CN2059153U - High frequency induction attenuator for crane - Google Patents
High frequency induction attenuator for crane Download PDFInfo
- Publication number
- CN2059153U CN2059153U CN 89221479 CN89221479U CN2059153U CN 2059153 U CN2059153 U CN 2059153U CN 89221479 CN89221479 CN 89221479 CN 89221479 U CN89221479 U CN 89221479U CN 2059153 U CN2059153 U CN 2059153U
- Authority
- CN
- China
- Prior art keywords
- utility
- frequency induction
- model
- crane
- frequency
- 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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Abstract
The utility model relates to a device for attenuating the high-frequency induced current of cranes, which is especially suitable for tower cranes. The tower cranes working near the transmitting antenna of a broadcasting station can receive strong high-frequency current generated by electromagnetic waves, and the strong high-frequency current can burn constructors to result in the accident of high-altitude falling down. The device is a hanging tool with a framework structure, and two insulating boards made of high-strength materials form an insulating attenuation region to attenuate the high frequency induced voltage of hanging hooks from more than 4000 V to below 70 V. The mechanical strength of the device can be ensured for the requirement of safety for operation under various weather conditions. The utility model has the advantage of stable performance. The utility model solves technical difficulties by using the simple device.
Description
The utility model is a kind of suspender of the crane high frequency induction current that decays, and is specially adapted to tower crane and uses.
Near the tower crane of the operation emitting antenna of broadcast station, during running following phenomenon can appear: hook and hook hoisting rope charged (even if it is also still like this to cut off working power), they can produce spark when colliding with hard wares such as track or building roof truss reinforcing bars, can be burnt during the hand contact.This is because the tower body sectional area is big, becomes due to the electromagnetic receptor of radio station high-frequency emission.The receiving loop that body of the tower, especially elevator, luffing steel rope form can produce strong high frequency induction current, measures with the high frequency voltage tester, and tower crane hook voltage can be higher than 4 kilovolts.Be a workman's that guarantees to construct safe in operation, avoiding burning because of high frequency produces the high-altitude falling accident, and the attenuate high frequency inducing current just becomes a technical barrier that needs to be resolved hurrily.Once taked the strictness of power frequency ground connection to implement (actual measurement grounding resistance 0.05 Europe mother) by standard, cat head, hook and hook elevator body etc. are done all measures of multi-level ground connection, and all failed of the effect, high-frequency induction still exists.
The purpose of this utility model is to provide a kind of device of the crane high frequency induction current that decays, and the construction workman is operated does not have the sense of burning, to eliminate accident potential.
Attenuating device of the present utility model is one to be the suspender of framed structure, two high strength insulcretes by the appropriate intervals space are formed two opposite side of framework, and two (or more than two) vertically pass near two insulcrete terminations respectively and the adapter shaft bolt that plays the role of fastening is formed the two other limit of framework.During use, former tower crane hook hooks steel cable or the steel loop on the end axle bolt, and other end axle bolt connects an attenuating device suspension hook through steel cable or steel loop, and weight is by back one suspension hook lifting.Because two insulcretes have constituted the insulation decay area, high-frequency induction can obtain effective attenuation, has not had the sensation of fulgerizing when touching decays suspension hook or weight during operation, has realized goal of the invention.
The utility model preferably is with spacer on the axle bolt, horizontally slip to prevent steel cable.The high strength insulcrete can adopt high-strength composite material or the engineering plastics with insulating power.Locking measure is preferably taked in the fastening of axle bolt, as using throttled nut and spring cotter etc.
Good effect of the present utility model be with simple device solves " subduing the high-frequency induction electricity burns to operating personal " this difficult problem, removed because of high-frequency currents to burning of the person cause serious safety misadventure may.
Accompanying drawing is the example structure scheme drawing.
Embodiment: seeing accompanying drawing, is one to be used for the high-frequency induction attenuating device of 60/80 ton of rice tower crane.High strength insulcrete (1) is the phenolic laminate of thickness 50mm, length 480～580mm, width 200mm.Axle bolt (2) totally two, each one up and down, to make by 45 steel, diameter is 50mm, length is 246mm.The width between centers of diaxon keyhole is 280～380mm.Spacer (3) is also made by 45 steel, and length is 100mm.Pin-and-hole (5) diameter on the throttled nut (4) is 6mm.(6) be the tower crane hook, about 4080 volts of high-frequency induction voltage.(7) be the attenuating device suspension hook, high-frequency induction voltage is lower than 70 volts.(8) be the connection wire line hitch of φ 18.5mm.
Above-mentioned suspender reaches 25.2 tons through tensile test, voltage stabilizing 15 minutes, and stable performance meets the predetermined coefficients requirement of using standard safely.Load onto tower crane and use on the spot, all right; Can guarantee to lift by crane the security needs of 5 tons of weights, the high-frequency induction voltage of suspension hook is decayed to below 70 volts (if the width between centers of diaxon keyhole is extended to more than the 400mm from 4080 volts, the length of phenolic laminate also prolongs thereupon, then attenuation amplitude is bigger), do not wear and do not had burning heat sensation when gloves touch hoisting heavy and cage branch steel rope, electroprobe is not rubescent yet, and a site operation responsible official and a line operating personal are satisfied with.Through manipulating under various climatic conditions, shop floor worker reflects this attenuating device stable performance, no abnormal situation.
Claims (2)
1, a kind of crane high-frequency induction attenuating device, it is characterized in that being one to be the suspender of framed structure, two high strength insulcretes by the appropriate intervals space are formed two opposite side of framework, vertically pass near two insulcrete terminations respectively more than two or two and the adapter shaft bolt that plays the role of fastening is formed the two other limit of framework.
2, attenuating device as claimed in claim 1 is characterized in that being with spacer on the bolt, the fastening employing throttled nut and the spring cotter of axle bolt, and the high-strength insulation plate is a phenolic laminate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89221479 CN2059153U (en) | 1989-12-16 | 1989-12-16 | High frequency induction attenuator for crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89221479 CN2059153U (en) | 1989-12-16 | 1989-12-16 | High frequency induction attenuator for crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2059153U true CN2059153U (en) | 1990-07-11 |
Family
ID=4875947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89221479 Withdrawn CN2059153U (en) | 1989-12-16 | 1989-12-16 | High frequency induction attenuator for crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2059153U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103601140A (en) * | 2013-12-04 | 2014-02-26 | 国家电网公司 | Insulation crane capable of carrying person for aloft work |
-
1989
- 1989-12-16 CN CN 89221479 patent/CN2059153U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103601140A (en) * | 2013-12-04 | 2014-02-26 | 国家电网公司 | Insulation crane capable of carrying person for aloft work |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |