CN2097200U - Bow-shaped strain type moment limiter - Google Patents
Bow-shaped strain type moment limiter Download PDFInfo
- Publication number
- CN2097200U CN2097200U CN 91215801 CN91215801U CN2097200U CN 2097200 U CN2097200 U CN 2097200U CN 91215801 CN91215801 CN 91215801 CN 91215801 U CN91215801 U CN 91215801U CN 2097200 U CN2097200 U CN 2097200U
- Authority
- CN
- China
- Prior art keywords
- steel plate
- tower crane
- travel switch
- adjusting screw
- bow
- 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.)
- Withdrawn
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- Control And Safety Of Cranes (AREA)
Abstract
The utility model relates to a bow-shaped strain type moment limiter which belongs to a safety device for the tower crane. While in use, the tipping damage accident which is caused by the overload of the lifting moment of the tower crane can be prevented. The utility model is characterized in that a bow shape steel plate is soldered on the main chord rod of the tower crane, the middle of the steel plate is provided with one to two adjusting screw, a travel switch bracket is arranged at the lower end of the adjusting screw, a travel switch is fixed on the middle of the bracket, and the switch contact of the travel switch is positioned at the front part of the end point of the adjusting screw. When the crane exceeds the rated weight, the end point of the adjusting screw is contacted with the contact of the travel guide switch; so the alarm can be sent out immediately, and the electric source is cut off at the same time; thereby, the safe operation is achieved.
Description
The utility model belongs to building field, is specifically to prevent that various model tower cranes from causing a kind of safety device of the damage accident of tumbling because of the overload of hoisting moment.
Press the limiter of moment of dress at present at various different model tower cranes, computermatic, electronic type and mechanical type are arranged, computer and electronic type limiter of moment intuitive display, precision height, but poor reliability, damage rate height, mainly all operations in the open air of this type of killer, meet daily exposing to wind and rain and cause the damage phenomenon easily, simultaneously electric equipment such as welding generator will cause the interference of computer and electronic type killer on the building site, influence reliability, and the cost height.Another kind of mechanical type is to use lever principle to make, and its shortcoming commonality is poor.Structure is multiple assorted, installs and the maintenance inconvenience.
The purpose of this utility model provides a kind of wide accommodation, simple in structure easy for installation need not any additional requirement and repacking to hoisting crane, field work reliability height is not subjected to a kind of arc strain-type limiter of moment of electric noise of the electric equipment of operating mode.
For finishing the above-mentioned technical scheme that purpose adopted: the utility model is to manufacture and design according to the stress and strain in the certain material ranges of Hooke's law is proportional, arc strain-type limiter of moment is installed in the suitable position of tower crane.
An arc steel plate is set on the tower crane main chord, its two ends are fixedly welded on the tower crane main chord, establish one or two governing screw in the middle of the arc steel plate, the travel switch support is established in this screw lower end, and be welded in the tower crane main chord, this support fixed journey system switch, the contact of travel switch places the place ahead of governing screw.
The utility model embodiment is described in detail in conjunction with the accompanying drawings.
Fig. 1 is the utility model structural representation.
According to shown in Figure 1, an arc steel plate 1 is set on the tower crane main chord 2, its two ends are fixedly welded on tower crane main chord 2, establish one or two governing screw 4 in the middle of the arc steel plate 1, if two governing screw 4 vertically are arranged in the middle of the steel plate 1, also can place the transversely arranged of steel plate 1 centre, above-mentioned governing screw 4 lower ends are established travel switch support 3 and are welded in tower crane main chord 2, one or two travel switch 5 is fixed in these support 3 upper ends, the contact 6 of travel switch 5 places the place ahead of governing screw 4 corresponding mutually, in order to prevent the open-air wind and rain invasion and attack of travel switch, can put case 7 preventions.Above-mentioned governing screw 4 extending or shortenings, thereby the displacement that stress permissible value that adjusting tower crane maximum load is born and arc steel plate 1 produce, this moment, the contact 6 of travel switch was a dead point, and the end points of governing screw 4 is a moving contact, the weight of slinging when tower crane is 90% of rated weight, the strain of arc steel plate 1 makes intermediate regulations screw 4 outwards produce a displacement, screw 4 ends are that moving contact contacts with travel switch contact 6, send warning, travel switch 5 is by lead connecting circuit warning device.When the weight of slinging exceeds rated weight, corresponding another travel switch contact of another governing screw 4 contacts then, causing cutting off the electricity supply stops lifting.
When lifting,, make arc steel plate 1 strengthen strain, so the utility model better performances has guaranteed the loading and unloading of tower crane safety because the vibration of wind-force or equipment makes hoisting crane add the power of an external factor, and the power of this external factor superposes with hanging thing weight.The utility model goes for weight-lifting equipments such as driving equally.
Claims (3)
1, a kind of arc strain-type limiter of moment of forming by support, tower crane main chord, it is characterized in that being provided with on the tower crane main chord 2 an arc steel plate 1, its two ends are fixedly welded on tower crane main chord 2, establish 1～2 governing screw 4 in the middle of the arc steel plate 1, travel switch support 3 is established in these governing screw 4 lower ends, be fixedly welded on tower crane main chord 2, support 3 fixed journey system switches 5, the contact 6 of travel switch 5 places the place ahead of governing screw 4.
2, arc strain-type limiter of moment according to claim 1 is characterized in that arc steel plate 1 middle two governing screw 4, places the vertical of arc steel plate 1.
3, arc strain-type limiter of moment according to claim 1 is characterized in that arc steel plate 1 middle two governing screw 4, places the horizontal of arc steel plate 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91215801 CN2097200U (en) | 1991-08-16 | 1991-08-16 | Bow-shaped strain type moment limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91215801 CN2097200U (en) | 1991-08-16 | 1991-08-16 | Bow-shaped strain type moment limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2097200U true CN2097200U (en) | 1992-02-26 |
Family
ID=4923827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91215801 Withdrawn CN2097200U (en) | 1991-08-16 | 1991-08-16 | Bow-shaped strain type moment limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2097200U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410162C (en) * | 2005-07-04 | 2008-08-13 | 谭英强 | Tower type crane |
| CN102095361A (en) * | 2010-11-18 | 2011-06-15 | 山西省电力公司电力科学研究院 | Automatic monitoring and alarming device based on large strain of power transmission steel tower |
| WO2013033904A1 (en) * | 2011-09-08 | 2013-03-14 | 长沙中联重工科技发展股份有限公司 | Method and device for measuring lifting moment of tower crane and monitoring system |
| CN108128716A (en) * | 2018-02-01 | 2018-06-08 | 徐州建机工程机械有限公司 | A kind of tower crane moment limiter and its safety control system, method |
| CN111332966A (en) * | 2020-02-28 | 2020-06-26 | 徐州建机工程机械有限公司 | Tower crane double-safety control system and method based on moment and weight |
-
1991
- 1991-08-16 CN CN 91215801 patent/CN2097200U/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410162C (en) * | 2005-07-04 | 2008-08-13 | 谭英强 | Tower type crane |
| CN102095361A (en) * | 2010-11-18 | 2011-06-15 | 山西省电力公司电力科学研究院 | Automatic monitoring and alarming device based on large strain of power transmission steel tower |
| WO2013033904A1 (en) * | 2011-09-08 | 2013-03-14 | 长沙中联重工科技发展股份有限公司 | Method and device for measuring lifting moment of tower crane and monitoring system |
| CN108128716A (en) * | 2018-02-01 | 2018-06-08 | 徐州建机工程机械有限公司 | A kind of tower crane moment limiter and its safety control system, method |
| CN108128716B (en) * | 2018-02-01 | 2024-05-28 | 徐州建机工程机械有限公司 | Tower crane moment limiter and safety control system and method thereof |
| CN111332966A (en) * | 2020-02-28 | 2020-06-26 | 徐州建机工程机械有限公司 | Tower crane double-safety control system and method based on moment and weight |
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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 |