AU2023285987A1 - Crane hydraulic control system and crane - Google Patents

Crane hydraulic control system and crane Download PDF

Info

Publication number
AU2023285987A1
AU2023285987A1 AU2023285987A AU2023285987A AU2023285987A1 AU 2023285987 A1 AU2023285987 A1 AU 2023285987A1 AU 2023285987 A AU2023285987 A AU 2023285987A AU 2023285987 A AU2023285987 A AU 2023285987A AU 2023285987 A1 AU2023285987 A1 AU 2023285987A1
Authority
AU
Australia
Prior art keywords
oil
hoisting
slewing
control
main control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
AU2023285987A
Inventor
Liyun ZHOU
Xinglong ZOU
Yanhu ZOU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Sany Medium Lifting Machinery Co Ltd
Original Assignee
Hunan Sany Medium Tonnage Hoisting Machinery Co Ltd
Hunan Sany Medium Lifting Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Sany Medium Tonnage Hoisting Machinery Co Ltd, Hunan Sany Medium Lifting Machinery Co Ltd filed Critical Hunan Sany Medium Tonnage Hoisting Machinery Co Ltd
Publication of AU2023285987A1 publication Critical patent/AU2023285987A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/20—Control systems or devices for non-electric drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/42—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes with jibs of adjustable configuration, e.g. foldable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/82—Luffing gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/84—Slewing gear
    • B66C23/86—Slewing gear hydraulically actuated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Jib Cranes (AREA)

Abstract

The present application belongs to the technical field of hydraulic systems, and particularly relates to a crane hydraulic control system and a crane. The crane hydraulic control system includes: a slewing control subsystem configured to be in transmission connected with the slewing mechanism; a hoisting control subsystem configured to be in transmission connected a hoisting mechanism; and a main control assembly connecting with the slewing control subsystem and the hoisting control subsystem through a main control oil circuit, the main control assembly is configured to control oil supply status of the main control oil circuit to control the slewing control subsystem and the hoisting control subsystem to switch between a normal working state and a free floating state. According to the technical solution of the present application, the boom can enter a free floating state through the slewing control subsystem and the hoisting control subsystem, the operation process is simple and convenient, and can achieve a one-button operation effect, which can effectively prevent the operator from missing operating steps, and can effectively reduce safety hazards when driving with an external trailer carrying the boom.

