Movable hoisting device in narrow space

Abstract

The application discloses a movable hoisting device in a narrow space and relates to the technical field of cranes. The device comprises a support frame, a winch installed on the top of the support frame, a hoisting frame arranged above the support frame, a pulley assembly installed on one side of the hoisting frame for guiding the traction rope of the winch, and an auxiliary steering device between the hoisting frame and the support frame. The first servo motor is started to drive the first adjusting lead screw to rotate, the sliding disc is driven to cooperate with the first rotating disc to drive the hoisting frame to complete linear position adjustment, and the working position of the hook at the front end of the hoisting frame is accurately adjusted. The structure effectively solves the problems of difficult equipment whole displacement, poor hook alignment accuracy and other industry problems under the working condition of narrow space, greatly improves the accuracy and operation convenience of hoisting alignment work in the narrow space, and meets the fine alignment demand of the limited space.

Description

Technical Field

[0001] This invention relates to the field of crane technology, specifically to a mobile lifting device for use in confined spaces. Background Technology

[0002] In fields such as construction, equipment maintenance, and industrial assembly, there are numerous lifting and hoisting operations conducted in confined spaces. These spaces are often small and surrounded by numerous obstacles, placing extremely high demands on the positioning accuracy, adjustment flexibility, and adaptability of the lifting equipment. Currently, most conventional small lifting devices on the market adopt a fixed, integral frame structure, with the overall posture of the equipment and the position of the hook fixed, lacking a precise position adjustment mechanism. In actual confined space operations, it is impossible to make targeted fine adjustments based on the workpiece lifting point and the layout of the site; the positioning operation can only be completed by moving the entire equipment body. However, moving the entire equipment in confined spaces is difficult, has a low tolerance for error, and is prone to lifting and positioning deviations, making it difficult to meet the requirements of high-precision lifting operations. Meanwhile, the hook angle of traditional lifting devices is not adjustable, and they can only achieve lifting operations in a fixed vertical position. Faced with complex working conditions such as irregularly shaped workpieces, oblique lifting points, and obstacles that are common on construction sites, they cannot flexibly correct the hook's swing position. They can only give up the optimal lifting point or adjust the workpiece's placement position, which greatly reduces the construction efficiency and adaptability of lifting operations in narrow spaces, and has poor versatility and practicality. Summary of the Invention

[0003] The purpose of this invention is to address the problem that existing conventional small lifting devices are mostly fixed structures, lacking fine-tuning of linear alignment and adjustment of hook angle, resulting in low alignment accuracy, cumbersome operation, and poor adaptability to working conditions when operating in narrow and confined spaces, thus failing to meet the high-precision lifting operation requirements in complex scenarios. The invention provides a mobile lifting device for narrow spaces.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a mobile lifting device for confined spaces, comprising: a support frame and a winch mounted on top of the support frame; a lifting frame disposed above the support frame, with a pulley assembly mounted on one side of the lifting frame for guiding the traction rope of the winch; an auxiliary steering device located between the lifting frame and the support frame for adjusting the lifting position of the lifting frame; two traction ropes arranged in a figure-eight pattern on the back of the lifting frame, with an auxiliary adapter between the support frame and the traction ropes for cooperating with the auxiliary steering device; and a counterweight disposed on the inner side of the support frame.

[0005] As a further embodiment of the present invention: the auxiliary steering device includes a sliding disk slidably connected to the inner side of the support frame, a first rotating disk is rotatably connected to the top of the sliding disk, and the lifting frame is fixedly connected to the top of the first rotating disk. A fourth servo motor for driving the first rotating disk to rotate is installed at the bottom of the sliding disk.

[0006] As a further embodiment of the present invention: the auxiliary steering device further includes two sets of suspension seats fixedly connected to the inner side of the support frame. Each set of suspension seats has a first adjusting screw rotatably connected to its inner side. The outer wall of the first adjusting screw is threaded with a first connecting block, and the first connecting block is fixedly connected to the sliding disc. A first servo motor for driving the first adjusting screw to rotate is installed on one side of the suspension seat.

