CN103990242A - Fire engine and protection device and system for preventing misoperation of ladder rack of fire engine - Google Patents
Fire engine and protection device and system for preventing misoperation of ladder rack of fire engine Download PDFInfo
- Publication number
- CN103990242A CN103990242A CN201410246648.7A CN201410246648A CN103990242A CN 103990242 A CN103990242 A CN 103990242A CN 201410246648 A CN201410246648 A CN 201410246648A CN 103990242 A CN103990242 A CN 103990242A
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- valve
- relay
- ladder
- hydraulic valve
- fire fighting
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- 239000003921 oil Substances 0.000 claims abstract description 32
- 230000009471 action Effects 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims description 19
- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Landscapes
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Ladders (AREA)
Abstract
The invention discloses a fire fighting truck and a protection device and a system for preventing false operation of a ladder frame of the fire fighting truck. Wherein, the fire engine includes a hydraulic valve for controlling the flow and direction of the pressure oil to control the operation of the ladder frame, a main valve, and an on-off switching valve for controlling the main valve to switch the pressure oil delivery direction, and the protection device includes: the first actuating mechanism is connected with the hydraulic valve for controlling the action of the ladder frame; the second actuating mechanism is connected with the first actuating mechanism; when the hydraulic valve is in fault, the first executing mechanism controls the second executing mechanism to act, so that the on-off switching valve does not work, the hydraulic oil supply of the hydraulic valve is cut off, the misoperation of the ladder frame is avoided, and the potential safety hazard is eliminated.
Description
Technical field
The present invention relates to fire fighting truck field, particularly, relate to a kind of fire fighting truck and prevent protective device and the system of its ladder misoperation.
Background technology
In fire fighting truck, the luffing of ladder (being that ladder raises or reduces) is by hydraulic system, to produce pressure oil to make amplitude oil cylinder stretch out or retract, and amplitude oil cylinder is stretched out or the change of retracted orientation is to change direction by hydraulic valve, and the change of these hydraulic valve directions is to realize by electrical system.
Fig. 1 is the ladder luffing hydraulic schematic diagram of fire fighting truck.Wherein, main oil pump 8 is liquid draw force feed from hydraulic oil container 9, produces pressure oil, and pressure oil produces hydraulic power through the 6 pairs of main valves of reversal valve 5 of getting on or off the bus, main valve 5 can be commutated, pressure oil can, to the discharge pressure oil of getting off, also can, to the discharge pressure oil of getting on the bus, be transported to the pressure oil of getting on the bus and be arrived and get on the bus after center steering 4 as required after main valve 5, the proportioning valve 3 that process is got on the bus again, pressure oil is transported to amplitude oil cylinder, makes amplitude oil cylinder stretch out or retract, thereby realize the luffing of ladder.Wherein, ladder is hinged on the piston rod of amplitude oil cylinder 1, by the luffing that stretches out or retract drive ladder of amplitude oil cylinder 1.Center steering 4 is electric passages that get on and off and carry with hydraulic pressure.Main valve 5 is that the pressure oil of getting on the bus, get off is carried the direction valve of conversion.The switching valve 6 of getting on or off the bus is reversal valves of controlling main valve 5 switching to pressure oil throughput directions, thereby realizes the conversion that pressure oil is got on the bus, got off and carries.During floor push on stepping on console, the state of switching valve 6 in the discharge pressure oil of getting on the bus of getting on or off the bus.
In existing electrical system control method, only considered the realization of normal function, and do not considered the situation of hydraulic valve fault (as stuck in hydraulic valve core) the situation of hydraulic valve fault is not had to safety precautions.And when the phenomenon such as stuck appears in hydraulic valve core, may cause the misoperation of luffing, cause vehicle damage or personnel casualty accidents.
In example prior art as shown in Figure 2 about controlling the part electrical schematic diagram of the proportioning valve of ladder luffing.As shown in Figure 2, with the electric control operation handle S1 on console, carry out control ratio valve 3, thereby change the direction of proportioning valve 3, realize the luffing of ladder.
When stepping on the floor push S2 being installed on console, the switching valve 6 of getting on or off the bus is in the state of getting on the bus.So, when hydraulic system is normally worked, step on floor push S2, the switching valve 6 of getting on or off the bus, just in the state of getting on the bus, is then realized rising or the decline of ladder luffing by operation electric control operation handle S1.
Yet when the spool of proportioning valve 3 is stuck, proportioning valve 3 may rise or decline state in ladder luffing, when primer fluid pressing system, as long as step on floor push S2, no matter whether operate electric control handle S1, ladder all can rise or decline.When this thing happens, the rising of ladder or decline probably break on vehicle or other object, particularly ladder or while having personnel in working bucket, and security incident probably occurs.
Summary of the invention
The object of this invention is to provide a kind of protective device, system and fire fighting truck that prevents the misoperation of fire fighting truck ladder, this device, when the hydraulic valve of controlling ladder breaks down, is avoided ladder misoperation, thereby is eliminated safe hidden trouble.
To achieve these goals, the invention provides a kind of protective device that prevents the misoperation of fire fighting truck ladder, the switching valve of getting on or off the bus that the flow that described fire fighting truck comprises controlled pressure oil and the flow direction are controlled hydraulic valve, the main valve of described ladder action and controlled this main valve switching to pressure oil throughput direction, this protective device comprises: the first executing agency, is connected with the described hydraulic valve of controlling described ladder action; And second executing agency, wherein, when described hydraulic valve fault, the second executing agency action described in described the first actuating mechanism controls so that described in the switching valve of getting on or off the bus do not work, cut off the hydraulic oil supply of described hydraulic valve.
The present invention also provides a kind of protection system that prevents the misoperation of fire fighting truck ladder, and described protection system comprises: at least one hydraulic valve, and the flow of controlled pressure oil and the flow direction are controlled described ladder action; And corresponding to the above-mentioned protective device of each hydraulic valve.
In addition, the present invention also provides a kind of fire fighting truck, and described fire fighting truck comprises above-mentioned protection system.
The present invention, when hydraulic valve fault, moves by the second executing agency described in the first actuating mechanism controls, so that the switching valve of getting on or off the bus do not work, and the hydraulic oil supply of cutting-off liquid pressure valve.Thereby can, when the hydraulic valve of controlling ladder breaks down, avoid ladder misoperation.
Other features and advantages of the present invention partly in detail are described the specific embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with the specific embodiment one below.In the accompanying drawings:
Fig. 1 is the ladder luffing hydraulic schematic diagram of fire fighting truck;
Fig. 2 is about controlling the part electrical schematic diagram of the proportioning valve of ladder luffing in prior art;
Fig. 3 is the protection system that prevents the misoperation of fire fighting truck ladder according to of the present invention; And
Fig. 4 is according to the electrical schematic diagram of the protective device that prevents the misoperation of fire fighting truck ladder of one embodiment of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, the specific embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
Fig. 3 is the protection system that prevents the misoperation of fire fighting truck ladder according to of the present invention.As shown in Figure 3, described protection system can comprise hydraulic valve 3, the action of controlling fire fighting truck ladder for flow and the flow direction of controlled pressure oil; And corresponding to the protective device 100 of hydraulic valve 3.Wherein, according to actual conditions, described protection system can comprise at least one hydraulic valve 3, and hydraulic valve 3 can be proportioning valve, and can comprise luffing proportioning valve, flexible proportioning valve and/or revolution proportioning valve, for controlling the luffing of ladder, flexible and/or revolution.
And Fig. 3 also shows the protective device 100 that prevents the misoperation of fire fighting truck ladder provided by the invention.The switching valve 6 of getting on or off the bus that the flow that fire fighting truck comprises controlled pressure oil and the flow direction are controlled hydraulic valve 3, the main valve of described ladder action and controlled this main valve switching to pressure oil throughput direction, described protective device 100 can comprise the first executing agency 110, is connected with the hydraulic valve 3 of controlling the action of fire fighting truck ladder; And second executing agency 120; Wherein, when hydraulic valve 3 fault, the first executing agency 110 controls 120 actions of the second executing agencies, so that the switching valve 6 of getting on or off the bus do not work, and the hydraulic oil supply of cutting-off liquid pressure valve 3.
Below with reference to Fig. 4, set forth by specific embodiment the present invention, but it should be noted, the present invention is not restricted to this.
