CN112723166A - Hydraulic control module, hydraulic control system and engineering machinery - Google Patents
Hydraulic control module, hydraulic control system and engineering machinery Download PDFInfo
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- CN112723166A CN112723166A CN202011578665.2A CN202011578665A CN112723166A CN 112723166 A CN112723166 A CN 112723166A CN 202011578665 A CN202011578665 A CN 202011578665A CN 112723166 A CN112723166 A CN 112723166A
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- 230000009471 action Effects 0.000 claims abstract description 70
- 238000012545 processing Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 237
- 230000000875 corresponding effect Effects 0.000 description 90
- 230000007246 mechanism Effects 0.000 description 27
- 230000008859 change Effects 0.000 description 12
- 230000008602 contraction Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000003749 cleanliness Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000010720 hydraulic oil Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010729 system oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
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Classifications
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- 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
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- 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
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- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a hydraulic control valve group and discloses a hydraulic control module, a hydraulic control system and engineering machinery, wherein the hydraulic control module comprises an oil unloading port (T), a plurality of pilot control oil ports and a control valve group connected with an operating device (1), the control valve group comprises an integrated unloading control valve group and an action switching control valve group, the operating device (1) is connected with the oil unloading port (T) through the unloading control valve group, the operating device (1) is connected with each pilot control oil port through the action switching control valve group, and the action switching control valve group is connected with the oil unloading port (T) through the unloading control valve group so as to unload pilot oil. The hydraulic control module has relatively fewer pipelines, is convenient to assemble, has relatively simple valve body processing, and has better economy and lower failure rate.
Description
Technical Field
The invention relates to a hydraulic control valve group, in particular to a hydraulic control module; in addition, still relate to a hydraulic control system and engineering machine tool.
Background
As a special hoisting device, a crane is usually required to perform the following actions: lifting hook, lifting arm support (hereinafter referred to as amplitude variation), rotation, walking and the like. Because the height of the crane boom is limited, the boom can be damaged when the lifting hook is too high, and the remaining number of turns of the steel wire rope on the winch is too small when the lifting hook is too low, so that the accident that the steel wire rope is separated from the winch is caused; meanwhile, the angle of the arm support cannot be too large, otherwise, the risk of backward tilting of the arm support can be caused, and the angle of the arm support cannot be too small, so that the accident that the vehicle is turned over due to the fact that the stability of the whole vehicle is not enough is avoided. In order to meet the above requirements, the crane is usually equipped with a special torque limiter control system (hereinafter referred to as a force limiter) to monitor the working state of the crane, and when the above limit state is reached, the corresponding operation is shielded, so as to achieve the purpose of safe operation.
For a hydraulic control system, an operator needs to operate a pilot handle, and a pilot control pressure signal which changes in proportion is output by the pilot handle to drive a multi-way valve of a corresponding working link to change directions, so that corresponding actions are controlled. The control valve group is arranged to realize the control functions of crane operation, including the control of dangerous action direction, force limiter unloading, action switching control, one-way valve network and the like.
For example, patent application CN105422530A discloses a pilot integrated multi-way valve, which integrates an electromagnetic directional valve with a corresponding multi-way valve, and the electromagnetic directional valve is connected with a control cavity of the corresponding multi-way valve to form an integrated hydraulic control system; when the electromagnetic directional valve is power-off, the pilot control pressure signal output by the pilot handle is cut off by the electromagnetic directional valve, so that dangerous actions are avoided and the unloading function of the force limiter is realized; in the integrated hydraulic control system, the number of the electromagnetic valves is large, the shuttle valve network design is adopted, the valve body is complex to process, and the cost is high. Therefore, another split hydraulic control system widely used in the market divides the hydraulic control system into a plurality of valve blocks, for example, patent application CN102182715A discloses a hydraulic control system that integrates an electromagnetic valve and a check valve for limiting dangerous actions and realizing the unloading function of a force limiter into one valve block, and integrates an electromagnetic valve for action switching (amplitude and telescopic switching) control into another valve block; the remote control cavity of the multi-valve path is connected with an unloading electromagnetic valve through a one-way valve network, a pilot valve is connected with the other control cavity of the multi-valve path, the multi-way valve is driven to reverse by outputting pilot control pressure, the actions of boom stretching, amplitude changing, hoisting and the like are carried out, when dangerous actions occur or the unloading function is required to be carried out by utilizing a force limiter, the unloading electromagnetic valve is controlled to unload hydraulic oil for driving the boom stretching, amplitude changing and hoisting, wherein the one-way valve network is used for isolating each actuating mechanism, so that the purpose of reducing the number of used hydraulic electromagnetic valves is achieved; the split type hydraulic control system needs more connecting pipelines and affects the assembly efficiency. Moreover, the corresponding unloading mode is high-pressure unloading, the use requirement on the electromagnetic valve is high, the cleanliness of hydraulic oil is inconvenient to guarantee, and the failure rate is high.
In view of the above, a new hydraulic control module is needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a hydraulic control module which has relatively few pipelines, is convenient to assemble, has relatively simple valve body processing, has better economy and lower failure rate.
A further object of the present invention is to provide a hydraulic control system, which has relatively few pipelines, good economy and low failure rate.
In addition, the invention aims to provide a construction machine which has a low failure rate.
In order to solve the technical problems, the invention provides a hydraulic control module, which comprises an oil discharge port, a plurality of pilot control oil ports and a control valve group connected with an operating device, wherein the control valve group comprises an integrated unloading control valve group and an action switching control valve group, the operating device is connected with the oil discharge port through the unloading control valve group, the operating device is connected with each pilot control oil port through the action switching control valve group, and the action switching control valve group is connected with the oil discharge port through the unloading control valve group so as to unload pilot oil.
Preferably, the unloading control valve group comprises a first unloading control valve and a second unloading control valve which are connected in parallel, the action switching control valve group comprises a first switching control valve and a second switching control valve which are connected in parallel, the first switching control valve and the second switching control valve are respectively connected with the operating device, a first working oil port and a second working oil port of the first switching control valve are respectively connected with the oil unloading port through the first unloading control valve so as to unload the pilot oil, the operating device is connected with the oil unloading port through the second unloading control valve, and a control oil port for outputting the pilot oil is arranged on the pilot oil path between the second unloading control valve and the operating device.
Further preferably, the unloading control valve group further comprises a third unloading control valve connected in parallel with the first unloading control valve and the second unloading control valve, the operating device is connected with the oil unloading port through the third unloading control valve, and a control oil port for outputting pilot oil is arranged on a pilot oil path between the third unloading control valve and the operating device.
Preferably, the unloading control valve group includes a first unloading control valve and a second unloading control valve respectively connected to the operating device, the motion switching control valve group includes a first switching control valve and a second switching control valve connected in parallel, the first switching control valve and the second switching control valve are respectively connected to the operating device, a first working oil port and a second working oil port of the first switching control valve are respectively connected to the oil unloading port through the first unloading control valve, the first unloading control valve and the second unloading control valve are disposed between the operating device and the oil unloading port, and a pilot oil path between the first unloading control valve and the operating device and a pilot oil path between the second unloading control valve and the operating device are both provided with control oil ports for outputting pilot oil.
Preferably, the unloading control valve group comprises a first unloading control valve connected with the operating device, the action switching control valve group comprises a first switching control valve and a second switching control valve which are connected in parallel, the first switching control valve and the second switching control valve are respectively connected with the operating device, a first working oil port and a second working oil port of the first switching control valve are respectively connected with the oil unloading port through the first unloading control valve, the operating device is connected with the oil unloading port through the first unloading control valve, a plurality of pilot oil paths are arranged between the first unloading control valve and the operating device so as to unload the pilot oil, and each pilot oil path is provided with a control oil port for outputting the pilot oil.
Preferably, the unloading control valve group comprises a first unloading control valve, the action switching control valve group comprises a first switching control valve, a second switching control valve, a third switching control valve and a fourth switching control valve which are connected in parallel, the first switching control valve, the second switching control valve, the third switching control valve and the fourth switching control valve are respectively connected with the operating device, and a first working oil port and a second working oil port of the first switching control valve, a first working oil port and a second working oil port of the third switching control valve and a first working oil port and a second working oil port of the fourth switching control valve are respectively connected with the oil unloading port through the first unloading control valve so as to unload the pilot oil.
More preferably, the oil inlet of the first switching control valve, the oil inlet of the third switching control valve, and the oil inlet of the fourth switching control valve are respectively connected to the operating device, and the oil return port of the first switching control valve, the oil return port of the third switching control valve, and the oil return port of the fourth switching control valve are respectively connected to the oil discharge port.
Optionally, an oil inlet of the first switching control valve is connected with the operating device, and an oil return port of the first switching control valve is connected with the oil discharge port.
Typically, the operating means is a hydraulic handle.
Typically, a filter is provided between the operating means and the control oil source.
The invention also discloses a hydraulic control system, which comprises an operating valve and the hydraulic control module in any one of the technical schemes, wherein the operating valve comprises a plurality of working units which are correspondingly connected with the hydraulic actuating elements one by one, and the hydraulic control module is respectively connected with the control cavity of the main valve of each working unit.
In addition, the invention discloses engineering machinery comprising the hydraulic control system in the technical scheme.
Through the technical scheme, the invention has the following beneficial effects:
the unloading control valve bank and the action switching control valve bank are integrated, the number and the length of connecting pipelines can be reduced, the assembly is convenient, the reaction speed is high to a certain extent, the probability of oil leakage points is reduced, and oil leakage faults are effectively prevented; and compared with an integrated hydraulic control system, the integrated hydraulic control system has the advantages of low integration level, relatively simple valve body processing and relatively low cost. In addition, in the hydraulic control module, the action switching control valve group is connected with the oil discharging port through the unloading control valve group, and in the connection mode, when dangerous action occurs, the unloading control valve group can enable the pilot oil output by the action switching control valve group to be discharged through the oil discharging port, namely the pilot oil in a control cavity of a multi-way valve in a hydraulic control system is unloaded, so that the action of a corresponding hydraulic execution mechanism is stopped, the dangerous action is cut off, and the operation safety is ensured. The unloading mode is low-pressure unloading, and the use requirement on the hydraulic valve is low, so that the cleanliness of oil is ensured, and the probability of failure of the hydraulic valve is reduced.
And, set up the filter between operating means and the control oil source, because the pilot oil is low pressure oil, the filter need not be high pressure filter, and the cost is lower, moreover, to low pressure oil, can ensure the filter fineness.
Furthermore, the invention cancels a complex shuttle valve network or one-way valve network design, can prevent the action linkage phenomenon caused by the untight sealing of the one-way valve, and effectively simplifies the structural design.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The following drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the scope of the invention. In the drawings:
FIG. 1 is a hydraulic schematic of a hydraulic control module according to an embodiment of the present invention;
FIG. 2 is a hydraulic schematic of a pilot valve according to an embodiment of the present invention.