[0007] As a further embodiment of the present invention: the auxiliary adapter includes a sliding seat slidably connected to the top of the support frame, a fixed seat is provided on the top of the sliding seat, a take-up roller is rotatably connected to the inner side of the fixed seat, a second servo motor for driving the take-up roller to rotate is installed on one side of the fixed seat, and the traction rope is wound on the outer wall of the take-up roller.

[0008] As a further embodiment of the present invention: the auxiliary adapter further includes two second adjusting screws rotatably connected to the inner side of the support frame, and a third servo motor installed on both sides of the support frame, wherein the output end of each third servo motor is fixedly connected to the corresponding second adjusting screw, and a second connecting block is fixedly connected to the bottom of each sliding seat, and the second connecting block is threadedly connected to the outer wall of the second adjusting screw.

[0009] As a further embodiment of the present invention: a second rotating disk is rotatably connected to the top of the sliding seat, and the second rotating disk is fixedly connected to the fixed seat. A spur gear is fixedly connected to the outer wall of the second rotating disk, and a spur rack that meshes with the spur gear is fixedly connected to the top of the support frame.

[0010] As a further embodiment of the present invention: an auxiliary frame is fixedly connected to the top of the sliding seat, and a first guide wheel and a second guide wheel are rotatably connected to the inner side of the auxiliary frame, and the first guide wheel and the second guide wheel are respectively located on one side of the traction rope.

[0011] As a further aspect of the present invention: a hydraulic cylinder for driving the counterweight to move linearly is installed at the end of the support frame, and the position of the counterweight is adjusted by the hydraulic cylinder.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This invention drives a first adjusting screw to rotate via a first servo motor, which in turn drives a sliding disc in conjunction with a first rotating disc to adjust the linear position of the lifting frame, precisely adjusting the working position of the hook at the front end of the lifting frame. This structure effectively solves the industry problem of difficult overall equipment movement and poor hook alignment accuracy in confined spaces, greatly improving the accuracy and ease of operation of lifting alignment in small spaces, and adapting to the precise alignment requirements of restricted spaces.

[0014] This invention utilizes a fourth servo motor to independently drive the first rotating disk to rotate relative to the sliding disk in a circular motion, enabling the entire lifting frame to achieve multi-angle sway adjustment and flexibly correct the sway position of the hook. This invention overcomes the drawbacks of traditional small lifting devices that are fixed in place and cannot fine-tune the hook angle. It is adaptable to complex working conditions such as oblique lifting in narrow spaces, alignment of irregularly shaped workpieces, and obstacle avoidance, significantly improving the equipment's adaptability and operational flexibility.

[0015] This invention utilizes a hydraulic cylinder at the end of the support frame to drive a counterweight to move laterally and synchronously throughout the entire process of adjusting the straightness and angle of the lifting frame. This ensures that the overall center of gravity of the equipment matches the adjustment state of the lifting frame in real time. This invention dynamically counteracts the eccentric load generated by the lifting frame adjustment, effectively solving the safety hazards of tilting, swaying, and overturning of equipment in confined spaces. It ensures the balance of the equipment's center of gravity in any adjusted position, significantly improving the stability of equipment operation and the safety of hoisting.

[0016] This invention, when the first rotating disk drives the crane frame to rotate circumferentially, uses two sets of third servo motors to drive the second adjusting screw to rotate, causing the sliding seat and fixed seat to make differentiated linear adjustments. Simultaneously, the second servo motor drives the take-up roller to compensate for the winding and unwinding of the traction rope. Relying on the meshing transmission of a rack and pinion, the fixed seat can adaptively rotate via the second rotating disk, precisely matching the crane frame's turning angle. This invention can dynamically compensate for the traction rope travel difference caused by the crane frame's turning, always maintaining tension on both traction ropes and preventing problems such as rope slack, slippage, and uneven loading. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of one side of the support frame structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the inner structure of the support frame of the present invention;

[0020] Figure 4 This is a schematic diagram of the sliding disk structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the sliding seat structure of the present invention;

[0022] Figure 6 This is a schematic diagram of one side of the sliding seat structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the auxiliary frame structure of the present invention.

[0024] In the diagram: 1. Support frame; 2. Winch; 3. First rotating disc; 4. Lifting frame; 5. Traction rope; 6. Fixed seat; 7. Suspension seat; 8. First servo motor; 9. First adjusting screw; 10. Hydraulic cylinder; 11. Counterweight; 12. Sliding seat; 13. Auxiliary frame; 14. First connecting block; 15. Sliding disc; 16. First guide wheel; 17. Second guide wheel; 18. Second servo motor; 19. Take-up roller; 20. Second rotating disc; 21. Spur rack; 22. Spur gear; 23. Third servo motor; 24. Second connecting block; 25. Second adjusting screw; 26. Fourth servo motor. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0027] Please see Figures 1 to 7This embodiment provides a movable lifting device for confined spaces, including: a support frame 1 and a winch 2 mounted on top of the support frame 1; a lifting frame 4, positioned above the support frame 1, with a pulley assembly on one side of the lifting frame 4 for guiding the traction rope of the winch 2; and an auxiliary steering device, located between the lifting frame 4 and the support frame 1, for adjusting the lifting position of the lifting frame 4. The auxiliary steering device includes a sliding disc 15 slidably connected to the inner side of the support frame 1, with a first rotating disc 3 rotatably connected to the top of the sliding disc 15, and the lifting frame 4 fixedly connected to the top of the first rotating disc 3. The bottom of the sliding disc 15... The unit is equipped with a fourth servo motor 26 for driving the first rotating disk 3 to rotate. The auxiliary steering device also includes two sets of suspension seats 7 fixedly connected to the inner side of the support frame 1. Each set of suspension seats 7 is rotatably connected to a first adjusting screw 9. The outer wall of the first adjusting screw 9 is threaded with a first connecting block 14, and the first connecting block 14 is fixedly connected to the sliding disk 15. A first servo motor 8 for driving the first adjusting screw 9 to rotate is installed on one side of the suspension seat 7. A hydraulic cylinder 10 for driving the counterweight 11 to move linearly is installed at the end of the support frame 1. The position of the counterweight 11 is adjusted by the hydraulic cylinder 10.

[0028] The hoist 2, together with the lifting frame 4 and a pulley assembly installed on one side of the lifting frame 4, forms a lifting device. Since this is existing technology, this solution does not elaborate further.

[0029] First, when the device is placed in a narrow space for lifting operations, and the position needs to be adjusted according to the requirements, when a linear position adjustment is required, the first servo motor 8 is started. The output of the first servo motor 8 drives the first adjusting screw 9 to rotate, which in turn drives the sliding plate 15 to drive the lifting frame 4 to move linearly through the first rotating plate 3, thereby making a linear adjustment to the position of the hook at the front end of the lifting frame 4. This device effectively solves the technical problems of limited working space in narrow spaces, inconvenience in moving the whole machine, and low hook alignment accuracy, and greatly improves the accuracy and convenience of lifting and alignment in narrow spaces.

[0030] During the lifting and positioning process, when there is an angular deviation in the lifted workpiece and the hook sway position needs to be corrected, the fourth servo motor 26 mounted at the bottom of the sliding plate 15 is activated. The output of the fourth servo motor 26 outputs rotational power, which independently drives the first rotating plate 3 to rotate in a circular motion relative to the sliding plate 15. The first rotating plate 3 drives the lifting frame 4 fixed at the top to rotate in a circular sway, realizing the multi-angle sway position adjustment of the hook at the front end of the lifting frame 4. Traditional small lifting devices are mostly fixed structures, and the hook angle cannot be finely adjusted. They cannot meet the positioning requirements for misaligned or obliquely arranged workpieces in narrow spaces. By independently driving the rotation of the fourth servo motor 26, precise adjustment of any small range of angles can be achieved, which can flexibly adapt to complex working conditions such as irregular points in narrow spaces, oblique lifting, and obstacle avoidance. It effectively makes up for the shortcomings of traditional equipment in terms of lack of angle adjustment function and poor adaptability to working conditions.

[0031] During the entire process of the first servo motor 8 driving the lifting frame 4 to complete the lateral linear position adjustment and the fourth servo motor 26 cooperating to complete the angle sway adjustment, the hydraulic cylinder 10 at the end of the support frame 1 is simultaneously activated. The output end of the hydraulic cylinder 10 extends and retracts, driving the counterweight block 11 to follow the lateral displacement. This allows the counterweight support position and overall center of gravity position of the counterweight block 11 to match the real-time adjustment position and extension state of the lifting frame 4. Traditional lifting equipment will generate a large eccentric load after fine adjustment of the lifting point and cantilever offset, which is very easy to cause the machine body to tilt, shake during operation, or even overturn. The risk of equipment instability is even higher in narrow spaces. By adjusting the position of the counterweight block 11 in real time through the hydraulic cylinder 10, the eccentric force generated by the adjustment of the lifting frame 4 can be dynamically offset, and the torque of the whole machine can be balanced in real time. This ensures that the device can maintain the stability of the center of gravity in any adjustment position, significantly improving the overall stability and operational safety of the equipment during the fine adjustment operation in narrow spaces.

[0032] Please see Figures 1 to 7Two traction ropes 5 are provided, arranged in a figure-eight shape and attached to the back of the lifting frame 4. An auxiliary adapter, which works in conjunction with an auxiliary steering device, is provided between the support frame 1 and the traction ropes 5. The auxiliary adapter includes a sliding seat 12 slidably connected to the top of the support frame 1. A fixed seat 6 is provided on the top of the sliding seat 12. A winding roller 19 is rotatably connected to the inner side of the fixed seat 6. A second servo motor 18 for driving the winding roller 19 is installed on one side of the fixed seat 6. The traction ropes 5 are wound around the outer wall of the winding roller 19. The auxiliary adapter also includes two second adjustment mechanisms rotatably connected to the inner side of the support frame 1. The support frame 1 includes a lead screw 25 and third servo motors 23 mounted on both sides of the support frame 1. The output end of each third servo motor 23 is fixedly connected to the corresponding second adjusting lead screw 25. A second connecting block 24 is fixedly connected to the bottom of each sliding seat 12 and threadedly connected to the outer wall of the second adjusting lead screw 25. A second rotating disk 20 is rotatably connected to the top of the sliding seat 12 and is fixedly connected to the fixed seat 6. A spur gear 22 is fixedly connected to the outer wall of the second rotating disk 20. A spur rack 21 that meshes with the spur gear 22 is fixedly connected to the top of the support frame 1.

[0033] While the first rotating disk 3 is adjusting its circumferential position, two third servo motors 23 are activated. The output of the third servo motors 23 drives the second adjusting screw 25 to rotate circumferentially, thereby driving the sliding seat 12 to move the fixed seat 6 to adjust its linear position. This causes the sliding seat 12 closer to the hook of the lifting frame 4 to move inward toward the support frame 1, and the sliding seat 12 farther away from the hook of the lifting frame 4 to move away from the support frame 1. At the same time, the second servo motor 18 is activated, causing the winding roller 19 to wind or release the traction rope 5. This allows the two traction ropes 5 to adapt to the turning position of the lifting frame 4 and form continuous traction. While the sliding seat 12 is moving linearly, the rack 21 is fixed. The stationary mechanism drives the spur gear 22 to rotate the fixed seat 6 via the second rotating disk 20, allowing the rotation angle of the fixed seat 6 to match the rotation angle of the lifting frame 4. This enables the traction rope 5 to be wound or released in real time during the angle adjustment of the lifting frame 4, dynamically compensating for the rope travel difference caused by the turning of the lifting frame 4. It keeps both traction ropes 5 in a taut and stressed state, providing continuous and stable traction constraint for the lifting frame 4 in the turning adjustment state, eliminating problems such as rope slack, loss of force, and uneven load, and greatly improving the accuracy, smoothness, and operational stability of the multi-angle turning adjustment of the lifting frame 4 in narrow spaces, ensuring the safe and efficient conduct of hoisting operations in complex and confined working conditions.

[0034] Please refer to the figure. Figure 7An auxiliary frame 13 is fixedly connected to the top of the sliding seat 12. The inner side of the auxiliary frame 13 is rotatably connected to a first guide wheel 16 and a second guide wheel 17, and the first guide wheel 16 and the second guide wheel 17 are respectively located on one side of the traction rope 5.

[0035] During the operation of the crane frame 4 in circular rotation and angle sway adjustment, the traction rope 5 will shift in position and angle synchronously with the turning action of the crane frame 4. This can easily lead to problems such as lateral swaying of the rope, trajectory deviation, friction interference with surrounding structures, and derailment, affecting traction stability. The first guide wheel 16 and the second guide wheel 17 can limit the position and correct the trajectory of the dynamically swaying traction rope 5 in real time, strictly constrain the lateral swing amplitude of the traction rope 5, standardize the movement path of the traction rope 5, and avoid misalignment, swaying, and excessive deviation of the traction rope 5 during the offset adjustment process.

[0036] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A movable lifting device for use in confined spaces, characterized in that, include: Support frame (1) and winch (2) mounted on top of the support frame (1). The lifting frame (4) is located above the support frame (1), and a pulley assembly is installed on one side of the lifting frame (4) to guide the traction rope of the winch (2). An auxiliary steering mechanism is located between the lifting frame (4) and the support frame (1) and is used to adjust the lifting position of the lifting frame (4); Two traction ropes (5) are provided, and the two traction ropes (5) are pulled in a figure-eight shape to the back of the crane frame (4). An auxiliary adapter that works with the auxiliary steering device is provided between the support frame (1) and the traction ropes (5). Counterweight (11) is disposed on the inner side of the support frame (1).

2. The movable lifting device for confined spaces according to claim 1, characterized in that, The auxiliary steering device includes a sliding disk (15) slidably connected to the inside of the support frame (1), a first rotating disk (3) is rotatably connected to the top of the sliding disk (15), and the lifting frame (4) is fixedly connected to the top of the first rotating disk (3). A fourth servo motor (26) for driving the first rotating disk (3) to rotate is installed at the bottom of the sliding disk (15).

3. The movable lifting device for confined spaces according to claim 2, characterized in that, The auxiliary steering system also includes two sets of suspension seats (7) fixedly connected to the inner side of the support frame (1). Each set of suspension seats (7) is rotatably connected to a first adjusting screw (9). The outer wall of the first adjusting screw (9) is threadedly connected to a first connecting block (14), and the first connecting block (14) is fixedly connected to the sliding plate (15). A first servo motor (8) for driving the first adjusting screw (9) to rotate is installed on one side of the suspension seat (7).

4. The movable lifting device for confined spaces according to claim 1, characterized in that, The auxiliary adapter includes a sliding seat (12) slidably connected to the top of the support frame (1). A fixed seat (6) is provided on the top of the sliding seat (12). A take-up roller (19) is rotatably connected to the inner side of the fixed seat (6). A second servo motor (18) for driving the take-up roller (19) to rotate is installed on one side of the fixed seat (6) by a bolt assembly. The traction rope (5) is wound on the outer wall of the take-up roller (19).

5. A movable lifting device for confined spaces according to claim 4, characterized in that, The auxiliary adapter also includes two second adjusting screws (25) rotatably connected to the inner side of the support frame (1), and a third servo motor (23) installed on both sides of the support frame (1). The output end of each third servo motor (23) is fixedly connected to the corresponding second adjusting screw (25). The bottom of each sliding seat (12) is fixedly connected to a second connecting block (24), and the second connecting block (24) is threadedly connected to the outer wall of the second adjusting screw (25).

6. A movable lifting device for confined spaces according to claim 5, characterized in that, The top of the sliding seat (12) is rotatably connected to a second rotating disk (20), and the second rotating disk (20) is fixedly connected to the fixed seat (6). A spur gear (22) is fixedly connected to the outer wall of the second rotating disk (20), and a spur rack (21) that meshes with the spur gear (22) is fixedly connected to the top of the support frame (1).

7. A movable lifting device for confined spaces according to claim 6, characterized in that, An auxiliary frame (13) is fixedly connected to the top of the sliding seat (12). A first guide wheel (16) and a second guide wheel (17) are rotatably connected to the inner side of the auxiliary frame (13), and the first guide wheel (16) and the second guide wheel (17) are located on one side of the traction rope (5).

8. A movable lifting device for confined spaces according to claim 1, characterized in that, The end of the support frame (1) is equipped with a hydraulic cylinder (10) for driving the counterweight (11) to move linearly, and the position of the counterweight (11) is adjusted by the hydraulic cylinder (10).

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