CN112811325A - Pipe material hoisting accessory for construction - Google Patents
Pipe material hoisting accessory for construction Download PDFInfo
- Publication number
- CN112811325A CN112811325A CN202110050675.7A CN202110050675A CN112811325A CN 112811325 A CN112811325 A CN 112811325A CN 202110050675 A CN202110050675 A CN 202110050675A CN 112811325 A CN112811325 A CN 112811325A
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- CN
- China
- Prior art keywords
- base
- transmission
- screw rod
- rod
- seat
- Prior art date
- 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.)
- Withdrawn
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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
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/06—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
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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
- B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
- B66C1/28—Duplicate, e.g. pivoted, members engaging the loads from two sides
- B66C1/30—Duplicate, e.g. pivoted, members engaging the loads from two sides and also arranged to grip the sides of the 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
- B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
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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
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/26—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
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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
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/72—Counterweights or supports for balancing lifting couples
- B66C23/78—Supports, e.g. outriggers, for mobile cranes
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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
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/82—Luffing gear
Abstract
The invention discloses a pipe material hoisting device for building construction, which comprises a base, wherein a base plate is movably arranged at the upper end of the base, a base is fixed at the middle position of the upper end of the base plate, two vertical machine bodies are arranged on the base at intervals, a bent movable seat is movably arranged between the two machine bodies, and a hoisting mechanism is assembled on the movable seat; the pipe material hoisting device for building construction controls the distance between the two assembling seats through the adjusting screw rod, so that pipe materials with different lengths can be hoisted conveniently; in addition, the pipe and the two limiting rings are clamped, and the lifting of the transmission chamber is controlled through the cable disc, so that the pipe has a certain limiting effect, and the shaking in the pipe lifting process is effectively reduced; the sliding seat is controlled to move through the sliding screw rod, so that the angle of the movable seat can be conveniently adjusted; in addition, the lifting screw rod controls the base plate to lift, the stroke range of the lifting device can be adjusted, and the use convenience is improved.
Description
Technical Field
The invention relates to a hoisting machine, in particular to a pipe material hoisting device for building construction.
Background
The building construction refers to production activities in the engineering construction implementation stage, is the construction process of various buildings, and also can be a process of changing various lines on a design drawing into a real object at a specified place. The method comprises foundation engineering construction, main structure construction, roofing engineering construction, decoration engineering construction and the like. The site of the construction work is called a "construction site" or a "construction site", also called a construction site; when building construction is carried out, building pipe materials are often required to be lifted, the existing lifting device is easy to shake in actual use, pipe materials with different lengths are inconvenient to lift, and the lifting device is not convenient to use; therefore, there is a need for improvements in the prior art.
Disclosure of Invention
The invention aims to provide a pipe material hoisting device for building construction, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a pipe material lifting device for building construction comprises a base, wherein a base plate is movably mounted at the upper end of the base, a base is fixed at the middle position of the upper end of the base plate, two vertical machine bodies are distributed on the base at intervals, a bent movable seat is movably mounted between the two machine bodies, and a lifting mechanism is assembled on the movable seat; as a further scheme of the invention: hoisting machine constructs including the assembly seat, the inboard interval of sliding seat is equipped with horizontally accommodate the lead screw and second transfer line, accommodate the lead screw's one end extends to the inboard and the transmission of sliding seat and is connected with the motor, accommodate the lead screw is two-way lead screw, the interval is equipped with two assembly seats between accommodate the lead screw and the second transfer line, assembly seat and accommodate the lead screw transmission cooperation and with second transfer line slidable mounting, the lower extreme of assembly seat is fixed with the drive chamber, the indoor cable dish that is equipped with of drive chamber, the transmission of cable dish is connected with the motor, the transmission room has been laid to the below of drive chamber, the indoor pulley that is equipped with of transmission, the cable dish is connected with the pulley via the rope, the holding ring has been laid to the lower extreme of drive chamber, the one end of rope is connected with the holding ring.