Fig. 4 is according to the electrical schematic diagram of the protective device that prevents the misoperation of fire fighting truck ladder of one embodiment of the present invention.In this embodiment, the first executing agency and the second executing agency can be respectively the first relay K 1 and the second relay K 2.The control end of the first relay K 1 is connected with hydraulic valve 3, and its normally-closed contact 12 and 19 is connected to the control end of the second relay K 2, for example, can be connected to by the electric slip ring of center steering the control end of the second relay K 2; And the normally-closed contact 12 of the second relay K 2 is connected with 19 in the loop of the switching valve 6 of getting on or off the bus, for example, is connected at lower vehicle controller and gets on or off the bus between switching valve 6.Wherein the electrical module of proportioning valve 3 has valve core reset measuring ability, and when its spool does not reset, it can produce a kind of electric signal.
As shown in Figure 4, in this control circuit, use 24 volts of current/voltages, can, by the fault detection signal of proportioning valve 3 (spool does not reset), be introduced into the first relay K 1.
When hydraulic system is normally worked, proportioning valve 3 does not detect fault-signal, and now, the output voltage of the output contact 13 of proportioning valve 3 is 0 volt.The voltage difference at the first relay K 1 two ends is 24 volts, and the first relay K 1 is normally worked, and now the normally-closed contact 12 and 19 of the first relay K 1 is in off-state.So, the second relay K 2 is in power failure state, and so, the normally-closed contact 22 and 29 of the second relay K 2 is in conducting state.Now, while stepping on floor push S2, the switching valve 6 of getting on or off the bus can normally be worked, and operation electric control operation handle S1, by upper vehicle controller and lower vehicle controller, can control hydraulic system, thereby realize the luffing of ladder.
When hydraulic work system, the spool of proportioning valve 3 is stuck not to be resetted, and the first relay K 1 detects fault-signal, and now, the output voltage of the output contact 13 of proportioning valve 3 is 24 volts.The voltage difference at the first relay K 1 two ends is 0 volt so, and the first relay K 1 can not be worked in power failure state, and the normally-closed contact 12 of the first relay K 1 and 19, in conducting state, so makes the second relay K 2 obtain electric.Now, the normally-closed contact 22 and 29 that is connected on the second relay K 2 in switching valve 6 of getting on or off the bus disconnects, and so gets on or off the bus switching valve 6 dead electricity and can not work.Because the switching valve 6 of getting on or off the bus can not be worked, main valve 5 can not be in running order, and so pressure oil just can not arrive and get on the bus, even if step on floor push S2 and handle electric control operation handle S1, ladder is impossible luffing also, thereby has played the effect of safeguard protection.
The present invention also provides a kind of fire fighting truck, and this fire fighting truck comprises above-mentioned protection system.
Described above is the protective device of the luffing proportioning valve based on control ladder luffing, it should be understood that above-mentioned electic protection is away from going for equally controlling the flexible flexible proportioning valve of ladder and the rotating revolution proportioning valve of control ladder.Object in succinct, does not repeat them here.
The fault-signal of proportion of utilization valve of the present invention, carrys out the pressure oil circuit of cutting-off liquid pressing system by electrical system, thereby realizes the safeguard protection of ladder action, has then ensured vehicle and personnel's safety.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in the above-mentioned specific embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (7)
1. a protective device that prevents the misoperation of fire fighting truck ladder; the switching valve of getting on or off the bus that the flow that described fire fighting truck comprises controlled pressure oil and the flow direction are controlled hydraulic valve, the main valve of described ladder action and controlled this main valve switching to pressure oil throughput direction; it is characterized in that, this protective device comprises:
The first executing agency, is connected with the described hydraulic valve of controlling described ladder action; And
The second executing agency,
Wherein, when described hydraulic valve fault, the second executing agency action described in described the first actuating mechanism controls so that described in the switching valve of getting on or off the bus do not work, cut off the hydraulic oil supply of described hydraulic valve.
2. protective device according to claim 1, is characterized in that, described first and second executing agency is respectively first and second relay,
The control end of described the first relay is connected with described hydraulic valve, and normally-closed contact is connected to the control end of described the second relay; And
The normally-closed contact of described the second relay be connected to lower vehicle controller and described in get on or off the bus between switching valve,
Wherein when described hydraulic valve fault, the normally-closed contact conducting of described the first relay, the normally-closed contact of controlling described the second relay disconnects so that described in the switching valve of getting on or off the bus do not work.
3. protective device according to claim 2, is characterized in that, the normally-closed contact of described the first relay is connected with the control end of described the second relay by the electric slip ring of the center steering of described fire fighting truck.
4. protective device according to claim 3, is characterized in that, when described hydraulic valve fault, described the first relay two ends are without pressure reduction.
5. according to the protective device described in any one claim in claim 1-4, it is characterized in that, described hydraulic valve is proportioning valve, and comprises luffing proportioning valve, flexible proportioning valve and/or revolution proportioning valve.
6. a protection system that prevents the misoperation of fire fighting truck ladder, is characterized in that, described protection system comprises:
At least one hydraulic valve, the flow of controlled pressure oil and the flow direction are controlled described ladder action; And
Corresponding to the protective device described in any one claim in the claim 1-5 of each hydraulic valve.
7. a fire fighting truck, is characterized in that, described fire fighting truck comprises protection system claimed in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410246648.7A CN103990242B (en) | 2014-06-05 | 2014-06-05 | Fire engine and protection device and system for preventing misoperation of ladder rack of fire engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410246648.7A CN103990242B (en) | 2014-06-05 | 2014-06-05 | Fire engine and protection device and system for preventing misoperation of ladder rack of fire engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103990242A true CN103990242A (en) | 2014-08-20 |
| CN103990242B CN103990242B (en) | 2017-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410246648.7A Active CN103990242B (en) | 2014-06-05 | 2014-06-05 | Fire engine and protection device and system for preventing misoperation of ladder rack of fire engine |
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| Country | Link |
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| CN (1) | CN103990242B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2113792U (en) * | 1992-02-11 | 1992-08-26 | 李耀诚 | Automatic aerial fire and rescue vehicle |
| CN102030293A (en) * | 2010-12-10 | 2011-04-27 | 徐州重型机械有限公司 | Elevated operation vehicle and platform leveling hydraulic system thereof |
| CN102425582A (en) * | 2011-12-27 | 2012-04-25 | 徐州重型机械有限公司 | Hydraulic control valve and getting-off support leg control system of firefighting vehicle with hydraulic control valve |
| CN202560698U (en) * | 2012-05-22 | 2012-11-28 | 中联重科股份有限公司渭南分公司 | Hydraulic system protection equipment, hydraulic system and engineering mechanical equipment |
| CN103276933A (en) * | 2013-06-30 | 2013-09-04 | 梁崇彦 | Rising low voltage protection device of car carrying plate of hydraulic type parking equipment |
-
2014
- 2014-06-05 CN CN201410246648.7A patent/CN103990242B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2113792U (en) * | 1992-02-11 | 1992-08-26 | 李耀诚 | Automatic aerial fire and rescue vehicle |
| CN102030293A (en) * | 2010-12-10 | 2011-04-27 | 徐州重型机械有限公司 | Elevated operation vehicle and platform leveling hydraulic system thereof |
| CN102425582A (en) * | 2011-12-27 | 2012-04-25 | 徐州重型机械有限公司 | Hydraulic control valve and getting-off support leg control system of firefighting vehicle with hydraulic control valve |
| CN202560698U (en) * | 2012-05-22 | 2012-11-28 | 中联重科股份有限公司渭南分公司 | Hydraulic system protection equipment, hydraulic system and engineering mechanical equipment |
| CN103276933A (en) * | 2013-06-30 | 2013-09-04 | 梁崇彦 | Rising low voltage protection device of car carrying plate of hydraulic type parking equipment |
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| Publication number | Publication date |
|---|---|
| CN103990242B (en) | 2017-01-18 |
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| C06 | Publication | ||
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| C10 | Entry into substantive examination | ||
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Address after: 410200 No. 997, Section 2, Tengfei Road, Wangcheng District, Changsha City, Hunan Province Patentee after: Hunan Zoomlion emergency equipment Co.,Ltd. Patentee after: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. Address before: No.997 Jinxing Road, Wangcheng District, Changsha City, Hunan Province Patentee before: Changsha Zhonglian Fire-Fighting Machinery Co.,Ltd. Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address |