Description

CRANE HYDRAULIC CONTROL SYSTEM AND CRANE CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to Chinese Patent Application No. 202211329157.X, entitled "CRANE HYDRAULIC CONTROL SYSTEM AND CRANE", filed with China National Intellectual Property Administration, and filed on October 27, 2022, the entire contents of which are incorporated herein by reference.
TECHNICAL FIELD
[0002] The present application belongs to the technical field of hydraulic systems, and specifically relates to a crane hydraulic control system and a crane.
BACKGROUND
[0003] In the field of cranes, as the axle load of the crane increases, some cranes adopt the method of attaching an external trailer behind the vehicle body to carry the boom, thereby reducing the axle load during the driving of the crane. The external trailer is flexibly connected to the vehicle body of the crane, and the slewing mechanism and hoisting mechanism of the boom need to be in a free floating state so that the boom can move accordingly with the external trailer when the road rises and falls or turns.
[0004] In the existing crane hydraulic system, due to the complicated connection relationship and control strategy, and the slewing mechanism and hoisting mechanism are usually independent of each other, if the slewing mechanism and the hoisting mechanism are to achieve a free floating state at the same time, corresponding control operations need to be performed on the slewing mechanism and the hoisting mechanism respectively, which results in the need to perform different control operations on multiple different components before the crane drives, and the operation process is complicated and easy to cause omissions. Once a certain control operation step is omitted, the slewing mechanism and the hoisting mechanism cannot completely enter the free floating state. When the crane is driving in this state, it is very easy to cause damage to the boom and related mechanisms, and at the same time, there exists certain safety hazards and it is easy to cause safety accidents during driving.
SUMMARY
[0005] In view of this, in order to improve at least one of the above-mentioned problems existing in the prior art, the present application provides a crane hydraulic control system and a crane.
[0006] A first aspect of the present application provides a crane hydraulic control system for a crane provided with a hoisting mechanism, a slewing mechanism and a boom. The crane hydraulic control system includes: a slewing control subsystem configured to be transmission connected with the slewing mechanism to drive the boom to rotate; a hoisting control subsystem configured to be transmission connected with a boom to drive the boom to hoist or lower; and a main control assembly connecting with the slewing control subsystem and the hoisting control subsystem through a main control oil circuit, the main control assembly is configured to control oil supply status of the main control oil circuit to control the slewing control subsystem and the hoisting control subsystem to switch between a normal working state and a free floating state.
[0007] The beneficial effects of the above technical solution of the present application are reflected in:
[0008] the overall connection relationship and control logic of the system have been improved and optimized, and the status of the slewing control subsystem and the hoisting control subsystem can be adjusted through the main control assembly, and it can make the slewing control subsystem and the hoisting control subsystem enter the free floating state at the same time, so that when the crane drives through the external trailer carrying the boom, the boom can move accordingly with the trailer; at the same time, only one-time control operation of the main control assembly is required, the operation process is simple and convenient, and it can achieve a one-button operation effect, which can effectively prevent the operator from missing operating steps, thus greatly reducing the possibility of the boom not fully entering a free floating state while the crane is driving, and also reducing potential safety hazards during driving.
[0009] In a possible implementation, the main control assembly includes: a main control valve, one end of the main control valve is connected to an input end of the main control oil circuit through a pipeline, another end of the main control valve is connected to an oil tank, and the main control valve is configured to control main control oil to flow into the main control oil circuit or flow into the oil tank.
[0010] In a possible implementation, the main control assembly further includes: a detector located in the main control oil circuit and configured to detect an oil pressure in the main control oil circuit; an energy accumulator configured to be connected to the main control oil circuit through a pipeline and configured to perform an oil replenishment operation or an overflow operation on the main control oil circuit; and the main control valve is a manual control valve or a hydraulic control valve.
[0011] In a possible implementation, the slewing control subsystem includes: a slewing driving mechanism configured to be transmission connected with the slewing mechanism; a slewing brake provided corresponding to the slewing driving mechanism and configured to perform a braking operation on the slewing driving mechanism; a shuttle valve, an input oil port of the shuttle valve connects with the main control oil circuit through a pipeline, and an output oil port of the shuttle valve connects with the slewing brake; a slewing first control valve connecting with another input oil port of the shuttle valve through a pipeline, and the slewing brake is configured to adjust a working state under action of oil in the slewing first control valve or action of main control oil in the main control oil circuit; and a slewing second control valve, one end of the slewing second control valve connects with an oil tank, and another end of the slewing second control valve connects with an oil inlet pipeline of the slewing driving mechanism and an oil return pipeline of the slewing driving mechanism, a control end of the slewing second control valve connects with the main control oil circuit and is configured to be conducted under action of the main control oil to connect the oil inlet pipeline of the slewing driving mechanism and the oil return pipeline of the slewing driving mechanism.
[0012] In a possible implementation, the slewing driving mechanism includes: a closed rotary oil pump; and a swing motor, two working oil ports of the swing motor respectively connect to two oil ports of the closed rotary oil pump through pipelines; two pipelines connecting the two working oil ports of the swing motor, one of which forms an oil inlet pipeline and the other forms an oil return pipeline; and an output end of the swing motor is transmission connected with the slewing mechanism.
[0013] In a possible implementation, two internal oil circuits provided in parallel are formed in the slewing second control valve, one end of the two internal oil circuits both connect to the oil tank, another end of the two internal oil circuits respectively connect to the oil inlet pipeline of the swing motor and the oil return pipeline of the swing motor; and the slewing second control valve is a hydraulic control one-way valve group or a hydraulic control valve group.
[0014] In a possible implementation, the hoisting mechanism includes: a hoisting driving mechanism configured to be transmission connected to the boom; the hoisting control subsystem includes: a hoisting control assembly connecting with the hoisting driving mechanism through a pipeline, and the hoisting control assembly is configured to control the hoisting driving mechanism to work; a hoisting second control valve, both ends of the hoisting second control valve respectively connect to an oil inlet pipeline of the hoisting driving mechanism and an oil return pipeline of the hoisting driving mechanism through pipelines, a control end of the hoisting second control valve connects with the main control oil circuit through a pipeline, and the hoisting second control valve is configured to be conducted under action of main control oil in the main control oil circuit to connect the oil inlet pipeline of the hoisting driving mechanism and the oil return pipeline of the hoisting driving mechanism.
[0015] In a possible implementation, the hoisting driving mechanism includes: a lifting oil cylinder being transmission connected to the boom, a rod cavity of the lifting oil cylinder and a rodless cavity of the lifting oil cylinder respectively connect to the hoisting control assembly through pipelines; the pipeline connecting the rod cavity of the lifting oil cylinder and the pipeline connecting the rodless cavity of the lifting oil cylinder, one of which forms an oil inlet pipeline and the other forms an oil return pipeline; one end of the hoisting second control valve is connected to the pipeline connecting the rod cavity of the lifting oil cylinder through a pipeline, and another end of the hoisting second control valve is connected to the pipeline connecting the rodless cavity of the lifting oil cylinder through a pipeline, the control end of the hoisting second control valve connects with the main control oil circuit through a pipeline; and the hoisting second control valve is a hydraulic control one-way valve or a hydraulic control valve.
[0016] In a possible implementation, the hoisting control assembly includes: a luffing balance valve located in the pipeline connecting the rodless cavity of the lifting oil cylinder, and an oil return port of the luffing balance valve connects with an oil tank through a pipeline; a hoisting first control valve respectively connecting with an oil inlet of the luffing balance valve and the rod cavity of the lifting oil cylinder through pipelines, the hoisting first control valve is configured to connect an oil supply equipment and is configured to control oil supply status of the lifting oil cylinder; and a lowering control valve connected to an interior of the luffing balance valve through a pipeline, and the lowering control valve is configured to control a valve core reversing of the luffing balance valve.
[0017] A second aspect according to the present application further provides a crane, including: a vehicle body; a slewing mechanism rotatably provided on the vehicle body; a boom rotatably connecting with the slewing mechanism, part of the boom is configured to extend outward from the vehicle body and is configured to be carried on an auxiliary carrying device; a hoisting mechanism provided on the vehicle body, the hoisting mechanism is transmission connected with the boom and is configured to drive the boom to hoist or lower; the crane hydraulic control system in any implementation of the first aspects above, the crane hydraulic control system is provided on the vehicle body; and the slewing control subsystem is transmission connected with the slewing mechanism, and the hoisting control subsystem is transmission connected with the hoisting mechanism.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 shows a schematic view of a crane hydraulic control system provided by an embodiment according to the present application.
[0019] FIG. 2 shows a schematic view of a crane hydraulic control system provided by an embodiment according to the present application.
[0020] FIG. 3 shows a schematic view of a crane provided by an embodiment according to the present application.
[0021] FIG. 4 shows a schematic view of a crane hydraulic control system provided by an embodiment according to the present application.
[0022] FIG. 5 shows a schematic view diagram of a crane provided by an embodiment according to the present application.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] In the description of the present application, "plurality" means at least two, that is, two, three, and so on, unless otherwise expressly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back or the like) are only used to explain the relative positional relationship, movement and so on between various components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprise", "have" or any other variation thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally includes other steps or units that are inherent to the process, method, product or apparatus.
[0024] In addition, reference to "embodiment" herein means that particular features, structures, or characteristics described in conjunction with embodiments may be included in at least an embodiment according to the present application. The presence of the phrase at various points in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood by those skilled in the art, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
[0025] The technical solutions in the embodiments according to the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments according to the present application, and it is clear that the described embodiments are only a part of the embodiments according to the present application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without making creative labor fall within the scope of this application.
[0026] Some embodiments of a crane hydraulic control system and a crane in the technical solution according to the present application are provided below.
[0027] In an embodiment of a first aspect of the present application, a crane hydraulic control system 1 is provided. As shown in FIG. 1 and FIG. 2, the crane hydraulic control system 1 includes a slewing control subsystem 11, a hoisting control subsystem 12, a main control assembly 13 and a main control oil circuit 14, and the crane hydraulic control system 1 can be applied to cranes having a hoisting mechanism 20, a slewing mechanism and a boom.
[0028] As shown in FIG. 1 and FIG. 2, the main control assembly 13 connects with the slewing control subsystem 11 and the hoisting control subsystem 12 through the main control oil circuit 14, and the main control assembly 13 is capable of controlling oil supply status of the main control oil circuit 14. When assembled in a crane, as exemplified in FIG. 3, the slewing control subsystem 11 is transmission connected to the slewing mechanism of the crane to drive the slewing mechanism to perform slewing operation with respect to the vehicle body of the crane, which in turn drives the boom to rotate with respect to the vehicle body of the crane; and the hoisting control subsystem 12 is transmission connected to the hoisting mechanism 20 of the crane to drive the boom to perform hoisting operation or descending operation with respect to the vehicle body of the crane through the hoisting mechanism 20. The main control assembly 13 controls the oil supply status of the main control oil circuit 14, that is, controls whether the main control oil flows into the main control oil circuit, in order to adjust the state of the slewing control subsystem 11 and the hoisting control subsystem 12, so that the slewing control subsystem 11 and the hoisting control subsystem 12 switch between a normal working state and a free floating state, thus making the corresponding slewing mechanism and the hoisting mechanism 20 switch between a normal working state and a free floating state, thereby causing the boom to switch between a normal working state and a free floating state.
[0029] It should be noted that the free floating state refers specifically to a state in which the slewing mechanism can rotate freely around the center of rotation and the hoisting mechanism drives the boom to hoist or lower freely around the center of rotation.
[0030] When the main control assembly 13 causes the main control oil to flow into the main control oil circuit 14, the main control oil is able to flow to the slewing control subsystem 11 and the hoisting control subsystem 12 through the main control oil circuit 14 to act on the slewing control subsystem 11 and the hoisting control subsystem 12, thus causing the slewing mechanism and the hoisting mechanism 20 to enter into a free floating state; when the main control assembly 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 supply of oil 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 a normal working state and perform a normal slewing operation and hoisting operation or lowering operation.
[0031] It can be understood that in order to reduce the axle load of the crane in the driving process, the practical application usually adopts the way of external trailer at the rear of the vehicle body of the crane in order to assist in carrying the boom, the external trailer is flexibly connected to the vehicle body of the crane, and accordingly, the slewing mechanism and hoisting mechanism of the boom need to be in a free floating state so that the boom can move accordingly with the external trailer when the road rises and falls or turns. However, the existing crane hydraulic system has lot of control steps for state adjustment, and the operation process is complicated, thus it is easy for the operator to miss the operation steps when operating at the construction site.
[0032] The crane hydraulic control system 1 in this embodiment uses the main control assembly 13 to perform unified control operations on the slewing control subsystem 11 and the hoisting control subsystem 12 by improving and optimizing the control method, so that the slewing mechanism and the hoisting mechanism 20 of the crane can drive the boom to enter into a free floating state, and can realize the effect of one-button operation, which greatly simplifies the process and steps of the control operation and improves the efficiency of the control operation, moreover, it can effectively prevent the operator from omitting individual operation steps when performing adjustment operations, thereby avoiding the phenomenon that the crane starts driving before the slewing mechanism and the hoisting mechanism 20 are completely in a free state, which will help reduce the possibility of damage to the boom and related mechanisms during driving, and also help to reduce potential safety hazards.
[0033] In a further embodiment of the present application, as shown in FIG. 1 and FIG. 2, the main control assembly 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 an input end of the main control oil circuit 14 through a pipeline, and another end of the main control valve 131 is connected to an oil tank; when the main control valve 131 is conducted, as shown in FIG. 2, the main control oil directly flows back to the oil tank 10 through the main control valve 131, at this time, the main control oil is not supplied to the slewing control subsystem 11 and the hoisting control subsystem 12, the slewing control subsystem 11 and the hoisting control subsystem 12 are in normal working condition; when the main control valve 131 is closed, as shown in FIG. 1, 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, and respectively acts on the slewing control subsystem 11 and the hoisting control subsystem 12, thus making 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 into a free floating state accordingly.
[0034] It should be noted that the main control valve 131 can also be directly provided at the input end of the main control oil circuit 14, and the main control oil is controlled to flow into the main control oil circuit 14 or the main control oil is prevented from flowing into the main control oil circuit 14 through the opening operation and closing operation of the main control valve 131.
[0035] Furthermore, as shown in FIG. 1 and FIG. 2, the main control assembly 13 also includes a detector 132 and an energy accumulator 133. The detector 132 is located in the main control oil circuit 14 to detect an oil pressure 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 oil pressure 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 the control oil pressure enters the main control oil circuit 14, and can also accurately know whether the oil pressure in the main control oil circuit 14 meets the requirements, so that corresponding countermeasures can be taken in time when the oil pressure is abnormal. Specifically, the detector 132 can be an oil pressure sensor or other sensor device that can detect oil pressure. The detector 132 can be directly connected to the pipeline of the main control oil circuit 14, or can be connected to the main control oil circuit 14 through the pipeline.
[0036] The energy accumulator 133 connects with the main control oil circuit 14 through a pipeline and can perform an oil replenishment operation or an overflow operation on the main control oil circuit 14 to balance the oil pressure in the main control oil circuit 14. Specifically, when the oil pressure in the main control oil circuit 14 is too high, a part of the main control oil in the main control oil circuit 14 can flow into the energy accumulator 133 for storage, thereby realizing an overflow operation to reduce the oil pressure in the main control oil circuit 14; when the main control oil circuit 14 is too low, the control oil pressure stored in the energy accumulator 133 can flow into the main control oil circuit 14 to implement oil replenishment operation to increase the oil pressure in the main control oil circuit 14.
[0037] In a further embodiment of the present application, as shown in FIG. 1 and FIG. 2, 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 slewing first control valve 114 and a slewing second control valve 115. The slewing driving mechanism 111 is transmission connected with the slewing mechanism 22 of the crane; the slewing brake 112 is provided corresponding to the slewing driving mechanism 111 to perform a braking operation on the slewing driving mechanism 111, when the slewing driving mechanism 111 is in the braking state, the slewing mechanism is locked and cannot perform the slewing operation. An input oil port of the shuttle valve 113 connects with the main control oil circuit 14 through a pipeline, another input oil port of the shuttle valve 113 connects with the slewing first control valve 114 through a pipeline, and an output oil port of the shuttle valve 113 connects with the slewing brake 112, so that the shuttle valve 113 is configured to switch the main control oil circuit 14 or the slewing first control valve 114 to perform control operation of slewing brake 112. When the main control oil circuit 14 inputs the main control oil to the slewing brake 112 through the shuttle valve 113, the slewing brake 112 stops the braking operation, and at this time the slewing mechanism is in an unlocked state; when the main control oil circuit 14 does not input main control oil to the slewing brake 112 through the shuttle valve 113, the swing motor 1112 is in normal working condition, the slewing brake 112 works under the control of the slewing first control valve 114. In addition, one end of the slewing second control valve 115 connects with an oil tank 10, and another end of the slewing second control valve 115 connects with an oil inlet pipeline of the slewing driving mechanism 111 and an oil return pipeline of the slewing driving mechanism 111, a control end of the slewing second control valve 115 connects with the main control oil circuit 14; when the main control oil in the main control oil circuit 14 flows into the slewing second control valve 115, the slewing second control valve 115 is conducted, and the oil inlet pipeline of the slewing driving mechanism 111 and the oil return pipeline of the slewing driving mechanism 111 are connected, so that the pressures in the oil inlet pipeline of the slewing driving mechanism 111 and the oil return pipeline of the slewing driving mechanism 111 are kept balanced. When the slewing brake 112 is in the non-braking state and the slewing second control valve 115 is in the conducting state, the slewing drive mechanism 111 enters the free floating state, and the slewing mechanism of the crane also enters the free floating state accordingly.
[0038] Furthermore, as shown in FIG. 1 and FIG. 2, the slewing driving mechanism 111 specifically includes a closed rotary oil pump 1111 and a swing motor 1112. Two working oil ports of the swing motor 1112 respectively connect with two oil ports of the closed rotary oil pump 1111 through pipelines to form a closed circuit. Two pipelines connecting the two working oil ports of the swing motor 1112, one of which forms an oil inlet pipeline and the other forms an oil return pipeline. It can be understood that depending on the flow direction of oil, the function of the oil inlet pipeline and the function of the oil return pipeline can be interchanged. An output end of the swing motor 1112 is transmission connected with the slewing mechanism 22, so that under normal working conditions, the swing motor 1112 outputs torque driven by the closed rotary oil pump 1111 to drive the slewing mechanism to perform slewing operation.
[0039] Furthermore, as shown in FIG. 1 and FIG. 2, two internal oil circuits provided in parallel are formed in the valve body of the slewing second control valve 115, one end of the two internal oil circuits both connect with the oil tank 10; and as for another end of the two internal oil circuits, one internal oil circuit connects with the oil inlet pipeline of the swing motor 1112 and the other internal oil circuit connects with the oil return pipeline of the swing motor 1112. When the slewing second control valve 115 is conducted under the action of the main control oil, the oil inlet pipeline of the swing motor 1112 and the oil return pipeline of the swing motor 1112 are connected through the slewing second control valve 115, at this time, the swing motor 1112 is in a sliding and rotating state. When the slewing brake 112 is in a non-braking state, the slewing mechanism can freely slide and rotate driven by the swing motor 1112, that is, the slewing mechanism enters a free floating state.
[0040] Specifically, the slewing second control valve 115 can be a hydraulic control one-way valve group, as shown in the examples in FIG. 1 and FIG. 2. The two internal oil circuits of the hydraulic control one-way valve group are both equipped with one-way valve, the main control oil circuit 14 connects with the control end of the one-way valve to make the two internal oil circuits conduct one-way through the pressure of the main control oil. Certainly, the slewing second control valve 115 can also be a hydraulic control valve group, as shown in the example in FIG. 4, the control end of the valve core of the hydraulic control valve group connects with the main control oil circuit 14 and can connect two internal oil circuits under the action of the oil pressure of the main control oil.
[0041] In a further embodiment according to the present application, as shown in FIG. 1 and FIG. 2, the hoisting mechanism 20 includes a hoisting driving mechanism 121, the hoisting control subsystem 12 includes a hoisting control assembly 122 and a hoisting second control valve 123. The hoisting driving mechanism 121 is transmission connected to the boom of the crane. The hoisting control assembly 122 connects to the hoisting driving mechanism 121 through a pipeline to control the operation of the hoisting driving mechanism 121 through hydraulic oil to drive the boom to perform normal hoisting operation or lowering operation. Both ends of the hoisting second control valve 123 respectively connect with an oil inlet pipeline of the hoisting driving mechanism 121 and an oil return pipeline of the hoisting driving mechanism 121 through pipelines, a control end of the hoisting second control valve 123 connects with the main control oil circuit 14 through a pipeline; the hoisting second control valve 123 can be conducted under action of main control oil in the main control oil circuit 14 to connect the oil inlet pipeline of the hoisting driving mechanism 121 and the oil return pipeline of the hoisting driving mechanism 121, so that the hoisting driving mechanism 121 and the boom enter a free floating state.
[0042] Furthermore, as shown in FIG. 1 and FIG. 2, the hoisting driving mechanism 121 specifically includes a lifting oil cylinder 1211, a piston rod of the lifting oil cylinder 1211 is transmission connected to the boom, a rod cavity of the lifting oil cylinder 1211 and a rodless cavity of the lifting oil cylinder 1211 respectively connect with the hoisting control assembly 122 through pipelines, and the pipeline connecting with the rod cavity also connects with the oil tank ; the hoisting control assembly 122 can control the flow direction of oil supplied to the lifting oil cylinder 1211 to control the extension or contraction of the piston rod of the lifting oil cylinder 1211; the lifting oil cylinder 1211 drives the boom to hoist or lower under the control of the hoisting control assembly 122. The pipeline connecting with the rod cavity of the lifting oil cylinder 1211 and the pipeline connecting with the rodless cavity of the lifting oil cylinder 1211, one of which forms an oil inlet pipeline and the other forms an oil return pipeline. According to the different directions of extension movement and contraction movement of the piston rod, the function of the oil inlet pipeline and the function of the oil return pipeline can be interchanged, that is, when the piston rod extends, the pipeline connecting with the rod cavity is the oil return pipeline, and the pipeline connecting with the rodless cavity is the oil inlet pipeline; when the piston rod contracts, the pipeline connecting with the rod cavity is the oil inlet pipeline, and the pipeline connecting with the rodless cavity is the oil return pipeline.
[0043] One end of the hoisting second control valve 123 is connected to the pipeline connecting the rod cavity of the lifting oil cylinder 1211 through a pipeline, and another end of the hoisting second control valve 123 is connected to the pipeline connecting the rodless cavity of the lifting oil cylinder 1211 through a pipeline. When the hoisting second control valve 123 is conducted under the action of the main control oil in the main control oil circuit 14, the rod cavity of the lifting oil cylinder 1211 and the rodless cavity of the lifting oil cylinder 1211 are connected, at this time, the lifting oil cylinder 1211 and the boom enter a free floating state.
[0044] Specifically, the hoisting second control valve 123 can be a hydraulic control one-way valve, as shown in the examples in FIG. 1 and FIG. 2, the hydraulic control one-way valve can conduct one-way conduction under the action of the oil pressure of the main control oil, so that the rod cavity of the lifting oil cylinder 1211 and the rodless cavity of the lifting oil cylinder 1211 are connected. Alternatively, the hoisting second control valve 123 can also be a hydraulic control valve, as shown in the example in FIG. 4, the valve core of the hydraulic control valve can be conducted under the action of the oil pressure of the main control oil, so that the rod cavity of the lifting oil cylinder 1211 and the rodless cavity of the lifting oil cylinder 1211 are communicated with each other.
