CN115123922A - Safe and stable's lifting devices for building engineering - Google Patents
Safe and stable's lifting devices for building engineering Download PDFInfo
- Publication number
- CN115123922A CN115123922A CN202210802652.1A CN202210802652A CN115123922A CN 115123922 A CN115123922 A CN 115123922A CN 202210802652 A CN202210802652 A CN 202210802652A CN 115123922 A CN115123922 A CN 115123922A
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- Prior art keywords
- safe
- triangular support
- hoisting
- wheel
- fixed
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Classifications
-
- 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
- B66C5/02—Fixed or travelling bridges or gantries, i.e. elongated structures of inverted L or of inverted U shape or tripods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C11/00—Trolleys or crabs, e.g. operating above runways
- B66C11/16—Rope, cable, or chain drives for trolleys; Combinations of such drives with hoisting gear
- B66C11/24—Rope, cable, or chain drives for trolleys; Combinations of such drives with hoisting gear with means for locating or sustaining the loads or trolleys in predetermined positions; Hay hoists
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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
- 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
- B66C13/00—Other constructional features or details
- B66C13/16—Applications of indicating, registering, or weighing devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C19/00—Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Types And Forms Of Lifts (AREA)
Abstract
The invention discloses safe and stable hoisting equipment for construction engineering, which comprises: two symmetrically arranged triangular support frames; the telescopic inner pipe is arranged above the triangular support frame in a vertically sliding manner; the fixed end of the adjusting cylinder is hinged to the side of the triangular support frame, and the output end of the adjusting cylinder is hinged to the side of the telescopic inner pipe; the I-shaped steel guide rail is fixed above the two telescopic inner pipes; the power box is arranged on the I-shaped steel guide rail in a manner that the four driving wheels below the power box can move left and right, and is provided with two lifting ends capable of being lifted independently, and the two lifting ends are connected with the hoisting assembly through a steel wire rope.
Description
Technical Field
The invention relates to the field of engineering lifting, in particular to safe and stable lifting equipment for constructional engineering.
Background
With the continuous improvement of the social level of people, the requirements of people on the building are continuously increased, a large amount of building materials are needed in the building construction process, the carrying of the building materials is extremely inconvenient, and the lifting carrying equipment becomes one of indispensable auxiliary equipment in the building industry.
In the hoisting operation engineering, the shapes of some building materials are not very standard, the gravity center is difficult to determine by using conventional hoisting equipment, the building materials are easily inclined and slide off under the influence of wind power in the hoisting and carrying process, the normal construction progress is influenced by falling of objects, and constructors are easily injured by heavy persons.
Therefore, there is a need to develop a safe and stable lifting apparatus to solve the above problems.
Disclosure of Invention
In order to achieve the above object, the present invention provides a safe and stable lifting device for construction engineering, comprising:
two symmetrically arranged triangular support frames;
the telescopic inner pipe is arranged above the triangular support frame in a vertically sliding manner;
the fixed end of the adjusting cylinder is hinged to the side of the triangular support frame, and the output end of the adjusting cylinder is hinged to the side of the telescopic inner pipe;
the I-shaped steel guide rail is fixed above the two telescopic inner pipes; and
the power box is arranged on the I-shaped steel guide rail in a manner that four driving wheels below the power box can move left and right, the power box is provided with two lifting ends capable of being lifted independently, and the two lifting ends are connected with a hoisting assembly through a steel wire rope.
Preferably, the triangular support frame is a triangular support formed by connecting rectangular pipe profiles and used for supporting the hoisting equipment, two ends below the triangular support frame are symmetrically provided with a forward wheel and a ground grabbing adjuster, the forward wheel is rotatably arranged below the triangular support frame, the ground grabbing adjuster is fixed on the outer side of the forward wheel, and the ground grabbing adjuster is used for finely adjusting the height of the supporting legs of the triangular support frame through threaded transmission to ensure that the hoisting equipment is stably fixed on a working place.
Further, preferably, the power box includes:
the box body is movably arranged above the I-shaped steel guide rail through the driving wheel, and the interior of the box body can be divided into two cavities;
the motor is fixed on the outer side of the box body;
two synchronizing wheels are symmetrically arranged and rotatably mounted in the cavity close to one side of the motor, and one of the synchronizing wheels is directly connected with the motor;
the synchronous belt is connected with the synchronous wheel in a transmission way, and an adjusting bracket fixed on the inner wall of the box body is arranged above the synchronous belt;
the adjusting wheel is arranged in the adjusting bracket in a sliding manner through an adjusting knob and is used for adjusting the matching of the synchronous wheel belt; and
the self-locking winch is fixed in the cavity far away from one side of the motor and is in transmission connection with the synchronizing wheel through a transmission assembly.
Further, as preferred, the wire rope is coiled inside the self-locking winch, and self-locking can be carried out in the working process, so that the heavy object is prevented from falling.
Further, preferably, the transmission assembly includes:
the first friction disc is connected with the synchronous wheel through a first transmission shaft;
one end of the transmission shaft II is connected with the input end of the self-locking winch, and the other end of the transmission shaft II is provided with a friction disc II in a sliding manner; and
and the spring is arranged between the first friction disk and the second friction disk, sleeved on the outer wall of the second transmission shaft and fixed on one end face of the friction disk.
Preferably, a sliding key is arranged on the surface of the transmission shaft, and a sliding groove is formed in the central inner hole of the friction disc.
Preferably, the electromagnet is arranged in the second friction disc, the first friction disc and the two end faces of the friction disc are both subjected to knurling treatment, and the end face patterns can be meshed with each other.
Further, as preferred, the hoist assembly includes:
the hoisting plate is hinged with the steel wire rope, and a molded sliding groove is arranged in the hoisting plate;
the two sliding blocks are arranged in the type sliding groove in a sliding manner;
the fixed end of the thrust rod is hinged to the side wall of the hoisting plate, and the telescopic end of the thrust rod is hinged to the side wall of the sliding block and used for driving the sliding block to move; and
and the lifting hook is rotatably arranged below the sliding block and is matched with the hanging strip to lift a heavy object.
Further, as preferred, the hoisting plate is internally provided with a balance inductor, so that the inclination condition in the hoisting process can be monitored conveniently.
Compared with the prior art, the invention provides safe and stable hoisting equipment for construction engineering, which has the following beneficial effects:
in the invention, the position of the lifting hook is adjusted to be matched with the hanging strip to fix the weight, so that the direction of the lifting force is positioned on a plumb line of the gravity center of the weight, the balance inductor constantly monitors whether the weight inclines or not in the lifting process,
according to the invention, if the lifted weight is inclined, the balance of the weight is automatically adjusted, the sliding of the friction disc II on the transmission shaft II is controlled through the magnetic flux and demagnetization of the friction disc II, so that the meshing condition of the friction disc II and the friction disc I is influenced, whether the self-locking winch is started at a given speed is controlled, the lifting resultant force direction of the adjusting device is positioned on a plumb line of the gravity center of the weight at any time, and the rollover caused by unstable gravity center of the lifted weight is effectively prevented.
Drawings
FIG. 1 is a schematic view of the overall structure of a safe and stable hoisting device for construction engineering;
FIG. 2 is a schematic structural diagram of a safe and stable triangular support frame in a hoisting device for construction engineering;
FIG. 3 is a schematic structural diagram of a power box of a safe and stable hoisting device for construction engineering;
FIG. 4 is a schematic structural diagram of a transmission assembly of the hoisting equipment for construction engineering, which is safe and stable;
FIG. 5 is a schematic structural diagram of a hoisting assembly in a safe and stable hoisting device for construction engineering
In the figure: 1. a wire rope; 2. a drive wheel; 3. a power box; 31. a box body; 32. a motor; 33. an adjustment wheel; 34. adjusting a knob; 35. adjusting the bracket; 36. a synchronous belt; 37. a synchronizing wheel; 38. a transmission assembly; 381. a first transmission shaft; 382. a first friction disc; 383. a second friction disc; 384. a spring; 385. a second transmission shaft; 39. a self-locking capstan; 4. hoisting the assembly; 41. hoisting the plate; 42. a thrust rod; 43. a hook; 44. a slider; 5. an inner tube is telescopic; 6. a triangular support frame; 61. a grip adjuster; 62. a forward wheel; 7. an adjusting cylinder; 8. i-shaped steel rail.
Detailed Description
Referring to fig. 1 to 5, the present invention provides a safe and stable lifting apparatus for construction engineering, comprising:
two symmetrically arranged triangular support frames 6;
the telescopic inner pipe 5 is arranged above the triangular support frame 6 in a vertically sliding manner;
the fixed end of the adjusting cylinder 7 is hinged to the side of the triangular support frame 6, and the output end of the adjusting cylinder is hinged to the side of the telescopic inner pipe 5;
the I-shaped steel guide rail 8 is fixed above the two telescopic inner pipes 5; and
the power box 3 is arranged on the I-shaped steel guide rail 8 in a manner that the four driving wheels 2 below the power box can move left and right, the power box 3 is provided with two lifting ends capable of being independently lifted, and the two lifting ends are connected with the hoisting assembly 4 through the steel wire rope 1.
In the construction process, especially in the construction site with limited space, large hoisting equipment is difficult to operate due to height limitation, and the hoisting equipment can reduce the overall height of the hoisting equipment through the contraction of the adjusting cylinder 7, so that heavy objects can be hoisted and carried conveniently.
In this embodiment, as shown in fig. 2, the triangular support frame 6 is a triangular support frame formed by connecting rectangular pipe sections, and is used for supporting the hoisting equipment, and two ends of the lower part of the triangular support frame are symmetrically provided with a forward wheel 62 and a ground-grasping adjuster 61, wherein the forward wheel 62 is rotatably arranged below the triangular support frame 6, the ground-grasping adjuster 61 is fixed on the outer side of the forward wheel 62, and the ground-grasping adjuster 61 finely adjusts the height of the support leg of the triangular support frame 6 through screw transmission, so as to ensure that the hoisting equipment is stably fixed on a working site.
In this embodiment, as shown in fig. 3, the power box 3 includes:
the box body 31 is movably arranged above the I-shaped steel guide rail 8 through the driving wheel 2, and the interior of the box body 31 can be divided into two cavities;
a motor 32 fixed to the outside of the case 31;
two synchronous wheels 37 are symmetrically arranged and rotatably installed in the cavity close to one side of the motor 32, wherein one synchronous wheel 37 is directly connected with the motor 32;
the synchronous belt 36 is in transmission connection with the synchronous wheel 37, and an adjusting bracket 35 fixed on the inner wall of the box body 31 is arranged above the synchronous belt 36;
the adjusting wheel 33 is arranged inside the adjusting bracket 35 in a sliding manner through an adjusting knob 34 and is used for adjusting the matching of the synchronous belt; and
the self-locking winch 39 is fixed inside the cavity on the side far away from the motor 32 and is in transmission connection with the synchronizing wheel 37 through a transmission assembly 38.
In this embodiment, the self-locking winch 39 is internally wound around the steel wire rope 1, and can perform self-locking in the working process to prevent a heavy object from falling.
In this embodiment, as shown in fig. 4, the transmission assembly 38 includes:
a first friction disc 382 connected with the synchronizing wheel 37 through a first transmission shaft 381;
one end of the second transmission shaft 385 is connected with the input end of the self-locking winch 39, and the other end of the second transmission shaft is slidably provided with a second friction disc 383; and
and the spring 384 is arranged between the first friction disk 382 and the second friction disk 383, sleeved on the outer wall of the second transmission shaft 385 and fixed on the end surface of the first friction disk 382.
In this embodiment, as shown in fig. 4, a sliding key is provided on the surface of the second transmission shaft 385, and a sliding groove is provided in the central inner hole of the second friction disc 383.
In this embodiment, as shown in fig. 4, an electromagnet is disposed inside the second friction disk 383, and the end surfaces of the first friction disk 382 and the second friction disk 383 are both knurled, so that the end surface patterns can be engaged with each other.
When the second friction disc 383 is energized, the second friction disc 383 can slide on the second transmission shaft 385 to be close to the first friction disc 382 and be meshed with the first friction disc 382, and power is transmitted to the self-locking winch 39;
when the second friction disc 383 is demagnetized, the second friction disc 383 slides on the second transmission shaft 385 under the action of the spring 384 to be far away from the first friction disc 382, and the self-locking winch 39 loses power and performs self-locking to prevent a lifted heavy object from falling.
In this embodiment, as shown in fig. 5, the hoisting assembly 4 includes:
the hoisting plate 41 is hinged with the steel wire rope 1, and a T-shaped sliding groove is formed in the hoisting plate;
the two sliding blocks 44 are arranged in the T-shaped sliding grooves in a sliding mode;
a thrust rod 42, the fixed end of which is hinged to the side wall of the hoisting plate 41, and the telescopic end of which is hinged to the side wall of the slide block 44, for driving the slide block 44 to move; and
and the lifting hook 43 is rotatably arranged below the sliding block 44 and is matched with a hanging strip to lift a heavy object.
In actual work, the gravity center of a heavy object to be lifted may be offset, the heavy object to be lifted may be turned over when the heavy object is directly lifted, and at this time, the position of the lifting hook is adjusted by starting the thrust rod 42, and the heavy object is fixed by matching with the hanging strip, so that the direction of the lifting force is on a plumb line of the gravity center of the heavy object.
In this embodiment, the hoisting plate 41 is internally provided with a balance sensor, which is convenient for monitoring the inclination condition in the hoisting process.
In the hoisting process, the weight can be inclined due to wind power or other factors, the balance inductor judges and transmits a signal to the power box for automatic adjustment, and the balance of the weight is kept constantly.
During adjustment: the inclined side of the weight is lifted normally, the friction disc two 383 on the other side is demagnetized, the friction disc two 383 is separated from the friction disc one 382 under the action of the spring 384, the lifting of the self-locking winch 39 is stopped, the self-locking winch 39 is locked, the friction disc two 383 is magnetized after the weight is stably balanced, the separated friction disc two 383 and the friction disc one 382 are re-meshed, the weight is lifted together, the lifting resultant force direction of the equipment is constantly adjusted to be located on a plumb line of the gravity center of the weight by controlling the working condition of the self-locking winch 39, and the side turning caused by the unstable gravity center of the lifted weight can be effectively prevented.
When embodied in practice
And S1, the lifting equipment reduces the overall height of the equipment through the telescopic contraction of the adjusting cylinder 7, enters a site for operation, and is placed in a designated working site, and the ground adjuster 61 finely adjusts the height of the supporting legs of the triangular support frame 6 through screw transmission, so that the lifting equipment is stably fixed at the working site for lifting operation.
S2, hoisting: the thrust rod 42 is started to adjust the position of the lifting hook, the lifting hook is matched with a lifting belt to fix a heavy object, the direction of the lifting force is positioned on a plumb line of the gravity center of the heavy object, the motor 32 is started to start lifting, the balance inductor monitors whether the heavy object inclines or not at any time in the lifting process, and if the heavy object inclines, the balance stability of the heavy object is automatically adjusted.
S3: the adjusting process comprises the following steps: the inclined side of the weight is lifted normally, the friction disc two 383 on the other side is demagnetized, the friction disc two 383 is separated from the friction disc one 382 under the action of the spring 384, the lifting of the self-locking winch 39 is stopped, the self-locking winch 39 is locked, the friction disc two 383 is magnetized after the weight is stably balanced, the separated friction disc two 383 and the friction disc one 382 are re-meshed, the weight is lifted together, the lifting resultant force direction of the equipment is constantly adjusted to be located on a plumb line of the gravity center of the weight by controlling the working condition of the self-locking winch 39, and the side turning caused by the unstable gravity center of the lifted weight can be effectively prevented.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (9)
1. A safe and stable hoisting equipment for construction engineering is characterized in that: the method comprises the following steps:
two symmetrically arranged triangular support frames (6);
the telescopic inner pipe (5) is arranged above the triangular support frame (6) in a vertically sliding manner;
the fixed end of the adjusting cylinder (7) is hinged to the side of the triangular support frame (6), and the output end of the adjusting cylinder is hinged to the side of the telescopic inner pipe (5);
the I-shaped steel guide rail (8) is fixed above the two telescopic inner pipes (5); and
headstock (3), but through the setting of four drive wheel (2) side-to-side motion of its below be in on I-steel guide rail (8), headstock (3) have two promotion ends that can independently promote, and two promotion ends are connected with hoist and mount subassembly (4) through wire rope (1) jointly.
2. A safe and stable lifting device for construction engineering as claimed in claim 1, wherein: the triangular support frame (6) is a triangular support formed by connecting rectangular pipe sectional materials and used for supporting the lifting equipment, two ends below the triangular support frame are symmetrically provided with a forward wheel (62) and a ground grabbing adjuster (61), wherein the forward wheel (62) is rotatably arranged below the triangular support frame (6), the ground grabbing adjuster (61) is fixed on the outer side of the forward wheel (62), and the ground grabbing adjuster (61) finely adjusts the height of the supporting legs of the triangular support frame (6) through threaded transmission so as to ensure that the lifting equipment is stably fixed on a working place.
3. A safe and stable lifting device for construction engineering as claimed in claim 1, wherein: the power box (3) comprises:
the box body (31) is movably arranged above the I-shaped steel guide rail (8) through the driving wheel (2), and the interior of the box body (31) can be divided into two cavities;
a motor (32) fixed to the outside of the case (31);
two synchronous wheels (37) are symmetrically arranged and rotatably mounted in the cavity close to one side of the motor (32), wherein one synchronous wheel (37) is directly connected with the motor (32);
the synchronous belt (36) is in transmission connection with the synchronous wheel (37), and an adjusting bracket (35) fixed on the inner wall of the box body (31) is arranged above the synchronous belt (36);
the adjusting wheel (33) is arranged in the adjusting bracket (35) in a sliding way through an adjusting knob (34) and is used for adjusting the matching of the synchronous belt; and
the self-locking winch (39) is fixed in the cavity at one side far away from the motor (32) and is in transmission connection with the synchronizing wheel (37) through a transmission assembly (38).
4. A safe and stable lifting device for construction engineering as claimed in claim 3, wherein: the self-locking winch (39) is internally coiled with the steel wire rope (1), and can perform self-locking in the working process to prevent heavy objects from falling.
5. A safe and stable lifting device for construction engineering as claimed in claim 3, wherein: the transmission assembly (38) comprises:
a first friction disc (382) connected with the synchronous wheel (37) through a first transmission shaft (381);
one end of the second transmission shaft (385) is connected with the input end of the self-locking winch (39), and the other end of the second transmission shaft is slidably provided with a second friction disc (383); and
and the spring (384) is arranged between the first friction disc (382) and the second friction disc (383), sleeved on the outer wall of the second transmission shaft (385) and fixed on the end surface of the first friction disc (382).
6. A safe and stable hoisting equipment for construction engineering according to claim 5, wherein: and a sliding key is arranged on the surface of the second transmission shaft (385), and a sliding groove is formed in the central inner hole of the second friction disc (383).
7. A safe and stable hoisting equipment for construction engineering according to claim 5, wherein: an electromagnet is arranged inside the second friction disk (383), knurling processing is conducted on the end faces of the first friction disk (382) and the second friction disk (383), and patterns on the end faces can be meshed with each other.
8. A safe and stable lifting device for construction engineering as claimed in claim 1, wherein: the hoisting assembly (4) comprises:
the hoisting plate (41) is hinged with the steel wire rope (1), and a T-shaped sliding groove is formed in the hoisting plate;
the two sliding blocks (44) are arranged in the T-shaped sliding groove in a sliding manner;
the fixed end of the thrust rod (42) is hinged to the side wall of the hoisting plate (41), and the telescopic end of the thrust rod is hinged to the side wall of the sliding block (44) and used for driving the sliding block (44) to move; and
and the lifting hook (43) is rotatably arranged below the sliding block (44) and is matched with the hanging strip to lift a heavy object.
9. A safe and stable lifting device for construction engineering as claimed in claim 8, wherein: the balance inductor is arranged inside the hoisting plate (41), so that the inclination condition in the hoisting process can be monitored conveniently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210802652.1A CN115123922A (en) | 2022-07-07 | 2022-07-07 | Safe and stable's lifting devices for building engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210802652.1A CN115123922A (en) | 2022-07-07 | 2022-07-07 | Safe and stable's lifting devices for building engineering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115123922A true CN115123922A (en) | 2022-09-30 |
Family
ID=83381443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210802652.1A Withdrawn CN115123922A (en) | 2022-07-07 | 2022-07-07 | Safe and stable's lifting devices for building engineering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115123922A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116101890A (en) * | 2022-12-01 | 2023-05-12 | 中铁广州工程局集团有限公司 | Hoisting machine sideslip landing leg for severe offshore conditions |
| CN116715133A (en) * | 2023-08-11 | 2023-09-08 | 天津三号线轨道交通运营有限公司 | Steel rail hoisting lifting appliance with adjustable lifting point |
-
2022
- 2022-07-07 CN CN202210802652.1A patent/CN115123922A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116101890A (en) * | 2022-12-01 | 2023-05-12 | 中铁广州工程局集团有限公司 | Hoisting machine sideslip landing leg for severe offshore conditions |
| CN116101890B (en) * | 2022-12-01 | 2024-04-02 | 中铁广州工程局集团有限公司 | Hoisting machine sideslip landing leg for severe offshore conditions |
| CN116715133A (en) * | 2023-08-11 | 2023-09-08 | 天津三号线轨道交通运营有限公司 | Steel rail hoisting lifting appliance with adjustable lifting point |
| CN116715133B (en) * | 2023-08-11 | 2023-11-24 | 天津三号线轨道交通运营有限公司 | Steel rail hoisting lifting appliance with adjustable lifting point |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220930 |
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| WW01 | Invention patent application withdrawn after publication |