CN103552894B - Weighing structure at the bottom of sedan-chair and comprise the elevator of weighing structure at the bottom of this sedan-chair - Google Patents
Weighing structure at the bottom of sedan-chair and comprise the elevator of weighing structure at the bottom of this sedan-chair Download PDFInfo
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- CN103552894B CN103552894B CN201310567705.7A CN201310567705A CN103552894B CN 103552894 B CN103552894 B CN 103552894B CN 201310567705 A CN201310567705 A CN 201310567705A CN 103552894 B CN103552894 B CN 103552894B
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Abstract
The invention discloses weighing structure at the bottom of a kind of sedan-chair and comprise the elevator of weighing structure at the bottom of this sedan-chair, weighing structure at the bottom of sedan-chair includes the first contiguous block, the second contiguous block, head rod, the second connecting rod and induction pieces, first contiguous block is rotatably connected with head rod, second contiguous block and the second connecting rod are rotatably connected, second contiguous block is fixed on head rod, and induction pieces is installed in the second connecting rod.Deform at the bottom of sedan-chair on lift car is under the effect by load, first contiguous block also can ensue deflection, owing to being rotatably connected between the first contiguous block and head rod, it is rotatably connected between second connecting rod and the second contiguous block, cut off the first contiguous block, second contiguous block deflects to head rod, the transmission of the second connecting rod, make head rod, second connecting rod will not flexural deformation, and then make the induction pieces being arranged in the second connecting rod be reduced by deflecting the amount of movement caused with flexural deformation, in this way, lift car deformation of bottom is reduced to minimum level to the verity impact of detection data, improve the verity of data, and then improve lift car riding comfort.
Description
Technical field
The present invention relates to elevators field, particularly relate to weighing structure at the bottom of sedan-chair and comprise weighing structure at the bottom of this sedan-chair
Elevator.
Background technology
Elevator on startup, can declutch suddenly, and the traction sheave converse rotating force of main frame increases suddenly, if can not be right
This process carries out good control, will result in elevator and starts instability, makes lift car produce vibrations,
Reduce the comfortableness taken, to this end, apparatus for controlling elevator needs to calculate the size of required traction, and
Finally realize lift car smooth starting.
Apparatus for controlling elevator, before calculating the size of required traction, needs to carry out data acquisition, data
The accuracy gathered directly determines traction and calculates the most accurately, finally determines taking of lift car easypro
Adaptive, is typically fixed on the sensing chip bottom lift car from being arranged on sensor on sedan-chair underframe by detection
Distance calculates the load-carrying of lift car, thus calculates the size of required traction, owing to lift car carries
During weight, certain deformation can occur, thus the data distortion detected can be caused, finally make calculate to drag
Gravitation size distortion, reduces the comfortableness of elevator ride.
Summary of the invention
It is an object of the invention to provide one to weigh weighing structure at the bottom of sedan-chair more accurately.
Further object is that offer is a kind of and take more comfortable elevator.
In order to realize the purpose of the present invention, adopt the technical scheme that:
Weighing structure at the bottom of a kind of sedan-chair, including the first contiguous block, the second contiguous block, head rod, the second company
Extension bar and induction pieces, the first contiguous block is rotatably connected with head rod, and the second contiguous block and second connects
Bar is rotatably connected, and the second contiguous block is fixed on head rod, and induction pieces is installed in the second connecting rod.
Weighing structure at the bottom of sedan-chair is installed on lift car at the bottom of sedan-chair or weighs on rubber, and lift car lowermost end is sedan-chair underframe,
On sedan-chair underframe, sensor is installed, just can obtain electricity by the spacing change between detection sensor and induction pieces
The load-carrying of ladder car, the first contiguous block is fixed on lift car at the bottom of sedan-chair or weighs on rubber, working as lift car
When deforming at the bottom of sedan-chair under the effect by load, the first contiguous block also can ensue deflection, due to
It is rotatably connected between first contiguous block and head rod, after the first contiguous block deflects, head rod
Can deflect without bending by relative first contiguous block, the second contiguous block be fixed on head rod,
It is rotatably connected between second contiguous block and the second connecting rod, when head rod is sent out in self usable rotational direction
During raw certain deflection, the second contiguous block can and then produce an equal amount of deflection, due to the second connecting rod with
Being rotatably connected between second contiguous block, the second connecting rod can deflect without sending out by relative second contiguous block
Raw bending, so, the deformation at the bottom of upper sedan-chair seldom is delivered on weighing structure induction pieces, and weighing structure can be more
React the decrement of rubber of weighing truly.In this way, by lift car deformation of bottom to detection number
According to verity impact be reduced to minimum level, improve the verity of data, and then improve lift car
The comfortableness taken.Especially, when elevator lift car load skewness, the number that existing elevator measures
According to relatively big with real data deviation, in real process, lift car vibrations can be caused relatively big, take easypro
Adaptive is very poor, when using the structure of the present invention, when elevator lift car load skewness, wherein certain the
One contiguous block deflection angle is slightly larger, and the deflection angle of other several first contiguous blocks is less, and deflection angle is less
The component that is delivered on head rod of several first contiguous blocks less, and then be delivered in the second connecting rod
Component less, when slightly larger that first contiguous block of deflection angle is delivered to head rod, first connects
The amount of deflection of bar can reduce, and is the equal of to have carried out deflection angle correcting for the first time, and head rod transmits
Amount of deflection in the second connecting rod can reduce further, is equivalent to that deflection angle has carried out second time and corrects,
So that data measured is more true, effective, can be by elevator car by weighing structure at the bottom of this articulated sedan-chair
Railway carriage or compartment deformation effect is reduced to the least scope, greatly improves the comfortableness of elevator ride.
Below technical scheme is further illustrated:
Wherein in an embodiment, described head rod quantity is two, the number of described second contiguous block
Amount is two, two head rods wherein one be connected with one of two second contiguous blocks, another root
Head rod is connected with another second contiguous block, and two the second contiguous blocks are connected to the second connecting rod
Two ends.
Wherein in an embodiment, second contiguous block at described second connecting rod two ends, head rod pair
Claim to arrange.It is symmetrical arranged and the second contiguous block stress can be made more to equalize.
Wherein in an embodiment, described second connecting rod two ends are connected to the centre of head rod
Position, described induction pieces is installed on the centre position of the second connecting rod.Second connecting rod is installed on the first connection
The centre position of bar, so that no matter head rod toward which direction deflects, the angle of head rod deflection
Degree is all unlikely to too big, and deflection angle is more uniform, and induction pieces is installed on the centre position of the second connecting rod, nothing
Opinion the second connecting rod toward which direction deflects, and the displacement of induction pieces is the most not too large, improves test accuracy.
Wherein in an embodiment, described first contiguous block matches with having respectively on head rod
The first through hole, described second contiguous block and the second contiguous block have the second through hole respectively that match,
Arranging pin with split pin hole in first through hole, the second through hole respectively, pin with split pin hole two ends have pin-and-hole, coordinate in pin-and-hole
There is split pin.By coordinating of split pin and pin with split pin hole, it is achieved be rotatably connected, this simple in construction, tear open
Dress is convenient.
Wherein in an embodiment, described first contiguous block is movably hinged with head rod, and described second
Contiguous block and the second connecting rod are movably hinged.
Wherein in an embodiment, described induction pieces is L-shaped.L-shaped induction pieces is to enable more preferably
The sensor that allows detect.
The present invention also provides for a kind of elevator, including bottom sedan-chair point, point include at the bottom of sedan-chair bottom sedan-chair, rubber of weighing,
Weighing structure and sedan-chair underframe, rubber of weighing is installed at the bottom of sedan-chair and between sedan-chair underframe, sedan-chair underframe arranges sensing
Device, weighing structure at the bottom of above-mentioned sedan-chair is installed at the bottom of sedan-chair or weighs on rubber, induction pieces and the position of sensor
Corresponding.
By installing weighing structure at the bottom of above-mentioned sedan-chair on elevator car bottom, can reduce and deform detection at the bottom of sedan-chair on car
The impact of data, improves the verity of data, makes traction that control system exports and true required draging
Gravitation is more nearly, and improves the comfortableness of elevator ride.
Wherein in an embodiment, described sensor is eddy current sensor.Eddy current sensor uses extensively,
Cheap, detection data are accurate.
The invention have the advantage that
Weighing structure at the bottom of the sedan-chair of the present invention is installed on elevator car bottom, and lift car lowermost end is sedan-chair underframe, sedan-chair
Sensor is installed on underframe, just can obtain elevator by the spacing change between detection sensor and induction pieces
The load-carrying of car, the first contiguous block is fixed on elevator at the bottom of sedan-chair or weighs on rubber, when being subject at the bottom of sedan-chair on elevator
When deforming under the effect of load, the first contiguous block also can ensue deflection, due to the first contiguous block
And it is rotatably connected between head rod, when, after the first contiguous block deflection, head rod can relative first
Contiguous block deflects without bending, and the second contiguous block is fixed on head rod, and second connects
It is rotatably connected between block and the second connecting rod, when head rod occurs certain in self usable rotational direction
During deflection, the second contiguous block can and then produce an equal amount of deflection, owing to the second connecting rod is connected with second
Being rotatably connected between block, the second connecting rod can deflect without bending by relative second contiguous block,
So, the deformation at the bottom of upper sedan-chair seldom is delivered on weighing structure induction pieces, and weighing structure can be the most anti-
Should weigh the decrement of rubber.In this way, by lift car deformation of bottom to detecting the true of data
Property impact be reduced to minimum level, improve the verity of data, and then relaxing of improve that lift car takes
Adaptive.Especially, when elevator lift car load skewness, the data that existing elevator measures are with true
Data deviation relatively big, in real process, lift car vibrations can be caused relatively big, riding comfort is very poor,
When using the structure of the present invention, when elevator lift car load skewness, wherein certain first contiguous block is inclined
Gyration is slightly larger, and the deflection angle of other several first contiguous blocks is less, deflection angle less several first
The component that contiguous block is delivered on head rod is less, and then the component being delivered in the second connecting rod is less,
When slightly larger that first contiguous block of deflection angle is delivered to head rod, the amount of deflection meeting of head rod
Reducing, be the equal of to have carried out deflection angle correcting for the first time, head rod is delivered to the second connection
Amount of deflection on bar can reduce further, is equivalent to that deflection angle has carried out second time and corrects, so that surveying
Obtain data more true, effective, lift car can be deformed shadow by weighing structure at the bottom of this articulated sedan-chair
Ring and be reduced to the least scope, greatly improve the comfortableness of elevator ride.The elevator of the present invention, passes through
At the bottom of the upper sedan-chair of elevator car bottom part or on rubber of weighing, weighing structure at the bottom of above-mentioned sedan-chair is being installed, car bottom can reduced
Portion's deformation impact on detection data, improves the verity of data, make traction that control system export and
True required traction is more nearly, and improves the comfortableness of elevator ride.
Accompanying drawing explanation
Fig. 1 is the top view of weighing structure at the bottom of sedan-chair of the present invention；
Fig. 2 is No. I partial enlarged drawing in Fig. 1；
Fig. 3 is to divide the schematic diagram when the non-load-bearing of lift car bottom the sedan-chair of elevator of the present invention；
Fig. 4 is to divide the schematic diagram when elevator cage loading bottom the sedan-chair of elevator of the present invention；
Fig. 5 is the schematic diagram of lift car bottom surface load-bearing deformation in elevator of the present invention；
Deformation effect schematic diagram when Fig. 6 is that in elevator of the present invention and existing elevator, lift car bears 1/4 unbalance loading.
Description of reference numerals:
Weighing structure at the bottom of 100. sedan-chairs, 101. first contiguous blocks, 102. second contiguous blocks, 103. head rods,
104. second connecting rods, 105. induction pieces, 106. pin with split pin holes, 107. split pins, on 2011. at the bottom of sedan-chair, 2012.