As a further scheme of the invention: the clamping structure comprises a vertical clamping hydraulic cylinder, an execution rod of the clamping hydraulic cylinder is connected to a hinge, a limiting ring is rotatably mounted on the hinge, the limiting ring comprises two semicircular parts and is connected with an even hinge in a rotating mode, inclined assembly rods are connected between the two sides of the clamping hydraulic cylinder and the limiting ring, the two ends of each assembly rod are rotatably connected with lug seats, and the two ends of each assembly rod are respectively connected with the clamping hydraulic cylinder and the limiting ring through the lug seats.
As a further scheme of the invention: the limiting ring is characterized in that a buckle and a clamping groove which are matched with each other are arranged between the two semicircular parts of the limiting ring, and the cross section of the buckle is arc-shaped.
As a further scheme of the invention: one side fixedly connected with frame of organism, the one end and the rack rotation installation of sliding seat, the inboard upper portion of organism is equipped with the vertical lead screw that slides, the one end of the lead screw that slides extends to the inside and the transmission of organism and is connected with the motor, the transmission is installed on the lead screw that slides, slide and organism slidable mounting, the one end of slide extend to the outside of organism and with the sliding seat between be connected with the connecting rod of slope, the connecting seat is installed in the both ends rotation of connecting rod, the both ends of connecting rod are connected with slide and sliding seat respectively via the connecting seat.
As a further scheme of the invention: two sets of vertical lift lead screws and first transfer line have been laid at the interval on the base, and the lift lead screw and the one end that first transfer line deviates from the base are equipped with the mount pad, and the one end of lift lead screw extends to the inside of base and the transmission is connected with the motor, the both sides of base plate respectively with lift lead screw transmission cooperation and with first transfer line slidable mounting.
As a further scheme of the invention: the lower extreme of base evenly is equipped with a plurality of universal wheels, has laid the locking switch on the universal wheel, and the both sides of base are connected with the positioning seat, and a plurality of vertical positioning bolt are installed to the equidistance on the positioning seat, and positioning bolt's one end extends to the below of base and rotates and be equipped with the locating piece.
As a further scheme of the invention: and the inner wall of the limiting ring is provided with a non-slip mat made of rubber.
Compared with the prior art, the invention has the beneficial effects that: the pipe material hoisting device for building construction controls the distance between the two assembling seats through the adjusting screw rod, is convenient for hoisting pipe materials with different lengths, controls the opening and closing of the limiting ring through the clamping hydraulic cylinder, and is convenient for effectively clamping and fixing the pipe materials; in addition, the pipe and the two limiting rings are clamped, and the lifting of the transmission chamber is controlled through the cable disc, so that the pipe has a certain limiting effect, and the shaking in the pipe lifting process is effectively reduced; the sliding seat is controlled to move through the sliding screw rod, so that the angle of the movable seat can be conveniently adjusted, and the pipe materials can be conveniently lifted and taken and placed; in addition, the lifting screw rod controls the base plate to lift, the stroke range of the lifting device can be adjusted, and the use convenience is improved.
Drawings
Fig. 1 is a schematic structural diagram of a pipe material hoisting device for building construction.
Fig. 2 is a schematic structural view of a movable seat in the pipe lifting device for building construction.
Fig. 3 is an enlarged view of a portion a in fig. 1.
In the figure: 1-base, 2-positioning seat, 3-positioning bolt, 4-positioning block, 5-universal wheel, 6-base plate, 7-lifting screw rod, 8-first transmission rod, 9-mounting seat, 10-base, 11-machine body, 12-machine frame, 13-movable seat, 14-sliding screw rod, 15-sliding seat, 16-connecting rod, 17-connecting seat, 18-assembling seat, 19-driving chamber, 20-cable disc, 21-transmission chamber, 22-pulley, 23-positioning ring, 24-clamping hydraulic cylinder, 25-hinge, 26-assembling rod, 27-ear seat, 28-spacing ring, 29-adjusting screw rod, 30-second transmission rod and 31-buckle.
Detailed Description
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example 1
Referring to fig. 1-3, a pipe material hoisting device for building construction comprises a base 1, wherein a base plate 6 is movably mounted at the upper end of the base 1, a base 10 is fixed at the middle position of the upper end of the base plate 6, two vertical machine bodies 11 are arranged on the base 10 at intervals, a bent movable seat 13 is movably mounted between the two machine bodies 11, and a hoisting mechanism is mounted on the movable seat 13; the hoisting mechanism comprises an assembly seat 18, a horizontal adjusting screw rod 29 and a second transmission rod 30 are assembled on the inner side of a movable seat 13 at intervals, one end of the adjusting screw rod 29 extends to the inner side of the movable seat 13 and is connected with a motor in a transmission manner, the adjusting screw rod 29 is a bidirectional screw rod, two assembly seats 18 are assembled between the adjusting screw rod 29 and the second transmission rod 30 at intervals, the assembly seats 18 are in transmission fit with the adjusting screw rod 29 and are slidably installed with the second transmission rod 30, a driving chamber 19 is fixed at the lower end of each assembly seat 18, a cable disc 20 is assembled in the driving chamber 19, the cable disc 20 is connected with the motor in a transmission manner, a transmission chamber 21 is arranged below the driving chamber 19, a pulley 22 is assembled in the transmission chamber 21, the cable disc 20 is connected with the pulley 22 through a rope, a positioning ring 23 is arranged at the lower end of the driving chamber 19, one end of the rope is connected with the positioning, the clamping device is used for clamping and fixing the pipe materials, and is convenient to lift; the cable reel 20 is started to operate, so that the rope drives the transmission chamber 21 to lift through the pulley 22, and the pipe material is lifted.
Further, the clamping structure includes vertical centre gripping pneumatic cylinder 24, connect in hinge 25 on the actuating lever of centre gripping pneumatic cylinder 24, rotate on the hinge 25 and install spacing ring 28, spacing ring 28 includes that two semicircle parts and even hinge 25 rotate to be connected, be connected with the assembly pole 26 of slope between the both sides of centre gripping pneumatic cylinder 24 and the spacing ring 28, the both ends of assembly pole 26 are rotated and are connected with the ear seat 27, the both ends of assembly pole 26 are connected with centre gripping pneumatic cylinder 24 and spacing ring 28 respectively via ear seat 27, thereby open and shut through centre gripping pneumatic cylinder 24 control spacing ring 28, be convenient for getting of tubular product and put.
Furthermore, buckle 31 and the draw-in groove of mutual matching have been laid between two semicircle parts of spacing ring 28, and the cross-section of buckle 31 becomes the arc for promote the structural strength of spacing ring 28 during operation, avoid the tubular product to take place to drop when lifting by crane.
Further, a frame 12 is fixedly connected to one side of the machine body 11, one end of a movable seat 13 is rotatably mounted with the frame 12, a vertical sliding screw 14 is assembled at the upper portion of the inner side of the machine body 11, one end of the sliding screw 14 extends into the machine body 11 and is in transmission connection with a motor, a sliding seat 15 is mounted on the sliding screw 14 in transmission, the sliding seat 15 is slidably mounted with the machine body 11, one end of the sliding seat 15 extends to the outer side of the machine body 11 and is connected with an inclined connecting rod 16 between the sliding seat 13 and the outer side of the machine body 11, two ends of the connecting rod 16 are rotatably mounted with connecting seats 17, and two ends of the connecting rod 16 are respectively connected with; the sliding slide 15 is driven to slide by the sliding screw 14, so that the movable seat 13 is driven to rotate by the connecting rod 16, the position of the movable seat 13 is changed, and the hoisting operation is facilitated.
Further, base 1 is gone up the interval and has been laid two sets of vertical lift lead screw 7 and first transfer line 8, and the lift lead screw 7 and the one end that first transfer line 8 deviates from base 1 are equipped with mount pad 9, and the one end of lift lead screw 7 extends to the inside of base 1 and the transmission is connected with the motor, the both sides of base plate 6 respectively with 7 transmission cooperation of lift lead screw and with 8 slidable mounting of first transfer line to change the whole height of base plate 6 through lift lead screw 7, promote hoisting accessory's application range.
Further, the lower extreme of base 1 evenly is equipped with a plurality of universal wheels 5, has laid the locking switch on the universal wheel 5, and the both sides of base 1 are connected with positioning seat 2, and a plurality of vertical positioning bolt 3 are installed to 2 equidistance in positioning seat, and positioning bolt 3's one end extends to the below of base 1 and rotates and be equipped with locating piece 4, so that right it is right hoisting accessory carries out rigidity, convenient to use.
The working principle of the embodiment is as follows:
during actual operation, the adjusting screw 29 is started to operate according to the length of the pipe material, and the adjusting screw 29 drives the two assembling seats 18 to approach or separate from each other, so that a proper distance is obtained; placing the pipe to be lifted between the two limiting rings 28, and starting the clamping hydraulic cylinder 24 to close the limiting rings 28, so as to clamp and fix the pipe; starting the cable tray 20 to run, wherein the cable tray 20 drives the transmission chamber 21 to move upwards through the rope and the pulley 22, so that the pipe material stably rises; after the cable tray 20 is lifted to a proper height, the operation of the cable tray is stopped, the sliding screw rod 14 is started to operate, the sliding screw rod 14 drives the sliding seat 15 to move, so that the movable seat 13 is driven to rotate through the connecting rod 16, the position of the movable seat 13 is changed, the placement of the pipe materials is facilitated, and then the clamping hydraulic cylinder 24 is started to open the limiting ring 28, so that the pipe materials are placed; the overall height of the base plate 6 can be adjusted through the lifting screw rod 7, the lifting range of the lifting device is enlarged, and the practicability is improved.
Example 2
In order to promote the stability of pipe material clamping, avoid taking place the landing in the in-process of lifting by crane, this embodiment improves on embodiment 1's basis, and the improvement part is: the inner wall cloth of spacing ring 28 is equipped with the slipmat of rubber material for promote the frictional force of pipe material clamping back and spacing ring 28, avoid taking place the landing, promote the security of operation.
It should be noted that, although the present specification describes embodiments, each embodiment does not include only a single technical solution, and such description of the specification is only for clarity, and those skilled in the art should take the specification as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art, and the above-mentioned embodiments only express the preferred embodiments of the technical solutions, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the claims of the technical solutions. It should be noted that, for those skilled in the art, various modifications, improvements and substitutions can be made without departing from the spirit of the invention, and all of them belong to the protection scope of the technical solution. The protection scope of this technical solution patent should be subject to the appended claims.
Claims (7)
1. A pipe material hoisting device for building construction comprises a base (1) and is characterized in that a base plate (6) is movably mounted at the upper end of the base (1), a base (10) is fixed at the middle position of the upper end of the base plate (6), two vertical machine bodies (11) are distributed on the base (10) at intervals, a bent movable seat (13) is movably mounted between the two machine bodies (11), and a hoisting mechanism is assembled on the movable seat (13); the hoisting mechanism comprises an assembly seat (18), a horizontal adjusting screw rod (29) and a second transmission rod (30) are assembled on the inner side of the movable seat (13) at intervals, one end of the adjusting screw rod (29) extends to the inner side of the movable seat (13) and is in transmission connection with a motor, the adjusting screw rod (29) is a bidirectional screw rod, two assembly seats (18) are assembled between the adjusting screw rod (29) and the second transmission rod (30) at intervals, the assembly seats (18) are in transmission fit with the adjusting screw rod (29) and are in sliding installation with the second transmission rod (30), a driving chamber (19) is fixed at the lower end of each assembly seat (18), a cable disc (20) is assembled in the driving chamber (19), the cable disc (20) is in transmission connection with the motor, a transmission chamber (21) is arranged below the driving chamber (19), pulleys (22) are assembled in the transmission chamber (21), and the cable disc (20) is connected with the pulleys (22) through ropes, a positioning ring (23) is arranged at the lower end of the driving chamber (19), one end of the rope is connected with the positioning ring (23), and a clamping structure is arranged at the lower end of the transmission chamber (21).
2. The pipe material hoisting device for building construction according to claim 1, wherein the clamping structure comprises a vertical clamping hydraulic cylinder (24), an actuating rod of the clamping hydraulic cylinder (24) is connected to a hinge (25), a limiting ring (28) is rotatably mounted on the hinge (25), the limiting ring (28) comprises two semicircular parts and is rotatably connected to the hinge (25), an inclined assembling rod (26) is connected between two sides of the clamping hydraulic cylinder (24) and the limiting ring (28), two ends of the assembling rod (26) are rotatably connected to lug seats (27), and two ends of the assembling rod (26) are respectively connected to the clamping hydraulic cylinder (24) and the limiting ring (28) through the lug seats (27).
3. The pipe material hoisting device for building construction according to claim 2, wherein a buckle (31) and a clamping groove which are matched with each other are arranged between the two semicircular parts of the limiting ring (28), and the cross section of the buckle (31) is arc-shaped.
4. The pipe material hoisting device for building construction according to claim 1, wherein a frame (12) is fixedly connected to one side of the machine body (11), one end of the movable seat (13) is rotatably installed with the frame (12), a vertical sliding screw rod (14) is assembled on the upper portion of the inner side of the machine body (11), one end of the sliding screw rod (14) extends to the inside of the machine body (11) and is in transmission connection with a motor, a sliding seat (15) is rotatably installed on the sliding screw rod (14), the sliding seat (15) is slidably installed with the machine body (11), one end of the sliding seat (15) extends to the outer side of the machine body (11) and is connected with an inclined connecting rod (16) between the sliding seat (13), connecting seats (17) are rotatably installed at two ends of the connecting rod (16), and two ends of the connecting rod (16) are respectively connected with the sliding seat (15) and the movable seat (13) through.
5. The pipe material hoisting device for building construction according to claim 4, wherein two sets of vertical lifting screw rods (7) and first transmission rods (8) are arranged on the base (1) at intervals, one ends of the lifting screw rods (7) and the first transmission rods (8) departing from the base (1) are provided with mounting seats (9), one ends of the lifting screw rods (7) extend to the inside of the base (1) and are connected with motors in a transmission manner, and two sides of the base plate (6) are respectively matched with the lifting screw rods (7) in a transmission manner and are slidably mounted with the first transmission rods (8).
6. The pipe material hoisting device for building construction according to claim 1, wherein the lower end of the base (1) is uniformly assembled with a plurality of universal wheels (5), locking switches are distributed on the universal wheels (5), two sides of the base (1) are connected with positioning seats (2), a plurality of vertical positioning bolts (3) are equidistantly installed on the positioning seats (2), and one ends of the positioning bolts (3) extend to the lower part of the base (1) and are rotatably assembled with positioning blocks (4).
7. The pipe material hoisting device for building construction according to claim 3, wherein the inner wall of the limiting ring (28) is provided with a rubber non-slip mat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110050675.7A CN112811325A (en) | 2021-01-14 | 2021-01-14 | Pipe material hoisting accessory for construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110050675.7A CN112811325A (en) | 2021-01-14 | 2021-01-14 | Pipe material hoisting accessory for construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112811325A true CN112811325A (en) | 2021-05-18 |
Family
ID=75869323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110050675.7A Withdrawn CN112811325A (en) | 2021-01-14 | 2021-01-14 | Pipe material hoisting accessory for construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112811325A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113636477A (en) * | 2021-08-09 | 2021-11-12 | 北京市政建设集团有限责任公司 | Steel lifting device for tower crane steel platform construction |
-
2021
- 2021-01-14 CN CN202110050675.7A patent/CN112811325A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113636477A (en) * | 2021-08-09 | 2021-11-12 | 北京市政建设集团有限责任公司 | Steel lifting device for tower crane steel platform construction |
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Application publication date: 20210518 |