CN109516419B - Safety redundant control device for overhead working truck - Google Patents
Safety redundant control device for overhead working truck Download PDFInfo
- Publication number
- CN109516419B CN109516419B CN201811499120.5A CN201811499120A CN109516419B CN 109516419 B CN109516419 B CN 109516419B CN 201811499120 A CN201811499120 A CN 201811499120A CN 109516419 B CN109516419 B CN 109516419B
- Authority
- CN
- China
- Prior art keywords
- valve
- oil
- electromagnetic reversing
- reversing
- car
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 10
- 238000010276 construction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 59
- 238000010586 diagram Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
- B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
Abstract
The invention provides a safety redundancy control device of an overhead working truck, which at least comprises an unloading valve; the unloading valve is an electromagnetic reversing valve, and a displacement sensor for sensing the position of the valve rod is arranged on the valve rod of the electromagnetic reversing valve. When the controller outputs an unloading command, the electromagnetic reversing valve is powered off, and meanwhile, a displacement sensor in the electromagnetic reversing valve detects whether a valve rod is reset or not, if true, the hydraulic system is unloaded, and the dangerous direction cannot continue to move: for example, an arm is extended, the arm falls, the amplitude is changed, the electromagnetic reversing valve rotates left, and the like, and the displacement sensor detects that the valve rod of the electromagnetic reversing valve is completely reversed, so that the hydraulic system can work normally, and the operation safety is improved. Compared with the prior art, the method is safer and more reliable; and the occurrence of accidents caused by misoperation due to action failure of the hydraulic logic control unit is avoided.
Description
Technical Field
The invention relates to a safety redundant control device of an overhead working truck.
Background
The main control forms of the safety protection of the existing overhead working truck are as follows: the method comprises the steps that sensors (such as a boom angle sensor, an oil cylinder pressure sensor, a rotation angle sensor and a boom length sensor) are arranged on an executing component, data are collected through the sensors and transmitted to a controller (a moment limiter and a force control type controller), and the action of a hydraulic system is controlled through a controller output signal (specifically, a logic control valve electromagnet is powered on or powered off);
because the working personnel of the overhead working truck is a living body and the safety protection is the first, the safety control adopts redundant control;
as shown in fig. 1, a dual-path output type sensor is commonly adopted in the high-altitude vehicle operation industry, and the sensor outputs two paths of signals to a controller at the same time, and the controller outputs a judging instruction after comparing the two paths of signals;
the defects are that: although the command can be accurately output electrically, the execution unit (a logic control valve of the hydraulic system) is likely to malfunction or not execute; for example, electromagnetic directional valves, while powered, do not allow the valve stem to be fully or fully directional due to stem jamming.
The situation is very dangerous, for example, the whole machine is approaching critical tipping and cannot continue to fall to the amplitude, the controller outputs a command of unloading the hydraulic system to enable the amplitude to fall to have no action, but the electromagnetic reversing valve rod is blocked and cannot be reversed, the unloading of the hydraulic system cannot be completed, and the whole machine continues to fall to the amplitude, so that accidents occur.
Disclosure of Invention
The invention aims to solve the technical problem of providing a safety redundant control device for an overhead working truck, which has a simple structure and is safe to use.
In order to solve the technical problems, the invention provides a safety redundancy control device of an overhead working truck, which at least comprises an unloading valve;
the unloading valve is an electromagnetic reversing valve, and a displacement sensor for sensing the position of the valve rod is arranged on the valve rod of the electromagnetic reversing valve.
After the structure is adopted, when the controller outputs an unloading command, the electromagnetic reversing valve is powered off, meanwhile, a displacement sensor in the electromagnetic reversing valve detects whether a valve rod is reset or not, if true, the hydraulic system is unloaded, and the dangerous direction cannot continue to move: for example, an arm is extended, the arm falls, the amplitude is changed, the electromagnetic reversing valve rotates left, and the like, and the displacement sensor detects that the valve rod of the electromagnetic reversing valve is completely reversed, so that the hydraulic system can work normally, and the operation safety is improved. Compared with the prior art, the method is safer and more reliable; and the occurrence of accidents caused by misoperation due to action failure of the hydraulic logic control unit is avoided.
In order to more clearly understand the technical content of the present invention, the present safety redundant control device for an overhead working truck will be hereinafter simply referred to as the present control device.
The control device also comprises an upper and lower car oil supply valve and a turntable oil circuit switching valve, wherein an oil inlet of the upper and lower car oil supply valve is communicated with an oil transmission circuit of a hydraulic system of the overhead working car, an oil return port of the upper and lower car oil supply valve is communicated with an oil return circuit of the hydraulic system of the overhead working car, and two reversing ports of the upper and lower car oil supply valve are respectively communicated with an upper car oil circuit valve group and a lower car oil circuit valve group of the overhead working car;
an oil inlet of the turntable oil way switching valve is communicated with a reversing port of the upper and lower oil supply valve and a pipeline between the upper oil way valve group, an oil return port of the turntable oil way switching valve is communicated with an oil return path of a hydraulic system of the overhead working truck, and two reversing ports of the turntable oil way switching valve are respectively connected with an operation multi-way valve on the turntable of the overhead working truck and an operation multi-way valve in the working bucket; with such a structure, the structure of the control device is more specific.
An overflow valve is arranged between an oil inlet and an oil return port of an on-off oil supply valve of the control device; after adopting such structure, the overflow valve plays the role of constant pressure overflow and pressure stabilization in the control device.
Drawings
FIG. 1 is a control schematic block diagram of a prior art overhead working truck
Fig. 2 is a schematic diagram of a logic control fluid circuit according to an embodiment of the present control device.
Detailed Description
As shown in fig. 2
The control device comprises an unloading valve, an on-off oil supply valve V2 and a turntable oil way switching valve V3.
The unloading valve is an electromagnetic reversing valve V1, the electromagnetic reversing valve V1 comprises a first oil inlet P1, a first oil return port T1, a first reversing port A1 and a second reversing port B1, the first oil return port T1 is communicated with an oil return path of a hydraulic system of the overhead working truck, the first reversing port A1 is connected with an arm extending oil cylinder, an amplitude varying oil cylinder and the like, a check valve can be further arranged on a pipeline between the first reversing port A1 and the arm extending oil cylinder, the amplitude varying oil cylinder and the like, the second reversing port B1 is connected with a slewing mechanism and the like, a check valve can be also arranged on a pipeline between the second reversing port B1 and the slewing mechanism, a displacement sensor M for sensing the position of the valve rod is arranged on a valve rod of the electromagnetic reversing valve V1, and the displacement sensor M transmits a sensing valve rod position signal to a controller of the overhead working truck.
The upper and lower car oil supply valve V2 comprises a second oil inlet P2, a second oil return port T2, a third reversing port A2 and a fourth reversing port B2, the second oil inlet P2 of the upper and lower car oil supply valve V2 is communicated with an oil conveying path of a hydraulic system of the overhead working car, the second oil return port T2 is communicated with an oil return path of the hydraulic system of the overhead working car, the fourth reversing port B2 is connected with a lower car oil way valve group, the third reversing port A2 is connected with the upper car oil way valve group respectively, and an overflow valve V4 is arranged between the second oil inlet P2 of the upper and lower car oil supply valve V2 and the second oil return port T2.
The turntable oil way switching valve V3 comprises a third oil inlet P3, a third oil return port T3, a fifth reversing port A3 and a sixth reversing port B3, the third oil inlet P3 of the turntable oil way switching valve V3 is communicated with the third reversing port A2 of the upper and lower vehicle oil supply valve V2, the third oil return port T3 of the turntable oil way switching valve V3 is communicated with an oil return way of a hydraulic system of the aerial working vehicle, the fifth reversing port A3 is connected with an operation multi-way valve in a working bucket of the aerial working vehicle, and the sixth reversing port B3 is connected with an operation multi-way valve of a turntable of the aerial working vehicle.
When the electromagnetic directional valve V1 is in a power-on state, the first oil inlet P1, the first oil return port T1, the first directional port A1 and the second directional port B1 are disconnected from each other, and when the electromagnetic directional valve V1 is in a power-off state, the first oil inlet P1 is disconnected, and the first directional port A1 and the second directional port B1 are communicated with the first oil return port T1.
The first reversing port A1 and the second reversing port B1 are connected with control hydraulic oil in a dangerous direction: for example, the first reversing port A1 can be connected with a luffing jib; the second reversing port B1 is connected with the left-right rotation;
when the hydraulic system is used, from the safety angle, the unloading electromagnetic reversing valve V1 in the hydraulic system adopts power-off unloading; the unloading electromagnetic valve is powered when the whole machine works normally.
