CN112249880A

CN112249880A - Prefabricated steel beam hoisting accessory for building

Info

Publication number: CN112249880A
Application number: CN202011195839.7A
Authority: CN
Inventors: 齐嘉蕾
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-01-22

Abstract

The invention relates to the technical field of hoisting of prefabricated steel beams, in particular to a hoisting device for a prefabricated steel beam for a building, which comprises a steel beam, a placing mechanism, an adjusting mechanism, a fixing mechanism, a positioning mechanism and a hanging mechanism, wherein the placing mechanism is arranged on the steel beam; one end of the placing mechanism is in threaded connection with an adjusting mechanism, and the two adjusting mechanisms can be rotated clockwise or anticlockwise before the steel beams are placed, so that the placing space of the placing mechanism can be adjusted, and the steel beams with different sizes can be placed conveniently; the top of the placing mechanism is relatively connected with two fixing mechanisms in a sliding manner, opposite side walls of the two fixing mechanisms are both connected with positioning mechanisms in a sliding manner, and the fixing mechanisms are matched with the positioning mechanisms to fix the steel beam; two side walls of the placing mechanism are connected with two suspension mechanisms in a relative sliding mode, lifting of the whole structure is achieved, the positions of the two suspension mechanisms are adjustable, balance points can be found conveniently, and lifting is facilitated.

Description

Prefabricated steel beam hoisting accessory for building

Technical Field

The invention relates to the technical field of hoisting of prefabricated steel beams, in particular to a hoisting device for a prefabricated steel beam for buildings.

Background

Prefabrication is the pre-fabrication of all or most of the components (e.g. of a house) in a factory; i-steel, also known as steel beam, is a long steel bar having an i-shaped cross section. The I-steel includes common I-steel and light I-steel. Is section steel with the cross section in an I shape; the I-beams are mainly divided into common I-beams, light I-beams and wide-flange I-beams. The wide-flange I-steel is divided into wide-flange I-steel, medium-flange I-steel and narrow-flange I-steel according to the height ratio of the flange to the web. The former two are produced in a specification of 10-60, i.e. the corresponding height is 10-60 cm. Under the same height, the light I-steel has narrow flange, thin web and light weight. The wide flange I-steel is also called H-shaped steel, and the section is characterized in that two legs are parallel and the inner sides of the legs have no inclination.

The existing prefabricated I-steel in a building is usually placed on a supporting plate when being lifted, the I-steel on the supporting plate is fixed through a fixing mechanism, a steel wire rope of a lifting device is fixed on the supporting plate to lift the I-steel, a placing groove on a placing plate for placing the I-steel is fixed in position and is difficult to place the I-steel with different sizes, the I-steel with the same model can only be lifted, the position of the steel wire rope at the supporting plate is difficult to adjust before the I-steel is lifted, the placing plate is easy to incline when the I-steel is lifted, and the lifting stability is influenced.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a prefabricated steel beam hoisting device for a building.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a prefabricated steel beam hoisting accessory for building, includes girder steel, placement mechanism, adjustment mechanism, fixed establishment, positioning mechanism and hangs the mechanism for place the I-steel placement mechanism's inside has been placed the girder steel, placement mechanism's the relative threaded connection of one end has two adjustment mechanism, two adjustment mechanism's one end all with rotate between the placement mechanism and connect, placement mechanism's both ends top department relative sliding connection has two fixed establishment, two fixed establishment's the equal sliding connection of relative lateral wall has and is located the girder steel top positioning mechanism, two positioning mechanism's one end respectively with two fixed establishment's bottom roll connection, two equal sliding connection of lateral wall of placement mechanism is used for hanging fixedly to whole mechanism hang the mechanism.

Specifically, place the mechanism and include standing groove, first rack, bottom plate, spout, second rack and roller bearing, the girder steel place in first rack the second place a top the inside of standing groove, first rack weld in the surface of bottom plate, the surface of bottom plate has been seted up the spout, second rack sliding connection in the inside of spout, the inside of first rack the inside of second rack all roll connection have the roller bearing, first rack the cross-section of second rack is "U" font structure.

Specifically, adjustment mechanism includes plectrum, lead screw, push pedal and movable groove, the inside level of bottom plate has been seted up the movable groove, the inside of bottom plate be equipped with sliding connection between the movable groove the push pedal, the bottom of second rack with the top welding of push pedal, the relative threaded connection of one of them lateral wall of bottom plate has two the lead screw, be located two in the bottom plate outside the tip of lead screw all welded the plectrum, the other both ends of lead screw respectively with rotate between the push pedal and be connected.

Specifically, fixed establishment includes slide bar, dwang, walking groove and side channel, the top border department of first rack the top border department of second rack relative sliding connection has the walking groove, two cross-sections are "T" shape structure the slide bar sliding connection respectively in two the inside in walking groove, two the relative lateral wall of slide bar has been seted up relatively the side channel, two the top threaded connection of slide bar has the dwang.

Specifically, the positioning mechanism comprises cross rods, adjusting rods, a pressure plate, a rubber plate, sliding columns, steel balls and springs, the sliding columns in cylindrical structures are connected to the insides of the two sliding rods in a sliding mode, the steel balls in rolling connection with the bottoms of the rotating rods are arranged on the tops of the two sliding columns in an annular array mode, the two cross rods extend into the insides of the sliding rods respectively, and two the horizontal pole respectively with two the lateral wall welding of traveller, and two are located girder steel top side the horizontal pole with two sliding connection between the side channel, two the equal threaded connection in surface of horizontal pole with the slide bar is parallel, be located the girder steel top adjust the pole, two the bottom of adjusting the pole all welds the pressure disk, two the bottom of pressure disk all bonds the rubber slab, two the traveller with all the centre gripping has between the slide bar the spring.

The hanging mechanism comprises moving blocks, fixing seats, limiting plates, steel wire ropes, partition plates and moving grooves, the moving grooves with I-shaped cross sections are formed in the opposite side walls of the second placing frame, the moving blocks are connected to the inside of the moving grooves in a sliding mode respectively and are welded to the opposite side walls of the moving blocks, the fixing seats and the moving blocks are connected to one ends of the fixing seats in a rotating mode, the limiting plates are connected to the one ends of the fixing seats in a deviating mode, the two ends of the limiting plates deviate from one ends of the fixing seats, the steel wire ropes are fixedly connected to the end portions of the limiting plates, the first placing frame and the opposite side walls of the second placing frame are welded in the equidistant mode and located on the partition plates at the moving grooves, and the limiting plates.

The invention has the beneficial effects that:

(1) according to the prefabricated steel beam hoisting device for the building, one end of the placing mechanism is in threaded connection with the adjusting mechanism, and the two adjusting mechanisms can be rotated clockwise or anticlockwise before steel beams are placed, so that the placing space of the placing mechanism can be adjusted, and the steel beams with different sizes can be placed conveniently; namely: when steel beams with different sizes are placed, the sizes of the steel beams are determined, the two shifting pieces are rotated at the same time, so that the lead screws are rotated in the bottom plate, one ends of the two lead screws, which are far away from the shifting pieces, push or pull the push plate, the push plate slides in the movable groove, the second placing frame is far away from or close to the first placing frame, and the steel beams with different sizes are placed in the placing grooves in the first placing frame and the second placing frame; invert the girder steel when placing the girder steel of I-shaped structure, the girder steel of I-shaped structure is "H" shape structure so, insert first rack with two bottoms of girder steel, the inside of the standing groove at second place a roof portion, first rack and second rack are realized supporting the girder steel, so the bottom plate realizes supporting first rack, the second rack supports, so the second rack can slide in the inside of the spout on bottom plate surface, realized placing not unidimensional girder steel, can roll between girder steel and the roller bearing when placing the girder steel, make things convenient for the transport of girder steel, place the back with the girder steel not roll with the roller bearing, take place the skew when avoiding the girder steel to lift by crane.

(2) According to the prefabricated steel beam hoisting device for the building, the top of the placing mechanism is relatively connected with two fixing mechanisms in a sliding manner, opposite side walls of the two fixing mechanisms are both connected with positioning mechanisms in a sliding manner, and the fixing mechanisms are matched with the positioning mechanisms to fix the steel beam; namely: the sliding rod is slid to a position where the placement of the steel beams is not influenced before the placement of the steel beams, the sliding rod can be moved after the placement is finished, the sliding rod can slide in the two walking grooves, the positioning mechanism can fix the first placing frame and the second placing frame at different positions of the steel beams, the rotating rod can be rotated to adjust the height of the cross rod, and the steel beams with different heights can be fixed; the rotatory dwang has realized that the dwang extrudees the horizontal pole to the top direction of girder steel after adjusting the position of slide bar, and then realized the spring compression, further rotation is adjusted the pole and has been realized adjusting the top direction removal of pole to the girder steel, the pressure disk that has realized two regulation pole bottoms so removes to the top direction of girder steel, and then realized that the rubber slab contradicts the girder steel, finally realized fixing the girder steel, the girder steel rocks when avoiding lifting by crane, the steel ball rolls with adjusting between the pole when rotating the regulation pole, reduce friction.

(3) According to the prefabricated steel beam hoisting device for the building, two side walls of the placing mechanism are connected with the two suspension mechanisms in a relatively sliding mode, so that the whole structure is hoisted, and the two suspension mechanisms are adjustable in position, so that a balance point can be found conveniently, and hoisting is facilitated; namely: the first rack is held after the steel beam is fixed, the limiting plate inside the moving groove is located at the second rack, four moving blocks are distributed in a rectangular array mode, the limiting plate is held to adjust the position of the moving blocks inside the moving groove, the steel wire rope is pulled after the position of the moving blocks is determined, the limiting plate is clamped between the two partition plates, the sliding of the moving blocks inside the moving groove during lifting is avoided, the phenomenon that whether the whole body is balanced or not can be observed through pre-lifting, if the position of the moving blocks is unbalanced and readjusted, the limiting plate is separated from the partition plates after the position of conveying is reached, the adjusting rod is separated from the steel beam, and the steel beam can be.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural diagram of an overall structure of a preferred embodiment of a prefabricated steel beam hoisting device for buildings according to the present invention;

FIG. 2 is an enlarged view of the part A shown in FIG. 1;

FIG. 3 is a schematic view of the connection structure of the steel beam, the placing mechanism, the adjusting mechanism, the fixing mechanism and the positioning mechanism shown in FIG. 2;

FIG. 4 is an enlarged view of the structure of the portion B shown in FIG. 3;

FIG. 5 is an enlarged view of the structure of the portion D shown in FIG. 4;

fig. 6 is an enlarged schematic view of the structure of the portion C shown in fig. 3.

In the figure: 1. the steel beam, 2, a placing mechanism, 21, a placing groove, 22, a first placing frame, 23, a bottom plate, 24, a sliding groove, 25, a second placing frame, 26, a rolling shaft, 3, an adjusting mechanism, 31, a shifting piece, 32, a screw rod, 33, a push plate, 34, a movable groove, 4, a fixing mechanism, 41, a sliding rod, 42, a rotating rod, 43, a walking groove, 44, a side groove, 5, a positioning mechanism, 51, a cross rod, 52, an adjusting rod, 53, a pressure plate, 54, a rubber plate, 55, a sliding column, 56, a steel ball, 57, a spring, 6, a hanging mechanism, 61, a moving block, 62, a fixed seat, 63, a limiting plate, 64, a steel wire rope, 65, a partition plate, 66 and a moving groove.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1-6, the prefabricated steel beam hoisting device for buildings of the invention comprises a steel beam 1, a placing mechanism 2, an adjusting mechanism 3, a fixing mechanism 4, a positioning mechanism 5 and a hanging mechanism 6, the steel beam 1 is placed in the placing mechanism 2 for placing the I-steel, one end of the placing mechanism 2 is oppositely connected with two adjusting mechanisms 3 through threads, one end of each adjusting mechanism 3 is rotatably connected with the placing mechanism 2, the tops of the two ends of the placing mechanism 2 are relatively connected with two fixing mechanisms 4 in a sliding way, the opposite side walls of the two fixing mechanisms 4 are respectively connected with the positioning mechanism 5 positioned at the top of the steel beam 1 in a sliding way, one end of each of the two positioning mechanisms 5 is respectively connected with the bottoms of the two fixing mechanisms 4 in a rolling way, two side walls of the placing mechanism 2 are both connected with the hanging mechanism 6 used for hanging and fixing the whole mechanism in a sliding manner.

Specifically, the placing mechanism 2 includes a placing groove 21, a first placing rack 22, a bottom plate 23, a sliding groove 24, a second placing rack 25 and a rolling shaft 26, the steel beam 1 is placed inside the placing groove 21 at the top of the first placing rack 22 and the top of the second placing rack 25, the first placing rack 22 is welded on the surface of the bottom plate 23, the sliding groove 24 is formed on the surface of the bottom plate 23, the second placing rack 25 is slidably connected inside the sliding groove 24, the rolling shaft 26 is connected inside the first placing rack 22 and inside the second placing rack 25 in a rolling manner, the cross sections of the first placing rack 22 and the second placing rack 25 are of a U-shaped structure, the steel beam 1 is inverted when the steel beam 1 of the I-shaped structure is placed, the steel beam 1 of the I-shaped structure is of an H-shaped structure, and the two bottoms of the steel beam 1 are inserted into the first placing rack 22, Inside the standing groove 21 at the top of the second placing frame 25, the first placing frame 22 and the second placing frame 25 are used for supporting the steel beam 1, the bottom plate 23 is used for supporting the first placing frame 22 and the second placing frame 25, the second placing frame 25 can slide in the sliding groove 24 on the surface of the bottom plate 23, the steel beam 1 with different sizes can be placed, the steel beam 1 can roll between the steel beam 1 and the roller 26 when placed, the steel beam is convenient to carry, the steel beam 1 does not roll with the roller 26 after being placed, and the steel beam 1 is prevented from being shifted when lifted.

Specifically, the adjusting mechanism 3 includes a shifting piece 31, a screw rod 32, a push plate 33 and a movable groove 34, the movable groove 34 is horizontally formed in the bottom plate 23, the push plate 33 slidably connected with the movable groove 34 is arranged in the bottom plate 23, the bottom of the second rack 25 is welded to the top of the push plate 33, two screw rods 32 are oppositely and threadedly connected to one side wall of the bottom plate 23, the shifting piece 31 is welded to the end portions of the two screw rods 32 located outside the bottom plate 23, the other two ends of the screw rod 32 are rotatably connected with the push plate 33 respectively, when the steel beams 1 with different sizes are placed, the size of the steel beam 1 is determined, the screw rod 32 is rotated inside the bottom plate 23 by rotating the two shifting pieces 31 simultaneously, and then one end of the two screw rods 32 departing from the shifting piece 31 pushes or pulls the push plate 33, the push plate 33 slides in the movable groove 34, and the second placing frame 25 is far away from or close to the first placing frame 22, so that the steel beams with different sizes are placed in the placing grooves 21 in the first placing frame 22 and the second placing frame 25.

Specifically, the fixing mechanism 4 includes a sliding bar 41, a rotating bar 42, a traveling groove 43 and a side groove 44, the top edge of the first rack 22 and the top edge of the second rack 25 are connected with the traveling groove 43 in a relatively sliding manner, the two sliding bars 41 with inverted "T" shaped cross sections are respectively connected in the two traveling grooves 43 in a sliding manner, the side grooves 44 are oppositely formed on the two sliding bars 41, the top portions of the two sliding bars 41 are connected with the rotating bar 42 in a threaded manner, the sliding bars 41 are slid to positions where the steel beam 1 is not affected before the steel beam 1 is placed, the sliding bars 41 can be moved after the placement is completed, the sliding bars 41 slide in the two traveling grooves 43, and the positioning mechanism 5 is further implemented to align the steel beam 1 at different positions on the first rack 22 and the steel beam 1, The second placing frame 25 is fixed and can rotate the rotating rod 42 to adjust the height of the cross rod 51, so that the steel beam 1 with different heights can be fixed.

Specifically, the positioning mechanism 5 includes a cross bar 51, an adjusting bar 52, a pressure plate 53, a rubber plate 54, sliding columns 55, steel balls 56 and a spring 57, the sliding columns 55 with cylindrical structures are slidably connected to the insides of the two sliding bars 41, the steel balls 56 connected to the bottoms of the rotating bars 42 in a rolling manner are arranged on the tops of the two sliding columns 55 in an annular array, the two cross bars 51 extend to the insides of the sliding bars 41 respectively, the two cross bars 51 are welded to the side walls of the two sliding columns 55 respectively, the two cross bars 51 located on the top side of the steel beam 1 are slidably connected to the two side grooves 44, the adjusting bar 52 parallel to the sliding bars 41 and located on the top of the steel beam 1 is in threaded connection with the surfaces of the two cross bars 51, the pressure plate 53 is welded to the bottoms of the two adjusting bars 52, the rubber plate 54 is bonded to the bottoms of the two adjusting bars 53, the springs 57 are clamped between the two sliding columns 55 and the sliding rods 41, the position of each sliding rod 41 is adjusted, then the rotating rod 42 is rotated to extrude the cross rod 51 towards the top of the steel beam 1, the springs 57 are compressed, the adjusting rod 52 is further rotated to move the adjusting rod 52 towards the top of the steel beam 1, then the pressure plate 53 at the bottom of the two adjusting rods 52 moves towards the top of the steel beam 1, the rubber plate 54 abuts against the steel beam 1, and finally the steel beam 1 is fixed, so that the steel beam 1 is prevented from shaking during lifting, the steel balls 56 roll with the adjusting rod 52 when the adjusting rod 52 is rotated, and friction is reduced.

Specifically, the hanging mechanism 6 includes moving blocks 61, fixing seats 62, limiting plates 63, wire ropes 64, partition plates 65 and moving grooves 66, the moving grooves 66 with i-shaped cross sections are respectively formed on the opposite side walls of the first rack 22 and the second rack 25, the two moving blocks 61 are respectively slidably connected inside the two moving grooves 66, the fixing seats 62 are respectively welded on the opposite side walls of the two moving blocks 61, the limiting plates 63 are respectively rotatably connected to one ends of the two fixing seats 62, the wire ropes 64 are respectively fixedly connected to the end portions of the two limiting plates 63 which are away from one end of the fixing seats 62, the partition plates 65 located at the moving grooves 66 are equidistantly welded on the opposite side walls of the first rack 22 and the second rack 25, and the limiting plates 63 are clamped between the two partition plates 65, after the steel beam is fixed, the limiting plates 63 in the moving grooves 66 at the positions of the first placing frame 22 and the second placing frame 25 are held, four moving blocks 61 are distributed in a rectangular array, the limiting plates 63 are held to adjust the positions of the moving blocks 61 in the moving grooves 66, the steel wire ropes 64 are pulled after the positions of the moving blocks 61 are determined, the limiting plates 63 are clamped between the two partition plates 65, the moving blocks 61 are prevented from sliding in the moving grooves 66 during lifting, the whole body can be lifted in advance to observe whether balance exists, if the positions of the moving blocks 61 are not adjusted again, the limiting plates 63 are separated from the partition plates 65 after the positions of conveying are reached, the adjusting rods 52 are separated from the steel beam 1, and the steel beam 1 is taken down.

When the steel beam placing device is used, firstly, when steel beams 1 with different sizes are placed, the size of the steel beam 1 is determined, the two shifting pieces 31 are rotated simultaneously, so that the screw rod 32 rotates in the bottom plate 23, one end of the two screw rods 32, which is far away from the shifting pieces 31, pushes or pulls the push plate 33, the push plate 33 slides in the movable groove 34, the second placing frame 25 is far away from or close to the first placing frame 22, and the steel beams with different sizes are placed in the placing grooves 21 in the first placing frame 22 and the second placing frame 25; the steel beam 1 is inverted when the steel beam 1 with the I-shaped structure is placed, then the steel beam 1 with the I-shaped structure is in an H-shaped structure, two bottoms of the steel beam 1 are inserted into the placing grooves 21 at the tops of the first placing frame 22 and the second placing frame 25, the first placing frame 22 and the second placing frame 25 support the steel beam 1, then the bottom plate 23 supports the first placing frame 22 and the second placing frame 25, then the second placing frame 25 can slide in the sliding grooves 24 on the surface of the bottom plate 23, placing of the steel beams 1 with different sizes is achieved, the steel beam 1 and the rolling shaft 26 can roll when the steel beam 1 is placed, carrying of the steel beam is facilitated, the steel beam 1 does not roll with the rolling shaft 26 after placing, and deviation when the steel beam 1 is lifted is avoided; then, before the steel beam 1 is placed, the sliding rod 41 is slid to a position where the placement of the steel beam 1 is not affected, after the placement is completed, the sliding rod 41 can be moved, the sliding rod 41 can slide in the two walking grooves 43, the positioning mechanism 5 can fix the first placing frame 22 and the second placing frame 25 at different positions of the steel beam 1, the rotating rod 42 can be rotated to adjust the height of the cross rod 51, and the steel beams 1 with different heights can be fixed; after the position of the sliding rod 41 is adjusted, the rotating rod 42 is rotated to extrude the cross rod 51 towards the top of the steel beam 1 through the rotating rod 42, so that the compression of the spring 57 is realized, the adjustment rod 52 is further rotated to move towards the top of the steel beam 1, so that the pressure plates 53 at the bottoms of the two adjustment rods 52 move towards the top of the steel beam 1, the steel beam 1 is abutted through the rubber plates 54, the steel beam 1 is finally fixed, the steel beam 1 is prevented from shaking during hoisting, the steel balls 56 roll with the adjustment rods 52 when the adjustment rods 52 are rotated, and the friction is reduced; finally, after the steel beam is fixed, the limiting plates 63 inside the moving grooves 66 of the first placing frame 22 and the second placing frame 25 are held, four moving blocks 61 are distributed in a rectangular array, the limiting plates 63 are held to adjust the positions of the moving blocks 61 inside the moving grooves 66, the steel wire ropes 64 are pulled after the positions of the moving blocks 61 are determined, the limiting plates 63 are clamped between the two partition plates 65, the sliding of the moving blocks 61 inside the moving grooves 66 during lifting is avoided, pre-lifting can be carried out to observe whether the whole body is balanced, if the positions of the moving blocks 61 are not balanced and adjusted again, the limiting plates 63 are separated from the partition plates 65 after the conveying positions are reached, the adjusting rods 52 are separated from the steel beam 1, and the steel beam 1 is taken down.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The prefabricated steel beam hoisting device for the building is characterized by comprising a steel beam (1), a placing mechanism (2), adjusting mechanisms (3), fixing mechanisms (4), positioning mechanisms (5) and a hanging mechanism (6), wherein the steel beam (1) is placed inside the placing mechanism (2) for placing I-shaped steel, one end of the placing mechanism (2) is connected with the two adjusting mechanisms (3) in a threaded manner, one end of each adjusting mechanism (3) is rotatably connected with the placing mechanism (2), the tops of the two ends of the placing mechanism (2) are relatively connected with the two fixing mechanisms (4) in a sliding manner, the opposite side walls of the two fixing mechanisms (4) are respectively connected with the positioning mechanisms (5) positioned at the top of the steel beam (1) in a sliding manner, one ends of the two positioning mechanisms (5) are respectively connected with the bottoms of the two fixing mechanisms (4) in a rolling manner, two side walls of the placing mechanism (2) are both connected with the hanging mechanism (6) used for hanging and fixing the whole mechanism in a sliding mode.

2. The prefabricated steel beam hoisting device for buildings according to claim 1, wherein: placing mechanism (2) includes standing groove (21), first rack (22), bottom plate (23), spout (24), second rack (25) and roller bearing (26), place in first rack (22) second rack (25) top the inside of standing groove (21), first rack (22) weld in the surface of bottom plate (23), the surface of bottom plate (23) has been seted up spout (24), second rack (25) sliding connection in the inside of spout (24), the inside of first rack (22), the inside of second rack (25) all roll connection have roller bearing (26), the cross-section of first rack (22), second rack (25) is "U" font structure.

3. The prefabricated steel beam hoisting device for buildings according to claim 2, wherein: adjustment mechanism (3) are including plectrum (31), lead screw (32), push pedal (33) and activity groove (34), the inside level of bottom plate (23) has been seted up activity groove (34), the inside of bottom plate (23) be equipped with sliding connection between activity groove (34) push pedal (33), the bottom of second rack (25) with the top welding of push pedal (33), the relative threaded connection of one of them lateral wall of bottom plate (23) has two lead screw (32), is located two in the bottom plate (23) outside the tip of lead screw (32) all has welded plectrum (31), the other both ends of lead screw (32) respectively with rotate between push pedal (33) and be connected.

4. The prefabricated steel beam hoisting device for buildings according to claim 2, wherein: fixed establishment (4) include slide bar (41), dwang (42), walking groove (43) and side channel (44), the top border department of first rack (22) the top border department relative sliding connection of second rack (25) has walking groove (43), two cross-sections are "T" shape structure slide bar (41) sliding connection respectively in two the inside of walking groove (43), two the relative lateral wall of slide bar (41) has been seted up relatively side channel (44), two the top threaded connection of slide bar (41) has dwang (42).

5. The prefabricated steel beam hoisting device for buildings according to claim 4, wherein: the positioning mechanism (5) comprises cross rods (51), adjusting rods (52), a pressure plate (53), a rubber plate (54), sliding columns (55), steel balls (56) and springs (57), the sliding columns (55) which are of cylindrical structures are connected inside the two sliding rods (41) in a sliding mode, the steel balls (56) which are connected with the bottom of the rotating rod (42) in a rolling mode are arranged at the tops of the two sliding columns (55) in an annular array mode, the two cross rods (51) extend into the sliding rods (41) respectively, the two cross rods (51) are welded with the side walls of the two sliding columns (55) respectively, the two cross rods (51) which are located on the top side of the steel beam (1) are connected with the two side grooves (44) in a sliding mode, the adjusting rods (52) which are parallel to the sliding rods (41) and located on the top of the steel beam (1) are in threaded connection with the surfaces of the two cross rods (51), the bottom of two adjust pole (52) all welds pressure disk (53), two the bottom of pressure disk (53) all bonds and has rubber slab (54), two traveller (55) with all the centre gripping has between slide bar (41) spring (57).

6. The prefabricated steel beam hoisting device for buildings according to claim 2, wherein: the suspension mechanism (6) comprises moving blocks (61), fixing seats (62), limiting plates (63), steel wire ropes (64), partition plates (65) and moving grooves (66), the opposite side walls of the first placing frame (22) and the second placing frame (25) are respectively provided with the moving grooves (66) with I-shaped cross sections, the two moving blocks (61) are respectively connected inside the two moving grooves (66) in a sliding manner, the fixing seats (62) are respectively welded on the opposite side walls of the two moving blocks (61), one ends of the two fixing seats (62) are respectively connected with the limiting plates (63) in a rotating manner, the end parts of the limiting plates (63) which are far away from one ends of the fixing seats (62) are respectively fixedly connected with the steel wire ropes (64), and the opposite side walls of the first placing frame (22) and the second placing frame (25) are equidistantly welded with the partition plates (65) which are positioned at the moving grooves (66), the limiting plate (63) is clamped between the two partition plates (65).