CN113666240B - Electromagnetic fixing system and floor dismantling and lifting method - Google Patents
Electromagnetic fixing system and floor dismantling and lifting method Download PDFInfo
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- CN113666240B CN113666240B CN202010416723.5A CN202010416723A CN113666240B CN 113666240 B CN113666240 B CN 113666240B CN 202010416723 A CN202010416723 A CN 202010416723A CN 113666240 B CN113666240 B CN 113666240B
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- electromagnetic
- traction
- pin shaft
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/62—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled
- B66C1/66—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled for engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
An electromagnetic fixing system for dismantling and lifting a floor and a floor dismantling and lifting method belong to the technical field of engineering dismantling. The lifting device comprises a fixed limiting device, a traction device, a top block, a connecting rod grapple, a lifting frame, an electromagnetic traction block, a pin shaft A and a pin shaft B, wherein the traction device is firmly fixed on a probe rod of the lifting frame under the combined action of the electrified electromagnetic traction block and the connecting rod grapple, the fixed limiting device and the traction device are firmly fixed together through a locking pin shaft, finally, an electromagnetic ring is electrified to generate strong magnetism to suck an adjustable suction nut, the locking pin shaft is prevented from loosening during working operation, after the installation of an electromagnetic fixing system is completed, workers are not required to operate around during the whole floor dismantling and lifting process, the degree of automation is high, the anti-falling protection function is provided, the floor of the whole dismantling and lifting operation cannot shake, and the working efficiency is remarkably improved.
Description
Technical Field
The invention relates to an electromagnetic fixing system and a floor dismantling and lifting method, and belongs to the technical field of engineering dismantling.
Background
At present, a large number of floor slab dismantling and lifting work links are needed in building dismantling (especially high-rise building), and in general, a method of cutting, punching and fixing and then lifting steel wires is mainly adopted, but the method is low in efficiency, needs more manpower and is easy to cause accidents.
Devices exist in the prior art for use in securing and handling floors. The invention patent numbers 20181144388.7 and 201811443825.5 disclose two fixing systems and a floor dismantling and lifting method, which solve the problems that a steel wire rope is easy to wear and lifting stability is difficult to control in the dismantling process of the floor. But when using these two kinds of spacing subassembly hoist and mount floor, first horizontal support both ends are articulated, and the during operation easily appears rotating unstable condition and floor and rocks the condition, and need the workman to operate by side all the time, and complex operation, degree of automation is low, inefficiency.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an electromagnetic fixing system and a floor dismantling and lifting method, which realize the dismantling and lifting operation of the floor.
The invention is realized by the following technical scheme. The electromagnetic fixing system comprises a fixing limiting device, a traction device, a top block, a connecting rod grapple, a lifting frame, an electromagnetic traction block, a pin shaft A and a pin shaft B, wherein the electromagnetic traction block is fixed on the lifting frame, the middle of the connecting rod grapple is hinged with the lifting frame through the pin shaft A, the top block is inserted into the lifting frame and the electromagnetic traction block, the pin shaft B is fixed on the top block and forms high-pair connection with the connecting rod grapple, the upper end of the traction device is sucked with the electromagnetic traction block, and the fixing limiting device is matched with the traction device.
The traction device consists of an introduction electromagnet, a locking pin shaft, a traction block, an adjustable attraction nut, an electromagnetic ring and a set screw, wherein the introduction electromagnet is fixed on the traction block, the electromagnetic ring is fixed on the traction block, the locking pin shaft is inserted into the traction block from a small-diameter end and protrudes out of the traction block, and the adjustable attraction nut is fixed at the protruding end of the locking pin shaft through the set screw.
Preferably, the number of the lead-in electromagnets is two or more.
The locking pin shaft is provided with a positioning shaft shoulder.
The traction block is provided with a locking pin shaft hole, a positioning hole shoulder is arranged in the middle of the locking pin shaft hole, the bottommost end of the traction block is provided with an electromagnet installation hole, a positioning groove is arranged between the electromagnet installation holes, the other end of the traction block is provided with an annular electromagnetic ring installation hole, and the uppermost end of the traction block is provided with a traction guiding oblique side.
Two pin shaft holes B are formed in the top block.
The connecting rod grapple is of a symmetrical structure, a pin shaft guide groove and a pin shaft hole are respectively formed in the left and the right, and a locking grapple is arranged at the bottommost end and used for grabbing the traction device.
The lifting frame body is an annular framework, lifting lugs are arranged on the annular framework, probe rods are uniformly arranged on the outer side of the annular framework, a top block opening and a traction block opening are formed in each probe rod, pin shaft seats are respectively arranged on two sides of each probe rod, and chamfers are respectively arranged at two ends of each pin shaft seat.
Preferably, the number of the lifting lugs is three or more.
Preferably, the number of the probe rods is three or more.
The middle of the electromagnetic traction block is provided with a through top block perforation.
The middle of the floor slab to be dismantled is provided with an outline hole with the size slightly larger than that of the fixed limiting device.
The invention has the advantages that: the electromagnetic traction block is electrified to generate strong magnetism, the traction device is sucked and simultaneously drives the connecting rod grapple to rotate around the pin shaft A and hook the lower side of the traction block, and at the moment, the traction device is firmly fixed on the probe rod which plays a role of a hanger under the combined action of the electrified electromagnetic traction block and the connecting rod grapple; and then sleeving the fixed limiting device on the limiting device, sucking the fixed limiting device and the traction block tightly by the leading-in electromagnet, pushing the locking pin shaft and the adjustable suction nut back into the traction block, firmly fixing the fixed limiting device and the traction device together through the locking pin shaft, and finally electrifying the electromagnetic ring to generate strong magnetism to suck the adjustable suction nut so as to prevent the locking pin shaft from loosening during working operation.
According to the electromagnetic fixing system and the floor dismantling and lifting method, after the electromagnetic fixing system is installed, workers do not need to operate around, potential safety hazards of personnel are avoided, the whole floor dismantling and lifting process is high in automation degree, the anti-falling protection function is achieved, the floor can not shake during the whole dismantling and lifting operation, and the operation efficiency is remarkably improved.
Drawings
Fig. 1 is a schematic view of the structure of the electromagnetic fastening system of the present invention in an operative combination state.
Fig. 2 is a partial enlarged view of a in fig. 1.
Fig. 3 is a schematic structural view of the electromagnetic fastening system of the present invention in a pre-operation separated state.
Fig. 4 is a schematic view of the structure of the traction device of the electromagnetic fixing system according to the present invention in a locked state.
Fig. 5 is a schematic view of the structure of the electromagnetic fixing system of the present invention in an unlocked state.
Fig. 6 is a schematic structural view of a locking pin of the electromagnetic fastening system of the present invention.
Fig. 7 is a structural cross-sectional view of a traction block of the electromagnetic fastening system of the present invention.
Fig. 8 is a schematic structural view of a top block of the electromagnetic fixing system of the present invention.
Fig. 9 is a schematic view of the structure of the link grapple of the electromagnetic fixing system of the present invention.
Fig. 10 is a schematic structural view of a lifting frame of the electromagnetic fixing system of the present invention.
Fig. 11 is a partial enlarged view of B in fig. 10.
Fig. 12 is a schematic structural view of an electromagnetic traction block of the electromagnetic fastening system of the present invention.
Fig. 13 is a schematic view of a process of inserting an electromagnetic fixing system into a floor to be removed in the floor removing and lifting method according to the embodiment of the invention.
Fig. 14 is a schematic diagram of a process of lifting an electromagnetic fixing system floor in a floor removing and lifting method according to an embodiment of the invention.
In the figure, 1, a fixed limiting device 2, a traction device 3, a top block 4, a connecting rod grapple 5, a lifting frame 6, an electromagnetic traction block 7, a pin A8, a pin B9, a floor slab 10 to be dismantled, a lifting steel wire rope 21, an imported electromagnet 22, a locking pin 23, a traction block 24, an adjustable suction nut 25, an electromagnetic ring 26, a set screw 221, a positioning shaft shoulder 231, a locking pin shaft hole 232, an imported electromagnet mounting hole 233, a positioning groove 234, an electromagnetic ring mounting hole 235, a positioning hole shoulder 236, a traction imported bevel edge 31, a pin hole B41, a pin guide groove 42, a pin hole A43, a locking grapple 51, an annular skeleton 52, a lifting lug 53, a probe rod 54, a top block opening 55, a traction block opening 56, a chamfer 57, a pin seat 61, a top block perforation 91, a hole
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
In the description of the present invention, it should be understood that the terms "upper," "lower," "intermediate," "upper," "middle," "inner," "end," "other end," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "hinged," "mounted," "secured," "inserted," "sleeved," "disposed," "opened," "mated," and the like are to be construed broadly and may be fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, fig. 2 and fig. 3, the electromagnetic fixing system comprises a fixing and limiting device 1, a traction device 2, a top block 3, a connecting rod grapple 4, a lifting frame 5, an electromagnetic traction block 6, a pin shaft A7 and a pin shaft B8, wherein the electromagnetic traction block 6 is firstly fixed in a probe rod 53 of the lifting frame 5, the middle of the connecting rod grapple 4 is hinged with the lifting frame 5 through the pin shaft A7, then the top block 3 is inserted into the lifting frame 5 and the electromagnetic traction block 6, the pin shaft B8 fixed on the top block 3 is simultaneously inserted into the connecting rod grapple 4 to form high-pair connection, the upper end of the traction device 2 is sucked together by the electromagnetic traction block 6, and the fixing and limiting device 1 is matched with the traction device 2.
The traction device 2 shown in fig. 4 and 5 is composed of an introducing electromagnet 21, a locking pin 22, a traction block 23, an adjustable attraction nut 24, an electromagnetic ring 25 and a set screw 26, wherein the two introducing electromagnets 21 are respectively fixed in an introducing electromagnet mounting hole 232 on the traction block 23, the electromagnetic ring 25 is fixed in an annular electromagnetic ring mounting hole 234 of the traction block 23, the locking pin 22 is inserted into a locking pin hole 231 of the traction block 23 from a small diameter end and protrudes out of the traction block 23, finally the adjustable attraction nut 24 is fixed at the protruding end of the locking pin 22 through the set screw 26, and the position of the adjustable attraction nut 24 on the locking pin 22 can be adjusted according to the use condition.
A locating shoulder 221 is provided on the locking pin 22 as shown in fig. 6.
As shown in fig. 7, a locking pin shaft hole 231 is formed on the traction block 23, a positioning hole shoulder 235 is arranged in the middle of the locking pin shaft hole 231, two guiding-in electromagnet mounting holes 232 are formed at the bottommost end of the traction block 23, a positioning groove 233 is formed between the two guiding-in electromagnet mounting holes 232, an annular electromagnetic ring mounting hole 234 is formed at the other end of the traction block 23, and a traction guiding-in inclined edge 236 which is convenient for guiding the traction block 23 into the lifting frame 5 is formed at the uppermost end.
Two pin holes B31 are formed in the top block 3 as shown in FIG. 8.
As shown in fig. 9, the connecting rod grapple 4 has a symmetrical structure, a pin guiding slot 41 and a pin hole 42 are respectively formed at the left and right sides, and a locking grapple 43 is disposed at the lowest end for hooking the traction device 2.
As shown in fig. 10 and 11, the main body of the lifting frame 5 is an annular framework 51, three lifting lugs 52 are arranged on the annular framework 51 and used for lifting operation of the whole system, three probe rods 53 are uniformly arranged on the outer side of the annular framework 51, a top block opening 54 and a traction block opening 55 are formed in each probe rod 53, pin shaft seats 57 are respectively arranged on two sides of each probe rod 53, and a chamfer 56 is respectively arranged on two ends of each pin shaft seat 57 to prevent interference and collision between the connecting rod grapple 4 and the probe rod 53.
A through top block through hole 61 is provided in the middle of the electromagnetic traction block 6 as shown in fig. 12.
When the electromagnetic traction device is used, the traction device 2 is firstly inserted into the traction block opening 55 of the probe rod 53 on the lifting frame 5, the jacking block 3 is at a lower position due to self weight, the electromagnetic traction block 6 is electrified to generate strong magnetism under the control of an operator, the traction device 2 is sucked upwards, meanwhile, the jacking block 3 is jacked upwards by the traction device 2, the connecting rod grapple 4 is driven to rotate around the pin shaft A7 and hook the lower side of the traction block 23, and the traction device 2 is firmly fixed on the probe rod 53 of the lifting frame 5 under the combined action of the electrified electromagnetic traction block 6 and the connecting rod grapple 4.
The locking pin 22 on the traction device 2 is pulled out to an unlocking state shown in fig. 5, then the fixed limiting device 1 is sleeved on the limiting device, the fixed limiting device 1 and the traction block 23 are sucked tightly by the leading-in electromagnet 21, the locking pin 22 and the adjustable suction nut 24 are pushed back into the traction block 23, the fixed limiting device 1 and the traction device 2 are firmly fixed together through the locking pin 22, finally an operator controls the electromagnet ring 25 to electrify to generate strong magnetism to suck the adjustable suction nut 24, and the locking pin 22 is prevented from loosening when working.
The electromagnetic fixing system is not only suitable for dismantling and fixing the structural floor slab, but also suitable for dismantling other perforating and penetrating structures.
According to the embodiment of the invention, the invention provides a method for dismantling and lifting a floor by adopting the electromagnetic fixing system, as shown in fig. 13, which is a schematic diagram of a process of inserting the electromagnetic fixing system into a floor 9 to be dismantled in the method for dismantling and lifting the floor, as shown in fig. 14, which is a schematic diagram of a process of lifting the floor 9 to be dismantled by using the electromagnetic fixing system in the method for dismantling and lifting the floor, wherein a hole 91 slightly larger than the outer contour dimension of a shell is formed in the middle of the floor 9 to be dismantled.
The method comprises the following steps:
1. the floor 9 to be dismantled is provided with corresponding holes 91, and the size of the holes 91 is slightly larger than the outer contour size of the fixed limiting device 1.
2. The electromagnetic fixing system is assembled, and the traction device 2 and the fixed limiting device 1 are assembled in sequence, so that the electromagnetic fixing system is assembled into a combined state during working from a separation state before working.
3. The initial state fixing and limiting device 1 is in a non-working state, and the electromagnetic fixing system is lifted to the position above the floor 9 to be dismantled through the steel wire rope 10.
4. Aligned with the hole 91 of the floor 9 to be removed, the electromagnetic fixing system is inserted downwards into the hole 91 of the floor 9 to be removed.
5. The starting motor changes the fixed limiting device 1 from a non-working state to a working state.
6. Lifting by the steel wire rope 10 to enable the electromagnetic fixing system to ascend, lifting the floor 9 to be dismantled, and completing the floor dismantling and lifting operation.
7. After the lifting operation is finished, the operation fixing and limiting device 1 is changed from a working state to a non-working state, and the electromagnetic fixing system can be pulled out from the hole 91 of the floor 9 to be removed.
Alterations, modifications, substitutions and variations of the embodiments herein will be apparent to those of ordinary skill in the art in light of the teachings of the present invention without departing from the spirit and principles of the invention.
Claims (10)
1. The utility model provides an electromagnetic fixing system, includes fixed stop device (1), draw gear (2), kicking block (3), connecting rod grapple (4), lifting frame (5), electromagnetism traction block (6), round pin axle A (7) and round pin axle B (8), its characterized in that: the electromagnetic traction block (6) is fixed on the lifting frame (5), the middle of the connecting rod grapple (4) is hinged with the lifting frame (5) through a pin shaft A (7), the top block (3) is inserted into the lifting frame (5) and the electromagnetic traction block (6), the pin shaft B (8) is fixed on the top block (3) and forms high-pair connection with the connecting rod grapple (4), the upper end of the traction device (2) is sucked with the electromagnetic traction block (6), and the fixed limiting device (1) is matched with the traction device (2).
2. The electromagnetic fastening system of claim 1, wherein: the traction device (2) consists of an introduction electromagnet (21), a locking pin shaft (22), a traction block (23), an adjustable attraction nut (24), an electromagnetic ring (25) and a set screw (26), wherein the introduction electromagnet (21) is fixed on the traction block (23), the electromagnetic ring (25) is fixed on the traction block (23), the locking pin shaft (22) is inserted into the traction block (23) from a small-diameter end and protrudes out of the traction block (23), and the adjustable attraction nut (24) is fixed at the protruding end of the locking pin shaft (22) through the set screw (26).
3. The electromagnetic fastening system of claim 2, wherein: the adjustable suction nut (24) can be adjusted to the position on the locking pin shaft (22).
4. The electromagnetic fastening system of claim 2, wherein: a locking pin shaft hole (231) is formed in the traction block (23), a positioning hole shoulder (235) is arranged in the middle of the locking pin shaft hole (231), an electromagnet installation hole (232) is formed in the bottommost end of the traction block (23), a positioning groove (233) is formed between the electromagnet installation holes (232), an annular electromagnet ring installation hole (234) is formed in the other end of the traction block (23), and a traction guiding oblique side (236) is formed in the uppermost end of the traction block.
5. The electromagnetic fastening system of claim 1, wherein: the top block (3) is provided with a pin shaft hole B (31).
6. The electromagnetic fastening system of claim 1, wherein: the connecting rod grapple (4) is of a symmetrical structure, a pin shaft guide groove (41) and a pin shaft hole (42) are respectively formed in the left and right sides, and a locking grapple (43) is arranged at the lowest end.
7. The electromagnetic fastening system of claim 1, wherein: the lifting frame (5) body is an annular framework (51), lifting lugs (52) are arranged on the annular framework (51), probe rods (53) are uniformly arranged on the outer side of the annular framework (51), top block openings (54) and traction block openings (55) are formed in each probe rod (53), pin shaft seats (57) are respectively arranged on two sides of each probe rod (53), and chamfer angles (56) are respectively arranged at two ends of each pin shaft seat (57).
8. The electromagnetic fastening system of claim 7, wherein: the number of the probe rods (53) is three or more.
9. The electromagnetic fastening system of claim 1, wherein: a through top block perforation (61) is arranged in the middle of the electromagnetic traction block (6).
10. A method of floor slab demolishing and lifting using the electromagnetic fixing system of any of claims 1-9, comprising:
corresponding holes (91) are formed in the floor (9) to be dismantled, and the size of the holes (91) formed in the floor (9) to be dismantled is slightly larger than the outer contour size of the fixed limiting device (1);
assembling an electromagnetic fixing system, and sequentially assembling a traction device (2) and a fixing and limiting device (1);
inserting the electromagnetic fixing system into the hole (91) of the floor slab (9) to be dismantled;
the fixed limiting device (1) is operated to change from a non-working state to a working state, and is used for supporting the floor (9) to be dismantled and preventing the floor (9) to be dismantled from falling;
lifting through a steel wire rope (10), lifting the electromagnetic fixing system, lifting the floor (9) to be dismantled, and completing the floor dismantling and lifting operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010416723.5A CN113666240B (en) | 2020-05-15 | 2020-05-15 | Electromagnetic fixing system and floor dismantling and lifting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010416723.5A CN113666240B (en) | 2020-05-15 | 2020-05-15 | Electromagnetic fixing system and floor dismantling and lifting method |
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| Publication Number | Publication Date |
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| CN113666240A CN113666240A (en) | 2021-11-19 |
| CN113666240B true CN113666240B (en) | 2023-07-18 |
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| CN202010416723.5A Active CN113666240B (en) | 2020-05-15 | 2020-05-15 | Electromagnetic fixing system and floor dismantling and lifting method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0986454A (en) * | 1995-09-20 | 1997-03-31 | Mitsubishi Motors Corp | Connecting device for semi-tractor |
| FR2754805A1 (en) * | 1996-10-18 | 1998-04-24 | Soderel | Lifting hook with opening secured electromagnetically |
| FR2835515A1 (en) * | 2002-02-04 | 2003-08-08 | Bennes Sepere | Articulate hydraulic swing bar, for surface treating of buildings, has central bar with hydraulic arms to carry support cables for platforms |
| CN204434066U (en) * | 2014-12-12 | 2015-07-01 | 吴俊豪 | Card-type overhead hoist in automobile brake drum |
| CN106348148A (en) * | 2016-11-01 | 2017-01-25 | 上海中远川崎重工钢结构有限公司 | Permanently magnetic lifting appliance |
| CN109368479A (en) * | 2018-11-29 | 2019-02-22 | 上海建工四建集团有限公司 | Fixed system and floor remove handling method |
-
2020
- 2020-05-15 CN CN202010416723.5A patent/CN113666240B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0986454A (en) * | 1995-09-20 | 1997-03-31 | Mitsubishi Motors Corp | Connecting device for semi-tractor |
| FR2754805A1 (en) * | 1996-10-18 | 1998-04-24 | Soderel | Lifting hook with opening secured electromagnetically |
| FR2835515A1 (en) * | 2002-02-04 | 2003-08-08 | Bennes Sepere | Articulate hydraulic swing bar, for surface treating of buildings, has central bar with hydraulic arms to carry support cables for platforms |
| CN204434066U (en) * | 2014-12-12 | 2015-07-01 | 吴俊豪 | Card-type overhead hoist in automobile brake drum |
| CN106348148A (en) * | 2016-11-01 | 2017-01-25 | 上海中远川崎重工钢结构有限公司 | Permanently magnetic lifting appliance |
| CN109368479A (en) * | 2018-11-29 | 2019-02-22 | 上海建工四建集团有限公司 | Fixed system and floor remove handling method |
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| Publication number | Publication date |
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| CN113666240A (en) | 2021-11-19 |
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