CN108910413B - Mineral transportation and manned integrated system - Google Patents

Mineral transportation and manned integrated system Download PDF

Info

Publication number
CN108910413B
CN108910413B CN201810520102.4A CN201810520102A CN108910413B CN 108910413 B CN108910413 B CN 108910413B CN 201810520102 A CN201810520102 A CN 201810520102A CN 108910413 B CN108910413 B CN 108910413B
Authority
CN
China
Prior art keywords
belt
passenger
manned
conveyor belt
conveyor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810520102.4A
Other languages
Chinese (zh)
Other versions
CN108910413A (en
Inventor
张茹
李安强
覃黎
张泽天
高明忠
谢晶
贾哲强
查尔晟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan University
Original Assignee
Sichuan University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan University filed Critical Sichuan University
Priority to CN201810520102.4A priority Critical patent/CN108910413B/en
Publication of CN108910413A publication Critical patent/CN108910413A/en
Application granted granted Critical
Publication of CN108910413B publication Critical patent/CN108910413B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G23/00Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B65G23/24Gearing between driving motor and belt- or chain-engaging elements
    • B65G23/30Variable-speed gearing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G21/00Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
    • B65G21/20Means incorporated in, or attached to, framework or housings for guiding load-carriers, traction elements or loads supported on moving surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G43/00Control devices, e.g. for safety, warning or fault-correcting

Abstract

Mineral transportation and take advantage of people integration system belongs to mine transportation equipment field. Comprises a forward conveyor belt and a reverse conveyor belt which are arranged in an upper layer and a lower layer, one end of the forward conveyor belt and one end of the reverse conveyor belt are respectively connected with a conveyor belt transmission unit, the automatic conveying device also comprises a first support column and a second support column, a first passenger belt and a second passenger belt are arranged around the outer sides of the first support column and the second support column, the first passenger belt and the second passenger belt are respectively connected with a first transmission unit and a second transmission unit, the first passenger belt and the second passenger belt are respectively connected with the reverse conveyor belt, the support column is provided with a passenger platform, the passenger platform is connected with the passenger belt, and a worker enters or leaves the passenger belt through the passenger platform; the method is suitable for the mine transmission process.

Description

Mineral transportation and manned integrated system
Technical Field
The invention belongs to the field of mine transportation equipment, and relates to an integrated system for mineral transportation and people taking in a mine, in particular to an integrated system for mineral transportation and people taking in a mine, which has a safety protection function.
Background
Mine transportation is transportation inside a coal mine enterprise and is an essential important production link in coal mine production, and transportation work cannot be left in the coal mine production process; among them, the most important are mineral transportation and transportation by coal mine workers. In the process of descending a well, workers in a coal mine need to walk for hundreds of meters or wait for a long time to carry people, and the most widely used people carrying machine in the prior art is an overhead rope people carrying device (also called a monkey car), so the workers often take a coal mine conveying belt instead of walking in order to save physical strength and time. However, the risk factor of such actions is high, and especially at the place where the conveyor belt is connected with the coal bunker, the crusher, the reversed loader and other equipment, the actions are more likely to cause harm to workers. If the worker can not jump down the conveyor belt or stop the conveyor belt in time, casualty accidents can happen. A steel wire rope pull wire emergency stop device for emergency stop of the conveyor belt is arranged above the conveyor belt in part of coal mines, but in the mode, when workers are frightened or the steel wire rope fails, safety accidents are easy to happen. Meanwhile, the existing transportation system conveys workers and minerals respectively, so that the efficiency is low, and therefore an efficient and safe mineral transportation and manned integrated system is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of filling the blank of the prior art, and provides a system capable of simultaneously transporting minerals and workers, so that the minerals and the workers can be efficiently and safely transported, the time is saved, and safety accidents are prevented.
The technical scheme adopted by the invention for solving the technical problems is as follows: the mineral transportation and manned integrated system comprises a forward conveyor belt and a reverse conveyor belt which are arranged in an upper layer and a lower layer, one end of the forward conveyor belt and one end of the reverse conveyor belt are respectively connected with a conveyor belt transmission unit, the mineral transportation and manned integrated system also comprises a first support column and a second support column, a first manned belt and a second manned belt are arranged around the outer sides of the first support column and the second support column, the first manned belt and the second manned belt are respectively connected with the first transmission unit and the second transmission unit, the first manned belt and the second manned belt are respectively contacted with the reverse conveyor belt and the forward conveyor belt, a manned platform is arranged on the support columns, the manned platform is connected with the manned belt, a worker enters or leaves the manned belt through the manned platform, the mineral transportation and manned integrated system also comprises a central control unit, the central control unit is respectively connected with the conveyor belt transmission unit, the first transmission unit and, The conveying speed of the first passenger belt and the second passenger belt.
Further, still include protector, protector includes infrared detector, and infrared detector links to each other with well accuse unit, and infrared detector is used for surveying whether its position has the staff, when infrared detector detects that there is the staff to appear, when sending the detection signal to well accuse unit, thereby well accuse unit changes the functioning speed of conveyer belt or adult belt through adjusting drive unit.
Further, still include the at least one camera that links to each other with well accuse unit, the camera setting is on the support column, and the camera links to each other with well accuse unit.
Preferably, the first passenger belt and the second passenger belt are provided with baffles on both sides of the forward conveyor belt, the reverse conveyor belt and the first passenger belt.
Specifically, the forward conveyor belt and the reverse conveyor belt are arranged in parallel, and the first passenger belt and the second passenger belt are arranged in parallel.
Furthermore, the support column lateral wall is provided with the cat ladder that supplies the staff to go up and down.
Specifically, a protective guard is arranged on the outer side of the passenger platform.
The invention has the beneficial effects that: simple structure, easily realize, contact with the conveyer belt through taking advantage of people's belt, regulate and control the speed of the two for the staff can get into or leave the conveyer belt through taking advantage of people's belt, and finally realize utilizing conveyer belt conveying mineral and staff, improves the conveyer belt utilization ratio, and save time, in addition, through setting up protector and baffle, guardrail, improves system intelligence and security. The invention is suitable for the mine transmission process.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein, 1-1 is a conveyor belt, 1-2 is a first passenger belt, 1-3 is a second passenger belt, 2 is a baffle, 3-1 and 3-2 are infrared detectors, 4 is a first support column, 5 is a ladder stand, 6 is a second support column, and 7 is a guard rail.
Detailed Description
The technical scheme of the invention is described in detail in the following with reference to the accompanying drawings.
The mineral transportation and man-riding integrated system shown in fig. 1 comprises a conveyor belt 1-1, wherein the conveyor belt comprises a forward conveyor belt and a reverse conveyor belt, and the forward conveyor belt and the reverse conveyor belt are arranged in parallel by an upper layer and a lower layer so as to prevent the conveyor belt from touching and ensure safety. One end of the forward conveyor belt and one end of the reverse conveyor belt are respectively connected with the conveyor belt transmission unit, so that the forward conveyor belt and the reverse conveyor belt run at the same speed. The conveyer belt can the integration conveying mineral and personnel. The passenger carrying belt comprises a first supporting column 4 and a second supporting column 6, a first passenger carrying belt and a second passenger carrying belt are arranged around the outer sides of the first supporting column 4 and the second supporting column 6, and the first passenger carrying belt 1-2 and the second passenger carrying belt 1-3 are arranged in parallel, so that the passenger carrying belts are prevented from touching each other, and the safety is guaranteed. The first passenger belt and the second passenger belt are respectively connected with the first transmission unit and the second transmission unit, and the first passenger belt and the second passenger belt are respectively contacted with the reverse conveying belt and the forward conveying belt. The contact forms are various, taking the first passenger belt and the reverse conveyor belt as an example, if the first passenger belt is circular and the reverse conveyor belt is linear, the first passenger belt and the reverse conveyor belt are tangent, and a worker enters the first passenger belt from the reverse conveyor belt from a tangent point; when the first passenger belt is similar to a rectangle, the reverse conveyor belt is preferably parallel to one side of the first passenger belt and is in close contact with the other side of the first passenger belt, so that when the first passenger belt and the reverse conveyor belt run at the same speed, workers can enter the first passenger belt through the reverse conveyor belt; when the first passenger belt is elliptical, the counter conveyor may be made tangent thereto or parallel to and in close contact with the side thereof. Meanwhile, the contact is a contact in a broad sense, which indicates that the space is in a state of being capable of being contacted, and a certain gap is left between the conveyor belt and the corresponding passenger belt, so long as the personnel can enter or leave the conveyor belt from the passenger belt in a crossing manner.
The support columns are provided with two people carrying platforms which are connected with the first and second people carrying belts, and workers can enter or leave the people carrying belts through the people carrying platforms, and the people carrying platforms can be arranged on the two support columns or only on one support column. The automatic passenger conveyor further comprises a central control unit, wherein the central control unit is respectively connected with the conveyor belt transmission unit, the first transmission unit and the second transmission unit, and the transmission speeds of the conveyor belt, the first passenger belt and the second passenger belt can be controlled through the central control unit.
The support column lateral wall is provided with the cat ladder 5 that supplies the staff to go up and down. When the ladder stand is not arranged, the industrial step can be used for directly realizing the ascending and descending of the working personnel. The crawling ladder can be arranged on the first support column or the second support column only, so that a worker can climb up and down the stairs, and the crawling ladder can be arranged on the first support column or the second support column simultaneously, one of the crawling ladder is arranged in the ascending direction, the other crawling ladder is arranged in the descending direction, and people going to and going off the stairs are prevented from colliding, so that the safety of the people is further guaranteed. In addition, a staircase or an escalator can also be provided.
In order to improve the safety and the intelligence, the system further comprises a protection device, wherein the protection device comprises an infrared detector, and the infrared detector is connected with the central control unit. The area between the infrared detectors is an infrared monitoring area. The infrared ray is mainly used for detecting whether a person is getting on or off the device, if so, the infrared detector sends a detection signal to the central control unit, the central control unit adjusts the transmission unit to change the running speed of the conveyor belt or the passenger conveyor belt, specifically, the central control unit can send a signal to the belt speed adjusting device to adjust the speed of the conveyor belt, and the transmission unit comprises a conveyor belt transmission unit, a first transmission unit and a second transmission unit so as to efficiently realize the speed unification. Preferably, the speed of the conveyor belt can be changed by adjusting the transmission unit of the conveyor belt, and the design does not need to adjust the speed of the passenger belt, is easy to realize and simplifies the steps. In order to further improve the security, be convenient for managers to carry out artificial control to this system, still include the at least one camera that links to each other with well accuse unit, the camera sets up on the support column, and the camera links to each other with well accuse unit, and the camera mainly used real time monitoring, and managers should real time monitoring condition, and when managers discovers in the camera that there is special circumstances, managers can pass through the speed of well accuse unit adjustment corresponding drive unit, even stop the operation. The camera is arranged at the passenger platform, the ladder or the joint of the worker and the adult belt from the conveyor belt in a limited way.
Baffle plates 2 are arranged on two sides of the forward conveyor belt, the reverse conveyor belt, the first passenger belt and the second passenger belt, and the baffle plates 2 can prevent the coal mine from leaking laterally in the transportation engineering and can also provide protection for the passengers. And a protective guard 7 is arranged on the outer side of the passenger platform to prevent workers from falling off, so that the safety is improved.
In this example, the upper layer of the conveyor belt 1-1 is a forward conveyor belt, the lower layer is a reverse conveyor belt, the coal is discharged from the upper layer of the forward conveyor belt, and the height of the coal can be arranged according to actual conditions on site. The first passenger belt 1-2 and the second passenger belt 1-3 are arranged in parallel, the first passenger belt 1-2 is tangent to the reverse conveying belt, and the second passenger belt 1-3 is tangent to the forward conveying belt. The first passenger belt 1-2 is used by workers during working, and the second passenger belt 1-3 is used by workers during work. The manned platform comprises a first manned platform and a second manned platform, workers climbing the ladder can enter a first manned belt through the first manned platform, and enter a second manned platform through the second manned belt, and then descend through the ladder. Preferably, the first support column is a cylinder, and the radius R is arranged according to actual conditions. Speed V of the conveyor belt 1-11Can be determined according to the actual coal transportation requirement, but the speed of the coal transportation device and the speed V of the first passenger belt 1-2 and the second passenger belt 1-3 should be controlled when workers go up and down2、V3Similarly, the first passenger belt 1-2 and the second passenger belt 1-3 are relatively static with the conveyor belt 1-1, and when the worker rides on the conveyor belt 1-1 or descends from the conveyor belt 1-1, the conveyor belt 1-1 can recover the initial speed V1. Velocity V of first passenger belt 1-2 and second passenger belt 1-32、V3The control should be based on centripetal acceleration a, and centripetal acceleration a should not exceed 0.1 g. Velocity V2、V3Calculated according to the following formula:
Figure BDA0001674586570000041
where R is the radius of the first support column and a is the centripetal acceleration.
The infrared monitoring area in the embodiment comprises an upper well monitoring area and a lower well monitoring area, for example, the lower well monitoring area is arranged at the crawling ladder of the second support column, when the infrared detector detects that a worker appears in the lower well monitoring area, a signal is sent to the central control unit, and the central control unit adjusts the speed of the conveyor belt 1-1. The upper well monitoring area is arranged between the infrared detectors 3-1 and 3-2 in the figure 1, and particularly, a group of infrared detectors can be respectively arranged at the front and back of the tangent position of the second passenger belt and the conveyor belt at a certain distance to form a second passenger monitoring area. In order to ensure the safety of personnel, the distance between the infrared detectors 3-1 and 3-2 cannot be less than 3m, when a worker passes through the infrared detector 3-1, the conveyor belt 1-1 is decelerated, and when the worker passes through the infrared detector 3-2, the conveyor belt 1-1 stops rotating. In addition, in order to improve the efficiency, a group of infrared detectors are respectively arranged at a certain distance in front of and behind the tangent position of the first passenger belt and the conveyor belt to form a first passenger monitoring area, so that the running speed of the conveyor belt is improved after workers completely enter the conveyor belt, and the conveying efficiency is improved.
In addition, if the passenger belt is similar to a rectangle, infrared detectors can be respectively arranged at two ends of the passenger belt, which are in parallel contact with the conveyor belt, so as to form a monitoring area. The specific process of using the system for transportation comprises the following three stages:
1. a preparation stage:
before the worker starts to go into the well, the manager turns on the power supply to enable the conveyor belt, the passenger belt and the protection device to start to work normally, wherein the conveyor belt 1-1 is at the speed V when working normally1Normally running, the passenger belts 1-2 and 1-3 move respectively in the counter-clockwise and clockwise directions at the speed of V2、V3And (5) operating.
2. Personnel downhole stage
The working personnel climb to the platform through the left crawling ladder, meanwhile, the infrared detector in the underground monitoring area monitors that a person climbs the crawling ladder, the infrared detector transmits signals to the central control unit, the speed of the conveying belt 1-1 is reduced through the belt speed regulating device, and when the speed of the conveying belt 1-1 and the first speed of the conveying belt 1-1 are matchedAfter the passenger belts 1-2 are the same, the worker enters the first passenger belt 1-2 through the passenger platform, finally gets on the conveyor belt 1-1, and when the worker takes the conveyor belt 1-1 and drives out of the first passenger monitoring area, the speed of the conveyor belt 1-1 is recovered to the original speed V1
3. Working personnel on-well stage
After a worker drives into a second passenger monitoring area through the conveyor belt 1-1, an infrared detector in the area immediately transmits a signal into a system host, then the speed of the transmission 1-1 is rapidly reduced through the central control unit, and the speed of the transmission 1-1 and the speed V of the second passenger belt 1-3 are reduced within 2-3 seconds3And (4) after the two belts are consistent, the worker turns to the second passenger belt 1-3, turns to the passenger platform at the top end, and finally returns to the ground through the ladder.

Claims (7)

1. The mineral transportation and manned integrated system is characterized by comprising a forward conveyor belt and a reverse conveyor belt which are arranged in an upper layer and a lower layer, wherein one end of the forward conveyor belt and one end of the reverse conveyor belt are respectively connected with a conveyor belt transmission unit, the mineral transportation and manned integrated system also comprises a first support pillar (4) and a second support pillar (6), a first manned belt and a second manned belt are arranged around the outer sides of the first support pillar (4) and the second support pillar (6), the first manned belt and the second manned belt are respectively connected with a first transmission unit and a second transmission unit, the first manned belt and the second manned belt are respectively contacted with the reverse conveyor belt and the forward conveyor belt, a manned platform is arranged on the support pillar, the manned platform is connected with the manned belt, and a worker enters or leaves the manned belt through the manned platform, and the mineral transportation and manned integrated system also comprises a central control unit, The first transmission unit is connected with the second transmission unit, the transmission speeds of the conveyor belt, the first passenger belt and the second passenger belt can be controlled through the central control unit, the passenger monitoring device further comprises a protection device, the protection device is arranged at a certain distance position in front of and behind the tangent position of the first passenger belt and the conveyor belt to form a first passenger monitoring area, and/or the protection device is arranged at a certain distance position in front of and behind the tangent position of the second passenger belt and the conveyor belt to form a second passenger monitoring area.
2. The system of claim 1, wherein the guard includes an infrared detector connected to the central control unit, the infrared detector being adapted to detect the presence of a worker at the location, the central control unit being adapted to change the speed of the conveyor or the people mover by adjusting the drive unit when the infrared detector detects the presence of a worker and sends a detection signal to the central control unit.
3. The system of claim 1, further comprising at least one camera coupled to the central control unit, the camera being disposed on the support column, the camera being coupled to the central control unit.
4. The system according to claim 1, wherein baffles (2) are provided on both sides of the forward conveyor, the reverse conveyor, the first passenger belt, and the second passenger belt.
5. The system of claim 1, wherein the forward conveyor is disposed parallel to the reverse conveyor, and the first passenger belt is disposed parallel to the second passenger belt.
6. The system of claim 1, wherein the side walls of the support post are provided with a ladder for a worker to climb up and down.
7. System according to claim 1, characterized in that a protective guard (7) is arranged on the outside of the people platform.
CN201810520102.4A 2018-05-28 2018-05-28 Mineral transportation and manned integrated system Active CN108910413B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810520102.4A CN108910413B (en) 2018-05-28 2018-05-28 Mineral transportation and manned integrated system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810520102.4A CN108910413B (en) 2018-05-28 2018-05-28 Mineral transportation and manned integrated system

Publications (2)

Publication Number Publication Date
CN108910413A CN108910413A (en) 2018-11-30
CN108910413B true CN108910413B (en) 2020-04-28

Family

ID=64410204

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810520102.4A Active CN108910413B (en) 2018-05-28 2018-05-28 Mineral transportation and manned integrated system

Country Status (1)

Country Link
CN (1) CN108910413B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114138027B (en) * 2021-11-29 2023-11-10 创新奇智(上海)科技有限公司 Method and device for controlling speed, electronic equipment and readable storage medium

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1231165A1 (en) * 2001-02-09 2002-08-14 Tokai Rubber Industries, Ltd. Stretchable conveyor belt and method of producing same
CN1836996A (en) * 2006-03-15 2006-09-27 沈阳矿山机械(集团)有限责任公司 Speed-variable cable-driven belt conveyer capable of carrying people and goods
CN201043115Y (en) * 2007-03-12 2008-04-02 北京文泽科技开发有限公司 Rubber belt human carrying device
CN201472375U (en) * 2009-08-31 2010-05-19 常州科研试制中心有限公司 Overhead passenger circumambulation track device for coal mine
CN207029163U (en) * 2017-07-13 2018-02-23 威海丹宏体育用品有限公司 A kind of new skifield person conveyer
CN208518707U (en) * 2018-05-28 2019-02-19 四川大学 Nation and multiply people's integral system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1231165A1 (en) * 2001-02-09 2002-08-14 Tokai Rubber Industries, Ltd. Stretchable conveyor belt and method of producing same
CN1836996A (en) * 2006-03-15 2006-09-27 沈阳矿山机械(集团)有限责任公司 Speed-variable cable-driven belt conveyer capable of carrying people and goods
CN201043115Y (en) * 2007-03-12 2008-04-02 北京文泽科技开发有限公司 Rubber belt human carrying device
CN201472375U (en) * 2009-08-31 2010-05-19 常州科研试制中心有限公司 Overhead passenger circumambulation track device for coal mine
CN207029163U (en) * 2017-07-13 2018-02-23 威海丹宏体育用品有限公司 A kind of new skifield person conveyer
CN208518707U (en) * 2018-05-28 2019-02-19 四川大学 Nation and multiply people's integral system

Also Published As

Publication number Publication date
CN108910413A (en) 2018-11-30

Similar Documents

Publication Publication Date Title
US10118800B2 (en) Method and arrangement for closing doors of an elevator of a multi-car elevator shaft system
KR101622825B1 (en) The safe operating system of escalator using transmission and weight sensor
CN105035937A (en) Electromechanical interlocking control method for safe scram of escalator
CN108910413B (en) Mineral transportation and manned integrated system
CN110716556A (en) Underground coal mine track type large inclination angle inspection robot
CN205187568U (en) Dual -purpose explosion -proof diagonal lift of people's goods
CN206033006U (en) Intelligence automatic escalator system
CN208518707U (en) Nation and multiply people's integral system
WO2017090065A1 (en) Reclaiming rope-type plant
CN211765577U (en) Colliery inclined shaft conveying system
KR100983916B1 (en) A emergency escape device for skyscrapers
CN203783109U (en) Building construction operation facility and personnel material transport equipment system
CN106276553A (en) Automatic speed regulation staircase and method of work thereof
CN102303808B (en) Escalator safety strap system
CN105270962B (en) The dual-purpose explosion-proof incline elevator of people's goods
CN205328400U (en) Elevator and lift fall and personnel weigh down well accident emergency rescue system
CN214243594U (en) Automatic control device for preventing petroleum electric drilling machine traveling block from being knocked up and down
CN204474107U (en) A kind of duplex type system cage
CN105084187B (en) The speed controllable method of a kind of mine overhead passenger device and device
CN202717473U (en) Coal mine electric lift
CN2868962Y (en) Pedal walk-aid adhesive-tape conveying apparatus
JP4120926B2 (en) Overhead transport equipment security equipment
KR100789485B1 (en) Escalator for safety
CN206581965U (en) Ventilation unit
CN208454190U (en) A kind of handrail elevator emergency braking security alerting system that monitoring personnel falls

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant