CN107879225B - Corridor elevator - Google Patents
Corridor elevator Download PDFInfo
- Publication number
- CN107879225B CN107879225B CN201711346101.4A CN201711346101A CN107879225B CN 107879225 B CN107879225 B CN 107879225B CN 201711346101 A CN201711346101 A CN 201711346101A CN 107879225 B CN107879225 B CN 107879225B
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- CN
- China
- Prior art keywords
- guide rail
- driving
- wire rope
- steel wire
- half nut
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 238000004804 winding Methods 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 abstract description 2
- 230000008439 repair process Effects 0.000 abstract description 2
- 230000007306 turnover Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
-
- 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
- B66B9/06—Kinds or types of lifts in, or associated with, buildings or other structures inclined, e.g. serving blast furnaces
- B66B9/08—Kinds or types of lifts in, or associated with, buildings or other structures inclined, e.g. serving blast furnaces associated with stairways, e.g. for transporting disabled persons
- B66B9/0807—Driving mechanisms
-
- 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
-
- 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
- B66B9/16—Mobile or transportable lifts specially adapted to be shifted from one part of a building or other structure to another part or to another building or structure
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Automation & Control Theory (AREA)
- Types And Forms Of Lifts (AREA)
Abstract
The invention provides a corridor elevator, which comprises a carrying device for carrying people or things, a running rail and a lifting driving device for driving the carrying device to slide upwards or downwards along the running rail; the lifting driving device comprises a lifting device for driving the carrying device to move up and down and a hanging device for driving the carrying device to move left and right, wherein: the beneficial effects of the invention are as follows: the corridor elevator is perfectly combined with the stairs of the building, has small volume and small occupied area, and does not change the corridor design of the building; the corridor elevator has the advantages of simple structure, convenient installation, low cost and reliable performance; the lifting device is arranged in the carrying device, so that maintenance and repair are facilitated, and the maintenance safety of maintenance personnel is ensured; the guide rail design reliably solves the danger of accidental falling of the corridor elevator, and avoids the design of a complex stop system.
Description
Technical Field
The invention relates to the technical field of elevators, in particular to a corridor elevator applied to up-and-down transportation in a building.
Background
The elevator in the market at present mainly comprises a car elevator dragging and forced driving elevator which moves vertically up and down along a guide rail and a handrail elevator escalator and a moving sidewalk which run in a tilting and continuous mode, and the escalator and the moving sidewalk are respectively used for up-and-down transportation of passengers and articles in high-rise buildings and large-scale markets. The two elevators have large occupied area and high purchase and installation cost, and are not suitable for being additionally arranged in a multi-layer old building. In particular, in multi-storey houses with long construction time, the households of the houses are often old people with inconvenient legs and feet, so that the elevator is necessary to be additionally arranged in the old community.
It is an urgent problem in the industry to provide a corridor elevator which is convenient to install in old communities.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects in the prior art and providing the elevator which is small in size, small in occupied area and low in price and is used in the corridor without changing the structure of the original multi-layer building.
In order to solve the problems, the technical scheme of the invention is as follows:
A corridor elevator, which comprises a carrying device for carrying people or things, a running rail and a lifting driving device for driving the carrying device to slide upwards or downwards along the running rail;
The lifting driving device comprises a lifting device for driving the carrying device to move up and down and a hanging device for driving the carrying device to move left and right, wherein:
the lifting device comprises a winding drum and a first motor, wherein the first motor is used for driving the winding drum to wind up the steel wire rope in a autorotation mode and unwind the steel wire rope downwards;
The hanging device comprises a second motor, a screw rod, a half nut, a horizontal guide rail erected at the top of a building, a steel wire rope and two limit switches arranged at the left end and the right end of the screw rod, wherein:
The half nut is movably sleeved on the screw rod, the top end of the steel wire rope is fixedly connected to the half nut, and the two outward sides of the half nut are respectively erected on two guide bosses on the inner side of the horizontal guide rail, namely, the effect of limiting the half nut is achieved, so that the half nut is prevented from deflecting along the screw rod in the moving process; the second motor is used for driving the half nut and the steel wire rope to reciprocate left and right along the screw rod;
the two limit switches are respectively arranged at the left end and the right end of the screw rod and used for limiting the left or right movement space of the half nut along the screw rod; when the half nut moves to a limit switch positioned at the left end or the right end, the second motor stops driving the screw to rotate and then drives the screw to rotate reversely, so that the half nut moves back along the screw;
The bottom end of the steel wire rope is connected with the winding drum, the carrying device is erected on the upper end surface of the winding drum, the bottom surface of the carrying device is provided with guide wheels, the running rail comprises an upper guide rail and a lower guide rail which are arranged side by side up and down, the guide wheels can be connected with the upper guide rail in a sliding fit manner, and the guide wheels can be connected with the lower guide rail in a meshing fit manner; the design is in order to guarantee that the guide wheel can smoothly slide upwards or downwards along the upper guide rail when the wire rope is pulled, and the lower guide rail which is arranged in a zigzag manner is in order to limit the guide wheel on the lower guide rail when the wire rope is not pulled, so that unnecessary accidents caused by the sliding of the guide wheel are prevented.