The displacement sensor M detects the position state of a valve rod in the electromagnetic directional valve V1, and the working principle is as follows:
when the electromagnetic reversing valve works normally, the electromagnetic reversing valve V1 is electrified, whether the valve rod of the electromagnetic reversing valve V1 is reversed in place or not is detected, and the complete reversing machine can be operated;
when overload occurs, the electromagnet is powered off, and whether the valve rod of the electromagnetic reversing valve V1 is reset or not is detected.
If the hydraulic system is normally reset, the hydraulic system is unloaded, and the whole machine does not act; if the operation is not carried out, the controller alarms to remind the operator that the operation cannot be continued in the dangerous direction; meanwhile, the controller is temporarily locked, so that misoperation is prevented.
The foregoing is merely one embodiment of the invention, and it should be noted that variations and modifications could be made by those skilled in the art without departing from the principles of the invention, which would also be considered to fall within the scope of the invention.
Claims (1)
1. The utility model provides a high altitude construction car safety redundancy controlling means, includes unloading valve at least, characterized by:
the unloading valve is an electromagnetic reversing valve, and a valve rod of the electromagnetic reversing valve is provided with a displacement sensor for sensing the position of the valve rod;
the upper and lower car oil supply valve is communicated with an oil delivery path of a hydraulic system of the overhead working car, an oil return port of the upper and lower car oil supply valve is communicated with an oil return path of the hydraulic system of the overhead working car, and two reversing ports of the upper and lower car oil supply valve are respectively communicated with an upper car oil path valve group and a lower car oil path valve group of the overhead working car;
an oil inlet of the turntable oil way switching valve is communicated with a reversing port of the upper and lower oil supply valve and a pipeline between the upper oil way valve group, an oil return port of the turntable oil way switching valve is communicated with an oil return path of a hydraulic system of the overhead working truck, and two reversing ports of the turntable oil way switching valve are respectively connected with an operation multi-way valve on the turntable of the overhead working truck and an operation multi-way valve in the working bucket;
an overflow valve is arranged between an oil inlet and an oil return port of the upper and lower vehicle oil supply valve;
when the electromagnetic reversing valve works normally, the electromagnetic reversing valve is electrified, whether the valve rod of the electromagnetic reversing valve is reversed in place or not is detected, and the complete reversing machine can be operated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811499120.5A CN109516419B (en) | 2018-12-08 | 2018-12-08 | Safety redundant control device for overhead working truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811499120.5A CN109516419B (en) | 2018-12-08 | 2018-12-08 | Safety redundant control device for overhead working truck |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109516419A CN109516419A (en) | 2019-03-26 |
| CN109516419B true CN109516419B (en) | 2024-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811499120.5A Active CN109516419B (en) | 2018-12-08 | 2018-12-08 | Safety redundant control device for overhead working truck |
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| Country | Link |
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| CN (1) | CN109516419B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339358B (en) * | 2021-06-29 | 2024-03-12 | 湖南星邦智能装备股份有限公司 | Valve element clamping stagnation detection method and device of hydraulic control valve and overhead working truck |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2703873Y (en) * | 2003-11-07 | 2005-06-08 | 东方汽轮机厂 | Oil-way main-break protective velve assembly for steam turbine safety system |
| WO2014063490A1 (en) * | 2012-10-26 | 2014-05-01 | 中联重科股份有限公司 | Hydraulic system for controlling boom to rotate and control method therefor and concrete pumping equipment |
| WO2015165344A1 (en) * | 2014-04-29 | 2015-11-05 | 三一汽车制造有限公司 | Rotary hydraulic system and concrete conveying pump apparatus |
| CN209815605U (en) * | 2018-12-08 | 2019-12-20 | 安徽柳工起重机有限公司 | Safety redundancy control device for overhead working truck |
-
2018
- 2018-12-08 CN CN201811499120.5A patent/CN109516419B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2703873Y (en) * | 2003-11-07 | 2005-06-08 | 东方汽轮机厂 | Oil-way main-break protective velve assembly for steam turbine safety system |
| WO2014063490A1 (en) * | 2012-10-26 | 2014-05-01 | 中联重科股份有限公司 | Hydraulic system for controlling boom to rotate and control method therefor and concrete pumping equipment |
| WO2015165344A1 (en) * | 2014-04-29 | 2015-11-05 | 三一汽车制造有限公司 | Rotary hydraulic system and concrete conveying pump apparatus |
| CN209815605U (en) * | 2018-12-08 | 2019-12-20 | 安徽柳工起重机有限公司 | Safety redundancy control device for overhead working truck |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109516419A (en) | 2019-03-26 |
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