[0045] Furthermore, as shown in FIG. 1 and FIG. 2, the hoisting control assembly 122 specifically includes a luffing balance valve 1221, a hoisting first control valve 1222 and a lowering control valve 1223. The luffing balance valve 1221 is located in the pipeline connecting the rodless cavity of the lifting oil cylinder 1211, and an oil return port of the luffing balance valve 1221 is connected to an oil tank 10 through a pipeline. The hoisting first control valve 1222 respectively connects with an oil inlet of the luffing balance valve 1221 and the rod cavity of the lifting oil cylinder 1211 through pipelines, the hoisting first control valve 1222 is configured to connect an oil supply equipment and can control oil supply status of the lifting oil cylinder 1211 to control the extension or contraction of the piston rod of the lifting oil cylinder 1211. The lowering control valve 1223 is connected to an interior of the luffing balance valve 1221 through a pipeline, when the lifting oil cylinder 1211 is in normal working condition, a valve core reversing of the luffing balance valve 1221 is controlled through the lowering control valve 1223, so that the valve core position of the luffing balance valve 1221 matches the control operation of the hoisting first control valve 1222.
[0046] Specifically, when the hoisting first control valve 1222 controls the oil supply to the rodless cavity of the lifting oil cylinder 1211, the valve core of the luffing balance valve 1221 is switched to the oil inlet and communicates with the rodless cavity of the luffing cylinder 1211 under the control of the lowering control valve 1223, so that the oil can enter the rodless cavity 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 and communicates with the rodless cavity of the lifting oil cylinder 1211 under the control of the lowering control valve 1223, at this time, the piston rod of the lifting oil cylinder 1211 can contract under the gravity of the boom, or, the hoisting first control valve 1222 controls the supply of oil to the rod cavity of the lifting oil cylinder 1211, the piston rod of the lifting oil cylinder 1211 contracts under the action of gravity of the boom and the action of oil pressure in the rod cavity.
[0047] The following is a specific embodiment of the crane hydraulic control system 1 according to the present application.
[0048] As shown in FIG. 1 and FIG. 2, the crane hydraulic control system 1 includes a slewing control subsystem 11, a hoisting control subsystem 12, a main control assembly 13 and a main control oil circuit 14, and the crane hydraulic control system 1 can be applied to a crane 2 having a hoisting mechanism 20, a slewing mechanism 22 and a boom 23 as shown in FIG. 3.
[0049] As shown in FIG. 1 and FIG. 2, the main control assembly 13 of the crane hydraulic control system 1 includes a main control valve 131, a detector 132 and an energy accumulator 133. One end of the main control valve 131 is connected to an input end of the main control oil circuit 14 through a pipeline, and another end of the main control valve 131 is connected to an oil tank; when the main control valve 131 is conducted, as shown in FIG. 2, the main control oil directly flows 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, as shown in FIG. 1, 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, and respectively acts on the slewing control subsystem 11 and the hoisting control subsystem 12, thus making the slewing control subsystem 11 and the hoisting control subsystem 12 enter the free floating state, so that the slewing mechanism 22 and the hoisting mechanism 20 of the crane 2 drive the boom 23 into a free floating state accordingly. The main control valve 131 is a manual valve, specifically can be a manual ball valve.
[0050] As shown in FIG. 1 and FIG. 2, the detector 132 is located in the main control oil circuit 14 to detect an oil pressure in the main control oil circuit 14, so that the operator can know whether the control oil pressure enters the main control oil circuit 14, and can also accurately know whether the oil pressure in the main control oil circuit 14 meets the requirements, so that corresponding countermeasures can be taken in time when the oil pressure is abnormal. Specifically, the detector 132 can be an oil pressure sensor. The detector 132 can be directly connected to the pipeline of the main control oil circuit 14, or can be connected to the main control oil circuit 14 through the pipeline.
[0051] The energy accumulator 133 connects to the main control oil circuit 14 through a pipeline and can perform an oil replenishment operation or an overflow operation on the main control oil circuit 14 to balance the oil pressure in the main control oil circuit 14. Specifically, when the oil pressure in the main control oil circuit 14 is too high, a part of the main control oil in the main control oil circuit 14 can flow into the energy accumulator 133 for storage, thereby realizing an overflow operation to reduce the oil pressure in the main control oil circuit 14; when the main control oil circuit 14 is too low, the control oil pressure stored in the energy accumulator 133 can flow into the main control oil circuit 14 to implement oil replenishment operation to increase the oil pressure in the main control oil circuit 14.
[0052] As shown in FIG. 1 and FIG. 2, the slewing control subsystem 11 includes a slewing drive mechanism 111, a slewing brake 112, a shuttle valve 113, a slewing first control valve 114 and a slewing second control valve 115. The slewing driving mechanism 111 specifically includes a closed rotary oil pump 1111 and a swing motor 1112. Two working oil ports of the swing motor 1112 respectively connect with two oil ports of the closed rotary oil pump 1111 through pipelines to form a closed circuit. Two pipelines connecting the two working oil ports of the swing motor 1112, one of which forms an oil inlet pipeline and the other forms an oil return pipeline. Depending on the flow direction of oil, the function of the oil inlet pipeline and the function of the oil return pipeline can be interchanged. An output end of the swing motor 1112 is transmission connected with the slewing mechanism 22, so that under normal working conditions, the swing motor 1112 outputs torque driven by the closed rotary oil pump 1111 to drive the slewing mechanism 22 to perform slewing operations. The slewing brake 112 is provided in correspondence with the swing motor 1112 to perform a braking operation on the swing motor 1112, and when the slewing brake 112 brakes the swing motor 1112, the slewing mechanism 22 is locked and the slewing operation cannot be performed.
[0053] An input oil port of the shuttle valve 113 connects with the main control oil circuit 14 through a pipeline, another input oil port of the shuttle valve 113 connects with the slewing first control valve 114 through a pipeline, and an output oil port of the shuttle valve 113 connects with the slewing brake 112, so that the shuttle valve 113 is configured to switch the main control oil circuit 14 or the slewing first control valve 114 to perform control operation of slewing brake 112. When the main control oil circuit 14 inputs the main control oil to the slewing brake 112 through the shuttle valve 113, the slewing brake 112 stops the braking operation, and at this time the slewing mechanism is in an unlocked state; when the main control oil circuit 14 does not input main control oil to the slewing brake 112 through the shuttle valve 113, the swing motor 1112 is in normal working condition, the slewing brake 112 works under the control of the slewing first control valve 114.
[0054] As shown in FIG. 1 and FIG. 2, the slewing second control valve 115 is a hydraulic control one-way valve group specifically. Two internal oil circuits provided in parallel are formed in the valve body of the slewing second control valve 115, and the two internal oil circuits are both equipped with one-way valves. One end of the two internal oil circuits both connect with the oil tank 10, and the control end of two one-way valves both connect with the main control oil circuit 14; and as for another end of the two internal oil circuits, one internal oil circuit connects with the oil inlet pipeline of the swing motor 1112 and the other internal oil circuit connects with the oil return pipeline of the swing motor 1112. When the slewing second control valve 115 is conducted under the action of the main control oil, the oil inlet pipeline of the swing motor 1112 and the oil return pipeline of the swing motor 1112 are connected through the slewing second control valve 115, at this time, the swing motor 1112 is in a sliding and rotating state. When the slewing brake 112 is in a non-braking state, the slewing mechanism can freely slide and rotate driven by the swing motor 1112, that is, the slewing mechanism enters a free floating state.
[0055] As shown in FIG. 1 and FIG. 2, the hoisting mechanism 20 includes a hoisting driving mechanism 121, the hoisting control subsystem 12 includes a hoisting control assembly 122 and a hoisting second control valve 123. The hoisting driving mechanism 121 specifically includes a lifting oil cylinder 1211; the hoisting control assembly 122 specifically includes a luffing balance valve 1221, a hoisting first control valve 1222 and a lowering control valve 1223.
[0056] The piston rod of the lifting oil cylinder 1211 is transmission connected to the boom 23 of the crane 2; the rod cavity of the lifting oil cylinder 1211 connects with the oil tank 10 by a pipeline. The luffing balance valve 1221 is located in the pipeline connecting the rodless cavity of the lifting oil cylinder 1211, and an oil return port of the luffing balance valve 1221 is connected to an oil tank 10 through a pipeline. The hoisting first control valve 1222 respectively connects with an oil inlet of the luffing balance valve 1221 and the rod cavity of the lifting oil cylinder 1211 through pipelines, the hoisting first control valve 1222 is configured to connect an oil supply equipment and can control oil supply status of the lifting oil cylinder 1211, that is, the hoisting first control valve 1222 can control the supply of oil to the rod cavity of the lifting oil cylinder 1211 or to the rodless cavity of the lifting oil cylinder 1211, so as to control the extension or contraction of the piston rod of the lifting oil cylinder 1211. The lowering control valve 1223 is connected to an interior of the luffing balance valve 1221 through a pipeline, when the lifting oil cylinder 1211 is in normal working condition, a valve core reversing of the luffing balance valve 1221 is controlled through the lowering control valve 1223, so that the valve core position of the luffing balance valve 1221 matches the control operation of the hoisting first control valve 1222.
