CN110255328B - External hydraulic lifting fire-fighting system for high-rise building - Google Patents
External hydraulic lifting fire-fighting system for high-rise building Download PDFInfo
- Publication number
- CN110255328B CN110255328B CN201910417956.4A CN201910417956A CN110255328B CN 110255328 B CN110255328 B CN 110255328B CN 201910417956 A CN201910417956 A CN 201910417956A CN 110255328 B CN110255328 B CN 110255328B
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- oil
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 230000003028 elevating effect Effects 0.000 claims 2
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006837 decompression Effects 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/20—Hydrants, e.g. wall-hoses, wall units, plug-in cabinets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/02—Cages, i.e. cars
- B66B11/0226—Constructional features, e.g. walls assembly, decorative panels, comfort equipment, thermal or sound insulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
- B66B11/0423—Driving gear ; Details thereof, e.g. seals actuated pneumatically or hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
- B66B11/043—Driving gear ; Details thereof, e.g. seals actuated by rotating motor; Details, e.g. ventilation
- B66B11/0461—Driving gear ; Details thereof, e.g. seals actuated by rotating motor; Details, e.g. ventilation with rack and pinion gear
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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
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/021—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions the abnormal operating conditions being independent of the system
- B66B5/024—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions the abnormal operating conditions being independent of the system where the abnormal operating condition is caused by an accident, e.g. fire
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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
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
- B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
- B66B5/22—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces by means of linearly-movable wedges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
- B66B9/04—Kinds or types of lifts in, or associated with, buildings or other structures actuated pneumatically or hydraulically
Abstract
The invention discloses an external hydraulic lifting fire-fighting system for a high-rise building, which comprises the building with a plurality of storied corridors and a hydraulic lifter, wherein the hydraulic lifter comprises a stand column, a lift car and a rack which are arranged on one side of the stand column, and a hydraulic lifting system, the hydraulic lifting system comprises an oil pump, an oil tank, a main electromagnetic reversing valve and a hydraulic motor, and gears are fixedly connected to output shafts of the hydraulic motor; two external oil ports of the hydraulic motor are respectively connected with a working oil port of each main electromagnetic reversing valve, and one external oil port is also connected with a working oil port of each main electromagnetic reversing valve through a one-way speed regulating valve; a speed regulating valve and a normally open type electromagnetic reversing valve which are connected are arranged between the two external oil ports; the invention has the advantages of simple structure, low noise and low energy consumption, and once power is cut off, the lift car can be forced to descend in time, thereby greatly improving the safety, ensuring the life safety of personnel in case of fire and being convenient to operate.
Description
Technical Field
The invention relates to a building fire-fighting system, in particular to an external hydraulic lifting fire-fighting system for a high-rise building, which can be used as a hydraulic lifting system special for fire fighting.
Background
At present, elevators for high-rise buildings, whether passenger elevators, freight elevators or fire elevators, mostly adopt motors and mechanical transmission devices to realize the lifting of a lift car; the motor has more accessory equipment, high noise and high energy consumption, and the most important is that: once power is cut off, the lift car stays in the air for a long time and cannot be forced to descend, potential safety hazards are brought to personnel and goods, and particularly when fire disasters occur, the personnel cannot be forced to descend in time and life is threatened; other hydraulic elevators also have the problem that the car stays in the air for a long time and cannot be forced to descend when power is cut off.
Disclosure of Invention
The invention aims to provide an external hydraulic lifting fire-fighting system for a high-rise building, which has the advantages of simple structure, low noise and low energy consumption, and can ensure the life safety of personnel in case of fire and is convenient to operate.
In order to achieve the purpose, the external hydraulic lifting fire-fighting system for the high-rise building comprises a building with a plurality of storied corridors and a hydraulic lifter arranged on the outer wall of the building, and is characterized in that the hydraulic lifter comprises a stand column fixedly arranged on the outer wall of the building, a lift car arranged on one side of the stand column in a sliding manner through a roller, a rack fixedly arranged on one side wall of the stand column and a hydraulic lifting system, the hydraulic lifting system comprises a main electromagnetic reversing valve connected with an oil tank through an oil pump and an oil return pipe and more than one hydraulic motor fixedly arranged on the lift car, gears are fixedly connected to output shafts of the hydraulic motors, and the gears are meshed with the racks; two external oil ports of the hydraulic motor are respectively connected with a working oil port of each main electromagnetic reversing valve, wherein one external oil port is connected with a working oil port of each main electromagnetic reversing valve through a one-way speed regulating valve; a speed regulating valve and a normally open type electromagnetic reversing valve which are connected are arranged between two external oil ports of the hydraulic motor; one side of the upright post is fixedly provided with a longitudinal brake plate, a brake box and a plunger pump are fixedly arranged on the lift car, the outer end of the brake plate is positioned in the brake box, the brake box is sleeved at the outer end of each brake plate in a sliding manner, a brake oil cylinder is fixedly connected to the brake box, a driving wedge block connected with a piston rod of the brake oil cylinder is arranged in the brake box, a movable wedge block is arranged in the brake box between the driving wedge block and the brake plate, and the driving wedge block and the movable wedge block are provided with conical surfaces matched with each other; a rodless cavity oil port of the brake oil cylinder is connected with an oil outlet of the plunger pump, a rod cavity oil port of the brake oil cylinder is connected with the oil pump, an oil inlet of the plunger pump is connected with the oil tank, an oil outlet of the plunger pump is also connected with the oil tank through a throttle valve, an input shaft of the plunger pump is fixedly connected with a follow-up gear, and the follow-up gear is meshed with the rack; a fire hydrant is arranged in the lift car, and an inlet of the fire hydrant is connected with a hose;
when the elevator is normally used, the hydraulic motor works, and the lift car ascends or descends through the gear rack mechanism; the lift car is driven by the hydraulic system, so that the structure is simple, the noise is low, the energy consumption is low, once power is cut off, the sliding valve of the normally-open electromagnetic directional valve returns to the initial position, the two external oil ports of the hydraulic motor are communicated, the high-pressure cavity of the motor replenishes oil for the low-pressure cavity to form a closed loop, the hydraulic motor idles and does not provide power any more, the lift car can automatically force to descend in time by virtue of dead weight, the descending speed can be controlled by the speed regulating valve, the safety of personnel and goods is greatly improved, the personnel can be ensured to evacuate in time in case of fire, and; the hose of the fire hydrant is connected with a water pipe outside the building, so that fire can be extinguished on each floor in time; if the oil pipe bursts and loses pressure, the lift car stalls and falls, the follow-up gear rotates, the plunger pump starts to supply oil, a part of oil returns to the oil tank through the throttle valve, the throttle valve generates back pressure at the moment, so that the oil under pressure entering a rodless cavity of the brake oil cylinder pushes the active wedge block to extend out, the active wedge block pushes the movable wedge block to lock the brake plate, the lift car stops falling, stalling can be prevented, and abnormal falling is avoided;
as a further improvement of the invention, a supporting block is arranged between the active wedge block and the brake box, and the supporting block and the movable wedge block are positioned at two sides of the active wedge block; the support block can improve the rigidity of the active wedge block, so that the locking force is improved;
as a further improvement of the invention, the upright post is an I-beam, and the brake plate is a parallel plate of the I-beam; the parallel plate of the I-beam is used as a brake plate, so that the structure of the upright post can be simplified;
as a further improvement of the invention, the hydraulic motors are two and are connected in series; the load and the safety can be improved;
as a further improvement of the invention, a bidirectional balance valve is arranged between two external oil ports of the hydraulic motor; impact can be reduced when ascending and descending are switched;
as a further improvement of the invention, the normally open type electromagnetic directional valve is connected with the speed regulating valve after being connected with a ball valve in parallel; once the normally open type electromagnetic directional valve is abnormal or needs to be actively forced to descend, the ball valve can be manually opened, the lift car descends, the safety is improved, and the operation is convenient;
as a further improvement of the invention, a fire-fighting escape room is arranged outside the fire-fighting elevator door of each corridor; when a fire disaster happens, the fire-fighting house can provide temporary protection; the hydraulic elevator is arranged on the outer side of the building, so that people can conveniently enter and exit, the space in the building is not occupied, and the utilization rate of the building is improved; the fire-fighting escape room is convenient for gathering the personnel, escaping through the fire-fighting hoisting machine and enabling the fire-fighting personnel to enter the building fire-fighting operation from the room;
in conclusion, the invention has the advantages of simple structure, low noise and low energy consumption, and once power is cut off, the lift car can be forced to descend in time, thereby greatly improving the safety, ensuring the life safety of personnel in case of fire and being convenient to operate.
Drawings
FIG. 1 is a top view of an embodiment of the present invention.
Fig. 2 is an enlarged view of the hydraulic lifter of fig. 1.
Fig. 3 is a bottom view of fig. 2.
Fig. 4 is a partially enlarged view of the braking device of fig. 2.
Fig. 5 is a hydraulic schematic of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, the external hydraulic lifting fire-fighting system for high-rise buildings comprises a building 31 with multiple stories of corridors, and a hydraulic lifter 32 arranged on the outer wall of the building 31, wherein a fire-fighting escape room 33 is arranged outside a fire-fighting elevator door of each story of corridor;
the hydraulic lifting machine 32 comprises an upright post 1 of an I-beam structure fixedly arranged on the outer wall of the building 31, a car 3 arranged on one side of the upright post 1 in a sliding manner through a plurality of rollers 2, a rack 13 fixedly arranged on the side wall of one side of the upright post 1, a hydraulic lifting system and a braking device 4, wherein the hydraulic lifting system comprises a main electromagnetic directional valve 7 connected with an oil tank 6 through an oil pump 5 and an oil return pipe, two hydraulic motors 8 fixedly arranged on the car 3 and connected in series, a gear 14 is fixedly connected to the output shaft of each hydraulic motor 8, the gear 14 is meshed with the rack 13, two external oil ports of the two hydraulic motors 8 are respectively connected with a working oil port A or B of the main electromagnetic directional valve 7 through oil pipes, and one of the external oil ports is connected with a working oil port B of the main electromagnetic directional valve; a speed regulating valve 10 and a normally open type electromagnetic directional valve 11 which are connected are arranged between two external oil ports of the two hydraulic motors 8, a ball valve 12 is connected with the normally open type electromagnetic directional valve 11 in parallel, and a bidirectional balance valve 15 is arranged between the two external oil ports of the two hydraulic motors 8; a fire hydrant 27 is arranged in the car 3, and a hose (not shown) is connected with an inlet of the fire hydrant 27;
the braking device 4 comprises a longitudinal parallel plate of the I-beam upright post 1 as a braking plate 16 and a braking box 17 fixedly arranged on the car 3, the outer end of the braking plate 16 is positioned in the braking box 17, the braking box 17 is sleeved at the outer end of each braking plate 16 in a sliding way through an opened notch, a braking oil cylinder 18 is fixedly connected on the braking box 17, a driving wedge block 19 connected with a piston rod of the braking oil cylinder 18 is arranged in the braking box 17, a movable wedge block 20 is arranged in the braking box 17 between the driving wedge block 19 and the braking plate 16, the driving wedge block 19 and the movable wedge block 20 are provided with matched conical surfaces, a supporting block 21 is also arranged between the driving wedge block 19 and the braking box 17, and the supporting block 21 and the movable wedge block 20 are positioned at two sides of the driving wedge block; a rodless cavity oil port 22 of the brake oil cylinder 18 is connected with an oil outlet of a plunger pump 23, the plunger pump 23 is also fixedly connected to the car 3, an oil inlet of the plunger pump 23 is connected with the oil tank 6 through a pipeline, an oil outlet of the plunger pump 23 is also connected with the oil tank 6 through a throttle valve 24, an input shaft of the plunger pump 23 is fixedly connected with a follow-up gear 25, and the follow-up gear 25 is meshed with the rack 13;
when the hydraulic lift car is normally used, the oil pump 5, the main electromagnetic directional valve 7 and the normally-open type electromagnetic directional valve 11 are electrified, the main electromagnetic directional valve 7 is switched on, the hydraulic motor 8 works, the lift car 3 is lifted or descended through the gear 14 and the rack 13, meanwhile, the slide valve of the normally-open type electromagnetic directional valve 11 is reversed, two external oil ports of the two hydraulic motors 8 are disconnected, and the normal work of the hydraulic motors 8 is ensured; the one-way speed regulating valve 9 can control the descending speed to avoid sudden dropping; the bidirectional balance valve 15 can reduce impact when switching between ascending and descending; when a fire breaks out, the hose of the fire hydrant 27 is connected with a water pipe outside a building, so that fire can be extinguished on each floor in time;
the lift car 3 is driven by the hydraulic system, so that the structure is simple, the noise is low, the energy consumption is low, once power is cut off, the sliding valve of the normally-open electromagnetic directional valve 11 returns to the initial position, the two external oil ports of the hydraulic motor 8 are communicated, the high-pressure cavity of the motor replenishes oil for the low-pressure cavity to form a closed loop, the hydraulic motor 8 idles and does not provide power any more, the lift car 3 can automatically force down in time by virtue of dead weight, the descending speed can be controlled by the speed regulating valve 10, the safety of personnel and goods is greatly improved, the personnel can be guaranteed to evacuate in time in case of fire, and the life; the two hydraulic motors 8 connected in series can improve the load and the safety; once the normally open type electromagnetic directional valve 11 is abnormal or needs to be actively forced to descend, the ball valve 12 can be manually opened, the car 3 descends, the safety is improved, and the operation is convenient; if oil pipes burst and lose pressure, the car 3 stalls and falls down, the follow-up gear 25 is acted by the rack 13 to rotate forward at a high speed, at the moment, the rod cavity of the brake oil cylinder 18 loses pressure, the plunger pump 23 starts to supply oil, a part of oil returns to the oil tank 6 through the throttle valve 24, the throttle valve 24 generates back pressure at the same time, so that the oil with pressure entering the rodless cavity of the brake oil cylinder 18 pushes the active wedge block 19 to extend out, the active wedge block 19 pushes the movable wedge block 20 to lock the brake plate 16, the car 3 stops descending, stall can be prevented, and abnormal falling is avoided; the supporting block 21 can improve the rigidity of the active wedge block 19, thereby improving the locking force; when the car 3 ascends, the follow-up gear 25 rotates reversely, the plunger pump 23 does not supply oil, and the rodless cavity of the brake oil cylinder 18 is in a decompression state without braking action and influencing the ascending of the car 3;
the hydraulic lifting machine 32 is arranged on the outer side of the building, so that people can conveniently get in and out, space in the building is not occupied, and the utilization rate of the building is improved; the fire escape room 33 facilitates the gathering of people, escape through a fire hoist, and entry of fire fighters into the building fire fighting operation therefrom.
Claims (7)
1. An external hydraulic lifting fire-fighting system for high-rise buildings comprises a building with multiple stories and a hydraulic lifter arranged on the outer wall of the building, and is characterized in that the hydraulic lifter comprises a stand column fixedly arranged on the outer wall of the building, a lift car arranged on one side of the stand column in a sliding manner through rollers, a rack fixedly arranged on one side wall of the stand column and a hydraulic lifting system, the hydraulic lifting system comprises a main electromagnetic reversing valve connected with an oil tank through an oil pump and an oil return pipe, and more than one hydraulic motor fixedly arranged on the lift car, gears are fixedly connected to output shafts of the hydraulic motors, and the gears are meshed with the racks; two external oil ports of the hydraulic motor are respectively connected with a working oil port of each main electromagnetic reversing valve, wherein one external oil port is connected with a working oil port of each main electromagnetic reversing valve through a one-way speed regulating valve; a speed regulating valve and a normally open type electromagnetic reversing valve which are connected are arranged between two external oil ports of the hydraulic motor; one side of the upright post is fixedly provided with a longitudinal brake plate, a brake box and a plunger pump are fixedly arranged on the lift car, the outer end of the brake plate is positioned in the brake box, the brake box is sleeved at the outer end of each brake plate in a sliding manner, a brake oil cylinder is fixedly connected to the brake box, a driving wedge block connected with a piston rod of the brake oil cylinder is arranged in the brake box, a movable wedge block is arranged in the brake box between the driving wedge block and the brake plate, and the driving wedge block and the movable wedge block are provided with conical surfaces matched with each other; a rodless cavity oil port of the brake oil cylinder is connected with an oil outlet of the plunger pump, a rod cavity oil port of the brake oil cylinder is connected with the oil pump, an oil inlet of the plunger pump is connected with the oil tank, an oil outlet of the plunger pump is also connected with the oil tank through a throttle valve, an input shaft of the plunger pump is fixedly connected with a follow-up gear, and the follow-up gear is meshed with the rack; a fire hydrant is arranged in the lift car, and a hose is connected with an inlet of the fire hydrant.
2. The high-rise building external hydraulic lifting fire-fighting system according to claim 1, wherein support blocks are provided between the driving wedge and the brake box, and the support blocks and the movable wedge are located on both sides of the driving wedge.
3. The high-rise building external hydraulic lifting fire-fighting system according to claim 1 or 2, wherein the column is an i-beam, and the brake plate is a parallel plate of the i-beam.
4. The high-rise building external hydraulic elevating fire extinguishing system as recited in claim 3, wherein said hydraulic motors are two and connected in series.
5. The external hydraulic elevating fire-fighting system for high-rise buildings according to claim 4, wherein a two-way balance valve is provided between the two external oil ports of the hydraulic motor.
6. The high-rise building external hydraulic lifting fire-fighting system as claimed in claim 5, wherein the normally open electromagnetic directional valve is further connected in parallel with a ball valve and then connected with the speed regulating valve.
7. The external hydraulic lifting fire-fighting system for high-rise buildings according to claim 1 or 6, characterized in that a fire escape room is arranged outside the fire elevator door of each corridor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910417956.4A CN110255328B (en) | 2019-05-20 | 2019-05-20 | External hydraulic lifting fire-fighting system for high-rise building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910417956.4A CN110255328B (en) | 2019-05-20 | 2019-05-20 | External hydraulic lifting fire-fighting system for high-rise building |
Publications (2)
| Publication Number | Publication Date |
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| CN110255328A CN110255328A (en) | 2019-09-20 |
| CN110255328B true CN110255328B (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910417956.4A Active CN110255328B (en) | 2019-05-20 | 2019-05-20 | External hydraulic lifting fire-fighting system for high-rise building |
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| CN (1) | CN110255328B (en) |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2052401U (en) * | 1989-08-23 | 1990-02-07 | 刘汉斌 | Air pressure flat floor device for the elevator |
| TW513374B (en) * | 2000-12-08 | 2002-12-11 | Inventio Ag | Safety brake with retardation-dependent braking force |
| US7165650B2 (en) * | 2002-07-26 | 2007-01-23 | Korchagin Pavel V | High-rise, fire-fighting, rescue and construction equipment |
| CN1994844A (en) * | 2006-01-06 | 2007-07-11 | 温建 | Lifting operation method and apparatus for mounting guide rail on outer wall of architecture |
| JP5341400B2 (en) * | 2008-06-03 | 2013-11-13 | 株式会社嘉穂製作所 | Manual lowering device in case of power failure of elevator |
| CN201367286Y (en) * | 2009-03-13 | 2009-12-23 | 倪胡顺 | Platform lifting rail for fire prevention and rescue of high-rise buildings |
| CN101941655A (en) * | 2009-07-07 | 2011-01-12 | 沈丽 | Buffering brake device of winch |
| GB201016023D0 (en) * | 2010-09-24 | 2010-11-10 | Godwin Adrian M | Transportation system |
| CN104675991B (en) * | 2013-11-29 | 2017-06-06 | 天津萨克赛斯机械技术开发有限公司 | A kind of hydraulic synchronization shifting system |
| CN103707923B (en) * | 2013-12-20 | 2016-05-04 | 华南理工大学 | A kind of dual-speed hydraulic steering gear |
| CN103754738B (en) * | 2014-01-29 | 2016-04-27 | 河海大学常州校区 | A kind of Dual Drive lifting mechanism |
| CN105775958A (en) * | 2016-05-10 | 2016-07-20 | 李文明 | Hydraulic drive construction hoist |
| CN206915539U (en) * | 2017-07-10 | 2018-01-23 | 成都见田科技有限公司 | Guide rail-type lifting platform and lift |
| CN107524661B (en) * | 2017-08-25 | 2019-07-23 | 武汉船用机械有限责任公司 | A kind of hydraulic system of rack-and-pinion lifting device |
| CN207158568U (en) * | 2017-09-07 | 2018-03-30 | 中国石油大学(华东) | A kind of new twin-bucket lift |
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2019
- 2019-05-20 CN CN201910417956.4A patent/CN110255328B/en active Active
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Effective date of registration: 20231109 Address after: Inside Jiulishan Neighborhood Committee, Jiulishan Sub-district Office, Macun District, Jiaozuo City, Henan Province 454150 Patentee after: Henan Qingfeng Construction Co.,Ltd. Address before: No. 16, 4th Floor, Jingyuan Commercial and Residential Building, No. 685 Jingyuan Road, Shanyang District, Jiaozuo City, Henan Province, 454150 Patentee before: Henan Yunfeng Supply Chain Management Co.,Ltd. |
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