A lifting device for a crane
By designing a lifting device in a crane and using worm gear and worm transmission and buffer drive components, the clamping structure and cargo damage caused by the gravity of heavy objects is solved, and a safer and more economical lifting process is achieved.
Patent Information
- Application Number
- CN202411471708.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2044-10-22
AI Technical Summary
When lifting heavy objects in traditional crane lifting mechanisms, the clamping structure is easily damaged by excessive gravity of heavy objects and causes damage to fragile goods. How to avoid clamping structures and cargo damage while ensuring the stability of heavy objects becomes a problem. .
A lifting device for cranes is designed, including a lifting frame, a lifting assembly, a working group and a buffer drive assembly. The rotation ratio and reverse self-locking function are improved through the worm gear and worm transmission. The clamp is combined with the buffer arm and the load is shared by the spring and limiting assembly. Stress to prevent excessive compression of the plywood and heavy objects.
Improves the safety of the lifting process, protects fragile goods, avoids damage to the clamping structure and cargo, and reduces the cost and energy consumption of the servo motor.
Smart Images
Figure CN118978084B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of crane equipment, in particular to a lifting device for a crane. Background Art
[0002] When lifting heavy objects, traditional crane lifting mechanisms usually rely solely on the tension of the rope to maintain the stability of the heavy objects. In order to enhance the stability and safety of heavy objects during lifting, a clamping structure is introduced on the placement table. When the heavy object is placed on the placement table and the rope pulls up the placement table, the gravity of the heavy object will prompt the clamping structure to automatically fix it. However, this design concept has exposed some defects in practical applications. As the weight of the heavy object increases, the falling effect caused by its gravity also increases accordingly. When the bottom of the placement table is suspended and the rope is continuously stressed, the clamping structure will be continuously compressed by the gravity of the heavy object. The continuously applied pressure may exceed the bearing limit of the clamping structure, causing it to be damaged. Excessive clamping pressure may also cause damage to the transported goods. For example, some fragile or easily deformed goods may break, dent or lose their original performance under excessive clamping pressure. Under current technical conditions, how to optimize the design of the crane lifting mechanism so that the clamping structure can avoid damage to the clamping structure or goods due to excessive gravity of the heavy object while ensuring the stability of the heavy object has become a technical problem that needs to be solved urgently.
[0003] In view of this, we propose a lifting device for a crane to improve the deficiencies in the prior art. Summary of the invention
[0004] The object of the present invention is to provide a lifting device for a crane to solve the problems raised in the above background technology.
[0005] To achieve the above object, the present invention provides a lifting device for a crane, comprising a cantilever frame, a lifting assembly is provided on the top of the cantilever frame, a working group is provided below the lifting assembly, and a main rope and a plurality of auxiliary ropes are connected between the lifting assembly and the working group;
[0006] The working group includes a placement component, which includes at least a placement table and a pair of clamps movably connected to the two sides of the placement table away from each other, a buffer drive component is provided on the top of the two clamps, a limit component is provided between the two clamps and the placement table, and a plurality of torsion springs are coaxially connected at the connection between the two clamps and the placement table;
[0007] The placing component is used to hold the heavy objects to be transferred, and the lifting component drives the placing component to rise and fall by winding and releasing the main rope. During the process of the placing component rising and falling and the bottom being in a suspended state, several of the auxiliary ropes drive the two clamps to rotate relative to each other and approach the heavy object on the top of the placing component. When the buffer drive component contacts the heavy object, the heavy object can prevent the two buffer drive components from continuing to approach each other. The buffer drive component is used to push the limit assembly to fix the connection between the clamp and the placing table. The clamp after the position is fixed can fix the side of the heavy object, and the buffer drive component in contact with the heavy object can share the stress of absorbing the mutual squeezing between the clamp and the heavy object.
[0008] As a further improvement of the present technical solution, the lifting assembly includes a pair of limit bolts, a roller is rotatably connected between the two limit bolts, a worm wheel is coaxially connected to one side of the roller, a worm is meshed with the bottom of the worm wheel, the worm is driven by a servo motor, and the worm and the output shaft of the servo motor are coaxially connected.
[0009] As a further improvement of the present technical solution, the placement assembly also includes a pair of rotating bolts arranged on both sides of the placement table away from each other, the two clamps are provided with a rotating shaft on the side close to the placement table, both ends of the two rotating shafts are provided with a driving part, and the rotating bolts and the rotating shaft are rotatably connected.
[0010] As a further improvement of the present technical solution, the buffer drive assembly includes a pair of sliding rods slidably connected to the clamping plate, the two sliding rods are fixedly connected with a buffer arm on the side of the clamping plate away from the placing table, and the outer periphery of the two sliding rods is provided with a first spring between the buffer arm and the clamping plate.
[0011] As a further improvement of the present technical solution, the limit assembly includes several groups of limit holes on the rotating bolt and several working grooves on the clamping plate. The limit assembly also includes several wedge blocks fixedly connected to the side of the buffer arm close to the clamping plate. The wedge blocks and the working grooves are slidably connected. The inner bottom walls of several working grooves are provided with mounting grooves. The bottom of the mounting groove is slidably connected with a limit rod. The limit rod is provided with a limit cap in the mounting groove. Several second springs are provided between the limit cap and the inner bottom wall of the mounting groove.
[0012] As a further improvement of the present technical solution, one end of several of the auxiliary ropes is fixedly connected to one end of the main rope, the other end of the main rope is fixedly connected to the outer wall of the roller, and the other ends of several of the auxiliary ropes are fixedly connected to the outer wall of the driving part.
[0013] As a further improvement of the technical solution, the inner ring of the torsion spring is fixedly connected to the rotating shaft, and the outer ring of the torsion spring is fixedly connected to the rotating bolt.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. In the lifting device for the crane, a placement assembly is provided to hold the heavy objects to be transported. The lifting assembly drives the placement assembly to rise and fall by winding and releasing the main rope. Compared with the traditional lifting drive method in which the servo motor directly drives the roller to rotate, the lifting assembly of the lifting device adds a rotating structure of a worm gear and a worm, so that the lifting assembly has a larger rotation ratio and a reverse self-locking function, which improves the safety during the working process. During the lifting and lowering of the placement assembly and the bottom is in a suspended state, several auxiliary ropes drive the two clamps to rotate relative to each other and approach the heavy object at the top of the placement assembly. When the working group is lifted and the bottom is in a suspended state, the downward effect of the working group and the weight of the heavy object drives the auxiliary rope to pull the driving part so that the two clamps rotate closer to each other. When the buffer drive assembly contacts a heavy object, the heavy object can prevent the two buffer drive assemblies from continuing to approach each other. After the buffer arm contacts the side of the heavy object, the buffer arm is blocked, and the splint has a tendency to continue to rotate driven by the auxiliary rope, so that the slide bar can slide in the splint and compress the first spring at the same time. Part of the stress that originally opposed each other after the splint and the heavy object contacted can be absorbed by the first spring, thereby protecting the fragile goods and splint being transported.
[0016] 2. In the lifting device for the crane, a buffer driving assembly is provided to push the limit assembly to fix the connection between the clamp plate and the placing table. After the buffer arm is blocked by the weight, the wedge block is pushed to slide into the working groove. The bottom of the wedge block presses down one end of the limit rod, and gradually pushes the other end of the limit rod into the limit hole corresponding to the rotating bolt, thereby fixing the relative position of the placing table and the clamp plate. At the same time, the second spring is compressed. After the working group reaches the transfer position, the limit rod pushes the limit cap to reset through the restoring force of the second spring, so that the clamp plate and the placing table can resume a state of relative rotation. The clamp plate after the position is fixed can fix the position of the weight from both sides, and at the same time prevent the clamp plate and the weight from squeezing each other too much, which may cause damage to fragile goods and the clamp plate. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the charging stage of the overall structure of the present invention;
[0018] Figure 2 It is the overall structural working state diagram of the lifting stage of the present invention;
[0019] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;
[0020] Figure 4 It is a working group structure diagram of the charging stage of the present invention;
[0021] Figure 5 It is a working state diagram of the working group in the lifting stage of the present invention;
[0022] Figure 6 It is a structural diagram of the placement component of the present invention;
[0023] Figure 7 A top view of the buffer drive assembly of the present invention;
[0024] Figure 8 It is a left view of the buffer drive assembly and the limit assembly of the present invention;
[0025] Fig. 9 For the present invention Figure 8 Enlarged view of point B in the middle;
[0026] Fig.10 It is a left view of the placement component and the limiting component of the present invention.
[0027] The meaning of each number in the figure is:
[0028] 11. Overhanging frame; 12. Main rope; 13. Auxiliary rope; 14. Torsion spring;
[0029] 20. Lifting assembly; 21. Roller; 22. Worm gear; 23. Worm; 24. Servo motor;
[0030] 30. Placement assembly; 31. Placement table; 32. Clamp; 33. Rotation bolt; 34. Rotation shaft; 35. Driving unit;
[0031] 40. Buffer drive assembly; 41. Sliding rod; 42. Buffer arm; 43. First spring;
[0032] 50. Limiting assembly; 51. Wedge block; 52. Limiting rod; 53. Mounting groove; 54. Limiting cap; 55. Second spring; 56. Limiting hole; 57. Working groove. DETAILED DESCRIPTION
[0033] Example
[0034] See also Figure 1 - Fig.10 As shown, the purpose of this embodiment is to provide a lifting device for a crane, including a cantilever frame 11, a lifting assembly 20 is provided on the top of the cantilever frame 11, a working group is provided below the lifting assembly 20, and a main rope 12 and a plurality of auxiliary ropes 13 are connected between the lifting assembly 20 and the working group;
[0035] The working group includes a placement assembly 30, which includes at least a placement table 31 and a pair of clamps 32 movably connected to the two sides of the placement table 31, each of which is provided with a buffer drive assembly 40, and each of which is provided with a limit assembly 50 between the two clamps 32 and the placement table 31. The connection between the two clamps 32 and the placement table 31 is coaxially connected with a plurality of torsion springs 14;
[0036] The placement component 30 is used to hold the heavy objects to be transferred. The lifting component 20 drives the placement component 30 to rise and fall by winding and releasing the main rope 12. During the process of the placement component 30 rising and falling and the bottom being in a suspended state, several auxiliary ropes 13 drive the two clamps 32 to rotate relative to each other and approach the heavy object on the top of the placement component 30. When the buffer drive component 40 contacts the heavy object, the heavy object can prevent the two buffer drive components 40 from continuing to approach each other. The buffer drive component 40 is used to push the limit component 50 to fix the connection between the clamp 32 and the placement platform 31. The clamp 32 after the position is fixed can fix the side of the heavy object. The buffer drive component 40 in contact with the heavy object can share the stress of absorbing the mutual squeezing between the clamp 32 and the heavy object.
[0037] Working principle: When the bottom of the working group is not suspended, the heavy goods to be transferred are stacked on the placing platform 31, and then the lifting assembly 20 is started to wind the main rope 12 to pull up the working group. Due to the falling effect of the working group and the gravity of the heavy object, the auxiliary ropes 13 of the driving part 35 wound on the rotating shaft 34 drive the two clamping plates 32 to rotate. In the process of the two clamping plates 32 rotating relative to each other and gradually approaching, the buffer driving assembly 40 is blocked by the heavy object and slides relative to the clamping plates 32 that continue to rotate. The compressed buffer driving assembly 40 absorbs the stress of the clamping plates 32 and the goods squeezing each other, and at the same time pushes the limit assembly 50 to lock the movable connection between the placing platform 31 and the clamping plates 32.
[0038] like Figure 7 As shown, firstly, the specific structure of the buffer drive assembly 40 is disclosed. The buffer drive assembly 40 includes a pair of slide bars 41 slidably connected to the clamping plate 32. The two slide bars 41 are fixedly connected to a buffer arm 42 on one side of the clamping plate 32 away from the placing platform 31. The outer periphery of the two slide bars 41 is sleeved with a first spring 43 between the buffer arm 42 and the clamping plate 32.
[0039] Furthermore, when the working group is lifted and the bottom is suspended, the downward force of the working group and the weight drives the auxiliary rope 13 to pull the driving part 35 so that the two clamping plates 32 rotate and approach each other. After the buffer arm 42 contacts the side of the weight, the buffer arm 42 is blocked, and the clamping plate 32 has a tendency to continue to rotate driven by the auxiliary rope 13, so that the slide bar 41 can slide in the clamping plate 32 and compress the first spring 43 at the same time. Part of the stress that originally resisted each other after the clamping plate 32 and the weight contacted can be absorbed by the first spring 43, so that the fragile goods being transported and the clamping plate 32 can be protected.
[0040] Figure 8 - Fig.10 The working state of the buffer drive assembly 40 and the limit assembly 50 cooperating with each other is shown. The specific structure of the limit assembly 50 is disclosed below. The limit assembly 50 includes a plurality of groups of limit holes 56 provided on the rotating bolt 33 and a plurality of working grooves 57 provided on the clamping plate 32. The limit assembly 50 also includes a plurality of wedge blocks 51 fixedly connected to the side of the buffer arm 42 close to the clamping plate 32. The wedge blocks 51 are slidably connected to the working grooves 57. The inner bottom walls of the plurality of working grooves 57 are all provided with mounting grooves 53. The bottom of the mounting groove 53 is slidably connected to a limit rod 52. The limit rod 52 is provided with a limit cap 54 in the mounting groove 53. A plurality of second springs 55 are provided between the limit cap 54 and the inner bottom wall of the mounting groove 53.
[0041] Furthermore, after the buffer arm 42 is blocked by the heavy object, it pushes the wedge block 51 to slide into the working groove 57. The bottom of the wedge block 51 presses down one end of the limit rod 52, and gradually pushes the other end of the limit rod 52 into the limit hole 56 corresponding to the rotating bolt 33, thereby fixing the relative position of the placement table 31 and the splint 32. At the same time, the second spring 55 is compressed. After the working group reaches the transfer position, the limit rod 52 pushes the limit cap 54 to reset through the restoring force of the second spring 55, so that the splint 32 and the placement table 31 can resume the state of relative rotation. After the position is fixed, the splint 32 can fix the position of the heavy object from both sides, and at the same time prevent the splint 32 and the heavy object from squeezing each other too much, which causes damage to fragile goods and the splint 32.
[0042] The cargo transported by the crane is generally heavy. When lifting heavy cargo, if there is a sudden power failure or a failure of the servo motor 24, the heavy cargo will fall together with the placement platform 31, which will cause great danger to the surrounding personnel.
[0043] Figure 1 - Figure 3The position and working state of the lifting assembly 20 are shown. The lifting assembly 20 includes a pair of limit bolts, a roller 21 is rotatably connected between the two limit bolts, a worm gear 22 is coaxially connected to one side of the roller 21, a worm 23 is meshed at the bottom of the worm gear 22, the worm 23 is driven by a servo motor 24, and the worm 23 and the output shaft of the servo motor 24 are coaxially connected.
[0044] The improvement is that the transmission of the worm wheel 22 and the worm 23 has a large transmission ratio, which can achieve deceleration and torque increase. This means that a servo motor 24 with a relatively small power can be used to drive the lifting of a relatively large load, reducing the cost and energy consumption of the servo motor 24. At the same time, the transmission of the worm wheel 22 and the worm 23 has a self-locking characteristic, that is, under certain conditions, only the worm 23 can drive the worm wheel 22, and the worm wheel 22 cannot drive the worm 23. This characteristic can prevent the placement platform 31 from falling by itself under the action of the load.
[0045] When the bottom of the placing platform 31 is suspended and the main rope 12 and the auxiliary rope 13 are continuously stressed, the clamping plate 32 will be constantly pressed by the weight of the heavy object. When the continuously applied pressure exceeds the bearing limit of the clamping plate 32, it will be damaged. In addition, excessive clamping pressure will also cause damage to the goods being transported;
[0046] like Figure 6 As shown, the placement assembly 30 also includes a pair of rotating bolts 33 arranged on both sides of the placement platform 31 away from each other, and the two clamps 32 are provided with a rotating shaft 34 on the side close to the placement platform 31. Both ends of the two rotating shafts 34 are provided with a driving part 35, and the rotating bolts 33 and the rotating shaft 34 are rotatably connected.
[0047] The improvement lies in that when the placement table 31 is lifted, the two clamps 32 are driven by the auxiliary rope 13 to rotate closer to each other. Once the goods come into contact with the buffer drive assembly 40, the buffer drive assembly 40 will push the limit assembly 50 to lock the movable connection between the placement table 31 and the clamps 32. While preventing the heavy object from sliding off the placement table 31, it can also prevent excessive squeezing between the heavy object and the clamps 32, causing damage to both.
[0048] In order to achieve: when the working group is in the lifting stage with the bottom suspended and not stressed, the two clamping plates 32 automatically approach each other to fix the heavy object, and when the working group is in the loading stage with the bottom not suspended and stressed, the two clamping plates 32 can automatically reset;
[0049] Figure 1 and Figure 2The diagram shows the working states of the main rope 12 and the plurality of auxiliary ropes 13 when the working group is in the two states of bottom suspension and bottom non-suspension. One end of the plurality of auxiliary ropes 13 is fixedly connected to one end of the main rope 12, the other end of the main rope 12 is fixedly connected to the outer wall of the roller 21, and the other ends of the plurality of auxiliary ropes 13 are fixedly connected to the outer wall of the driving part 35.
[0050] like Figure 4 and Figure 5 As shown, the inner ring of the torsion spring 14 is fixedly connected to the rotating shaft 34 , and the outer ring of the torsion spring 14 is fixedly connected to the rotating bolt 33 .
[0051] The improvement is that when the working group is in the lifting stage, the placing platform 31 is subjected to the downward force of the weight, the auxiliary rope 13 originally wound on the driving part 35 is loosened, and the rotating shafts 34 of the two clamping plates 32 are driven by the auxiliary rope 13, so that the two clamping plates 32 are relatively rotated and approached, and the torsion spring 14 is stretched at this time, so that the auxiliary rope 13 wound on the driving part 35 will not be loosened too fast. When the working group is in the loading stage, the driving part 35 loses the downward driving force of the weight, and the clamping plate 32 will be reset under the action of the restoring force of the torsion spring 14.
[0052] In summary, the working principle of this scheme is as follows: when the bottom of the placing platform 31 is in a non-suspended state, the heavy goods to be transferred are stacked on the placing platform 31. Then the servo motor 24 is started to drive the roller 21 to rotate, and the roller 21 winds the main rope 12 to pull up the placing platform 31. Due to the falling effect of the placing platform 31 and the gravity of the heavy objects, the auxiliary ropes 13 of the driving part 35 wound around the rotating shaft 34 drive the two clamping plates 32 to rotate. As the two splints 32 rotate relative to each other and gradually approach each other, after the buffer arm 42 contacts the side of the heavy object, the buffer arm 42 is blocked, and the splint 32 tends to continue to rotate driven by the auxiliary rope 13, so that the slide bar 41 can slide in the splint 32 and compress the first spring 43 at the same time. A part of the stress that originally opposed each other after the splint 32 and the heavy object contacted can be absorbed by the first spring 43, thereby protecting the fragile goods being transported and the splint 32. At this time, the torsion spring 14 is stretched, so that the auxiliary rope 13 wrapped around the driving part 35 will not loosen too fast.
[0053] After the buffer arm 42 is blocked by the heavy object, it pushes the wedge block 51 to slide into the working groove 57. The bottom of the wedge block 51 presses down one end of the limit rod 52, and gradually pushes the other end of the limit rod 52 into the limit hole 56 corresponding to the rotating bolt 33, thereby fixing the relative position of the placement table 31 and the splint 32. At the same time, the second spring 55 is compressed. After the working group reaches the transfer position, the limit rod 52 pushes the limit cap 54 to reset through the restoring force of the second spring 55, so that the splint 32 and the placement table 31 can resume the state of relative rotation. After the position is fixed, the splint 32 can fix the position of the heavy object from both sides, and at the same time prevent the splint 32 and the heavy object from squeezing each other too much, which causes damage to fragile goods and the splint 32.
[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall 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 for a crane, characterized in that: It comprises an elevated frame (11), wherein a lifting assembly (20) is provided on the top of the elevated frame (11), a working group is provided below the lifting assembly (20), and a main rope (12) and a plurality of auxiliary ropes (13) are connected between the lifting assembly (20) and the working group; The working group comprises a placement component (30), the placement component (30) comprising at least a placement table (31) and a pair of clamping plates (32) movably connected to two sides of the placement table (31) away from each other, a buffer drive component (40) is provided on the top of each of the two clamping plates (32), a limit component (50) is provided between each of the two clamping plates (32) and the placement table (31), and a plurality of torsion springs (14) are coaxially connected at the connection between the two clamping plates (32) and the placement table (31); The placing component (30) is used to hold the heavy objects to be transported. The lifting component (20) drives the placing component (30) to rise and fall by winding and releasing the main rope (12). During the process of the placing component (30) rising and falling and the bottom being in a suspended state, a plurality of the auxiliary ropes (13) drive the two clamping plates (32) to rotate relative to each other and approach the heavy objects on the top of the placing component (30). When the buffer drive component (40) contacts the heavy objects, the heavy objects can prevent the two buffer drive components (40) from continuing to approach each other. The buffer drive component (40) is used to push the limiter component (50) to fix the connection between the clamping plates (32) and the placing platform (31). After the position is fixed, the clamping plates (32) can fix the side of the heavy objects. The buffer drive component (40) in contact with the heavy objects can share and absorb the stress of mutual compression between the clamping plates (32) and the heavy objects. The lifting assembly (20) comprises a pair of limit bolts, a roller (21) is rotatably connected between the two limit bolts, a worm wheel (22) is coaxially connected to one side of the roller (21), a worm (23) is meshed at the bottom of the worm wheel (22), the worm (23) is driven by a servo motor (24), and the worm (23) and the output shaft of the servo motor (24) are coaxially connected; the placement assembly (30) further comprises a pair of rotating bolts (33) arranged on two sides away from each other of the placement platform (31), a rotating shaft (34) is provided on one side of the two clamping plates (32) close to the placement platform (31), driving parts (35) are provided at both ends of the two rotating shafts (34), and the rotating bolts (33) and the rotating shaft (34) are rotatably connected; The buffer drive assembly (40) comprises a pair of slide bars (41) slidably connected to the clamping plate (32), the two slide bars (41) being fixedly connected to a buffer arm (42) on a side of the clamping plate (32) away from the placing platform (31), and the outer periphery of the two slide bars (41) is provided with a first spring (43) between the buffer arm (42) and the clamping plate (32); the limit assembly (50) comprises a plurality of groups of limit holes (56) formed on the rotating bolt (33) and a plurality of working grooves (57) formed on the clamping plate (32), the limit The assembly (50) further comprises a plurality of wedge blocks (51) fixedly connected to a side of the buffer arm (42) close to the clamping plate (32); the wedge blocks (51) are slidably connected to the working grooves (57); the inner bottom walls of the plurality of working grooves (57) are provided with mounting grooves (53); the bottom of the mounting groove (53) is slidably connected with a limiting rod (52); the limiting rod (52) is provided with a limiting cap (54) in the mounting groove (53); and a plurality of second springs (55) are provided between the limiting cap (54) and the inner bottom wall of the mounting groove (53).
2. The lifting device for a crane according to claim 1, characterized in that: One end of each of the auxiliary ropes (13) is fixedly connected to one end of the main rope (12), the other end of the main rope (12) is fixedly connected to the outer wall of the roller (21), and the other end of each of the auxiliary ropes (13) is fixedly connected to the outer wall of the driving part (35).
3. The lifting device for a crane according to claim 1, characterized in that: The inner ring of the torsion spring (14) is fixedly connected to the rotating shaft (34), and the outer ring of the torsion spring (14) is fixedly connected to the rotating bolt (33).