A folding arm roof rack

Abstract

The utility model discloses a kind of folding arm type roof hangers, belong to crane technical field, including pedestal, rotating platform, hoist mechanism, hoist arm unit and hook unit, hoist arm unit includes front folding arm, rear folding arm, first hydraulic mechanism and second hydraulic mechanism, the proximal end of front folding arm is hinged with rotating platform through first pivot, the distal end of front folding arm is hinged with rear folding arm through second pivot, first hydraulic mechanism is assembled between front folding arm and rotating platform, for driving front folding arm to lift, second hydraulic mechanism is assembled between front folding arm and rear folding arm, for driving rear folding arm to be retracted, hook unit includes fixed pulley block and hook pulley block, fixed pulley block is fixedly arranged the distal end of rear folding arm, hook pulley block is movably arranged below fixed pulley block, the steel wire rope of hoist mechanism is connected with hook pulley block through fixed pulley block, to drive hook pulley block to be retracted.The utility model folding hoist arm after recovery occupies small roof area, safely and stably stored on roof.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to a folding arm roof crane. Background Technology

[0002] Roof cranes, as lifting equipment installed on the roofs of high-rise buildings, are used to quickly and accurately deliver the required engineering materials to the roof or various floors during the construction of high-rise buildings. They also assist workers in the high-altitude installation of equipment such as air conditioning units and ventilation ducts. In addition, in the later stages of high-rise building construction, they can also be used to dismantle internal tower cranes, overcoming the limitations of traditional dismantling methods.

[0003] Existing roof cranes typically include a base, a rotating platform, a hoisting mechanism, a lifting boom, and a hook. The rotating platform is rotatably mounted on the base via a rotary drive device. The hoisting mechanism is fixed to one side of the rotating platform, and the lifting boom is hinged to the other side of the rotating platform and connected to the platform via a lifting drive device. The hook is located at the far end of the lifting boom and connected to the hoisting mechanism via a wire rope. Lifting operations are achieved through the cooperation of the rotary drive device, the lifting drive device, and the hoisting mechanism. However, due to the lifting radius requirements, the overall length of the lifting boom of the aforementioned roof cranes is relatively long. During downtime, the lifting boom needs to be set horizontally. If it is completely parked inside the roof, it occupies too much roof area. If the far end of the lifting boom and the hook are located outside the building roof, there is a lack of effective protection, especially in severe weather, which poses a safety hazard. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a folding arm roof crane. During work stoppages, the crane arm can be folded and retracted to prevent the far end of the crane arm and the hook from being exposed on the roof, thus ensuring a safety factor during work stoppages and minimizing the roof area it occupies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A folding boom roof crane includes a base, a rotating platform rotatably mounted on the base, a winch mechanism fixedly mounted on the rotating platform, a boom unit hinged to the rotating platform, and a hook unit located at the distal end of the boom unit. The boom unit includes a front boom, a rear boom, a first hydraulic mechanism, and a second hydraulic mechanism. The proximal end of the front boom is hinged to the rotating platform via a first pivot, and the distal end of the front boom is hinged to the rear boom via a second pivot. The first hydraulic mechanism is mounted between the front boom and the rotating platform to drive the lifting and lowering of the front boom on the rotating platform. The second hydraulic mechanism is mounted between the front boom and the rear boom to drive the retraction and extension of the rear boom on the front boom. The hook unit includes a fixed pulley block and a hook pulley block. The fixed pulley block is fixedly mounted to the distal end of the rear boom, and the hook pulley block is movably mounted below the fixed pulley block. The wire rope of the winch mechanism passes through the fixed pulley block and is connected to the hook pulley block to drive the retraction and extension of the hook pulley block on the fixed pulley block. The original integral design of the lifting boom was adjusted to a folding boom structure. During construction, the second hydraulic mechanism drives the rear folding boom to rotate around the second pivot and unfold to a position coaxial with the front folding boom. Together with the front folding boom, it performs lifting and lowering actions under the drive of the first hydraulic mechanism. The hook pulley block lifts the heavy object under the drive of the winch mechanism. When work stops, the winch mechanism retracts the hook pulley, and the second hydraulic mechanism drives the rear folding boom to flip and fold under the front folding boom. This effectively reduces the lateral length of the entire lifting boom when it is lowered to a horizontal position. Compared with existing technologies, this significantly reduces the area occupied on the roof while avoiding the lifting boom end and hook extending out of the building, thus achieving safe and effective protection.

[0007] The front folding arm is equipped with hooks and a bracket assembly, while the rear folding arm has a hook post. The hook pulley block has a hook portion. When the rear folding arm is retracted below the front folding arm and the hook pulley block is retracted below the fixed pulley block, the hooks engage with the hook post, and the hook portion engages with the bracket assembly. The hook engagement with the hook post locks the folded rear folding arm, preventing the risk of it detaching due to a failure of the second hydraulic mechanism. The bracket assembly engages with the hook portion, locking the retracted state of the hook unit and preventing swaying due to external environmental factors in a free state, ensuring stable storage of the roof-mounted crane during downtime.