Description of the reference numerals
1 operating means L1 first oil port of left hydraulic handle
Second oil port of L2 left hydraulic handle, third oil port of L3 left hydraulic handle
L4 fourth oil port of left hydraulic handle R1 first oil port of right hydraulic handle
Second oil port of R2 right hydraulic handle R3 third oil port of right hydraulic handle
R4 right hydraulic handle fourth oil port T oil discharge port
21 first unloading control valve 22 second unloading control valve
23 third unloading control valve 31 first switching control valve
First working oil port of A1 first switching control valve
Second working oil port of A2 first switching control valve
P1 oil inlet T1 oil return port of first switching control valve
32 second switching control valve 4
First control port of 41 main valve a1 main valve
Second control port of a2 Main valve third control port of a3 Main valve
Fourth control port of a4 Main valve b1 fifth control port of Main valve
Sixth control port of b2 Main valve seventh control port of b3 Main valve
52-pair hoisting actuating mechanism and 53-boom telescopic actuating mechanism
54 amplitude-variable actuating mechanism
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Furthermore, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicit indication of the number of technical features indicated, and therefore, the features defined as "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth" may explicitly or implicitly include one or more of the features described.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
First, it should be noted that the hydraulic control module of the present invention belongs to the hydraulic field, and for those skilled in the art, the substantial technical idea thereof lies in the hydraulic connection relationship. The related hydraulic components, such as directional valves, hydraulic handles, filters, etc., are well known to those skilled in the art and are common components in existing hydraulic systems, and therefore, they will be described only briefly below. After understanding the technical concept of the present invention, those skilled in the art may also simply replace an oil path or a valve, etc. to implement the function of the hydraulic control module of the present invention, which also belongs to the protection scope of the present invention.
As shown in fig. 1, the hydraulic control module according to the basic technical scheme of the present invention includes an oil discharge port T, a plurality of pilot control oil ports, and a control valve group connected to an operation device 1, where the control valve group includes an integrated unloading control valve group and an action switching control valve group, the operation device 1 is connected to the oil discharge port T through the unloading control valve group, the operation device 1 is connected to each pilot control oil port through the action switching control valve group, and the action switching control valve group is connected to the oil discharge port T through the unloading control valve group, so as to unload the pilot oil.
The invention integrates an unloading control valve group for avoiding dangerous actions and realizing the unloading function of a force limiter and an action switching control valve group for controlling the action of an actuating mechanism into a whole; compared with a split type hydraulic control system, the hydraulic control system has the advantages that connecting pipelines are effectively reduced, the assembly is convenient, the possibility of oil leakage points is reduced, and the probability of oil leakage faults is reduced; in addition, the split hydraulic control system provided by the patent application CN102182715A adopts a parallel unloading mode which is a high-pressure unloading mode, the parallel unloading mode is an unloading valve opening mode, the controlled pressure is communicated with the leakage loop, and the unloading mode is communicated with the system oil path, the unloading mode has a high requirement on the processing precision control of elements (such as electromagnetic valves), during the actual use process, the problems of incomplete unloading and residual action are easy to occur, the operation safety is affected, the high-pressure unloading has a high requirement on the use of the electromagnetic valves, the cleanliness of hydraulic oil is inconvenient to ensure, and faults are easy to occur; however, in the present invention, the operation switching control valve set is connected to the oil discharge port T through the unloading control valve set, and in normal operation, pilot oil is output from the operation device to the pilot control oil port through the operation switching control valve set, and the pilot oil is input from the pilot control oil port to the control cavity of the control valve of the corresponding actuator, so as to control the operation of the corresponding actuator; under the condition of dangerous action, pilot oil flowing through the action switching control valve group can be unloaded through the unloading control valve group, so that corresponding action is cut off, the operation safety is guaranteed, and the cleanliness of hydraulic oil can be guaranteed and the failure rate is reduced by adopting low-pressure unloading; overall, the method has better economy and relatively simple control logic.
For better understanding of the technical concept of the present invention, the following description is made in conjunction with a specific hydraulic control system, and a crane is taken as an example
As shown in fig. 2, the operation valve of the present invention is composed of a plurality of groups of working links 4, specifically, taking four groups of working links 4 as an example to describe the actions of main hoisting, auxiliary hoisting, boom extension and retraction, and luffing of the crane, the working link 4 includes main valves 41, each main valve 41 is respectively connected with the main hoisting actuator 51, the auxiliary hoisting actuator 52, the boom extension and retraction actuator 53, and the luffing actuator 54, and the like in a one-to-one correspondence manner, and system oil can be delivered to the corresponding actuator through the main valves 4 to drive the corresponding actuator to perform the actions of main hoisting rise and fall, auxiliary hoisting rise, boom extension and retraction, and luffing rise and fall; for convenience of distinction, the main valve 41 connected to the main hoisting actuator 51 has a fourth control port a4 and an eighth control port b4, the main valve 41 connected to the sub hoisting actuator 52 has a third control port a3 and a seventh control port b3, the main valve 41 connected to the boom extension actuator 53 has a second control port a2 and a sixth control port b2, the main valve 41 connected to the luffing actuator 54 has a first control port a1 and a fifth control port b1, and actuators such as the main hoisting actuator 51, the sub hoisting actuator 52, the boom extension actuator 53, and the luffing actuator 54 are controlled to perform different operations by moving the valve body of the corresponding main valve 41 through each control port. Correspondingly, the hydraulic control module is connected to the control port of each main valve 41, and the hydraulic control module inputs pilot oil to the control port of each main valve 41 to control the direction change of each main valve 41. Referring to fig. 2, the main valve 41 is preferably a three-position six-way valve, but may also be other hydraulic valves capable of achieving the same function, for example, the main valve 41 is a three-position seven-way valve with one oil port blocked; the actuators may be hydraulic motors, hydraulic cylinders or other actuators, for example, the main hoist actuator 51 and the auxiliary hoist actuator 52 may be hydraulic motors, and the boom extension actuator 53 and the luffing actuator 54 may be hydraulic cylinders or the like.
The hydraulic control module can have various implementation forms; fig. 1 provides a concrete structure form of a hydraulic control module, wherein the unloading control valve group comprises a first unloading control valve 21, a second unloading control valve 22 and a third unloading control valve 23 which are connected in parallel, the first unloading control valve 21, the second unloading control valve 22 and the third unloading control valve 23 are respectively connected with an oil unloading port T, the action switching control valve group comprises a first switching control valve 31 and a second switching control valve 32 which are connected in parallel, the first switching control valve 31 is connected with the operating device 1, the first switching control valve 31 is connected with the oil unloading port T through the first unloading control valve 21, the second switching control valve 32 is also connected with the operating device 1, a first working oil port a1 and a second working oil a2 of the first switching control valve 31 are connected with a sixth control port b2 of a main valve 41 corresponding to the pilot boom telescopic actuating mechanism 53 and a fifth control port b1 of the main valve 41 corresponding to the main boom actuating mechanism 54 in a one-to one correspondence through two working oil ports of the hydraulic control module, the two working oil ports of the second switching control valve 32 are connected with the first control port a1 of the main valve 41 corresponding to the luffing actuator 54 and the second control port a2 of the main valve 41 corresponding to the boom extension actuator 53 in a one-to-one correspondence manner through the two pilot control oil ports of the hydraulic control module, and in the case of normal operation, the operating device 1 pushes the main valve 41 corresponding to the luffing actuator 54 and the main valve 41 corresponding to the boom extension actuator 53 to be reversed through the first switching control valve 31 or the second switching control valve 32, so as to realize luffing and boom extension actions, for example, the first switching control valve 31 is used for controlling luffing and boom extension actions; the first working port a1 and the second working oil a2 of the first switching control valve 31 are also connected to the first unloading control valve 21, when dangerous actions occur, for example, dangerous actions are generated in a limit state such as overlarge amplitude rise and fall (the arm support angle is too large, which may cause the danger of the arm support tilting backwards, or the arm support angle is too small, which may cause the accident of overturning due to insufficient stability of the whole crane), the force limiter can monitor the working state of the crane, when the crane reaches the limit state, the force limiter can feed back the working state information of the crane, thereby controlling the first unloading control valve 21 to change direction, cutting off the oil path between the first switching control valve 31 and the control port of the corresponding main valve 41, the pilot oil is unloaded, so that the main valve 41 is correspondingly switched to cut off corresponding actions, the unloading function of the force limiter is realized, and dangerous actions are prevented. The second unloading control valve 22 and the third unloading control valve 23 are also connected to the operating device 1, two oil passages are formed between the second unloading control valve 22 and the operating device 1, two control ports are provided on the two oil passages, respectively, corresponding to the third control port a3 of the main valve 41 connected to the auxiliary hoist actuator 52 and the fourth control port a4 of the main valve 41 corresponding to the main hoist actuator 51, one for one, and two oil passages are formed between the third unloading control valve 23 and the operating device 1, two control ports are provided on the two oil passages, respectively, corresponding to the seventh control port b3 of the main valve 41 connected to the auxiliary hoist actuator 52 and the eighth control port b4 of the main valve 41 corresponding to the main hoist actuator 51, and in a normal operation, the oil passages between the second unloading control valve 22 and the third unloading control valve 23 and the oil outlet T are in a disconnected state, and the pilot oil output from the operating device 1 flows into the corresponding main valve ports of the main valve 41 through the corresponding controls, so as to control the main hoisting or the auxiliary hoisting; when dangerous actions occur, for example, dangerous actions are generated by limit states such as overwinding (the boom is damaged when the lifting hook is lifted too high), over-releasing of a crane steel wire rope (the remaining number of turns of the steel wire rope on the winch is too small when the lifting hook is dropped too low, and further an accident that the steel wire rope is separated from the winch) and the like, the force limiter can monitor the working state of the crane, and when the crane reaches the limit states, the force limiter can feed back the working state information of the crane, so that the second unloading control valve 22 or the third unloading control valve 23 is controlled to change the direction, pilot oil output by the operating device 1 directly flows to the oil unloading port T through the second unloading control valve 22 or the third unloading control valve 23 to unload the oil, so that the corresponding action is cut off by changing the direction of the main valve 41, the unloading function of the force limiter is realized, and the dangerous actions are.
Generally, a hydraulic handle is adopted as the device 1 on the crane, for convenience of operation, the hydraulic handle is generally divided into a left hydraulic handle and a right hydraulic handle, the left hydraulic handle is provided with a first oil port L1, a second oil port L2, a third oil port L3 and a fourth oil port L4, the right hydraulic handle is provided with a first oil port R1, a second oil port R2, a third oil port R3 and a fourth oil port R4, in the specific embodiment of fig. 1, the fourth oil port L4 and the second oil port L2 of the left hydraulic handle are respectively and correspondingly connected with the third unloading control valve 23 and the second unloading control valve 22, the second oil port R2 and the fourth oil port R4 of the right hydraulic handle are respectively and correspondingly connected with the third unloading control valve 23 and the second unloading control valve 22, an oil path between the fourth oil port L4 of the left hydraulic handle and the third unloading control valve 23, an oil path between the second oil port R2 and the third unloading control valve 23 of the right hydraulic handle, Control oil ports are respectively arranged on an oil path between the second oil port L2 of the left hydraulic handle and the second unloading control valve 22 and an oil path between the fourth oil port R4 of the right hydraulic handle and the second unloading control valve 22 and are used for controlling the reversing of the main valve 41 corresponding to the auxiliary hoisting executing mechanism 52 and the main valve 41 corresponding to the main hoisting executing mechanism 51; the third oil port R3 of the right hydraulic handle is connected with the oil inlet P1 of the first switching control valve 31, and the first oil port R1 of the right hydraulic handle is connected with the oil inlet of the second switching control valve 32, so that pilot oil can be supplied to the first switching control valve 31 and the second switching control valve 32; the first and third ports L1 and L3 of the left hydraulic handle may be used to connect other actuators, such as a swing mechanism of a crane.
For the hydraulic control module, in the specific embodiment, a simple change can be made on the basis of the embodiment of fig. 1, and one unloading control valve can be reduced, for example, the third unloading control valve 23 is eliminated, that is, the unloading control valve group includes two unloading control valves, i.e., the first unloading control valve 21 and the second unloading control valve 22, which are connected in parallel, similarly, the first switching control valve 31 is connected with the operating device 1, and the first switching control valve 31 is connected with the oil unloading port T through the first unloading control valve 21, the second switching control valve 32 is also connected with the operating device 1, the first working oil port a1 and the second working oil a2 of the first switching control valve 31 are connected with the sixth control port b2 of the main valve 41 corresponding to the boom extension/contraction actuating mechanism 53 and the fifth control port b1 of the main valve 41 corresponding to the amplitude variation actuating mechanism 54 through two pilot control ports of the hydraulic control module, the two working oil ports of the second switching control valve 32 are connected with the first control port a1 of the main valve 41 corresponding to the luffing actuator 54 and the second control port a2 of the main valve 41 corresponding to the boom extension actuator 53 in a one-to-one correspondence manner through the two pilot control oil ports of the hydraulic control module, and in the case of normal operation, the operating device 1 pushes the main valve 41 corresponding to the luffing actuator 54 and the main valve 41 corresponding to the boom extension actuator 53 to be reversed through the first switching control valve 31 or the second switching control valve 32, so as to realize luffing and boom extension actions, for example, the first switching control valve 31 is used for controlling luffing and boom extension actions; the first working oil port a1 and the second working oil a2 of the first switching control valve 31 are also respectively connected with the first unloading control valve 21, when dangerous actions occur, the force limiter can monitor the working state of the crane, when the crane reaches the limit state, the force limiter can feed back the working state information of the crane, so that the first unloading control valve 21 is controlled to change direction, an oil path between the first switching control valve 31 and the control port of the corresponding main valve 41 is cut off, the pilot oil is unloaded, the corresponding main valve 41 is changed direction to cut off the corresponding actions, the unloading function of the force limiter is realized, and the dangerous actions are prevented from occurring. The difference is that four oil paths are formed between the second unloading control valve 22 and the operating device 1, four oil paths are respectively provided with a third control port a3 of the main valve 41 corresponding to the auxiliary hoisting actuator 52, a fourth control port a4 of the main valve 41 corresponding to the main hoisting actuator 51, a seventh control port b3 of the main valve 41 corresponding to the auxiliary hoisting actuator 52 and four control oil ports corresponding to the eighth control port b4 of the main valve 41 corresponding to the main hoisting actuator 51, the force limiter can monitor the working state of the crane when dangerous actions occur, and when the crane reaches the limit state, the force limiter feeds back the working state information of the crane to control the second unloading control valve 22 to change direction, so that the pilot oil output by the operating device 1 directly flows to the unloading T through the second unloading control valve 22 to unload the oil, so that the corresponding main valve 41 changes direction and cuts off the corresponding actions, the unloading function of the force limiter is realized, and dangerous actions are prevented; specifically, referring to fig. 1, the fourth oil port L4 and the second oil port L2 of the left hydraulic handle and the second oil port R2 and the fourth oil port R4 of the right hydraulic handle are respectively and correspondingly connected with the second unloading control valve 22; or, two oil paths are formed between the second unloading control valve 22 and the operation device 1, two control oil ports are respectively provided on the two oil paths, one-to-one correspondence to the third control port a3 of the main valve 41 corresponding to the auxiliary hoisting actuator 52 and the fourth control port a4 of the main valve 41 corresponding to the main hoisting actuator 51, two oil paths are formed between the first unloading control valve 21 and the operation device 1, the two oil paths are respectively provided with two control oil ports corresponding to the seventh control port b3 of the main valve 41 corresponding to the auxiliary hoisting actuator 52 and the eighth control port b4 of the main valve 41 corresponding to the main hoisting actuator 51, specifically, referring to fig. 1, the second oil port L2 of the left hydraulic handle and the fourth oil port R4 of the right hydraulic handle are respectively connected to the second unloading control valve 22, and the fourth oil port L4 of the left hydraulic handle and the second oil port R2 of the right hydraulic handle are respectively connected to the first unloading control valve 21.
In some embodiments, it is also possible to change the hydraulic control module based on the embodiment of fig. 1 by providing only one unloading control valve, for example, omitting the second unloading control valve 22 and the third unloading control valve 23, that is, the unloading control valve group is composed of the first unloading control valve 21, similarly, the first switching control valve 31 is connected to the operating device 1, the first switching control valve 31 is connected to the oil unloading port T through the first unloading control valve 21, the second switching control valve 32 is also connected to the operating device 1, the first working oil port a1 and the second working oil a2 of the first switching control valve 31 are connected to the sixth control port b2 of the main valve 41 corresponding to the boom extension/contraction executing mechanism 53 and the fifth control port b1 of the main valve 41 corresponding to the amplitude changing executing mechanism 54 through two pilot control ports of the hydraulic control module, and the two working oil ports of the second switching control valve 32 are connected to the amplitude changing executing mechanism through two pilot control ports of the hydraulic control module one-to one The first control port a1 of the main valve 41 corresponding to the mechanism 54 and the second control port a2 of the main valve 41 corresponding to the boom extension/contraction actuator 53 are connected in a one-to-one correspondence, except that four oil paths are formed between the first unloading control valve 21 and the operating device 1, four oil paths are provided on the four oil paths, respectively, four control ports corresponding to the third control port a3 of the main valve 41 corresponding to the sub-winch actuator 52, the fourth control port a4 of the main valve 41 corresponding to the main winch actuator 51, the seventh control port b3 of the main valve 41 corresponding to the sub-winch actuator 52, and the eighth control port b4 of the main valve 41 corresponding to the main winch actuator 51, and a force limiter is capable of monitoring the operating state of the crane, and when a dangerous operation occurs, the force limiter feeds back the operating state information of the crane, thereby controlling the first unloading control valve 21 to switch and cut off the oil path between the first unloading control valve 31 and the control port of the corresponding main valve 41, the pilot oil is unloaded, and simultaneously, the pilot oil in the four oil paths between the first unloading control valve 21 and the operating device 1 directly flows to the oil unloading port T to be unloaded, so that the corresponding action is stopped, the unloading function of the force limiter is realized, and the dangerous action is prevented.
