Multi-curved-surface-groove traction rope electric hoist with unlimited rope length

Abstract

The utility model discloses a traction rope electric hoist with multiple curved surface grooves and unlimited rope length, which belongs to the field of electric hoists, solves the problems that the rope skipping phenomenon easily occurs in a traction rope, and the shearing force borne by the traction rope is larger, and adopts the technical scheme that the traction rope electric hoist mainly comprises a shell, a pressing wheel assembly, two rollers and a driving mechanism, the rollers are provided with multiple circles of rope grooves, the pressing wheel assembly acts on the traction rope so that the traction rope can be kept tensioned, one end of the traction rope is a traction end for hanging a heavy object, the other end of the traction rope is a free end, the rope grooves are formed in the circumferential direction of the rollers, the multiple circles of rope grooves are arranged in the axial direction of the rollers, and the multiple circles of rope grooves in at least one roller comprise a plurality of straight grooves and at least two curved surface grooves. In the winding process of the pulling rope, the rope groove before the pulling rope enters the curved surface grooves is a straight groove, the rope groove after the pulling rope is separated from the curved surface grooves is a straight groove, and at least one straight groove is formed between every two adjacent curved surface grooves in the same roller. According to the utility model, the traction rope passes through the groove smoothly, and the shearing force borne by the traction rope is reduced.

Description

Technical Field

[0001] The utility model discloses a traction rope electric hoist with a multi-curved surface groove and unlimited rope length, belonging to the technical field of electric hoists. Background Technique

[0002] An electric hoist is a lifting device integrating a motor, a friction roller and a rope storage roller. During the use of the electric hoist, the rope storage roller is used to provide the tension of the steel wire rope on the one hand and wind the steel wire rope on the other hand. When the electric hoist is used in a high-altitude environment, in order to meet the lifting height of the electric hoist, the rope storage roller is usually increased to increase the length of the steel wire rope. However, the longer the length of the steel wire rope during high-altitude operation, the more layers of winding on the rope storage roller, and at this time, the steel wire rope is more likely to get stuck, and at the same time, the burden on the motor will be greater.

[0003] In order to get rid of the limitation of the length of the steel wire rope, there is a traction device with unlimited rope length in the prior art. For example, a patent CN214606956U discloses an electric traction device, including a traction rope, a spiral pulley, a rope groove pulley and an outlet rope pressing wheel. The traction rope passes through the frame and is wound according to the rotation direction of the rope groove pulley and the spiral pulley, and then passes out from the outlet of the casing. In addition, the outlet rope pressing wheel presses on the surface of the rope groove pulley to generate resistance to the traction rope, so that a tension is generated between the traction rope on the spiral pulley and the rope groove pulley, so that the traction rope is kept in a tensioned state to achieve the purpose of pulling heavy objects.

[0004] In the above patent, the rope groove pulley is provided with a first curved annular groove and a second curved annular groove, and the first curved annular groove and the second curved annular groove are arranged along the axial direction of the raw groove pulley. During the winding process of the traction rope, the traction rope enters the spiral groove of the spiral pulley after leaving the first curved annular groove, and enters the second curved annular groove after passing through the spiral groove. Since both the first curved annular groove and the second curved annular groove are curved surface grooves, when entering or leaving the curved surface groove, the traction rope will form a large bending angle between the two drums. When the traction rope leaves the curved surface groove, passes through the spiral groove and then directly enters the curved surface groove, the traction rope will form a large bending angle between the spiral groove and the two curved surface grooves, which may cause the traction rope to fail to be smoothly embedded in the curved surface groove or the spiral groove, and it is easy to have a skipping phenomenon, with a large potential safety hazard; in addition, the traction rope will also be subjected to a large shearing force, which is likely to affect the service life of the traction rope. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problem that the traction rope is prone to skipping phenomenon and the shearing force on the traction rope is large. For this reason, a traction rope electric hoist with a multi-curved surface groove and unlimited rope length is provided. The curved surface grooves are arranged at intervals, so that the traction rope can pass through the groove smoothly and the shearing force on the traction rope is reduced.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A multi-curved groove endless-rope-length traction rope electric hoist, comprising a machine shell, a pressure wheel assembly, two drums installed on the machine shell, and a driving mechanism for driving the two drums. The two drums are in transmission connection to achieve synchronous rotation. A multi-turn rope groove for winding the traction rope is provided on the drum. The pressure wheel assembly acts on the traction rope to keep the traction rope taut. One end of the traction rope is a traction end for hanging a heavy object, and the other end is a free end. The rope groove is arranged circumferentially around the drum, and the multi-turn rope grooves are arranged axially along the drum. The multi-turn rope grooves in at least one drum include a plurality of straight grooves and at least two curved grooves. During the winding process of the traction rope, the rope groove before the traction rope enters the curved groove is a straight groove, and the rope groove that the traction rope enters after leaving the curved groove is a straight groove. And there is at least one straight groove between two adjacent curved grooves in the same drum.

[0008] The beneficial effects of adopting the utility model are as follows:

[0009] In the utility model, the rope groove includes a straight groove and a curved groove. At least two curved grooves are provided in at least one drum, and there is at least one straight groove between the two curved grooves. In addition, during the winding process of the traction rope, the rope groove before the traction rope enters the curved groove is a straight groove, and the rope groove that the traction rope enters after leaving the curved groove is a straight groove. When the traction rope leaves one of the curved grooves and enters the straight groove of another drum, after passing through this rope groove, the traction rope enters another straight groove, that is, the straight groove in the drum corresponds to at most one curved groove. The traction rope will form at most one relatively large bending angle between one rope groove and its corresponding two rope grooves. Furthermore, the degree of bending of the traction rope can be reduced, the shear force received by the traction rope can be reduced, which helps to extend the service life of the traction rope. In addition, the bending angle of the traction rope is reduced, which can make the traction rope enter the next rope groove more smoothly, make the traction rope pass through the groove more smoothly, reduce the possibility of the traction rope skipping the groove, and help to improve the running safety of the electric hoist.

[0010] Preferably, the number of rope grooves in the two drums is equal, and the groove openings of the rope grooves in one drum are aligned with the groove openings of the rope grooves in the other drum.

[0011] Preferably, the number of rope grooves in the two drums is equal, and the notches of the rope grooves in one drum are staggered with the notches of the rope grooves in the other drum. With the above technical solution, during the winding process of the traction rope, the traction rope extends from the wire entry and wire exit of one rope groove to two adjacent rope grooves of the other drum, respectively, and the notches of the rope grooves of one drum are staggered with the notches of the rope grooves of the other drum, that is, the rope groove of one drum is located between two adjacent rope grooves in the other drum, so that when the traction rope enters the rope groove at the wire entry position or leaves the rope groove at the wire exit position, the maximum bending angle of the traction rope between the two drums can be reduced, thereby making the traction rope pass through the grooves smoother and reducing the possibility of rope skipping.

[0012] Preferably, two curved grooves are provided in one of the rollers, and a straight groove is provided between the two curved grooves.

[0013] Preferably, the groove depth of the rope groove is h, the diameter of the traction rope is d, and 1.3d≤h≤1.7d. The above technical solution is adopted so that the traction rope can be completely in the rope groove, thereby increasing the contact area between the traction rope and the curved groove, increasing the friction between the traction rope and the curved groove, reducing the possibility of the traction rope slipping, and significantly improving the load capacity of the traction rope; when h>1.7d, the diameter of the traction rope is too small relative to the groove depth of the rope groove, which may be that the diameter of the traction rope is too small, affecting the overall strength of the traction rope; while ensuring the integrity of the traction rope, the depth of the rope groove is too large, which will increase the overall volume of the drum and increase the manufacturing cost of the drum; when h<1.3d, while the diameter of the traction rope remains unchanged, the groove depth of the rope groove is small, the traction rope is easy to get out of the rope groove, and then the rope skipping phenomenon is easy to occur, which poses a great safety hazard; while ensuring the sufficient depth of the rope groove, the diameter of the traction rope is large, thereby making the width of the rope groove large, thereby reducing the number of rope grooves on the drum, affecting the load capacity of the traction rope.

[0014] Preferably, the bottom of the rope groove is in an arc shape, the diameter of the bottom of the groove is L, the diameter of the traction rope is d, and L = d. By adopting the above technical solution, the bottom of the rope groove can match the structure of the traction rope, so that the traction rope can keep in contact with the bottom of the groove, thereby greatly increasing the contact area between the traction rope and the bottom of the groove, increasing the friction between the traction rope and the rope groove, and thus significantly improving the load capacity of the traction rope.

[0015] Preferably, the included angle between the two groove walls of the curved groove is the groove surface expansion angle A, and 15° ≤ A ≤ 20°. With the foregoing technical solution, while ensuring that the traction rope can stably transition into the curved groove, it can also increase the contact area between the curved groove and the groove wall, thereby increasing the friction force between the curved groove and the traction rope, enabling the traction rope to have a greater load capacity; when A > 20°, the inclination angles of the two groove walls are relatively gentle, which will reduce the contact area between the traction rope and the groove wall, reduce the friction force between the curved groove and the traction rope, and thus reduce the load capacity of the traction rope; when A < 15°, when A < 15°, the two groove walls of the curved groove are close to perpendicular to the axial direction of the drum, which will reduce the notch width of the curved groove. When the traction rope enters or exits the curved groove, the groove wall of the curved groove is likely to obstruct the traction rope, causing the traction rope to generate a greater bending angle, resulting in the traction rope being prone to skipping.

[0016] Preferably, the included angle between the two groove walls of the straight groove is the groove surface expansion angle B, and 30° ≤ B ≤ 40°. With the foregoing technical solution, the straight groove can have a wider notch, and the notch of the straight groove can provide a greater avoidance space for the traction rope, enabling the traction rope to stably enter or exit the curved groove, making the passing of the traction rope through the groove smoother. At the same time, after increasing the groove surface expansion angle of the straight groove, the groove surface expansion angle of the curved groove can be maintained within a smaller range, so as to facilitate increasing the friction force between the curved groove and the traction rope.

[0017] Other features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes the present utility model with reference to the drawings:

[0019] Figure 1 is a schematic structural view of a multi-curved-groove rope-unlimited traction rope electric hoist of the present utility model;

[0020] Figure 2 is a side view of a multi-curved-groove rope-unlimited traction rope electric hoist of the present utility model;

[0021] Figure 3 is a side view of a multi-curved-groove rope-unlimited traction rope electric hoist of the present utility model without the traction rope;

[0022] Figure 4 is a side view of a drum in a multi-curved-groove rope-unlimited traction rope electric hoist of the present utility model;

[0023] Figure 5 is a cross-sectional view of a drum in a multi-curved-groove rope-unlimited traction rope electric hoist of the present utility model;

[0024] Figure 6 This is a cross-sectional view of the drum and the towing rope in an electric hoist with a multi-curved groove and an unlimited rope length towing rope of the present utility model;

[0025] Figure 7 This is a side view of the second embodiment of the present utility model.

[0026] Reference numerals: 1, housing; 2, drive mechanism; 21, reduction gearbox; 31, first drum; 311, first gear; 312, first transmission shaft; 32, second drum; 321, second gear; 33, rope groove; 331, curved groove; 332, straight groove; 333, groove bottom; 4, pressure wheel assembly; 41, pressure wheel; 42, rotating shaft; 43, reset member; 5, towing rope; 51, towing end; 52, free end. Detailed implementation manners

[0027] The technical solutions of the embodiments of the present utility model will be explained and described below with reference to the accompanying drawings of the embodiments of the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0028] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise clearly defined.

[0030] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] Embodiment 1:

[0032] As Figures 1 to 6 shown, this embodiment shows an electric hoist with a traction rope 5 of unlimited rope length, including a machine shell 1, a pressure wheel assembly 4, two drums installed on the machine shell 1, and a driving mechanism 2 for driving the two drums. The two drums are in transmission connection to achieve synchronous rotation. A multi-turn rope groove 33 for winding the traction rope 5 is provided on the drum. The pressure wheel assembly 4 acts on the traction rope 5 to keep the traction rope 5 taut. One end of the traction rope 5 is a traction end 51 for hanging a heavy object, and the other end is a free end 52. The rope groove 33 is arranged circumferentially around the drum, and the multi-turn rope grooves 33 are arranged axially along the drum. The multi-turn rope grooves 33 in at least one drum include several straight grooves 332 and at least two curved grooves 331. During the winding process of the traction rope 5, the rope groove 33 before the traction rope 5 enters the curved groove 331 is a straight groove 332, and the rope groove 33 that the traction rope 5 enters after leaving the curved groove 331 is a straight groove 332, and there is at least one straight groove 332 between two adjacent curved grooves 331 in the same drum.

[0033] In this embodiment, the rope groove 33 includes a straight groove 332 and a curved groove 331. There are at least two curved grooves 331 provided in at least one drum, and there is at least one straight groove 332 between the two curved grooves 331. In addition, during the winding process of the traction rope 5, the rope groove 33 before the traction rope 5 enters the curved groove 331 is a straight groove 332, and the rope groove 33 that the traction rope 5 enters after leaving the curved groove 331 is also a straight groove 332. When the traction rope 5 leaves one of the curved grooves 331 and enters the straight groove 332 of another drum, after passing through this rope groove 33, the traction rope 5 enters another straight groove 332, that is, the straight groove 332 in the drum corresponds to at most only one curved groove 331. The traction rope 5 will form at most only one relatively large bending angle between one rope groove 33 and the two corresponding rope grooves, thereby reducing the degree of bending of the traction rope 5, reducing the shear force received by the traction rope 5, and helping to extend the service life of the traction rope 5; in addition, the bending angle of the traction rope 5 is reduced, which can make the traction rope 5 enter the next rope groove 33 more smoothly, make the passing of the traction rope 5 through the groove more smooth, reduce the possibility of the traction rope 5 skipping the groove, and help to improve the operating safety of the electric hoist.

[0034] As Figure 1and Figure 2 As shown, in this embodiment, the two drums are respectively a first drum 31 and a second drum 32. A first transmission shaft 312 is disposed through the first drum 31. The first drum 31 and the first transmission shaft 312 are in spline fit to achieve synchronous rotation of the first drum 31 and the first transmission shaft 312. A second transmission shaft is disposed through the second drum 32. The second drum 32 and the second transmission shaft are in spline fit to achieve synchronous rotation of the second drum 32 and the second transmission shaft. In addition, the output end of the driving mechanism 2 is in transmission connection with a speed reducer 21. One end of the speed reducer 21 away from the driving mechanism 2 is in transmission connection with the first transmission shaft 312. The first transmission shaft 312 is in transmission connection with the second transmission shaft. The driving mechanism 2 drives the first transmission shaft 312 to rotate through the speed reducer 21, and then drives the first drum 31 to rotate. During the rotation of the first transmission shaft 312, the second transmission shaft is driven to rotate, and then the second drum 32 is driven to rotate, so as to achieve synchronous rotation of the first drum 31 and the second drum 32.

[0035] In addition, in this embodiment, a first gear 311 is fixedly installed on one side of the first rotating shaft away from the driving mechanism 2. A second gear 321 is fixedly installed at the same end of the second rotating shaft and the first rotating shaft. A transmission gear is rotatably disposed in the machine housing 1. The transmission gear is between the first gear 311 and the second gear 321, and the transmission gear is simultaneously engaged with the first gear 311 and the second gear 321. The first gear 311 drives the second gear 321 to rotate synchronously through the transmission gear, so as to achieve synchronous and same-direction rotation of the first drum 31 and the second drum 32. During the winding process of the towing rope 5, the towing rope 5 winds along the rope groove 33 of the second drum 32, and then the towing rope 5 disengages from the rope groove 33 of the second drum 32 and enters the rope groove 33 of the first drum 31, and winds along the rope groove 33 of the first drum 31. Then the towing rope 5 disengages from the rope groove 33 of the first drum 31 and returns to the rope groove 33 of the second drum 32. After the towing rope 5 is repeatedly wound between the first drum 31 and the second drum 32, the towing end 51 of the towing rope 5 disengages from the rope groove 33 of the second drum 32 and extends vertically downward, and the free end 52 of the towing rope 5 disengages from the rope groove 33 of the first drum 31 and extends vertically downward.

[0036] Of course, it can be understood that in other embodiments, the first gear 311 and the second gear 321 may also be directly meshed to achieve a transmission connection, thereby eliminating the need for a transmission gear. The drive mechanism 2 drives the first transmission shaft 312 to rotate, and the first gear 311 on the first transmission shaft 312 rotates accordingly. At the same time, the first gear 311 drives the second gear 321 to rotate, and the second gear 321 drives the second drum 32 to rotate, thereby realizing the synchronous reverse rotation of the first drum 31 and the second drum 32. The towing rope 5 is wound in an "8" shape around the first drum 31 and the second drum 32. This winding method can increase the contact area between the towing rope 5 and the rope groove 33, thereby increasing the friction between the towing rope 5 and the rope groove 33 and enabling the towing rope 5 to have a greater load-bearing capacity.

[0037] As Figure 2 and Figure 3 shown, in this embodiment, the rope groove 33 is arranged around the circumference of the drum. Multiple turns of the rope groove 33 are arranged around the drum, and the multiple turns of the rope groove 33 are arranged along the axial direction of the drum. The rope groove 33 in the first drum 31 includes a straight groove 332 and a curved groove 331. The curved groove 331 includes two annular wall surfaces in a wavy curve. The number of rope grooves 33 in the first drum 31 is the same as the number of rope grooves 33 in the second drum 32, and the notch of the rope groove 33 in the first drum 31 is aligned with the notch of the rope groove 33 in the second drum 32. There are two curved grooves 331 in the first drum 31, and there is a straight groove 332 between the two curved grooves 331. Only the straight groove 332 is provided in the second drum 32. During the winding process of the towing rope 5, it is wound turn by turn from the left side to the right side of the first drum 31 and the second drum 32. When the towing rope 5 winds to the straight groove 332 in the second drum 32 that is aligned with the curved groove 331, the towing rope 5 can directly enter the curved groove 331 of the first drum 31 after leaving this straight groove 332. Since the notch of the straight groove 332 is aligned with the notch of the curved groove 331, during the process of the towing rope 5 entering the curved groove 331 from the straight groove 332, the bending angle of the towing rope 5 due to the curved groove 331 is relatively small, so that the towing rope 5 can enter the curved groove 331 more smoothly along the groove, making the towing rope 5 pass through the groove more smoothly and reducing the possibility of the towing rope 5 skipping the groove.

[0038] In addition, when the towing rope 5 disengages from the curved groove 331 and enters the straight groove 332 of the second roller 32, the straight groove 332 of the second roller 32 has an inlet portion for the towing rope 5 to enter. After that, the towing rope 5 winds around the straight groove 332 for nearly half a turn and then disengages from the straight groove 332 and enters the straight groove 332 adjacent to the curved groove 331 in the first roller 31. At this time, the straight groove 332 of the second roller 32 has an outlet portion for the towing rope 5 to disengage. There is a straight groove 332 between two adjacent curved grooves 331 in the first roller 31. That is, after the towing rope 5 passes through the straight groove 332 of the second roller 32, at most only a large bending angle will be formed between the two rollers, which can reduce the degree of bending of the towing rope 5, reduce the shear force received by the towing rope 5, and help extend the service life of the towing rope 5. In addition, when the bending angle of the towing rope 5 is reduced, the towing rope 5 can enter the next rope groove 33 more smoothly, making the towing rope 5 pass through the groove more smoothly, reducing the possibility of the towing rope 5 skipping the groove, and helping to improve the operating safety of the electric hoist.

[0039] Of course, it can be understood that in other embodiments, the number of curved grooves 331 in the first roller 31 can also be more than two, or the number of straight grooves 332 between two adjacent curved grooves 331 can also be two or more; or, in other embodiments, there can also be at least two curved grooves 331 provided only in the second roller 32.

[0040] Of course, it can be understood that in other embodiments, both the first roller 31 and the second roller 32 can be provided with curved grooves 331. It should be noted that when the second roller 32 is also provided with curved grooves 331, the inlet portion and the outlet portion of the curved grooves 331 in the second roller 32 both correspond to the straight grooves 332 of the first roller 31. Similarly, the inlet portion and the outlet portion of the curved grooves 331 in the first roller 31 also both correspond to the straight grooves 332 of the second roller 32. The towing rope 5 transitions between the curved grooves 331 and the straight grooves 332, which can reduce the bending angle of the towing rope 5 caused by the curved grooves 331 and make the towing rope 5 pass through the groove more smoothly.

[0041] Such as Figures 4 to 6As shown in the figure, in this embodiment, the groove depth h of the rope groove 33, the diameter of the traction rope 5 is d, and 1.3d ≤ h ≤ 1.7d. With the above design, the traction rope 5 can be completely located within the rope groove 33, thereby increasing the contact area between the traction rope 5 and the curved groove 331, increasing the friction between the traction rope 5 and the curved groove 331, reducing the possibility of the traction rope 5 slipping, and significantly improving the load capacity of the traction rope 5. When h > 1.7d, the diameter of the traction rope 5 is relatively too small compared to the groove depth of the rope groove 33, which may mean that the diameter of the traction rope 5 is too small, affecting the overall strength of the traction rope 5. While ensuring the integrity of the traction rope 5, if the depth of the rope groove 33 is too large, it will increase the overall volume of the drum and raise the manufacturing cost of the drum. When h < 1.3d, with the diameter of the traction rope 5 remaining unchanged, the groove depth of the rope groove 33 is relatively small, and the traction rope 5 is likely to disengage from the rope groove 33, thus prone to the phenomenon of skipping the rope, presenting a significant safety hazard. While ensuring the sufficient depth of the rope groove 33, if the diameter of the traction rope 5 is large, it will increase the width of the rope groove 33, thereby reducing the number of rope grooves 33 on the drum and affecting the load capacity of the traction rope 5.

[0042] In addition, in this embodiment, the bottom 333 of the rope groove 33 is arc-shaped, the diameter of the bottom 333 is L, the diameter of the traction rope 5 is d, and L = d. The structure of the bottom 333 of the rope groove 33 matches that of the traction rope 5. After the traction rope 5 is inserted into the rope groove 33, the traction rope 5 can be kept in close contact with the bottom 333, thereby greatly increasing the contact area between the traction rope 5 and the bottom 333, increasing the friction between the traction rope 5 and the rope groove 33, and significantly improving the load capacity of the traction rope 5. In addition, after the traction rope 5 is kept in close contact with the bottom 333 of the rope groove 33, the bottom 333 can also limit the position of the traction rope 5, preventing the traction rope 5 from shifting in the axial direction of the drum, so that the traction rope 5 can maintain effective static friction with the rope groove 33, reducing the possibility of the traction rope 5 slipping with the drum, and thus greatly improving the safety of using the electric hoist.

[0043] As Figure 5As shown in the figure, in this embodiment, the included angle between the two groove walls of the curved groove 331 is the groove surface expansion angle A, and 15° ≤ A ≤ 20°. With the above design, while ensuring that the traction rope 5 can stably transition into the curved groove 331, it can also increase the contact area between the curved groove 331 and the groove wall, thereby increasing the friction force between the curved groove 331 and the traction rope 5, enabling the traction rope 5 to have a greater load-bearing capacity. Additionally, the two groove walls of the curved groove 331 can also effectively limit the traction rope 5. While the traction rope 5 bends along with the curved groove 331, the groove wall of the curved groove 331 can restrict the traction rope 5 and keep the traction rope 5 in close contact with the groove bottom 333, thereby reducing the possibility of the traction rope 5 slipping with the curved groove 331. When A > 20°, the inclination angle of the two groove walls is relatively gentle, which will reduce the contact area between the traction rope 5 and the groove wall, reduce the friction force between the curved groove 331 and the traction rope 5, and thus reduce the load-bearing capacity of the traction rope 5. Additionally, when the traction rope 5 is bent under the action of the curved groove 331, when the inclination angle of the groove wall is relatively gentle, the traction rope 5 may break away from the groove bottom 333 and slide onto the groove wall of the curved groove 331, further reducing the contact area between the traction rope 5 and the curved groove 331, and may also cause the traction rope 5 to slip with the curved groove 331, posing a greater safety hazard. When A < 15°, the two groove walls of the curved groove 331 are close to perpendicular to the axial direction of the drum, which will reduce the groove opening width of the curved groove 331. When the traction rope 5 enters or exits the curved groove 331, the groove wall of the curved groove 331 is likely to obstruct the traction rope 5, causing the traction rope 5 to generate a greater bending angle and resulting in the traction rope 5 being prone to skipping.

