulty of maintenance and repair.

[0039] The present invention provides a outrigger control system and a working machine to solve or improve the problem that the outriggers at the bottom of the cab are easily overlooked when being retracted, and at the same time, it can also solve or improve the problems caused by adding a bypass circuit.

[0040] The following combines Figures 1 to 3 , and describes the outrigger control system provided in the embodiments of the present invention. The outrigger control system is applicable to a working machine with outriggers, for example, a crane.

[0041] Specifically, the outrigger control system includes a telescopic selection valve 1, a first control valve 2, and a second control valve 5.

[0042] Among them, the telescopic selection valve 1 has a main oil inlet 101, a main oil return port 102, a first working oil port 103, and a second working oil port 104. Specifically, the telescopic selection valve 1 can connect one of the first working oil port 103 and the second working oil port 104 to the main oil inlet 101, and the other to the main oil return port 102.

[0043] Specifically, the main oil inlet 101 is used to connect to the oil supply circuit. For example, the oil supply circuit is connected to the oil pump assembly. The main oil return port 102 is connected to the oil return circuit 7. For example, the oil return circuit 7 is connected to the fuel tank.

[0044] The first control valve 2 is respectively connected to the first working oil port 103, the rodless cavity of the first outrigger horizontal cylinder 3, and the rodless cavity of the first outrigger vertical cylinder 4. The rod-end cavity of the first outrigger horizontal cylinder 3 and the rod-end cavity of the first outrigger vertical cylinder 4 are both connected to the first working oil port 103.

[0045] Specifically, the first control valve 2 can connect any one of the rodless cavity of the first outrigger horizontal cylinder 3 and the rodless cavity of the first outrigger vertical cylinder 4 to the first working oil port 103.

[0046] Specifically, the oil inlet of the first control valve 2 is connected to the first working oil port 103, and the two working oil ports of the first control valve 2 are respectively connected to the rodless cavity of the first outrigger horizontal cylinder 3 and the rodless cavity of the first outrigger vertical cylinder 4.

[0047] Specifically, the first leg includes a horizontal leg and a vertical leg. Among them, the first leg horizontal oil cylinder 3 is used to drive the horizontal leg to horizontally extend or deploy. The vertical leg is installed on the movable end of the horizontal leg, and the first leg vertical oil cylinder 4 is used to drive the vertical leg to vertically extend or deploy, or the first leg vertical oil cylinder 4 serves as the vertical leg. For example, the first leg is arranged on the side of the vehicle body.

[0048] The second control valve 5 is respectively connected to the first working oil port 103 and the rodless cavity of the second leg vertical oil cylinder 6, that is, the oil inlet of the second control valve 5 is connected to the first working oil port 103, and the working oil port is connected to the rodless cavity of the second leg vertical oil cylinder 6. The rod cavity of the second leg vertical oil cylinder 6 is connected to the second working oil port 104. For example, the second leg vertical oil cylinder 6 is arranged under the cab of the working machine and serves as the second leg or drives the second leg to vertically extend and retract.

[0049] Among them, when the second control valve 5 is in the normal position, the rodless cavity of the second leg vertical oil cylinder 6 can return oil, that is, the second control valve 5 makes the rodless cavity of the second leg vertical oil cylinder 6 directly or indirectly connected to the oil return passage 7 through the internal oil passage.

[0050] When the second control valve 5 is in the first working position, the second leg vertical oil cylinder 6 and the first working oil port 103 are conducted, that is, the second control valve 5 makes the rodless cavity of the second leg vertical oil cylinder 6 communicate with the first working oil port 103.

[0051] In this embodiment, when the first leg horizontal oil cylinder 3 needs to extend, operate the first control valve 2 to make the first control valve 2 control the rodless cavity of the first leg horizontal oil cylinder 3 to be connected to the first working oil port 103. Operate the telescopic selection valve 1 to make the telescopic selection valve 1 control the first working oil port 103 to communicate with the main oil inlet port 101, and the second working oil port 104 to communicate with the main oil return port 102. Then the oil in the oil supply circuit passes through the telescopic selection valve 1 and the first control valve 2 and enters the rodless cavity of the first leg horizontal oil cylinder 3. The oil in the rod cavity of the first leg horizontal oil cylinder 3 returns to the oil return passage 7 through the second working oil port 104, and the first leg horizontal oil cylinder 3 extends.

[0052] When the first leg vertical oil cylinder 4 needs to extend, operate the first control valve 2 to make the first control valve 2 control the rodless cavity of the first leg vertical oil cylinder 4 to be connected to the first working oil port 103. Operate the telescopic selection valve 1 to make the telescopic selection valve 1 control the first working oil port 103 to communicate with the main oil inlet port 101, and the second working oil port 104 to communicate with the main oil return port 102. Then the oil in the oil supply circuit passes through the telescopic selection valve 1 and the first control valve 2 and enters the rodless cavity of the first leg vertical oil cylinder 4. The oil in the rod cavity of the first leg vertical oil cylinder 4 returns to the oil return passage 7 through the second working oil port 104, and the first leg vertical oil cylinder 4 extends.

[0053] When the second vertical leg cylinder 6 needs to extend, operate the second control valve 5 to switch the second control valve 5 to the first working position, so as to control the rodless cavity of the second vertical leg cylinder 6 to be connected to the first working oil port 103. Operate the telescopic selection valve 1 to control the first working oil port 103 to communicate with the main oil inlet port 101, and the second working oil port 104 to communicate with the main oil return port 102. Then the oil in the oil supply circuit passes through the telescopic selection valve 1 and the second control valve 5 and enters the rodless cavity of the second vertical leg cylinder 6. The oil in the rod cavity of the second vertical leg cylinder 6 returns to the oil return circuit 7 through the second working oil port 104, and the second vertical leg cylinder 6 extends.

[0054] When the first horizontal leg cylinder 3 needs to retract, operate the first control valve 2 to control the rodless cavity of the first horizontal leg cylinder 3 to be connected to the first working oil port 103. Operate the telescopic selection valve 1 to control the first working oil port 103 to communicate with the main oil return port 102, and the second working oil port 104 to communicate with the main oil inlet port 101. Then the oil in the oil supply circuit passes through the telescopic selection valve 1 and enters the rod cavity of the first horizontal leg cylinder 3. The oil in the rodless cavity of the first horizontal leg cylinder 3 sequentially passes through the first control valve 2 and the first working oil port 103 and returns to the oil return circuit 7, and the first horizontal leg cylinder 3 retracts.

[0055] Different from the retraction of the first horizontal leg cylinder 3, when the first vertical leg cylinder 4 retracts, the first control valve 2 controls the rodless cavity of the first vertical leg cylinder 4 to be connected to the first working oil port 103.

[0056] Furthermore, since the rod cavity of the second vertical leg cylinder 6 is connected to the second working oil port 104, and whether it is when the first horizontal leg cylinder 3 retracts or when the first vertical leg cylinder 4 retracts, the second working oil port 104 of the telescopic selection valve 1 is always connected to the main oil inlet port 101, a pressure is generated in the rod cavity of the second vertical leg cylinder 6.

[0057] At this time, even if the second control valve 5 is not operated, that is, the second control valve 5 is in the normal position, the oil in the rodless cavity of the second vertical leg cylinder 6 can also return oil through the second control valve 5, so that the second vertical leg cylinder 6 retracts under the action of the oil pressure in the rod cavity.

[0058] Of course, when not controlling the retraction of the first leg horizontal oil cylinder 3 or the first leg vertical oil cylinder 4, the second control valve 5 can also be manipulated to connect the rodless cavity of the second leg vertical oil cylinder 6 to the first working oil port 103. Manipulate the telescopic selection valve 1 to control the first working oil port 103 to communicate with the main oil return port 102, and the second working oil port 104 to communicate with the main oil inlet port 101. Then, the oil in the oil supply circuit passes through the telescopic selection valve 1 and enters the rod cavity of the second leg vertical oil cylinder 6. The oil in the rodless cavity of the second leg vertical oil cylinder 6 returns to the oil return circuit 7 successively through the second control valve 5 and the first working oil port 103, and the second leg vertical oil cylinder 6 retracts. In this way, the retraction of the second leg vertical oil cylinder 6 can be actively controlled or individually controlled.