[0057] The pipeline connecting with the rod cavity of the lifting oil cylinder 1211 and the pipeline connecting with the rodless cavity of the lifting oil cylinder 1211, one of which forms an oil inlet pipeline and the other forms an oil return pipeline. According to the different directions of extension movement and contraction movement of the piston rod, the function of the oil inlet pipeline and the function of the oil return pipeline can be interchanged.
[0058] As shown in the examples in FIG. 1 and FIG. 2, the hoisting second control valve 123 can be a hydraulic control one-way valve specifically; both ends of the hoisting second control valve 123 respectively connect with an oil inlet pipeline of the hoisting driving mechanism 121 and an oil return pipeline of the hoisting driving mechanism 121 through pipelines, a control end of the hoisting second control valve 123 connects with the main control oil circuit 14 through a pipeline; the hoisting second control valve 123 can be conducted under action of main control oil in the main control oil circuit 14 to connect the rod cavity of the lifting oil cylinder 1211 and the rodless cavity of the lifting oil cylinder 1211, so that the hoisting driving mechanism 121 and the boom enter a free floating state.
[0059] When the main control oil circuit 14 does not input the main control oil to the hoisting second control valve 123, the hoisting second control valve 123 is in a closed state, and at this time, the lifting oil cylinder 1211 is in a normal working state. When the hoisting first control valve 1222 controls the oil supply to the rodless cavity of the lifting oil cylinder 1211, the valve core of the luffing balance valve 1221 is switched to the oil inlet and communicates with the rodless cavity of the luffing cylinder 1211 under the control of the lowering control valve 1223, so that the oil can enter the rodless cavity to drive the piston rod to extend and drive the boom to hoist. When the boom needs to be lowered, the valve core of the luffing balance valve 1221 is switched to the oil return port and communicates with the rodless cavity of the lifting oil cylinder 1211 under the control of the lowering control valve 1223, the piston rod of the lifting oil cylinder 1211 can contract under the gravity of the boom, or, the hoisting first control valve 1222 controls the supply of oil to the rod cavity of the lifting oil cylinder 1211, the piston rod of the lifting oil cylinder 1211 contracts under the action of gravity of the boom and the action of oil pressure in the rod cavity.
[0060] It is to be noted that in another specific realization of this embodiment, as shown in FIG. 4, the main control valve 131 and the hoisting second control valve 123 can also be a hydraulic control valve, the slewing second control valve can also be a hydraulic control valve group. It is also possible to control the oil supply status in the main control oil circuit 14 with one-button through the main control valve 131, and then, under the action of the main control oil, the hoisting second control valve 123 providing with a hydraulic control valve and the slewing second control valve 115 providing with a hydraulic control valve group are conducted, so that the slewing mechanism 22 and the hoisting mechanism drive the boom 23 to enter a free floating state.
[0061] When the crane 2 applies the crane hydraulic control system 1 in this embodiment and the crane 2 assists in carrying the boom 23 through the external trailer 24 during driving, the slewing mechanism 22 and the hoisting mechanism 20 of the crane 2 can drive the boom 23 into a free floating state through a one-time control operation of the main control valve 131, so as to move synchronously with the trailer 24 during the driving process, especially during the road rises and falls or turns, it can match the driving trajectory of the vehicle body 21 of the crane 2 and the trailer 24.
[0062] The crane hydraulic control system 1 in this embodiment uses the main control assembly 13 to perform unified control operations on the slewing control subsystem 11 and the hoisting control subsystem 12 by improving and optimizing the control method, so that the slewing mechanism and the hoisting mechanism 20 of the crane can drive the boom to enter into a free floating state, and can realize the effect of one-button operation, which greatly simplifies the process and steps of the control operation and improves the efficiency of the control operation, moreover, it can effectively prevent the operator from omitting individual operation steps when performing adjustment operations, thereby avoiding the phenomenon that the crane 2 starts driving before the slewing mechanism 22 and the hoisting mechanism 20 are completely in a free state, which will help reduce the possibility of damage to the boom 23 and related mechanisms during driving, and will also help reduce potential safety hazards.
[0063] In an embodiment of the second aspect according to the present application, a crane 2 is also provided. As shown in FIG. 1, FIG. 3 and FIG. 5, the crane 2 includes a vehicle body 21, a slewing mechanism 22, a boom 23, a hoisting mechanism 20 and the crane hydraulic control system 1 in any embodiment of the above first aspect. The slewing mechanism 22, the hoisting mechanism 20 and the boom 23 are all provided on the vehicle body 21 to achieve movement with the vehicle. The slewing mechanism 22 is rotatably connected to the vehicle body 21, and the slewing mechanism 22 is configured to perform a horizontal slewing operation relative to the vehicle body 21; the boom 23 is provided on the slewing mechanism 22 and is rotatably connected to the slewing mechanism 22; the boom 23 is configured to perform a slewing operation relative to the vehicle body 21 together with the slewing mechanism 22. The hoisting mechanism 20 is transmission connected with the boom 23 and is configured to drive the boom 23 to perform hoisting operation or lowering operation in the vertical direction relative to the slewing mechanism 22. The slewing control subsystem 11 of the crane hydraulic control system
1 is transmission connected to the slewing mechanism 22 to drive the slewing mechanism 22 to perform horizontal slewing motion; and the hoisting control subsystem 12 of the crane hydraulic control system 1 is transmission connected with the hoisting mechanism 20 to drive the boom 23 to perform hoisting operation or lowering operation.
[0064] When the crane 2 assists in carrying the boom 23 through the external trailer 24 during driving, the slewing mechanism 22 and the hoisting mechanism 20 of the crane 2 can drive the boom 23 into a free floating state through a one-time control operation of the main control valve 131 of the crane hydraulic control system 1, so as to move synchronously with the trailer 24 during the driving process, especially during the road rises and falls or turns, it can match the driving trajectory of the vehicle body 21 of the crane 2 and the trailer 24.
[0065] Furthermore, the boom 23 in this embodiment may be a telescopic boom; the slewing mechanism 22 may specifically be a turntable.
[0066] Furthermore, in this embodiment, the crane 2 may also include a trailer 24, as shown in FIG. 3, the trailer 24 is flexibly connected to the rear part of the vehicle body 21 of the crane 2 and can drive with the vehicle under the traction of the vehicle body 21; the rear part of the boom 23 extends from the rear part of the vehicle body 21 and is carried on the trailer 24 to reduce the axle load of the crane 2. The vehicle body 21 and the trailer 24 can rotate relative to each other in the horizontal direction and vertical direction to adapt to the undulating road surface and the turning operation of the vehicle body 21. During the driving process, the boom 23, the slewing mechanism 22 and the hoisting mechanism 20 are all in a free floating state to move synchronously with the trailer 24.
[0067] In addition, the crane 2 in this embodiment also has all the beneficial effects of the crane hydraulic control system 1 in any embodiment of the first aspect, which will not be described again.
[0068] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, advantages, effects and so on mentioned in the present application are only examples and not limitations, and these advantages, advantages, effects and so on cannot be considered to be necessary for each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and to facilitate understanding, and are not limiting, and the above details do not limit the present application to the fact that the present application must be implemented using the above specific details.
[0069] The block diagrams of the components, devices, equipment and systems involved in the present application are only 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 components, devices, equipment and systems may be connected, arranged, and configured in any manner. Words such as "include", "comprise", "have" or the like are open-ended terms that mean "including, but not limited to", and may be used interchangeably therewith. The words "or" and "and" as used herein refer to the words "and/or" and may be used interchangeably therewith unless the context clearly indicates otherwise. The word "such as" as used herein refers to the phrase "such as, but not limited to" and may be used interchangeably therewith. It should also be noted that in the device and equipment of the present application, each component can be disassembled and/or reassembled. These decompositions and/or recombinations should be regarded as equivalent solutions of the present application.
[0070] The foregoing description has been presented for the purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the form disclosed herein. Although various example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.
[0071] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the present application herein.
[0072] The above are only some embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions or the like made within the spirit and principles of the present application shall be included in the scope of the present application.

Claims (10)

CLAIMS What is claimed is:
1. A crane hydraulic control system for a crane provided with a hoisting mechanism (20), a slewing mechanism (22) and a boom (23), characterized in that the crane hydraulic control system comprises: a slewing control subsystem (11) configured to be transmission connected with the slewing mechanism (22) to drive the boom (23) to rotate; a hoisting control subsystem (12) configured to be transmission connected with the hoisting mechanism (20) to drive the boom (23) to hoist or lower; and a main control assembly (13) connecting with the slewing control subsystem (11) and the hoisting control subsystem (12) through a main control oil circuit (14), wherein the main control assembly (13) is configured to control oil supply status of the main control oil circuit (14) to control the slewing control subsystem (11) and the hoisting control subsystem (12) to switch between a normal working state and a free floating state.
2. The crane hydraulic control system according to claim 1, wherein the main control assembly (13) comprises a main control valve (131), one end of the main control valve (131) is connected to an input end of the main control oil circuit (14) through a pipeline, another end of the main control valve (131) is connected to an oil tank, and the main control valve (131) is configured to control main control oil to flow into the main control oil circuit (14) or flow into the oil tank.
3. The crane hydraulic control system according to claim 2, wherein the main control assembly (13) further comprises: a detector (132) located in the main control oil circuit (14) and configured to detect an oil pressure in the main control oil circuit (14); and an energy accumulator (133) connected to the main control oil circuit (14) through a pipeline and configured to perform an oil replenishment operation or an overflow operation on the main control oil circuit (14); wherein the main control valve (131) is a manual control valve or a hydraulic control valve.
4. The crane hydraulic control system according to any one of claims 1 to 3, wherein the slewing control subsystem (11) comprises: a slewing driving mechanism (111) configured to be transmission connected with the slewing mechanism (22); a slewing brake (112) provided corresponding to the slewing driving mechanism (111) and configured to perform a braking operation on the slewing driving mechanism (111); a shuttle valve (113), wherein an input oil port of the shuttle valve (113) connects with the main control oil circuit (14) through a pipeline, and an output oil port of the shuttle valve (113) connects with the slewing brake (112); a slewing first control valve (114) connecting with another input oil port of the shuttle valve (113) through a pipeline, wherein the slewing brake (112) is configured to adjust a working state under action of oil in the slewing first control valve (114) or action of main control oil in the main control oil circuit (14); and a slewing second control valve (115), wherein one end of the slewing second control valve (115) connects with an oil tank, another end of the slewing second control valve (115) connects with an oil inlet pipeline of the slewing driving mechanism (111) and an oil return pipeline of the slewing driving mechanism (111), a control end of the slewing second control valve (115) connects with the main control oil circuit (14) and is configured to be conducted under action of the main control oil to connect the oil inlet pipeline of the slewing driving mechanism (111) and the oil return pipeline of the slewing driving mechanism (111).
5. The crane hydraulic control system according to claim 4, wherein the slewing driving mechanism (111) comprises a closed rotary oil pump (1111) and a swing motor (1112), two working oil ports of the swing motor (1112) respectively connect to two oil ports of the closed rotary oil pump (1111) through pipelines; one of two pipelines connecting the two working oil ports of the swing motor (1112) forms an oil inlet pipeline and the other one of the two pipelines connecting the two working oil ports of the swing motor (1112) forms an oil return pipeline; and an output end of the swing motor (1112) is transmission connected with the slewing mechanism (22).
6. The crane hydraulic control system according to claim 5, wherein: two internal oil circuits provided in parallel are formed in the slewing second control valve (115), one end of the two internal oil circuits both connect to the oil tank, another end of the two internal oil circuits respectively connect to the oil inlet pipeline of the swing motor (1112) and the oil return pipeline of the swing motor (1112); and the slewing second control valve (115) is a hydraulic control one-way valve group or a hydraulic control valve group.
7. The crane hydraulic control system according to any one of claims I to 3, wherein: the hoisting mechanism (20) comprises a hoisting driving mechanism (121) configured to be transmission connected to the boom (23); the hoisting control subsystem (12) comprises a hoisting control assembly (122) and a hoisting second control valve (123); the hoisting control assembly (122) is connected with the hoisting driving mechanism (121) through a pipeline, and the hoisting control assembly (122) is configured to control the hoisting driving mechanism (121) to work; and both ends of the hoisting second control valve (123) respectively connect to an oil inlet pipeline of the hoisting driving mechanism (121) and an oil return pipeline of the hoisting driving mechanism (121) through pipelines, a control end of the hoisting second control valve (123) connects with the main control oil circuit (14) through a pipeline, and the hoisting second control valve (123) is configured to be conducted under action of main control oil in the main control oil circuit (14) to connect the oil inlet pipeline of the hoisting driving mechanism (121) and the oil return pipeline of the hoisting driving mechanism (121).
8. The crane hydraulic control system according to claim 7, wherein: the hoisting driving mechanism (121) comprises a lifting oil cylinder (1211) being transmission connected to the boom (23); a rod cavity of the lifting oil cylinder (1211) and a rodless cavity of the lifting oil cylinder (1211) respectively connect to the hoisting control assembly (122) through pipelines; the pipeline connecting the rod cavity of the lifting oil cylinder (1211) and the pipeline connecting the rodless cavity of the lifting oil cylinder (1211), one of which forms an oil inlet pipeline and the other forms an oil return pipeline; one end of the hoisting second control valve (123) is connected to the pipeline connecting the rod cavity of the lifting oil cylinder (1211) through a pipeline, and another end of the hoisting second control valve (123) is connected to the pipeline connecting the rodless cavity of the lifting oil cylinder (1211) through a pipeline, the control end of the hoisting second control valve (123) connects with the main control oil circuit (14) through a pipeline; and the hoisting second control valve (123) is a hydraulic control one-way valve or a hydraulic control valve.
9. The crane hydraulic control system according to claim 8, wherein the hoisting control assembly (122) comprises: a luffing balance valve (1221) located in the pipeline connecting the rodless cavity of the lifting oil cylinder (1211), wherein an oil return port of the luffing balance valve (1221) connects with an oil tank through a pipeline; a hoisting first control valve (1222) respectively connecting with an oil inlet of the luffing balance valve (1221) and the rod cavity of the lifting oil cylinder (1211) through pipelines, wherein the hoisting first control valve (1222) is configured to connect an oil supply equipment and is configured to control oil supply status of the lifting oil cylinder (1211); and a lowering control valve (1223) connected to an interior of the luffing balance valve (1221) through a pipeline, wherein the lowering control valve (1223) is configured to control a valve core reversing of the luffing balance valve (1221).
10. A crane, characterized by comprising: a vehicle body (21); a slewing mechanism (22) rotatably provided on the vehicle body (21); a boom (23) rotatably connecting with the slewing mechanism (22), wherein part of the boom (23) is configured to extend outward from the vehicle body (21) and is configured to be carried on an auxiliary carrying device; a hoisting mechanism (20) provided on the vehicle body (21), wherein the hoisting mechanism (20) is transmission connected with the boom (23) and is configured to drive the boom (23) to hoist or lower; and the crane hydraulic control system according to any one of claims 1 to 9, the crane hydraulic control system is provided on the vehicle body (21); wherein the slewing control subsystem (11) is transmission connected with the slewing mechanism (22), and the hoisting control subsystem (12) is transmission connected with the hoisting mechanism (20).
AU2023285987A 2022-10-27 2023-05-30 Crane hydraulic control system and crane Pending AU2023285987A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN202211329157.XA CN115744632A (en) 2022-10-27 2022-10-27 Crane hydraulic control system and crane
CN202211329157.X 2022-10-27
PCT/CN2023/097224 WO2024087626A1 (en) 2022-10-27 2023-05-30 Crane hydraulic control system and crane

Publications (1)

Publication Number Publication Date
AU2023285987A1 true AU2023285987A1 (en) 2024-05-16

Family

ID=85354133

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2023285987A Pending AU2023285987A1 (en) 2022-10-27 2023-05-30 Crane hydraulic control system and crane

Country Status (3)

Country Link
CN (1) CN115744632A (en)
AU (1) AU2023285987A1 (en)
WO (1) WO2024087626A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115744632A (en) * 2022-10-27 2023-03-07 湖南三一中型起重机械有限公司 Crane hydraulic control system and crane

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4367673A (en) * 1981-01-09 1983-01-11 Dresser Industries, Inc. System and method for controlling the elevation of a boom hoist device
JP4302360B2 (en) * 2002-06-05 2009-07-22 株式会社タダノ Crane alarm device
JP2006028739A (en) * 2004-07-12 2006-02-02 Kuramoto Tekko Kk Dust collector
CN203602275U (en) * 2013-11-28 2014-05-21 徐州重型机械有限公司 Autonomous control system for crane
CN103613011B (en) * 2013-11-28 2015-07-22 徐州重型机械有限公司 Autonomous control system for crane
CN110566522A (en) * 2019-09-06 2019-12-13 湖南星邦重工有限公司 Active floating control system for underframe and aerial work platform thereof
CN114212714B (en) * 2021-11-09 2024-04-05 中船华南船舶机械有限公司 Hydraulic system of crane
CN115744632A (en) * 2022-10-27 2023-03-07 湖南三一中型起重机械有限公司 Crane hydraulic control system and crane

Also Published As

Publication number Publication date
CN115744632A (en) 2023-03-07
WO2024087626A1 (en) 2024-05-02

Similar Documents

Publication Publication Date Title
EP3351807B1 (en) Hydraulic driving apparatus for a work machine
WO2015117338A1 (en) Single-hydraulic motor double-loop control system
CN108045432B (en) Steering cylinder, hydraulic power steering system, steering axle and vehicle
CN103950870B (en) A kind of forklift hydraulic system of double pump fuel feeding band energy regenerating
AU2023285987A1 (en) Crane hydraulic control system and crane
CN106678098B (en) Crane hydraulic control system and crane
WO2013159590A1 (en) Energy regeneration type forklift hydraulic system
CN102887447B (en) Hydraulic control loop of variable amplitude hydraulic cylinder, crane and variable amplitude control method
CN103899588B (en) Lorry-mounted crane multi-way reversing device and straight-arm lorry-mounted crane
CN107061430A (en) The hoisting system of minus flow hydraulic circuit control
CN102616705A (en) Energy-saving forklift hydraulic system with energy recovery function
CN103015725B (en) Boom hydraulic system, control method thereof, boom system and concrete pumping equipment
CN109250626B (en) Small crank arm insulating aerial working vehicle arm support and control system thereof
CN111649022A (en) Single-cylinder bolt control valve group, horizontal bar bolt control system and crane
CN102515025B (en) Superstructure rotary hydraulic control system and crane with same
CN202322047U (en) Super-lift winding control system and cane applying same
CN102431899A (en) Super-lift winch control system and crane using the same
CN202937011U (en) Boom hydraulic system, boom system and concrete pumping equipment
CN109515417A (en) Brake fluid system and crane
CN203717509U (en) Lorry-mounted crane multi-way reversing device and straight-arm lorry-mounted crane
CN112081170A (en) Loader hydraulic system and loader
CN203890013U (en) Double-pump oil supply and energy recovery type forklift hydraulic system
CN202937013U (en) Boom hydraulic system, boom system and concrete pumping equipment
CN113404730B (en) Steering system of electric loader based on hydraulic accumulator and variable motor
CN211844392U (en) Hydraulic braking system and rotary drilling rig