CN213834189U - Escalator step chain ring holding type distribution monitoring system - Google Patents
Escalator step chain ring holding type distribution monitoring system Download PDFInfo
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- CN213834189U CN213834189U CN202022998304.5U CN202022998304U CN213834189U CN 213834189 U CN213834189 U CN 213834189U CN 202022998304 U CN202022998304 U CN 202022998304U CN 213834189 U CN213834189 U CN 213834189U
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Abstract
The utility model discloses an escalator step chain ring holding type distribution monitoring system, which comprises a holding type electromagnetic monitoring device, a motion positioning device and a data acquisition and processing module, wherein the holding type electromagnetic monitoring device comprises an electromagnetic module mounting frame and four electromagnetic modules; the four electromagnetic modules are sequentially arranged on four sides of a rectangle; the electromagnetic module comprises an E-shaped magnetic core, an exciting coil and two induction coils, wherein the E-shaped magnetic core comprises a yoke part, a middle pole arm and a side pole arm, the exciting coil is installed on the middle pole arm, and the induction coils are installed on the side pole arm; the data acquisition processing module detects the defects of the step chain plates and the step rollers according to the magnetic flux condition measured by the electromagnetic module; the motion positioning device comprises a support rod, a roller and an encoder. The utility model discloses a magnetic flux of four group electromagnetic module detection step chain intermediate step rollers and step link joint changes, judges and fixes a position the defect, for escalator's in time overhaul provide reliable data support, ensures escalator's operation safety.
Description
Technical Field
The utility model belongs to the technical field of the automatic escalator monitoring, more specifically relates to an automatic escalator step chain link formula distribution monitoring system.
Background
The escalator is used as special equipment, is an important task for transporting passengers in railway and urban rail transit, and is of great importance in safety. In order to ensure the safety of passengers and reduce the occurrence probability of accidents, the escalator needs to be regularly detected and maintained, so that the equipment is ensured to be in a good running state. However, the conventional escalator is mainly repaired manually and periodically and repaired with faults, namely, workers perform periodic inspection when no fault occurs and then repair when a fault occurs, and the mode belongs to a post-accident behavior, cannot effectively prevent the occurrence of the fault and is not beneficial to avoiding major accidents; meanwhile, the periodic maintenance may cause excessive maintenance or untimely maintenance, which results in large time, manpower and material resources consumption, poor effect, and high operation difficulty and cost.
The escalator step chain is a component for connecting steps and driving, transmitting power for the escalator lifting, is a key component of the escalator and is of great importance to the running safety of the escalator. Escalator step chain is by hundreds of cylindrical roller and link joint, because its quantity is numerous, hardly comes out through manual inspection when its inside takes place the defect, consequently can leave over the hidden danger, influences escalator operating condition, threatens passenger's life and property safety. Magnetic field detection, as a nondestructive detection method, can be applied to condition monitoring of escalator step chains. At present, in the patent that is disclosed about the magnetic field monitoring technology, for example, CN201910811217.3 discloses an electromagnetic sensor and a monitoring method for monitoring the state of an elevator traction steel belt, but the patent discloses a method for detecting the state of a steel belt by an electromagnetic sensor, which is an open-loop magnetic flux sensor, the detection precision is low, only one side of the steel belt can be detected, the detection range does not realize the circumferential full coverage of the steel belt, the circumferential position of the steel belt defect cannot be located, the patent sensor only has one set of electromagnet modules, the modules cannot normally work once the modules break down, and the reliability of the sensor is low. Patent CN201910170006.6 a clamping type magnetic flux sensor and its application method, discloses a tensile force of the exposed steel cable in the existing structure is detected through the clamping type magnetic flux sensor, this patent can only detect the internal tensile force of a steel cable, and can't locate the position of the detection point, this patent sensor only has a set of electromagnet module, the module once breaks down and then can't work normally, the reliability of the sensor is lower.
In summary, the monitoring of the existing escalator has the following disadvantages: (1) only one object is monitored by one electromagnetic sensor, and the detection capacity and range are small; (2) the open-loop sensor has low measurement precision, and the closed-loop sensor cannot be disassembled for maintenance and is inconvenient; (3) the E-type electromagnetic sensor structure can only detect one side of the step chain and cannot realize the full coverage of the detected object; (4) the positioning measures for detecting the point defects are insufficient, and the accurate positions of the defects cannot be accurately positioned.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides an automatic staircase step chain link formula distribution monitoring system, its step chain to automatic escalator monitors, and the collection state data for failure analysis, be located the prediction, for automatic escalator's in time overhaul provide reliable data support, provide effectual technological means for the operation safety of guarantee automatic escalator.
In order to achieve the above object, according to the utility model discloses an aspect provides an automatic escalator step chain link embracing type distribution monitoring system, the step chain is including two rows of step link joints that set up side by side and set up a plurality of step rollers between these two rows of step link joints, its characterized in that, this monitoring system is including embracing formula electromagnetic monitoring device, motion positioner and data acquisition and processing module, wherein:
the encircling type electromagnetic monitoring device comprises an electromagnetic module mounting frame and four electromagnetic modules arranged on the electromagnetic module mounting frame, wherein the electromagnetic module mounting frame is provided with a through hole used as a step chain moving channel;
each electromagnetic module comprises an E-shaped magnetic core, an exciting coil and two induction coils, wherein the E-shaped magnetic core comprises a yoke part and three polar arms extending out from the yoke part towards the direction of the through hole, the cross section of the E-shaped magnetic core is E-shaped, the three polar arms are two side polar arms and a middle polar arm positioned between the two side polar arms, the exciting coil is installed on the middle polar arm, and one induction coil is installed on each side polar arm; the moving direction of a part corresponding to the E-shaped magnetic core on the step chain is vertical to the cross section of the E-shaped magnetic core;
the four electromagnetic modules are sequentially arranged on four sides of a rectangle to surround the step chain;
the data acquisition processing module is respectively connected with the induction coils of the electromagnetic modules;
the motion positioning device comprises a supporting rod, a roller and an encoder, wherein one end of the supporting rod is installed on the electromagnetic module mounting frame, the other end of the supporting rod is installed on the roller, the roller is pressed on the step chain plate, and the encoder is installed on the roller.
Preferably, the motion positioning device further comprises a tension spring, one end of the tension spring is mounted on the electromagnetic module mounting frame, and the other end of the tension spring is mounted on the support rod, so that the roller is always pressed on the step chain;
one end of the supporting rod is hinged to the electromagnetic module mounting frame through a hinge shaft, and the center line of the hinge shaft is perpendicular to the center line of the inner arc surface of the yoke.
Preferably, the electromagnetic module mounting bracket includes that first embracing support and second embrace the support, first embracing support and second embrace the support and be the right angle frame, first embrace and install two electromagnetic module on embracing the support and the second embrace the support respectively, first one end of embracing support and second embrace the support is articulated together and the other end is connected through embracing the padlock.
Preferably, the electromagnetic module of the closed loop passing through the step roller on the first embracing bracket is provided in plurality and arranged on the same side of the rectangle;
the electromagnetic module of the closed loop on the second encircling support passing through the step roller is also provided with a plurality of electromagnetic modules and the electromagnetic modules are also arranged on the same side of the rectangle, so that the electromagnetic module mounting frame can be penetrated by a plurality of step chains.
Preferably, the data acquisition processing module comprises a field acquisition device and a remote monitoring terminal which can communicate with the field acquisition device, and the field acquisition device is respectively connected with the induction coils of the electromagnetic modules through integrated signal lines.
Preferably, a fixed support is arranged on the encircling electromagnetic monitoring device, the fixed support is installed on a truss of the escalator, and the encircling electromagnetic monitoring device is located in an area where a step chain in the inclined truss is located.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
1) the utility model provides an automatic escalator step chain ring holding type distribution monitoring system, which utilizes the magnetic elastic effect to monitor the magnetic flux change of step rollers and step chain plates of a step chain by four regions through the distribution of four groups of electromagnetic modules in a rotary opening and closing holding type electromagnetic detection device on four sides of a rectangle, judging the defects of the step rollers and the step chain plates through the change of the magnetic flux, positioning the positions of the defective step rollers and the step chain plates in the section of the step chain, the position of a detection point of the step chain along the moving direction of the step chain is recorded by the motion positioning device, and the position of a defect on the step chain can be accurately positioned by combining the positioning of the section, so that the two-dimensional accurate positioning of the section and the moving direction is realized, reliable data support is provided for the timely maintenance of the escalator, and the operation safety of the escalator is ensured.
2) The utility model discloses an automatic staircase step chain link formula distribution monitoring system, four electromagnetic module encircle and form closed sensor device together, can surround and cover the step chain and detect, and the reliability is high, and detection precision is high, and the defect location is accurate; in addition, a plurality of step chains can be monitored simultaneously, the detection efficiency is high, the device is convenient to mount and maintain, and the effective monitoring of the state of the elevator step chains can be realized.
Drawings
Fig. 1 is a schematic diagram of an escalator step chain link embracing type distribution monitoring system of the present invention;
fig. 2 is a schematic structural diagram of the middle-encircling electromagnetic monitoring device of the present invention;
fig. 3 is an exploded schematic view of the middle encircling electromagnetic monitoring device of the present invention;
fig. 4 is a schematic diagram of an electromagnetic module according to the present invention;
fig. 5 is a schematic diagram of the electromagnetic module mounting rack of the middle-encircling electromagnetic monitoring device according to the present invention after being unfolded;
FIG. 6 is a schematic structural view of the middle exercise positioning device of the present invention;
fig. 7 is a schematic structural diagram of the closed loop of the present invention in which a plurality of encircling electromagnetic monitoring devices are arranged on the electromagnetic module passing through the step roller;
fig. 8 is a schematic structural diagram of the present invention in which a plurality of encircling electromagnetic monitoring devices are arranged on the electromagnetic module of the closed loop passing through the step roller;
fig. 9 is a schematic diagram of the escalator step chain link embracing type distribution monitoring system of the present invention installed on the escalator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 to 9, an escalator step chain 4 encircling type distribution monitoring system, the step chain 4 includes two rows of step chain 4 plates arranged side by side and a plurality of step rollers arranged between the two rows of step chain 4 plates, the monitoring system includes an encircling type electromagnetic monitoring device 1, a motion positioning device 2 and a data acquisition processing module, wherein:
the encircling type electromagnetic monitoring device 1 comprises an electromagnetic module mounting frame and four electromagnetic modules arranged on the electromagnetic module mounting frame, wherein the electromagnetic module mounting frame is provided with a through hole used as a moving channel of the step chain 4; the step chain 4 can pass through the through hole, a gap is reserved between the step chain 4 and the encircling type electromagnetic monitoring device 1, the step chain 4 and the encircling type electromagnetic monitoring device are not in contact, the movement of the step chain 4 is not influenced, and the monitoring of different positions of the step chain 4 is realized.
Each electromagnetic module comprises an E-shaped magnetic core 11, an excitation coil 12 and two induction coils 13, wherein the E-shaped magnetic core 11 comprises a yoke 11 and three pole arms extending from the yoke 11 towards the through hole, the cross section of the E-shaped magnetic core 11 is in an E shape, the three pole arms are two side pole arms 113 and a middle pole arm 112 located between the two side pole arms 113, the excitation coil 12 is mounted on the middle pole arm 112, one induction coil 13 is mounted on each side pole arm 113, magnetic lines emitted by the excitation coil 12 pass through the step chain 4 and then pass through the induction coils 13 on the two sides to form a closed loop, so that a detection area is formed to detect magnetic flux; the two ends of the yoke part 11 of the E-shaped magnetic core 11 can be provided with mounting bosses 14, and the mounting bosses 14 exceed the two side arms, so that the E-shaped magnetic core 11 can be conveniently mounted on the electromagnetic module mounting frame. The moving direction of a part, corresponding to the E-shaped magnetic core 11, on the step chain 4 is vertical to the cross section of the E-shaped magnetic core 11;
the four electromagnetic modules are arranged on four sides of a rectangle in sequence so as to surround the step chain 4; the four electromagnetic modules are respectively a first electromagnetic module 101, a second electromagnetic module 102, a third electromagnetic module 103 and a fourth electromagnetic module 104, the detection areas of the electromagnetic modules on two opposite sides of the rectangle are used for covering the step rollers (the detection area of the rectangular electromagnetic module on one side is used for covering the upper half part of the step roller, the detection area of the rectangular electromagnetic module on the other side is used for covering the lower half part of the step roller), and the detection areas of the electromagnetic modules on the other two opposite sides respectively cover the step chain 4 plates on the corresponding sides.
Four electromagnetic modules of the encircling electromagnetic monitoring device 1, each electromagnetic module is provided with a detection area, so that four detection areas are provided in total, each detection area detects one part of the step chain 4, and the four detection areas can cover detection points of the step chain 4; the magnetic flux detected by the electromagnetic module is compared with the data of the detection area and the data of different detection areas to analyze and judge the state of the step chain 4 at the detection point of the step chain 4.
The data acquisition processing module is respectively connected with the induction coils 13 of the electromagnetic modules so as to analyze the stress of the step chain and detect the defects of the plate 4 and the step roller of the step chain according to the magnetic flux condition measured by the electromagnetic modules.
The motion positioning device 2 comprises a supporting rod 202, a roller 203 and an encoder, wherein one end of the supporting rod 202 is installed on the electromagnetic module mounting frame, the other end of the supporting rod is installed on the roller 203, the roller 203 is pressed on a step chain 4 plate to rotate along with the motion of the step chain 4 plate, and the encoder is installed on the roller 203 to realize the positioning of the step chain 4 through the rotation of the roller 203.
Further, the motion positioning device 2 further comprises a tension spring 201, one end of the tension spring 201 is mounted on the electromagnetic module mounting frame, and the other end of the tension spring 201 is mounted on the supporting rod 202, so that the roller 203 is always pressed on the step chain 4;
one end of the supporting rod 202 is hinged to the electromagnetic module mounting frame through a hinge shaft, and the center line of the hinge shaft is perpendicular to the center line of the inner arc surface of the yoke part 11. The tension spring 201 provides pressing force for the motion positioning device 2, so that the roller 203 is not easy to derail when rotating, and the encoder is used for recording the rotating number of turns of the roller 203, positioning the position of a detection point of the step chain 4 along the axis of the step chain 4 and realizing the defect axis positioning. The detection point of the step chain 4 refers to the position on the step chain detected by the encircling electromagnetic monitoring device 1.
Further, the electromagnetic module mounting bracket includes that first support 105 and the second of embracing are embraced to support 106, first support 105 and the second of embracing is embraced to support 106 and is the right-angle frame, first support 105 and the second of embracing are embraced and two electromagnetic module are installed respectively on the support 106, first support 105 and the second of embracing is embraced to one end of support 106 and is embraced through embracing pivot 108 articulated together, can make first support 105 and the second of embracing embrace support 106 and carry out relative rotation and open and shut, and the other end is connected through embracing padlock 107, can lock the tip of first support 105 and the second of embracing is embraced to support 106. The first electromagnetic module 101 and the fourth electromagnetic module 104 in the encircling electromagnetic monitoring device 1 are respectively installed in the clamping groove of the first encircling support 105 through a fixed buckle 109, and the third electromagnetic module 103 and the fourth electromagnetic module 104 are respectively installed in the clamping groove of the second encircling support 106 through a fixed buckle 109.
Further, the electromagnetic module of the closed loop passing the step roller on the first embracing bracket 105 is provided in plurality and they are arranged on the same side of the rectangle; referring to fig. 7 and 8, the first electromagnetic module 101 is provided in plurality.
The electromagnetic modules of the closed loop on the second encircling support 106 passing through the step rollers are also provided with a plurality of electromagnetic modules and arranged on the same edge of the rectangle, so that the electromagnetic module mounting rack can be used for a plurality of step chains 4 to pass through, and further, the simultaneous monitoring of the plurality of step chains 4 is realized, and the detection efficiency is improved. Referring to fig. 7 and 8, a plurality of third electromagnetic modules 103 are provided.
Further, the data acquisition processing module comprises an on-site acquisition device and a remote monitoring terminal which can communicate with the on-site acquisition device, the on-site acquisition device is respectively connected with the induction coils 13 of the electromagnetic modules through an integrated signal wire 3, the remote monitoring terminal processes the magnetic flux acquired by the encircling electromagnetic monitoring device 1, groups the magnetic flux according to the detection areas of different electromagnetic modules to obtain a cross-section point cloud picture formed by the magnetic flux detection data of the cross section of the step chain 4, analyzes and judges the state of the step chain 4 in the corresponding detection area through the abnormal cross-section point cloud picture, and positions the detection area where the defect is located in the cross section of the step chain 4 so as to obtain the position information of the defect on the cross section of the step chain 4, and the remote monitoring terminal can also obtain the position information of the defect on the moving direction of the step chain 4 according to the feedback of the encoder, the position of the defect on the step chain 4 can be accurately positioned. The electromagnetic module of the encircling electromagnetic monitoring device 1 adopts a general modular design, is connected with a standardized integrated signal line 3, the integrated signal line 3 is connected with a field acquisition device through a standardized joint, the signal line joint is directly pulled out to carry out integral replacement when the electromagnetic module breaks down, the field acquisition device receives all step chain 4 magnetic field data of an escalator, and the step chain data are subjected to primary processing and transmitted to a remote monitoring terminal through wireless networks such as 5G or wired modes.
Further, a fixed support is arranged on the encircling electromagnetic monitoring device 1, the fixed support is installed on a truss 5 of the escalator, and the encircling electromagnetic monitoring device 1 is located in an area where a step chain 4 in the inclined truss 5 is located.
According to another aspect of the present invention, there is provided a monitoring method using the escalator step chain ring embracing type distribution monitoring system, comprising the steps of:
(1) each electromagnetic module of the encircling electromagnetic monitoring device 1 respectively acquires magnetic flux in a corresponding detection area, and the motion positioning device 2 acquires position information of the detection point of the step chain 4 along the moving direction of the step chain 4 along with the motion of the step chain 4;
(2) the magnetic flux and the position information of the detection point of the step chain 4 along the moving direction of the step chain 4 are acquired and transmitted to the field acquisition device of the data acquisition processing module through the integrated signal wire 3;
(3) the field acquisition device transmits all received magnetic fluxes of the step chain 4 of the escalator and position information of detection points of the step chain 4 along the moving direction of the step chain 4 to a remote monitoring terminal of the data acquisition and processing module;
(4) the remote monitoring terminal groups the magnetic fluxes acquired by the encircling type electromagnetic monitoring device 1 according to the detection areas of different electromagnetic modules, and obtains a section point cloud picture formed by magnetic flux detection data of the section of the step chain 4, wherein one section point cloud picture is formed by the magnetic flux detection data of four detection areas at the same part of the step chain 4, and a plurality of section point cloud pictures are arranged along the moving direction of the step chain 4;
(5) screening abnormal section point cloud pictures by a remote monitoring terminal; the remote monitoring terminal merges and stores the abnormal section point cloud picture and the corresponding position information along the moving direction of the step chain 4, the normal section point cloud picture and the position information along the moving direction of the step chain 4 are not merged, are stored after being compressed separately, and are automatically deleted after a period of time.
(6) The remote monitoring terminal analyzes the abnormal section point cloud picture, firstly compares the magnetic fluxes collected by the two induction coils 13 of the same electromagnetic module, secondly compares the magnetic fluxes detected by different electromagnetic modules, and analyzes and judges the state of the detection points of the step chain 4, specifically as follows:
by comparison, if the magnetic fluxes acquired by the two induction coils 13 of the same electromagnetic module are inconsistent, the remote monitoring terminal determines that the detection point of the step chain 4 has a defect, and thus the defect of the part of the step chain detected by the detection area formed by the electromagnetic module correspondingly can be obtained;
the remote monitoring terminal judges the severity of the defects of the detection point of the step chain 4 by comparing the magnetic flux difference degrees detected by different electromagnetic modules;
(7) the remote monitoring terminal generates an analysis result of a detection point of the step chain 4, adds detection area information of a step chain section where the step chain 4 with a problem is located and position information along the moving direction of the step chain 4, and positions the position of the defect along the circumferential direction of the step chain 4 and the position along the moving direction of the step chain 4;
(8) the remote monitoring terminal carries out early warning on the state of the step chain 4 obtained by analysis, and the state is divided into a plurality of levels according to the severity of the bad state, and different levels use different modes for carrying out early warning.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides an automatic staircase step chain link embraces formula distribution monitoring system, the step chain is including two rows of step link joints that set up side by side and set up a plurality of step rollers between these two rows of step link joints, its characterized in that, this monitoring system is including embracing formula electromagnetic monitoring device, motion positioner and data acquisition processing module, wherein:
the encircling type electromagnetic monitoring device comprises an electromagnetic module mounting frame and four electromagnetic modules arranged on the electromagnetic module mounting frame, wherein the electromagnetic module mounting frame is provided with a through hole used as a step chain moving channel;
each electromagnetic module comprises an E-shaped magnetic core, an exciting coil and two induction coils, wherein the E-shaped magnetic core comprises a yoke part and three polar arms extending out from the yoke part towards the direction of the through hole, the cross section of the E-shaped magnetic core is E-shaped, the three polar arms are two side polar arms and a middle polar arm positioned between the two side polar arms, the exciting coil is installed on the middle polar arm, and one induction coil is installed on each side polar arm; the moving direction of a part corresponding to the E-shaped magnetic core on the step chain is vertical to the cross section of the E-shaped magnetic core;
the four electromagnetic modules are sequentially arranged on four sides of a rectangle to surround the step chain;
the data acquisition processing module is respectively connected with the induction coils of the electromagnetic modules;
the motion positioning device comprises a supporting rod, a roller and an encoder, wherein one end of the supporting rod is installed on the electromagnetic module mounting frame, the other end of the supporting rod is installed on the roller, the roller is pressed on the step chain plate, and the encoder is installed on the roller.
2. The escalator step chain loop type distribution monitoring system according to claim 1, wherein the motion positioning device further comprises a tension spring, one end of the tension spring is mounted on the electromagnetic module mounting frame and the other end of the tension spring is mounted on the supporting rod, so that the roller is always pressed against the step chain;
one end of the supporting rod is hinged to the electromagnetic module mounting frame through a hinge shaft, and the center line of the hinge shaft is perpendicular to the center line of the inner arc surface of the yoke.
3. The escalator step chain ring embracing type distribution monitoring system according to claim 1, wherein the electromagnetic module mounting frame comprises a first embracing support and a second embracing support, the first embracing support and the second embracing support are right-angle frames, two electromagnetic modules are respectively mounted on the first embracing support and the second embracing support, one ends of the first embracing support and the second embracing support are hinged together through an embracing rotating shaft, and the other ends of the first embracing support and the second embracing support are connected through an embracing buckle lock.
4. The escalator step chain loop looping type profile monitoring system according to claim 3, wherein said electromagnetic module of the closed loop passing step roller on the first looping bracket is provided in plurality and they are arranged on the same side of the rectangle;
the electromagnetic module of the closed loop on the second encircling support passing through the step roller is also provided with a plurality of electromagnetic modules and the electromagnetic modules are also arranged on the same side of the rectangle, so that the electromagnetic module mounting frame can be penetrated by a plurality of step chains.
5. The escalator step chain loop embracing type distribution monitoring system according to claim 1, wherein the data acquisition and processing module comprises an on-site acquisition device and a remote monitoring terminal capable of communicating with the on-site acquisition device, and the on-site acquisition device is respectively connected with the induction coil of each electromagnetic module through an integrated signal line.
6. The escalator step chain loop type distribution monitoring system according to claim 1, wherein the looping type electromagnetic monitoring device is provided with a fixed support, the fixed support is installed on a truss of an escalator, and the looping type electromagnetic monitoring device is located in a step chain area in an inclined truss.
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| CN202022998304.5U CN213834189U (en) | 2020-12-14 | 2020-12-14 | Escalator step chain ring holding type distribution monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456292A (en) * | 2020-12-14 | 2021-03-09 | 中铁第四勘察设计院集团有限公司 | Escalator step chain link embracing type distribution monitoring system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112456292A (en) * | 2020-12-14 | 2021-03-09 | 中铁第四勘察设计院集团有限公司 | Escalator step chain link embracing type distribution monitoring system and method |
| CN112456292B (en) * | 2020-12-14 | 2024-05-17 | 中铁第四勘察设计院集团有限公司 | Encircling type distribution monitoring system and method for escalator step chain |
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