Crane hydraulic control system and crane

Abstract

This invention belongs to the field of hydraulic system technology, specifically relating to a crane hydraulic control system and a crane. The crane hydraulic control system includes: a slewing control subsystem adapted for transmission connection with a slewing mechanism; a hoisting control subsystem adapted for transmission connection with a hoisting mechanism; and a main control component connected to the slewing and hoisting control subsystems via a main control oil circuit. The main control component can control the oil supply state of the main control oil circuit to adjust the slewing and hoisting control subsystems between normal operating and free-floating states. Through the technical solution of this invention, the crane boom can enter a free-floating state via the slewing and hoisting control subsystems. The operation process is simple and convenient, achieving one-button operation, effectively preventing operators from missing operation steps, and effectively reducing safety hazards when the crane boom is carried by an external trailer.

Description

Technical Field

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

[0002] In the crane industry, as the bridge load of cranes increases, some cranes have adopted a method of attaching a trailer to the rear of the crane body during travel to support the boom, thereby reducing the bridge load during crane travel. In this method, the trailer is flexibly connected to the crane body, and the boom's slewing and hoisting mechanisms need to be in a free-floating state so that the boom can move accordingly with the trailer when the road surface is uneven or when turning.

[0003] In existing crane hydraulic systems, the connections and control strategies are complex, and the slewing and hoisting mechanisms are usually independent. To achieve simultaneous free-floating of both mechanisms, separate control operations are required for each. This necessitates performing different control operations on multiple components before crane movement, making the process cumbersome and prone to omissions. If any control operation is missed, the slewing and hoisting mechanisms cannot fully enter a free-floating state. Traveling the crane in this state can easily damage the boom and related mechanisms, posing a safety hazard and increasing the risk of accidents during operation. Summary of the Invention

[0004] In view of this, in order to improve at least one of the above-mentioned problems existing in the prior art, the present invention provides a crane hydraulic control system and a crane.

[0005] A first aspect of the present invention provides a crane hydraulic control system for a crane having a hoisting mechanism, a slewing mechanism, and a boom. The crane hydraulic control system includes: a slewing control subsystem adapted to be driveably connected to the slewing mechanism to drive the boom to rotate; a hoisting control subsystem adapted to be driveably connected to the boom to drive the boom to raise or lower; and a main control component connected to the slewing control subsystem and the hoisting control subsystem via a main control oil circuit, the main control component being capable of controlling the oil supply state of the main control oil circuit to control the state adjustment of the slewing control subsystem and the hoisting control subsystem between a normal operating state and a free-floating state.

[0006] The beneficial effects of the above-mentioned technical solution of the present invention are reflected in:

[0007] The overall system connectivity and control logic have been improved and optimized. The main control component can adjust the states of the slewing control subsystem and the hoisting control subsystem, enabling both subsystems to simultaneously enter a free-floating state. This allows the boom to move accordingly with the trailer when the crane is traveling with the boom supported by the trailer. Furthermore, only a one-time control operation is required on the main control component, making the operation simple and convenient, achieving a one-button operation effect. This effectively prevents operators from missing operation steps, significantly reducing the possibility that the boom may not be fully in a free-floating state during crane travel, and also reducing safety hazards during travel.

[0008] In one feasible implementation, the main control component includes a main control valve, one end of which is connected to the input end of the main control oil circuit via a pipeline, and the other end of which is connected to the oil tank. The main control valve can control the main control oil to flow into the main control oil circuit or into the oil tank.

[0009] In one feasible implementation, the main control component further includes: a detector located in the main control oil circuit, the detector being adapted to detect the oil pressure in the main control oil circuit; and an accumulator connected to the main control oil circuit via a pipeline, the accumulator being adapted to perform oil replenishment or overflow operations on the main control oil circuit; wherein, the main control valve is a manual control valve or a hydraulic control valve.

[0010] In one feasible implementation, the slewing control subsystem includes: a slewing drive mechanism, which is connected to the slewing mechanism via a transmission; a slewing brake, which is correspondingly configured to the slewing drive mechanism and is capable of braking the slewing drive mechanism; a shuttle valve, one of its input ports being connected to the main control oil circuit via a pipeline, and the output port of the shuttle valve being connected to the slewing brake; a first slewing control valve, which is connected to the other input port of the shuttle valve via a pipeline, and the slewing brake can adjust its working state under the action of the oil in the first slewing control valve or under the action of the main control oil in the main control oil circuit; and a second slewing control valve, one end of which is connected to the oil tank, and the other end of which is connected to the inlet and return oil circuits of the slewing drive mechanism, and the control end of the second slewing control valve is connected to the main control oil circuit and can be opened under the action of the main control oil to connect the inlet and return oil circuits of the slewing drive mechanism.

[0011] In one feasible implementation, the rotary drive mechanism includes: a closed-loop rotary oil pump; a rotary motor, wherein the two working oil ports of the rotary motor are respectively connected to the two oil ports of the closed-loop rotary oil pump through pipelines, and one of the two pipelines connecting the two working oil ports of the rotary motor forms an oil inlet pipeline and the other forms an oil return pipeline, and the output end of the rotary motor is connected to the rotary mechanism for transmission.

[0012] In one feasible implementation, two parallel internal oil circuits are formed within the second rotary control valve. One end of each internal oil circuit is connected to the oil tank, and the other end of each internal oil circuit is connected to the oil inlet and oil return lines of the rotary motor, respectively. The second rotary control valve is a hydraulically controlled check valve group or a hydraulically controlled valve group.

[0013] In one feasible implementation, the hoisting mechanism includes: a hoisting drive mechanism, which is connected to the boom via a transmission; and a hoisting control subsystem including: a hoisting control component, which is connected to the hoisting drive mechanism via a pipeline, the hoisting control component being adapted to control the operation of the hoisting drive mechanism; and a second hoisting control valve, the two ends of which are respectively connected to the inlet oil pipeline and the return oil pipeline of the hoisting drive mechanism via pipelines, the control end of the second hoisting control valve being connected to the main control oil circuit via a pipeline, and the second hoisting control valve being able to conduct under the action of the main control oil in the main control oil circuit, so as to connect the inlet oil pipeline and the return oil pipeline of the hoisting drive mechanism.

[0014] In one feasible implementation, the hoisting drive mechanism includes: a boom cylinder, which is drivenly connected to the boom; the rod chamber and rodless chamber of the boom cylinder are respectively connected to the hoisting control assembly via pipelines; one of the pipelines connecting the rod chamber and the pipeline connecting the rodless chamber of the boom cylinder forms an oil inlet pipeline, and the other forms an oil return pipeline; one end of the second hoisting control valve is connected to the pipeline connected to the rod chamber of the boom cylinder via a pipeline, and the other end of the second hoisting control valve is connected to the pipeline connected to the rodless chamber of the boom cylinder via a pipeline; the control end of the second hoisting control valve is connected to the main control oil circuit via a pipeline; wherein, the second hoisting control valve is a hydraulically controlled check valve or a hydraulically controlled valve.

[0015] In one feasible embodiment, the hoisting control assembly includes: a luffing balance valve disposed in a pipeline connecting the rodless chamber of the hoisting cylinder, the return port of the luffing balance valve being connected to an oil tank via a pipeline; a hoisting first control valve connected via pipelines to the inlet of the luffing balance valve and the rod chamber of the hoisting cylinder, the hoisting first control valve being adapted to connect to an oil supply device and capable of controlling the oil supply status to the hoisting cylinder; and a drooping control valve connected via a pipeline to the interior of the luffing balance valve, the drooping control valve being adapted to control the valve core reversal of the luffing balance valve.

[0016] A second aspect of the present invention also provides a crane, comprising: a car body; a slewing mechanism rotatably mounted on the car body; a boom rotatably connected to the slewing mechanism, a portion of the boom extending outward from the car body and adapted to be supported on an auxiliary support device; a hoisting mechanism mounted on the car body, the hoisting mechanism being drivenly connected to the boom and adapted to drive the boom to lift or lower; and a crane hydraulic control system as described in any of the first aspects above, mounted on the car body; wherein the slewing control subsystem is drivenly connected to the slewing mechanism, and the hoisting control subsystem is drivenly connected to the hoisting mechanism. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic diagram of a crane hydraulic control system according to an embodiment of the present invention.

[0018] Figure 2 The diagram shown is a schematic diagram of a crane hydraulic control system according to an embodiment of the present invention.

[0019] Figure 3 The diagram shown is a schematic diagram of a crane provided in one embodiment of the present invention.

[0020] Figure 4 The diagram shown is a schematic diagram of a crane hydraulic control system according to an embodiment of the present invention.

[0021] Figure 5 The diagram shown is a schematic block diagram of a crane provided in one embodiment of the present invention. Detailed Implementation

[0022] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0023] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The following provides some embodiments of the crane hydraulic control system and the crane in the technical solution of the present invention.

[0026] In an embodiment of a first aspect of the invention, a crane hydraulic control system 1 is provided. For example... Figure 1 and Figure 2 As shown, the crane hydraulic control system 1 includes a slewing control subsystem 11, a hoisting control subsystem 12, a main control component 13, and a main control oil circuit 14. The crane hydraulic control system 1 can be applied to cranes with a hoisting mechanism 20, a slewing mechanism, and a boom.

[0027] like Figure 1 and Figure 2 As shown, the main control component 13 is connected to the slewing control subsystem 11 and the hoisting control subsystem 12 via the main control oil circuit 14. The main control component 13 can control the oil supply status in the main control oil circuit 14. When installed on a crane, as... Figure 3 In the example, the slewing control subsystem 11 is driven by the slewing mechanism of the crane to drive the slewing mechanism to rotate relative to the crane body, thereby driving the boom to rotate relative to the crane body; the hoisting control subsystem 12 is driven by the hoisting mechanism 20 of the crane to drive the boom to lift or lower relative to the crane body. The main control component 13 controls the oil supply status of the main control oil circuit 14, i.e., controls whether the main control oil flows into the main control oil circuit, to adjust the states of the slewing control subsystem 11 and the hoisting control subsystem 12, adjusting them between normal operating state and free floating state, thereby adjusting the corresponding slewing mechanism and hoisting mechanism 20 between normal operating state and free floating state, and ultimately adjusting the boom between normal operating state and free floating state.

[0028] It should be noted that the free-floating state specifically refers to the state in which the slewing mechanism can rotate freely around the slewing center, and the hoisting mechanism 20 drives the crane arm to rise or fall freely around the slewing center.

[0029] When the main control component 13 causes the main control oil to flow into the main control oil circuit 14, the main control oil can flow through the main control oil circuit 14 to the slewing control subsystem 11 and the hoisting control subsystem 12 to act on the slewing control subsystem 11 and the hoisting control subsystem 12, thereby causing the slewing mechanism and the hoisting mechanism 20 to enter a free-floating state; when the main control component 13 prevents the main control oil from flowing into the main control oil circuit 14 or causes the main control oil to flow back to the oil tank 10, the oil supply to the main control oil circuit 14 is stopped. At this time, the slewing control subsystem 11 and the hoisting control subsystem 12 are in normal working condition and perform normal slewing operation and hoisting or lowering operation.

[0030] It is understandable that, in order to reduce the bridge load on the crane during operation, a trailer is usually attached to the rear of the crane body to assist in supporting the boom. The trailer is flexibly connected to the crane body, and correspondingly, the boom's slewing and hoisting mechanisms need to be in a free-floating state so that the boom can move accordingly with the trailer when the road surface is uneven or turning. However, existing crane hydraulic systems involve many control steps for state adjustment, making the operation process complex. Operators are prone to overlooking certain steps when operating the crane on the construction site.

[0031] The crane hydraulic control system 1 in this embodiment improves and optimizes the control method by using the main control component 13 to uniformly control the slewing control subsystem 11 and the hoisting control subsystem 12. This allows the crane's slewing mechanism and hoisting mechanism 20 to drive the boom into a free-floating state, and enables one-button operation. This greatly simplifies the control operation process and steps, improves the efficiency of the control operation, and effectively prevents operators from missing individual operation steps when making adjustments. This avoids the phenomenon that the crane starts to move before the slewing mechanism and hoisting mechanism 20 have fully entered the free state, which helps to reduce the possibility of damage to the boom and related mechanisms during travel and also helps to reduce safety hazards.

[0032] In a further embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the main control component 13 of the crane hydraulic control system 1 includes a main control valve 131. One end of the main control valve 131 is connected to the input end of the main control oil circuit 14 via a pipeline, and the other end of the main control valve 131 is connected to the oil tank 10; when the main control valve 131 is open, as... Figure 2 In the current state, the main control oil flows directly back to the oil tank 10 through the main control valve 131. At this time, no main control oil is supplied to the slewing control subsystem 11 and the hoisting control subsystem 12, and both systems are in normal operating condition. When the main control valve 131 is closed, as... Figure 1 In the state of the main control oil, the main control oil enters the main control oil circuit 14 through the main control valve 131, and then flows to the slewing control subsystem 11 and the hoisting control subsystem 12, respectively, and acts on the slewing control subsystem 11 and the hoisting control subsystem 12, so that the slewing control subsystem 11 and the hoisting control subsystem 12 enter the free floating state, so that the slewing mechanism and the hoisting mechanism 20 of the crane drive the boom to enter the free floating state accordingly.

[0033] It should be noted that the main control valve 131 can also be directly set at the input end of the main control oil circuit 14. The opening and closing operation of the main control valve 131 controls the flow of main control oil into the main control oil circuit 14 or prevents the flow of main control oil into the main control oil circuit 14.

[0034] Furthermore, such as Figure 1 and Figure 2 As shown, the main control component 13 also includes a detector 132 and an accumulator 133. The detector 132 is located in the main control oil circuit 14 to detect the oil pressure of the main control oil in the main control oil circuit 14. It can be understood that the control oil pressure in the main control oil circuit 14 needs to reach a certain level to control the slewing control subsystem 11 and the hoisting control subsystem 12. By detecting the oil pressure in the main control oil circuit 14 through the detector 132, the operator can know whether control oil pressure has entered the main control oil circuit 14, and can also accurately determine whether the oil pressure in the main control oil circuit 14 meets the requirements, so that appropriate countermeasures can be taken in a timely manner when the oil pressure is abnormal. Specifically, the detector 132 can be an oil pressure sensor or other sensors capable of detecting oil pressure; the detector 132 can be directly connected to the pipeline of the main control oil circuit 14, or it can be connected to the main control oil circuit 14 through a pipeline.

[0035] Accumulator 133 is connected to main control oil circuit 14 via pipeline. Accumulator 133 can perform oil replenishment or overflow operations on main control oil circuit 14 to balance the oil pressure in main control oil circuit 14. Specifically, when the oil pressure in main control oil circuit 14 is too high, a portion of the main control oil in main control oil circuit 14 can flow into accumulator 133 for storage, realizing an overflow operation to reduce the oil pressure in main control oil circuit 14; when the main control oil pressure in main control oil circuit 14 is too low, the control oil pressure stored in accumulator 133 can flow into main control oil circuit 14 to perform oil replenishment operation to increase the oil pressure in main control oil circuit 14.

[0036] In a further embodiment of the present invention, such as Figure 1 and Figure 2As shown, in the crane hydraulic control system 1, the slewing control subsystem 11 includes a slewing drive mechanism 111, a slewing brake 112, a shuttle valve 113, a first slewing control valve 114, and a second slewing control valve 115. The slewing drive mechanism 111 is connected to the crane's slewing mechanism; the slewing brake 112 is correspondingly provided to the slewing drive mechanism 111 to brake the slewing drive mechanism 111. When the slewing drive mechanism 111 is in the braking state, the slewing mechanism is locked and cannot perform slewing operations. One input port of the shuttle valve 113 is connected to the main control oil circuit 14 through a pipeline, and the other input port of the shuttle valve 113 is connected to the first slewing control valve 114 through a pipeline. The output port of the shuttle valve 113 is connected to the slewing brake 112, so that the shuttle valve 113 can be used to switch between the main control oil circuit 14 and the first slewing control valve 114 to control the slewing brake 112. When the main control oil circuit 14 inputs main control oil to the rotary brake 112 through the shuttle valve 113, the rotary brake 112 stops braking, and the rotary mechanism is in a non-locked state. When the main control oil circuit 14 does not input main control oil to the rotary brake 112 through the shuttle valve 113, the rotary motor 1112 is in normal working condition, and the rotary brake 112 works under the control of the first rotary control valve 114. Additionally, one end of the second slewing control valve 115 is connected to the oil tank 10, and the other end is connected to the oil inlet and return lines of the slewing drive mechanism 111. The control terminal of the second slewing control valve 115 is connected to the main control oil circuit 14. When the main control oil in the main control oil circuit 14 flows into the second slewing control valve 115, the second slewing control valve 115 is turned on, connecting the oil inlet and return lines of the slewing drive mechanism 111 to maintain pressure balance in the oil inlet and return lines of the slewing drive mechanism 111. When the slewing brake 112 is in a non-braking state and the second slewing control valve 115 is turned on, the slewing drive mechanism 111 enters a free-floating state, and the crane's slewing mechanism also enters a corresponding free-floating state.