In some embodiments, it is also possible to change the hydraulic control module based on the embodiment of fig. 1, and only one unloading control valve is provided, and more switching control valves are provided, for example, the second unloading control valve 22 and the third unloading control valve 23 are eliminated, that is, the unloading control valve group is composed of the first unloading control valve 21, and two switching control valves are added, that is, the action switching control valve group is composed of the first switching control valve 31, the second switching control valve 32, the third switching control valve and the fourth switching control valve which are connected in parallel, the first working port a1 and the second working port a2 of the first switching control valve 31, the first working port and the second working port of the third switching control valve, and the first working port and the second working port of the fourth switching control valve are respectively connected to the unloading port T through the first unloading control valve 21, and, the first switching control valve 31, the second switching control valve 32, the third switching control valve and the fourth switching control valve are respectively connected with the operating device 1, the first working oil port a1 and the second working oil port a2 of the first switching control valve 31 are correspondingly connected with the sixth control port b2 of the main valve 41 corresponding to the boom extension and contraction executing mechanism 53 and the fifth control port b1 of the main valve 41 corresponding to the luffing executing mechanism 54 through two pilot control oil ports of a hydraulic control module, the two working oil ports of the second switching control valve 32 are correspondingly connected with the first control port a1 of the main valve 41 corresponding to the luffing executing mechanism 54 and the second control port a2 of the main valve 41 corresponding to the boom extension and contraction executing mechanism 53 through two pilot control oil ports of the hydraulic control module, and the two working oil ports of the third switching control valve are correspondingly connected with the third control port A3 of the main valve 41 corresponding to the auxiliary hoisting executing mechanism 52 and the main valve 41 corresponding to the main hoisting executing mechanism 51 through two pilot control oil ports of the hydraulic control module The two working oil ports of the fourth switching control valve are correspondingly connected with the seventh control port b3 of the main valve 41 corresponding to the auxiliary hoisting executing mechanism 52 and the eighth control port b4 of the main valve 41 corresponding to the main hoisting executing mechanism 51 through the two pilot control oil ports of the hydraulic control module, under the normal operation condition, the oil path between the first unloading control valve 21 and the oil unloading port T is in a disconnected state, and the pilot oil output by the operating device 1 flows into the control ports of the corresponding main valves 41 through the first switching control valve 31, the second switching control valve 32, the third switching control valve and the fourth switching control valve to realize corresponding actions; when dangerous actions occur, the force limiter feeds back the working state information of the crane, so that the first unloading control valve 21 is controlled to change direction, oil passages between the first switching control valve 31, the third switching control valve and the fourth switching control valve and the control port of the corresponding main valve 41 are cut off, pilot oil is unloaded, corresponding actions are stopped, the unloading function of the force limiter is realized, and the dangerous actions are prevented. Of course, the two working ports of the second switching control valve 32 may be connected to the first unloading control valve 21, respectively, and the second switching control valve 32 may be unloaded by the first unloading control valve 21.
Wherein, the oil inlet P1 of the first switching control valve 31 is connected with the operating device 1, and the oil return port T1 of the first switching control valve 31 is connected with the oil discharge port T; furthermore, an oil inlet of the third switching control valve and an oil inlet of the fourth switching control valve are respectively connected with the operating device 1, and an oil return port of the third switching control valve and an oil return port of the fourth switching control valve are respectively connected with the oil discharge port T.
Normally, a filter is arranged between the operating device 1 and the control oil source, and because the pilot oil output by the operating device 1 is low-pressure oil, the requirement on the filter is not high, for example, a common filter screen is used, so that the price is low, the cost is saved, and the filtering precision can be guaranteed; however, in patent application CN102182715A, since the unloading mode is high pressure unloading, even if a filter is provided, a filter for high pressure oil needs to be provided, which is difficult to ensure the filtering precision, affects the cleanliness of oil, and is easy to cause the electromagnetic valve to jam or even cause a shutdown failure.
In the above various embodiments, a crane is taken as an example for explanation, and the hydraulic control module of the present invention is made to correspond to the main hoist actuator 51, the auxiliary hoist actuator 52, the boom extension actuator 53, and the luffing actuator 54, respectively, it is understood that the hydraulic control module of the present invention may correspond to other numbers of actuators, and the correspondence relationship between the unloading control valve group and the operation switching control valve in the hydraulic control module of the present invention and the actuators such as the main hoist actuator 51, the auxiliary hoist actuator 52, the boom extension actuator 53, and the luffing actuator 54 is not limited to the embodiment shown in fig. 1, that is, the correspondence relationship may be changed according to design as long as the operation control and unloading functions can be realized. In addition, in the embodiment of fig. 1, the first unloading control valve 21, the second unloading control valve 22 and the third unloading control valve 23 are two-position four-way solenoid valves, and the above-mentioned structural form of the hydraulic control module of the present invention enables the solenoid valves to control two-action unloading, but of course, the first unloading control valve 21, the second unloading control valve 22 and the third unloading control valve 23 may be two-position two-way valves, two-position three-way valves, etc., and can also realize unloading functions; the first switching control valve 31, the second switching control valve 32, the third switching control valve, and the fourth switching control valve may be two-position four-way solenoid valves.
To facilitate an understanding of the technical concepts and advantages of the hydraulic control system of the present invention, a relatively comprehensive arrangement of the preferred features of the hydraulic control system of the present invention is described below.
As shown in fig. 1 and 2, the control valve set includes an integrated unloading control valve set and an action switching control valve set, the unloading control valve set includes a first unloading control valve 21, a second unloading control valve 22 and a third unloading control valve 23 which are connected in parallel, the first unloading control valve 21, the second unloading control valve 22 and the third unloading control valve 23 are respectively connected with an oil discharge port T, the action switching control valve set includes a first switching control valve 31 and a second switching control valve 32 which are connected in parallel, the operating device 1 is divided into a left hydraulic handle and a right hydraulic handle, an oil path between a fourth oil port L4 of the left hydraulic handle and the third unloading control valve 23, and control oil ports corresponding to a seventh control port b3 of the main valve 41 corresponding to the auxiliary hoisting execution mechanism 52 and an eighth control port b4 of the main valve 41 corresponding to the hoisting execution mechanism 51 are provided on the oil path between a second oil port R2 of the right hydraulic handle and the third unloading control valve 23, the oil path between the second oil port L2 of the left hydraulic handle and the second unloading control valve 22 and the oil path between the fourth oil port R4 of the right hydraulic handle and the second unloading control valve 22 are respectively provided with a control oil port corresponding to the third control port a3 of the main valve 41 connected with the auxiliary hoisting actuator 52 and a control oil port corresponding to the fourth control port a4 of the main valve 41 corresponding to the main hoisting actuator 51; the third oil port R3 of the right hydraulic handle is connected to the oil inlet P1 of the first switching control valve 31, the first oil port R1 of the right hydraulic handle is connected to the oil inlet of the second switching control valve 32, the first working oil port a1 and the second working oil port a2 of the first switching control valve 31 are connected to the sixth control port b2 of the main valve 41 corresponding to the boom extension and contraction actuator 53 and the fifth control port b1 of the main valve 41 corresponding to the luffing actuator 54 through two pilot control oil ports of the hydraulic control module in a one-to-one correspondence manner, the two working oil ports of the second switching control valve 32 are connected to the first control port a1 of the main valve 41 corresponding to the luffing actuator 54 and the second control port a2 of the main valve 41 corresponding to the boom extension and contraction actuator 53 through two pilot control oil ports of the hydraulic control module in a one-to-one manner, and the first working oil port a1 and the second working oil port a2 of the first switching control valve 31 are also connected to the first.
Through the above technical solution, in a normal operation situation, by operating the left hydraulic handle and the right hydraulic handle of the operation device 1, the pilot oil can be directly delivered to the main valve 41 corresponding to the main hoisting actuator 51 and the main valve 41 corresponding to the auxiliary hoisting actuator 52, the actions of the main hoisting and the auxiliary hoisting are controlled through the corresponding main valves 41, and the main valve 41 corresponding to the amplitude-changing actuator 54 and the main valve 41 corresponding to the boom extension actuator 53 can be pushed to change directions through the first switching control valve 31 and the second switching control valve 32, so as to realize amplitude-changing and boom extension and retraction actions; when dangerous actions occur, the force limiter can monitor the working state of the crane, and can feed back the working state information of the crane, so as to control the first unloading control valve 21 to change direction, cut off an oil circuit between the first switching control valve 31 and a corresponding control port of the main valve 41, enable the operating device 1 to be communicated with an oil unloading port T through the second unloading control valve 22 and the third unloading control valve 23, unload pilot oil, limit actions such as main/auxiliary hoisting, amplitude dropping and boom extending, and limit actions such as main/auxiliary hoisting and dropping after a steel wire rope of the crane is released, prevent dangerous actions and ensure the operation safety.
In addition, a complex shuttle valve network or one-way valve network design is cancelled, the action linkage phenomenon caused by the untight sealing of the shuttle valve or the one-way valve can be prevented, and the structural design is effectively simplified. The valve body is relatively simple to process, leakage points are reduced, the oil leakage fault rate is reduced, meanwhile, the unloading mode is low-pressure unloading, the use requirement on the electromagnetic valve is low, the cleanliness of oil can be guaranteed, the fault rate is reduced, and the reliability of system operation is guaranteed; on the whole, the hydraulic control system has the advantages of reliability and cost consideration, good economy and milestone significance in the field of engineering machinery as a novel split type hydraulic control system.
The invention is mainly explained by taking a crane as an example, and it can be understood that the hydraulic control system of the invention can also be applied to other engineering machinery which needs to be controlled by action switching and a force limiter unloading function.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (12)
1. The hydraulic control module is characterized by comprising an oil unloading port (T), a plurality of pilot control oil ports and a control valve group connected with an operating device (1), wherein the control valve group comprises an integrated unloading control valve group and an action switching control valve group, the operating device (1) is connected with the oil unloading port (T) through the unloading control valve group, the operating device (1) is connected with the pilot control oil ports through the action switching control valve group, and the action switching control valve group is connected with the oil unloading port (T) through the unloading control valve group so as to unload pilot oil.
2. The hydraulic control module of claim 1, wherein the set of unloader control valves includes a first unloader control valve (21) and a second unloader control valve (22) connected in parallel, the action switching control valve group comprises a first switching control valve (31) and a second switching control valve (32) which are connected in parallel, the first switching control valve (31) and the second switching control valve (32) are respectively connected with the operating device (1), a first working oil port (A1) and a second working oil port (A2) of the first switching control valve (31) are respectively connected with the oil discharge port (T) through the first unloading control valve (21), so as to unload the pilot oil, the operating device (1) is connected with the oil unloading port (T) through the second unloading control valve (22), a control oil port for outputting pilot oil is arranged on a pilot oil path between the second unloading control valve (22) and the operating device (1).
3. The hydraulic control module according to claim 2, wherein the unloading control valve group further comprises a third unloading control valve (23) connected in parallel with the first unloading control valve (21) and the second unloading control valve (22), the operating device (1) is connected with the oil unloading port (T) through the third unloading control valve (23), and a control oil port for outputting pilot oil is arranged on a pilot oil path between the third unloading control valve (23) and the operating device (1).
4. The hydraulic control module according to claim 1, wherein the unloading control valve group comprises a first unloading control valve (21) and a second unloading control valve (22) connected with the operating device, respectively, the motion switching control valve group comprises a first switching control valve (31) and a second switching control valve (32) connected in parallel, the first switching control valve (31) and the second switching control valve (32) are connected with the operating device (1), respectively, a first working oil port (a1) and a second working oil port (a2) of the first switching control valve (31) are connected with the oil unloading port (T) through the first unloading control valve (21), respectively, the first unloading control valve (21) and the second unloading control valve (22) are disposed between the operating device (1) and the oil unloading port (T), and a pilot oil passage between the first unloading control valve (21) and the operating device (1) and the second unloading control valve (22) are disposed And control oil ports for outputting pilot oil are arranged on the pilot oil path between the valve (22) and the operating device (1).
5. The hydraulic control module according to claim 1, wherein the unloading control valve group comprises a first unloading control valve (21) connected with the operating device (1), the action switching control valve group comprises a first switching control valve (31) and a second switching control valve (32) connected in parallel, the first switching control valve (31) and the second switching control valve (32) are respectively connected with the operating device (1), a first working oil port (A1) and a second working oil port (A2) of the first switching control valve (31) are respectively connected with the unloading port (T) through the first unloading control valve (21), the operating device (1) is connected with the unloading port (T) through the first unloading control valve (21), and a plurality of pilot oil passages are arranged between the first unloading control valve (21) and the operating device (1), so as to unload the pilot oil, and each pilot oil path is provided with a control oil port for outputting the pilot oil.
6. The hydraulic control module according to claim 1, wherein the unloading control valve group comprises a first unloading control valve (21), the action switching control valve group comprises a first switching control valve (31), a second switching control valve (32), a third switching control valve and a fourth switching control valve which are connected in parallel, the first switching control valve (31), the second switching control valve (32), the third switching control valve and the fourth switching control valve are respectively connected with the operating device (1), a first working oil port (A1) and a second working oil port (A2) of the first switching control valve (31), a first working oil port and a second working oil port of the third switching control valve and a first working oil port and a second working oil port of the fourth switching control valve are respectively connected with the unloading oil port (T) through the first unloading control valve (21), to enable unloading of the pilot oil.
7. The hydraulic control module according to claim 6, wherein the oil inlet (P1) of the first switching control valve (31), the oil inlet of the third switching control valve and the oil inlet of the fourth switching control valve are respectively connected with the operating device (1), and the oil return port (T1) of the first switching control valve (31), the oil return port of the third switching control valve and the oil return port of the fourth switching control valve are respectively connected with the oil discharge port (T).
8. The hydraulic control module according to any one of claims 2 to 6, characterized in that the oil inlet (P1) of the first switching control valve (31) is connected with the operating device (1) and the oil return (T1) of the first switching control valve (31) is connected with the oil discharge (T).
9. The hydraulic control module according to any one of claims 1 to 7, characterized in that the operating device (1) is a hydraulic handle.
10. The hydraulic control module according to claim 9, characterized in that a filter is arranged between the operating device (1) and the control oil source.
11. A hydraulic control system, characterized by comprising a pilot valve and a hydraulic control module according to any one of claims 1 to 10, wherein the pilot valve comprises a plurality of working couples (4) connected in one-to-one correspondence with hydraulic actuators, and the hydraulic control module is connected to the control chamber of the main valve (41) of each working couple (4).
12. A working machine, characterized by comprising a hydraulic control system according to claim 11.
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| CN202011578665.2A CN112723166B (en) | 2020-12-28 | 2020-12-28 | Hydraulic control module, hydraulic control system and engineering machinery |
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| CN202011578665.2A CN112723166B (en) | 2020-12-28 | 2020-12-28 | Hydraulic control module, hydraulic control system and engineering machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204284053U (en) * | 2014-11-18 | 2015-04-22 | 徐州重型机械有限公司 | For guide's oil circuit relief arrangement and the pilot hydraulic control system of virtual wall function |
| CN105422530A (en) * | 2014-10-30 | 2016-03-23 | 徐州重型机械有限公司 | Pilot integrated multi-way valve group and crane |
| US20170023025A1 (en) * | 2015-05-07 | 2017-01-26 | Liebherr-Mining Equipment Colmar Sas | Apparatus for the energy-optimized hydraulic control of at least one double-action working cylinder |
| CN110925252A (en) * | 2019-11-18 | 2020-03-27 | 中联重科股份有限公司 | Integrated multi-way valve, lifting hydraulic control system and crane |
-
2020
- 2020-12-28 CN CN202011578665.2A patent/CN112723166B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422530A (en) * | 2014-10-30 | 2016-03-23 | 徐州重型机械有限公司 | Pilot integrated multi-way valve group and crane |
| CN204284053U (en) * | 2014-11-18 | 2015-04-22 | 徐州重型机械有限公司 | For guide's oil circuit relief arrangement and the pilot hydraulic control system of virtual wall function |
| US20170023025A1 (en) * | 2015-05-07 | 2017-01-26 | Liebherr-Mining Equipment Colmar Sas | Apparatus for the energy-optimized hydraulic control of at least one double-action working cylinder |
| CN110925252A (en) * | 2019-11-18 | 2020-03-27 | 中联重科股份有限公司 | Integrated multi-way valve, lifting hydraulic control system and crane |
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