[0059] With such a setting, when the first control valve 2 and the telescopic selection valve 1 are operated to retract the first leg horizontal oil cylinder 3 or the first leg vertical oil cylinder 4, the oil in the rodless cavity of the second leg vertical oil cylinder 6 can return oil through the second control valve 5 in the normal position, so that the second leg vertical oil cylinder 6 retracts. As a result, the second leg vertical oil cylinder 6 can automatically retract with the retraction of the first leg horizontal oil cylinder 3 or the first leg vertical oil cylinder 4 without active operation, avoiding the problem that the second leg vertical oil cylinder 6 is overlooked and not retracted.

[0060] In addition, since the second leg vertical oil cylinder 6 returns oil through the second control valve 5 in the normal position, only the second control valve 5 needs to be improved without adding a bypass oil circuit. The improvement workload is small and does not affect the complexity of the leg control system, so the design cost is low.

[0061] In addition, there is no need to add additional hydraulic components (such as pipelines, joints, and valves), which can reduce the material and manufacturing costs.

[0062] Furthermore, since the improvement is made inside the second control valve 5, no additional connection points and sealing points will be generated, thus not increasing the risk of hydraulic system leakage, nor increasing the fault points and the difficulty of maintenance and repair, and further improving the stability and reliability of the leg control system.

[0063] In some embodiments provided by the present invention, when the second control valve 5 is in the normal position, the rodless cavity of the second leg vertical oil cylinder 6 is unidirectionally conducted to the first working oil port 103, that is, the second control valve 5 makes the rodless cavity of the second leg vertical oil cylinder 6 indirectly communicate with the oil return circuit 7 through the telescopic selection valve 1.

[0064] In this embodiment, whether the first leg horizontal oil cylinder 3 retracts or the first leg vertical oil cylinder 4 retracts, the second working oil port 104 of the telescopic selection valve 1 is in communication with the main oil inlet 101, so that pressure is generated in the rod chamber of the second leg vertical oil cylinder 6, and the first working oil port 103 is in communication with the main oil return port 102, so that the rodless chamber of the second leg vertical oil cylinder 6 can be in communication with the main oil return port 102 through the second control valve 5 in the normal position and the telescopic selection valve 1.

[0065] At this time, even if the second control valve 5 is not operated, that is, the second control valve 5 is in the normal position, the oil in the rodless chamber of the second leg vertical oil cylinder 6 can also return oil successively through the second control valve 5 and the telescopic selection valve 1, so that the second leg vertical oil cylinder 6 retracts under the action of the oil pressure in the rod chamber.

[0066] In addition, since the second control valve 5 is in the normal position, the rodless chamber of the second leg vertical oil cylinder 6 is unidirectionally conducted to the first working oil port 103, so the oil will not enter the second leg vertical oil cylinder 6 from the first working oil port 103 through the second control valve 5. Thus, during the extension of the first leg horizontal oil cylinder 3 or the first leg vertical oil cylinder 4, the second leg vertical oil cylinder 6 will not extend accordingly.

[0067] Of course, it can be understood that when the second control valve 5 is in the normal position, it is not limited to making the rodless chamber of the second leg vertical oil cylinder 6 unidirectionally conducted to the first working oil port 103. For example, in other embodiments provided by the present invention, the second control valve 5 is also connected to the oil return circuit 7. When the second control valve 5 is in the normal position, the second leg vertical oil cylinder 6 and the oil return circuit 7 are conducted.

[0068] In this embodiment, whether the first leg horizontal oil cylinder 3 retracts or the first leg vertical oil cylinder 4 retracts, the second working oil port 104 of the telescopic selection valve 1 is in communication with the main oil inlet 101, so that pressure is generated in the rod chamber of the second leg vertical oil cylinder 6. The rodless chamber of the second leg vertical oil cylinder 6 can be in communication with the oil return circuit 7 through the second control valve 5 in the normal position.

[0069] At this time, even if the second control valve 5 is not operated, that is, the second control valve 5 is in the normal position, the oil in the rodless chamber of the second leg vertical oil cylinder 6 can also return oil through the second control valve 5, so that the second leg vertical oil cylinder 6 retracts under the action of the oil pressure in the rod chamber.

