CN107416628B - Weighing device for weighing elevator car and counterweight - Google Patents
Weighing device for weighing elevator car and counterweight Download PDFInfo
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- CN107416628B CN107416628B CN201710764711.XA CN201710764711A CN107416628B CN 107416628 B CN107416628 B CN 107416628B CN 201710764711 A CN201710764711 A CN 201710764711A CN 107416628 B CN107416628 B CN 107416628B
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- counterweight
- traction sheave
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
- B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons
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- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention relates to a weighing device for weighing the weight of an elevator car and a counterweight, wherein a traction rope is wound on a traction sheave, the car and the counterweight are respectively connected with two ends of the traction rope, and the weighing device comprises: the rope clamping device is arranged on the traction sheave and is used for clamping and fixing the traction rope wound on the traction sheave; the jacking device is arranged below the car or the counterweight so as to support the car or the counterweight and enable the correspondingly connected hoisting ropes to be loose; and the weighing device is arranged on the jacking device and used for measuring the weight of the car or the counterweight. The rope clamping device fixes the traction sheave and the traction rope relatively and does not slide, the jacking device respectively supports the car or the counterweight, the car or the counterweight is independently pressed on the weighing device, the weight of the car and the counterweight is weighed and used as basic parameters of the elevator, and therefore whether the applicable load of the buffer and the safety tongs is within the parameter range required by the type test certificate is judged.
Description
Technical Field
The invention relates to the field of elevator detection, in particular to a weighing device for weighing an elevator car and a counterweight.
Background
Referring to fig. 1, it is difficult to determine whether the applicable weight of the buffer 5 and the safety gear for each elevator corresponds to the actual car 3 and the counterweight 4, and is within the parameter range covered by the type test certificate.
At present, no random file of the factory of the domestic elevator is basically provided with weight parameters of an unloaded car 3 and a counterweight 4, field factors such as decoration weight adjustment exist in the installation process of the elevator, the self weight parameters of the elevator car and the counterweight are unknown, the type selection of safety parts such as a safety clamp and a buffer 5 is basically judged according to the empirical values of the weights of the unloaded car 3 and the counterweight 4, when the weight allowable lower limit of the safety parts is close to the weights of the unloaded car 3 and the counterweight 4, the judgment of the type selection conformity has an uncertain problem, and no inspection method which can be operated on the inspection field of the elevator to obtain the weights of the unloaded car 3 and the counterweight 4 exists at present.
In addition, the conditions that the weight of the car 3 and the weight of the counterweight 4 are changed, such as decoration of the car 3 and loss of the counterweight 4, of the counterweight 4 and the like, often exist in the using process of the elevator, when the weight change is large, the balance coefficient of the elevator can be seriously influenced, the braking and traction capacity of the elevator is rapidly reduced, great potential safety hazards are left, and adverse effects are brought to the energy consumption of the elevator. At present, a method for confirming the weight variation of the car 3 and the counterweight 4 is lacked, and the method is used as a basis for reporting whether the construction supervision and inspection is required.
In the various balance no-load coefficient detection methods proposed previously, error analysis and accuracy evaluation are mostly carried out by comparing the method with the traditional load-current method, but the load-current method also has errors, and only accurate measurement of the weight of the elevator no-load car 3 and the counterweight 4 can obtain the true value of the balance coefficient, so that scientific evaluation is carried out, but a simple, safe and easy-to-operate weight detection method for the no-load car 3 and the counterweight 4 is still lacked.
At present, the following 5 detection methods for testing the balance coefficient of the elevator without load exist in China: 1. a hoisting rope tension test method; 2. a car and counterweight mass difference weighing method; 3. car side stress application balance method; 4. detection methods proposed by local standards in Hunan; 5. power method. None of these 5 methods is able to accurately acquire the weight of the car 3 and the counterweight 4.
Disclosure of Invention
The invention aims to provide a weighing device for weighing the weight of an elevator car and a counterweight.
The technical scheme adopted by the invention for solving the technical problems is as follows: construct a weighing device who weighs elevator car and counter weight, the towline is around establishing on the traction sheave, car and counter weight are connected respectively the both ends of towline, weighing device includes:
the rope clamping device is arranged on the traction sheave and is used for clamping and fixing the traction rope wound on the traction sheave;
the jacking device is arranged below the car or the counterweight so as to support the car or the counterweight and enable the correspondingly connected hoisting ropes to be loose; and
and the weighing device is arranged on the jacking device and used for measuring the weight of the car or the counterweight.
Preferably, the rope clamping device comprises a supporting mechanism arranged on the traction sheave and a pressing mechanism arranged on the supporting mechanism and adjustable in position in the radial direction of the traction sheave;
the compressing mechanism corresponds to the position of a traction rope on the traction sheave so as to compress the traction rope when moving to the traction sheave.
Preferably, the pressing mechanism includes a pressing block provided on the support mechanism to be position-adjustable in a radial direction of the traction sheave;
the pressing block corresponds to the position of the traction rope on the traction sheave, so that the pressing block can press the traction rope when moving to the traction sheave.
Preferably, the pressing mechanism further comprises a lock rod rotatably arranged on the supporting mechanism, one end of the lock rod is in threaded connection with the pressing block, and the position of the pressing block in the radial direction of the traction sheave is adjusted when the lock rod rotates.
Preferably, the end surface of the traction sheave is provided with a step, the support mechanism comprises a first support seat and a lock hook, the first support seat is arranged on the upper side of the traction sheave, the lock hook comprises a connecting rod and a hook body arranged at one end of the connecting rod, the connecting rod is connected with the first support seat, and the hook body hooks the step of the inner ring of the traction sheave.
Preferably, a fabrication hole is formed in one end face of the traction sheave, the support mechanism includes a first support seat arranged on the upper side of the traction sheave and a second support seat mounted on the end face of the traction sheave and connected to the fabrication hole, the first support seat is fixedly connected to the second support seat, and the pressing mechanism is arranged on the first support seat.
Preferably, the weighing device comprises a pressure sensor for acquiring gravity information of the car or the counterweight, and a pressure display mechanism for displaying the acquired gravity information.
Preferably, the jacking device comprises a jack and a force application mechanism for driving the jack to stretch, and the pressure sensor is arranged at the upper end of the jack.
Preferably, the force application mechanism is arranged separately from the jack and is connected by a quick connector.
Preferably, the jacking device further comprises a support for supporting the jack, and the support is provided with a jack for the jack to be inserted.
The weighing device for weighing the elevator car and the counterweight has the following beneficial effects: the traction sheave and the traction rope are relatively fixed and do not slide by using the rope clamping device, the lift car or the counterweight is respectively supported by using the jacking device, the lift car or the counterweight is independently pressed on the weighing device, the weight of the lift car and the weight of the counterweight are directly and respectively weighed, and the weight of the lift car and the weight of the counterweight can be used as basic parameters of the elevator, so that whether the applicable load of the buffer and the safety tongs is in a parameter range required by a type test certificate is judged; and once the weight of the car or the counterweight changes, the weight is used as a basis for determining whether the elevator should declare reconstruction construction inspection; by weighing the car and the counterweight, the balance coefficient of the elevator can be obtained without load.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a diagrammatic view of a helicopter in an embodiment of the invention measuring the weight of the counterweight;
fig. 2 is a schematic sectional view showing a rope clamping device according to an embodiment of the present invention hooked on a step on a traction sheave;
fig. 3 is a schematic view of the pressing mechanism of the rope clamp of fig. 2 engaged with the traction sheave;
fig. 4 is a schematic view of a partial sectional structure of a rope clamping device according to an embodiment of the present invention when the pressing mechanism is engaged with the traction sheave when the rope clamping device is installed to the fabrication hole of the traction sheave;
fig. 5 is a schematic sectional view of the rope clamp of fig. 4 engaged with a traction sheave;
fig. 6 is a schematic view of the jacking device and the weighing device arranged under the car with 2 buffers;
FIG. 7 is a schematic view of the jacking device and the weighing device disposed directly on the hydraulic buffer;
fig. 8 is a schematic view of the jacking device and the weighing device when erected on the polyurethane bumper.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a hoisting rope 1 of a helicopter is wound around a traction sheave 2, a car 3 and a counterweight 4 are connected to both ends of the hoisting rope 1, respectively, and buffers 5 are provided below both the car 3 and the counterweight 4. As shown in fig. 6, 7 and 8, the weighing device 8 for weighing the weight of the elevator car 3 and the counterweight 4 in a preferred embodiment of the invention comprises a rope gripping device 6, a jacking device 7 and a weighing device 8.
