CN114348860A - Steel box girder hoisting equipment with automatic leveling function - Google Patents
Steel box girder hoisting equipment with automatic leveling function Download PDFInfo
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- CN114348860A CN114348860A CN202111651310.6A CN202111651310A CN114348860A CN 114348860 A CN114348860 A CN 114348860A CN 202111651310 A CN202111651310 A CN 202111651310A CN 114348860 A CN114348860 A CN 114348860A
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Abstract
The invention relates to a steel box girder hoisting device with an automatic leveling function, which comprises two hoisting arms, wherein the bottoms of the two hoisting arms are respectively provided with a supporting base, one side of each hoisting arm is provided with a supporting plate, the lower side surface of each supporting plate is embedded with a plurality of pairs of horizontal adjusting mechanisms arranged side by side, each horizontal adjusting mechanism comprises an installation box, the lower side of each horizontal adjusting mechanism is provided with a vertical adjusting mechanism, the lower side of each vertical adjusting mechanism is provided with a hoisting mechanism, a hoisting block arranged at a hoisting point of a steel box girder is clamped by the hoisting mechanism, each vertical adjusting mechanism comprises a hoisting box, a tension meter and a cable disc, the cable disc is arranged at one side in the hoisting box, the movable pulley is hoisted in the vertical direction by the winding connection of a steel cable and the movable pulley, and then the hoisting base is hoisted by the movable pulley, and the tension force born by the hoisting point of the steel box girder is continuously known by the tension meter, the stress imbalance of the steel box girder during hoisting is avoided, and therefore the steel box girder is better leveled.
Description
Technical Field
The invention relates to the technical field of steel box girder hoisting, in particular to steel box girder hoisting equipment with an automatic leveling function.
Background
For the construction of large-scale bridges, because the dead weight of a large-section steel box girder is large, in order to ensure that the steel box girder is not deformed during hoisting, a truss type or a pressure bar type hoisting tool is generally adopted, the weight of the steel box girder is distributed to a plurality of hoisting points, each hoisting point is only stressed in the vertical direction, the hoisting points are prevented from being stressed by horizontal component force during hoisting to cause the extrusion deformation of a steel box girder bridge deck, and the conventional steel box girder hoisting equipment is shown in fig. 6.
The invention patent with publication number CN113734983A discloses a steel box girder hoisting device for building construction, belongs to the technical field of steel box girder hoisting, and comprises: the upper ends of the four supporting legs are fixedly connected with a supporting frame; translation mechanism, translation mechanism comprises drive assembly and two sets of sliding assembly, translation mechanism sets up in the upper end of support frame, two sets of sliding assembly are by the guide rail, fixed frame and two first pulleys are constituteed, guide rail fixed connection is in the upper end of support frame, two first pulleys all slide the joint in the upper end of guide rail, fixed frame fixed connection is in the both ends of two first pulleys, two sets of sliding assembly set up respectively in the both parts of support frame, be located the first bull stick of fixedly connected with between two first pulleys of front side.
The existing steel box girder hoisting equipment is usually required to manually adjust a hoisting tool in the process of hoisting the steel box girder so that the steel box girder keeps horizontal, each hoisting point is stressed in balance, the process is long and is full of danger, the steel box girder for construction is usually more in number, and therefore the construction efficiency is greatly influenced.
Disclosure of Invention
The invention aims to provide the steel box girder hoisting equipment with the automatic leveling function aiming at the problems and the defects, so that the overall working efficiency is improved.
The technical problem solved by the invention is as follows:
(1) the existing steel box girder hoisting equipment is usually required to manually adjust a hoisting tool in the process of hoisting the steel box girder so as to keep the steel box girder horizontal, the construction efficiency is low, and a large special-shaped piece is usually required to be hoisted, but the existing steel box girder hoisting equipment cannot balance the tension force applied to each hoisting point of the large special-shaped piece;
(2) the existing steel box girder hoisting equipment cannot be correspondingly adjusted according to the distribution of hoisting points in the process of hoisting the steel box girder, so that a connecting piece and the hoisting points are very easy to damage, and the existing steel box girder hoisting equipment cannot be automatically and rapidly butted when being butted with the hoisting points, so that the construction time is overlong, and the construction progress is influenced.