[0008] The hanger assembly includes an upper rotating rod, a U-shaped connecting rod, a pull rod, and an elastic element. The upper rotating rod is rotatably mounted inside the front folding arm. The pull rod is fixed in the middle of the upper rotating rod and connected to the front folding arm via the elastic element. The U-shaped connecting rod is located below the front folding arm. The open end of the U-shaped connecting rod is fixedly connected to both ends of the upper rotating rod, and the closed end of the U-shaped connecting rod is engaged with the hook.

[0009] A triangular mounting bracket is fixed on the rotating platform. A first rotating shaft is installed through the top edge of the triangular mounting bracket. The first hydraulic mechanism includes a first hydraulic cylinder and a bearing seat. The bearing seat is fixed on the inner side of the proximal end of the front folding arm. The cylinder seat end of the first hydraulic cylinder is hinged to the rotating platform near the bottom edge of the triangular mounting bracket. The output end of the first hydraulic cylinder is hinged to the bearing seat.

[0010] The second hydraulic mechanism includes a second hydraulic cylinder, a front connecting rod, a rear connecting rod, a push-pull balance shaft, and a connecting seat. The connecting seat is fixed to the inner side of the far end of the front folding arm. There are two front connecting rods, which are rotatably connected to the two sides of the front folding arm near the second rotating shaft via a third rotating shaft. There are two rear connecting rods, which are rotatably connected to the two sides of the rear folding arm near the second rotating shaft via a fourth rotating shaft. The ends of the rear connecting rods and the ends of the front connecting rods are rotatably connected via the push-pull balance shaft. The cylinder seat end of the second hydraulic cylinder is hinged to the connecting seat, and the output end of the second hydraulic cylinder is connected to the push-pull balance shaft.

[0011] The fixed pulley block includes a pulley frame, a first pulley, a second pulley, and a third pulley. The pulley frame is fixed vertically to the far end of the rear folding arm. The first and second pulleys are rotatably mounted on the upper end of the pulley frame, and the third pulley is rotatably mounted on the lower end of the pulley frame. The installation height of the first pulley is higher than that of the second pulley. The wire rope passes through the bottom of the first pulley, goes around the top of the second pulley, and is connected to the hook pulley block through the third pulley.

[0012] The hook pulley block includes a movable pulley and a hook fixed on the movable pulley. The wire rope passes through the inside of the third pulley, goes around the movable pulley, and is connected to the lower end of the pulley frame via a rope connector.

[0013] The hook unit also includes a movable pulley assembly located between the pulley frame and the hook pulley assembly. The movable pulley assembly includes a connecting frame, a first guide pulley, an upper clamping plate, a second guide pulley, a first left pulley, a first right pulley, a detachable clamping plate, and a middle pulley. The hook pulley assembly includes a lower clamping plate, a second left pulley, a second right pulley, and a hook portion fixed to the bottom of the lower clamping plate. The connecting frame is rotatably connected to the lower end of the pulley frame via a fourth pivot. The upper clamping plate is fixed to the bottom of the connecting frame and detachably connected to the lower clamping plate via the detachable clamping plate. The first guide pulley is rotatably positioned in the middle of the connecting frame. The first left and first right pulleys are symmetrical. The upper clamping plate is arranged and rotated on both sides of the lower end. The second guide pulley is rotated and positioned at the upper end of the upper clamping plate near the first left pulley. The middle pulley is rotated and positioned on the detachable clamping plate. The second left pulley and the second right pulley are symmetrically arranged and rotated on both sides of the lower clamping plate. The wire rope passes sequentially through the outer side of the third pulley, the inner side of the first guide pulley and the inner side of the second guide pulley, passes around the first left pulley, the second left pulley, the middle pulley and the second right pulley, and is connected to the upper clamping plate via a rope connecting buckle. Alternatively, it passes around the first left pulley, the second left pulley, the middle pulley, the second right pulley and the first right pulley, and is connected to the detachable clamping plate via a rope connecting buckle.

[0014] A limiting platform is fixed to the outside of the upper clamping plate. The limiting platform extends upward to form a limiting part. The limiting part cooperates with the far end of the rear folding arm to limit the maximum angle at which the connecting frame rotates away from the rear folding arm.

[0015] The front folding arm has a front connecting part at its distal end and a rear connecting part at its proximal end. Both the front and rear connecting parts have connecting holes. When the rear folding arm is unfolded to a position coaxial with the front folding arm, the connecting holes of the front connecting part and the rear connecting part are aligned and connected by a positioning pin.