The rope clamping device 6 is arranged on the traction sheave 2 to clamp and fix the traction rope 1 wound on the traction sheave 2; the jacking device 7 is arranged below the car 3 or the counterweight 4 to jack up the car 3 or the counterweight 4 and loosen the corresponding connected hoisting ropes 1; the weighing device 8 is arranged on the jacking device 7 and measures the weight of the car 3 or the counterweight 4.
The traction sheave 2 and the traction rope 1 are relatively fixed and do not slide by using the rope clamping device 6, the lift car 3 or the counterweight 4 is respectively supported by using the jacking device 7, the lift car 3 or the counterweight 4 is independently pressed on the weighing device 8, and the weights of the lift car 3 and the counterweight 4 are directly and respectively weighed.
The weight of the car 3 and the counterweight 4 can be used as basic parameters of the elevator, so that whether the applicable load of the buffer 5 and the safety gear is in the parameter range required by the type test certificate is judged; and once the weight of the car or the counterweight changes, the weight is used as a basis for determining whether the elevator should declare reconstruction construction inspection; by weighing the car and the counterweight, the balance coefficient of the elevator can be obtained without load.
The weight of the car 3 and the counterweight 4 can be used as the basis for determining whether the elevator should declare the reconstruction construction inspection. In the using process of the elevator, if the weight of the counterweight 4 is suspected, or when the weight of the car 3 is caused by decoration, advertisement addition, air conditioning addition and the like, the weight difference between the counterweight 4 and the car 3 and the original counterweight 4 and the original car 3 can be calculated by weighing the weights of the counterweight 4 and the car 3, and the weight difference is used as a basis for determining whether the elevator should be declared for reconstruction construction inspection.
The balance coefficient of the elevator can be determined without load through the weighed weights of the car 3 and the counterweight 4, and the cost of the traditional load balance coefficient testing method is greatly reduced.
By adopting the weighing device 8, the weight of the no-load car 3 and the weight of the counterweight 4 can be simply, conveniently and safely weighed and used as the verification parameter for the type selection of the safety part of the elevator.
The balance coefficient of the elevator is accurately calculated through the measured weights of the car 3 and the counterweight 4, and the calculation formula of the balance coefficient of the elevator is as follows:
in the formula: k-the equilibrium coefficient; w-weight of counterweight 4; p-car 3 dead weight; q-elevator rated load weight.
The formula shows that: the elevator balance coefficient k is the ratio of the difference between the weight W of the counterweight 4 and the self weight G of the car 3 to the rated load weight Q. Therefore, the balance coefficient of the elevator can be calculated as long as the difference between the total weight W of the counterweight 4 and the self weight G of the empty car 3 can be measured.
As shown in fig. 2 and 3, the rope clamp 6 includes a support mechanism 61 provided on the traction sheave 2 and a hold-down mechanism 62 provided on the support mechanism 61 and adjustable in position in the radial direction of the traction sheave 2. The pressing mechanism 62 corresponds to a position of the traction rope 1 on the traction sheave 2 to press the traction rope 1 when moving to the traction sheave 2, and generally, the pressing mechanism 62 corresponds to a position of the traction rope 1 on the traction sheave 2 in an axial direction of the traction sheave 2 to press the traction rope 1 onto the traction sheave 2 from outside the traction rope 1.
When weighing is needed, the pressing mechanism 62 presses the hoisting rope 1, and after weighing is completed, the pressing mechanism 62 is released to allow the hoisting rope 1 to slide relative to the traction sheave 2.
Further, the pressing mechanism 62 includes a pressing piece 621 provided on the supporting mechanism 61 to be adjustable in position in the radial direction of the traction sheave 2, the pressing piece 621 corresponding to the position of the hoist rope 1 on the traction sheave 2 to press the hoist rope 1 when the pressing piece 621 moves toward the traction sheave 2, and normally, the pressing mechanism 62 and the hoist rope 1 on the traction sheave 2 correspond to the position in the axial direction of the traction sheave 2 to press them onto the traction sheave 2 from outside the hoist rope 1. The pressing block 621 is close to the traction sheave 2 to press the traction rope 1, and the pressing block 621 is far from the traction sheave 2 to loosen the traction rope 1.
The pressing mechanism 62 further includes a lock lever 622 rotatably provided on the support mechanism 61, and one end of the lock lever 622 is screw-engaged with the pressing block 621, and the pressing block 621 is moved in the radial direction of the traction sheave 2 when the lock lever 622 rotates.
In other embodiments, the pressing block 621 may also be fixedly connected to the lock rod 622, the lock rod 622 is in threaded engagement with the support mechanism 61, and the lock rod 622 rotates to adjust the position of the pressing block 621 in the radial direction of the traction sheave 2, or the position of the pressing block 621 may also be adjusted by other structures to achieve the compression and release of the traction rope 1.
In some embodiments, the end surface of the traction sheave 2 is provided with a step 21, and the support mechanism 61 can be fixed by using the step 21. The supporting mechanism 61 includes a first supporting seat 611 and a locking hook 612, the first supporting seat 611 is disposed on the upper side of the traction sheave 2, the locking hook 612 includes a connecting rod 6121 and a hook 6122 disposed at one end of the connecting rod 6121, the connecting rod 6121 is connected to the first supporting seat 611, and the hook 6122 hooks the inner step 21 of the traction sheave 2. After the connecting rod 6121 and the first supporting seat 611 are connected and fixed, the hook 6122 hooks the step 21 to ensure that the supporting mechanism 61 is fixed on the traction sheave 2 and also to position the pressing mechanism 62.
The first support 611 may be a housing structure, the pressing block 621 is disposed inside the first support 611, and a side surface of the pressing block 621 is in sliding fit with the first support 611, so that the first support 611 serves to guide the moving direction of the pressing block 621.
In other embodiments, as shown in fig. 4 and 5, for the permanent magnet synchronous machines widely used at present, due to the need of maintenance, one end face of the traction sheave 2 is provided with a fabrication hole 22, and the support mechanism 61 can be installed and fixed by means of the fabrication hole 22. The supporting mechanism 61 includes a first supporting seat 611 disposed on the upper side of the traction sheave 2, and a second supporting seat 613 mounted to the end surface of the traction sheave 2 and connected to the fabrication hole 22, the first supporting seat 611 is fixedly connected to the second supporting seat 613, and the pressing mechanism 62 is disposed on the first supporting seat 611. The second support base 613 is fixedly connected to the traction sheave 2, so as to ensure the positioning of the first support base 611 and the pressing mechanism 62.
As shown in fig. 6, 7 and 8, the weighing device 8 further includes a pressure sensor 81 for acquiring information on the weight of the car 3 or the counterweight 4, and a pressure display mechanism for displaying the acquired information on the weight. The jacking device 7 comprises a jack 71 and a force application mechanism 72 for driving the jack 71 to extend and retract, and a pressure sensor 81 is arranged at the upper end of the jack 71.
When the jack 71 supports the car 3 or the counterweight 4, the pressure sensor 81 can accurately obtain the weight information of the car 3 or the counterweight 4, and calculate the weight difference between the weight information and the original counterweight 4 and the weight information of the car 3, so as to be used as a basis for determining whether the elevator should declare the reconstruction construction inspection; the weight of the car 3 and the counterweight 4 can be used as basic parameters of the elevator, so that whether the applicable load of the buffer and the safety gear is in the parameter range required by the type test certificate is judged; the balance coefficient of the elevator can be determined without load, and the cost of the traditional load balance coefficient testing method is greatly reduced.
Preferably, the force applying mechanism 72 may be a hydraulic pump or the like, and the force applying mechanism 72 is disposed separately from the jack 71 and connected by a quick coupling for easy force application and transportation. Normally, the lifting jack 71 rises by about 10cm, the hoisting rope 1 of the car 3 or the counterweight 4 on the lifted side is completely loosened, and the weight of the car 3 or the counterweight 4 is completely dropped on the pressure sensor 81.
The jacking device 7 further comprises a support 73 supporting the jack 71, the jack 71 usually needs to be connected to the ground with its support 73, and different types of supports 73 are used for different types of buffers 5 and the number of buffers 5. For the convenience of installation and disassembly, the bracket 73 is provided with an insertion hole 731 into which the jack 71 is inserted. The jack 71 is designed to be directly inserted into the insertion hole 731.
As shown in fig. 6, the car 3 of a conventional cargo lift is large and two buffers 5 are arranged below the car, and the jack 71 and the bracket 73 thereof can be placed between the two buffers 5 for measurement. As shown in fig. 7, when the car 3 or the counterweight 4 has only a single hydraulic buffer 5, the jack 71 and its bracket 73 may be placed on the upper portion of the hydraulic buffer 5 and fastened with screws, and then the measurement is performed. As shown in fig. 8, when there is only a single polyurethane buffer 5 below the car 3 or the counterweight 4, the jack 71 can be erected above the polyurethane buffer 5 through the bracket 73, and is spaced from the polyurethane buffer 5 by a certain distance, the screw 732 is connected with the bracket 73 to support the bracket 73, the jack 71 is suspended, the height of the bracket 73 and the verticality of the jack 71 are adjusted through the screw 732, and then the measurement is performed.
It is to be understood that the above-described respective technical features may be used in any combination without limitation.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a weigh weighing device (8) of elevator car (3) and counter weight (4) weight, towline (1) is around establishing on traction sheave (2), car (3) and counter weight (4) are connected respectively the both ends of towline (1), its characterized in that, weighing device (8) include:
a rope clamping device (6) which is arranged on the traction sheave (2) and clamps and fixes the traction rope (1) wound on the traction sheave (2);
the jacking device (7) is arranged below the car (3) or the counterweight (4) to support the car (3) or the counterweight (4) and enable the correspondingly connected hoisting ropes (1) to be loosened; and
and the weighing device (8) is arranged on the jacking device (7) and is used for measuring the weight of the car (3) or the counterweight (4).
2. Weighing device (8) according to claim 1 for weighing the elevator car (3) and the counterweight (4), characterized in that the rope gripping device (6) comprises a support mechanism (61) arranged on the traction sheave (2) and a hold-down mechanism (62) arranged on the support mechanism (61) and position-adjustable in the radial direction of the traction sheave (2);
the pressing mechanism (62) corresponds to the position of the traction rope (1) on the traction sheave (2) so as to press the traction rope (1) when moving to the traction sheave (2).
3. Weighing device (8) weighing the weight of an elevator car (3) and a counterweight (4) according to claim 2, characterised in that the pressing means (62) comprise a pressing block (621) which is arranged on the support means (61) in a position-adjustable manner in the radial direction of the traction sheave (2);
the pressing block (621) corresponds to the position of the traction rope (1) on the traction sheave (2) so as to press the traction rope (1) when the pressing block (621) moves towards the traction sheave (2).
4. Weighing device (8) for weighing the weight of an elevator car (3) and a counterweight (4) according to claim 3, characterised in that the hold-down mechanism (62) further comprises a locking lever (622) rotatably arranged on the support mechanism (61), one end of the locking lever (622) being in screw-fit with the pressure block (621), the position of the pressure block (621) in the radial direction of the traction sheave (2) being adjusted when the locking lever (622) is rotated.
5. Weighing device (8) for weighing the weight of an elevator car (3) and a counterweight (4) according to any one of claims 1 to 4, wherein the end face of the traction sheave (2) is provided with a step (21), the support mechanism (61) comprises a first support seat (611) and a lock hook (612), the first support seat (611) is arranged on the upper side of the traction sheave (2), the lock hook (612) comprises a connecting rod (6121) and a hook body (6122) arranged at one end of the connecting rod (6121), the connecting rod (6121) is connected with the first support seat (611), and the hook body (6122) hooks the step (21) of the inner ring of the traction sheave (2).
6. Weighing device (8) for weighing the weight of an elevator car (3) and a counterweight (4) according to any of claims 1 to 4, characterised in that an end face of the traction sheave (2) is provided with a fabrication hole (22), the supporting means (61) comprises a first supporting seat (611) arranged on the upper side of the traction sheave (2) and a second supporting seat (613) mounted to the end face of the traction sheave (2) and connected to the fabrication hole (22), the first supporting seat (611) is fixedly connected to the second supporting seat (613), and the hold-down means (62) is arranged on the first supporting seat (611).
7. Weighing device (8) according to any of claims 1 to 4 for weighing an elevator car (3) and a counterweight (4), characterized in that the weighing device (8) comprises a pressure sensor (81) for acquiring information on the weight of the car (3) or counterweight (4) and a pressure display means for displaying the acquired information on the weight.
8. Weighing device (8) for weighing the weight of an elevator car (3) and a counterweight (4) according to claim 7, characterised in that the jacking device (7) comprises a jack (71) and a force applying mechanism (72) for driving the jack (71) to extend and retract, and the pressure sensor (81) is arranged at the upper end of the jack (71).
9. Weighing apparatus (8) for weighing the weight of an elevator car (3) and a counterweight (4) according to claim 8, characterised in that the force application means (72) are arranged separately from the jack (71) and are connected by means of quick joints.
10. Weighing device (8) weighing the weight of an elevator car (3) and a counterweight (4) according to claim 8, characterised in that the jacking device (7) further comprises a support (73) supporting the jack (71), the support (73) being provided with a socket (731) into which the jack (71) is inserted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710764711.XA CN107416628B (en) | 2017-08-30 | 2017-08-30 | Weighing device for weighing elevator car and counterweight |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710764711.XA CN107416628B (en) | 2017-08-30 | 2017-08-30 | Weighing device for weighing elevator car and counterweight |
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| CN107416628A CN107416628A (en) | 2017-12-01 |
| CN107416628B true CN107416628B (en) | 2020-04-17 |
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| CN201710764711.XA Active CN107416628B (en) | 2017-08-30 | 2017-08-30 | Weighing device for weighing elevator car and counterweight |
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| CN112551307B (en) * | 2020-09-08 | 2021-08-24 | 郑州轻工业大学 | Single-upright-column elevator safety system and elevator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082530A (en) * | 2007-06-26 | 2007-12-05 | 石成江 | Method for measuring static state weight difference in two sides of elvator balancing coefficient |
| CN102351120A (en) * | 2011-09-29 | 2012-02-15 | 苏州富士电梯有限公司 | Elevator lift car load weighing device |
| JP2012136322A (en) * | 2010-12-27 | 2012-07-19 | Hitachi Ltd | Elevator device |
| JP2014201412A (en) * | 2013-04-05 | 2014-10-27 | 株式会社日立ビルシステム | Automatic diagnostic device for elevator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2687472A1 (en) * | 2012-07-18 | 2014-01-22 | Inventio AG | Lift assembly with safety device |
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2017
- 2017-08-30 CN CN201710764711.XA patent/CN107416628B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082530A (en) * | 2007-06-26 | 2007-12-05 | 石成江 | Method for measuring static state weight difference in two sides of elvator balancing coefficient |
| JP2012136322A (en) * | 2010-12-27 | 2012-07-19 | Hitachi Ltd | Elevator device |
| CN102351120A (en) * | 2011-09-29 | 2012-02-15 | 苏州富士电梯有限公司 | Elevator lift car load weighing device |
| JP2014201412A (en) * | 2013-04-05 | 2014-10-27 | 株式会社日立ビルシステム | Automatic diagnostic device for elevator |
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