CN108016964B - Elevator hoisting rope monitoring device and method - Google Patents
Elevator hoisting rope monitoring device and method Download PDFInfo
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- CN108016964B CN108016964B CN201711273675.3A CN201711273675A CN108016964B CN 108016964 B CN108016964 B CN 108016964B CN 201711273675 A CN201711273675 A CN 201711273675A CN 108016964 B CN108016964 B CN 108016964B
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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Abstract
The invention provides an elevator hoisting rope monitoring device which comprises a first telescopic device, a second telescopic device, a first supporting device, a second supporting device, a base, a guide wheel, an angle meter, a first tension sensor and a second tension sensor, wherein the guide wheel is arranged on the base and can move along the horizontal direction; the guide wheel is arranged below the first supporting device. The elevator hoisting rope monitoring device provided by the invention can change the wrap angle within the test range, can monitor the equivalent friction coefficient f of the hoisting force, and can prevent the occurrence of damage caused by the excessively low equivalent friction coefficient f of the hoisting force, and has the advantages of simple structure and convenience in operation.
Description
Technical Field
The invention relates to an elevator traction rope monitoring device and method, and belongs to the technical field of elevators.
Background
In the existing elevator system, the equivalent friction coefficient of the traction machine and the steel wire rope is measured by using an inlet instrument, and the acceleration of the elevator car is measured by the formula f=ln (m 1 (g+a)/m 2 (g-a))/cb, wherein f is the friction coefficient, m1 elevator car mass, a is the acceleration, m2 is the counterweight mass, g is the gravity acceleration, c is the correction coefficient of the environmental factor, and b is the traction radian. The method belongs to non-contact measurement, the test result is greatly influenced by the outside, and the test instrument is expensive. The method for changing the traction wrap angle of the steel wire rope is to use a hoist to hoist the elevator to loosen the steel wire rope, hoist the elevator to a corresponding position and load the steel wire rope. The average time of day for disassembly and assembly is high in labor cost, and the operation of installers is limited due to the narrow well, so that the error of the measured traction radian b is large. The elevator car moves up and down in a hoistway through the driving of the traction rope, the traction rope of the elevator is detected before the elevator is installed, the equivalent friction coefficient f of the traction rope is calculated, the slipping phenomenon of the elevator car is prevented, the equivalent friction coefficient f=1/b ln (T1/T2), b is the radian of a wrap angle between the traction rope and a traction sheave, T1 is the pulling force of the traction rope connected with the elevator car, and T2 is the pulling force of the traction rope connected with a counterweight frame. There are also mechanisms in the prior art that measure f, but these mechanisms are not capable of arbitrarily changing the wrap angle to make the measurement, and are not capable of accurately measuring T1 and T2.
Disclosure of Invention
Based on the defects, the technical problem to be solved by the invention is to provide the elevator traction rope monitoring device which can change the wrap angle within the test range, monitor the equivalent friction coefficient f of the traction force, prevent the damage caused by the excessively low equivalent friction coefficient f of the traction force, and has the advantages of simple structure and convenience in operation.
In order to solve the technical problems, the invention adopts the following technical scheme:
the elevator traction rope monitoring device comprises a first telescopic device, a second telescopic device, a first supporting device, a second supporting device, a base, a guide wheel, an angle meter, a first tension sensor and a second tension sensor, wherein the guide wheel is arranged on the base and can move along the horizontal direction, the angle meter is used for measuring the wrap angle of a traction rope, the first tension sensor and the second tension sensor are used for respectively measuring the tension of two traction ropes led out from the traction wheel, the first telescopic device and the second telescopic device are oppositely arranged, the first supporting device is hinged with the telescopic end of the first telescopic device, and the second supporting device is hinged with the telescopic end of the second telescopic device; the guide wheel is arranged below the first supporting device.
The first telescopic device and the second telescopic device comprise a transmission device, a gear and a connecting rod, the transmission device is meshed with the gear, one end of the connecting rod is hinged with the gear, and the other end of the connecting rod is hinged with the supporting device.
The connecting rod is a telescopic connecting rod and comprises a first connecting rod, an air pressure deformation mechanism and a second connecting rod which are sequentially connected.
The pneumatic deformation mechanism comprises an air bag and a bracket attached to the air bag.
The transmission device is a rack or a chain, and the rack or the chain is meshed with the gear.
The first telescoping device and the second telescoping device share the same rack or chain.
The first supporting device and the second supporting device comprise a first supporting wheel, a second supporting wheel, a frame, a test wheel and a first synchronous belt, wherein the first supporting wheel, the second supporting wheel, the frame is used for enabling a traction rope to bypass the first supporting wheel and the second supporting wheel in sequence, the test wheel is used for pressing the traction rope, the first synchronous belt is used for driving the second supporting wheel to move, the test wheel is arranged between the first supporting wheel and the second supporting wheel, and the test wheel is a cam with different radiuses.
The test device is characterized by further comprising a synchronous belt for driving the test wheel to move, wherein the test wheel is arranged on the synchronous belt, and the synchronous belt is parallel to a connecting line between the first supporting wheel and the second supporting wheel.
The base is provided with a screw rod, and the guide wheel is provided with a guide seat in threaded connection with the screw rod.
And the hoisting rope is also provided with a telescopic mechanism which is a hydraulic telescopic mechanism.
By adopting the technical scheme, the invention has the following technical effects:
(1) According to the elevator hoisting rope monitoring device provided by the invention, the hoisting rope can bypass the first supporting device, the traction wheel, the second supporting device and the guide wheel, the wrap angle of the hoisting rope can be changed through the movement of the first telescopic device and the guide wheel, the first supporting device is moved to be tightly attached to the hoisting rope through the telescopic of the first telescopic device, the wrap angle is measured through the angle meter arranged on the telescopic device, and the tension T of the hoisting rope is directly measured through a contact method; the equivalent friction coefficient of the hoisting rope is calculated according to the formula f=1/b ln (T1/T2), and the structure is simple and the operation is convenient;
(2) The telescopic connecting rod at the top of the lift car is adjusted to enable the steel wire rope to be in a loosening state, the guide wheel with the base is adjusted to a certain position, and the first telescopic device is adjusted to enable the steel wire rope to be tensioned. Meanwhile, the gear can be driven to rotate through the rotation of the rack, the opening angle of the connecting rod can be driven to change through the rotation of the gear, so that the opening angles of the first supporting device and the second supporting device are also changed, the wrap angles of the hauling ropes bypassing the first supporting device and the second supporting device are also changed, the wrap angle theta of the hauling ropes is measured through the sensor, and the change angle theta is calculated according to the radian formula b=theta/180 degrees x pi;
(3) The tension of the hoisting rope can be accurately measured through the supporting device and the tension sensor, and the hoisting rope is simple in structure and convenient to operate.
The invention further aims to solve the technical problem of providing the elevator traction rope monitoring method, which can change the wrap angle in the test range to test the friction coefficient of equivalent weight of the traction rope under different wrap angles, and has the advantages of convenience in operation and high measurement accuracy.
In order to solve the technical problems, the invention adopts the following technical scheme:
an elevator hoisting rope monitoring method comprises the following steps:
(1) The traction rope sequentially bypasses the guide wheel, the second supporting device, the traction wheel, the first supporting device and the guide wheel, the guide wheel is connected with the lift car, the traction rope bypassing the guide wheel is connected with the counterweight block, the first tension sensor is arranged on the traction rope between the guide wheel and the traction wheel, and the second tension sensor is arranged on the traction rope between the guide wheel and the traction wheel;
(2) The wrap angle is adjusted through the second telescopic device and the guide wheel; the position of the traction rope led out from one end of the traction wheel is adjusted through a rack of the second telescopic device or an air pressure deformation mechanism, and the position of the traction rope led out from the other end of the traction wheel is adjusted through left-right movement of the guide wheel, so that the wrap angle theta is changed;
(3) Moving the first supporting device to be tightly attached to the traction rope through the expansion and contraction of the first expansion device, and measuring the wrap angle through an angle meter arranged on the expansion device;
(4) The test wheel is pressed against the traction rope, so that the traction rope is deformed and bent, T1 is measured through the first tension sensor, and T2 is measured through the second tension sensor.
(5) The coefficient of friction of the equivalent of the drag force is calculated by the formula f=1/b ln (T1/T2).
By adopting the technical scheme, the invention has the following technical effects:
(1) According to the elevator hoisting rope monitoring method, the wrap angle can be changed at will to test the equivalent friction coefficient of the hoisting rope under the condition of different wrap angles, the operation is convenient, the guide wheel is not required to be disassembled and reinstalled, and the accuracy of tension measurement is improved, so that the accuracy of the equivalent friction coefficient is improved.
Drawings
Fig. 1 is a structural view of an elevator hoisting rope monitoring apparatus of the present invention;
fig. 2 is a view showing the state of use of the elevator hoisting rope monitoring apparatus of the present invention (before adjusting the wrap angle);
fig. 3 is a view showing the use state of the elevator hoisting rope monitoring device of the present invention (after adjusting the wrap angle).
Detailed Description
As shown in fig. 1 and 2, the invention provides an elevator hoisting rope monitoring device, which comprises a first telescopic device 1, a second telescopic device 2, a first supporting device 3, a second supporting device 4, a base 14, a guide wheel 7 which is arranged on the base 14 and can move along the horizontal direction, an angle meter for measuring the wrap angle of the hoisting rope, and a first tension sensor and a second tension sensor for respectively measuring the compression force of two hoisting ropes led out from a hoisting wheel 5, wherein the first telescopic device 1 and the second telescopic device 2 are oppositely arranged, the first supporting device 3 is hinged with the telescopic end of the first telescopic device 1, the first telescopic device 1 stretches and contracts to move the first supporting device 3 to be tightly attached with the hoisting rope, and the wrap angle is measured through the angle meter arranged on the first telescopic device 1; the second telescopic device 2 is led out from one end of the traction sheave 5 to the position of the traction rope, and the guide wheel 7 moves left and right to adjust the position led out from the other end of the traction sheave 5 to the position of the traction rope, so that the wrap angle theta is changed; the second supporting device 4 is hinged with the telescopic end of the second telescopic device 2; the guide wheel 7 is arranged below the first support means 3.
The first telescopic device 1 and the second telescopic device 2 comprise a transmission device 11, a gear 12 and a connecting rod 13, wherein the transmission device 11 is a rack or a chain, the transmission device 11 is meshed with the gear 12, one end of the connecting rod 13 is hinged with the gear 12, and the other end of the connecting rod 13 is hinged with the supporting device. The connecting rod 13 is a telescopic connecting rod 13, and comprises a first connecting rod 131, an air pressure deformation mechanism 132 and a second connecting rod 133 which are sequentially connected. The pneumatic deforming mechanism 132 includes a balloon and a bracket attached to the balloon. In this embodiment, the first telescopic device 1 and the second telescopic device 2 share one transmission device 11, the transmission device 11 is a rack, the gear 12 of the first telescopic device 1 and the gear 12 of the second telescopic device 2 are both meshed with the rack, the rack moves to drive the gear 12 meshed with the rack to rotate, and as the gear 12 rotates, the included angle between the connecting rods 13 changes, and the distance between the first supporting device 3 and the second supporting device 4 changes, so the wrap angle of the traction rope 10 also changes; the air pressure deformation mechanism 132 can be larger to adjust the included angle between the first supporting device 3 and the second supporting device 4, when the wrap angle to be adjusted exceeds the limit value of the wrap angle which can be adjusted by the gear 12, the air pressure deformation mechanism 132 can be adopted to further finely adjust, and the measurement accuracy is improved.
The first supporting device 3 and the second supporting device 4 each comprise a first supporting wheel 31, a second supporting wheel 32, a frame 33, a test wheel 34 and a first synchronous belt 35, wherein the first supporting wheel 31 and the second supporting wheel 32 are used for enabling a traction rope to sequentially bypass, the frame 33 is used for connecting the first supporting wheel 31 and the second supporting wheel 32, the test wheel 34 is used for compacting the traction rope, the first synchronous belt 35 is used for driving the second supporting wheel 32 to move, the test wheel 34 is arranged between the first supporting wheel 31 and the second supporting wheel 32, the test wheel 34 is a cam with different radiuses, and in the embodiment, the cam is formed by splicing two semi-cylinders with different radiuses. The telescopic end of the first telescopic device 1 or the second telescopic device 2 is hinged with the frame 33.
The first supporting device 3 and the second supporting device 4 further comprise a second synchronous belt 36 for driving the test wheel 34 to move, the test wheel 34 is arranged on the second synchronous belt 36, and the second synchronous belt 36 is parallel to the connecting line between the first supporting wheel 31 and the second supporting wheel 32. When the second supporting wheel 32 is moved to change the distance between the first supporting wheel 31 and the second supporting wheel 32, the test wheel 34 can be moved to the central position of the connecting line of the first supporting wheel 31 and the second supporting wheel 32 by moving the second synchronous belt 36, so that the measurement accuracy is ensured.
Still be provided with telescopic machanism 15 on haulage rope 10, telescopic machanism is hydraulic telescoping mechanism, and the pneumatic cylinder is connected with car 8, and the flexible end is connected with haulage rope 10, when leading wheel 7 moves rightwards, increases the elongation of rope through telescopic machanism extension, laborsaving and efficient, and need not to rise the car and realize. The guide wheel 7 is driven to horizontally move through a screw rod.
The invention also provides an elevator hoisting rope monitoring method, which comprises the following steps:
(1) The elevator traction rope monitoring device is arranged below a traction wheel 5, a traction rope bypasses a guide wheel 6, a second supporting device 4, the traction wheel 5, a first supporting device 3 and a guide wheel 7 respectively, a cage 8 is connected to the guide wheel 6, the traction rope bypassing the guide wheel 7 is connected with a counterweight 9, a first tension sensor is arranged on the traction rope between the guide wheel 6 and the traction wheel 5, and a second tension sensor is arranged on the traction rope between the guide wheel 7 and the traction wheel 5;
(2) The wrap angle theta is adjusted through the second telescopic device and the guide wheel 7, the position of the traction rope led out from one end of the traction wheel is adjusted through a rack of the second telescopic device or the pneumatic deformation mechanism 132, the position of the traction rope led out from one end of the traction wheel is adjusted through the left-right movement of the guide wheel 7, and the elongation of the rope is adjusted through the telescopic mechanism, so that the wrap angle theta is changed;
(3, moving the first supporting device to be tightly attached to the traction rope through the expansion and contraction of the first expansion device, and measuring the wrap angle through an angle meter arranged on the expansion device;
(4) Compressing the traction rope through the test wheel 34 to deform and bend the traction rope 10, measuring P1 through the first tension sensor, and measuring P2 through the second tension sensor;
specifically, taking the example of measuring the tension T1 of the hoist rope connected to the car, the first tension sensor is first clamped at a determined position of the stationary wire rope, one half cylinder of the test wheel 34 presses the hoist rope, the radius of this cylinder is r1, the displacement of the wire rope is measured as d1, the pressing force is measured as P1 by the first tension sensor, and the distance between the first support wheel 31 and the second support wheel 32 is l1. Then the second supporting wheel 32 is moved to a distance l2 between the first supporting wheel 31 and the second supporting wheel 32 by the first synchronous belt 35, the test wheel 34 is rotated to the other half cylinder to compress the hauling rope, the radius of the cylinder is r2, the displacement of the steel wire rope is measured to be d2, d2=d1+ (r 2-r 1), the compressing force is measured to be P2 by the second tension sensor, and the distance between the first supporting wheel 31 and the second supporting wheel 32 is l2.
In order to accurately measure the tension of the steel wire rope, the test wheel can be used for calibrating displacement signals, and for the same tension sensor, the ratio of the pressing force to the displacement of the steel wire rope is the same as the standard distance l. D1 and d2 are calculated by formulas (1) and (2): the obtained d1 and d2 are substituted into formula (3) to obtain a value of T1, and the tension T2 of the hoisting rope connected to the counterweight is measured by the same method.
P1/d1＝P2/d2 (1)
d2＝d1+(r2-r1) (2)
T1＝P1P2(l1-l2)/4(P2d1-P1d2) (3)
(5) The equivalent friction coefficient of the traction force is calculated by the formula f=1/b ln (T1/T2), b being the radian of the wrap angle between the traction rope and the traction sheave.
The method for measuring the equivalent friction coefficient of the hoisting rope has the advantages of high measurement accuracy, wide range, labor saving and high efficiency, and is realized without lifting the lift car.
Finally, it should be noted that: although the present invention has been described in detail with reference to the embodiments, it should be understood that the invention is not limited to the preferred embodiments, but is capable of modification and equivalents to some of the features described in the foregoing embodiments, but is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. An elevator towline monitoring device which is characterized in that: the traction rope traction device comprises a first telescopic device, a second telescopic device, a first supporting device, a second supporting device, a base, a guide wheel which is arranged on the base and can move along the horizontal direction, an angle meter for measuring the wrap angle of a traction rope, and a first tension sensor and a second tension sensor for respectively measuring the compression force of two traction ropes led out from the traction wheel; the traction rope sequentially winds the guide wheel, the second supporting device, the traction wheel, the first supporting device and the guide wheel; the first telescopic device and the second telescopic device are arranged oppositely, the first telescopic device stretches and stretches to move the first supporting device to be tightly attached to the traction rope, and the wrap angle is measured through an angle meter arranged on the first telescopic device; the second telescopic device is led out from one end of the traction sheave to the position of the traction rope, and the guide wheel moves left and right to adjust the position led out from the other end of the traction sheave to the position of the traction rope, so that the wrap angle theta is changed; the first supporting device is hinged with the telescopic end of the first telescopic device, and the second supporting device is hinged with the telescopic end of the second telescopic device; the guide wheel is arranged below the first supporting device.
2. Elevator hoisting rope monitoring device according to claim 1, characterized in that: the first telescopic device and the second telescopic device comprise a transmission device, a gear and a connecting rod, the transmission device is meshed with the gear, one end of the connecting rod is hinged with the gear, and the other end of the connecting rod is hinged with the supporting device.
3. The elevator hoisting rope monitoring device of claim 2, characterized in that: the connecting rod is a telescopic connecting rod and comprises a first connecting rod, an air pressure deformation mechanism and a second connecting rod which are sequentially connected.
4. The elevator hoisting rope monitoring device of claim 3, characterized in that: the pneumatic deformation mechanism comprises an air bag and a bracket attached to the air bag.
5. The elevator hoisting rope monitoring device of claim 2, characterized in that: the transmission device is a rack or a chain, and the rack or the chain is meshed with the gear.
6. The elevator hoisting rope monitoring device of claim 5, characterized in that: the first telescoping device and the second telescoping device share the same rack or chain.
7. Elevator hoisting rope monitoring device according to claim 1, characterized in that: the first supporting device and the second supporting device comprise a first supporting wheel, a second supporting wheel, a rack, a test wheel and a first synchronous belt, wherein the first supporting wheel and the second supporting wheel are used for enabling a traction rope to sequentially bypass, the rack is used for connecting the first supporting wheel and the second supporting wheel, the test wheel is used for compacting the traction rope and the first synchronous belt is used for driving the second supporting wheel to move, the test wheel is arranged between the first supporting wheel and the second supporting wheel, and the test wheel is a cam with different radiuses; and/or; the test device is characterized by further comprising a synchronous belt for driving the test wheel to move, wherein the test wheel is arranged on the synchronous belt, and the synchronous belt is parallel to a connecting line between the first supporting wheel and the second supporting wheel.
8. Elevator hoisting rope monitoring device according to claim 1, characterized in that: the base is provided with a screw rod, and the guide wheel is provided with a guide seat in threaded connection with the screw rod; and/or; and the hoisting rope is also provided with a telescopic mechanism which is a hydraulic telescopic mechanism.
9. Elevator hoisting rope monitoring method, using an elevator hoisting rope monitoring device according to any one of claims 1-8, characterized in that: the method comprises the following steps:
(1) The traction rope sequentially bypasses the guide wheel, the second supporting device, the traction wheel, the first supporting device and the guide wheel, the guide wheel is connected with the lift car, the traction rope bypassing the guide wheel is connected with the counterweight block, the first tension sensor is arranged on the traction rope between the guide wheel and the traction wheel, and the second tension sensor is arranged on the traction rope between the guide wheel and the traction wheel;
(2) The wrap angle is adjusted through the second telescopic device and the guide wheel; the first telescopic device and the second telescopic device comprise a transmission device, a gear and a connecting rod, the transmission device is meshed with the gear, one end of the connecting rod is hinged with the gear, the other end of the connecting rod is hinged with the supporting device, the transmission device is a rack or a chain, and the rack or the chain is meshed with the gear; the connecting rod is a telescopic connecting rod and comprises a first connecting rod, an air pressure deformation mechanism and a second connecting rod which are sequentially connected; the position of the traction rope led out from one end of the traction wheel is adjusted through a rack of the second telescopic device or an air pressure deformation mechanism, and the position of the traction rope led out from the other end of the traction wheel is adjusted through left-right movement of the guide wheel, so that the wrap angle theta is changed;
(3) Moving the first supporting device to be tightly attached to the traction rope through the expansion and contraction of the first expansion device, and measuring the wrap angle through an angle meter arranged on the expansion device;
(4) The test wheel is pressed against the traction rope to enable the traction rope to deform and bend, P1 is measured through the first tension sensor, and P2 is measured through the second tension sensor;
step (4) comprises the following steps:
(41) Clamping a first tension sensor at a fixed position of a static steel wire rope, wherein the test wheel (34) is a cam with different radiuses, the cam is formed by splicing two semi-cylinders with different radiuses, one semi-cylinder of the test wheel compresses the traction rope, the radius of the cylinder is r1, the displacement of the steel wire rope is measured to be d1, the compression force is measured to be P1 through the first tension sensor, and the distance between the first support wheel (31) and the second support wheel (32) is l1;
(42) The second supporting wheel is moved to a distance l2 between the first supporting wheel and the second supporting wheel, the l2 is not equal to l1, the test wheel is rotated to the other half cylinder to compress the hauling rope, the radius of the cylinder is r2, the displacement of the steel wire rope is measured to be d2, d2=d1+ (r 2-r 1), the compressing force is measured to be P2 through the second tension sensor, and the distance between the first supporting wheel and the second supporting wheel is l2;
(43) D1 and d2 are calculated by formulas (1) and (2): substituting the obtained d1 and d2 into formula (3) to obtain a value of T1, and measuring the tension T2 of a traction rope connected with the counterweight by the same method;
P1/d1＝P2/d2 (1)；
d2＝d1+(r2-r1) (2)；
T1＝P1P2(l1-l2)/4(P2d1-P1d2) (3)；
(5) The coefficient of friction of the equivalent of the traction force is calculated by the formula f=1/b ln (T1/T2), b being the radian of the wrap angle between the traction rope and the traction sheave.
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| CN108750894B (en) * | 2018-08-24 | 2024-04-09 | 湖州巨创电梯部件有限公司 | Device for assisting lifting of elevator car |
| CN113109065A (en) * | 2021-03-15 | 2021-07-13 | 日立电梯电机（广州）有限公司 | Static load test bed and test method |
| CN114538252B (en) * | 2022-01-18 | 2024-02-06 | 广东省特种设备检测研究院（广东省特种设备事故调查中心） | Traction steel wire rope wrap angle continuous adjusting device and adjusting method |
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| CN204405512U (en) * | 2014-12-30 | 2015-06-17 | 天津高盛钢丝绳有限公司 | A kind of elevator traction steel band static friction coefficient testing machine |
| CN104949834A (en) * | 2015-06-11 | 2015-09-30 | 广州广日电梯工业有限公司 | Traction steel belt test method and traction steel belt test device for simulating elevator running |
| JP2017061368A (en) * | 2015-09-25 | 2017-03-30 | 株式会社日立ビルシステム | Rope tension measurement apparatus, elevator device and rope tension measurement method of elevator device |
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