[0037] Furthermore, such as Figure 1 and Figure 2 As shown, the slewing drive mechanism 111 specifically includes a closed-loop slewing oil pump 1111 and a slewing motor 1112. The two working ports of the slewing motor 1112 are connected to the two ports of the closed-loop slewing oil pump 1111 via pipelines to form a closed loop. One pipeline connecting the two working ports of the slewing motor 1112 forms an oil inlet pipeline, and the other forms an oil return pipeline. It can be understood that the functions of the oil inlet pipeline and the oil return pipeline can be interchanged depending on the direction of oil flow. The output end of the slewing motor 1112 is connected to the slewing mechanism of the crane for transmission. Under normal operating conditions, the slewing motor 1112 outputs torque under the drive of the closed-loop slewing oil pump 1111, driving the slewing mechanism to perform slewing operations.

[0038] Furthermore, such as Figure 1 and Figure 2 As shown, the valve body of the second rotary control valve 115 forms two parallel internal oil passages. One end of each internal oil passage is connected to the oil tank 10, and the other end of each internal oil passage is connected to the oil inlet pipe of the rotary motor 1112 and the oil return pipe of the rotary motor 1112. When the second rotary control valve 115 is opened under the action of the main control oil, the oil inlet pipe and the oil return pipe of the rotary motor 1112 are connected through the second rotary control valve 115. At this time, the rotary motor 1112 is in a sliding state. When the rotary brake 112 is in a non-braking state, the rotary mechanism can slide freely under the drive of the rotary motor 1112, that is, the rotary mechanism enters a free floating state.

[0039] Specifically, the second rotary control valve 115 can be a hydraulically controlled check valve assembly, such as... Figure 1 and Figure 2 Example from the diagram. Both internal oil circuits of the hydraulically controlled check valve assembly are equipped with check valves. The main control oil circuit 14 is connected to the control end of the check valve, so that the pressure of the main control oil allows the two internal oil circuits to be unidirectionally open. Of course, the rotary second control valve 115 can also be a hydraulically controlled valve assembly, such as... Figure 4 In the example, the control end of the valve core of the hydraulic control valve assembly is connected to the main control oil circuit 14, and can make the two internal oil circuits open under the oil pressure of the main control oil.

[0040] In a further embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the hoisting mechanism 20 includes a hoisting drive mechanism 121, and the hoisting control subsystem 12 includes a hoisting control component 122 and a second hoisting control valve 123. The hoisting drive mechanism 121 is connected to the crane's boom via a transmission connection. The hoisting control component 122 is connected to the hoisting drive mechanism 121 via a pipeline to control the operation of the hoisting drive mechanism 121 through hydraulic oil, thereby driving the boom to perform normal hoisting or lowering operations. The two ends of the second hoisting control valve 123 are respectively connected to the inlet and return oil lines of the hoisting drive mechanism 121, and the control end of the second hoisting control valve 123 is connected to the main control oil circuit 14 via a pipeline. The second hoisting control valve 123 can be opened under the action of the main control oil in the main control oil circuit 14, so that the inlet and return oil lines of the hoisting drive mechanism 121 are connected, allowing the hoisting drive mechanism 121 and the boom to enter a free-floating state.

[0041] Furthermore, such as Figure 1 and Figure 2As shown, the lifting drive mechanism 121 specifically includes a boom lifting cylinder 1211. The piston rod of the boom lifting cylinder 1211 is connected to the lifting arm via a transmission connection. The rod chamber and rodless chamber of the boom lifting cylinder 1211 are respectively connected to the lifting control component 122 via pipelines, and the pipeline connected to the rod chamber is also connected to the oil tank 10. The lifting control component 122 can control the flow direction of the oil supplied to the boom lifting cylinder 1211 to control the extension or retraction of the piston rod of the boom lifting cylinder 1211. Under the control of the lifting control component 122, the boom lifting cylinder 1211 drives the lifting arm to lift or lower. Among them, the pipeline connected to the rod chamber of the boom-starting cylinder 1211 and the pipeline connected to the rodless chamber of the boom-starting cylinder 1211, one of which forms an oil inlet pipeline and the other forms an oil return pipeline; depending on the direction of the extension and retraction of the piston rod, the functions of the oil inlet pipeline and the oil return pipeline can be interchanged, that is, when the piston rod extends, the pipeline connected to the rod chamber is the oil return pipeline and the pipeline connected to the rodless chamber is the oil inlet pipeline; when the piston rod retracts, the pipeline connected to the rod chamber is the oil inlet pipeline and the pipeline connected to the rodless chamber is the oil return pipeline.

[0042] One end of the second hoisting control valve 123 is connected to the rod chamber of the boom lifting cylinder 1211 via a pipeline, and the other end is connected to the rodless chamber of the boom lifting cylinder 1211 via a pipeline. When the second hoisting control valve 123 is opened by the main control oil in the main control oil circuit 14, the rod chamber and the rodless chamber of the boom lifting cylinder 1211 are connected. At this time, the boom lifting cylinder 1211 and the lifting arm enter a free-floating state.

[0043] Specifically, the second lifting control valve 123 can be a hydraulically controlled check valve, such as... Figure 1 and Figure 2 In the example, the hydraulically controlled check valve can unidirectionally open under the oil pressure of the main control hydraulic fluid, so as to connect the rod-side and rodless-side chambers of the lifting cylinder; or, the second lifting control valve 123 can also be a hydraulically controlled valve, such as... Figure 4 In the example, the valve core of the hydraulic control valve can be opened under the oil pressure of the main control oil, so that the rod chamber and the rodless chamber of the boom cylinder 1211 are connected.

[0044] Furthermore, such as Figure 1 and Figure 2As shown, the hoisting control assembly 122 specifically includes a luffing balance valve 1221, a first hoisting control valve 1222, and a lowering control valve 1223. The luffing balance valve 1221 is located in the pipeline connecting the rodless chamber of the boom cylinder 1211, and the return port of the luffing balance valve 1221 is connected to the oil tank 10 through a pipeline. The first hoisting control valve 1222 is connected to the inlet of the luffing balance valve 1221 and the rod chamber of the boom cylinder 1211 through pipelines respectively; the first hoisting control valve 1222 is adapted to be connected to the oil supply equipment and can control the oil supply status of the boom cylinder 1211 in the oil supply equipment box, thereby controlling the extension or retraction of the piston rod of the boom cylinder 1211. The descent control valve 1223 is connected to the inside of the luffing balance valve 1221 through a pipeline. When the lifting cylinder 1211 is in normal working condition, the descent control valve 1223 controls the valve core of the luffing balance valve 1221 to switch so that the valve core position of the luffing balance valve 1221 matches the control operation of the first lifting control valve 1222.

[0045] Specifically, when the first hoisting control valve 1222 controls the supply of oil to the rodless chamber of the boom lifting cylinder 1211, the valve core of the luffing balance valve 1221 is switched to the oil inlet under the control of the descent control valve 1223, communicating with the rodless chamber of the boom lifting cylinder 1211, so that the oil can enter the rodless chamber to drive the piston rod to extend and drive the boom to perform hoisting operations; when the boom needs to be lowered, the valve core of the luffing balance valve 1221 is switched to the oil return port under the control of the descent control valve 1223, communicating with the rodless chamber of the boom lifting cylinder 1211. At this time, the piston rod of the boom lifting cylinder 1211 can retract under the gravity of the boom, or the first hoisting control valve 1222 controls the supply of oil to the rod chamber of the boom lifting cylinder 1211, and the piston rod of the boom lifting cylinder 1211 retracts under the gravity of the boom and the oil pressure of the rod chamber.

[0046] The following is a specific embodiment of the crane hydraulic control system 1 of the present invention:

[0047] like Figure 1 and Figure 2 As shown, the crane hydraulic control system 1 includes a slewing control subsystem 11, a hoisting control subsystem 12, a main control component 13, and a main control oil circuit 14. The crane hydraulic control system 1 can be applied to applications such as... Figure 3 The crane 2 shown in the figure has a hoisting mechanism 20, a slewing mechanism 22 and a boom 23.

[0048] like Figure 1 and Figure 2 As shown, the main control component 13 of the crane hydraulic control system 1 includes a main control valve 131, a detector 132, and an accumulator 133. One end of the main control valve 131 is connected to the input end of the main control oil circuit 14 via a pipeline, and the other end of the main control valve 131 is connected to the oil tank 10; when the main control valve 131 is open, as... Figure 2 In the current state, the main control oil flows directly back to the oil tank 10 through the main control valve 131. At this time, the slewing control subsystem 11 and the hoisting control subsystem 12 are in normal working condition. When the main control valve 131 is closed, such as Figure 1 In the current state, the main control oil enters the main control oil circuit 14 through the main control valve 131, and then flows to the slewing control subsystem 11 and the hoisting control subsystem 12, respectively, and acts on the slewing control subsystem 11 and the hoisting control subsystem 12, causing them to enter a free-floating state. This allows the slewing mechanism 22 and the hoisting mechanism 20 of the crane 2 to drive the boom 23 into a corresponding free-floating state. The main control valve 131 is a manual control valve, specifically a manual ball valve.

[0049] like Figure 1 and Figure 2 As shown, detector 132 is installed in the main control oil circuit 14 to detect the oil pressure of the main control oil in the main control oil circuit 14. This allows the operator to know whether control oil pressure has entered the main control oil circuit 14, and also to accurately determine whether the oil pressure in the main control oil circuit 14 meets the requirements, so that appropriate countermeasures can be taken in a timely manner when the oil pressure is abnormal. Specifically, detector 132 can be an oil pressure sensor; detector 132 can be directly connected to the pipeline of the main control oil circuit 14, or connected to the main control oil circuit 14 through a pipeline.

[0050] Accumulator 133 is connected to main control oil circuit 14 via pipeline. Accumulator 133 can perform oil replenishment or overflow operations on main control oil circuit 14 to balance the oil pressure in main control oil circuit 14. Specifically, when the oil pressure in main control oil circuit 14 is too high, a portion of the main control oil in main control oil circuit 14 can flow into accumulator 133 for storage, realizing an overflow operation to reduce the oil pressure in main control oil circuit 14; when the main control oil pressure in main control oil circuit 14 is too low, the control oil pressure stored in accumulator 133 can flow into main control oil circuit 14 to perform oil replenishment operation to increase the oil pressure in main control oil circuit 14.

[0051] like Figure 1 and Figure 2As shown, the slewing control subsystem 11 includes a slewing drive mechanism 111, a slewing brake 112, a shuttle valve 113, a first slewing control valve 114, and a second slewing control valve 115. The slewing drive mechanism 111 specifically includes a closed-loop slewing oil pump 1111 and a slewing motor 1112. The two working ports of the slewing motor 1112 are connected to the two ports of the closed-loop slewing oil pump 1111 via pipelines to form a closed loop. One pipeline connecting the two working ports of the slewing motor 1112 forms an inlet pipeline, and the other forms a return pipeline; the functions of the inlet and return pipelines can be interchanged depending on the direction of oil flow. The output end of the slewing motor 1112 is connected to the slewing mechanism 22 of the crane 2 for transmission. Under normal operating conditions, the slewing motor 1112 outputs torque under the drive of the closed-loop slewing oil pump 1111, driving the slewing mechanism 22 to perform slewing operations. The rotary brake 112 is provided in correspondence with the rotary motor 1112 to brake the rotary motor 1112. When the rotary brake 112 brakes the rotary motor 1112, the rotary mechanism 22 is locked and cannot perform a rotary operation.

[0052] One input port of shuttle valve 113 is connected to the main control oil circuit 14 via a pipeline, and the other input port of shuttle valve 113 is connected to the first rotation control valve 114 via a pipeline. The output port of shuttle valve 113 is connected to the rotation brake 112, so that shuttle valve 113 can be used to switch between the main control oil circuit 14 and the first rotation control valve 114 to control the rotation brake 112. Specifically, when the main control oil circuit 14 inputs main control oil to the rotation brake 112 through shuttle valve 113, the rotation brake 112 stops braking, and the rotation mechanism 22 is in an unlocked state. When the main control oil circuit 14 does not input main control oil to the rotation brake 112 through shuttle valve 113, the rotation motor 1112 is in normal working condition, and the rotation brake 112 operates under the control of the first rotation control valve 114.

[0053] like Figure 1 and Figure 2As shown, the second rotary control valve 115 specifically adopts a hydraulically controlled check valve assembly. The valve body of the second rotary control valve 115 forms two parallel internal oil circuits, each equipped with a check valve. One end of each internal oil circuit is connected to the oil tank 10, and the control ends of both check valves are connected to the main control oil circuit 14. At the other end of the two internal oil circuits, one circuit is connected to the inlet oil line of the rotary motor 1112, and the other is connected to the return oil line of the rotary motor 1112. When the second rotary control valve 115 is activated by the main control oil, the inlet and return oil lines of the rotary motor 1112 are connected through the second rotary control valve 115. At this time, the rotary motor 1112 is in a sliding state. When the rotary brake 112 is in a non-braking state, the rotary mechanism 22 can freely slide under the drive of the rotary motor 1112, that is, the rotary mechanism 22 enters a free-floating state.

[0054] like Figure 1 and Figure 2 As shown, the hoisting mechanism 20 includes a hoisting drive mechanism 121, and the hoisting control subsystem 12 includes a hoisting control component 122 and a second hoisting control valve 123; wherein, the hoisting drive mechanism 121 specifically includes a boom lifting cylinder 1211; the hoisting control component 122 specifically includes a luffing balance valve 1221, a first hoisting control valve 1222, and a boom lowering control valve 1223.

[0055] The piston rod of the boom cylinder 1211 is connected to the boom 23 of the crane 2 via a transmission connection; the rod chamber of the boom cylinder 1211 is connected to the oil tank 10 via a pipeline. The luffing balance valve 1221 is located in the pipeline connecting to the rodless chamber of the boom cylinder 1211, and the return port of the luffing balance valve 1221 is connected to the oil tank 10 via a pipeline. The first hoisting control valve 1222 is connected to the inlet of the luffing balance valve 1221 and the pipeline connecting to the rod chamber of the boom cylinder 1211 via pipelines; the first hoisting control valve 1222 is suitable for connecting to the oil supply equipment and can control the oil supply status of the boom cylinder 1211 in the oil supply equipment box, that is, the first hoisting control valve 1222 can control the oil supply to the rod chamber or the rodless chamber of the boom cylinder 1211, thereby controlling the extension or retraction of the piston rod of the boom cylinder 1211. The descent control valve 1223 is connected to the inside of the luffing balance valve 1221 through a pipeline. When the lifting cylinder 1211 is in normal working condition, the descent control valve 1223 controls the valve core of the luffing balance valve 1221 to switch so that the valve core position of the luffing balance valve 1221 matches the control operation of the first lifting control valve 1222.

[0056] Among them, the pipeline connected to the rod chamber of the boom cylinder 1211 and the pipeline connected to the rodless chamber of the boom cylinder 1211, one of which forms an oil inlet pipeline and the other forms an oil return pipeline; depending on the direction of the extension and retraction of the piston rod, the functions of the oil inlet pipeline and the oil return pipeline can be interchanged.

[0057] like Figure 1 and Figure 2 As shown, the second lifting control valve 123 is specifically a hydraulically controlled check valve. Both ends of the second lifting control valve 123 are connected to the inlet and return oil lines of the lifting drive mechanism 121, respectively, and the control end of the second lifting control valve 123 is connected to the main control oil circuit 14 via a pipeline. The second lifting control valve 123 can be opened under the action of the main control oil in the main control oil circuit 14, so that the rod chamber and rodless chamber of the boom lifting cylinder 1211 are connected, allowing the lifting drive mechanism 121 and the boom 23 to enter a free-floating state.

[0058] When the main control oil circuit 14 does not input main control oil to the second hoisting control valve 123, the second hoisting control valve 123 is in the closed state. At this time, the boom lifting cylinder 1211 is in normal working state. When the hoisting first control valve 1222 controls the supply of oil to the rodless chamber of the boom lifting cylinder 1211, the valve core of the luffing balance valve 1221 is switched to the oil inlet under the control of the descent control valve 1223, communicating with the rodless chamber of the boom lifting cylinder 1211, so that the oil can enter the rodless chamber to drive the piston rod to extend and drive the boom 23 to lift. When the boom 23 needs to be lowered, the valve core of the luffing balance valve 1221 is switched to the oil return port under the control of the descent control valve 1223, communicating with the rodless chamber of the boom lifting cylinder 1211. The piston rod of the boom lifting cylinder 1211 retracts under the gravity of the boom 23. Alternatively, the hoisting first control valve 1222 controls the supply of oil to the rod chamber of the boom lifting cylinder 1211, and the piston rod of the boom lifting cylinder 1211 retracts under the gravity of the boom 23 and the oil pressure in the rod chamber.

[0059] It should be noted that in another specific implementation of this embodiment, such as Figure 4 As shown, the main control valve 131 and the second hoisting control valve 123 can also be hydraulically controlled valves, and the second slewing control valve 115 can also be a hydraulically controlled valve assembly. It is also possible to achieve one-button control of the oil supply status in the main control oil circuit 14 via the main control valve 131, thereby enabling the second hoisting control valve 123 (using a hydraulically controlled valve) and the second slewing control valve 115 (using a hydraulically controlled valve assembly) to conduct under the action of the main control oil, thus allowing the slewing mechanism 22 and the hoisting mechanism to drive the boom 23 into a free-floating state.

[0060] When the crane 2 uses the crane hydraulic control system 1 in this embodiment, when the crane 2 is traveling and the external trailer 24 assists in carrying the boom 23, the main control valve 131 can control the crane 2's slewing mechanism 22 and lifting mechanism 20 to drive the boom 23 into a free-floating state so that it can move synchronously with the trailer 24 during travel. In particular, during road undulations or turns, it can match the travel trajectory of the crane 2's body 21 and the trailer 24.

[0061] In this embodiment, the crane hydraulic control system 1, through improvements and optimizations to the control method, utilizes the main control component 13 to perform unified control operations on the slewing control subsystem 11 and the hoisting control subsystem 12. This allows the slewing mechanism 22 and the hoisting mechanism 20 of the crane 2 to drive the boom 23 into a free-floating state, and enables one-button operation. This significantly simplifies the control operation process and steps, improves the efficiency of the control operation, and effectively prevents operators from missing individual operation steps during adjustment operations. This avoids the phenomenon that the crane 2 starts to travel before the slewing mechanism 22 and the hoisting mechanism 20 have fully entered the free state, which helps reduce the possibility of damage to the boom 23 and related mechanisms during travel and also helps reduce safety hazards.

[0062] In an embodiment of the second aspect of the invention, a crane 2 is also provided. For example... Figure 1 , Figure 3 and Figure 5 As shown, the crane 2 includes a car body 21, a slewing mechanism 22, a boom 23, a hoisting mechanism 20, and a crane hydraulic control system 1 as described in any of the embodiments of the first aspect. The slewing mechanism 22, the hoisting mechanism 20, and the boom 23 are all mounted on the car body 21 to enable movement with the car. The slewing mechanism 22 is rotatably connected to the car body 21 and can perform horizontal slewing operations relative to the car body 21. The boom 23 is mounted on and rotatably connected to the slewing mechanism 22 and can perform slewing operations relative to the car body 21 together with the slewing mechanism 22. The hoisting mechanism 20 is driveably connected to the boom 23 and can drive the boom 23 to perform vertical lifting or lowering operations relative to the slewing mechanism 22. The slewing control subsystem 11 of the crane hydraulic control system 1 is connected to the slewing mechanism 22 to drive the slewing mechanism 22 to perform horizontal slewing motion; the hoisting control subsystem 12 of the crane hydraulic control system 1 is connected to the hoisting mechanism 20 to drive the boom 23 to perform hoisting or lowering operations.

[0063] When the crane 2 is traveling and the external trailer 24 assists in supporting the boom 23, the crane 2's slewing mechanism 22 and lifting mechanism 20 can be controlled by the main control component 13 of the crane's hydraulic control system 1 to drive the boom 23 into a free-floating state, so that it can move synchronously with the trailer 24 during travel. In particular, it can match the travel trajectory of the crane 2's body 21 and the trailer 24 during road undulations or turns.

[0064] Furthermore, in this embodiment, the lifting boom 23 can be a telescopic lifting boom; the slewing mechanism 22 can specifically be a turntable.

[0065] Furthermore, in this embodiment, the crane 2 may also include a trailer 24, such as... Figure 3 As shown, the trailer 24 is flexibly connected to the rear of the crane body 21, allowing it to travel alongside the crane body 21 under its traction. The rear of the boom 23 extends from the rear of the body 21 and is supported by the trailer 24, reducing the bridge load on the crane 2. The body 21 and trailer 24 can rotate relative to each other in both the horizontal and vertical directions to adapt to uneven road surfaces and the turning operations of the body 21. During travel, the boom 23, slewing mechanism 22, and lifting mechanism 20 are all in a free-floating state, moving synchronously with the trailer 24.

[0066] Furthermore, the crane 2 in this embodiment also has all the beneficial effects of the crane hydraulic control system 1 in any of the embodiments of the first aspect described above, which will not be repeated here.

[0067] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0068] The block diagrams of the devices, apparatuses, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it. It should also be noted that in the apparatuses and devices of this invention, the components can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the invention.

[0069] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0070] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features of the invention herein.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic control system for a crane having a hoisting mechanism (20), a slewing mechanism (22), and a boom (23), the boom (23) being rotatably connected to the slewing mechanism (22), a portion of the boom (23) extending outward from the crane body (21) and adapted to be supported on an auxiliary support device, characterized in that, The crane hydraulic control system includes: A slewing control subsystem (11) is adapted to be connected to the slewing mechanism (22) to drive the boom (23) to rotate; A lifting control subsystem (12) is adapted to be connected to the lifting mechanism (20) to drive the lifting boom (23) to lift or lower. The main control component (13) is connected to the slewing control subsystem (11) and the hoisting control subsystem (12) via the main control oil circuit (14). The main control component (13) can control the oil supply status of the main control oil circuit (14) to control the slewing control subsystem (11) and the hoisting control subsystem (12) to adjust their status between normal operation and free floating. The main control component (13) includes a main control valve (131). One end of the main control valve (131) is connected to the input end of the main control oil circuit (14) via a pipeline, and the other end of the main control valve (131) is connected to the oil tank. The main control valve (131) can control the main control oil to flow into the main control oil circuit (14) or into the oil tank. Among them, the free floating state is the state in which the slewing mechanism (22) rotates freely around the slewing center and the lifting mechanism (20) drives the crane arm to rise or fall freely around the slewing center.

2. The crane hydraulic control system according to claim 1, characterized in that, The main control component (13) also includes: A detector (132) is provided in the main control oil circuit (14), and the detector (132) is adapted to detect the oil pressure in the main control oil circuit (14); An accumulator (133) is connected to the main control oil circuit (14) through a pipeline. The accumulator (133) is adapted to perform oil replenishment or overflow operations on the main control oil circuit (14). The main control valve (131) is either a manual control valve or a hydraulic control valve.

3. The crane hydraulic control system according to any one of claims 1 to 2, characterized in that, The slewing control subsystem (11) includes: A rotary drive mechanism (111) is connected to the rotary mechanism (22) in a transmission manner; A rotary brake (112) is provided corresponding to the rotary drive mechanism (111), and the rotary brake (112) can perform braking operation on the rotary drive mechanism (111); A shuttle valve (113) has one input port connected to the main control oil circuit (14) via a pipeline, and the output port of the shuttle valve (113) is connected to the rotary brake (112). The first control valve (114) for rotation is connected to another input port of the shuttle valve (113) through a pipeline. The rotation brake (112) can adjust its working state under the action of the oil in the first control valve (114) for rotation or under the action of the main control oil in the main control oil circuit (14). A second rotary control valve (115) is provided. One end of the second rotary control valve (115) is connected to the oil tank, and the other end is connected to the oil inlet and return lines of the rotary drive mechanism (111). The control end of the second rotary control valve (115) is connected to the main control oil circuit (14) and can be opened under the action of the main control oil to connect the oil inlet and return lines of the rotary drive mechanism (111).

4. The crane hydraulic control system according to claim 3, characterized in that, The rotary drive mechanism (111) includes: Closed-loop rotary oil pump (1111). A rotary motor (1112) has two working oil ports connected to the two oil ports of the closed rotary oil pump (1111) via pipelines. One of the two pipelines connecting the two working oil ports of the rotary motor (1112) forms an oil inlet pipeline, and the other forms an oil return pipeline. The output end of the rotary motor (1112) is connected to the rotary mechanism (22) for transmission.

5. The crane hydraulic control system according to claim 4, characterized in that, The second rotary control valve (115) forms two parallel internal oil circuits. One end of each of the two internal oil circuits is connected to the oil tank, and the other end of each of the two internal oil circuits is connected to the oil inlet pipe and the oil return pipe of the rotary motor (1112), respectively. The rotary second control valve (115) is a hydraulically controlled check valve group or a hydraulically controlled valve group.

6. The crane hydraulic control system according to any one of claims 1 to 2, characterized in that, The lifting mechanism (20) includes: The lifting drive mechanism (121) is connected to the lifting arm (23) in a transmission manner; The hoisting control subsystem (12) includes: The hoisting control assembly (122) is connected to the hoisting drive mechanism (121) via a pipeline, and the hoisting control assembly (122) is adapted to control the operation of the hoisting drive mechanism (121); The second lifting control valve (123) is connected at both ends to the oil inlet and oil return lines of the lifting drive mechanism (121) via pipelines. The control end of the second lifting control valve (123) is connected to the main control oil circuit (14) via a pipeline. The second lifting control valve (123) can be opened under the action of the main control oil in the main control oil circuit (14) so ​​that the oil inlet and oil return lines of the lifting drive mechanism (121) are connected.

7. The crane hydraulic control system according to claim 6, characterized in that, The lifting drive mechanism (121) includes: The boom lifting cylinder (1211) is connected to the boom (23) via a transmission. The rod chamber and rodless chamber of the boom lifting cylinder (1211) are respectively connected to the lifting control assembly (122) through pipelines. The pipeline connecting the rod chamber of the boom lifting cylinder (1211) and the pipeline connecting the rodless chamber of the boom lifting cylinder (1211) form an oil inlet pipeline and the other forms an oil return pipeline. One end of the second lifting control valve (123) is connected to the rod chamber of the boom lifting cylinder (1211) via a pipeline, and the other end of the second lifting control valve (123) is connected to the rodless chamber of the boom lifting cylinder (1211) via a pipeline. The control end of the second lifting control valve (123) is connected to the main control oil circuit (14) via a pipeline. The second lifting control valve (123) is a hydraulic check valve or a hydraulic control valve.

8. The crane hydraulic control system according to claim 7, characterized in that, The lifting control assembly (122) includes: A variable amplitude balance valve (1221) is provided in the pipeline connecting the rodless chamber of the boom cylinder (1211), and the return port of the variable amplitude balance valve (1221) is connected to the oil tank through the pipeline. The first hoisting control valve (1222) is connected to the oil inlet of the luffing balance valve (1221) and the rod chamber of the luffing cylinder (1211) via pipelines. The first hoisting control valve (1222) is adapted to be connected to the oil supply equipment and can control the oil supply status to the luffing cylinder (1211). A drop control valve (1223) is connected to the interior of the amplitude balance valve (1221) via a pipeline. The drop control valve (1223) is adapted to control the valve core switching of the amplitude balance valve (1221).

9. A crane, characterized in that, include: Vehicle body (21); A slewing mechanism (22) is rotatably mounted on the vehicle body (21); The lifting boom (23) is rotatably connected to the slewing mechanism (22), and part of the lifting boom (23) extends outward from the vehicle body (21) and is adapted to be carried on an auxiliary bearing device; A lifting mechanism (20) is provided on the vehicle body (21). The lifting mechanism (20) is connected to the lifting arm (23) and is adapted to drive the lifting arm (23) to lift or lower. The crane hydraulic control system as described in any one of claims 1 to 8 is mounted on the vehicle body (21); in, The slewing control subsystem (11) is connected to the slewing mechanism (22) and the hoisting control subsystem (12) is connected to the hoisting mechanism (20).

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