A device for lifting heavy objects in a narrow space

Abstract

The present application relates to the technical field of cranes, and provides a device for hoisting heavy objects in a narrow space, in which a lifting motor, a drum, and a steel frame column are all fixedly installed on a steel platform; the boom is installed on the steel frame column through a lifting and steering device; at least three casters are installed at the lower end of the steel platform; the steel frame platform is fixedly installed in the middle of the upper end surface of the profile structure, and the distance between the two sides of the steel frame platform and the two sides of the profile structure is 1 / 5 of the width of the profile structure; the lifting motor is fixedly installed on the upper end surface of the profile structure; the drum is fixedly installed on the upper end surface of the profile structure; a first fixed pulley and a second fixed pulley are arranged on the steel frame platform; one end of the vertical arm of the boom is fixedly installed on the steel frame column through the lifting and steering device, and the other end is fixedly connected to one end of the cross arm; a third fixed pulley is arranged at the connecting portion of the vertical arm and the cross arm, and a fourth fixed pulley is arranged at the protruding end of the cross arm.

Description

Technical Field

[0001] The present application relates to the technical field of cranes, and in particular to a device for hoisting heavy objects in a narrow space. Background Art

[0002] The existing small hoisting machines require complex assembly and a large operating space during use. When hoisting in a small space, they are often unable to achieve the desired effect due to the limitations of the rotation radius and space size. In the conventional hoisting process, only a single fixed pulley is used to lift the heavy objects through the lifting motor. This hoisting method has a high hoisting position and low efficiency. After one hoisting, it is often necessary to readjust the hoisting position before it can be hoisted again, which greatly slows down the construction process.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0004] The purpose of this application is to provide a device for hoisting heavy objects in a narrow space to solve or alleviate the problems existing in the above-mentioned prior art.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] The present application provides a device for lifting heavy objects in a narrow space, comprising: a movable steel platform, a lifting motor, a drum, a steel frame column and a boom; the lifting motor, the drum and the steel frame column are all fixedly mounted on the steel platform; the boom is mounted on the steel frame column through a lifting and steering device; the cross-section of the steel platform is a square shape, and at least three casters are installed on the lower end surfaces of the two side plates of the square structure; the steel frame platform is fixedly mounted on the middle part of the upper end surface of the square structure, and the distance between the two sides of the steel frame platform and the two sides of the square structure is 1 / 5 of the width of the square structure; the lifting motor is fixedly mounted on the upper end surface of the square structure through a lifting motor bracket, and is located on the inner side of the steel frame platform; the drum is fixedly mounted on the upper end surface of the square structure through a drum bracket, is located on the inner side of the steel frame platform and is symmetrically arranged with the lifting motor; a first fixed pulley and a second fixed pulley are provided on the steel frame platform, and the The first fixed pulley is located directly above the lifting motor, and the second fixed pulley is located above the drum and located on the outside of the steel frame platform; the first fixed pulley and the second fixed pulley are located at the same height; the boom comprises: a vertical arm and a horizontal arm, one end of the vertical arm is fixedly mounted on the steel frame column through the lifting and steering device, the other end of the vertical arm is fixedly connected to one end of the horizontal arm, and the horizontal arm is in a horizontal state; a third fixed pulley is provided at the fixed connection portion between the vertical arm and the horizontal arm, and a fourth fixed pulley is provided at the protruding end of the horizontal arm; the third fixed pulley and the fourth fixed pulley are located at the same height and are both located below the horizontal arm; the third fixed pulley is located directly above the second fixed pulley; wherein, the wire rope on the drum is fixedly connected to the hook after passing through the lifting motor, the first fixed pulley, the second fixed pulley, the third fixed pulley and the fourth fixed pulley in sequence, so as to lift heavy objects under the drive of the lifting motor.

[0007] Preferably, the steel frame columns include: two side columns and a top cross beam, the lower ends of the two side columns are symmetrically arranged along the length direction of the steel platform and fixedly connected to the upper end surface of the profiled structure, and the two ends of the top cross beam are respectively fixedly connected to the upper ends of the two side columns.

[0008] Preferably, the side column is a triangular structure, the bottom side of the triangular structure is fixedly connected to the upper end surface of the shaped structure, and the upper vertex of the triangular structure is fixedly connected to the end of the top crossbeam.

[0009] Preferably, the lower end of the vertical arm is installed on the top cross beam through the lifting and steering device, and is opposite to the upper vertex of the triangular structure.

[0010] Preferably, the lifting motor, the drum, the second fixed pulley, the third fixed pulley, and the top crossbeam are all located in the same vertical plane.

[0011] Preferably, a counterweight block is further provided on the upper surface of the shaped structure, and the counterweight blocks are symmetrically arranged on both sides of the steel frame column and abut against the steel frame platform.

[0012] Preferably, the upper panel of the shaped structure is formed by welding a plurality of platform steel beams in a U-shape, and the spacing between two adjacent platform steel beams is 1500 mm.

[0013] Preferably, the diameters of the first fixed pulley, the third fixed pulley and the fourth fixed pulley are the same, which are all 200 mm; and the diameter of the second fixed pulley is 80 mm.

[0014] Preferably, the upper end of the steel frame column is a tubular structure, and the vertical arm is inserted into the cylindrical space of the tubular structure; correspondingly, the lifting and steering device includes: a lifting hydraulic cylinder and a steering assembly, and the two parts of the lifting hydraulic cylinder that can move telescopically relative to each other are respectively fixedly connected to the vertical arm and the steel frame column to drive the vertical arm to move telescopically in the tubular space along the vertical direction; the tubular structure is connected to the lower structure of the steel frame column through the steering assembly to drive the tubular structure and the lower structure of the steel frame column to rotate relative to each other.

[0015] Preferably, the equipment for lifting heavy objects in a narrow space also includes: a maintenance ladder; the lower end of the maintenance ladder is fixed to the upper end surface of the shaped structure, the upper end of the maintenance ladder is abutted against the steel frame column, and is located below the lifting and steering device, for assisting the maintenance of the lifting and steering device.

[0016] Beneficial effects:

[0017] In the technical solution provided in the present application, a lifting motor, a drum, and a steel frame column are deployed on a movable steel platform, and the boom is installed on the steel frame column through a lifting and steering device. This not only enables the equipment to be moved in a narrow space, but also enables the lifting of heavy objects in different horizontal spaces and at different heights through the rotation and lifting of the boom. Multiple heavy objects within a certain range can be lifted in sequence without moving the equipment.

[0018] The cross-section of the steel platform is designed to be a Z-shaped structure, and at least three casters are installed on the lower sections of the two side plates of the Z-shaped structure. This ensures the overall stability of the equipment and facilitates the walking and transfer of the equipment. The steel frame platform is fixedly installed in the middle of the upper end surface of the Z-shaped structure, and the distance between the two sides of the steel frame platform and the two sides of the Z-shaped structure is 1 / 5 of the width of the Z-shaped structure. The center of gravity of the equipment is as close to the middle as possible, further effectively improving the overall stability of the equipment.

[0019] Furthermore, by fixing the lifting motor bracket and the reel on the upper end surface of the shaped structure, and the lifting motor and the reel are both located on the inner side of the steel frame platform, and at the same time, the lifting motor and the reel are arranged symmetrically, the center of gravity of the equipment is further moved closer to the middle, making the lifting of heavy objects safer and improving the overall stability of the equipment.

[0020] The first fixed pulley, the second fixed pulley, the third fixed pulley and the fourth fixed pulley are used to realize the steering of power transmission, thereby improving the power transmission efficiency and reducing the power loss; at the same time, the first fixed pulley is located above the lifting motor, the second fixed pulley is located above the drum, the third fixed pulley is located above the second fixed pulley, the first fixed pulley and the second fixed pulley are displaced at the same height, and the third fixed pulley and the fourth fixed pulley are displaced at the same height, thereby effectively ensuring that the driving force of the lifting motor is transmitted in the horizontal or numerical direction during the lifting of heavy objects, which not only improves the force transmission efficiency, but also makes the force working condition of the equipment better, reduces the friction and wear of each component, and prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. Among them:

[0022] Figure 1 A front view of a device for hoisting heavy objects in a narrow space provided according to some embodiments of the present application;

[0023] Figure 2 for Figure 1 A left side view of the device for lifting heavy objects in a narrow space according to the illustrated embodiment.

[0024] Description of reference numerals:

[0025] 101-steel platform; 102-steel frame column; 103-boom; 104-lifting motor; 105-reel; 106-castor; 107-hook; 108-lifting and steering device; 109-counterweight; 201-first fixed pulley; 202-second fixed pulley; 203-third fixed pulley; 204-fourth fixed pulley; 205-wire rope; 112-side column;

[0026] 113-vertical arm; 123-transverse arm; 118-rocker arm; 128-driving gear; 138-driven gear;

[0027] 301-maintenance ladder; 302-drive motor; 303-power battery; 304-hydraulic station; 305-hydraulic pipeline. DETAILED DESCRIPTION

[0028] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present application includes such modifications and variations within the scope of the appended claims and their equivalents.

[0029] In the description of this application, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and do not require that this application must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. The terms "connected", "connected", and "set" used in this application should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] like Figure 1 , Figure 2 As shown, the equipment used for lifting heavy objects in a narrow space includes: a movable steel platform 101, a lifting motor 104, a drum 105, a steel frame column 102 and a boom 103; the lifting motor 104, the drum 105, and the steel frame column 102 are all fixedly installed on the steel platform 101; the boom 103 is installed on the steel frame column 102 through a lifting and steering device 108.

[0031] The cross section of the steel platform 101 is a square shape, and at least three casters 106 are installed on the lower end surfaces of the two side plates of the square structure; the steel frame platform is fixedly installed in the middle of the upper end surface of the square decoupling strand, and the distance between the two sides of the steel frame platform and the two sides of the square structure is 1 / 4 of the width of the square structure. The lifting motor 104 is fixedly installed on the upper end surface of the square structure through the lifting motor 104 bracket, and is located on the inner side of the steel frame platform; the reel 105 is fixedly installed on the upper end surface of the square structure through the reel 105 bracket, located on the inner side of the steel frame platform and symmetrically arranged with the lifting motor 104. The first fixed pulley 201 and the second fixed pulley 202 are arranged on the steel frame platform, and the first fixed pulley 201 is located directly above the lifting motor 104, and the second fixed pulley 202 is located above the reel 105 and located on the outer side of the steel frame platform; the first fixed pulley 201 and the second fixed pulley 202 are located at the same height.

[0032] The boom 103 includes: a vertical arm 113 and a horizontal arm 123, one end of the vertical arm 113 is fixedly installed on the steel frame column 102 through the lifting and steering device 108, the other end of the vertical arm 113 is fixedly connected to one end of the horizontal arm 123, and the horizontal arm 123 is in a horizontal state; a third fixed pulley 203 is provided at the fixed connection portion of the vertical arm 113 and the horizontal arm 123, and a fourth fixed pulley 204 is provided at the extended end of the horizontal arm 123; the third fixed pulley 203 and the fourth fixed pulley 204 are located at the same height and are both located below the horizontal arm 123; the third fixed pulley 203 is located directly above the second fixed pulley 202; wherein, the wire rope 205 on the drum 105 is fixedly connected to the hook 107 after passing through the lifting motor 104, the first fixed pulley 201, the second fixed pulley 202, the third fixed pulley 203, and the fourth fixed pulley 204 in sequence, so as to lift heavy objects under the drive of the lifting motor 104.

[0033] In the embodiment of the present application, at least three casters 106 are installed on the lower end surfaces of the two side plates of the shaped structure, which can effectively reduce the resistance of the device when moving and facilitate the movement. In a specific example, the height of the two side plates of the shaped structure is 300 mm, the width spacing of the two side plates is 2000 mm, and the length is 1500 mm. The diameter of the caster 106 is 200 mm, and the width of the caster 106 is 60 mm, thereby effectively lowering the center of gravity of the device, increasing the contact area between the caster 106 and the bottom surface, and ensuring the stability of the device when moving.

[0034] In a specific example, the caster 106 is a universal wheel, and the upper fixing member of the universal wheel is welded to the lower end surface of the two side plates of the profile structure. At the same time, a brake fixing member is also provided on the caster 106 to fix the caster 106 and prevent the caster 106 from rotating during the equipment hoisting operation.

[0035] In the embodiment of the present application, the cross-section of the steel platform 101 is designed as a shaped structure, the steel frame platform is fixedly installed in the middle of the upper end surface of the shaped structure, and the distance between the two sides of the steel frame platform and the two sides of the shaped structure is 1 / 5 of the width of the shaped structure. In this way, the center of gravity of the equipment is as close to the middle as possible, further effectively improving the overall stability of the equipment.

[0036] Furthermore, by fixing the lifting motor 104 bracket and the reel 105 on the upper end surface of the shaped structure, and the lifting motor 104 and the reel 105 are both located on the inner side of the steel frame platform, and at the same time, the lifting motor 104 and the reel 105 are arranged symmetrically, the center of gravity of the equipment is further moved closer to the middle, making the lifting of heavy objects safer and improving the overall stability of the equipment.

[0037] In the embodiment of the present application, the steel frame column 102 includes: two side columns 112 and a top crossbeam. The lower ends of the two side columns 112 are symmetrically arranged along the length direction of the steel platform 101 and fixedly connected to the upper end surface of the shaped structure. The two ends of the top crossbeam are respectively fixedly connected to the upper ends of the two side columns 112. Furthermore, the side columns 112 are triangular structures, the bottom side of the triangular structure is fixedly connected to the upper end surface of the shaped structure, and the upper vertex of the triangular structure is fixedly connected to the end of the top crossbeam. Thus, the side columns 112 are designed as a triangular structure, which not only effectively improves the structural stability, but also makes the structure more compact, with higher space utilization, and is more convenient for use in a small space.

[0038] In a specific example, the lower end of the vertical arm 113 is installed on the top crossbeam through the lifting and steering device 108, and is directly opposite to the upper vertex of the triangular structure. In this way, the force on the vertical arm 113 is transmitted downward through the vertex of the triangle, avoiding the top crossbeam from being bent by force, improving the rigidity of the equipment, and ensuring the hoisting accuracy of the equipment during hoisting.

[0039] In another specific example, the lifting motor 104, the drum 105, the second fixed pulley 202, the third fixed pulley 203, and the top crossbeam are all located in the same vertical plane, thereby, during the lifting process of the equipment, each component will not bear the eccentric load force, thereby improving the stability of the equipment during lifting. Further, the triangular structure of the side column 112 is an equilateral triangle or an isosceles triangle, and the top crossbeam is arranged along the length direction of the steel platform 101 and is located on the vertical bisector of the length direction of the steel platform 101, thereby, the lifting motor 104, the drum 105, the second fixed pulley 202, and the third fixed pulley 203 are all located on the vertical bisector of the length direction of the steel platform 101, further making the center of the equipment located on the vertical bisector of the length direction of the steel platform 101, effectively improving the stability of the equipment when lifting heavy objects.

[0040] The direction of power transmission is changed through the first fixed pulley 201, the second fixed pulley 202, the third fixed pulley 203, and the fourth fixed pulley 204, improving the power transmission efficiency and reducing power loss. At the same time, the first fixed pulley 201 is directly above the lifting motor 104, the second fixed pulley 202 is above the drum 105, the third fixed pulley 203 is directly above the second fixed pulley 202, the first fixed pulley 201 and the second fixed pulley 202 are at the same height, and the third fixed pulley 203 and the fourth fixed pulley 204 are at the same height. Thereby, it effectively ensures that during the heavy object hoisting process, the driving force of the lifting motor 104 is transmitted along the horizontal or vertical direction, not only improving the force transmission efficiency, but also making the force-bearing condition of the equipment better, reducing the friction and wear of each component, and extending the service life.

[0041] In the embodiment of the present application, a counterweight 109 is further provided on the upper surface of the 冖-shaped structure. The counterweights 109 are symmetrically arranged on both sides of the steel frame column 102 and are in contact with the steel frame platform. Thereby, the center of gravity of the equipment is lowered, improving the hoisting stability of the equipment. The counterweights 109 on both sides of the steel frame column 102 have the same weight to avoid the center offset of the equipment and ensure the hoisting stability of the equipment. At the same time, the more the number and the greater the weight of the counterweights 109, the lower the center of gravity of the equipment and the better the stability when lifting heavy objects. Here, it should be noted that the counterweights 109 are prefabricated according to a preset standard and are detachably installed on the steel platform 101. Specifically, the size of the counterweight 109 is 400mm×300mm×1560mm.

[0042] In the embodiment of the present application, the upper panel of the 冖-shaped structure is welded in a square shape through multiple platform steel beams, and the distance between adjacent two platform steel beams is 1500 millimeters. And stiffening plates are welded on both sides of the platform steel beams to improve the rigidity and strength of the steel platform 101.

[0043] In the embodiment of the present application, the lifting motor 104 and the drum 105 are respectively connected to the steel platform 101 through the lifting motor 104 bracket and the drum 105 bracket. Specifically, they are fixedly connected to the steel platform 101 through bolts for the installation and maintenance of the lifting motor 104 and the drum 105.

[0044] In a specific example, the diameters of the first fixed pulley 201, the third fixed pulley 203, and the fourth fixed pulley 204 are the same, all being 200 millimeters, the diameter of the second fixed pulley 202 is 80 millimeters; the diameter of the drum 105 is 300 millimeters.

[0045] In the embodiment of the present application, the lower end of the vertical arm 113 is installed on the steel frame column 102 through the lifting and steering device 108, so that the boom 103 can rotate around the axis of the vertical arm 113 to increase the lifting range of the equipment, so that the equipment can lift and transfer heavy objects in different positions at the same working position.

[0046] In a specific example, the upper end of the steel frame column is a cylindrical structure, and the vertical arm 113 is inserted into the cylindrical space of the cylindrical structure; correspondingly, the lifting and steering device includes: a lifting hydraulic cylinder and a steering assembly, and the two parts of the lifting hydraulic cylinder that can move telescopically relative to each other are respectively fixedly connected to the vertical arm 113 and the steel frame column to drive the vertical arm 113 to move telescopically in the cylindrical space along the vertical direction; the cylindrical structure is connected to the lower structure of the steel frame column through the steering assembly to drive the cylindrical structure and the lower structure of the steel frame column to rotate relative to each other.

[0047] Specifically, the lifting hydraulic cylinder is driven by a hydraulic station 304 arranged on the steel frame column 102. The hydraulic station 304 is fixedly installed on the steel frame column 102 through a bracket and is located above the configuration block. The hydraulic pipeline 305 is arranged along the steel frame column 102 to provide hydraulic driving force to the lifting hydraulic cylinder.

[0048] Furthermore, the steering assembly includes: a rocker arm 118, a driving gear 128 and a driven gear 138. The rocker arm 118 is fixed to the lower structure of the steel frame column 102 through the rocker arm 118 bracket, and the driven gear 138 is fixedly installed on the cylindrical structure. The driving gear 128 is fixedly connected to the output end of the rocker arm 118, and a gear transmission is formed between the driving gear 128 and the driven gear 138. By shaking the rocker arm 118, the driving gear 128 drives the driven gear 138 to rotate, which can drive the cylindrical structure to rotate, and then drive the vertical arm 113 to rotate to adjust the hoisting direction.

[0049] In the embodiment of the present application, the equipment for hoisting heavy objects in a narrow space also includes: an inspection ladder 301. The lower end of the inspection ladder 301 is fixed to the upper end surface of the shaped structure, the upper end of the inspection ladder 301 is in contact with the steel frame column 102, and is located below the lifting and steering device 108, and is used to assist in the maintenance of the lifting and steering device 108. In this way, the staff can use the inspection ladder 301 to maintain the lifting and steering device 108 at a high point; at the same time, the third fixed pulley 203, the fourth fixed pulley 204, the hook 107, etc. can also be maintained.

[0050] In the embodiment of the present application, the power for lifting heavy objects is provided by the lifting motor 104, and the lifting force is transmitted through the wire rope 205 on the fixed pulley group, so that the hoisted objects are evenly stressed, ensuring the successful lifting of the heavy objects, and the hoisted heavy objects are accurately controlled by adjusting the speed of the lifting motor 104, the height of the boom 103 and the mass of the counterweight.

[0051] In the embodiment of the present application, the caster 106 can also be driven by electric drive to rotate and drive the steel platform 101 to move. Specifically, the drive motor 302 is fixedly installed on the steel platform 101, and the output end of the drive motor 302 is connected to the driven pulley fixedly installed on the caster 106 through a belt drive, so that the output power of the drive motor 302 is transmitted to the caster 106 through the belt drive. Further, the drive motor 302 can be placed on the outer side of the steel frame column 102, and arranged on both sides of the steel frame column 102 opposite to the counterweight block.

[0052] In the embodiment of the present application, a power battery 303 for providing power to the hydraulic station 304 and the drive motor 302 can also be fixedly installed on the steel frame column 102. Specifically, the power battery 303 is fixedly installed on the steel frame column 102 through a battery bracket, and along the high rigidity direction, the power battery 303, the hydraulic station 304, and the counterweight are arranged up and down in sequence. In this way, the power battery 303 and the hydraulic station 304 can be used as part of the breeding, thereby reducing the number and weight of the counterweight.

[0053] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for lifting heavy objects in a narrow space, characterized in that: include: A movable steel platform, a lifting motor, a reel, a steel frame column and a boom; the lifting motor, the reel and the steel frame column are all fixedly mounted on the steel platform; the boom is mounted on the steel frame column through a lifting and steering device; The cross section of the steel platform is a square shape, and at least three casters are installed on the lower end surfaces of the two side plates of the square structure; The steel frame platform is fixedly installed in the middle of the upper end surface of the profile structure, and the distance between the two sides of the steel frame platform and the two sides of the profile structure is 1 / 5 of the width of the profile structure; The lifting motor is fixedly mounted on the upper end surface of the profile structure through a lifting motor bracket, and is located on the inner side of the steel frame platform; the reel is fixedly mounted on the upper end surface of the profile structure through a reel bracket, and is located on the inner side of the steel frame platform and is symmetrically arranged with the lifting motor; The steel frame platform is provided with a first fixed pulley and a second fixed pulley, and the first fixed pulley is located directly above the lifting motor, and the second fixed pulley is located above the drum and outside the steel frame platform; the first fixed pulley and the second fixed pulley are located at the same height; The boom comprises: a vertical arm and a horizontal arm, one end of the vertical arm is fixedly mounted on the steel frame column through the lifting and steering device, the other end of the vertical arm is fixedly connected to one end of the horizontal arm, and the horizontal arm is in a horizontal state; a third fixed pulley is provided at the fixed connection portion between the vertical arm and the horizontal arm, and a fourth fixed pulley is provided at the extended end of the horizontal arm; the third fixed pulley and the fourth fixed pulley are located at the same height and are both located below the horizontal arm; the third fixed pulley is located directly above the second fixed pulley; Among them, the wire rope on the drum is passed around the lifting motor, the first fixed pulley, the second fixed pulley, the third fixed pulley, and the fourth fixed pulley in sequence and then fixedly connected to the hook to lift heavy objects under the drive of the lifting motor.

2. The device for hoisting heavy objects in a narrow space according to claim 1, characterized in that: The steel frame columns include: two side columns and a top crossbeam. The lower ends of the two side columns are symmetrically arranged along the length direction of the steel platform and fixedly connected to the upper end surface of the profiled structure. The two ends of the top crossbeam are respectively fixedly connected to the upper ends of the two side columns.

3. The device for hoisting heavy objects in a narrow space according to claim 2, characterized in that: The side column is a triangular structure, the bottom side of the triangular structure is fixedly connected to the upper end surface of the shaped structure, and the upper vertex of the triangular structure is fixedly connected to the end of the top crossbeam.

4. The device for hoisting heavy objects in a narrow space according to claim 3, characterized in that: The lower end of the vertical arm is installed on the top crossbeam through the lifting and steering device, and is directly opposite to the upper vertex of the triangular structure.

5. The device for hoisting heavy objects in a narrow space according to claim 2, characterized in that: The lifting motor, the drum, the second fixed pulley, the third fixed pulley, and the top crossbeam are all located in the same vertical plane.

6. The device for hoisting heavy objects in a narrow space according to claim 1, characterized in that: The upper surface of the shaped structure is also provided with a counterweight block, which is symmetrically arranged on both sides of the steel frame column and abuts against the steel frame platform.

7. The device for hoisting heavy objects in a narrow space according to claim 1, characterized in that: The upper panel of the shaped structure is formed by welding a plurality of platform steel beams in a U-shape, and the spacing between two adjacent platform steel beams is 1500 mm.

8. The device for hoisting heavy objects in a narrow space according to claim 1, characterized in that: The diameters of the first fixed pulley, the third fixed pulley and the fourth fixed pulley are the same, which is 200 mm; the diameter of the second fixed pulley is 80 mm.

9. The device for hoisting heavy objects in a narrow space according to any one of claims 1 to 8, characterized in that: The upper end of the steel frame column is a cylindrical structure, and the vertical arm is inserted into the cylindrical space of the cylindrical structure; Correspondingly, The lifting and steering device comprises: a lifting hydraulic cylinder and a steering assembly, wherein the two parts of the lifting hydraulic cylinder that are relatively telescopically movable are respectively fixedly connected to the vertical arm and the steel frame column to drive the vertical arm to telescopically move in the cylindrical space along the vertical direction; The cylindrical structure is connected to the lower structure of the steel frame column through the steering assembly to drive the cylindrical structure and the lower structure of the steel frame column to rotate relative to each other.

10. The device for hoisting heavy objects in a narrow space according to claim 9, characterized in that: The equipment for hoisting heavy objects in a narrow space also includes: an inspection ladder; The lower end of the maintenance ladder is fixed to the upper end surface of the profile structure, the upper end of the maintenance ladder is in contact with the steel frame column, and is located below the lifting and steering device to assist in the maintenance of the lifting and steering device.

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