CN109262177B - Derrick welding platform - Google Patents
Derrick welding platform Download PDFInfo
- Publication number
- CN109262177B CN109262177B CN201811379481.6A CN201811379481A CN109262177B CN 109262177 B CN109262177 B CN 109262177B CN 201811379481 A CN201811379481 A CN 201811379481A CN 109262177 B CN109262177 B CN 109262177B
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- Prior art keywords
- template
- fixed
- derrick
- movable
- plate
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- 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.)
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- 238000003466 welding Methods 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0461—Welding tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a derrick welding platform, which comprises a bottom plate, a fixed template, a movable template and two groups of conveying devices, wherein the fixed template is fixed on the bottom plate; two fixed blocks are fixed on the fixed template and the movable template, the two fixed blocks are arranged in parallel, and a clamp for clamping the derrick cross beam is arranged on a bottom plate between the fixed template and the movable template. The invention has the advantages that: the welding of a plurality of parts of the derrick can be completed at one time, the position of the cross beam can be limited through the clamp and the fixed block, the welding precision is greatly improved, and a good foundation is laid for normal follow-up work.
Description
Technical Field
The invention relates to a derrick welding platform.
Background
The elevator derrick is a rectangular frame and consists of four upright posts and a plurality of cross beams welded between the upright posts, as shown in fig. 1, the whole derrick is manufactured by dividing the elevator shaft into a plurality of sections due to longer length of the elevator shaft and then spliced into the whole derrick, and as other parts are installed on the upright posts 23 or the cross beams 24 of the derrick through holes, if the welding precision of the upright posts or the cross beams of each section of derrick is not high, the subsequent work is seriously influenced.
Disclosure of Invention
The invention aims to provide a derrick welding platform which can effectively solve the problem of low welding precision of the existing derrick.
In order to solve the technical problems, the invention is realized by the following technical scheme: the derrick welding platform comprises a bottom plate, a fixed template, a movable template and two groups of conveying devices, wherein the fixed template is fixed on the bottom plate, the movable template is movably arranged on the bottom plate, the fixed template and the movable template are arranged back and forth, and the two groups of conveying devices are symmetrically and slidably arranged on the bottom plate about the connecting line of the centers of the fixed template and the movable template;
two fixed blocks are fixed on the fixed template and the movable template, the two fixed blocks are arranged in parallel, and a clamp for clamping the derrick cross beam is arranged on a bottom plate between the fixed template and the movable template.
Preferably, the fixed block is long-strip-shaped, the cross section of the fixed block is concave, a plurality of positioning holes are formed in the fixed block along the height direction, and positioning pins matched with the positioning holes are arranged in the positioning holes. The concave shape can limit three sides of the cross beam, the other side is not limited, the welding is convenient to be carried out with the upright post, and a plurality of positioning holes are matched with the positioning pins, so that the positions of the cross beam with different sizes can be limited.
Preferably, the movable template comprises a movable plate body, a motor, a screw rod and a screw sleeve, wherein the movable plate body is arranged on the bottom plate in a sliding manner along the connecting line between the fixed template and the center of the movable template, the motor is fixed on the bottom plate of one end, far away from the fixed template, of the movable plate body, the screw sleeve is fixed on the movable plate body, and the motor is matched with the screw sleeve through the screw rod to drive the movable plate body to move. The screw rod is driven to rotate through the motor, and the threaded sleeve matched with the screw rod drives the movable plate body to move back and forth, so that the distance between the movable template and the fixed template is adjusted, and the derrick welding device is suitable for derricks with different upright post lengths.
Preferably, the bottom plate is fixed with a sliding rail, and the movable plate body is arranged on the sliding rail in a sliding way through the guide shoe. The guide shoe is matched with the sliding rail, so that the movement of the movable plate body is facilitated.
Preferably, the transporting device comprises a transporting vertical plate and transporting forklift plates, wherein the transporting vertical plate is arranged on the bottom plate in a sliding mode, one end of each transporting forklift plate is connected to the lower end of each transporting vertical plate, and at least two transporting forklift plates are arranged. The derrick position can be limited during welding through the transportation vertical plate, and the transportation forklift plate is convenient for forking and separating the derrick after the derrick is welded.
Preferably, the bottom plate is provided with guide grooves equal to the transport forklift plates in number, one end of each guide groove, far away from the transport vertical plate, is provided with a groove, one end, far away from the transport vertical plate, of each transport forklift plate is provided with a roller, and the surface, close to the transport vertical plate, of each groove is an inclined surface. Through the cooperation of inclined plane and gyro wheel, when needing to pull out the derrick that the welding finishes, along with conveyer moves outwards, the gyro wheel rolls the inclined plane gradually, and the height of whole transportation fork truck board will rise to hold up the derrick, make the derrick break away from the bottom plate, the transportation of the derrick of being convenient for.
Preferably, a transport forklift plate is arranged in each guide groove. Preventing the transportation forklift plates from collision to influence normal operation.
Preferably, the depth of the guide groove is greater than the height of the transport forklift plate. When the transport forklift plate does not play a role, the derrick is directly placed on the bottom plate, and positioning of the derrick is facilitated.
Preferably, the transporting device further comprises a winch and a steel wire rope, the winch is fixedly connected with the transporting vertical plate, one end of the steel wire rope is connected with the winch, and the other end of the steel wire rope bypasses the top end of the transporting vertical plate and then is connected with the welded derrick. The welded derrick is pulled by the winch and the steel wire rope, so that the derrick is more conveniently supported by the transportation forklift plate.
Preferably, the top end of the fixed template is provided with at least one guide post extending towards the direction of the movable template, and the movable template is sleeved on the guide post. The stability of the movement of the movable template is kept, and the parallelism of the movable template and the fixed template is kept.
Compared with the prior art, the invention has the advantages that: corresponding stand is cliied through the cooperation of fixed bolster and movable bolster, then utilizes the fixed block to fix the crossbeam that needs to weld between two stands, and more crossbeams also can be fixed to the anchor clamps that set up simultaneously on the bottom plate, and convenient disposable welding, and in the derrick comparison that the welding finishes, can utilize left side or conveyer on the right side, pulls out the derrick that the welding finishes out the platform. After the device is adopted, the welding of a plurality of parts of the derrick can be completed at one time, the position of the beam can be limited through the clamp and the fixed block, the welding precision is greatly improved, and a good foundation is laid for normal operation of subsequent work.
Drawings
FIG. 1 is a schematic diagram of a derrick structure after welding;
FIG. 2 is a schematic view of the structure of the invention when welding a derrick;
FIG. 3 is a schematic view of the structure of the one-side transporter according to the present invention when pulled out;
FIG. 4 is a schematic view of the other side transport device of the present invention when pulled out;
FIG. 5 is a cross-sectional view of the non-operational state of the transporter and the engagement of the bottom plate in accordance with the present invention;
FIG. 6 is a cross-sectional view of the conveyor of the present invention in operation and the engagement of the floor;
FIG. 7 is a cross-sectional view A-A of FIG. 5;
fig. 8 is a schematic structural view of a base plate in the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. 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.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 2 to 8, which are embodiments of the derrick welding platform of the present invention, the derrick welding platform comprises a bottom plate 1, a fixed template 2, a movable template 3 and two groups of conveying devices 4, wherein the fixed template 2 is fixed on the bottom plate 1, the movable template 3 is movably arranged on the bottom plate 1, the fixed template 2 and the movable template 3 are arranged back and forth, and the two groups of conveying devices 4 are symmetrically and slidably arranged on the bottom plate 1 about the central connecting line of the fixed template 2 and the movable template 3;
two fixing blocks 5 are fixed on the fixed die plate 2 and the movable die plate 3, the two fixing blocks 5 are arranged in parallel, and a clamp 6 for clamping a derrick cross beam is arranged on the bottom plate 1 between the fixed die plate 2 and the movable die plate 3.
Corresponding stand is cliied through the cooperation of fixed bolster 2 and movable bolster 3, then utilizes fixed block 5 to fix the crossbeam that needs to weld between two stands, and more crossbeams also can be fixed to anchor clamps 6 that set up simultaneously on bottom plate 1, and convenient disposable welding, and in the derrick comparison that the welding finishes, can utilize left side or conveyer 4 on the right side, pulls out the derrick that the welding finishes out the platform. After the device is adopted, the welding of a plurality of parts of the derrick can be completed at one time, the position of the beam can be limited through the clamp 6 and the fixed block 5, the welding precision is greatly improved, and a good foundation is laid for normal operation of subsequent work.
Further, the fixed block 5 is long-strip-shaped, the cross section of the fixed block is concave, the fixed block 5 is provided with a plurality of positioning holes 7 along the height direction, and positioning pins matched with the positioning holes 7 are arranged in the positioning holes 7. The three sides of the cross beam can be limited by the concave shape, the other side is not limited, the welding is convenient to be carried out with the upright post, and the positions of the cross beam with different sizes can be limited by the matching of a plurality of positioning holes 7 and positioning pins.
The movable template 3 comprises a movable plate body 8, a motor 9, a screw rod 10 and a screw sleeve 11, wherein the movable plate body 8 is arranged on the bottom plate 1 in a sliding manner along the central connecting line of the fixed template 2 and the movable template 3, the motor 9 is fixed on the bottom plate 1, far away from one end of the fixed template 2, of the movable plate body 8, the screw sleeve 11 is fixed on the movable plate body 8, and the motor 9 is matched with the screw sleeve 11 through the screw rod 10 to drive the movable plate body 8 to move. The screw rod 10 is driven to rotate by the motor, and the threaded sleeve 11 matched with the screw rod 10 drives the movable plate body 8 to move forwards and backwards, so that the distance between the movable template 3 and the fixed template 2 is adjusted, and the welding device is suitable for welding headframes with different upright post lengths. The bottom plate 1 is fixedly provided with a slide rail 12, and the movable plate body 8 is arranged on the slide rail 12 in a sliding manner through a guide shoe 13. The guide shoes 13 are matched with the slide rails 12, so that the movement of the movable plate body 8 is facilitated.
The conveyer 4 also can use gyro wheel 18 and bottom plate 1 rolling friction, reduces the removal resistance of conveyer 4, also can adopt the structure of guide rail slider, reduces the removal helping hand, conveyer 4 includes transportation riser 14, transportation fork truck board 15, transportation riser 14 slides and sets up on bottom plate 1, transportation fork truck board 15 one end is connected at transportation riser 14 lower extreme, transportation fork truck board has two. The position of the derrick can be limited during welding through the transportation vertical plate 14, and the transportation forklift plate 15 is convenient for forking and separating the derrick after the derrick is welded. The bottom plate 1 is provided with guide grooves 16 with the same number as the transport forklift plates 15, one end of each guide groove 16 far away from the transport vertical plate 14 is provided with a groove 17, one end of the transport forklift plate 15 far away from the transport vertical plate 14 is provided with a roller 18, and the surface of the groove 17 close to the transport vertical plate 14 is an inclined surface 19. Through the cooperation of inclined plane 19 and gyro wheel 18, when the derrick that finishes is pulled out to the needs, along with conveyer 4 outward motion, gyro wheel 18 rolls inclined plane 19 gradually, and the height of whole transportation fork truck board 15 will rise to hold up the derrick, make the derrick break away from bottom plate 1, the transportation of the derrick of being convenient for. A transport forklift plate 15 is arranged in each guide groove 16. Preventing the transport forklift plates 15 from colliding with each other to affect normal operation. The depth of the guide groove 16 is greater than the height of the transporting fork plate 15. When the transport forklift plate 15 does not play a role, the derrick is directly placed on the bottom plate 1, and positioning of the derrick is facilitated.
Further, the transporting device 4 further includes a winch 20 and a wire rope 21, the winch 20 is fixedly connected with the transporting vertical plate 14, or the winch 20 is fixed on a connecting plate fixedly connected with the transporting vertical plate 14, one end of the wire rope 21 is connected with the winch 20, the other end of the wire rope 21 bypasses the top end of the transporting vertical plate 14 and then is connected with the welded derrick, and a pulley can be arranged at the top end of the transporting vertical plate 14 to reduce friction of the wire rope 21. The welded derrick is pulled by the winch 20 and the steel wire rope 21, so that the derrick is supported by the transportation forklift plate 15.
The top of the fixed template 2 is provided with two guide posts 22 extending towards the direction of the movable template 3, and the movable template 3 is sleeved on the guide posts 22. The stability of the movement of the moving die plate 3 is maintained, and the parallelism of the moving die plate 3 and the fixed die plate 2 is maintained.
When the welding device is used, firstly, the derrick upright columns to be welded are fixed between the movable template 3 and the fixed template 2, and the motor 9 is started to control the movable template 3 to move towards the fixed template 2, so that four upright columns are clamped, and then, the cross beams to be welded are fixed on the fixed blocks 5 and/or the clamps 6 to perform welding operation. After welding is finished, a motor is started, the movable template 3 is controlled to move in a direction away from the fixed template 2, the welded derrick is loosened, then one end of a steel wire rope 21 on one side of the conveying device 4 is tied on the derrick, the conveying vertical plate 14 is pulled to drive the conveying forklift plate 15 to move outwards, one end of the conveying forklift plate 15 is gradually increased due to the contact of a roller 18 of the conveying forklift plate 15 with an inclined plane 19, the derrick is lifted, a winch 20 is started again, the steel wire rope 21 is tensioned, the derrick is pulled out by the conveying forklift plate 15 for a sufficient distance, the derrick is conveniently conveyed out of the platform, and the welding platform can finish integral assembly welding of welded products from a plane to a three-dimensional one time.
The above embodiments are merely illustrative embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.
Claims (7)
1. Derrick welded platform, its characterized in that: the movable template comprises a bottom plate (1), a fixed template (2), a movable template (3) and two groups of conveying devices (4), wherein the fixed template (2) is fixed on the bottom plate (1), the movable template (3) is movably arranged on the bottom plate (1), the fixed template (2) and the movable template (3) are arranged front and back, and the two groups of conveying devices (4) are symmetrically arranged on the bottom plate (1) in a sliding mode relative to the central connecting line of the fixed template (2) and the movable template (3);
two fixed blocks (5) are fixed on the fixed template (2) and the movable template (3), the two fixed blocks (5) are arranged in parallel, and a clamp (6) for clamping a derrick cross beam is arranged on the bottom plate (1) between the fixed template (2) and the movable template (3);
the transporting device (4) comprises transporting vertical plates (14) and transporting forklift plates (15), the transporting vertical plates (14) are arranged on the bottom plate (1) in a sliding mode, one ends of the transporting forklift plates (15) are connected to the lower ends of the transporting vertical plates (14), at least two transporting forklift plates are arranged, and the transporting vertical plates (14) limit the positions of the derricks when in welding;
the bottom plate (1) is provided with guide grooves (16) with the same number as that of the transport forklift plates (15), one end of each guide groove (16) far away from the transport vertical plate (14) is provided with a groove (17), one end of the transport forklift plate (15) far away from the transport vertical plate (14) is provided with a roller (18), and the surface of the groove (17) close to the transport vertical plate (14) is an inclined surface (19);
the fixing block (5) is of a strip shape, the cross section of the fixing block is in a concave shape, a plurality of positioning holes (7) are formed in the fixing block (5) along the height direction, and positioning pins matched with the positioning holes (7) are arranged in the positioning holes.
2. The derrick welding platform of claim 1, wherein: the movable template (3) comprises a movable plate body (8), a motor (9), a screw rod (10) and a screw sleeve (11), wherein the movable plate body (8) is arranged on the bottom plate (1) in a sliding mode along the central connecting line of the fixed template (2) and the movable template (3), the motor (9) is fixed on the bottom plate (1) of the movable plate body (8) far away from one end of the fixed template (2), the screw sleeve (11) is fixed on the movable plate body (8), and the motor (9) is matched with the screw sleeve (11) through the screw rod (10) to drive the movable plate body (8) to move.
3. The derrick welding platform as claimed in claim 2, wherein: the base plate (1) is fixedly provided with a sliding rail (12), and the movable plate body (8) is arranged on the sliding rail (12) in a sliding way through a guide shoe (13).
4. The derrick welding platform of claim 1, wherein: a transport forklift plate (15) is arranged in each guide groove (16).
5. The derrick welding platform of claim 1, wherein: the depth of the guide groove (16) is larger than the height of the transport forklift plate (15).
6. The derrick welding platform of claim 1, wherein: the transporting device (4) further comprises a winch (20) and a steel wire rope (21), the winch (20) is fixedly connected with the transporting vertical plate (14), one end of the steel wire rope (21) is connected with the winch (20), and the other end of the steel wire rope (21) bypasses the top end of the transporting vertical plate (14) and then is connected with the welded derrick.
7. The derrick welding platform of claim 1, wherein: the top end of the fixed template (2) is provided with at least one guide post (22) extending towards the direction of the movable template (3), and the movable template (3) is sleeved on the guide post (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811379481.6A CN109262177B (en) | 2018-11-14 | 2018-11-14 | Derrick welding platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811379481.6A CN109262177B (en) | 2018-11-14 | 2018-11-14 | Derrick welding platform |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109262177A CN109262177A (en) | 2019-01-25 |
| CN109262177B true CN109262177B (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811379481.6A Active CN109262177B (en) | 2018-11-14 | 2018-11-14 | Derrick welding platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109262177B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111215811B (en) * | 2019-08-12 | 2021-08-17 | 杭州顺达伯耐特电梯有限公司 | Well frame welding tool and welding method |
| CN113664394A (en) * | 2021-08-13 | 2021-11-19 | 王道川 | Laser welding equipment for solar heat collection products |
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| GB114154A (en) * | 1917-01-11 | 1919-01-02 | William Chalmers Forbes | An Improved Combined Derrick and Transporter. |
| JP2001340993A (en) * | 2000-05-29 | 2001-12-11 | Tcm Corp | Positioning tool for mast welding |
| JP2002066666A (en) * | 2000-08-24 | 2002-03-05 | Amada Co Ltd | Work carrying in and out method of plate material working machine and its apparatus |
| CN202163930U (en) * | 2011-06-28 | 2012-03-14 | 上海中石化物流股份有限公司 | Fork truck rack |
| CN204958299U (en) * | 2015-07-21 | 2016-01-13 | 袁蓓莎 | Fork truck with hoisting accessory |
| CN105731089A (en) * | 2016-04-27 | 2016-07-06 | 张利平 | Brick pile packaging and loading mechanical integrated system equipment |
| CN106334896A (en) * | 2016-11-18 | 2017-01-18 | 东莞市三威柔性自动化装备有限公司 | Pair Tooling Equipment of Digital Intelligent Knuckle Arm Rest |
| CN207139174U (en) * | 2017-09-12 | 2018-03-27 | 山东明珠专用汽车制造有限公司 | A kind of fluid pressure type longeron assembly frock |
| CN108115049A (en) * | 2018-01-26 | 2018-06-05 | 无锡丰科金属制品有限公司 | A kind of Coil Coating Products roller type mold |
| CN108128713A (en) * | 2017-12-05 | 2018-06-08 | 淮阴工学院 | One kind is based on chaindriven combined type handling apparatus |
| CN209125188U (en) * | 2018-11-14 | 2019-07-19 | 浙江飞亚电梯有限公司 | Head frame welding platform |
-
2018
- 2018-11-14 CN CN201811379481.6A patent/CN109262177B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB114154A (en) * | 1917-01-11 | 1919-01-02 | William Chalmers Forbes | An Improved Combined Derrick and Transporter. |
| JP2001340993A (en) * | 2000-05-29 | 2001-12-11 | Tcm Corp | Positioning tool for mast welding |
| JP2002066666A (en) * | 2000-08-24 | 2002-03-05 | Amada Co Ltd | Work carrying in and out method of plate material working machine and its apparatus |
| CN202163930U (en) * | 2011-06-28 | 2012-03-14 | 上海中石化物流股份有限公司 | Fork truck rack |
| CN204958299U (en) * | 2015-07-21 | 2016-01-13 | 袁蓓莎 | Fork truck with hoisting accessory |
| CN105731089A (en) * | 2016-04-27 | 2016-07-06 | 张利平 | Brick pile packaging and loading mechanical integrated system equipment |
| CN106334896A (en) * | 2016-11-18 | 2017-01-18 | 东莞市三威柔性自动化装备有限公司 | Pair Tooling Equipment of Digital Intelligent Knuckle Arm Rest |
| CN207139174U (en) * | 2017-09-12 | 2018-03-27 | 山东明珠专用汽车制造有限公司 | A kind of fluid pressure type longeron assembly frock |
| CN108128713A (en) * | 2017-12-05 | 2018-06-08 | 淮阴工学院 | One kind is based on chaindriven combined type handling apparatus |
| CN108115049A (en) * | 2018-01-26 | 2018-06-05 | 无锡丰科金属制品有限公司 | A kind of Coil Coating Products roller type mold |
| CN209125188U (en) * | 2018-11-14 | 2019-07-19 | 浙江飞亚电梯有限公司 | Head frame welding platform |
Also Published As
| Publication number | Publication date |
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| CN109262177A (en) | 2019-01-25 |
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Inventor after: Zhu Junhua Inventor after: Bi Cheng Inventor after: Ni Chunlai Inventor after: Zhu Min Inventor after: Luo Weiliang Inventor before: Bi Cheng Inventor before: Ni Chunlai Inventor before: Zhu Junhua Inventor before: Zhu Min Inventor before: Luo Weiliang |