CN112357772B - Upper limiting method for lifting hook - Google Patents
Upper limiting method for lifting hook Download PDFInfo
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- CN112357772B CN112357772B CN202011315244.0A CN202011315244A CN112357772B CN 112357772 B CN112357772 B CN 112357772B CN 202011315244 A CN202011315244 A CN 202011315244A CN 112357772 B CN112357772 B CN 112357772B
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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
- B66C15/00—Safety gear
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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
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
- B66C1/34—Crane hooks
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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
- B66C13/16—Applications of indicating, registering, or weighing devices
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a method for limiting the position on a lifting hook, wherein after a lifting handle is operated, one path of hydraulic oil pumped out by an oil pump flows to an E port from a B port to drive a winch system to work, the other path of hydraulic oil controls the hydraulic oil to flow to a D port from the B port, flows through a first shuttle valve and a second shuttle valve and enters a control end of a pilot type overflow valve, the pilot type overflow valve is closed, an induction block continuously rises, when the induction block enters an induction range of a proximity switch, the proximity switch sends a signal, a PLC controls the first two-position two-way electromagnetic ball valve to lose power so that an oil path is conducted, the hydraulic oil flowing to the D port from the B port directly returns an oil tank from the second two-position two-way electromagnetic ball valve, the pilot type overflow valve is opened, an output end of the oil pump and an oil return pipeline form a passage, and the hydraulic oil pumped out by the oil pump directly returns to the oil tank, so that the winch system cannot perform lifting action even if the lifting handle is continuously operated, and the purpose of limiting is achieved.
Description
Technical Field
The invention relates to the technical field of cranes, in particular to a limiting method for upper limit of a lifting hook.
Background
Generally, a heavy hammer is arranged between a suspension arm of a crane and a lifting hook and used for assisting in controlling the stop position of the lifting hook, and the conventional scheme is that a travel switch is arranged on the heavy hammer, the lifting hook moves upwards to push an induction block on the lifting hook upwards, the induction block moves upwards to be in contact with the travel switch, the travel switch sends a signal, and a PLC stops the action of the lifting hook; this kind of setting, the response piece does not follow wire rope and removes, long-term the use, and the butter on the wire rope can accumulate between response piece and weight, accumulates to certain amount when the butter, after response piece and weight contact, under the butter adhesion effect, the unable and weight separation of response piece leads to travel switch to be acting on always and damages the structure or the hydraulic system of hoist.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a limiting method on a lifting hook, which solves the problem of reliable limiting of a crane steel wire rope lifting hook component.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for limiting the upper limit of a lifting hook is characterized in that an upper limit system of the lifting hook comprises a mechanical part, a hydraulic system and an electric control system,
the mechanical part comprises a heavy hammer and a steel wire rope hook component, wherein the heavy hammer is provided with a proximity switch, a steel wire rope of the steel wire rope hook component passes through the heavy hammer, the steel wire rope hook component comprises a pulley, the pulley is provided with a sensing block matched with the proximity switch,
the hydraulic system comprises an oil tank, an oil pump, a multi-way valve bank and a winch system, wherein the input end of the oil pump is connected to the oil tank, an oil return pipeline is arranged on the oil tank, the output end of the oil pump is connected with the multi-way valve bank, the winch system is connected with the multi-way valve bank, and the multi-way valve bank is also connected with the oil return pipeline of the oil tank; the multi-way valve group comprises a three-position seven-way flashlight control reversing valve, a two-position two-way electromagnetic ball valve I, a two-position two-way electromagnetic ball valve II, a shuttle valve I, a shuttle valve II, a hydraulic control one-way valve and a pilot overflow valve; the three-position seven-way manual-electric control reversing valve comprises a port A, a port B, a port C, a port D, a port E, a port F and a port G;
the electric control system comprises a junction box and a PLC, and the proximity switch is connected with the junction box; the junction box is connected with the PLC; the PLC is connected with the two-position two-way electromagnetic ball valve I; the PLC is connected with a two-position two-way electromagnetic ball valve II,
the method for limiting the upper limit of the lifting hook comprises the following steps:
s1, early preparation: the method comprises the steps of positioning an operator, starting a power supply, starting an oil pump and checking an instrument;
s2, operating a lifting pulley of the lifting handle; the lifting handle is operated to the left side of the three-position seven-way flashlight controlled reversing valve, hydraulic oil pumped by the oil pump enters the three-position seven-way flashlight controlled reversing valve through the hydraulic control one-way valve and the port B of the three-position seven-way flashlight controlled reversing valve, one path of hydraulic oil flows to the port E from the port B to drive the winch system to work, the induction block rises along with the pulley, the other path of hydraulic oil controls the hydraulic oil to flow to the port D from the port B and flow to the first input end of the first shuttle valve, because the oil path of the first two-position two-way electromagnetic ball valve in a normal power-on state is closed, the hydraulic oil does not flow through a return oil tank of the two-position two-way electromagnetic ball valve, the hydraulic oil flows to the second shuttle valve after passing through the first shuttle valve, flows out from the output end of the second shuttle valve and is communicated with the control end of the pilot type overflow valve, and the pilot type overflow valve is closed, when the winch system continues to work, the induction block continues to ascend along with the pulley, when the induction block enters an induction range of the proximity switch, the proximity switch sends a signal and transmits the signal to the PLC through the junction box, the PLC controls the two-position two-way electromagnetic ball valve to lose power, the two-position two-way electromagnetic ball valve loses power one by one, an oil way of the two-position two-way electromagnetic ball valve is conducted, control hydraulic oil flowing from the port B to the port D directly returns to an oil tank from the two-position two-way electromagnetic ball valve without passing through the shuttle valve one, the control end of the pilot type overflow valve has no oil pressure, the pilot type overflow valve is opened, an output end of the oil pump and an oil return pipeline form a passage, and the hydraulic oil pumped out by the oil pump directly returns to the oil tank through the pilot type overflow valve without passing through the hydraulic control one-way valve;
and S3, turning off the oil pump, turning off the power supply and evacuating the operator.
According to the method, when the pilot overflow valve is opened, the output end of the oil pump and the oil return pipeline form a passage, hydraulic oil directly returns to the oil tank through the pilot overflow valve, even if the lifting handle is continuously operated, the winch system cannot perform lifting action, and therefore the limiting purpose is achieved.
Further, the cross section of the heavy hammer is circular; the number of the proximity switches is two, and the two proximity switches are symmetrically arranged relative to the vertical center line of the heavy hammer.
With the structure, the heavy hammer with the circular cross section is easy to process; two proximity switches are symmetrically arranged to be redundant with each other, so that the limit double insurance is ensured, and the limit function is realized more safely and reliably.
Furthermore, a hydraulic control one-way valve is arranged between the output end of the oil pump and the three-position seven-way hand-operated reversing valve, the input end of the hydraulic control one-way valve is connected with the output end of the oil pump, the output end of the hydraulic control one-way valve is connected with the port B of the three-position seven-way hand-operated reversing valve, and the control end of the hydraulic control one-way valve is connected with the right input end of the shuttle valve II.
The hydraulic control one-way valve is arranged, the three-position seven-way manual control reversing valve can be protected, high-pressure hydraulic oil is prevented from directly impacting the three-position seven-way manual control reversing valve, and pressure between the output end of the oil pump and the oil inlet end of the three-position seven-way manual control reversing valve can be balanced.
Furthermore, an overflow valve is arranged between the first input end of the first shuttle valve and the oil return pipeline, and the overflow valve is arranged at the position to control the pressure of the hydraulic oil flowing through the shuttle valve.
Furthermore, a pressure reducing valve and a sequence valve are sequentially arranged between the input end of the pilot overflow valve and the oil return pipeline, and the pressure reducing valve is arranged to reduce the oil pressure flowing through the pilot overflow valve and protect the pilot overflow valve; the sequence valve arranged here is an internal control internal release sequence valve which is used as a back pressure valve to stabilize the pressure of an oil way.
Furthermore, a pressure gauge is arranged between the input end of the pilot overflow valve and the input end of the pressure reducing valve through a quick-change connector with a check valve, the arrangement can ensure that the oil way is blocked by the check valve before the pressure gauge is replaced and detached, leakage is prevented, quick replacement is realized, and the pressure gauge can visually display the oil pressure in the oil way.
Further, step S2 further includes: when the three-position seven-way flashlight control reversing valve is operated to be located at the middle position, the end B of the hydraulic control one-way valve is closed, the control end of the pilot type overflow valve is free of hydraulic oil, so that the pilot type overflow valve is opened, the hydraulic oil and the pilot type overflow valve directly return to the oil tank, and due to the arrangement, when the crane does not lift goods, the three-position seven-way flashlight control reversing valve, the pilot type overflow valve and the like are free of oil pressure, and the service life can be effectively prolonged.
Drawings
FIG. 1 is a schematic structural view of a mechanical part in the present invention;
FIG. 2 is an enlarged view at Y in FIG. 1;
FIG. 3 is a schematic diagram of a hydraulic system of the present invention;
FIG. 4 is an enlarged view at W in FIG. 3;
FIG. 5 is a schematic view of each interface of the three-position seven-way manual control reversing valve in the invention;
fig. 6 is a schematic diagram of an electronic control system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 6, an upper limit limiting method of a hook includes a mechanical portion, a hydraulic system, and an electric control system.
The mechanical part comprises a heavy hammer 11 and a steel wire rope hook component 12, wherein the heavy hammer 11 is provided with two proximity switches 111, in the embodiment, the steel wire rope hook component comprises a tackle 112 and a steel wire rope 113, the steel wire rope 113 penetrates through the heavy hammer 11, the tackle 112 is provided with a sensing surface matched with the proximity switches 111, in the embodiment, the tackle 112 is provided with a sensing block 114, and the proximity switches 111 are matched with the sensing block 114.
Hydraulic system includes oil tank 20, oil pump 21, multichannel valves and winch system 23, and oil pump 21's input is connected to oil tank 20, is equipped with back oil pipe way 24 on the oil tank 20, and oil pump output 211 links to each other with the multichannel valves, and winch system 23 links to each other with the multichannel valves, and the multichannel valves still links to each other with oil tank 20's back oil pipe way 24.
The multi-way valve group comprises a three-position seven-way manual control reversing valve 22, a two-position two-way electromagnetic ball valve I25, a two-position two-way electromagnetic ball valve II 26, a shuttle valve I27, a shuttle valve II 28 and a pilot overflow valve 29; the three-position seven-way manual-electric control reversing valve 22 comprises a port A, a port B, a port C, a port D, a port E, a port F and a port G, the port B is connected with the output end of the oil pump 21, and the input end of the pilot overflow valve 29 is connected with the output end of the oil pump 21; the port A is connected with an oil return pipeline 24; the port C is connected with an oil return pipeline 24; the port D is connected with a first input end 271 of a first shuttle valve 27, the output end of the first shuttle valve 27 is connected with a right input end 282 of a second shuttle valve 28, the output end of the second shuttle valve 28 is connected with the control end of the pilot overflow valve 29, the first input end 271 of the first shuttle valve 27 is connected with the input end of a first two-position two-way electromagnetic ball valve, and the output end of the first two-position two-way electromagnetic ball valve is connected with the oil return pipeline 24; the output end of the pilot overflow valve 29 is connected with the oil return pipeline 24; the port E is connected with the input end of a winch system 23; the port F is connected with the output end of the winch system 23; the G port is connected with a second input end 272 of the first shuttle valve 27, and the second input end 272 of the first shuttle valve 27 is also connected with an input end of the second two-position two-way electromagnetic ball valve 26; the output end of the two-position two-way electromagnetic ball valve II 26 is connected with an oil return pipeline.
The electric control system comprises a junction box JB1 and a PLC, wherein one proximity switch 111 is connected with an X5 terminal on the junction box JB1, the other proximity switch 111 is connected with an X11 terminal on the junction box JB1, the PLC supplies power to the junction box JB1, the X5 terminal and the X11 terminal on the junction box JB1 are respectively connected with corresponding terminals on the PLC, and the PLC is respectively connected with a first two-position two-way electromagnetic ball valve 25 and a second two-position two-way electromagnetic ball valve 26.
In the scheme, the cross section of the heavy hammer 11 is circular; the number of the proximity switches 111 is two, the two proximity switches 111 are symmetrically arranged relative to the vertical center line of the heavy hammer 11, and the heavy hammer with a circular cross section is easy to process; two proximity switches are symmetrically arranged to be redundant, and when one proximity switch is sensed, the limiting can be achieved, so that the limiting double insurance is guaranteed, and the limiting function is achieved more safely and reliably.
A hydraulic control one-way valve 31 is arranged between the output end 211 of the oil pump and the three-position seven-way manual control reversing valve 22, the input end of the hydraulic control one-way valve 31 is connected with the output end 211 of the oil pump, the output end 31 of the hydraulic control one-way valve is connected with the port B of the three-position seven-way manual control reversing valve 22, the control end of the hydraulic control one-way valve 31 is connected with the right input end 282 of the second shuttle valve 28, the hydraulic control one-way valve 31 is arranged to protect the three-position seven-way manual control reversing valve 22, high-pressure hydraulic oil is prevented from directly impacting the three-position seven-way manual control reversing valve 22, and pressure between the output end of the oil pump and the oil inlet end of the three-position seven-way manual control reversing valve can be balanced.
A relief valve 32 is provided between the first input 271 of the first shuttle valve and the return line 24, where the relief valve 32 is provided to control the pressure of the hydraulic oil flowing through both shuttle valves.
A pressure reducing valve 33 and a sequence valve 34 are sequentially arranged between the input end of the pilot overflow valve 29 and the oil return pipeline 24, and the pressure reducing valve 33 is arranged to reduce the oil pressure flowing through the pilot overflow valve 29 and protect the pilot overflow valve 29; the sequence valve 34 provided here is an internal control internal relief sequence valve, and is used as a back pressure valve to stabilize the oil line pressure.
When the winch works, the three-position seven-way manual control reversing valve 22 is operated to the left, the oil pump 21 is started, hydraulic oil enters the three-position seven-way manual control reversing valve 22 through the hydraulic control one-way valve 31 and the port B of the three-position seven-way manual control reversing valve 22, one path of hydraulic oil flows to the port E from the port B to drive the winch system to work, the induction block 114 rises along with a lifting hook, the other path of hydraulic oil controls the hydraulic oil to flow to the port D from the port B and flow to the first input end 271 of the first shuttle valve, because the oil path of the first two-position two-way electromagnetic ball valve 25 in a normal power-on state is closed, the hydraulic oil does not flow to the oil return tank of the first two-position two-way electromagnetic ball valve 25, the hydraulic oil flows to the second shuttle valve 28 after passing through the first shuttle valve 27 and flows out from the output end of the second shuttle valve 28 and is communicated with the control end of the pilot overflow valve 29, the pilot overflow valve 29 is closed, the hydraulic oil cannot return to the oil return tank through the pilot overflow valve 29, and when the winch system continues to work, the induction block 114 continues to rise along with the lifting hook, when the induction block 114 enters the induction range of the proximity switch 111, the proximity switch 111 sends a signal, the signal is transmitted to the PLC through the junction box, the PLC controls the first two-position two-way electromagnetic ball valve 25 to lose power, the first two-position two-way electromagnetic ball valve 25 loses power, the oil path of the first two-position two-way electromagnetic ball valve 25 is conducted, the control hydraulic oil flowing from the port B to the port D directly returns to the oil tank from the first two-position two-way electromagnetic ball valve 25 without passing through the shuttle valve 27, the control end of the pilot overflow valve 29 has no oil pressure, the pilot overflow valve 29 is opened, the output end of the oil pump and the oil return pipeline form a passage, the hydraulic oil does not pass through the pilot overflow valve 31 but directly returns to the oil tank through the pilot overflow valve 29, therefore, even if the handle is continuously operated, the winch system cannot do lifting action, and the purpose of limiting is achieved, the proximity switch is used in the scheme, the operation of the winch system can be stopped only by the sensing block being close to the proximity switch on the heavy hammer, and the sensing block is not in contact with the heavy hammer, so that the grease cannot adhere the sensing block and the heavy hammer, and the winch is prevented from being continuously wound to cause damage to a structural part or a hydraulic system.