[0016] This utility model has the following beneficial effects: By designing the lifting arm as a folding arm structure, during construction, the second hydraulic mechanism drives the rear folding arm to rotate around the second pivot and unfold to a position coaxial with the front folding arm. Together with the front folding arm, it performs lifting and lowering actions under the drive of the first hydraulic mechanism. The hook pulley block lifts the heavy object under the drive of the winch mechanism. When work stops, the winch mechanism retracts the hook pulley, and the second hydraulic mechanism drives the rear folding arm to flip and fold under the front folding arm. This effectively reduces the lateral length of the entire lifting arm when it is lowered to a horizontal position. Compared with the prior art, it significantly reduces the area occupied on the roof while avoiding the lifting arm end and hook extending out of the building, thus achieving safe and effective protection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the rear folding arm in the deployed state in Example 1;

[0019] Figure 2 This is a schematic diagram of the structure of the rear folding arm in the retracted state in Example 1;

[0020] Figure 3 for Figure 1 A magnified view of part A in the image;

[0021] Figure 4 for Figure 1 A magnified view of part B in the image;

[0022] Figure 5 for Figure 2 A magnified view of part C;

[0023] Figure 6 This is a partially enlarged view of the second hydraulic mechanism in this utility model;

[0024] Figure 7 This is a magnified view of the distal end of the rear folding arm in the deployed state in Example 2;

[0025] Figure 8 This is a magnified view of the distal end of the rear folding arm in the retracted state in Example 2;

[0026] Figure 9 This is a front view of the rear folding arm in the retracted state in Example 2;

[0027] Figure 10 This is a structural diagram of the hook unit in Example 2 under multiple magnification states, wherein, Figure 10 (a) is a structure diagram of the 2x ratio. Figure 10 (b) is a structure diagram of the three-fold ratio; Figure 10 (c) is a structure diagram of the four-fold magnification;

[0028] Figure 11 This is a schematic diagram of the front and rear folding arms in various states in Example 2, wherein, Figure 11 (a) is a schematic diagram showing the front folding arm in its lowest position and the rear folding arm deployed. Figure 11 (b) is a schematic diagram showing the front folding arm raised to the high position and the rear folding arm deployed. Figure 11 (c) is a schematic diagram showing the front folding arm in a high position and the rear folding arm beginning to retract. Figure 11 (d) is a schematic diagram showing the front folding arm in a high position and the rear folding arm fully retracted. Figure 11 (e) is a schematic diagram of the front folding arm descending to its lowest position and the rear folding arm fully retracted.

[0029] 1. Base; 2. Rotating platform; 201. Rotary motor; 202. Drive gear; 203. External gear ring; 204. Triangular mounting bracket; 3. Hoisting mechanism; 301. Wire rope; 4. Front folding arm; 401. First rotating shaft; 402. Front connecting part; 5. Rear folding arm; 501. Second rotating shaft; 502. Rear connecting part; 503. Hanging column; 6. First hydraulic mechanism; 601. First hydraulic cylinder; 602. Bearing seat; 7. Second hydraulic mechanism; 701. Second hydraulic cylinder; 702. Connecting seat; 703. Front connecting rod; 704. Rear connecting rod; 705. Third rotating shaft; 706. Fourth rotating shaft; 707. Push-pull balance shaft; 8. Fixed pulley block; 801. Pulley frame; 8 02. First pulley; 803. Second pulley; 804. Third pulley; 9. Hook pulley block; 901. Hook part; 902. Movable pulley; 903. Rope connecting buckle; 904. Lower clamping plate; 905. Second left pulley; 906. Second right pulley; 10. Hanging frame assembly; 1001. U-shaped connecting rod; 1002. Upper rotating rod; 1003. Pull rod; 1004. Elastic element; 11. Hook assembly; 12. Connecting hole; 13. Connecting frame; 1301. First guide pulley; 14. Upper clamping plate; 1401. Second guide pulley; 1402. First left pulley; 1403. First right pulley; 15. Detachable clamping plate; 1501. Middle pulley; 1502. Fixing hole. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and the terms "far end" and "near end" refer to the positional relationship of the component relative to the base, and therefore should not be construed as limiting this utility model.

[0033] like Figure 1 As shown, this utility model provides a folding arm roof crane, including a base 1, a rotating platform 2 rotatably mounted on the base 1, a hoisting mechanism 3 fixedly mounted on the rotating platform 2, a lifting arm unit hinged to the rotating platform 2, and a hook unit located at the far end of the lifting arm unit. Similar to existing technologies, as shown... Figure 3 As shown, multiple support leg structures are fixed to the outer side of the base 1 to improve the load-bearing balance capacity of the base 1. The rotating platform 2 is rotatably connected to the middle of the base 1 through a rotating bearing. An external gear ring 203 is fixed on the outer ring of the rotating bearing. A rotating motor 201 is fixed on the rotating platform 2. The output end of the rotating motor 201 is connected to a drive gear 202 that meshes with the external gear ring 203. Driven by the rotating motor 201, the rotating platform 2 rotates around the center of the base 1, thereby driving the lifting arm unit and the hook unit to rotate. The horizontal projection length of the lifting arm unit forms the working radius of the roof crane.

[0034] Unlike existing technologies, such as Figure 1 As shown, the lifting boom unit includes a front folding boom 4, a rear folding boom 5, a first hydraulic mechanism 6, and a second hydraulic mechanism 7. The proximal end of the front folding boom 4 is hinged to the rotating platform 2 via a first pivot 401, and the distal end of the front folding boom 4 is hinged to the rear folding boom 5 via a second pivot 501. The first hydraulic mechanism 6 is mounted between the front folding boom 4 and the rotating platform 2 to drive the lifting and lowering of the front folding boom 4 on the rotating platform 2. The second hydraulic mechanism 7 is mounted between the front folding boom 4 and the rear folding boom 5 to drive the retraction and extension of the rear folding boom 5 on the front folding boom 4. The operation involves a hook unit comprising a fixed pulley block 8 and a hook pulley block 9. The fixed pulley block 8 is fixedly mounted on the distal end of the rear folding arm 5, and the hook pulley block is movably mounted below the fixed pulley block. The wire rope 301 of the hoisting mechanism 3 passes through the fixed pulley block 8 and is connected to the hook pulley block 9 to drive the hook pulley block 9 to retract and extend on the fixed pulley block. Specifically, in embodiment 1, the hook pulley block 9 includes a movable pulley 902 and a hook portion 901 fixed on the movable pulley 902.

[0035] A folding boom crane, consisting of a front folding boom 4 and a rear folding boom 5, is used during construction, such as... Figure 1 As shown, the second hydraulic mechanism 7 drives the rear folding arm 5 to rotate around the second pivot 501 and unfold to a position coaxial with the front folding arm 4. Together with the front folding arm 4, it performs lifting and lowering actions under the drive of the first hydraulic mechanism 6. The hook pulley block 9 lifts the heavy object under the drive of the winch mechanism 3. When work stops, as shown... Figure 2 As shown, the hoisting mechanism 3 retracts the hook pulley, and the second hydraulic mechanism 7 drives the rear folding arm 5 to flip and fold below the front folding arm 4, thereby effectively reducing the lateral length of the entire lifting arm when it is lowered to the horizontal position. Compared with the existing technology, this significantly reduces the area occupied on the roof while avoiding the lifting arm end and hook from extending out of the building, thus achieving safe and effective protection.

[0036] In this embodiment, as Figure 3 As shown, a triangular mounting bracket 204 is fixed on the rotating platform 2. A first rotating shaft 401 is disposed through the top edge of the triangular mounting bracket 204. A winch mechanism 3 is located outside one bottom edge of the triangular mounting bracket 204. A first hydraulic mechanism 6 is located outside the other bottom edge of the triangular mounting bracket 204. The first hydraulic mechanism 6 includes a first hydraulic cylinder 601 and a support seat 602. The support seat 602 is fixed to the inner side of the proximal end of the front folding arm 4. The cylinder seat end of the first hydraulic cylinder 601 is hinged to the rotating platform 2 outside the triangular mounting bracket 204. The output end of the first hydraulic cylinder 601 is hinged to the support seat 602. When the output end of the first hydraulic cylinder 601 extends, it lifts the front folding arm 4 through the support seat 602 and rotates counterclockwise around the first rotating shaft 401. When the output end of the first hydraulic cylinder 601 retracts, the front folding arm 4 descends clockwise around the first rotating shaft 401.

[0037] In this embodiment, as Figure 6 As shown, the second rotating shaft 501 is rotatably mounted at the bottom of the front folding arm 4 and the rear folding arm 5. The second hydraulic mechanism 7 includes a second hydraulic cylinder 701, a front connecting rod 703, a rear connecting rod 704, a push-pull balance shaft 707, and a connecting seat 702. There are two front connecting rods 703, rotatably connected to both sides of the front folding arm 4 near the second rotating shaft 501 via a third rotating shaft 705. There are two rear connecting rods 704, rotatably connected to both sides of the rear folding arm 5 near the second rotating shaft 501 via a fourth rotating shaft 706. The ends of the rear connecting rods 704 and the ends of the front connecting rods 703 are rotatably connected via the push-pull balance shaft 707. The connecting seat 702 is fixed inside the distal end of the front folding arm 4. On the side, the cylinder seat end of the second hydraulic cylinder 701 is hinged to the connecting seat 702. The output end of the second hydraulic cylinder 701 is connected to the push-pull balance shaft 707. The output end of the second hydraulic cylinder 701 extends and, pushed by the push-pull balance shaft 707, the rear folding arm 5 rotates counterclockwise around the second rotating shaft 501 until it is coaxial with the front folding arm 4. The output shaft of the second hydraulic cylinder 701 retracts and, pulled by the push-pull balance shaft 707, the rear folding arm 5 rotates clockwise around the second rotating shaft 501 until it folds below the front folding arm 4. More preferably, when the rear folding arm 5 is unfolded to be coaxial with the front folding arm 4 and together they serve as the lifting arm for construction, in order to reduce the load on the second hydraulic cylinder 701, such as... Figure 6As shown, the distal end of the front folding arm 4 is provided with a front connecting part 402, and the proximal end of the rear folding arm 5 is provided with a rear connecting part 502. Specifically, the front connecting part 402 is an ear-shaped structure fixed to the top of the front folding arm 4, and the rear connecting part 502 is an ear-shaped structure fixed to the top of the rear folding arm 5. The ear-shaped structure of the rear connecting part 502 can be inserted into the ear-shaped structure of the front connecting seat 702. Both the front connecting part 402 and the rear connecting part 502 are provided with connecting holes 12. When the rear folding arm 5 is unfolded to a position coaxial with the front folding arm 4, the connecting holes 12 of the front connecting part 402 and the connecting holes 12 of the rear connecting part 502 are aligned and connected by a positioning pin. Thus, in the unfolded state, the rear folding arm 5 can be connected and locked to the front folding arm 4 through the positioning pin and the second rotating shaft 501. When the rear folding arm 5 is retracted, the lifting arm is lowered to a horizontal position, and the connection between the front folding arm 4 and the rear folding arm 5 is located within the roof operation range. The positioning pin is removed manually, and then the subsequent folding and retraction operation is completed.

[0038] In this embodiment, as Figure 4 As shown, the fixed pulley block 8 includes a pulley frame 801, a first pulley 802, a second pulley 803, and a third pulley 804. The pulley frame 801 is vertically fixed to the distal end of the rear folding arm 5. The first pulley 802 and the second pulley 803 are rotatably mounted on the upper end of the pulley frame 801, and the third pulley 804 is rotatably mounted on the lower end of the pulley frame 801. The axle axes of the first pulley 802, the second pulley 803, and the third pulley 804 are parallel to the axis of the first rotating shaft 401 and the axis of the second rotating shaft 501. The installation height of the first pulley 802 is higher than that of the second pulley 803. The wire rope 301 passes through the bottom of the first pulley 802, around the top of the second pulley 803, through the inside of the third pulley 804, around the movable pulley 902, and is connected to the lower end of the pulley frame 801 via the rope connecting buckle 903. The vertical arrangement of the first pulley 802 and the second pulley 803 can prevent the wire rope 301 from detaching from the second pulley 803. The third pulley 804 and the movable pulley 902 together form a double-ratio pulley module, which lifts objects through the hook part 901.

[0039] Further preferred, such as Figure 2As shown, the front folding arm 4 is equipped with a hook 11 and a hanger assembly 10, and the rear folding arm 5 is equipped with a hook post 503. When the rear folding arm 5 is retracted below the front folding arm 4, the hook 11 engages with the hook post 503. Specifically, there are two hooks symmetrically arranged on both sides of the bottom of the front folding arm 4. One end of each hook is rotatably connected to the front folding arm 4 via a pivot, and the other end is shaped into a hook. There are two hook posts 503, which are welded and fixed to the far bottom sides of the rear folding arm 5, and the hook posts 503 can be fastened. The hook is engaged within the hook-shaped end of the hanging component, thereby locking the folded and retracted rear folding arm 5 to prevent the risk of the rear folding arm 5 falling off due to the failure of the second hydraulic mechanism 7. When the rear folding arm 5 is retracted below the front folding arm 4 and the hook pulley group 9 is retracted below the fixed pulley group 8, the hook part 901 of the hook pulley group engages with the hanging frame assembly 10, thereby locking the retracted state of the hook unit to prevent it from shaking due to the external environment in a free state, thus ensuring the stable storage of the roof hanging during the shutdown period.

[0040] Specifically, such as Figure 5 As shown, the hanger assembly 10 includes an upper rotating rod 1002, a U-shaped connecting rod 1001, a pull rod 1003, and an elastic element 1004. The upper rotating rod 1002 is rotatably disposed within the front folding arm 4. The pull rod 1003 is fixed to the middle of the upper rotating rod 1002 and connected to the front folding arm 4 via the elastic element. The U-shaped connecting rod 1001 is located below the front folding arm 4. The open end of the U-shaped connecting rod 1001 is fixedly connected to both ends of the upper rotating rod 1002, and the closed end of the U-shaped connecting rod 1001 is engaged with the hook portion 901. In this design, the elastic element is an elastic tension spring. The closed end of 001 is set opposite to the pull rod 1003. In the initial state of the elastic spring, the closed end of the U-shaped connecting rod 1001 is located at the position abutting against the bottom of the front folding arm 4. When work needs to be stopped and the hook part is locked, the closed end of the U-shaped connecting rod 1001 is pulled to move away from the bottom of the front folding arm 4. The pull rod 1003 rotates around the upper rotating rod 1002, and the elastic spring is stretched. When construction is needed, the hook part is disengaged from the closed end of the U-shaped connecting rod 1001. The U-shaped pull rod 1003 returns to the initial position abutting against the bottom of the front folding arm 4 under the action of the elastic spring, thereby preventing the bracket assembly 10 from being in a free state during construction.

[0041] In Example 2, in order to achieve multiple adjustment ratios of the hook unit, such as Figure 7 and Figure 8As shown, the hook unit also includes a movable pulley assembly, which is located between the pulley frame 801 and the hook pulley assembly 9. Unlike Embodiment 1, in Embodiment 2, the hook pulley assembly 9 includes a lower clamping plate 904, a second left pulley 905, a second right pulley 906, and a hook portion 901 fixed to the bottom of the lower clamping plate 904. The movable pulley assembly includes a connecting frame 13, a first guide pulley 1301, an upper clamping plate 14, a second guide pulley 1401, a first left pulley 1402, a first right pulley 1403, a detachable clamping plate 15, and a middle pulley 1501. The connecting frame 13 is rotatably connected to the lower end of the pulley frame 801 via a fourth rotating shaft 706. The upper clamping plate 14 is fixed to the bottom of the connecting frame 13 and is detachably connected to the lower clamping plate 904 via the detachable clamping plate 15. Specifically, as shown... Figure 10 As shown, fixing holes 1502 are provided at the upper end of the detachable clamping plate 15 and the position where it is connected to the upper clamping plate 14, and at the lower end of the detachable clamping plate 15 and the position where it is connected to the lower clamping plate 904. Fixing pins can be detachably installed in the fixing holes 1502 at both ends of the detachable clamping plate 15. By assembling the fixing pins, the detachable connection between the detachable clamping plate 15 and the upper clamping plate 14 and the lower clamping plate 904 is completed. The installation of each pulley is described below. The first guide pulley 1301 is rotatably mounted in the middle of the connecting frame 13, and the axle axis of the first guide pulley 1301 is parallel to the axle axes of the first pulley 802, the second pulley 803, and the third pulley 804; the first left pulley 1402 and the first right pulley 1403 are symmetrically arranged and rotatably mounted on both sides of the lower end of the upper clamping plate 14, and the second guide pulley 1401 is rotatably mounted on the upper end of the upper clamping plate 14 near the first left pulley 1402; the middle pulley 150... 1. Rotatably mounted on the detachable clamping plate 15, the second left pulley 905 and the second right pulley 906 are symmetrically arranged and rotatably mounted on both sides of the lower clamping plate 904. The axle axes of the second guide pulley 1401, the first left pulley 1402, the first right pulley 1403, the middle pulley 1501, the second left pulley 905, and the second right pulley 906 are perpendicular to the axle axis of the first guide pulley 1301. The steel wire rope 301, which extends from the top of the second pulley 803, passes sequentially through the third pulley 803. The outer side of wheel 804, the inner side of the first guide pulley 1301 and the inner side of the second guide pulley 1401, pass through the first left pulley 1402, the second left pulley 905, the middle pulley 1501 and the second right pulley 906 and are connected to the upper clamping plate 14 via rope connecting buckle 903, or pass through the first left pulley 1402, the second left pulley 905, the middle pulley 1501, the second right pulley 906 and the first right pulley 1403 and are connected to the detachable clamping plate 15 via rope connecting buckle 903.

[0042] like Figure 10As shown in (a), the wire rope 301 passes through the first left pulley 1402, the second left pulley 905, the middle pulley 1501, and the second right pulley 906, and is connected to the pin at the lower end of the upper clamping plate 14 via the rope connecting buckle 903. During lifting operations, the fixing pin between the detachable clamping plate 15 and the upper clamping plate 14 is removed, and the hook unit performs double-rate lifting; Figure 10 As shown in (b), the wire rope 301 passes through the first left pulley 1402, the second left pulley 905, the middle pulley 1501, the second right pulley 906, and the first right pulley 1403, and then connects to the pin at the upper end of the detachable clamping plate 15 via the rope connecting buckle 903. During lifting operations, the fixing pin between the detachable clamping plate 15 and the upper clamping plate 14 is removed, and the hook unit performs a three-fold lifting operation; Figure 10 As shown in (c), the wire rope 301 passes through the first left pulley 1402, the second left pulley 905, the middle pulley 1501, and the second right pulley 906, and is connected to the pin at the lower end of the upper clamping plate 14 via the rope connecting buckle 903. During the lifting operation, the fixing pin between the detachable clamping plate 15 and the lower clamping plate 904 is removed, and the hook unit performs a four-fold lifting operation. By setting multiple pulleys, the winding method of the wire rope 301 can be changed to achieve multiple ratio conversions and improve the flexibility of lifting.

[0043] Further preferred, such as Figure 7 and Figure 8 As shown, a limiting platform is fixed to the outer side of the upper clamping plate 14. The limiting platform extends upward to form a limiting part, which cooperates with the distal end of the rear folding arm 5 to limit the maximum angle at which the connecting frame 13 rotates away from the rear folding arm 5. Figure 9 As shown, the maximum angle is the maximum angle of the angle formed between the surface of the upper clamping plate 14 and the axis of the rear folding arm 5, i.e., 180+α, where α is 10-15°.

[0044] When implementing the above technical solution, taking Example 2 as an example, as follows: Figure 11 As shown in (a), during construction, the second hydraulic cylinder 701 drives the rear folding arm 5 to rotate around the second rotating shaft 501 until it is coaxial with the front folding arm 4. The front connecting part 402 and the rear connecting part 502 at the top joint of the front folding arm 4 and the rear folding arm 5 are connected by a positioning pin. Depending on the required magnification, such as double magnification, the detachable clamping plate 15 and the upper clamping plate 14 are separated. When work is stopped, the positioning pin is pulled out, and the detachable clamping plate 15 and the upper clamping plate 14 are connected by a fixing pin, such as... Figure 11 As shown in (b), the first hydraulic cylinder 601 drives the front folding arm 4 and the rear folding arm 5 to rise together to a certain height; as Figure 11 (c) and Figure 11As shown in (d), the second hydraulic cylinder 701 drives the rear folding arm 5 to rotate around the second pivot 501 until it folds with the front folding arm 4. During this process, the winch mechanism 3 cooperates to release the wire rope 301. The release can be performed based on the tension value of the wire rope 301 monitored by the tension sensor built into the winch mechanism 3. At the same time, the movable pulley block and the hook pulley block 9 continue to rotate around the rear folding arm 5 under their own weight until the limiting part at the top of the limiting platform abuts against the rear folding arm 5. Figure 11 As shown in (e), the first hydraulic cylinder 601 drives the front folding arm 4 and the rear folding arm 5 to descend to a horizontal position together. The hook part 11 is rotated so that its hook-shaped end is engaged with the hanging post 503 at the far end of the rear folding arm 5. The closed end of the U-shaped connecting rod 1001 is moved to the hook part 901 and engaged with the hook part. The folded and retracted lifting arm occupies a small area of ​​the roof and is safely and stably stored on the roof.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A folding boom roof crane, comprising a base, a rotating platform rotatably mounted on the base, a hoisting mechanism fixedly mounted on the rotating platform, a lifting boom unit hinged to the rotating platform, and a hook unit located at the distal end of the lifting boom unit, characterized in that, The lifting boom unit includes a front folding boom, a rear folding boom, a first hydraulic mechanism, and a second hydraulic mechanism. The proximal end of the front folding boom is hinged to the rotating platform via a first pivot, and the distal end of the front folding boom is hinged to the rear folding boom via a second pivot. The first hydraulic mechanism is mounted between the front folding boom and the rotating platform to drive the lifting and lowering of the front folding boom on the rotating platform. The second hydraulic mechanism is mounted between the front folding boom and the rear folding boom to drive the retraction and extension of the rear folding boom on the front folding boom. The hook unit includes a fixed pulley block and a hook pulley block. The fixed pulley block is fixedly mounted on the distal end of the rear folding boom, and the hook pulley block is movably mounted below the fixed pulley block. The wire rope of the hoisting mechanism passes through the fixed pulley block and is connected to the hook pulley block to drive the retraction and extension of the hook pulley block on the fixed pulley block.

2. The articulated roof crane according to claim 1, characterized in that, The front folding arm is provided with a hook and a hanging bracket assembly, the rear folding arm is provided with a hanging post, and the hook pulley assembly is provided with a hook part. When the rear folding arm is retracted to below the front folding arm and the hook pulley assembly is retracted to below the fixed pulley assembly, the hook is engaged with the hanging post, and the hook part is engaged with the hanging bracket assembly.

3. A folding arm roof crane according to claim 2, characterized in that, The hanger assembly includes an upper rotating rod, a U-shaped connecting rod, a pull rod, and an elastic element. The upper rotating rod is rotatably disposed inside the front folding arm. The pull rod is fixed in the middle of the upper rotating rod and connected to the front folding arm via the elastic element. The U-shaped connecting rod is located below the front folding arm. The open end of the U-shaped connecting rod is fixedly connected to both ends of the upper rotating rod, and the closed end of the U-shaped connecting rod is engaged with the hook portion.

4. A folding arm roof crane according to any one of claims 1-3, characterized in that, A triangular mounting bracket is fixed on the rotating platform. The first rotating shaft passes through the top edge of the triangular mounting bracket. The first hydraulic mechanism includes a first hydraulic cylinder and a support seat. The support seat is fixed to the inner side of the proximal end of the front folding arm. The cylinder seat end of the first hydraulic cylinder is hinged to the rotating platform near the bottom edge of the triangular mounting bracket. The output end of the first hydraulic cylinder is hinged to the support seat.

5. A folding arm roof crane according to any one of claims 1-3, characterized in that, The second hydraulic mechanism includes a second hydraulic cylinder, a front connecting rod, a rear connecting rod, a push-pull balance shaft, and a connecting seat. The connecting seat is fixed to the inner side of the distal end of the front articulated arm. There are two front connecting rods, which are rotatably connected to both sides of the front articulated arm near the second rotating shaft via a third rotating shaft. There are two rear connecting rods, which are rotatably connected to both sides of the rear articulated arm near the second rotating shaft via a fourth rotating shaft. The ends of the rear connecting rods and the ends of the front connecting rods are rotatably connected via the push-pull balance shaft. The cylinder seat end of the second hydraulic cylinder is hinged to the connecting seat, and the output end of the second hydraulic cylinder is connected to the push-pull balance shaft.

6. A folding arm roof crane according to any one of claims 1-3, characterized in that, The fixed pulley assembly includes a pulley frame, a first pulley, a second pulley, and a third pulley. The pulley frame is vertically fixed to the far end of the rear folding arm. The first and second pulleys are rotatably mounted on the upper end of the pulley frame, and the third pulley is rotatably mounted on the lower end of the pulley frame. The installation height of the first pulley is higher than that of the second pulley. The wire rope passes through the bottom of the first pulley, around the top of the second pulley, and is connected to the hook pulley assembly through the third pulley.

7. A folding arm roof crane according to claim 6, characterized in that, The hook pulley assembly includes a movable pulley and a hook fixed on the movable pulley. The wire rope passes through the inside of the third pulley, goes around the movable pulley, and is connected to the lower end of the pulley frame via a rope connecting buckle.

8. A folding arm roof crane according to claim 6, characterized in that, The hook unit further includes a movable pulley assembly located between the pulley frame and the hook pulley assembly. The movable pulley assembly includes a connecting frame, a first guide pulley, an upper clamping plate, a second guide pulley, a first left pulley, a first right pulley, a detachable clamping plate, and a middle pulley. The hook pulley assembly includes a lower clamping plate, a second left pulley, a second right pulley, and a hook portion fixed to the bottom of the lower clamping plate. The connecting frame is rotatably connected to the lower end of the pulley frame via a fourth rotating shaft. The upper clamping plate is fixed to the bottom of the connecting frame and detachably connected to the lower clamping plate via a detachable clamping plate. The first guide pulley is rotatably disposed in the middle of the connecting frame. The first left pulley and the second guide pulley... A right pulley is symmetrically arranged and rotatably mounted on both sides of the lower end of the upper clamping plate. A second guide pulley is rotatably mounted on the upper end of the upper clamping plate near the first left pulley. A middle pulley is rotatably mounted on the detachable clamping plate. The second left pulley and the second right pulley are symmetrically arranged and rotatably mounted on both sides of the lower clamping plate. The wire rope passes sequentially through the outer side of the third pulley, the inner side of the first guide pulley and the inner side of the second guide pulley, passes around the first left pulley, the second left pulley, the middle pulley and the second right pulley, and is connected to the upper clamping plate via a rope connecting buckle. Alternatively, it passes around the first left pulley, the second left pulley, the middle pulley, the second right pulley and the first right pulley, and is connected to the detachable clamping plate via a rope connecting buckle.

9. A folding arm roof crane according to claim 8, characterized in that, A limiting platform is fixed to the outer side of the upper clamping plate. The limiting platform extends upward to form a limiting part. The limiting part cooperates with the far end of the rear folding arm to limit the maximum angle at which the connecting frame rotates away from the rear folding arm.

10. A folding arm roof crane according to any one of claims 1-3, characterized in that, The distal end of the front folding arm is provided with a front connecting part, and the proximal end of the rear folding arm is provided with a rear connecting part. Both the front connecting part and the rear connecting part are provided with connecting holes. When the rear folding arm is unfolded to a position coaxial with the front folding arm, the connecting holes of the front connecting part and the connecting holes of the rear connecting part are aligned and connected by a positioning pin.

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