Weigh rubber, 202. sedan-chair underframe, weighing structure at the bottom of 300. existing non-hinge type sedan-chairs.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the invention are described in detail:
Refering to Fig. 1-6, in an embodiment of the present invention, weighing structure 100 at the bottom of a kind of sedan-chair, including first even
Connect block the 101, second contiguous block 102, head rod the 103, second connecting rod 104 and induction pieces 105,
First contiguous block 101 is rotatably connected with head rod 103, the second contiguous block 102 and the second connecting rod
104 are rotatably connected, and the second contiguous block 102 is fixed on head rod 103, and induction pieces 105 is installed on
In second connecting rod 104.
Weighing structure 100 at the bottom of sedan-chair is installed at the bottom of the upper sedan-chair of lift car 2011 or weighs on rubber 2012, electricity
Ladder car lowermost end is sedan-chair underframe 202, and sedan-chair underframe 202 is provided with sensor, by detection sensor and sense
Answering the change of the spacing between part 105 just can obtain the load-carrying of lift car, the first contiguous block 101 is fixed on electricity
At the bottom of the upper sedan-chair of ladder car 2011 or weigh on rubber 2012, when lift car issues in the effect by load
During the shape that changes, the first contiguous block 101 also can ensue deflection, owing to the first contiguous block 101 and first connects
It is rotatably connected between extension bar 103, when, after the first contiguous block 101 deflection, head rod 103 can be relatively
First contiguous block 101 deflects without bending, and the second contiguous block 102 is fixed on head rod
On 103, it is rotatably connected, when head rod 103 between the second contiguous block 102 and the second connecting rod 104
When self usable rotational direction occurs certain deflection, the second contiguous block 102 can and then produce an equal amount of
Deflection, owing to being rotatably connected between the second connecting rod 104 and the second contiguous block 102, the second connecting rod 104
Can deflect without bending by relative second contiguous block 102, so, the deformation at the bottom of upper sedan-chair be seldom
Being delivered on weighing structure induction pieces, weighing structure can react the decrement of rubber of weighing more realistically.Pass through
This mode, is reduced to minimum level by lift car deformation of bottom to the verity impact of detection data, carries
The high verity of data, and then improve the comfortableness that lift car is taken.Especially, lift car is worked as
During load skewness, the data that existing elevator measures and real data deviation are relatively big, in actual mistake
Cheng Zhong, can cause lift car vibrations relatively big, and riding comfort is very poor, when using the structure of the present invention, when
During elevator lift car load skewness, wherein certain first contiguous block 101 deflection angle is slightly larger, and other are several
The deflection angle of individual first contiguous block 101 is less, and several first contiguous blocks 101 that deflection angle is less transmit
Component on head rod 103 is less, and then the component being delivered in the second connecting rod 104 is less,
When slightly larger that first contiguous block 101 of deflection angle is delivered to head rod 103, head rod 103
Amount of deflection can reduce, be the equal of to have carried out deflection angle correcting for the first time, head rod 103 passes
The amount of deflection being delivered in the second connecting rod 104 can reduce further, is equivalent to deflection angle has been carried out second
Secondary rectification, so that data measured is more true, effective, by weighing structure 100 at the bottom of this articulated sedan-chair
Lift car deformation effect can be reduced to the least scope, greatly improve the comfortableness of elevator ride.
As it is shown in figure 1, head rod 103 quantity is two, the quantity of described second contiguous block 102 is
Two, two head rods 103 wherein one be connected, separately with one of two second contiguous blocks 102
A piece head rod 103 is connected with another second contiguous block 102, and two the second contiguous blocks 102 are respectively
It is connected to the two ends of the second connecting rod 104.Second contiguous block 102, first at the second connecting rod 104 two ends is even
Extension bar 103 is symmetrical arranged.It is symmetrical arranged and the second contiguous block 102 stress can be made more to equalize.
As it is shown in figure 1, the second connecting rod 104 two ends are connected to the centre position of head rod 103,
Described induction pieces 105 is installed on the centre position of the second connecting rod 104, and induction pieces 105 is L-shaped.In L
The induction pieces 105 of shape is to enable preferably to allow sensor detect.Second connecting rod 104 is installed on first
The centre position of connecting rod 103, so that no matter head rod 103 toward which direction deflects, first even
The angle of extension bar 103 deflection is all unlikely to too big, and deflection angle is more uniform, and induction pieces is installed on the second connection
The centre position of bar 104, no matter the second connecting rod 104 toward which direction deflects, the displacement of induction pieces 105
The most not too large, improve test accuracy.
As it is shown in figure 1, in the present embodiment, on the first contiguous block 101 and head rod 103 respectively
Having the first through hole matched, described second contiguous block 102 has on the second contiguous block 104 respectively
The second through hole matched, arranges pin with split pin hole 106, pin with split pin hole 106 respectively in the first through hole, the second through hole
Two ends have pin-and-hole, are combined with split pin 107 in pin-and-hole.By coordinating of split pin 107 and pin with split pin hole 106,
Realization is rotatably connected, this simple in construction, easy accessibility.In other embodiments, it is also possible to be,
One contiguous block 101 is movably hinged with head rod 103, the second contiguous block 102 and the second connecting rod 104
It is movably hinged.
As seen in figures 3-6, the present invention also provides for a kind of elevator, including bottom sedan-chair point, divides and include bottom sedan-chair
At the bottom of sedan-chair 2011, weigh weighing structure 100 at the bottom of rubber 2012, sedan-chair and sedan-chair underframe 202, rubber 2012 of weighing is pacified
Being loaded on sedan-chair underframe 202, sedan-chair underframe 202 arranges sensor, described sensor is eddy current sensor, on
Weighing structure 100 at the bottom of the sedan-chair stated is installed at the bottom of sedan-chair 2011 or weighs on rubber 2012, induction pieces 105 with
The position of eddy current sensor is corresponding.Eddy current sensor uses extensively, cheap, and detection data are accurate.
As shown in Figure 3,4, point include at the bottom of sedan-chair 2011 bottom described sedan-chair, rubber 2012 of weighing, knot of weighing
Structure 100 and sedan-chair underframe 202, weighing structure 100 at the bottom of described sedan-chair is installed at the bottom of sedan-chair 2011 or rubber 2012 of weighing
On, there is certain gap between 2011 at the bottom of weighing structure 100 at the bottom of sedan-chair and upper sedan-chair.
Claim at the bottom of above-mentioned sedan-chair by installing at the bottom of the upper sedan-chair under lift car body 2011 or rubber 2012 of weighing
Weight structure, can reduce the cage bottom deformation impact on detection data, improve the verity of data, make control
The traction of system processed output is more nearly with true required traction, improves the comfortableness of elevator ride.
As shown in Figure 6, recorded by experiment, the load that existing lift car records when bearing 1/4 unbalance loading
Tuple is according to less than normal, and the data using the elevator of weighing structure at the bottom of the sedan-chair of the present invention to record eliminate lift car
The impact of deformation of bottom, consistent with actual value.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area
Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended
Claim is as the criterion.
Claims (6)
1. weighing structure at the bottom of a sedan-chair, it is characterised in that include the first contiguous block, the second contiguous block, first
Connecting rod, the second connecting rod and induction pieces, the first contiguous block is rotatably connected with head rod, and second even
Connecing block and the second connecting rod is rotatably connected, the second contiguous block is fixed on head rod, and induction pieces is installed
In the second connecting rod, described head rod quantity is two, and the quantity of described second contiguous block is two,
Two head rods wherein one be connected with one of two second contiguous blocks, another root head rod
Being connected with another second contiguous block, two the second contiguous blocks are connected to the two ends of the second connecting rod, institute
Stating the second connecting rod two ends and be connected to the centre position of head rod, described induction pieces is installed on second
The centre position of connecting rod.
Weighing structure at the bottom of sedan-chair the most according to claim 1, it is characterised in that described first contiguous block with
The first through hole matched is had respectively, on described second contiguous block and the second connecting rod on head rod
Have the second through hole matched respectively, pin with split pin hole is set in the first through hole, the second through hole respectively, band
Pin two ends, hole have pin-and-hole, are combined with split pin in pin-and-hole.
Weighing structure at the bottom of sedan-chair the most according to claim 1, it is characterised in that described first contiguous block with
Head rod is movably hinged, and described second contiguous block and the second connecting rod are movably hinged.
Weighing structure at the bottom of sedan-chair the most according to claim 1, it is characterised in that described induction pieces is L-shaped.
5. an elevator, including bottom sedan-chair point, point includes at the bottom of sedan-chair bottom sedan-chair, rubber of weighing, weighing structure
With sedan-chair underframe, rubber of weighing is installed at the bottom of sedan-chair and between sedan-chair underframe, sedan-chair underframe arranges sensor, and it is special
Levying and be, weighing structure at the bottom of the sedan-chair as described in any one of claim 1-4 is installed at the bottom of upper sedan-chair or weighs rubber
On, induction pieces is corresponding with the position of sensor.
Elevator the most according to claim 5, it is characterised in that described sensor is eddy current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310567705.7A CN103552894B (en) | 2013-11-14 | 2013-11-14 | Weighing structure at the bottom of sedan-chair and comprise the elevator of weighing structure at the bottom of this sedan-chair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310567705.7A CN103552894B (en) | 2013-11-14 | 2013-11-14 | Weighing structure at the bottom of sedan-chair and comprise the elevator of weighing structure at the bottom of this sedan-chair |
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| Publication Number | Publication Date |
|---|---|
| CN103552894A CN103552894A (en) | 2014-02-05 |
| CN103552894B true CN103552894B (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310567705.7A Active CN103552894B (en) | 2013-11-14 | 2013-11-14 | Weighing structure at the bottom of sedan-chair and comprise the elevator of weighing structure at the bottom of this sedan-chair |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB289035A (en) * | 1927-04-22 | 1929-02-07 | Waygood Otis Ltd | Improvements in elevator car platform |
| CN1427798A (en) * | 2000-05-01 | 2003-07-02 | 因温特奥股份公司 | Load-carrying means for cable operated elevators with integrated load measurement device |
| EP1591399A1 (en) * | 2002-09-19 | 2005-11-02 | Mitsubishi Denki Kabushiki Kaisha | Elevator equipment |
| CN201560022U (en) * | 2009-11-13 | 2010-08-25 | 山西省工程机械厂 | Force measuring ring type overload protecting device for construction elevator |
| CN201801254U (en) * | 2010-09-28 | 2011-04-20 | 四川奥尔铂电梯有限公司 | Elevator system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006168950A (en) * | 2004-12-17 | 2006-06-29 | Mitsubishi Electric Corp | Car floor surface moving device for elevator |
-
2013
- 2013-11-14 CN CN201310567705.7A patent/CN103552894B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB289035A (en) * | 1927-04-22 | 1929-02-07 | Waygood Otis Ltd | Improvements in elevator car platform |
| CN1427798A (en) * | 2000-05-01 | 2003-07-02 | 因温特奥股份公司 | Load-carrying means for cable operated elevators with integrated load measurement device |
| EP1591399A1 (en) * | 2002-09-19 | 2005-11-02 | Mitsubishi Denki Kabushiki Kaisha | Elevator equipment |
| CN201560022U (en) * | 2009-11-13 | 2010-08-25 | 山西省工程机械厂 | Force measuring ring type overload protecting device for construction elevator |
| CN201801254U (en) * | 2010-09-28 | 2011-04-20 | 四川奥尔铂电梯有限公司 | Elevator system |
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| CN103552894A (en) | 2014-02-05 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20140205 Assignee: Hitachi elevator (China) Co., Ltd. Guangzhou factory Assignor: Hitachi Elevator (China) Co., Ltd. Contract record no.: 2016440000268 Denomination of invention: Car platform weighing structure and elevator comprising car platform weighing structure Granted publication date: 20160817 License type: Common License Record date: 20161228 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model |