CN112374399A - Adjustable hoisting device for mechanical equipment maintenance - Google Patents
Adjustable hoisting device for mechanical equipment maintenance Download PDFInfo
- Publication number
- CN112374399A CN112374399A CN202011125427.6A CN202011125427A CN112374399A CN 112374399 A CN112374399 A CN 112374399A CN 202011125427 A CN202011125427 A CN 202011125427A CN 112374399 A CN112374399 A CN 112374399A
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- Prior art keywords
- mechanical equipment
- sliding
- equipment maintenance
- sliding sleeve
- equipment
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Links
- 238000012423 maintenance Methods 0.000 title claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 description 7
- 238000004804 winding Methods 0.000 description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C25/00—Cranes not provided for in groups B66C17/00 - B66C23/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C5/00—Base supporting structures with legs
Abstract
The invention discloses an adjustable hoisting device for maintaining mechanical equipment, which comprises a hook, a steel wire rope, a take-up and pay-off mechanism, a fixed cross beam, two pillars and two bearing mechanisms, wherein two ends of the fixed cross beam are respectively fixed at the top ends of the two pillars, the take-up and pay-off mechanism is installed in the middle of the fixed cross beam, the lower end of the steel wire rope is connected with the hook through a connecting disc, the upper end of the steel wire rope receives the pay-off mechanism, the hook is hung at the top of the mechanical equipment, the two bearing mechanisms respectively support two sides of the bottom of the mechanical equipment and are respectively in sliding connection with the two pillars, and each bearing mechanism is. According to the invention, the two sides of the mechanical equipment are symmetrically provided with the supporting mechanisms capable of synchronously lifting along with the equipment, and the equipment is connected with the two supporting columns of the hoisting device by using the two supporting mechanisms, so that the normal lifting of the mechanical equipment can be ensured, and the mechanical equipment can be prevented from shaking, thereby increasing the lifting stability of the equipment and improving the maintenance efficiency of the equipment.
Description
Technical Field
The invention relates to an adjustable hoisting device used for maintaining mechanical equipment, and belongs to the technical field of mechanical equipment.
Background
Mechanical equipment is various, and steel rolling equipment can be divided into the following products according to different rolled products: bar and wire mechanical equipment, plate and strip mechanical equipment, section mechanical equipment and pipe mechanical equipment; the process route and the application of the rolling can be divided into: the equipment comprises feeding equipment, heating equipment, rolling equipment, collecting equipment, finishing equipment, packaging equipment, shearing equipment, public and auxiliary equipment and the like. Along with the large-scale development of the mechanical industry, the use scale of mechanical equipment is larger and larger, and the mechanical equipment needs to be overhauled irregularly in the use process so as to ensure that the mechanical equipment can work normally.
When mechanical equipment is maintained, the adjustable lifting device is required to be lifted to a certain height so that the bottom of the adjustable lifting device can be overhauled. The existing adjustable hoisting device for maintenance mostly adopts a single hook to hoist mechanical equipment, so that the mechanical equipment is easy to shake when being hoisted, the stability is not high, the work efficiency of maintenance is affected, and the improvement of the mechanical equipment is needed.
Disclosure of Invention
The invention aims to provide an adjustable lifting device for maintaining mechanical equipment, aiming at overcoming the defects in the prior art, so as to prevent the mechanical equipment from shaking when being lifted and improve the maintenance work efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a hoisting apparatus with adjustable be used for mechanical equipment maintenance, includes couple, wire rope, receipts paying out machine structure, fixed cross beam, two pillars and two bearing mechanisms in the constitution, fixed cross beam's both ends are fixed respectively on two pillar tops, receive paying out machine structure and install at the fixed cross beam middle part, wire rope's lower extreme passes through the connection pad and is connected with the couple, and paying out machine structure is received to the upper end, the couple is hung at mechanical equipment's top, and two bearing mechanisms hold mechanical equipment bottom both sides respectively and respectively with two pillar sliding connection, and every bearing mechanism is connected with the connection pad through a haulage rope.
Above-mentioned hoisting apparatus with adjustable be used for mechanical equipment maintenance, bearing mechanism includes pneumatic cylinder, slip sleeve and bearing board subassembly, slip sleeve cover on the pillar and with pillar sliding connection, the pneumatic cylinder is fixed on the slip sleeve and is connected with the connection pad through the haulage rope, bearing board subassembly hold mechanical equipment bottom and with the piston rod fixed connection of pneumatic cylinder.
Above-mentioned hoisting apparatus with adjustable be used for mechanical equipment maintenance, the bearing board subassembly includes bottom plate, rubber pad board and buffer spring, the piston rod fixed connection of bottom plate and pneumatic cylinder, the rubber pad board is located the bottom plate top and holds the mechanical equipment bottom, is connected through buffer spring between rubber pad board and the bottom plate.
Above-mentioned hoisting apparatus with adjustable be used for mechanical equipment maintenance, be equipped with convex slider on sliding sleeve's the inner wall, seted up on the lateral wall of pillar with slider assorted vertical chute, sliding sleeve passes through slider and spout realization and the sliding connection of pillar.
According to the adjustable lifting device for mechanical equipment maintenance, 2-4 sliding blocks are arranged on the inner wall of each sliding sleeve and are uniformly distributed around the axis of each sliding sleeve.
Above-mentioned hoisting apparatus with adjustable be used for mechanical equipment maintenance, two bearing mechanism symmetries set up the both sides at mechanical equipment.
Above-mentioned hoisting apparatus with adjustable be used for mechanical equipment maintenance, receive and release line mechanism includes motor, pay off rack, pivot and a rolling section of thick bamboo, motor and pay off rack are fixed on fixed cross beam, the one end and the pay off rack of pivot rotate to be connected, the output shaft fixed connection of the other end and motor, the fixed cover of rolling section of thick bamboo is established in the pivot, and the outside winding wire rope of rolling section of thick bamboo is received.
According to the adjustable hoisting device for maintaining the mechanical equipment, the steel wire rope penetrates through the vertical through hole in the fixed cross beam.
According to the invention, the two sides of the mechanical equipment are symmetrically provided with the supporting mechanisms capable of synchronously lifting along with the equipment, and the equipment is connected with the two supporting columns of the hoisting device by using the two supporting mechanisms, so that the normal lifting of the mechanical equipment can be ensured, and the mechanical equipment can be prevented from shaking, thereby increasing the lifting stability of the equipment and improving the maintenance efficiency of the equipment.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a sliding sleeve;
figure 3 is a schematic diagram of a support plate assembly.
The reference numbers in the figures are: 1. fixing the cross beam; 2. a pillar; 3. a motor; 4. a pay-off rack; 5. a rotating shaft; 6. winding the roll; 7. a wire rope; 8. a through hole; 9. a connecting disc; 10. hooking; 11. a sliding sleeve; 12. a chute; 13. a hauling rope; 14. a first supporting mechanism; 15. a second supporting mechanism; 16. a support plate assembly; 17. a base plate; 18. a buffer spring; 19. a rubber pad; 20. a slider; 21. and a hydraulic cylinder.
Detailed Description
The invention provides an adjustable lifting device for maintaining mechanical equipment, which aims to solve the problem that the existing adjustable lifting device for maintaining the mechanical equipment is easy to cause the mechanical equipment to shake, so that the maintenance working efficiency is influenced.
As shown in fig. 1-3, the present invention includes a hook 10, a steel wire rope 7, a take-up and pay-off mechanism, a fixed beam 1, two pillars 2 and two supporting mechanisms (i.e. a first supporting mechanism 14 and a second supporting mechanism 15), the fixed beam 1 is fixedly mounted on the top end of the pillar 2, the take-up and pay-off mechanism is mounted on the upper end of the fixed beam 1, the steel wire rope 7 is wound on the take-up and pay-off mechanism, one end of the steel wire rope 7 penetrates through a through hole 8 formed in the fixed beam 1 and is connected with a connecting disc 9, the hook 10 is mounted on the bottom end of the connecting disc 9, two sides of the lower surface of the connecting disc 9 are both connected with traction ropes 13, two pillars 2 are provided, the two groups of pillars 2 are respectively provided with the first supporting mechanism 14 and the second supporting mechanism 15, the first supporting mechanism 14 and the second, The second supporting mechanism 15 is movably connected.
First supporting mechanism 14 is the same with the structure of second supporting mechanism 15, all includes pneumatic cylinder 21 and bearing board subassembly 16, the 11 fixed connection of sliding sleeve that are equipped with on pneumatic cylinder 21 and the pillar 2, the piston rod of pneumatic cylinder 21 and bearing board subassembly 16 fixed connection, when the first supporting mechanism 14 of haulage rope 13 pulling moves up, sliding sleeve 11 shifts up in step along spout 12 on the pillar 2, and drive pneumatic cylinder 21 and bearing board subassembly 16 and shift up, thereby can guarantee the stability that first supporting mechanism 14 moved up.
The bearing plate component 16 comprises a bottom plate 17 and a rubber cushion plate 19, the rubber cushion plate 19 is located above the bottom plate 17, a buffer spring 18 is installed between the rubber cushion plate 19 and the bottom plate 17, the rubber cushion plate 19 can increase the friction force of the bottom end of the mechanical device and the surface of the bearing plate component 16 in contact, sliding is prevented, meanwhile, the buffer spring 18 can buffer the pressure on the bearing plate component 16, and the phenomenon that the bearing plate component 16 is damaged due to sudden stress is avoided.
The protrusion is equipped with 2 ~ 4 sliders 20 on the 11 inner walls of sliding sleeve, slider 20's quantity is 4 in figure 2, set up the spout 12 that matches with 4 sliders 20 on the 2 lateral walls of pillar, sliding sleeve 11 passes through slider 20 and spout 12 and 2 sliding connection of pillar, can make sliding sleeve 11 pass through slider 20 and slide on pillar 2 along spout 12, thereby guarantee its stability that reciprocates, be convenient for improve first bearing mechanism 14, the stability that second bearing mechanism 15 reciprocated.
Receive paying out machine to construct including motor 3, pay off rack 4 and pivot 5, 5 rotations of pivot are installed on pay off rack 4, and motor 3's output shaft and 5 fixed connection of pivot, fixed cover are equipped with take-up reel 6 in the pivot 5, and wire rope 7 twines on take-up reel 6, can utilize motor 3 forward rotation or reverse rotation, drive pivot 5 to rotate to make take-up reel 6 rotate and carry out rolling or unwrapping wire work.
When the mechanical equipment to be lifted is positioned below the lifting device, firstly, the piston rods of the hydraulic cylinders 21 on the first supporting mechanism 14 and the second supporting mechanism 15 are extended out, the supporting plate component 16 is positioned at the bottom end of the mechanical equipment, then the hook 10 is connected with the upper end of the mechanical equipment, the motor 3 is started, the motor 3 rotates in the forward direction to drive the rotating shaft 5 to rotate, so that the winding drum 6 rotates synchronously to perform winding operation, the steel wire rope 7 pulls the mechanical equipment to move upwards, meanwhile, the traction rope 13 pulls the first supporting mechanism 14 and the second supporting mechanism 15 to move upwards synchronously, at the moment, the sliding block 20 in the sliding sleeve 11 moves upwards along the sliding groove 12 on the strut 2 synchronously, so that the stability of the first supporting mechanism 14 and the second supporting mechanism 15 moving upwards is ensured, when the mechanical equipment to be lifted is moved to a certain height, the motor 3 stops working, and a worker overhauls the lifted mechanical equipment, first bearing mechanism 14, second bearing mechanism 15 support mechanical equipment's bottom all the time, guarantee the stability that mechanical equipment hoisted to can guarantee the stability of the machinery of hanging when the maintenance, prevent to take place to rock, improve the security of maintenance work. The bearing plate component 16 is composed of a bottom plate 17 and a rubber cushion plate 19, a buffer spring 18 is arranged between the bottom plate 17 and the rubber cushion plate 19, the buffer spring 18 can be used for buffering the pressure of the bearing plate component 16, and meanwhile, the rubber cushion plate 19 can increase the friction force of the bottom of the mechanical component and the surface contact of the bearing plate component 16, so that the stability of the mechanical component is ensured. After the maintenance is finished, the motor 3 rotates reversely, the winding drum 6 carries out paying off, the mechanical equipment moves downwards, and meanwhile, the sliding sleeve 11, the first supporting mechanism 14 and the second supporting mechanism 15 synchronously move downwards, so that the mechanical equipment stably moves downwards. The invention has the advantages of simple structure, high stability, high safety and convenient use.
The invention has the following beneficial effects:
(1) according to the invention, the first bearing mechanism and the second bearing mechanism are respectively arranged on two sides of the mechanical equipment, the first bearing mechanism and the second bearing mechanism are connected with the two support columns in a sliding mode through the sliding sleeve, and the traction rope is fixedly connected with the first bearing mechanism and the second bearing mechanism.
(2) According to the invention, the sliding sleeve and the support column are in sliding connection through the sliding block and the sliding groove, so that the stability of the first bearing mechanism and the second bearing mechanism during lifting can be improved, and the shaking is prevented. The bearing plate component consists of a bottom plate and a rubber base plate, a buffer spring is arranged between the bottom plate and the rubber base plate, the buffer spring can be used for buffering the pressure received by the bearing plate component, and meanwhile, the rubber base plate can increase the friction force between the bottom of the mechanical component and the surface of the bearing plate component, so that the stability of the mechanical component is ensured.
Although embodiments of the present patent have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the present patent, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a hoisting apparatus with adjustable be used for mechanical equipment maintenance, characterized by includes couple (10), wire rope (7), receipts paying out machine structure, fixed cross beam (1), two pillar (2) and two bearing mechanism in the constitution, the both ends of fixed cross beam (1) are fixed respectively on two pillar (2) tops, receive paying out machine structure and install at fixed cross beam (1) middle part, the lower extreme of wire rope (7) passes through connection pad (9) and is connected with couple (10), and paying out machine structure is received to the upper end, couple (10) are hung at mechanical equipment's top, and two bearing mechanism hold mechanical equipment bottom both sides respectively and respectively with two pillar (2) sliding connection, and every bearing mechanism is connected with connection pad (9) through a haulage rope (13).
2. The adjustable lifting device for mechanical equipment maintenance is characterized in that the supporting mechanism comprises a hydraulic cylinder (21), a sliding sleeve (11) and a supporting plate component (16), the sliding sleeve (11) is sleeved on the support column (2) and is in sliding connection with the support column (2), the hydraulic cylinder (21) is fixed on the sliding sleeve (11) and is connected with the connecting plate (9) through a traction rope (13), and the supporting plate component (16) supports the bottom of the mechanical equipment and is fixedly connected with a piston rod of the hydraulic cylinder (21).
3. The adjustable lifting device for mechanical equipment maintenance according to claim 1 or 2, wherein the supporting plate assembly (16) comprises a bottom plate (17), a rubber cushion plate (19) and a buffer spring (18), the bottom plate (17) is fixedly connected with a piston rod of a hydraulic cylinder (21), the rubber cushion plate (19) is positioned above the bottom plate (17) and supports the bottom of the mechanical equipment, and the rubber cushion plate (19) is connected with the bottom plate (17) through the buffer spring (18).
4. The adjustable lifting device for mechanical equipment maintenance according to claim 3, wherein the inner wall of the sliding sleeve (11) is provided with a convex sliding block (20), the side wall of the pillar (2) is provided with a vertical sliding groove (12) matched with the sliding block (20), and the sliding sleeve (11) is in sliding connection with the pillar (2) through the sliding block (20) and the sliding groove (12).
5. Adjustable lifting device for mechanical equipment maintenance according to claim 4, characterized in that 2-4 sliding blocks (20) are arranged on the inner wall of each sliding sleeve (11), which are evenly distributed around the axis of the sliding sleeve (11).
6. The adjustable lifting device for mechanical equipment maintenance according to claim 5, wherein the two supporting mechanisms are symmetrically arranged on two sides of the mechanical equipment.
7. The adjustable hoisting device for mechanical equipment maintenance according to any one of claims 1 to 6, wherein the take-up and pay-off mechanism comprises a motor (3), a pay-off rack (4), a rotating shaft (5) and a take-up drum (6), the motor (3) and the pay-off rack (4) are fixed on the fixed cross beam (1), one end of the rotating shaft (5) is rotatably connected with the pay-off rack (4), the other end of the rotating shaft is fixedly connected with an output shaft of the motor (3), the take-up drum (6) is fixedly sleeved on the rotating shaft (5), and a steel wire rope (7) is wound outside the take-up drum (6).
8. Adjustable lifting device for mechanical equipment maintenance according to claim 7, characterized in that the wire rope (7) is passed through a vertical through hole (8) in the fixed beam (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011125427.6A CN112374399A (en) | 2020-10-20 | 2020-10-20 | Adjustable hoisting device for mechanical equipment maintenance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011125427.6A CN112374399A (en) | 2020-10-20 | 2020-10-20 | Adjustable hoisting device for mechanical equipment maintenance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112374399A true CN112374399A (en) | 2021-02-19 |
Family
ID=74581641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011125427.6A Pending CN112374399A (en) | 2020-10-20 | 2020-10-20 | Adjustable hoisting device for mechanical equipment maintenance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112374399A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113371605A (en) * | 2021-07-10 | 2021-09-10 | 广东百通人防工程防护设备有限公司 | Novel bridge crane |
| CN115611147A (en) * | 2022-09-06 | 2023-01-17 | 中铁城建集团第二工程有限公司 | Subway tunnel advertising light boxes travelling bogie |
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|---|---|---|---|---|
| CN208103745U (en) * | 2018-02-05 | 2018-11-16 | 河南省中冶起重机有限公司 | One kind is anti-to wave anticreep gantry crane system |
| CN208394671U (en) * | 2018-05-02 | 2019-01-18 | 泉州市康馨化工科技有限公司 | A kind of chemical equipment overhaul boom hoisting |
| CN208666937U (en) * | 2018-09-08 | 2019-03-29 | 李瑞静 | A kind of hoisting apparatus for industrial products |
| CN209668654U (en) * | 2019-01-15 | 2019-11-22 | 马鞍山利元实业有限公司 | A kind of hanging apparatus of forging |
| CN210313222U (en) * | 2019-07-17 | 2020-04-14 | 苏州市业鸿塑胶有限公司 | Traveling crane for installing refrigerator accessory die |
| CN210735914U (en) * | 2019-07-26 | 2020-06-12 | 上海振华港口机械（集团）龙昌起重设备（东台）有限公司 | Steel wire rope type elevator |
| CN211393590U (en) * | 2020-01-10 | 2020-09-01 | 郑州职业技术学院 | Lifting equipment for maintaining mechanical equipment |
-
2020
- 2020-10-20 CN CN202011125427.6A patent/CN112374399A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208103745U (en) * | 2018-02-05 | 2018-11-16 | 河南省中冶起重机有限公司 | One kind is anti-to wave anticreep gantry crane system |
| CN208394671U (en) * | 2018-05-02 | 2019-01-18 | 泉州市康馨化工科技有限公司 | A kind of chemical equipment overhaul boom hoisting |
| CN208666937U (en) * | 2018-09-08 | 2019-03-29 | 李瑞静 | A kind of hoisting apparatus for industrial products |
| CN209668654U (en) * | 2019-01-15 | 2019-11-22 | 马鞍山利元实业有限公司 | A kind of hanging apparatus of forging |
| CN210313222U (en) * | 2019-07-17 | 2020-04-14 | 苏州市业鸿塑胶有限公司 | Traveling crane for installing refrigerator accessory die |
| CN210735914U (en) * | 2019-07-26 | 2020-06-12 | 上海振华港口机械（集团）龙昌起重设备（东台）有限公司 | Steel wire rope type elevator |
| CN211393590U (en) * | 2020-01-10 | 2020-09-01 | 郑州职业技术学院 | Lifting equipment for maintaining mechanical equipment |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113371605A (en) * | 2021-07-10 | 2021-09-10 | 广东百通人防工程防护设备有限公司 | Novel bridge crane |
| CN115611147A (en) * | 2022-09-06 | 2023-01-17 | 中铁城建集团第二工程有限公司 | Subway tunnel advertising light boxes travelling bogie |
| CN115611147B (en) * | 2022-09-06 | 2023-10-20 | 中铁城建集团第二工程有限公司 | Subway tunnel advertising lamp box transportation trolley |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210219 |
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| RJ01 | Rejection of invention patent application after publication |