As the preferable scheme, be provided with the wiping line that is used for sliding fit to connect the leading wheel in the upper guide rail inboard, the leading wheel is provided with the ratchet downwards, is provided with the row of sawtooth piece that is used for meshing the ratchet on the mating connection leading wheel in the lower guide rail inboard.
Preferably, the outer shell of the half nut adopts a concave pattern, and the pattern is not limited to U shape, L shape, concave shape and the like.
As a preferable scheme, the steel wire rope winds upwards around the half nut, then is combined with the steel wire rope positioned below the half nut downwards, and is fixedly locked through a plurality of buckles.
As an optimal scheme, the carrying device is a platform type carrying device and comprises a manned platform, a control handle and a normally closed turnover mechanism. Wherein: the normally closed turnover mechanism can ensure that the manned platform is turned out to stand by passengers in the corridor under the action of external force when people are carried, and the platform is automatically retracted and restored to the original state when people leave, so that occupation of corridor space is reduced, and the manned corridor elevator is ensured to still keep still under the condition that a user mistakenly touches a control handle.
Compared with the prior art, the invention has the beneficial effects that:
1. the corridor elevator is perfectly combined with the stairs of the building, has small volume and small occupied area, and does not change the corridor design of the building;
2. the corridor elevator has the advantages of simple structure, convenient installation, low cost and reliable performance;
3. the lifting device is arranged in the carrying device, so that maintenance and repair are facilitated, and the maintenance safety of maintenance personnel is ensured;
4. The guide rail design of the invention reliably solves the danger of accidental falling of the corridor elevator and avoids the design of a complex stop system.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic view of a suspension device according to the present invention;
fig. 3 is a schematic structural diagram of a lifting device in the invention.
Reference numerals: 1. a second motor; 2. a screw rod; 3. a half nut; 4. a horizontal guide rail; 5. a wire rope; 6. a carrying device; 7. a manned platform; 8. a guide wheel; 9. a reel; 10. a first motor; 11. a running rail; 12. a guide boss; 13. a buckle; 14. an upper guide rail; 15. a ratchet wheel; 16. saw teeth; 17. a pressing plate; 18. a lower guide rail; 19. a trolley line; 20. rope grooves; 21. a guide boss; 22. a limit switch;
Detailed Description
In accordance with the method concepts of the present invention, embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
As shown in fig. 1 to 3: the invention provides a specific embodiment of a corridor elevator, which comprises a carrying device 6 for carrying people or objects, a running rail 11 and a lifting driving device for driving the carrying device 6 to slide upwards or downwards along the running rail 11;
the lifting driving device comprises a lifting device for driving the carrying device 6 to move up and down and a hanging device for driving the carrying device 6 to move left and right, wherein:
the lifting device comprises a winding drum 9 and a first motor 10 for driving the winding drum 9 to wind the steel wire rope 5 automatically and unwind the steel wire rope 5 downwards;
the suspension device comprises a second motor 1, a screw rod 2, a half nut 3, a horizontal guide rail 4 erected on the top of a building, a steel wire rope 5 and two limit switches 22 arranged at the left end and the right end of the screw rod 2, wherein:
The half nut 3 is movably sleeved on the screw rod 2, the top end of the steel wire rope 5 is fixedly connected to the half nut 3, and the two outward sides of the half nut 3 are respectively erected on two guide bosses 12 on the inner side of the horizontal guide rail 4, namely, the limit effect of the half nut 3 is achieved, so that the half nut 3 is prevented from deflecting along the screw rod 2 in the moving process; the second motor 1 is used for driving the half nut 3 and the steel wire rope 5 to reciprocate left and right along the screw rod 2;
Two limit switches 22 are respectively arranged at the left and right ends of the screw rod 2 and are used for limiting the space for the half nut 3 to move leftwards or rightwards along the screw rod 2; to prevent the half nut 3 from moving leftwards or rightwards and separating from the screw 2, when the half nut 3 moves to the limit switch 22 at the left end or the right end, the second motor 1 stops driving the screw 2 to rotate and then the second motor 1 drives the screw 2 to rotate reversely, so that the half nut 3 moves backwards along the screw 2;
the bottom end of the steel wire rope 5 is connected with a winding drum 9, the carrying device 6 is erected on the upper end surface of the winding drum 9, the bottom surface of the carrying device 6 is provided with a guide wheel 8,
The running rail 11 comprises an upper guide rail 14 and a lower guide rail 18 which are arranged side by side up and down, the guide wheel 8 can be connected with the upper guide rail 14 in a sliding fit manner, and the guide wheel 8 can be connected with the lower guide rail 18 in a meshing fit manner;
The design is in order to ensure that the guide wheel 8 can smoothly slide upwards or downwards along the upper guide rail 14 when the steel wire rope 5 is in traction, and the lower guide rail 18 which is arranged in a zigzag manner is in order to limit the guide wheel 8 on the lower guide rail 18 when the steel wire rope 5 is not in traction, so that unnecessary accidents caused by the downward sliding of the guide wheel 8 are prevented.
Wherein: a trolley line 19 for sliding fit connection with the guide wheel 8 is arranged on the inner side of the upper guide rail 14, the guide wheel 8 is downwards provided with a ratchet wheel 15, and a row of saw-tooth blocks 16 for meshing fit connection with the ratchet wheel 15 on the guide wheel 8 is arranged on the inner side of the lower guide rail 18. The wire rope 5 winds up the half nut 3 and then is combined with the wire rope 5 positioned below the half nut 3 downwards, and is fixedly locked through a plurality of buckles 13. The carrying device 6 is a platform type carrying device and comprises a manned platform 7, a control handle and a normally closed turnover mechanism. The normally closed turnover mechanism can ensure that the manned platform is turned out to stand by passengers in the corridor under the action of external force when people are carried, and the platform is automatically retracted and restored to the original state when people leave, so that occupation of corridor space is reduced, and the manned corridor elevator is ensured to still keep still under the condition that a user mistakenly touches a control handle.
Specifically: the end part of the screw rod 2 is connected with a second motor 1, the second motor 1 drives the screw rod 2 to rotate, so that the half nut 3 reciprocates back and forth along the axis direction of the screw rod 2, when the half nut 3 touches the limit switch 22, the second motor 1 changes the rotation direction, and the half nut 3 is vertically and fixedly connected with the steel wire rope 5 through a buckle 13.
As shown in fig. 2, in order to ensure that the nut is easily removed and replaced when the threads of the screw rod 2 are damaged, a half nut 3 is specially used, and the form is not limited to U-shape, L-shape, concave shape, etc.
As shown in fig. 2, in order to ensure that the screw rod 2 is not pulled vertically downwards by the steel wire rope 5, a guide boss 12 is cut at the horizontal guide rail 4 and is matched with a guide boss 21 of the half nut 3.
As shown in fig. 2, in order to ensure that the steel wire rope 5 can be fixedly connected with the half nut 3 in a reliable vertical manner, and facilitate replacement and cutting after growth of the steel wire rope 5, a rope groove 20 is cut at the half nut 3, so that the steel wire rope 5 can be attached in the rope groove 20.
As shown in fig. 3, the end of the spool 9 is connected to a first motor 10, and the first motor 10 drives the spool 9 to rotate.
As shown in fig. 3, the winding drum 9 is a single-layer winding drum, the length of the winding wire rope 5 is the vertical distance from the bottom level of the corridor to the top level of the corridor of the carrying device 6 plus the length of two windings of the safety ring of the winding drum 9, so as to ensure that the guide wheel 8 on the carrying device 6 can be tightly attached to the upper guide rail 14 of the running rail 11 in the uniform rotation process of the motor 10 in the lifting device, and ensure that the corridor elevator can ascend along the upper guide rail 14 of the running rail 11 at a uniform speed.
As shown in fig. 3, the carrying device 6 is a platform type carrying device, and comprises a manned platform 7, a control handle and a normally closed turnover mechanism. When people are carried, the manned platform 7 is turned out to the corridor under the action of external force for passengers to stand, and when people leave, the platform is automatically folded and restored to the original state, so that occupation of corridor space is reduced.
In the present invention, as shown in fig. 3, the running rail 11 is installed at a guardrail of a building stair, and is parallel to a handrail surface of the stair guardrail, and is composed of two groups of upper and lower parallel guide rails, each group of guide rails is divided into an upper guide rail 14 and a lower guide rail 18, and the two guide rails are parallel to each other. The lower surface of the upper guide rail 14 is in a track shape, and can provide a running track for the guide wheels 8 in the carrying device 6. The lower surface of the upper guide rail 14 is embedded with a trolley wire 19 for supplying power to the motor 10 in the lifting device. The upper surface of the lower guide rail 18 is provided with a row of saw-tooth blocks 16, when the steel wire rope 5 is broken, the elevator is maintained or the elevator is in a backward sliding phenomenon, the steel wire rope can be meshed with a ratchet wheel 15 arranged on a guide wheel 8 in the carrying device 6, the carrying device 6 is prevented from falling down, and the safety of the elevator and personnel on the elevator is protected.
As shown in fig. 3, the teeth 16 at the upper surface of the lower rail 18 of the two sets of rails are correspondingly half pitch, the teeth of the ratchet wheel 15 at the two guide wheels 8 in the carrier 6 are correspondingly half pitch, and are matched with the teeth 16 at the upper surface of the lower rail 18, so as to ensure that the ratchet wheel 15 and the teeth 16 can be accurately meshed at the latest within 1/4 pitch.
As shown in fig. 3, the number of teeth of the ratchet 15 and the sawtooth block 16 is determined according to actual sites and user requirements.
Example 1 Using a corridor elevator from floor 1 to floor 3:
1. the corridor elevator is found to be stopped at the building 1, and the manned platform is turned over by hand to the corridor;
2. The two feet step on the manned platform, and the two hands hold the control handles on the two sides of the carrying device;
3. turning a control handle on the right hand side, and starting the corridor elevator;
4. when an emergency situation occurs, the right hand or the feet are loosened to leave the manned platform, and the corridor elevator stops;
5. under normal conditions, the corridor elevator is seen to reach 3 floors, the right hand is loosened, the corridor elevator stops, the corridor elevator leaves, and the elevator taking is finished.
Claims (3)
1. The corridor elevator is characterized by comprising a carrying device (7) for carrying people or things, a running rail (11) and a lifting driving device for driving the carrying device (7) to slide upwards or downwards along the running rail (11);
the lifting driving device comprises a lifting device for driving the carrying device (7) to move up and down and a hanging device for driving the carrying device (7) to move left and right, wherein:
The lifting device comprises a winding drum (9) and a first motor (10) for driving the winding drum (9) to rotate and wind up the steel wire rope (5) and loosening the steel wire rope (5) downwards;
the suspension device comprises a second motor (1), a screw rod (2), a half nut (3), a horizontal guide rail (4), a steel wire rope (5) and two limit switches (22) arranged at the left end and the right end of the screw rod (2), wherein:
The half nut (3) is movably sleeved on the screw rod (2), the top end of the steel wire rope (5) is fixedly connected to the half nut (3), the two outer sides of the half nut (3) are respectively erected on two guide bosses (12) on the inner side of the horizontal guide rail (4), and the second motor (1) is used for driving the half nut (3) and the steel wire rope (5) to reciprocate left and right along the screw rod (2);
Two limit switches (22) are respectively arranged at the left end and the right end of the screw rod (2) and used for limiting the space for the half nut (3) to move leftwards or rightwards along the screw rod (2) and changing the running direction of the second motor (1) for driving the screw rod (2);
The bottom end of the steel wire rope (5) is connected with the winding drum (9), the carrying device (7) is erected on the upper end face of the winding drum (9), the bottom surface of the carrying device (7) is provided with guide wheels (8), the running guide rail (11) comprises an upper guide rail (14) and a lower guide rail (18) which are arranged side by side up and down, the guide wheels (8) can be connected with the upper guide rail (14) in a sliding fit manner, and the guide wheels (8) can be connected with the lower guide rail (18) in a meshing fit manner;
A trolley line (19) for supplying power to the first motor (10) is arranged on the inner side of the upper guide rail (14), a ratchet wheel (15) is arranged downwards on the guide wheel (8), and a row of saw-tooth blocks (16) for engaging and connecting the ratchet wheel (15) on the guide wheel (8) are arranged on the inner side of the lower guide rail (18);
The steel wire rope (5) is embedded into the rope groove (20) on the half nut (3) and is combined with the steel wire rope (5) positioned below the half nut (3) and is fixedly locked through a plurality of buckles (13).
2. Corridor elevator according to claim 1, characterized in that the outer casing of the half-nut (3) presents a concave, U-shape or L-shape.
3. Corridor elevator according to claim 1, characterized in that the carrier (6) is a platform-type carrier comprising a people platform (7), a control handle and a normally closed tilting mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711346101.4A CN107879225B (en) | 2017-12-15 | 2017-12-15 | Corridor elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711346101.4A CN107879225B (en) | 2017-12-15 | 2017-12-15 | Corridor elevator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107879225A CN107879225A (en) | 2018-04-06 |
| CN107879225B true CN107879225B (en) | 2024-05-17 |
Family
ID=61770819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711346101.4A Active CN107879225B (en) | 2017-12-15 | 2017-12-15 | Corridor elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107879225B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108726325B (en) * | 2018-07-23 | 2023-07-11 | 三峡大学 | Universal mechanical carrying device for step ladder and use method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4174023A (en) * | 1977-11-08 | 1979-11-13 | Dooley Stephen J | Stairlift |
| DE19858569A1 (en) * | 1998-12-18 | 2000-06-21 | Heinrich Riedl | A hoist system for avoiding the mounting of stairs by elderly or infirm persons in multi-storey buildings has an electrically operated platform or seat alongside the stairs. |
| CN1522945A (en) * | 2003-07-09 | 2004-08-25 | 南京理工科技园股份有限公司 | Safety elevator for multi-layer building |
| CN205151456U (en) * | 2015-12-08 | 2016-04-13 | 安道利佳智能科技（北京）股份公司 | Split type track intelligence elevator of riding instead of walk |
| CN106698155A (en) * | 2017-01-22 | 2017-05-24 | 长安大学 | Relay type lead screw slide rail corridor elevator |
| CN106829694A (en) * | 2017-03-29 | 2017-06-13 | 周口师范学院 | A kind of hanging passageway lift of novel top |
| CN206278799U (en) * | 2016-12-26 | 2017-06-27 | 周贤永 | A kind of handrail express lift |
| CN107032216A (en) * | 2017-05-12 | 2017-08-11 | 华侨大学 | A kind of segmented suspention elevator in corridor |
| CN207748708U (en) * | 2017-12-15 | 2018-08-21 | 浙江省特种设备检验研究院 | A kind of passageway lift |
-
2017
- 2017-12-15 CN CN201711346101.4A patent/CN107879225B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4174023A (en) * | 1977-11-08 | 1979-11-13 | Dooley Stephen J | Stairlift |
| DE19858569A1 (en) * | 1998-12-18 | 2000-06-21 | Heinrich Riedl | A hoist system for avoiding the mounting of stairs by elderly or infirm persons in multi-storey buildings has an electrically operated platform or seat alongside the stairs. |
| CN1522945A (en) * | 2003-07-09 | 2004-08-25 | 南京理工科技园股份有限公司 | Safety elevator for multi-layer building |
| CN205151456U (en) * | 2015-12-08 | 2016-04-13 | 安道利佳智能科技（北京）股份公司 | Split type track intelligence elevator of riding instead of walk |
| CN206278799U (en) * | 2016-12-26 | 2017-06-27 | 周贤永 | A kind of handrail express lift |
| CN106698155A (en) * | 2017-01-22 | 2017-05-24 | 长安大学 | Relay type lead screw slide rail corridor elevator |
| CN106829694A (en) * | 2017-03-29 | 2017-06-13 | 周口师范学院 | A kind of hanging passageway lift of novel top |
| CN107032216A (en) * | 2017-05-12 | 2017-08-11 | 华侨大学 | A kind of segmented suspention elevator in corridor |
| CN207748708U (en) * | 2017-12-15 | 2018-08-21 | 浙江省特种设备检验研究院 | A kind of passageway lift |
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| Publication number | Publication date |
|---|---|
| CN107879225A (en) | 2018-04-06 |
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Address after: 310000 No. 211 Kaixuan Road, Shangcheng District, Hangzhou City, Zhejiang Province Applicant after: Zhejiang Institute of Special Equipment Science Address before: No. 211, Kaixuan Road, Jianggan District, Hangzhou, Zhejiang 310000 Applicant before: ZHEJIANG PROVINCIAL SPECIAL EQUIPMENT INSPECTION AND Research Institute |
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