CN109765049B - Fatigue life testing device for main driving chain of escalator - Google Patents
Fatigue life testing device for main driving chain of escalator Download PDFInfo
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- CN109765049B CN109765049B CN201910074086.5A CN201910074086A CN109765049B CN 109765049 B CN109765049 B CN 109765049B CN 201910074086 A CN201910074086 A CN 201910074086A CN 109765049 B CN109765049 B CN 109765049B
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- 238000012360 testing method Methods 0.000 title claims abstract description 53
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000005461 lubrication Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 8
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 230000001050 lubricating effect Effects 0.000 claims 1
- 238000009661 fatigue test Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Escalators And Moving Walkways (AREA)
Abstract
The invention relates to a fatigue life testing device for a main driving chain of an escalator, which is characterized in that a driving rotating shaft and a driven rotating shaft are rotatably arranged, a first driving step, a driving wheel and a second driving step are sequentially fixed on the driving rotating shaft, a first driven step, a driven wheel and a second driven step are sequentially fixed on the driven rotating shaft, the first driving step and the first driven step are connected through a first step chain, the second driving step and the second driven step are connected through a second step chain, the driving wheel is connected with a driving motor through a driving chain, the driven wheel is connected with a load motor through a test driving chain, the test driving chain is opposite to the first step chain in steering, the first step chain and the second step chain detect chain elongation and breakage through a chain elongation breakage detection mechanism, and the driving motor, the load motor and the chain elongation breakage detection mechanism are connected to a control device. The invention can detect the fatigue life of the main drive chain of the escalator under different loads, and is safe and reliable in operation.
Description
Technical Field
The invention belongs to the technical field of fatigue detection of escalator drive chains, and particularly relates to a fatigue life test device for a main drive chain of an escalator.
Background
In recent years, a plurality of public places are subjected to backward sliding accidents caused by the breakage of a main driving chain, so that a plurality of passengers are injured. The main drive chain is the most critical part of the escalator in the power transmission process, once the main drive chain breaks, the connection among a driving device, a brake and the steps is lost, the steps are in a runaway running state, and the escalator can slide down under the action of a load.
The current national standard does not provide technical requirements for the fatigue life of the main drive chain, and escalator manufacturing enterprises generally adopt infinite fatigue designs. Aiming at the potential safety hazards and technical problems exposed by chain breakage accidents of a plurality of escalator, it is necessary to develop fatigue life test researches on a main driving chain of a large-capacity in-service escalator in public places.
Disclosure of Invention
The invention aims to solve the technical problem of providing the fatigue life testing device for the main drive chain of the escalator, which can detect the fatigue life of the main drive chain of the escalator under different loads and is safe and reliable to operate.
The invention provides a fatigue life testing device for a main drive chain of an escalator, which comprises a truss, a drive motor, a drive rotating shaft, a transmission chain, a transmission wheel, a first drive step, a second drive step, a driven rotating shaft, a driven wheel, a test drive chain, a first driven step, a second driven step, a first step chain, a second step chain, a load motor, a chain elongation break detection mechanism and a control device, wherein the drive rotating shaft and the driven rotating shaft are rotatably arranged on the truss, the first drive step, the transmission wheel and the second drive step are sequentially fixed on the drive rotating shaft, the first drive step, the driven wheel and the second driven step are sequentially fixed on the driven rotating shaft, the first drive step and the first driven step are connected through the first step chain, the second drive step and the second driven step are connected through the second step chain, the transmission wheel is connected with the drive motor through the test drive chain, the driven wheel and the load motor are connected through the test drive chain, the test drive chain is opposite to the rotation direction of the first step chain, and the first step chain elongation break detection mechanism and the elongation break detection mechanism are controlled through the first chain and the elongation break detection mechanism.
The driving rotating shaft and the driven rotating shaft are respectively arranged on the truss through the sliding connecting blocks and can slide along the length direction of the first step chain, the two ends of the driving rotating shaft and the driven rotating shaft are respectively connected with the sliding connecting blocks in a shaft mode, the chain elongation breakage detection mechanism comprises a pressing plate, a spring and a pressure sensor, one end of the spring is pressed against the sliding connecting blocks through the pressing plate, and the pressure sensor is arranged at the other end of the spring and detects the tension pressure of the spring.
The chain elongation fracture detection mechanism is arranged in four and corresponds to the sliding connecting blocks at two ends of the driving rotating shaft and the driven rotating shaft.
The driving wheel is positioned in the middle of the driving rotating shaft, and the first driving step and the second driving step are respectively positioned at two sides of the driving wheel.
The driven wheel is positioned at the middle position of the driven rotating shaft, and the first driven step and the second driven step are respectively positioned at two sides of the driven wheel.
The driving rotating shaft and the driven rotating shaft horizontally correspond.
The test driving chain is an escalator double-row main driving chain or a three-row main driving chain.
Advantageous effects
Firstly, the fatigue life of the main drive chain of the escalator under three working conditions of normal lubrication, no lubrication and cyclic load can be detected, the load on the main drive chain can be converted for loading according to the operation parameters of the simulated escalator, and the load size can be adjusted according to the requirement.
Secondly, once the test device has faults such as chain elongation or breakage, the control system can automatically stop the operation of the test device, and the operation is safe and reliable.
Drawings
Fig. 1 is a schematic diagram of the front structure of the present invention.
Fig. 2 is a schematic top view of the present invention.
Fig. 3 is a schematic structural diagram of an active spindle according to the present invention.
Fig. 4 is a schematic structural view of the driven shaft of the present invention.
FIG. 5 is a plot of elongation of the main drive chain over time for three conditions of normal lubrication, no lubrication, and cyclic loading.
Detailed Description
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
The fatigue life testing device for the main driving chain of the escalator shown in fig. 1-4 comprises a truss 1, a driving motor 2, a driving rotating shaft 3, a driving chain 4, a driving wheel 5, a first driving step 6, a second driving step 7, a driven rotating shaft 8, a driven wheel 9, a test driving chain 10, a first driven step 11, a second driven step 12, a first step chain 13, a second step chain 14, a load motor 15, a chain elongation fracture detection mechanism 16 and a control device.
The driving rotating shaft 3 and the driven rotating shaft 8 are rotatably installed on the truss 1 and horizontally correspond to each other. The first driving step 6, the driving wheel 5 and the second driving step 7 are sequentially fixed on the driving rotating shaft 3, the driving wheel 5 is positioned at the middle position of the driving rotating shaft 3, and the first driving step 6 and the second driving step 7 are respectively positioned at two sides of the driving wheel 5. The first driven step 11, the driven wheel 9 and the second driven step 12 are sequentially fixed on the driven rotating shaft 8, the driven wheel 9 is positioned at the middle position of the driven rotating shaft 8, and the first driven step 11 and the second driven step 12 are respectively positioned at two sides of the driven wheel 9. The first driving step 6 and the first driven step 11 are connected through a first step chain 13, and the second driving step 7 and the second driven step 12 are connected through a second step chain 14. The driving wheel 5 is connected with the driving motor 2 through a driving chain 4, the driven wheel 9 is connected with the load motor 15 through a test driving chain 10, and the test driving chain 10 is an escalator double-row main driving chain or a three-row main driving chain. The rotation direction of the test drive chain 10 is opposite to that of the first step chain 13, and the load of the test drive chain 10 can be adjusted by controlling the rotation of the load motor 15, so that the fatigue life of the main drive chain of the escalator under different loads can be detected. The driving motor 2 and the load motor 15 are connected to a control device, the load motor 15 can be controlled by the control device to adjust the load, and the driving motor 2 can be subjected to feedback closed-loop control by the control device to adjust the rotation speed.
The first step chain 13 and the second step chain 14 detect chain elongation and breakage failure by the chain elongation breakage detection mechanism 16. The two ends of the driving rotating shaft 3 and the driven rotating shaft 8 are respectively arranged on the truss 1 through the sliding connecting blocks 20 and can slide along the length direction of the first step chain 13, and the two ends of the driving rotating shaft 3 and the driven rotating shaft 8 are respectively connected with the sliding connecting blocks 20 in a shaft mode. The chain elongation breakage detection mechanism 16 comprises a pressing plate 19, a spring 18 and a pressure sensor 17, one end of the spring 18 is pressed against the sliding connecting block 20 through the pressing plate 19, and the pressure sensor 17 is arranged at the other end of the spring 18 and used for detecting the tensioning pressure of the spring 18. The chain elongation break detection mechanism 16 is provided in four and is provided corresponding to the slide connection blocks 20 at both ends of the driving rotation shaft 3 and the driven rotation shaft 8. The chain elongation breakage detection mechanism 16 is connected to the control device, when the chain is stretched or broken in operation, the driving rotating shaft 3 or the driven rotating shaft 8 can slide, the tension pressure of the spring 18 of the chain elongation breakage detection mechanism 16 is reduced, the pressure sensor 17 detects signals and transmits the signals to the control device, and the control device controls the driving motor 2 and the load motor 15 to stop running, so that the test device automatically stops running, and the test device is safe and reliable.
The test device can test the fatigue life of the main driving chain of two types of double-row chains or three-row chains under three working conditions of normal lubrication, no lubrication and cyclic load. The test device can simulate the escalator, the lifting height of the escalator is 20m at most, the step width is 1000mm, and the maximum running speed is 0.5m/s. According to the operation parameters of the simulated escalator, the load on the main driving chain can be converted for loading, and the loading size can be adjusted according to the requirement. The control system can record the running time of the main driving chain, and once the test device has faults such as chain elongation or breakage, the control system can automatically stop the test device.
The test device has the following test contents under three working conditions of normal lubrication, no lubrication and cyclic load:
1. normal lubrication condition
Test purpose: basic data are obtained and compared with test data of non-lubrication working conditions and cyclic load working conditions.
The fatigue test device simulates full-load operation of the escalator, the main drive chain is automatically lubricated for 5min every 12h, and the test duration is more than 1500 h. And disassembling the main driving chain at intervals, measuring four parameters of the elongation of the main driving chain, the elongation of the inner chain plate, the elongation of the outer chain plate and the diameter of the pin shaft on a special fixture, recording the four parameters, and drawing a curve, as shown in figure 5.
2. Without lubrication condition
Test purpose: lubrication affects the fatigue life of the main drive train.
The fatigue test platform simulates full-load operation of the escalator, a main test driving chain is not lubricated in the operation process, and the test duration is more than 1500 hours. And disassembling the main driving chain at intervals, measuring four parameters of the elongation of the main driving chain, the elongation of the inner chain plate, the elongation of the outer chain plate and the diameter of the pin shaft on a special fixture, recording the four parameters, and drawing a curve, as shown in figure 5.
3. Cycle load condition
Test purpose: load properties affect the main drive train fatigue life.
The fatigue test platform simulates the escalator to run according to the full load of 1.5min and the no-load 2.5min circulating load, the main driving chain is automatically lubricated for 5min every 12h, and the test duration is more than 1500h and is realized by a control system. And disassembling the main driving chain at intervals, measuring four parameters of the elongation of the main driving chain, the elongation of the inner chain plate, the elongation of the outer chain plate and the diameter of the pin shaft on a special fixture, recording the four parameters, and drawing a curve, as shown in figure 5.
Claims (5)
1. An escalator main drive chain fatigue life test device which is characterized in that: comprises a truss (1), a driving motor (2), a driving rotating shaft (3), a transmission chain (4), a transmission wheel (5), a first driving step (6), a second driving step (7), a driven rotating shaft (8), a driven wheel (9), a test driving chain (10), a first driven step (11), a second driven step (12), a first step chain (13), a second step chain (14), a load motor (15), a chain elongation breakage detection mechanism (16) and a control device, wherein the driving rotating shaft (3) and the driven rotating shaft (8) are rotatably arranged on the truss (1), the first driving step (6), the transmission wheel (5) and the second driving step (7) are sequentially fixed on the driving rotating shaft (3), the first driven step (11), the driven wheel (9) and the second driven step (12) are sequentially fixed on the driven rotating shaft (8), the first driving step (6) and the first driven step (11) are connected through the first step chain (13), the second driving step (7) and the second driven step (12) are connected through the second step chain (14) and the driving step (2) through the second step chain (14), the driven wheel (9) is connected with the load motor (15) through a test driving chain (10), the rotation direction of the test driving chain (10) is opposite to that of the first step chain (13), the first step chain (13) and the second step chain (14) detect chain elongation and fracture through a chain elongation fracture detection mechanism (16), the driving motor (2), the load motor (15) and the chain elongation fracture detection mechanism (16) are connected to and controlled by a control device,
The driving rotating shaft (3) and the driven rotating shaft (8) are respectively arranged on the truss (1) through sliding connecting blocks (20) and can slide along the length direction of the first step chain (13), the two ends of the driving rotating shaft (3) and the driven rotating shaft (8) are respectively connected with the sliding connecting blocks (20) in a shaft mode, the chain elongation breakage detection mechanism (16) comprises a pressing plate (19), a spring (18) and a pressure sensor (17), one end of the spring (18) is pressed against the sliding connecting blocks (20) through the pressing plate (19), the pressure sensor (17) is arranged at the other end of the spring (18) to detect the tension pressure of the spring (18), and the test device can perform fatigue life tests of three working conditions of normal lubrication, no lubrication and cyclic load,
The test driving chain (10) is lubricated for 5min every 12h under the normal lubrication working condition;
The test driving chain (10) is not lubricated under the non-lubrication working condition;
the control device is used for controlling the load motor (15) to run according to the full load of 1.5min and the no-load of 2.5min under the circulating load working condition, simultaneously lubricating the test driving chain (10) for 5min every 12h,
The driving rotating shaft (3) and the driven rotating shaft (8) are horizontally corresponding.
2. The escalator main drive chain fatigue life testing device according to claim 1, wherein: the chain elongation fracture detection mechanisms (16) are four and are arranged corresponding to the sliding connecting blocks (20) at two ends of the driving rotating shaft (3) and the driven rotating shaft (8).
3. The escalator main drive chain fatigue life testing device according to claim 1, wherein: the driving wheel (5) is positioned in the middle of the driving rotating shaft (3), and the first driving step (6) and the second driving step (7) are respectively positioned at two sides of the driving wheel (5).
4. The escalator main drive chain fatigue life testing device according to claim 1, wherein: the driven wheel (9) is positioned in the middle of the driven rotating shaft (8), and the first driven step (11) and the second driven step (12) are respectively positioned at two sides of the driven wheel (9).
5. The escalator main drive chain fatigue life testing device according to claim 1, wherein: the test driving chain (10) is an escalator double-row main driving chain or a three-row main driving chain.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910074086.5A CN109765049B (en) | 2019-01-25 | 2019-01-25 | Fatigue life testing device for main driving chain of escalator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910074086.5A CN109765049B (en) | 2019-01-25 | 2019-01-25 | Fatigue life testing device for main driving chain of escalator |
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| CN109765049A CN109765049A (en) | 2019-05-17 |
| CN109765049B true CN109765049B (en) | 2024-05-07 |
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| CN201910074086.5A Active CN109765049B (en) | 2019-01-25 | 2019-01-25 | Fatigue life testing device for main driving chain of escalator |
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| CN112903289B (en) * | 2021-01-19 | 2023-06-06 | 深圳市恩普达工业系统有限公司 | Belt pulley fatigue testing machine |
| CN113567120B (en) * | 2021-09-18 | 2021-12-21 | 潍柴雷沃重工股份有限公司 | Test device for loading of chain harrow passing through bridge |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101776921A (en) * | 2010-01-11 | 2010-07-14 | 大连天禄机电设备制造有限公司 | Main chain tension predicting control system of paraffin continuous shaping machine |
| RU2438113C1 (en) * | 2010-06-15 | 2011-12-27 | Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт имени Г.В. Плеханова (технический университет)" | Test bench to analyse load on mining-and-hauling machine working tools |
| CN103115773A (en) * | 2013-02-07 | 2013-05-22 | 杭州东华链条集团有限公司 | High-speed chain rotation fatigue tester |
| CN103245564A (en) * | 2013-05-23 | 2013-08-14 | 巨人通力电梯有限公司 | Chain tensile parameter testing device |
| CN204027822U (en) * | 2014-06-19 | 2014-12-17 | 广州广日电梯工业有限公司 | The load testing machine of a kind of staircase or walkway kinematic train |
| CN204224068U (en) * | 2014-10-14 | 2015-03-25 | 杭州斯沃德电梯有限公司 | A kind of Stair breakage protective device and escalator |
| CN204731024U (en) * | 2015-07-14 | 2015-10-28 | 黄山中链科技有限公司 | A kind of chain tensioner fatigue experimental device |
| CN106053037A (en) * | 2016-05-31 | 2016-10-26 | 姚建飞 | Step chain fatigue tester |
| CN106226068A (en) * | 2016-07-11 | 2016-12-14 | 盐城工学院 | A kind of churning loss test device and method of testing |
| CN107120398A (en) * | 2017-06-23 | 2017-09-01 | 青岛海西重机有限责任公司 | A kind of tightener sprocket and broken chain detecting device |
| CN108657927A (en) * | 2018-07-10 | 2018-10-16 | 湖州德玛吉电梯有限公司 | Escalator drives coupling arrangement |
| CN209416701U (en) * | 2019-01-25 | 2019-09-20 | 上海市特种设备监督检验技术研究院 | Escalator main drive chain fatigue life testing apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8636140B2 (en) * | 2010-04-26 | 2014-01-28 | Joy Mm Delaware, Inc. | Chain tension sensor |
-
2019
- 2019-01-25 CN CN201910074086.5A patent/CN109765049B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101776921A (en) * | 2010-01-11 | 2010-07-14 | 大连天禄机电设备制造有限公司 | Main chain tension predicting control system of paraffin continuous shaping machine |
| RU2438113C1 (en) * | 2010-06-15 | 2011-12-27 | Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт имени Г.В. Плеханова (технический университет)" | Test bench to analyse load on mining-and-hauling machine working tools |
| CN103115773A (en) * | 2013-02-07 | 2013-05-22 | 杭州东华链条集团有限公司 | High-speed chain rotation fatigue tester |
| CN103245564A (en) * | 2013-05-23 | 2013-08-14 | 巨人通力电梯有限公司 | Chain tensile parameter testing device |
| CN204027822U (en) * | 2014-06-19 | 2014-12-17 | 广州广日电梯工业有限公司 | The load testing machine of a kind of staircase or walkway kinematic train |
| CN204224068U (en) * | 2014-10-14 | 2015-03-25 | 杭州斯沃德电梯有限公司 | A kind of Stair breakage protective device and escalator |
| CN204731024U (en) * | 2015-07-14 | 2015-10-28 | 黄山中链科技有限公司 | A kind of chain tensioner fatigue experimental device |
| CN106053037A (en) * | 2016-05-31 | 2016-10-26 | 姚建飞 | Step chain fatigue tester |
| CN106226068A (en) * | 2016-07-11 | 2016-12-14 | 盐城工学院 | A kind of churning loss test device and method of testing |
| CN107120398A (en) * | 2017-06-23 | 2017-09-01 | 青岛海西重机有限责任公司 | A kind of tightener sprocket and broken chain detecting device |
| CN108657927A (en) * | 2018-07-10 | 2018-10-16 | 湖州德玛吉电梯有限公司 | Escalator drives coupling arrangement |
| CN209416701U (en) * | 2019-01-25 | 2019-09-20 | 上海市特种设备监督检验技术研究院 | Escalator main drive chain fatigue life testing apparatus |
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