The purpose of the invention can be realized by the following technical scheme: a steel box girder hoisting device with an automatic leveling function comprises two groups of boom frames, wherein the bottoms of the two boom frames are respectively provided with a supporting base, one side of each boom frame is provided with a supporting plate, the lower side surface of each supporting plate is embedded with a plurality of pairs of horizontal adjusting mechanisms arranged side by side, each horizontal adjusting mechanism comprises an installation box, the lower side of each horizontal adjusting mechanism is provided with a vertical adjusting mechanism, the lower side of each vertical adjusting mechanism is provided with a hoisting mechanism, the hoisting block arranged at the hoisting point of the steel box girder is clamped by the hoisting mechanism, the vertical adjusting mechanism comprises a hoisting box, a tension meter and a cable rope disc, the cable rope disc is arranged at one side inside the hoisting box, the other side inside the hoisting box is provided with a worm gear motor, the middle part of the cable rope disc is wound with a steel cable rope, one end of the steel cable rope is fixedly connected on the cable rope disc, and the other end of the steel cable extends out of the bottom of the lifting box and is fixedly connected with the lower side surface of the lifting box.
As a further scheme of the invention, the mounting box and the stepping motor are embedded on the lower surface of the supporting plate, the stepping motor is fixedly mounted at one end of the mounting box, the interior of the mounting box is rotatably connected with a transmission screw rod, the end part of a driving shaft of the stepping motor penetrates through the side wall of the mounting box and is fixedly connected with one end of the transmission screw rod, a transmission slide block is sleeved on the transmission screw rod in a threaded manner, and the transmission slide block is in sliding connection with the inner side wall of the mounting box.
As a further scheme of the invention, a plurality of through chutes which are distributed at equal intervals are formed in the lower side of the mounting box, connecting blocks are connected in the through chutes in a sliding manner, and the transmission sliding block is fixedly connected with the top of the lifting box of the vertical adjusting mechanism through the connecting blocks.
As a further scheme of the invention, a hoisting seat is arranged in the middle of a steel cable, a movable pulley is arranged in the middle of the upper side of the hoisting seat, the middle of the steel cable penetrates through the middle of the hoisting seat and is wound on the movable pulley, a transmission worm wheel is arranged at one end of a cable disc close to a worm gear motor, a transmission worm is fixedly connected to the end part of a driving shaft of the worm gear motor, and the transmission worm is in meshing transmission with the transmission worm wheel.
As a further scheme of the invention, the lower end of the lifting seat is fixedly connected with a tension meter, and the lower end of the tension meter is connected with a lifting mechanism.
According to a further scheme of the invention, the lifting mechanism comprises a supporting disk, the upper surface of the supporting disk is fixedly connected with a plurality of connecting columns which are uniformly distributed in an equal angle, the supporting disk is fixedly connected with the lower end of the tension meter through the connecting columns, and a plurality of clamping rods which are uniformly distributed in an equal angle are embedded in the periphery of the supporting disk.
As a further scheme of the invention, the clamping rods and the connecting columns are arranged in a staggered manner, the supporting disk is abutted against the side face of the middle part of each clamping rod, a rotating shaft penetrates through the middle part of each clamping rod, and each clamping rod is rotatably connected with the corresponding supporting disk through the corresponding rotating shaft.
According to a further scheme of the invention, the middle part of the upper surface of the supporting plate is fixedly connected with an electric push rod, the electric push rod is vertically upward, a transmission rod is arranged between the telescopic end of the electric push rod and the upper end of each clamping rod, two ends of the transmission rod are respectively rotatably connected with the electric push rod and the clamping rods, and the lower ends of the clamping rods are fixedly connected with clamping hooks.
The invention has the beneficial effects that:
(1) the transmission screw is driven to rotate by the stepping motor, the transmission slide block is pushed to move in the mounting box by the transmission screw, the hoisting box is pushed by the transmission slide block, so that the vertical adjusting mechanism is pushed to move by the transmission slide block, the positions of the vertical adjusting mechanism and the hoisting mechanism are adjusted according to the position of a hoisting point, the vertical adjusting mechanism is kept in a vertical state, the hoisting mechanism is further enabled to vertically lift the hoisting block, the worm gear motor drives the transmission worm gear by rotating the transmission worm, the cable disc is driven by the transmission worm gear, the steel cable is wound and released by the cable disc, the movable pulley is vertically lifted by the winding connection of the steel cable and the movable pulley, and further the hoisting seat is lifted by the movable pulley, the tension force borne by the hoisting point of the steel box girder is continuously known by the tension meter, so that the unbalanced stress of the steel box girder during hoisting is avoided, therefore, the steel box girder is leveled better, the steel box girder is stably hoisted, the steel box girder is automatically leveled, and each hoisting point is balanced in stress;
(2) the shrink through electric putter, thereby each transfer line is gathered together to the centre, and then each holding rod overturns through the transfer line, outwards strut through the holding rod and make holding rod and holding hook cover on the hoist and mount piece of handling point, electric putter extends afterwards, to strutting each transfer line all around, thereby gather together the holding hook, carry out the centre gripping through the holding hook to the hoist and mount piece, promote through vertical guiding mechanism afterwards, thereby promote the hoist and mount piece, and then carry out the handling to the steel case roof beam, and make the handling piece of each handling point of steel case roof beam keep stable and the balanced state of atress.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a bottom view of the internal structure of the support plate of the present invention;
FIG. 3 is a schematic view of the internal structure of the horizontal adjustment mechanism of the present invention;
FIG. 4 is a schematic view of the internal structure of the vertical adjustment mechanism of the present invention;
FIG. 5 is a side view of the overall construction of the hoist mechanism of the present invention;
FIG. 6 is a schematic diagram of a prior art structure;
in the figure: 1. a boom frame; 2. a support base; 3. a support plate; 4. a hoisting mechanism; 5. mounting a box; 6. a stepping motor; 7. a through chute; 8. a drive screw; 9. hoisting the box; 10. a hoisting seat; 11. a tension meter; 12. a cable reel; 13. a worm gear motor; 14. a steel cable; 15. a support disc; 16. an electric push rod; 17. a clamping rod; 18. a transmission rod; 19. a clamping hook; 20. a movable pulley; 21. a winch; 22. connecting columns; 23. and a transmission slide block.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Please refer to fig. 1-5: a steel box girder hoisting device with an automatic leveling function comprises two groups of boom frames 1, wherein the boom frames 1 are arranged side by side, supporting bases 2 used for lowering the center of gravity and expanding the supporting surface are respectively arranged at the bottoms of the two boom frames 1, a supporting plate 3 is arranged at one side of each boom frame 1, a winch 21 used for lifting the supporting plate 3 is arranged at the other side of each boom frame 1, a connecting piece used for being butted with the winch 21 is arranged at the top of the supporting plate 3, the supporting plate 3 is kept horizontal when the supporting plate 3 is hoisted synchronously by the two winch 21 through the connecting piece, a plurality of pairs of horizontal adjusting mechanisms arranged side by side are embedded at the lower side surface of the supporting plate 3, each horizontal adjusting mechanism comprises a mounting box 5, a stepping motor 6, a transmission screw 8 and a transmission slide block 23, and a vertical adjusting mechanism is arranged at the lower side of each horizontal adjusting mechanism, hoisting mechanisms 4 are installed on the lower side of each vertical adjusting mechanism, hoisting blocks installed at hoisting points of the steel box girder are clamped through the hoisting mechanisms 4, the vertical height of each part of the steel box girder is adjusted through the vertical adjusting mechanisms, and the horizontal position of each vertical adjusting mechanism is adjusted through the horizontal adjusting mechanism, so that the hoisting mechanisms 4 are kept at the installation position in a vertical state, the steel box girder is kept horizontal, and the steel box girder is prevented from being butted accurately.
The mounting box 5 and the stepping motor 6 are embedded on the lower surface of the supporting plate 3, the stepping motor 6 is fixedly mounted at one end of the mounting box 5, the horizontal adjusting mechanisms at the two sides are bilaterally symmetrical, the interior of the mounting box 5 is rotatably connected with a transmission screw 8, the end part of a driving shaft of the stepping motor 6 penetrates through the side wall of the mounting box 5 and is fixedly connected with one end of the transmission screw 8, a transmission slide block 23 is sleeved on the transmission screw 8 in a threaded manner, the transmission slide block 23 is slidably connected with the inner side wall of the mounting box 5, a plurality of through chutes 7 which are distributed at equal intervals are formed in the lower side of the mounting box 5, a connecting block is slidably connected in the through chutes 7, the vertical adjusting mechanism comprises a hoisting box 9, and the transmission slide block 23 is fixedly connected with the top of the hoisting box 9 of the vertical adjusting mechanism through the connecting block;
drive screw 8 through step motor 6 and rotate, promote transmission slider 23 through drive screw 8 and remove in mounting box 5, promote handling box 9 through transmission slider 23 to promote vertical guiding mechanism through transmission slider 23 and remove, according to the position of the vertical guiding mechanism of position adjustment of hoisting point and handling mechanism 4, keep vertical guiding mechanism to be vertical state, and then make handling mechanism 4 keep lifting and dropping the hoist and mount piece vertically.
The vertical adjusting mechanism further comprises a tension meter 11 and a cable reel 12, the cable reel 12 is installed on one side inside the lifting box 9, a worm gear motor 13 is arranged on the other side inside the lifting box 9, a steel cable 14 is wound on the middle of the cable reel 12, one end of the steel cable 14 is fixedly connected to the cable reel 12, the other end of the steel cable 14 extends out of the bottom of the lifting box 9 and is fixedly connected with the lower side face of the lifting box 9, a lifting seat 10 is installed in the middle of the steel cable 14, a movable pulley 20 is installed in the middle of the upper side of the lifting seat 10, the middle of the steel cable 14 penetrates through the middle of the lifting seat 10 and is wound on the movable pulley 20, a transmission worm gear is installed at one end, close to the worm gear motor 13, of the cable reel 12, a transmission worm is fixedly connected to the end of a driving shaft of the worm gear motor 13, the transmission worm is meshed with the transmission worm gear, the transmission worm gear is driven by the worm gear motor 13 through rotating the transmission worm gear, drive cable drum 12 through the transmission worm wheel, carry out rolling and release to steel cable 14 through cable drum 12, thereby carry out ascending and descending in vertical side to movable pulley 20 through steel cable 14 and the wiring of movable pulley 20, and then go up and down handling seat 10 through movable pulley 20, the lower extreme fixedly connected with tensiometer 11 of handling seat 10, the lower extreme and the handling mechanism 4 of tensiometer 11 link to each other, can continuously learn the pulling force that steel box roof beam hoist and mount point bore through tensiometer 11, avoid the steel box roof beam atress unbalanced when hoist and mount, thereby level the steel box roof beam better, make the steel box roof beam keep steady hoist and mount.
The hoisting mechanism 4 comprises a supporting disk 15, the supporting disk 15 is kept horizontal, the upper surface of the supporting disk 15 is fixedly connected with a plurality of connecting columns 22 which are uniformly distributed at equal angles, the supporting disk 15 is fixedly connected with the lower end of the tension meter 11 through the connecting columns 22, a plurality of clamping rods 17 which are uniformly distributed at equal angles are embedded in the periphery of the supporting disk 15, the clamping rods 17 and the connecting columns 22 are arranged in a staggered manner, the supporting disk 15 is abutted against the side surface of the middle part of each clamping rod 17, a rotating shaft penetrates through the middle part of each clamping rod 17, each clamping rod 17 is rotatably connected with the supporting disk 15 through the corresponding rotating shaft, the middle part of the upper surface of the supporting disk 15 is fixedly connected with an electric push rod 16, the electric push rod 16 is vertically upward, a transmission rod 18 is arranged between the telescopic end of the electric push rod 16 and the upper end of each clamping rod 17, the two ends of the transmission rod 18 are respectively rotatably connected with the electric push rod 16 and the clamping rods 17, and the lower ends of the clamping rods 17 are fixedly connected with clamping hooks 19, the clamping hook 19 is inclined upwards, the included angle between the clamping hook 19 and the clamping rod 17 is eighty-five degrees to eighty degrees, and the upper end surface of the clamping hook 19 is concave downwards and is provided with a plurality of anti-skidding grooves;
during the centre gripping, through the shrink of electric push rod 16, thereby gather together each transfer line 18 to the centre, and then overturn each supporting rod 17 through transfer line 18, outwards strut through supporting rod 17 and make supporting rod 17 and clamping hook 19 cover on the hoist and mount piece of handling point, electric push rod 16 extends afterwards, to strutting each transfer line 18 all around, thereby gather together clamping hook 19, carry out the centre gripping to the hoist and mount piece through clamping hook 19, promote through vertical guiding mechanism afterwards, thereby promote the hoist and mount piece, and then carry out the handling to the steel box girder, and make the handling piece of each handling point of steel box girder remain stable and the balanced state of atress.
