CN201914905U - Logic action conflict safety protection device of pull rod leveling folding arm type overhead working truck - Google Patents
Logic action conflict safety protection device of pull rod leveling folding arm type overhead working truck Download PDFInfo
- Publication number
- CN201914905U CN201914905U CN2010206945878U CN201020694587U CN201914905U CN 201914905 U CN201914905 U CN 201914905U CN 2010206945878 U CN2010206945878 U CN 2010206945878U CN 201020694587 U CN201020694587 U CN 201020694587U CN 201914905 U CN201914905 U CN 201914905U
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- China
- Prior art keywords
- pull rod
- working
- protection device
- logic action
- tension
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- Expired - Fee Related
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- Control And Safety Of Cranes (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The utility model provides a logic action conflict safety protection device of a pull rod leveling folding arm type overhead working truck, which is mainly characterized in that a tension reversing valve is arranged on a balance pull rod between a turntable and a lower arm or between a working hopper and an upper arm and is used for mounting the tension of the balance pull rod; the upper part, i.e. the contact part of the working hopper and a forearm, of the working hopper is provided with a pressure reversing valve, and the pressure reversing valve is used for monitoring the pressure between hopper arms; when a faulty operation happens and the tension of a pull rod system exceeds the set limit or an upper cross beam of the working hopper approaches the forearm, the overhead working truck is reversed by a stroke valve, and an oil controlled valve is in a protection action state, and then a hydraulic system automatically straighten out the logic action of an arm support to release the abnormal tension of the balance pull rod, and thereby, the accidents are effectively prevented from happening and the safety and the reliability of the whole truck are improved. By applying the logic action conflict safety protection device to a three-section folding overhead truck, the conflict of the logic action of the structure can be effectively avoided and the operating safety is improved.
Description
Technical field
The utility model relates to a kind of pull bar leveling folding-jib aerial platform, particularly a kind of pull bar leveling folding-jib aerial platform logical action conflict safety guard.
Background technology
There is very strict logical action requirement in the folding arm-type aerial platform of three joints of tradition pull bar leveling, in the use if not in addition motion limits mechanical accident even human casualty accident will take place.People added methods such as critical warning or control and avoid the maloperation phenomenon to take place in electric system in the past, though can avoid in the course of normal operation.But, when electric system breaks down, still have misoperation when taking emergency operation or using hydraulic operation separately and take place, cause the generation of mechanical accident or human casualty accident.
Summary of the invention
The purpose of this utility model is the deficiency that exists in the above-mentioned technology, and reliable, simple in structure, the cheap aerial platform logical action conflict of a kind of working stability safety guard is provided.
The purpose of this utility model is achieved in that and comprises the return of stroke valve, and three six logical hydraulicchange-over valves is characterized in that, the tension force change-over valve be installed between turntable and the underarm or work bucket and upper arm between balancing pull rod on, be used to monitor balancing pull rod tension force; At the top setting pressure change-over valve of work bucket, promptly work bucket and forearm touching position are used to monitor the pressure between the bucket arm.When faulty operation takes place; when tie system tension force surpasses set limit or work bucket entablatrance near forearm; the stroke valve makes its commutation; hydraulic operated valve is in the protection operating state; then hydraulic efficiency pressure system will be made the jib logical action automatically in order; discharge the improper tension force of balancing pull rod, thereby effectively avoid the generation of accident, improve the safety and the reliability of car load.
Compared with the prior art, its distinguishing feature is simple in structure, and effect is remarkable, and is with low cost, working stability, reliable.Be applied in the conflict that effectively to avoid logical action on the structure on the high empty wagons of three section folding types, improve processing safety.
Description of drawings:
Fig. 1 is a constructional drawing of the present utility model
Fig. 2 is the another kind of constructional drawing of the utility model
The specific embodiment:
Below in conjunction with accompanying drawing present embodiment is described further:
As shown in Figure 1, tension force change-over valve 3 is installed between turntable 4 and the underarm 1 or work bucket 6 and upper arm 7 between balancing pull rod 2 on, be used to monitor balancing pull rod tension force; As shown in Figure 2, at the top setting pressure change-over valve 4 of work bucket 3, promptly work bucket 3 and forearm 5 touching positions are used to monitor the pressure between the bucket arm.When faulty operation takes place; when tie system tension force surpasses set limit or work bucket entablatrance near forearm; the stroke valve makes its commutation; hydraulic operated valve is in the protection operating state; then hydraulic efficiency pressure system will be made the jib logical action automatically in order; discharge the improper tension force of balancing pull rod, thereby effectively avoid the generation of accident, improve the safety and the reliability of car load.
Claims (1)
1. pull bar leveling folding-jib aerial platform logical action conflict safety guard, comprise the return of stroke valve, three six logical hydraulicchange-over valves, it is characterized in that, the tension force change-over valve be installed between turntable and the underarm or work bucket and upper arm between balancing pull rod on, be used to monitor balancing pull rod tension force; At the top setting pressure change-over valve of work bucket, promptly work bucket and forearm touching position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206945878U CN201914905U (en) | 2010-12-31 | 2010-12-31 | Logic action conflict safety protection device of pull rod leveling folding arm type overhead working truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206945878U CN201914905U (en) | 2010-12-31 | 2010-12-31 | Logic action conflict safety protection device of pull rod leveling folding arm type overhead working truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201914905U true CN201914905U (en) | 2011-08-03 |
Family
ID=44414713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206945878U Expired - Fee Related CN201914905U (en) | 2010-12-31 | 2010-12-31 | Logic action conflict safety protection device of pull rod leveling folding arm type overhead working truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201914905U (en) |
-
2010
- 2010-12-31 CN CN2010206945878U patent/CN201914905U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110803 Termination date: 20131231 |