CN202116211U - Mechanical limiter for elevating capacity - Google Patents
Mechanical limiter for elevating capacity Download PDFInfo
- Publication number
- CN202116211U CN202116211U CN2011201300556U CN201120130055U CN202116211U CN 202116211 U CN202116211 U CN 202116211U CN 2011201300556 U CN2011201300556 U CN 2011201300556U CN 201120130055 U CN201120130055 U CN 201120130055U CN 202116211 U CN202116211 U CN 202116211U
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- China
- Prior art keywords
- eccentric shaft
- proving ring
- steel pulley
- pivoted arm
- tower
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Abstract
The utility model discloses a mechanical limiter for elevating capacity. The limiter consists of an eccentric shaft 1, a steel pulley 2, a force measuring ring 3, a rotation arm 4 and a shaft hole 5; the steel pulley 2 is fixed on a platform fixing frame under a tower cap of a tower crane by the eccentric shaft 1, the rotation arm 4 is sleeved on the eccentric shaft 1, one end of the force measuring ring 3 is fixed on the rotation arm 4 by a hinge pin 7, and the other end of the force measuring ring 3 is fixed by an earhole. With the adoption of the structure, the resultant force variation of the lifting of the tower crane on the steel pulley can be measured accurately by eccentric force of the eccentric shaft, and a microswitch is led to cut off a relative control loop by the deformation of an arc board, so as to guarantee the safety of the crane. The mechanical limiter is suitable for limiting and protecting the elevating capacity of large tonnage tower cranes.
Description
Technical field
The utility model relates to a kind of mechanical type lifting killer, belongs to elevator machinery security protection technology field.
Background technology
Tower crane is building and the mega project requisite key equipment of constructing, and is one of significant important equipment of construction enterprises' equipment.Load lifting limiter is widely used as a kind of safety precautions of tower crane.Because of lifting overload causes the crane steel structure distortion even occurs that hoisting crane integral body is overturned thereby the serious accident that causes happens occasionally, it is the important assurance that prevents that such incident from taking place that load lifting limiter is installed on elevator machinery, and conventional hoisting capacity is through two proving rings; One end is fixed, and an other end is gone here and there on bearing pin with pulley, fixes with nut-lock washer; The pulley of tower machine is around the steel rope of hoisting heavy; The pulling force that steel rope receives affacts on the pulley, causes proving ring to receive the pulling force distortion; Shell fragment at proving ring deforms thereupon, triggers micro-switch and moves.Protect the tower machine to prevent the order that overloads thereby reach; The load lifting limiter of this structure can be installed and used on the tower machine of little tonnage, but to large-tonnage, as more than 30 tons; Its production and installation is just inconvenient; The volume steel structure of proving ring is proposed very high requirement, and physical construction is subject to ectocine, stability also is affected.
The weight measurement effect of electrometer formula load lifting limiter directly influences the size of gravity, and friction force is arranged in the weight measurement, the silk rope just that goes up and down, and wind etc. are all influential to measuring.And the stability of electrometer formula load lifting limiter, receive very much electronic component, power supply, the influence of electromagnetic interference, the stability of product is had a greatly reduced quality, and the safety guard-safeguard coefficient reduces.There are many problems in therefore existing conventional hoisting capacity product on the safety overload protection.
Summary of the invention
The purpose of the utility model is, overcomes the problems that traditional load lifting limiter is deposited on the safety overload protection, discloses a kind of mechanical type load lifting limiter; It is simple in structure; Work does not receive the influence of external electromagnetic field and power-supply fluctuation, and stable and reliable for performance, manufacturing cost is low.
The technical scheme of the utility model is on the platform fixed mount under the tower cap of tower crane, to hold steel pulley, pivoted arm on excentric sleeve through eccentric shaft; On pivoted arm, pass through fixedly proving ring one end of a bearing pin, an other end of proving ring is fixed with earhole, receives making a concerted effort of steel rope at the steel pulley; Pivoted arm is with the steel pulley rotating; The pulling proving ring causes the proving ring distortion to touch the micro-switch in the ring, realizes the force moment protection to tower crane.
The utility model mechanical type load lifting limiter is by eccentric shaft 1, and steel pulley 2, proving ring 3, pivoted arm 4 and axis hole 5 are formed.On the platform fixed mount under the tower crane tower cap, through eccentric shaft 1, steel pulley 2 puts a pivoted arm 4 at eccentric shaft 1, on pivoted arm 4, passes through fixedly proving ring 3 one ends of bearing pin 7, and an other end of proving ring 3 is fixed with earhole.Steel pulley 2 receives making a concerted effort of steel rope, and force action is on eccentric shaft 1, and eccentric shaft 1 is subjected to displacement after receiving and making a concerted effort, and the pivoted arm 4 that is enclosed within on the eccentric shaft 1 also rotates thereupon, and proving ring receives the pulling force distortion.
The proving ring of the utility model is by shell and end cover rubber 8, cambered plate 9, micro-switch 10, trimming screw 11, form.Two cambered plates 9 about being provided with in the proving ring 3 of the utility model; Be provided with four pairs of micro-switchs (10) and trimming screw (11) on two cambered plates respectively accordingly; Micro-switch (10) is located on the left curved shape plate, and is being provided with trimming screw on the corresponding right cambered plate with it; The structure of proving ring is as shown in Figure 3.
The utility model adopts said structure, is subjected to displacement through the steel pulley is stressed, and eccentric shaft rotates; Drive is enclosed within the pivoted arm on the eccentric shaft, and pivoted arm pulling proving ring is established the relative cambered plate of a pair of arc in proving ring; Captiveing joint with draw ring respectively in the two ends of cambered plate, when the stressed eccentric rotation axis of steel pulley, drives axle sleeve; The distortion of pulling proving ring, cambered plate deforms because of tension, produces an infinitesimal deformation in proving ring earhole direction; The bow template produces the distortion of several times in vertical direction, cuts off the electricity supply thereby make trimming screw touch micro-switch, reaches the purpose of freight weight limit; It is not influenced by external electromagnetic and mains fluctuations.Freight weight limit is highly sensitive, and Installation and Debugging are convenient.
The utility model compared with present technology beneficial effect is; After adopting the utility model structure; Directly measure the lifting of tower machine exactly through the eccentric shaft eccentric force and act on the variable quantity of making a concerted effort on the steel pulley; Through cambered plate distortion causing micro-switch action taking place and cut off corresponding control loop, has ensured the safety of hoisting crane.
The utility model is applicable to that the large-tonnage tower crane plays the limiting protecting of tool hoisting capacity.
Description of drawings
Fig. 1 is the utility model large-tonnage power jacking amount limiter structure front view;
Fig. 2 is the utility model large-tonnage power jacking amount limiter structure lateral plan;
Fig. 3 is the utility model proving ring section-drawing.
Wherein figure number is expressed as: the 1st, and eccentric shaft; The 2nd, the steel pulley; The 3rd, proving ring; The 4th, pivoted arm; The 5th, axis hole; The 6th, eccentric orfice; The 7th, bearing pin; The 8th, end cover rubber; The 9th, cambered plate; The 10th, micro-switch; The 11st, trimming screw.
The specific embodiment
The utility model embodiment is as attaching shown in Fig. 1 and 2, and the support bracket fastened earhole end of the steel pulley on hoisting crane, steel pulley 2 are placed in the middle of two earholes; Eccentric shaft 1 passes two earholes and steel pulley 2 centers; Steel rope overlaps a pivoted arm 4 in steel pulley 2 one sides on steel pulley 2, and loose nut is stubborn to prevent that always pivoted arm 4 from withdrawing from eccentric shaft 1 with ending; Guarantee when pivoted arm 4 is installed that axis hole 5, eccentric orfice 6, bearing pin 7 are straight line, pivoted arm 4 must become 90 degree angles with the steel rope resultant direction.Pin shaft hole on the pivoted arm 4 is connected with bearing pin 7 with the earhole of proving ring 3, and the earhole of an other end of proving ring 3 passes the fixed end that is welded on the tower machine with bearing pin.When proving ring 3 is installed, 4 one-tenth 90 degree of proving ring pulling force 3 directions and pivoted arm angle.After above installation site was confirmed, proving ring 3 other ends were fixed with bearing pin 7, guaranteed that proving ring 3 is the straight line tension state.
Its working process is following: the power reasonable function of steel rope is on steel pulley 2, and steel pulley 2 moves very little distance to level 45 degree angles.Eccentric shaft 1 moves and drives pivoted arm 4 rotations, the proving ring 3 that pulling is fixed with bearing pin 7.In proving ring, establishing the relative cambered plate of a pair of arc, captives joint with draw ring respectively in the two ends of cambered plate, when the stressed eccentric rotation axis of steel pulley; Drive axle sleeve, the distortion of pulling proving ring, cambered plate deforms because of tension; Produce an infinitesimal deformation in proving ring earhole direction; The bow template produces the distortion of several times in vertical direction, cuts off the electricity supply thereby make trimming screw touch micro-switch, reaches the purpose of freight weight limit; It is not influenced by external electromagnetic and mains fluctuations.The present embodiment freight weight limit is highly sensitive, and Installation and Debugging are convenient.
Claims (2)
1. a mechanical type load lifting limiter is characterized in that, said killer is made up of eccentric shaft (1), steel pulley (2), proving ring (3), pivoted arm (4) and axis hole (5); On the platform fixed mount under the tower crane tower cap, through eccentric shaft (1), steel pulley (2) puts a pivoted arm (4) at eccentric shaft (1), goes up at pivoted arm (4) and passes through fixedly proving ring (3) one ends of bearing pin (7), and an other end of proving ring (3) is fixed with earhole.
2. mechanical type load lifting limiter according to claim 1; It is characterized in that; Two cambered plates (9) about being provided with in the proving ring (3); Be provided with four pairs of micro-switchs (10) and trimming screw (11) on two cambered plates respectively accordingly, micro-switch (10) is located on the left curved shape plate, and is being provided with trimming screw on the corresponding right cambered plate with it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201300556U CN202116211U (en) | 2011-04-28 | 2011-04-28 | Mechanical limiter for elevating capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201300556U CN202116211U (en) | 2011-04-28 | 2011-04-28 | Mechanical limiter for elevating capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202116211U true CN202116211U (en) | 2012-01-18 |
Family
ID=45457294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201300556U Expired - Fee Related CN202116211U (en) | 2011-04-28 | 2011-04-28 | Mechanical limiter for elevating capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202116211U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105366573A (en) * | 2015-10-30 | 2016-03-02 | 徐州建机工程机械有限公司 | Arrangement form of load lifting limiter of cantilever tower crane |
-
2011
- 2011-04-28 CN CN2011201300556U patent/CN202116211U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105366573A (en) * | 2015-10-30 | 2016-03-02 | 徐州建机工程机械有限公司 | Arrangement form of load lifting limiter of cantilever tower crane |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120118 Termination date: 20200428 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |