A lifting device

Abstract

This invention discloses a lifting device belonging to the field of lifting machinery technology, comprising a lifting assembly and a limiting assembly. The lifting assembly includes a boom, a lifting rope, and a hook. The boom is rotatable horizontally, and the lifting rope is connected to the boom, with a hook mounted on the rope. The limiting assembly is mounted on the boom and includes a winding component, a locking mechanism, a limiting rod, and a limiting rope. The limiting rod is connected to the boom and can rotate coaxially with it. One end of the limiting rope is connected to the winding component, and the other end is connected to the lifting rope. The winding component is used to release or wind up the limiting rope. At least a portion of the limiting rope extends along the limiting rod and is confined to it. The locking mechanism restricts the rotation of the limiting rod relative to the boom. By limiting the lifting rope through the limiting assembly, the tendency of the lifting rope and hook to move under inertia is counteracted, effectively reducing hook slippage and improving safety during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting machinery, and in particular to a lifting device. Background Art

[0002] In the field of construction, tower cranes are used to lift heavy objects. In the use of existing tower cranes, when lifting heavy objects, the boom of the tower crane needs to frequently start, accelerate, decelerate and stop to achieve the lifting process of the heavy objects.

[0003] However, during the lifting process, when the boom accelerates or decelerates suddenly, the hook will be thrown up due to inertia when the boom speed suddenly changes. The swing of the hook will not only affect the normal lifting work and reduce work efficiency, but also bring safety risks. Once the hook loses control due to inertia, it may cause the hoisted heavy objects to fall, causing casualties and property losses. Summary of the invention

[0004] The purpose of the present invention is to provide a lifting device to solve the technical problem in the prior art that when the boom of a tower crane is in use and there is a sudden acceleration or deceleration, the hook will be thrown up, which poses a safety hazard.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A lifting device, comprising:

[0007] A lifting assembly comprises a lifting arm, a lifting rope and a lifting hook, wherein the lifting arm can rotate in a horizontal direction, the lifting rope is connected to the lifting arm, and the lifting rope is provided with the lifting hook;

[0008] A limit assembly is arranged on the boom, and the limit assembly includes a winding piece, a locking mechanism, a limit rod and a limit rope. The limit rod is connected to the boom and can rotate coaxially with the boom. One end of the limit rope is connected to the winding piece, and the other end of the limit rope is connected to the suspension rope. The winding piece is used to release or reel in the limit rope. At least part of the limit rope extends along the limit rod and is limited on the limit rod. The locking mechanism can limit the rotation of the limit rod relative to the boom.

[0009] Preferably, the locking mechanism includes a locking seat and a limiting guide rod extending in an arc shape, an arc surface is formed on the limiting guide rod facing the limiting rod, and a locking seat is provided on one end of the limiting rod close to the limiting guide rod. When the limiting rod rotates, the locking seat moves along the arc surface, and the locking seat can lock with the arc surface to limit the rotation of the limiting rod.

[0010] Preferably, a plurality of limiting grooves are provided at one end of the locking seat facing the arc surface, and a plurality of accommodating grooves are provided on the arc surface corresponding to the limiting grooves, and each of the accommodating grooves is provided with a tightening spring and a locking block from the inside to the outside, and an electromagnet is provided on the locking seat. When the electromagnet is energized, the locking block is magnetically attracted to the corresponding limiting groove, thereby locking the locking seat; when the electromagnet is de-energized, the tightening spring drives the locking block away from the limiting groove, thereby unlocking the locking seat.

[0011] Preferably, limiting end blocks are provided at both ends of the limiting guide rod.

[0012] Preferably, the limit rod is arranged at the top of the boom and extends in the same direction as the boom, and the limit rod includes a first rod segment and a second rod segment, one end of the first rod segment is connected to the boom, the other end of the first rod segment is fixedly connected to one end of the second rod segment, and the other end of the second rod segment is bent and extended in a direction close to the boom.

[0013] Preferably, a guide wheel is provided at the connection between the first rod segment and the second rod segment, and the limiting rope is passed through the guide wheel and is slidably connected to the guide wheel.

[0014] Preferably, the length of the limiting rod is greater than or equal to the length of the boom.

[0015] Preferably, a connecting seat is movably connected to the lifting rope, the connecting seat is sleeved on the lifting rope and can slide along the extending direction of the lifting rope, and the other end of the limiting rope is connected to the connecting seat.

[0016] Preferably, a guide channel is formed inside the connecting seat, the lifting rope is passed through the guide channel, a plurality of groups of guide rollers are arranged in the guide channel, each group has two guide rollers arranged opposite to each other, and a group of guide rollers is provided corresponding to each lifting rope, the lifting rope is passed through the two guide rollers arranged opposite to each other, and the guide rollers can rotate around their own axes to drive the connecting seat to move along the lifting rope.

[0017] Preferably, a plurality of groups of guide rollers are arranged adjacent to each other along the length direction of the guide channel, and a plurality of guide rollers located on the same side of the guide channel are coaxially arranged.

[0018] Beneficial effects of the present invention:

[0019] During use of the lifting device proposed by the present invention, when the boom rotates normally (assuming that the boom moves in a first direction), the lifting rope and the hook move synchronously with the boom, but the limit rod will want to maintain its original state of motion due to its own static inertia, resulting in the change of its state of motion lagging behind the boom. This lag makes it impossible for the limit rod to change its state of motion synchronously with the boom, resulting in a certain angle between the limit rod and the boom. When the boom stops suddenly, the movement state of the boom changes instantly. Due to the inertia of the hook and the hooked object, the hook and the rope will continue to move in the first direction, thereby having a tendency to swing. At this time, the limit rod is immediately locked by the locking mechanism, and the winding member is driven to wind up the limit rope. Since the limit rod lags behind the rotation of the boom, an angle is formed between the limit rod and the boom. At this time, the limit rod and the limit rope are located in a position opposite to the first direction relative to the rope and the hook. Therefore, a pulling force in the opposite direction to the first direction is applied to the rope through the wound limit rope, which offsets the tendency of the rope and the hook to continue to move in the first direction under the action of inertia, thereby effectively reducing the swinging phenomenon and improving safety during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a first structural schematic diagram of a lifting device provided by an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0022] Figure 3 yes Figure 1 The enlarged view of point B in the middle;

[0023] Figure 4 is a second structural schematic diagram of a lifting device provided by an embodiment of the present invention;

[0024] Figure 5 yes Figure 4 Enlarged view of point C in the middle;

[0025] Figure 6 is a third structural schematic diagram of the lifting device provided by an embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the internal structure of the containing tank provided in an embodiment of the present invention.

[0027] In the figure:

[0028] 1. Lifting assembly; 11. Lifting arm; 12. Lifting rope; 13. Lifting hook; 14. Tower cap; 15. Connecting seat; 151. Guide channel; 152. Guide roller;

[0029] 2. Limiting assembly; 21. Winding member; 22. Locking mechanism; 221. Locking seat; 222. Limiting guide rod; 2221. Arc surface; 2222. Accommodating groove; 2223. Tightening spring; 2224. Locking block; 2225. Limiting end block; 23. Limiting rod; 231. First rod section; 232. Second rod section; 24. Limiting rope; 25. Guide wheel. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0034] See also Figures 1 to 7The lifting device provided in the embodiment of the present invention includes a lifting assembly 1 and a limiting assembly 2. The lifting assembly 1 includes a boom 11, a suspension rope 12 and a hook 13. The boom 11 can rotate in the horizontal direction. The suspension rope 12 is connected to the boom 11, and the suspension rope 12 is provided with a suspension hook 13. The limiting assembly 2 is provided on the boom 11. The limiting assembly 2 includes a winding member 21, a locking mechanism 22, a limiting rod 23 and a limiting rope 24. The limiting rod 23 is connected to the boom 11 and can rotate coaxially with the boom 11. One end of the limiting rope 24 is connected to the winding member 21, and the other end of the limiting rope 24 is connected to the suspension rope 12. The winding member 21 is used to release or reel in the limiting rope 24. At least part of the limiting rope 24 extends along the limiting rod 23 and is limited on the limiting rod 23. The locking mechanism 22 can limit the rotation of the limiting rod 23 relative to the boom 11.

[0035] During use, when the boom 11 rotates normally (assuming that the boom 11 moves in the first direction), the rope 12 and the hook 13 move synchronously with the boom 11, and the limit rod 23 will want to maintain its original state of motion due to its own static inertia, resulting in the change of its state of motion being relatively lagging behind the boom 11. This lag makes it impossible for the limit rod 23 to change its state of motion synchronously with the boom 11, resulting in a certain angle between the limit rod 23 and the boom 11. When the boom 11 stops suddenly, the movement state of the boom 11 changes instantly. Due to the inertia of the hook 13 and the hooked object, the hook 13 and the rope 12 will continue to move in the first direction, thereby having a tendency to swing. At this time, the limiting rod 23 is immediately locked by the locking mechanism 22, and the winding member 21 is driven to wind up the limiting rope 24. Since the limiting rod 23 lags behind the rotation of the boom 11, an angle is formed between the limiting rod 23 and the boom 11. At this time, the limiting rod 23 and the limiting rope 24 are located in a position opposite to the first direction relative to the rope 12 and the hook 13. Therefore, a pulling force opposite to the first direction is applied to the rope 12 through the wound limiting rope 24, which offsets the tendency of the rope 12 and the hook 13 to move under the action of inertia, effectively reduces the swinging phenomenon, and improves the safety during operation.

[0036] The specific structure of the lifting device is explained below.

[0037] Regarding the lifting assembly 1. A plurality of lifting ropes 12 are provided corresponding to the same lifting hook 13, so that the lifting rope 12 is evenly stressed, thereby improving the stability and safety of the lifting hook 13. Generally speaking, the boom 11 extends in the horizontal direction, the lifting rope 12 is provided at the bottom of the boom 11, extends vertically downward, and the bottom end of the lifting rope 12 is connected to the lifting hook 13. A tower cap 14 extending in the height direction is provided on the boom 11, a limiting rod 23 is connected to the tower cap 14, and a winding member 21 is provided on the upper side of the connection between the limiting rod 23 and the tower cap 14.

[0038] In this embodiment, the boom 11 is driven to rotate by a rotating mechanism, the limiting rope 24 is a steel wire rope, and the winding member 21 is a winding motor, all of which are existing equipment in the field. Their working principles and specific structures are not described in detail here.

[0039] See also Figure 2 and Figure 3 The locking mechanism 22 is used to lock the limiting rod 23 to prevent the limiting rod 23 from rotating relative to the boom 11. Specifically, the locking mechanism 22 includes a locking seat 221 and a limiting guide rod 222 extending in an arc shape. The limiting guide rod 222 forms an arc surface 2221 facing the limiting rod 23. The locking seat 221 is provided on one end of the limiting rod 23 close to the limiting guide rod 222. When the limiting rod 23 rotates, the locking seat 221 moves along the arc surface 2221. The locking seat 221 can be locked with the arc surface 2221 to limit the rotation of the limiting rod 23. Since the moving track of the end of the limiting rod 23 is in an arc shape, when the limiting rod 23 rotates, the locking seat 221 moves along the arc surface 2221 to prevent the limiting guide rod 222 from interfering with the movement of the locking seat 221. Moreover, when it is necessary to limit the rotation of the limiting rod 23, this structure can provide a stable and reliable locking effect.

[0040] See also Figure 7 , a plurality of limiting grooves are arranged at one end of the locking seat 221 facing the arc surface 2221, and a plurality of receiving grooves 2222 are arranged on the arc surface 2221 corresponding to the limiting grooves, and each receiving groove 2222 is provided with a tightening spring 2223 and a locking block 2224 from the inside to the outside, and an electromagnet is arranged on the locking seat 221. When the electromagnet is powered on, the locking block 2224 is magnetically attracted to the corresponding limiting groove, thereby locking the locking seat 221; when the electromagnet is powered off, the tightening spring 2223 drives the locking block 2224 away from the limiting groove, thereby unlocking the locking seat 221. By providing a plurality of limiting grooves and corresponding locking blocks 2224 and tightening springs 2223, the contact points and locking force during locking are increased, making the locking more firm and reliable, and being able to more effectively cope with strong inertial impact. The electromagnet realizes precise control of locking and unlocking. It is quickly magnetically locked when powered on, and automatically unlocked when powered off, with fast and accurate response, which improves the automation and operation convenience of the entire device.

[0041] Among them, multiple accommodating grooves 2222 are arranged at intervals along the extension direction of the arc surface 2221. The multi-level locking formed by the multiple accommodating grooves 2222 and the multiple limiting grooves makes it possible for the boom 11 to accelerate suddenly and stop suddenly in some cases, even if the limiting rod 23 has not reached the corresponding position in time, that is, it has not yet opened to the maximum angle, the locking seat 221 can still be locked at any position of the arc surface 2221, thereby urgently locking the limiting rod 23, playing a limiting role, and improving the adaptability and flexibility of the locking mechanism 22.

[0042] It is understandable that the electromagnet may be an existing electromagnet, and the on and off of the electromagnet may be remotely controlled by a control system, which is not limited here.

[0043] In other embodiments, a plurality of positioning grooves may be provided on the arc surface 2221, and a telescopic motor may be provided on the locking seat 221. The motor shaft of the telescopic motor may face the positioning groove. The motor shaft may be controlled by a control system to selectively extend and be inserted into the positioning groove, thereby locking the limit rod 23 and the arc surface 2221. When unlocking is required, the motor shaft may be controlled to retract and move away from the positioning groove, thereby achieving the unlocking effect, which will not be elaborated here.

[0044] More specifically, the two ends of the limiting guide rod 222 are provided with limiting end blocks 2225. The existence of the limiting end blocks 2225 provides a clear boundary limit for the movement of the locking seat 221, avoids device failure or failure due to excessive movement, and improves the safety of the locking mechanism 22.

[0045] Regarding the specific structure of the limiting rod 23, the limiting rod 23 is used to achieve the support and limiting effect of the limiting rope 24. Specifically, the limiting rod 23 is arranged at the top of the boom 11 and extends in the same direction as the boom 11, which can minimize the interference with the hoisting space and improve the space utilization rate; the limiting rod 23 includes a first rod segment 231 and a second rod segment 232, one end of the first rod segment 231 is connected to the boom 11, the other end of the first rod segment 231 is fixedly connected to one end of the second rod segment 232, and the other end of the second rod segment 232 is bent and extended in the direction close to the boom 11. The bent and extended second rod segment 232 helps to effectively guide and control the movement of the limiting rope 24, so that the limiting rope 24 is smoother during the winding and releasing process.

[0046] Specifically, a guide wheel 25 is provided at the connection between the first rod segment 231 and the second rod segment 232, and the limiting rope 24 is passed through the guide wheel 25 and is slidably connected to the guide wheel 25. The guide wheel 25 makes the movement of the limiting rope 24 stable and controllable, and can guide the limiting rope 24 to slide along a predetermined path, so as to avoid the limiting rope 24 from deflecting, twisting and other unstable conditions during operation; when the limiting rope 24 is being wound or released, the guide wheel 25 can effectively reduce the friction at the connection between the limiting rope 24 and the rod segment, reduce wear, and extend the service life of the limiting rope 24.

[0047] In addition, different numbers of guide wheels 25 may be adaptively arranged at other positions of the limiting rod 23 to further enhance the guiding effect of the limiting rope 24 , which is not limited here.

[0048] In some embodiments, a center-through limiting rod 23 may also be provided, so that the limiting rope 24 passes through the limiting rod 23 from the inside, and the limiting rod 23 itself has a limiting and guiding effect, which will not be elaborated here.

[0049] More specifically, the length of the limit rod 23 is greater than or equal to the length of the boom 11, so that the limit rod 23 can provide a larger limiting range and a stronger limiting capacity. In addition, a sufficiently long limit rod 23 can meet the requirements of booms 11 of different lengths, increase the versatility and application range of the lifting device, and enable it to play a good limiting role under various working conditions.

[0050] In the actual construction process, the hook 13 may be lowered to a narrow gap in a small space for hoisting operation. In order to prevent the limiting rope 24 from interfering with the lifting process of the lifting rope 12 and the hook 13, the lifting rope 12 is movably connected with a connecting seat 15, which is sleeved on the lifting rope 12 and can slide along the extension direction of the lifting rope 12, and the other end of the limiting rope 24 is connected to the connecting seat 15. When the hook 13 needs to be lowered or raised, the limiting rope 24 can be adjusted to the position of the lifting rope 12 by driving the connecting seat 15 to slide on the lifting rope 12, without affecting the normal lifting operation of the hook 13, and without additionally adjusting the position of the limiting rope 24, which reduces the operation steps and time, and improves the adaptability and flexibility of the limiting assembly 2.

[0051] Specifically, a guide channel 151 is formed inside the connecting seat 15, and the sling rope 12 is passed through the guide channel 151. A plurality of guide rollers 152 are arranged in the guide channel 151, and each group is provided with two guide rollers 152 arranged opposite to each other. A group of guide rollers 152 is provided for each sling rope 12, and the sling rope 12 is passed through the two guide rollers 152 arranged opposite to each other. The guide rollers 152 can rotate around their own axes to drive the connecting seat 15 to move along the sling rope 12. The plurality of guide rollers 152 arranged opposite to each other provide stable support and guidance for the sling rope 12, ensuring that the connecting seat 15 will not be skewed or stuck during movement. The way in which the guide rollers 152 rotate around their own axes to drive the connecting seat 15 to move reduces the friction between the connecting seat 15 and the sling rope 12, thereby improving the moving efficiency.

[0052] In other embodiments, the connecting seat 15 may be driven to move along the suspension rope 12 by setting up equipment such as a cylinder and an electric pump. This is not limited here, and it is only necessary to ensure that the movement of the connecting seat 15 can be achieved.

[0053] More specifically, multiple groups of guide rollers 152 are arranged adjacent to each other along the length direction of the guide channel 151, and multiple guide rollers 152 located on the same side of the guide channel 151 are coaxially arranged. The adjacently arranged guide rollers 152 are compactly arranged, saving space in the guide channel 151, making the structure of the connecting seat 15 more compact; in addition, the coaxially arranged multiple guide rollers 152 can be driven by a common drive shaft of a drive motor, saving costs, while improving the consistency of the movement of the guide rollers 152, making the lifting process of the connecting seat 15 more stable.

[0054] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A lifting device, characterized in that: include: A lifting assembly (1) comprises a lifting arm (11), a lifting rope (12) and a lifting hook (13); the lifting arm (11) is capable of rotating in a horizontal direction; the lifting rope (12) is connected to the lifting arm (11); and the lifting hook (13) is provided on the lifting rope (12); A limit assembly (2) is arranged on the suspension arm (11), the limit assembly (2) comprising a winding member (21), a locking mechanism (22), a limit rod (23) and a limit rope (24), the limit rod (23) being connected to the suspension arm (11) and being coaxially rotatable with the suspension arm (11), one end of the limit rope (24) being connected to the winding member (21), and the other end of the limit rope (24) being connected to the suspension rope (12), the winding member (21) being used to release or reel in the limit rope (24), at least a portion of the limit rope (24) extending along the limit rod (23) and being limited on the limit rod (23), the locking mechanism (22) being able to limit the limit rope (24) The rod (23) rotates relative to the boom (11); the locking mechanism (22) comprises a locking seat (221) and a limiting guide rod (222) extending in an arc shape; a circular arc surface (2221) facing the limiting rod (23) is formed on the limiting guide rod (222); a locking seat (221) is provided on one end of the limiting rod (23) close to the limiting guide rod (222); when the limiting rod (23) rotates, the locking seat (221) moves along the circular arc surface (2221); the locking seat (221) can be locked with the circular arc surface (2221) to limit the rotation of the limiting rod (23); and limiting end blocks (2225) are provided at both ends of the limiting guide rod (222).

2. The lifting device according to claim 1, characterized in that: A plurality of limiting grooves are arranged at one end of the locking seat (221) facing the arc surface (2221); corresponding to the limiting grooves, a plurality of accommodating grooves (2222) are arranged on the arc surface (2221); each of the accommodating grooves (2222) is provided with a tightening spring (2223) and a locking block (2224) from the inside to the outside; an electromagnet is arranged on the locking seat (221); when the electromagnet is powered on, the locking block (2224) is magnetically attracted to the corresponding limiting groove, thereby locking the locking seat (221); when the electromagnet is powered off, the tightening spring (2223) drives the locking block (2224) away from the limiting groove, thereby unlocking the locking seat (221).

3. The lifting device according to claim 1, characterized in that: The limiting rod (23) is arranged at the top of the boom (11) and extends in the same direction as the boom (11), the limiting rod (23) comprises a first rod section (231) and a second rod section (232), one end of the first rod section (231) is connected to the boom (11), the other end of the first rod section (231) is fixedly connected to one end of the second rod section (232), and the other end of the second rod section (232) is bent and extended in a direction close to the boom (11).

4. The lifting device according to claim 3, characterized in that: A guide wheel (25) is provided at the connection between the first rod segment (231) and the second rod segment (232), and the limiting rope (24) is passed through the guide wheel (25) and is slidably connected to the guide wheel (25).

5. The lifting device according to claim 1, characterized in that: The length of the limiting rod (23) is greater than or equal to the length of the boom (11).

6. The lifting device according to claim 1, characterized in that: The suspension rope (12) is movably connected to a connection seat (15), the connection seat (15) is sleeved on the suspension rope (12) and can slide along the extension direction of the suspension rope (12), and the other end of the limiting rope (24) is connected to the connection seat (15).

7. The lifting device according to claim 6, characterized in that A guide channel (151) is formed inside the connecting seat (15), the sling rope (12) is passed through the guide channel (151), a plurality of groups of guide rollers (152) are arranged in the guide channel (151), each group is provided with two guide rollers (152) arranged opposite to each other, and a group of guide rollers (152) is provided corresponding to each sling rope (12), the sling rope (12) is passed through the two guide rollers (152) arranged opposite to each other, and the guide rollers (152) can rotate around their own axes to drive the connecting seat (15) to move along the sling rope (12).

8. The lifting device according to claim 7, characterized in that A plurality of groups of guide rollers (152) are arranged adjacent to each other along the length direction of the guide channel (151), and a plurality of guide rollers (152) located on the same side of the guide channel (151) are coaxially arranged.

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