Claims (7)
1. A method for limiting the upper limit of a lifting hook is characterized in that an upper limit system of the lifting hook comprises a mechanical part, a hydraulic system and an electric control system,
the mechanical part comprises a heavy hammer and a steel wire rope hook component, wherein the heavy hammer is provided with a proximity switch, a steel wire rope of the steel wire rope hook component passes through the heavy hammer, the steel wire rope hook component comprises a pulley, the pulley is provided with a sensing block matched with the proximity switch,
the hydraulic system comprises an oil tank, an oil pump, a multi-way valve group and a winch system, wherein the input end of the oil pump is connected to the oil tank, an oil return pipeline is arranged on the oil tank, the output end of the oil pump is connected with the multi-way valve group, the winch system is connected with the multi-way valve group, and the multi-way valve group is also connected with the oil return pipeline of the oil tank; the multi-way valve group comprises a three-position seven-way manual control reversing valve, a two-position two-way electromagnetic ball valve I, a two-position two-way electromagnetic ball valve II, a shuttle valve I, a shuttle valve II, a hydraulic control one-way valve and a pilot overflow valve; the three-position seven-way flashlight controlled reversing valve comprises a port A, a port B, a port C, a port D, a port E, a port F and a port G; the port B is connected with the output end of the oil pump, and the input end of the pilot overflow valve is connected with the output end of the oil pump; the port A is connected with an oil return pipeline; the port C is connected with an oil return pipeline; the port D is connected with a first input end of a first shuttle valve, an output end of the first shuttle valve is connected with a right input end of a second shuttle valve, an output end of the second shuttle valve is connected with a control end of a pilot type overflow valve, a first input end of the first shuttle valve is connected with an input end of a first two-position two-way electromagnetic ball valve, and an output end of the first two-position two-way electromagnetic ball valve is connected with an oil return pipeline; the output end of the pilot overflow valve is connected with an oil return pipeline; the port E is connected with the input end of the winch system; the F port is connected with the output end of the winch system; the G port is connected with the second input end of the first shuttle valve, and the second input end of the first shuttle valve is also connected with the input end of the second two-position two-way electromagnetic ball valve; the output end of the two-position two-way electromagnetic ball valve II is connected with an oil return pipeline;
the electric control system comprises a junction box and a PLC, and the proximity switch is connected with the junction box; the junction box is connected with the PLC; the PLC is connected with the two-position two-way electromagnetic ball valve I; the PLC is connected with a two-position two-way electromagnetic ball valve II,
the method for limiting the upper limit of the lifting hook comprises the following steps:
s1, early preparation: the method comprises the steps of positioning an operator, starting a power supply, starting an oil pump and checking an instrument;
s2, operating a lifting handle lifting pulley; the lifting handle is operated to the left side of the three-position seven-way manual control reversing valve, hydraulic oil pumped out by the oil pump enters the three-position seven-way manual control reversing valve through the hydraulic control one-way valve and the port B of the three-position seven-way manual control reversing valve, one path of hydraulic oil flows to the port E from the port B to drive the winch system to work, the induction block ascends along with the pulley, the other path of hydraulic oil controls the hydraulic oil to flow to the port D from the port B and flow to the first input end of the shuttle valve I, because the oil path of the two-position two-way electromagnetic ball valve I in a normal power-on state is closed, the hydraulic oil does not flow through the oil return tank of the two-position two-way electromagnetic ball valve, the hydraulic oil flows to the shuttle valve II after passing through the shuttle valve I, flows out from the output end of the shuttle valve II and is communicated with the control end of the pilot overflow valve, and the pilot overflow valve is closed, when the winch system continues to work, the induction block continues to ascend along with the pulley, when the induction block enters an induction range of the proximity switch, the proximity switch sends a signal and transmits the signal to the PLC through the junction box, the PLC controls the two-position two-way electromagnetic ball valve to lose power, the two-position two-way electromagnetic ball valve loses power one by one, an oil way of the two-position two-way electromagnetic ball valve is conducted, control hydraulic oil flowing from the port B to the port D directly returns to an oil tank from the two-position two-way electromagnetic ball valve without passing through the shuttle valve one, the control end of the pilot type overflow valve has no oil pressure, the pilot type overflow valve is opened, an output end of the oil pump and an oil return pipeline form a passage, and the hydraulic oil pumped out by the oil pump directly returns to the oil tank through the pilot type overflow valve without passing through the hydraulic control one-way valve;
and S3, turning off the oil pump, turning off the power supply and evacuating the operator.
2. A method as claimed in claim 1, wherein the method further comprises: the cross section of the heavy hammer is circular; the number of the proximity switches is two, and the two proximity switches are symmetrically arranged relative to the vertical center line of the heavy hammer.
3. A method of limiting an upper limit on a hook as claimed in claim 1, wherein: and a hydraulic control one-way valve is arranged between the output end of the oil pump and the three-position seven-way hand-operated reversing valve, the input end of the hydraulic control one-way valve is connected with the output end of the oil pump, the output end of the hydraulic control one-way valve is connected with the port B of the three-position seven-way hand-operated reversing valve, and the control end of the hydraulic control one-way valve is connected with the right input end of the shuttle valve II.
4. A method of limiting an upper limit on a hook as claimed in claim 1, wherein: an overflow valve is arranged between the first input end of the first shuttle valve and the oil return pipeline.
5. A method as claimed in claim 1, wherein the method further comprises: a pressure reducing valve and a sequence valve are sequentially arranged between the input end of the pilot overflow valve and the oil return pipeline.
6. A method of limiting an upper limit on a hook as claimed in claim 5, wherein: a pressure gauge is arranged between the input end of the pilot overflow valve and the input end of the pressure reducing valve through a quick-change connector with a one-way valve.
7. A method of limiting an upper limit on a hook as claimed in claim 1, wherein: the step S2 further comprises the following steps: when the three-position seven-way manual-electric control reversing valve is operated to be in the middle position, the end B of the hydraulic control one-way valve is closed, and the control end of the pilot type overflow valve is free of hydraulic oil, so that the pilot type overflow valve is opened, and the hydraulic oil and the pilot type overflow valve directly return to the oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315244.0A CN112357772B (en) | 2020-11-20 | 2020-11-20 | Upper limiting method for lifting hook |
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| CN202011315244.0A CN112357772B (en) | 2020-11-20 | 2020-11-20 | Upper limiting method for lifting hook |
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| CN112357772B true CN112357772B (en) | 2022-11-29 |
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| JP2020037480A (en) * | 2018-09-05 | 2020-03-12 | コベルコ建機株式会社 | Crane and crane control method |
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| JP2012076919A (en) * | 2010-10-06 | 2012-04-19 | Hitachi Sumitomo Heavy Industries Construction Crane Co Ltd | Malfunction prevention device of working machine |
| CN201932833U (en) * | 2010-10-08 | 2011-08-17 | 南通润邦重机有限公司 | Crane with approach switches |
| CN102942117A (en) * | 2012-11-20 | 2013-02-27 | 抚顺起重机制造有限责任公司 | Handle inhibition protection system for condition with lowering of empty hook of crane |
| CN207566752U (en) * | 2017-11-30 | 2018-07-03 | 中船华南船舶机械有限公司 | A kind of crane emergency operations system |
| CN108423550B (en) * | 2017-11-30 | 2019-10-15 | 中船华南船舶机械有限公司 | A kind of crane |
| CN109231051B (en) * | 2018-09-29 | 2020-06-05 | 武汉船用机械有限责任公司 | Safety self-locking and remote emergency hydraulic system for high-position winch and operation method of safety self-locking and remote emergency hydraulic system |
| CN109292631B (en) * | 2018-10-31 | 2020-03-27 | 中船华南船舶机械有限公司 | Crane control system and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202107451U (en) * | 2011-05-21 | 2012-01-11 | 烟台宝钢钢管有限责任公司 | Upper limitation protecting device for lifting of travelling crane |
| CN104925685A (en) * | 2015-06-30 | 2015-09-23 | 中国船舶重工集团公司第七一九研究所 | Winch hydraulic system controlling guide rope through stepless speed regulating constant tension |
| CN209226480U (en) * | 2018-05-31 | 2019-08-09 | 江苏格雷特起重机械有限公司 | Utilize the device of wirerope horizontal displacement collision position limitation protection reel raising limes superiors |
| JP2020037480A (en) * | 2018-09-05 | 2020-03-12 | コベルコ建機株式会社 | Crane and crane control method |
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| CN112357772A (en) | 2021-02-12 |
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