CN2442981Y - Balanced pulley eccentric sensor - Google Patents
Balanced pulley eccentric sensor Download PDFInfo
- Publication number
- CN2442981Y CN2442981Y CN 00248814 CN00248814U CN2442981Y CN 2442981 Y CN2442981 Y CN 2442981Y CN 00248814 CN00248814 CN 00248814 CN 00248814 U CN00248814 U CN 00248814U CN 2442981 Y CN2442981 Y CN 2442981Y
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- CN
- China
- Prior art keywords
- balanced
- tower crane
- line
- eccentric shaft
- eccentric
- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a balanced pulley eccentric sensor, which is the sensor of an electric lifting moment limiter of a tower crane, and an eccentric shaft is connected with the top of the tower crane. The utility model is characterized in that an eccentric part arranged in the middle part of the eccentric shaft is provided with the balanced pulley on which a balanced guy cable is wound, both ends of the balanced guy cable are respectively connected with a draw plate by pin shafts, and the lower end of the draw plate is connected with a draw rod of the tower crane with the pin shafts. One end of the eccentric shaft is fixed with a force transmission lever, wherein, the end part of which is provided with a load sensing element. The utility model has the advantages of simple structure, reasonable structure, high detection precision, safety, easy debugging, convenient maintenance and low cost.
Description
The utility model is a kind of sensing device of electronics load moment limiter of tower crane, belongs to the tower crane technical field.
Because being the variationization with work range, the rated load weight of tower crane changes.Behind the tower crane hoisting heavy, the also corresponding increase of hoisting moment that produces with the increase of weight mobile range.If hoisting moment is excessive, major accident such as can cause that the tumbling of tower crane, folding arm, body of the tower folding fall.For fear of the generation of accident, tower crane should be adorned load moment limiter.Existing load moment limiter has two kinds: mechanical type load moment limiter and electronics load moment limiter.
Mechanical type load moment limiter volume is big, Heavy Weight, poor sensitivity, and precision is low, needs renewal product.The electronics load moment limiter is because complex structure, involve great expense, promote to also have certain difficulty at present in tower crane, reason is that the pull bar or the drag-line of existing jib for tower crane generally formed by two, makes crane arm become the hyperstatic structure of three fulcrums.All there is relation the pulling force of pull bar and the size of lifted load and amplitude position.Make of the detection of existing electronics load moment limiter, need test load size and two sender units in detected amplitude position moment.The signal of transmission also will carry out multiplying through after the processing and amplifying, thereby makes complex structure, the cost height.
The utility model purpose is to overcome the shortcoming in the above-mentioned technology, a kind of compensating pulley centering type sensing device is proposed, its eccentric shaft is connected the tower crane top, eccentric shaft middle part eccentric part is equipped with compensating pulley, be wound with balanced drag-line on the compensating pulley, the two ends of balanced drag-line connect arm-tie by bearing pin respectively, and the arm-tie lower end connects the pull bar of tower crane with bearing pin.At an end of eccentric shaft, fix a force transferring lever.In the force transferring lever end load sensing unit is set, because the utility model makes the elevator boom rack system be converted into statically determimate structure by hyperstatic structure, this moment, the pulling force of pull bar was directly proportional with hoisting moment.Drawbar Pull acts on the eccentric shaft by balanced drag-line and compensating pulley, and produces an eccentric moment, and the size of this eccentric moment also is directly proportional with hoisting moment.Eccentric moment reaches the load sensing unit of end points by force transferring lever, and the sensitive member output signal is sent into the control setup of similar electronic scale.And its load display part is adjusted into corresponding hoisting moment numerical value, just become an electronics load moment limiter.
The utility model is simple and reasonable for structure, the accuracy of detection height, safe and reliable, safeguard debugging easily, reduced cost.
In conjunction with the accompanying drawings, two embodiment are described
Fig. 1 is to use the structural representation of the compensating pulley centering type sensing device of pressure type load transducer.Eccentric shaft 1 is installed in the top of tower crane, compensating pulley 2 is contained in the middle eccentric part of eccentric shaft 1, and eccentric throw is e, and balanced drag-line 3 is walked around compensating pulley, its end connects arm-tie 5 by bearing pin 4 respectively, and arm-tie 5 lower ends are connected the pull bar 6 of tower crane by bearing pin.Drawbar Pull acts on the compensating pulley 2, produces eccentric moment, and eccentric moment acts on the pressure type load transducer 8 of end by force transferring lever 7.Arrow is depicted as turning to of eccentric moment.
Fig. 2 is the compensating pulley centering type load sensing device of three pull bars (or drag-line) crane arm.Top sheave 8 among the figure, connecting panel 9 and lower sheave 10 connect to form sister block by bearing pin, and the 11st, pull-type load transducer, 12 and 13 is connecting elements of pull-type load transducer.
Claims (4)
1. compensating pulley centering type sensing device is connected the top of tower crane by an eccentric shaft.It is characterized in that a compensating pulley being installed in eccentric shaft middle part eccentric part.Be wound with a balanced drag-line on the compensating pulley, the two ends of balanced drag-line connect arm-tie by bearing pin respectively, and the arm-tie lower end is connected with the pull bar of tower crane with bearing pin, at an end of eccentric shaft, fixes a force transferring lever.In the force transferring lever end, load sensing unit is set.
2. according to the described compensating pulley centering type of claim 1 sensing device, it is characterized in that load sensing unit is the pressure type load transducer.
3. according to the described compensating pulley centering type of claim 1 sensing device, it is characterized in that load sensing unit is pull-type load transducer.
4. according to claim 2 or 3 described compensating pulley centering type sensing devices, it is characterized in that being connected with sister block, and this end of balanced drag-line is fixed on the top of tower crane at balanced drag-line one end.Sister block connects top sheave by connecting panel by bearing pin and lower sheave is formed.Lower sheave is wound with down balanced drag-line, and the other end of following balanced drag-line two ends and balanced drag-line links to each other with arm-tie with bearing pin respectively, and the arm-tie lower end is connected with the pull bar of tower crane with bearing pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00248814 CN2442981Y (en) | 2000-10-05 | 2000-10-05 | Balanced pulley eccentric sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00248814 CN2442981Y (en) | 2000-10-05 | 2000-10-05 | Balanced pulley eccentric sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2442981Y true CN2442981Y (en) | 2001-08-15 |
Family
ID=33607380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00248814 Expired - Fee Related CN2442981Y (en) | 2000-10-05 | 2000-10-05 | Balanced pulley eccentric sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2442981Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384241A (en) * | 2011-07-14 | 2012-03-21 | 山起重型机械股份公司 | Fixed pulley device of crane |
-
2000
- 2000-10-05 CN CN 00248814 patent/CN2442981Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384241A (en) * | 2011-07-14 | 2012-03-21 | 山起重型机械股份公司 | Fixed pulley device of crane |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |