CN108661809B - Overspeed protection control system and control method for engine of explosion-proof forklift - Google Patents
Overspeed protection control system and control method for engine of explosion-proof forklift Download PDFInfo
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- CN108661809B CN108661809B CN201810289997.5A CN201810289997A CN108661809B CN 108661809 B CN108661809 B CN 108661809B CN 201810289997 A CN201810289997 A CN 201810289997A CN 108661809 B CN108661809 B CN 108661809B
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- Prior art keywords
- explosion
- proof
- engine
- controller
- stay wire
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D2011/101—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles
- F02D2011/103—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles at least one throttle being alternatively mechanically linked to the pedal or moved by an electric actuator
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The invention discloses an explosion-proof forklift engine overspeed protection control system and a control method, comprising an explosion-proof generator, a controller, an explosion-proof air inlet stop valve, an explosion-proof accelerator motor, an explosion-proof fuel oil cut-off electromagnetic valve, a stay wire linkage mechanism and a manual flameout stay wire assembly; the explosion-proof generator and the explosion-proof throttle motor are both electrically connected with the controller, the explosion-proof fuel oil cut-off solenoid valve is electrically connected with the controller, the explosion-proof throttle motor and the explosion-proof air inlet stop valve are both connected with the stay wire linkage mechanism through stay wires, and the manual flameout stay wire assembly is connected with the stay wire linkage mechanism through the stay wires. The invention has the characteristics of automatically judging the overspeed of the engine and finishing the active flameout of the engine.
Description
Technical Field
The invention relates to the technical field of forklift explosion prevention, in particular to an explosion-proof forklift engine overspeed protection control system and an explosion-proof forklift engine overspeed protection control method capable of automatically judging engine overspeed and finishing active flameout of an engine.
Background
Under the dangerous environment containing combustible gas, combustible dust and both, when the engine of the forklift is in an overspeed condition, the temperature and the engine speed of the whole forklift are out of control, and if the highest surface temperature exceeds the lowest ignition temperature of the combustible gas mixture or the combustible dust, the combustible substances attached to the surface of the forklift can be ignited; while the sparks from the impact due to the runaway engine speed tend to ignite the combustible gas mixture as well as the combustible dust. Therefore, the design of the internal combustion explosion-proof forklift should ensure that the engine can be automatically or manually forced to be flamed out when the engine is in an overspeed condition, and the dangerous conditions of overhigh temperature of the whole forklift, incontrollable rotating speed of the engine and the like caused by overspeed of the engine are thoroughly avoided.
Disclosure of Invention
The invention provides an explosion-proof forklift engine overspeed protection control system and a control method, which can automatically judge the engine overspeed and finish the active flameout of an engine, in order to overcome the problem that dangerous conditions such as overhigh temperature of a forklift and incontrollable rotating speed of the engine occur due to the overspeed of the engine in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an explosion-proof forklift engine overspeed protection control system comprises an explosion-proof generator, a controller, an explosion-proof air inlet stop valve, an explosion-proof accelerator motor, an explosion-proof fuel oil cut-off electromagnetic valve, a stay wire linkage mechanism and a manual flameout stay wire assembly; the explosion-proof generator and the explosion-proof throttle motor are both electrically connected with the controller, the explosion-proof fuel oil cut-off solenoid valve is electrically connected with the controller, the explosion-proof throttle motor and the explosion-proof air inlet stop valve are both connected with the stay wire linkage mechanism through stay wires, and the manual flameout stay wire assembly is connected with the stay wire linkage mechanism through the stay wires.
The explosion-proof air inlet stop valve is used for controlling air inlet of an engine, the explosion-proof fuel oil cut-off electromagnetic valve is used for controlling oil supply of an oil way of the engine, and the manual flameout stay wire assembly is used for forcibly and manually closing the explosion-proof air inlet stop valve in an emergency so as to ensure the safety of a vehicle. The invention has the characteristics of automatically judging the overspeed of the engine and finishing the active flameout of the engine.
Preferably, the explosion-proof air inlet stop valve comprises a stop valve shell, a sealing plate is arranged in the stop valve shell, a link mechanism is arranged on one side of the sealing plate, and the link mechanism is connected with the stay wire linkage mechanism through a stay wire. When the pull wire is pulled, the connecting rod mechanism rotates anticlockwise to drive the sealing plate to move horizontally and rightwards until the sealing plate is completely contacted with the inner side of the stop valve shell, and air flow is blocked inside the stop valve, so that the aim of cutting off air inlet of an engine is fulfilled.
Preferably, the middle part of the sealing plate is provided with a sleeve, and the sealing plate is connected with the connecting rod mechanism in a sliding mode through the sleeve. The shrouding and link mechanism sliding connection for when link mechanism anticlockwise rotation, can drive the shrouding level and move right.
Preferably, the invention also comprises a buzzer and an LED warning lamp, wherein the buzzer and the LED warning lamp are both electrically connected with the controller. When the engine cannot be automatically flamed out in an emergency, the controller controls the buzzer to give out an alarm sound, the LED warning lamp flickers to prompt a driver to use the manual flameout stay wire assembly, and the explosion-proof air inlet stop valve is forcibly and manually closed to complete flameout of the engine.
A control method of an overspeed protection control system of an explosion-proof forklift engine comprises the following steps:
(5-1) presetting a forklift engine rotating speed explosion-proof limit value in the controller, receiving a rotating speed signal sent by the explosion-proof generator in real time by the controller, and calculating according to the speed ratio of an engine fan wheel and the explosion-proof generator fan wheel to obtain the current rotating speed of the engine;
(5-2) comparing the engine rotating speed obtained by calculation in the step (5-1) with a forklift engine rotating speed explosion-proof limit value preset in the controller by the controller, and if the obtained engine rotating speed is lower than the limit value preset in the controller, controlling the explosion-proof accelerator motor not to supply power and controlling explosion-proof fuel oil to cut off the normal power supply of the electromagnetic valve so that the explosion-proof air inlet stop valve is normally opened, an engine oil way normally supplies oil and the engine normally runs;
(5-3) if the rotating speed of the engine is higher than a preset limit value in the controller, the controller controls the explosion-proof fuel oil to cut off the power supply of the electromagnetic valve, the oil supply of an engine oil path is stopped, meanwhile, the controller supplies power to the explosion-proof throttle motor, the explosion-proof throttle motor starts to work, a pull wire of the explosion-proof throttle motor pulls a connecting rod mechanism of the explosion-proof air inlet stop valve through a pull wire linkage mechanism to forcibly close the air inlet stop valve, and the engine is ensured to be completely flameout.
Preferably, the control method of the overspeed protection control system of the explosion-proof forklift engine further comprises the following steps:
when the controller controls the explosion-proof fuel oil to cut off the power supply of the electromagnetic valve and supplies power to the explosion-proof accelerator motor for T time, the engine still cannot automatically flameout, the controller controls the buzzer to give out alarm sound, the LED warning lamp flickers, and a driver is prompted to use the manual flameout stay wire assembly to manually complete flameout of the engine. The T time ranges from 5 seconds to 10 seconds.
Therefore, the invention has the following beneficial effects: (1) the engine can be automatically or manually forced to be flamed out when the engine has an overspeed condition; (2) safe and reliable and easy to install and maintain.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present invention;
FIG. 2 is a schematic diagram of the explosion-proof air inlet shutoff valve of the present invention;
fig. 3 is a flow chart of the present invention.
In the figure: the explosion-proof power generator comprises an explosion-proof power generator 1, a controller 2, an explosion-proof air inlet stop valve 3, an explosion-proof throttle motor 4, an explosion-proof fuel oil cut-off electromagnetic valve 5, a stay wire linkage mechanism 6, a manual flameout stay wire assembly 7, a stop valve shell 8, a sealing plate 9, a connecting rod mechanism 10 and a stay wire 11.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings:
the overspeed protection control system of the explosion-proof forklift engine shown in fig. 1 comprises an explosion-proof generator 1, a controller 2, an explosion-proof air inlet stop valve 3, an explosion-proof accelerator motor 4, an explosion-proof fuel cut-off electromagnetic valve 5, a stay wire linkage mechanism 6 and a manual flameout stay wire assembly 7; the explosion-proof generator and the explosion-proof throttle motor are both electrically connected with the controller, the explosion-proof fuel oil cut-off solenoid valve is electrically connected with the controller, the explosion-proof throttle motor and the explosion-proof air inlet stop valve are both connected with the stay wire linkage mechanism through stay wires 11, and the manual flameout stay wire assembly is connected with the stay wire linkage mechanism through the stay wires.