In the use process, the stepping motor 6 drives the transmission screw 8 to rotate, the transmission screw 8 pushes the transmission slide block 23 to move in the mounting box 5, the transmission slide block 23 pushes the lifting box 9, so that the vertical adjusting mechanism is pushed to move through the transmission slide block 23, the positions of the vertical adjusting mechanism and the lifting mechanism 4 are adjusted according to the position of a lifting point, the vertical adjusting mechanism is kept in a vertical state, the lifting mechanism 4 keeps vertically lifting the lifting block, the worm gear motor 13 drives the transmission worm gear through rotating the transmission worm, the cable disc 12 is driven through the transmission worm gear, the steel cable 14 is wound and released through the cable disc 12, the steel cable 14 is wound and connected with the movable pulley 20 to lift the movable pulley 20 in the vertical direction, the lifting seat 10 is lifted through the movable pulley 20, the lower end of the lifting seat 10 is fixedly connected with the tension meter 11, the tension borne by the hoisting point of the steel box girder can be continuously known through the tension meter 11, so that the steel box girder is leveled;
the shrink through electric putter 16, thereby gather together each transfer line 18 to the centre, and then overturn each supporting rod 17 through transfer line 18, outwards strut through supporting rod 17 and make supporting rod 17 and clamping hook 19 cover on the hoist and mount piece of handling point, electric putter 16 extends afterwards, to strutting each transfer line 18 all around, thereby gather together clamping hook 19, carry out the centre gripping to the hoist and mount piece through clamping hook 19, promote through vertical guiding mechanism afterwards, thereby promote the hoist and mount piece, and then carry out the handling to the steel box girder, and make the handling piece of each handling point of steel box girder remain stable and the balanced state of atress.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The steel box girder hoisting equipment with the automatic leveling function comprises crane frames (1), wherein the crane frames (1) are provided with two groups, two supporting bases (2) are installed at the bottoms of the crane frames (1), and the steel box girder hoisting equipment is characterized in that one side of the crane frames (1) is provided with a supporting plate (3), a plurality of horizontal adjusting mechanisms arranged side by side are embedded on the lower side surface of the supporting plate (3), each horizontal adjusting mechanism comprises an installation box (5), a vertical adjusting mechanism is installed on the lower side of each horizontal adjusting mechanism, a hoisting mechanism (4) is installed on the lower side of each vertical adjusting mechanism, hoisting blocks installed at a steel box girder hoisting point are clamped through the hoisting mechanisms (4), each vertical adjusting mechanism comprises a hoisting box (9) and a cable disc (12), and the cable disc (12) is installed on one side inside the hoisting box (9), the inside opposite side of handling box (9) is provided with worm gear motor (13), the middle part winding of cable dish (12) has wire rope (14), the one end fixed connection of wire rope (14) is on cable dish (12), and the other end of wire rope (14) stretch out the bottom of handling box (9) and with the downside fixed connection of handling box (9).
2. The steel box girder hoisting equipment with the automatic leveling function as claimed in claim 1, wherein the mounting box (5) and the stepping motor (6) are embedded on the lower surface of the supporting plate (3), the stepping motor (6) is fixedly mounted at one end of the mounting box (5), a transmission screw (8) is rotatably connected inside the mounting box (5), the end of a driving shaft of the stepping motor (6) penetrates through the side wall of the mounting box (5) and is fixedly connected with one end of the transmission screw (8), a transmission slide block (23) is sleeved on the transmission screw (8) in a threaded manner, and the transmission slide block (23) is slidably connected with the inner side wall of the mounting box (5).
3. The steel box girder hoisting equipment with the automatic leveling function as claimed in claim 2, wherein a plurality of through chutes (7) are formed in the lower side of the mounting box (5) and are distributed at equal intervals, connecting blocks are connected in the through chutes (7) in a sliding manner, and the transmission sliding blocks (23) are fixedly connected with the top of the hoisting box (9) of the vertical adjusting mechanism through the connecting blocks.
4. The steel box girder hoisting equipment with the automatic leveling function is characterized in that a hoisting seat (10) is installed in the middle of a steel cable rope (14), a movable pulley (20) is installed in the middle of the upper side of the hoisting seat (10), the middle of the steel cable rope (14) penetrates through the middle of the hoisting seat (10) and is wound on the movable pulley (20), a transmission worm wheel is installed at one end, close to a worm gear motor (13), of a cable rope disc (12), a transmission worm is fixedly connected to the end portion of a driving shaft of the worm gear motor (13), and the transmission worm is in meshing transmission with the transmission worm wheel.
5. The steel box girder hoisting equipment with the automatic leveling function as claimed in claim 4, wherein a tension meter (11) is fixedly connected to the lower end of the hoisting seat (10), and the lower end of the tension meter (11) is connected with the hoisting mechanism (4).
6. The steel box girder hoisting equipment with the automatic leveling function is characterized in that the hoisting mechanism (4) comprises a supporting disk (15), the upper surface of the supporting disk (15) is fixedly connected with a plurality of connecting columns (22) which are uniformly distributed at equal angles, the supporting disk (15) is fixedly connected with the lower end of the tension meter (11) through the connecting columns (22), and the periphery of the supporting disk (15) is embedded with a plurality of clamping rods (17) which are uniformly distributed at equal angles.
7. The steel box girder hoisting equipment with the automatic leveling function according to claim 6, wherein the clamping rods (17) are staggered with the connecting columns (22), the supporting disk (15) abuts against the middle side of the clamping rods (17), a rotating shaft is arranged in the middle of the clamping rods (17), and the clamping rods (17) are rotatably connected with the supporting disk (15) through the rotating shaft.
8. The steel box girder hoisting equipment with the automatic leveling function according to claim 6, wherein an electric push rod (16) is fixedly connected to the middle of the upper surface of the supporting plate (15), the electric push rod (16) is vertically upward, a transmission rod (18) is installed between the telescopic end of the electric push rod (16) and the upper end of each clamping rod (17), two ends of the transmission rod (18) are respectively rotatably connected with the electric push rod (16) and the clamping rod (17), and a clamping hook (19) is fixedly connected to the lower end of each clamping rod (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111651310.6A CN114348860A (en) | 2021-12-30 | 2021-12-30 | Steel box girder hoisting equipment with automatic leveling function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111651310.6A CN114348860A (en) | 2021-12-30 | 2021-12-30 | Steel box girder hoisting equipment with automatic leveling function |
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| CN114348860A true CN114348860A (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111651310.6A Pending CN114348860A (en) | 2021-12-30 | 2021-12-30 | Steel box girder hoisting equipment with automatic leveling function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117864927A (en) * | 2024-03-11 | 2024-04-12 | 山西路桥第六工程有限公司 | Steel reinforcement framework integral hoisting equipment |
-
2021
- 2021-12-30 CN CN202111651310.6A patent/CN114348860A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117864927A (en) * | 2024-03-11 | 2024-04-12 | 山西路桥第六工程有限公司 | Steel reinforcement framework integral hoisting equipment |
| CN117864927B (en) * | 2024-03-11 | 2024-05-24 | 山西路桥第六工程有限公司 | Steel reinforcement framework integral hoisting equipment |
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