[0070] Further, when the second control valve 5 is in the normal position, the oil port connecting the second control valve 5 to the first working oil port 103 is closed, so that the oil fluid will not enter the second outrigger vertical cylinder 6 from the first working oil port 103 through the second control valve 5. Thus, during the extension of the first outrigger horizontal cylinder 3 or the first outrigger vertical cylinder 4, the second outrigger vertical cylinder 6 will not extend.

[0071] In some embodiments provided by the present invention, the second control valve 5 is further connected to the rodless cavity of the counterweight lifting cylinder 8, and the rod cavity of the counterweight lifting cylinder 8 is connected to the second working oil port 104.

[0072] Among them, when the second control valve 5 is in the second working position, the counterweight lifting cylinder 8 is communicated with the first working oil port 103, and when the second control valve 5 is in the normal position, the rodless cavity of the counterweight lifting cylinder 8 is closed.

[0073] Specifically, the second control valve 5 is respectively connected to the first working oil port 103, the return oil circuit 7, the rodless cavity of the second outrigger vertical cylinder 6, and the rodless cavity of the counterweight lifting cylinder 8.

[0074] Among them, when the second control valve 5 is in the first working position, the rodless cavity of the second outrigger vertical cylinder 6 is communicated with the first working oil port 103. When the second control valve 5 is in the second working position, the rodless cavity of the counterweight lifting cylinder 8 is communicated with the first working oil port 103. When the second control valve 5 is in the normal position, the oil port connecting the second control valve 5 to the first working oil port 103 is closed, the rodless cavity of the second outrigger vertical cylinder 6 returns oil, and the rodless cavity of the counterweight lifting cylinder 8 is closed.

[0075] In this embodiment, on the premise that the telescopic selection valve 1 controls the first working oil port 103 to be communicated with the main oil inlet port 101 and the second working oil port 104 to be communicated with the main oil return port 102, when the second control valve 5 is switched to the first working position, the second outrigger vertical cylinder 6 extends. When the second control valve 5 is switched to the second working position, the counterweight lifting cylinder 8 extends. When the second control valve 5 is switched to the normal position, the second control valve 5 can close the counterweight lifting cylinder 8 and can make the second outrigger vertical cylinder 6 return oil.

[0076] With such a setting, the extension control of the second outrigger vertical cylinder 6 and the extension control of the counterweight lifting cylinder 8 can be integrated on the second control valve 5, eliminating the need to separately set up a set of complex control valve groups and oil circuit systems for the counterweight lifting cylinder 8. This can reduce the number of hydraulic components, simplify the structure of the entire outrigger control system, reduce the complexity of the system, make the system layout more compact, and facilitate installation, maintenance, and management.

[0077] In addition, when controlling the equipment, only by operating a second control valve 5 can the elongation control of the second outrigger vertical oil cylinder 6 and the counterweight lifting oil cylinder 8 be achieved. The operation steps are more concise, which can reduce the operation difficulty and the possibility of misoperation.

[0078] Reference Figures 1 - 3 As shown, optionally, the second control valve 5 can be set as a three-position four-way directional control valve, and its normal position can be the middle position.

[0079] Reference Figures 1 - 3 As shown, optionally, the first control valve 2 can be set as a three-position four-way directional control valve.

[0080] For example, when the first control valve 2 is in the first working position, the rodless cavity of the first outrigger horizontal oil cylinder 3 is communicated with the first working oil port 103, and the oil port where the first control valve 2 is connected to the first outrigger vertical oil cylinder 4 is closed. When the first control valve 2 is in the second working position, the rodless cavity of the first outrigger vertical oil cylinder 4 is communicated with the first working oil port 103, and the oil port where the first control valve 2 is connected to the first outrigger horizontal oil cylinder 3 is closed. When the first control valve 2 is in the normal position, the oil ports where the first control valve 2 is connected to the first outrigger vertical oil cylinder 4 and the first outrigger horizontal oil cylinder 3 are both closed.

[0081] In some embodiments provided by the present invention, the outrigger control system further includes a first hydraulic lock 10.

[0082] The rodless cavity of the first outrigger vertical oil cylinder 4 is connected to the first control valve 2 through the first hydraulic lock 10, and the rod end cavity of the first outrigger vertical oil cylinder 4 is connected to the second working oil port 104 through the first hydraulic lock 10.

[0083] In this embodiment, the first hydraulic lock 10 can reliably lock the state of the oil cylinder after the first outrigger vertical oil cylinder 4 reaches the required position, preventing it from displacing due to external forces (such as equipment vibration, load change, etc.).

[0084] In addition, the first hydraulic lock 10 can prevent the oil in the rodless cavity and the rod end cavity of the first outrigger vertical oil cylinder 4 from flowing back. That is, when the hydraulic system stops supplying oil, the first hydraulic lock 10 can maintain the pressure in the two cavities of the oil cylinder, preventing the oil from flowing reversely under the action of gravity or other external forces, so as to maintain the position of the oil cylinder unchanged.

[0085] In some embodiments provided by the present invention, the outrigger control system further includes a second hydraulic lock 11. The rodless cavity of the second outrigger vertical oil cylinder 6 is connected to the second control valve 5 through the second hydraulic lock 11, and the rod end cavity of the second outrigger vertical oil cylinder 6 is connected to the second working oil port 104 through the second hydraulic lock 11.

[0086] In this embodiment, the second hydraulic lock 11 can reliably lock the state of the cylinder after the second outrigger vertical cylinder 6 reaches the required position, preventing it from displacing due to external forces (such as equipment vibration, load changes, etc.).

[0087] In addition, the second hydraulic lock 11 can prevent the oil in the rodless cavity and the rod cavity of the second outrigger vertical cylinder 6 from flowing back. That is, when the hydraulic system stops supplying oil, the second hydraulic lock 11 can maintain the pressure in both cavities of the cylinder, preventing the oil from flowing back under the action of gravity or other external forces, thereby maintaining the position of the cylinder unchanged.

[0088] In some embodiments provided by the present invention, when the telescopic selection valve 1 is in the normal position, the first working oil port 103 and the second working oil port 104 are conducted and are conducted with the main oil return port 102.

[0089] Optionally, as shown in Figure 3 When the telescopic selection valve 1 is in the first working position, the first working oil port 103 and the main oil inlet port 101 are conducted, and the second working oil port 104 is conducted with the main oil return port 102. When the telescopic selection valve 1 is in the second working position, the first working oil port 103 and the main oil return port 102 are conducted, and the second working oil port 104 is conducted with the main oil inlet port 101. When the telescopic selection valve 1 is in the normal position, the first working oil port 103 and the second working oil port 104 are conducted and are conducted with the main oil return port 102.

[0090] In this embodiment, when the telescopic selection valve 1 is in the normal position, the first working oil port 103 and the second working oil port 104 are conducted and are conducted with the main oil return port 102, so that when the outrigger operation is not performed, the oil in the system can smoothly return to the fuel tank, which helps to reduce the pressure in the system, reduce the wear of hydraulic components, and at the same time can also avoid the accumulation of oil in the pipeline to generate unnecessary pressure fluctuations, causing problems such as unlocking of the hydraulic lock or telescoping of the cylinder, ensuring the stability and reliability of the system.

[0091] In addition, the oil circuit conduction setting in the normal position can adjust the oil circuit state of the system to a relatively safe state when the equipment starts or stops. For example, even if the operator makes a misoperation when the equipment starts, since the telescopic selection valve 1 is in the normal position, the oil can return to the oil normally, and it will not cause unexpected actions of the outrigger cylinder, thereby improving the safety of the equipment and preventing safety accidents caused by misoperations.

[0092] In some embodiments provided by the present invention, the outrigger control system further includes a pilot-operated check valve 9.

[0093] The oil inlet of the pilot-operated check valve 9 is connected to the second working oil port 104, and the pilot control port of the pilot-operated check valve 9 is connected to the main oil inlet port 101.

[0094] The rodless chambers of the first outrigger horizontal oil cylinder 3, the rodless chambers of the first outrigger vertical oil cylinder 4, and the rodless chambers of the second outrigger vertical oil cylinder 6 are all connected to the oil outlet of the hydraulic control check valve 9.

[0095] That is, the rodless chambers of the first outrigger horizontal oil cylinder 3, the rodless chambers of the first outrigger vertical oil cylinder 4, and the rodless chambers of the second outrigger vertical oil cylinder 6 are all connected to the second working oil port 104 through the hydraulic control check valve 9. When there is no pressure at the hydraulic control port of the hydraulic control check valve 9, the hydraulic control check valve 9 is normally closed along the direction from the telescopic selection valve 1 to the hydraulic control check valve 9.

[0096] In this embodiment, when it is necessary to retract the first outrigger horizontal oil cylinder 3, the first outrigger vertical oil cylinder 4, or the second outrigger vertical oil cylinder 6, the telescopic selection valve 1 controls the second working oil port 104 to communicate with the main oil inlet port 101. The oil pressure at the main oil inlet port 101 is relatively high, and the oil is transmitted to the hydraulic control check valve 9 to drive the opening of the hydraulic check valve.

[0097] By setting the hydraulic control check valve 9, there are at least the following two advantages.

[0098] First, referring to Figure 1 or Figure 2 shown, if the hydraulic control check valve 9 is not set, when the telescopic selection valve 1 and the second control valve 5 are both in the normal position, if the second hydraulic lock 11 is damaged, the oil in the rodless chamber of the second outrigger vertical oil cylinder 6 can enter the rodless chamber of the second outrigger vertical oil cylinder 6 through the telescopic selection valve 1, resulting in the retraction of the second outrigger vertical oil cylinder 6.

[0099] By setting the hydraulic control check valve 9, when the telescopic selection valve 1 is in the normal position, the main oil inlet port 101 is in a pressure relief state, and the hydraulic control check valve 9 is closed. At this time, even if the second hydraulic lock 11 is damaged, the oil in the rodless chamber of the second outrigger vertical oil cylinder 6 cannot return to the rodless chamber of the second outrigger vertical oil cylinder 6 through the hydraulic control check valve 9, which can prevent the retraction of the second outrigger vertical oil cylinder 6 and improve safety.

[0100] It can be understood that for the first outrigger vertical oil cylinder 4, when the first hydraulic lock 10 is damaged and there is a misoperation of the first control valve 2, the hydraulic control check valve 9 can also prevent the retraction of the first outrigger vertical oil cylinder 4.

[0101] Second, referring to Figure 1 or Figure 2 shown, if the hydraulic control check valve 9 is not set, when the telescopic selection valve 1 and the second control valve 5 are both in the normal position, if the pressure of the return oil circuit 7 increases (for example, when there are many oil return components in the hydraulic system), without the hydraulic control check valve 9, the oil in the return oil circuit 7 may run to the second hydraulic lock 11 through the telescopic selection valve 1, prompting the second hydraulic lock 11 to open and causing the second outrigger vertical oil cylinder 6 to retract.

[0102] By setting the hydraulic control check valve 9, when the telescopic selection valve 1 is in the normal position, the main oil inlet 101 is in the pressure relief state, and the hydraulic control check valve 9 is closed. Even if the oil in the return oil circuit 7 enters the second control valve 5, it cannot enter the rodless cavity of the second outrigger vertical cylinder 6 through the hydraulic control check valve 9.

[0103] In some embodiments provided by the present invention, the number of the first control valves 2 is multiple, each first control valve 2 is connected to the first working oil port 103, and each first control valve 2 is connected to the rodless cavity of the corresponding first outrigger horizontal cylinder 3 and the rodless cavity of the corresponding first outrigger vertical cylinder 4.

[0104] With such a setting, the outrigger control system can control multiple first outriggers.

[0105] Optionally, the number of the first control valves 2 is four, corresponding to four groups of first outriggers, and the four groups of first outriggers are distributed on both sides of the working machine.

[0106] In some embodiments provided by the present invention, the outrigger control system includes a telescopic selection valve 1, a first control valve 2, a second control valve 5, and a hydraulic control check valve 9.

[0107] Among them, the telescopic selection valve 1 has a main oil inlet 101, a main oil return port 102, a first working oil port 103, and a second working oil port 104.

[0108] Specifically, when the telescopic selection valve 1 is in the first working position, the first working oil port 103 is communicated with the main oil inlet 101, and the second working oil port 104 is communicated with the main oil return port 102. When the telescopic selection valve 1 is in the second working position, the first working oil port 103 is communicated with the main oil return port 102, and the second working oil port 104 is communicated with the main oil inlet 101. When the telescopic selection valve 1 is in the normal position, the first working oil port 103 is communicated with the second working oil port 104 and is communicated with the main oil return port 102.

[0109] The first control valve 2 is respectively connected to the first working oil port 103, the rodless cavity of the first outrigger horizontal cylinder 3, and the rodless cavity of the first outrigger vertical cylinder 4. The rodless cavity of the first outrigger horizontal cylinder 3 and the rodless cavity of the first outrigger vertical cylinder 4 are both connected to the first working oil port 103.

[0110] Specifically, when the first control valve 2 is in the first working position, the rodless cavity of the first outrigger horizontal oil cylinder 3 is communicated with the first working oil port 103, and the oil port where the first control valve 2 is communicated with the first outrigger vertical oil cylinder 4 is closed. When the first control valve 2 is in the second working position, the rodless cavity of the first outrigger vertical oil cylinder 4 is communicated with the first working oil port 103, and the oil port where the first control valve 2 is communicated with the first outrigger horizontal oil cylinder 3 is closed. When the first control valve 2 is in the normal position, the oil ports where the first control valve 2 is connected to the first outrigger vertical oil cylinder 4 and the first outrigger horizontal oil cylinder 3 are both closed.

[0111] The second control valve 5 is respectively connected to the first working oil port 103, the rodless cavity of the second outrigger vertical oil cylinder 6, and the rodless cavity of the counterweight lifting oil cylinder 8. The rod chambers of the second outrigger vertical oil cylinder 6 and the counterweight lifting oil cylinder 8 are both connected to the second working oil port 104.

[0112] Specifically, in the state where the second control valve 5 is in the first working position, the rodless cavity of the second outrigger vertical oil cylinder 6 is communicated with the first working oil port 103. In the state where the second control valve 5 is in the second working position, the rodless cavity of the counterweight lifting oil cylinder 8 is communicated with the first working oil port 103. In the state where the second control valve 5 is in the normal position, the oil port where the second control valve 5 is connected to the first working oil port 103 is closed, the rodless cavity of the second outrigger vertical oil cylinder 6 returns oil, and the rodless cavity of the counterweight lifting oil cylinder 8 is closed. For example, in the state where the second control valve 5 is in the normal position, the rodless cavity of the second outrigger vertical oil cylinder 6 is unidirectionally communicated with the first working oil port 103 or communicated with the return oil path 7.

[0113] The oil inlet of the hydraulic check valve 9 is connected to the second working oil port 104, and the hydraulic control port of the hydraulic check valve 9 is connected to the main oil inlet 101. The rod chambers of the first outrigger horizontal oil cylinder 3, the first outrigger vertical oil cylinder 4, and the second outrigger vertical oil cylinder 6 are all connected to the oil outlet of the hydraulic check valve 9.

[0114] The number of the first control valves 2 is multiple. Each first control valve 2 is connected to the first working oil port 103, and each first control valve 2 is connected to the rodless cavity of the corresponding first outrigger horizontal oil cylinder 3 and the rodless cavity of the corresponding first outrigger vertical oil cylinder 4.

[0115] In this embodiment, the features of the above-mentioned multiple embodiments are integrated, and corresponding technical effects are achieved accordingly, which will not be elaborated here.

[0116] An operation machine is further provided in an embodiment of the present invention.

[0117] Specifically, the operation machine includes the outrigger control system as above.

[0118] Wherein, corresponding first outrigger horizontal cylinders 3 and corresponding first outrigger vertical cylinders 4 are provided on both sides of the work machine. The work machine has a cab, and a second outrigger vertical cylinder 6 is provided at the bottom of the cab.

[0119] It should be noted that the work machine includes an outrigger control system and thus includes all the above advantages of the outrigger control system, so it will not be elaborated herein.

[0120] In addition, it should be noted that the work machine includes, but is not limited to, a crane.

[0121] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A leg control system, characterized in that: include: A telescopic selector valve (1) having a main oil inlet (101), a main oil return port (102), a first working oil port (103) and a second working oil port (104); The first control valve (2) is respectively connected to the first working oil port (103), the rodless chamber of the first leg horizontal oil cylinder (3) and the rodless chamber of the first leg vertical oil cylinder (4); the rod chamber of the first leg horizontal oil cylinder (3) and the rod chamber of the first leg vertical oil cylinder (4) are both connected to the second working oil port (104); A second control valve (5) is respectively connected to the first working oil port (103) and the rodless chamber of the second outrigger vertical oil cylinder (6); the rod chamber of the second outrigger vertical oil cylinder (6) is connected to the second working oil port (104); When the second control valve (5) is in the normal position, the rodless chamber of the second leg vertical cylinder (6) can return oil; when the second control valve (5) is in the first working position, the second leg vertical cylinder (6) and the first working oil port (103) are connected.

2. The outrigger control system according to claim 1, characterized in that: When the second control valve (5) is in a normal position, the rodless chamber of the second leg vertical oil cylinder (6) is unidirectionally connected to the first working oil port (103).

3. The outrigger control system according to claim 1, characterized in that: The second control valve (5) is also connected to the oil return circuit (7). When the second control valve (5) is in a normal position, the second leg vertical oil cylinder (6) and the oil return circuit (7) are connected, and the oil port connecting the second control valve (5) and the first working oil port (103) is closed.

4. The outrigger control system according to any one of claims 1 to 3, characterized in that: The second control valve (5) is also connected to the rodless chamber of the counterweight lifting cylinder (8), and the rod chamber of the counterweight lifting cylinder (8) is connected to the second working oil port (104); When the second control valve (5) is in the second working position, the counterweight lifting cylinder (8) is connected to the first working oil port (103); when the second control valve (5) is in the normal position, the rodless chamber of the counterweight lifting cylinder (8) is closed.

5. The outrigger control system according to claim 1, characterized in that: When the first control valve (2) is in a normal position, the first working oil port (103) and the second working oil port (104) are connected, and are also connected to the main oil return port (102).

6. The outrigger control system according to claim 1, characterized in that: The outrigger control system further comprises a hydraulically controlled one-way valve (9); The oil inlet of the hydraulically controlled one-way valve (9) is connected to the second working oil port (104), and the hydraulic control port of the hydraulically controlled one-way valve (9) is connected to the main oil inlet (101); The rod chamber of the first leg horizontal oil cylinder (3), the rod chamber of the first leg vertical oil cylinder (4) and the rod chamber of the second leg vertical oil cylinder (6) are all connected to the oil outlet of the hydraulically controlled one-way valve (9).

7. The outrigger control system according to any one of claims 1 to 3, characterized in that: The outrigger control system also includes a first hydraulic lock (10), the rodless chamber of the first outrigger vertical oil cylinder (4) is connected to the first control valve (2) through the first hydraulic lock (10), and the rod chamber of the first outrigger vertical oil cylinder (4) is connected to the second working oil port (104) through the first hydraulic lock (10).

8. The outrigger control system according to any one of claims 1 to 3, characterized in that: The outrigger control system also includes a second hydraulic lock (11), the rodless chamber of the second outrigger vertical cylinder (6) is connected to the second control valve (5) through the second hydraulic lock (11), and the rod chamber of the second outrigger vertical cylinder (6) is connected to the second working oil port (104) through the second hydraulic lock (11).

9. The outrigger control system according to any one of claims 1 to 3, characterized in that: There are multiple first control valves (2), each of which is connected to the first working oil port (103), and each of which is connected to the rodless chamber of the corresponding first leg horizontal cylinder (3) and the rodless chamber of the corresponding first leg vertical cylinder (4).

10. A working machine, characterized in that: comprising an outrigger control system as claimed in any one of claims 1 to 9; Wherein, corresponding first leg horizontal cylinders (3) and corresponding first leg vertical cylinders (4) are provided on both sides of the operating machine, and the operating machine has a cab, and the bottom of the cab is provided with the second leg vertical cylinder (6).

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