As shown in fig. 2, the explosion-proof air inlet stop valve comprises a stop valve housing 8, a sealing plate 9 is arranged in the stop valve housing, a link mechanism 10 is arranged on one side of the sealing plate, and the link mechanism is connected with a stay wire linkage mechanism through a stay wire. When the pull wire is pulled, the connecting rod mechanism rotates anticlockwise to drive the sealing plate to move horizontally and rightwards until the sealing plate is completely contacted with the inner side of the stop valve shell, and air flow is blocked inside the stop valve, so that the aim of cutting off air inlet of an engine is fulfilled. The middle part of the sealing plate is provided with a sleeve, and the sealing plate is connected with the connecting rod mechanism in a sliding way through the sleeve. The shrouding and link mechanism sliding connection for when link mechanism anticlockwise rotation, can drive the shrouding level and move right.
In addition, the system also comprises a buzzer and an LED warning lamp, wherein the buzzer and the LED warning lamp are electrically connected with the controller. When the engine cannot be automatically flamed out in an emergency, the controller controls the buzzer to give out an alarm sound, the LED warning lamp flickers to prompt a driver to use the manual flameout stay wire assembly, and the explosion-proof air inlet stop valve is forcibly and manually closed to complete flameout of the engine.
The control method of the overspeed protection control system for the engine of the explosion-proof forklift shown in fig. 3 comprises the following steps:
step 110, comparing the engine rotating speed obtained by calculation in the step 100 with an explosion-proof limit value of the rotating speed of the forklift engine preset in the controller by the controller, and if the obtained engine rotating speed is lower than the limit value preset in the controller, controlling the explosion-proof accelerator motor not to supply power and controlling the explosion-proof fuel oil to cut off the normal power supply of the electromagnetic valve so that the explosion-proof air inlet stop valve is normally opened, the oil way of the engine normally supplies oil and the engine normally runs;
and step 130, when the controller controls the explosion-proof fuel oil to cut off the power supply of the electromagnetic valve and supplies power to the explosion-proof accelerator motor for 5-10 seconds, and the engine still cannot automatically flameout, the controller controls the buzzer to give out alarm sound, the LED warning lamp flickers, and a driver is prompted to use a manual flameout stay wire assembly to manually complete flameout of the engine.
It should be understood that this example is for illustrative purposes only and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (6)
1. An explosion-proof forklift engine overspeed protection control system is characterized by comprising an explosion-proof generator (1), a controller (2), an explosion-proof air inlet stop valve (3), an explosion-proof accelerator motor (4), an explosion-proof fuel oil cut-off electromagnetic valve (5), a stay wire linkage mechanism (6) and a manual flameout stay wire assembly (7); the explosion-proof generator and the explosion-proof accelerator motor are both electrically connected with the controller, the explosion-proof fuel oil cut-off electromagnetic valve is electrically connected with the controller, the explosion-proof accelerator motor and the explosion-proof air inlet stop valve are both connected with the stay wire linkage mechanism through stay wires (11), and the manual flameout stay wire assembly is connected with the stay wire linkage mechanism through the stay wires; the explosion-proof air inlet stop valve comprises a stop valve shell (8), a sealing plate (9) is arranged in the stop valve shell, a connecting rod mechanism (10) is arranged on one side of the sealing plate, and the connecting rod mechanism is connected with a stay wire linkage mechanism through a stay wire;
the control method of the control system comprises the following steps:
(4-1) presetting a forklift engine rotating speed explosion-proof limit value in the controller, receiving a rotating speed signal sent by the explosion-proof generator in real time by the controller, and calculating according to the speed ratio of an engine fan wheel and the explosion-proof generator fan wheel to obtain the rotating speed of the current engine;
(4-2) the controller compares the engine rotating speed obtained by calculation in the step (4-1) with a forklift engine rotating speed explosion-proof limit value preset in the controller, and if the obtained engine rotating speed is lower than the limit value preset in the controller, the controller controls an explosion-proof accelerator motor not to supply power and controls explosion-proof fuel to cut off the normal power supply of an electromagnetic valve, so that an explosion-proof air inlet stop valve is normally opened, an engine oil way normally supplies oil, and the engine normally runs;
(4-3) if the rotating speed of the engine is higher than a preset limit value in the controller, the controller controls the explosion-proof fuel oil to cut off the power supply of the electromagnetic valve, the oil supply of an engine oil way is stopped, meanwhile, the controller supplies power to the explosion-proof throttle motor, the explosion-proof throttle motor starts to work, a stay wire of the explosion-proof throttle motor pulls a connecting rod mechanism of the explosion-proof air inlet stop valve through a stay wire linkage mechanism to forcibly close the explosion-proof air inlet stop valve, and the complete flameout of the engine is ensured.
2. The overspeed protection control system of an explosion-proof forklift engine as recited in claim 1, wherein the sealing plate is provided with a bushing at a middle portion thereof, and the sealing plate is slidably connected to the link mechanism through the bushing.
3. The overspeed protection control system of an explosion-proof forklift engine according to claim 1 or 2, characterized by further comprising a buzzer and an LED warning light, both of which are electrically connected to the controller.
4. The control method of the overspeed protection control system of the explosion-proof forklift engine based on claim 1 is characterized by comprising the following steps:
(4-1) presetting a forklift engine rotating speed explosion-proof limit value in the controller, receiving a rotating speed signal sent by the explosion-proof generator in real time by the controller, and calculating according to the speed ratio of an engine fan wheel and the explosion-proof generator fan wheel to obtain the current rotating speed of the engine;
(4-2) the controller compares the engine rotating speed obtained by calculation in the step (4-1) with a forklift engine rotating speed explosion-proof limit value preset in the controller, and if the obtained engine rotating speed is lower than the limit value preset in the controller, the controller controls an explosion-proof accelerator motor not to supply power and controls explosion-proof fuel to cut off the normal power supply of an electromagnetic valve, so that an explosion-proof air inlet stop valve is normally opened, an engine oil way normally supplies oil, and the engine normally runs;
(4-3) if the rotating speed of the engine is higher than a preset limit value in the controller, the controller controls the explosion-proof fuel oil to cut off the power supply of the electromagnetic valve, the oil supply of an engine oil way is stopped, meanwhile, the controller supplies power to the explosion-proof throttle motor, the explosion-proof throttle motor starts to work, a stay wire of the explosion-proof throttle motor pulls a connecting rod mechanism of the explosion-proof air inlet stop valve through a stay wire linkage mechanism to forcibly close the explosion-proof air inlet stop valve, and the complete flameout of the engine is ensured.
5. The control method according to claim 4, further comprising a buzzer and an LED warning light, both of which are electrically connected with the controller; the method comprises the following steps:
and (4-4) when the controller controls the explosion-proof fuel oil to cut off the power supply of the electromagnetic valve and supplies power to the explosion-proof accelerator motor for T time, the engine still cannot automatically flameout, the controller controls the buzzer to give out alarm sound, the LED warning lamp flickers, and the driver is prompted to need to use the manual flameout stay wire assembly to manually complete flameout of the engine.
6. The control method according to claim 5, wherein the T time has a value ranging from 5 seconds to 10 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810289997.5A CN108661809B (en) | 2018-04-03 | 2018-04-03 | Overspeed protection control system and control method for engine of explosion-proof forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810289997.5A CN108661809B (en) | 2018-04-03 | 2018-04-03 | Overspeed protection control system and control method for engine of explosion-proof forklift |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108661809A CN108661809A (en) | 2018-10-16 |
| CN108661809B true CN108661809B (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810289997.5A Active CN108661809B (en) | 2018-04-03 | 2018-04-03 | Overspeed protection control system and control method for engine of explosion-proof forklift |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111425312A (en) * | 2019-09-26 | 2020-07-17 | 扎鲁特旗扎哈淖尔煤业有限公司 | Engine protection device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB902070A (en) * | 1960-02-25 | 1962-07-25 | Nat Mine Service Co | A safety control system for internal combustion engines |
| CN201864531U (en) * | 2010-11-12 | 2011-06-15 | 长沙湘普防爆车辆有限公司 | Explosion-proof diesel forklift |
| CN202091043U (en) * | 2011-06-09 | 2011-12-28 | 东风汽车股份有限公司 | Manual shut-off valve device for mining explosion-proof diesel engine |
| CN103306826B (en) * | 2013-05-17 | 2016-03-09 | 杭叉集团股份有限公司 | Double control air inlet stop valve |
| CN208153167U (en) * | 2018-04-03 | 2018-11-27 | 杭叉集团股份有限公司 | Explosion proof forklift racing of the engine Protection control system |
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- 2018-04-03 CN CN201810289997.5A patent/CN108661809B/en active Active
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| CN108661809A (en) | 2018-10-16 |
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