[0044] As Figure 5 shown in the figure, in this embodiment, the included angle between the two groove walls of the straight groove 332 is the groove surface expansion angle B, and 30° ≤ B ≤ 40°. The groove surface expansion angle of the straight groove 332 is larger than that of the curved groove 331, so that the groove opening width of the straight groove 332 is relatively larger than that of the curved groove 331, thereby enabling the traction rope 5 to stably transition into the straight groove 332. Whether the traction rope 5 transitions from the straight groove 332 to the curved groove 331 or from the curved groove 331 to the straight groove 332, increasing the groove opening of the straight groove 332 can provide a larger avoidance space for the traction rope 5, enabling the traction rope 5 to stably enter or exit the curved groove 331 and making the passing of the traction rope 5 through the groove smoother. At the same time, after increasing the groove surface expansion angle of the straight groove 332, the groove surface expansion angle of the curved groove 331 can be maintained within a smaller range to facilitate increasing the friction force between the curved groove 331 and the traction rope 5. Additionally, since the traction rope 5 will not be bent by the groove wall in the straight groove 332 and the traction rope 5 is not prone to axial displacement in the straight groove 332, increasing the groove surface expansion angle of the straight groove 332 has a relatively small impact on the traction rope 5.

[0045] Embodiment 2:

[0046] As Figure 7 shown, the main difference between this embodiment and the first embodiment is that in this embodiment, the notches of the rope grooves 33 in the first drum 31 are staggered from the notches of the rope grooves 33 in the second drum 32. During the winding process of the traction rope 5, the traction rope 5 extends from the inlet part and the outlet part of one rope groove 33 to two adjacent rope grooves 33 of the other drum respectively, and the notches of the rope grooves 33 of one drum are staggered from the notches of the rope grooves 33 of the other drum, that is, the rope grooves 33 of one drum are located between two adjacent rope grooves 33 of the other drum. When the traction rope 5 enters the rope groove 33 at the inlet part or leaves the rope groove 33 at the outlet part, the maximum bending angle of the traction rope 5 between the two drums can be reduced, and thus the traction rope 5 can pass through the groove more smoothly, reducing the possibility of the traction rope 5 skipping the groove.

[0047] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. An electric hoist with a traction rope of unlimited rope length and multiple curved grooves, comprising a housing, a pressure wheel assembly, two rollers mounted on the housing, and a driving mechanism driving the two rollers, the two rollers are connected in a transmission manner to realize synchronous rotation, the rollers are provided with a plurality of rope grooves for winding the traction rope, the pressure wheel assembly acts on the traction rope to keep the traction rope taut, one end of the traction rope is a traction end for hanging a heavy object, and the other end is a free end, characterized in that: The rope grooves are arranged around the circumference of the drum, and the multiple turns of rope grooves are arranged along the axial direction of the drum. The multiple turns of rope grooves in at least one drum include a plurality of straight grooves and at least two curved grooves. During the winding process of the traction rope, the rope groove before the traction rope enters the curved groove is a straight groove, and the rope groove into which the traction rope enters after leaving the curved groove is a straight groove, and there is at least one straight groove between two adjacent curved grooves in the same drum.

2. The electric hoist with unlimited rope length and multiple curved grooves according to claim 1, characterized in that: The number of rope grooves in both drums is equal and the notches of the rope grooves in one drum are kept aligned with the notches of the rope grooves in the other drum.

3. The electric hoist with unlimited rope length and multiple curved grooves according to claim 1, characterized in that: The number of rope grooves in the two drums is equal, and the notches of the rope grooves in one drum are staggered with the notches of the rope grooves in the other drum.

4. The electric hoist with unlimited rope length and multiple curved grooves according to claim 1, characterized in that: One of the rollers is provided with two curved grooves, and a straight groove is provided between the two curved grooves.

5. The electric hoist with unlimited rope length and multiple curved grooves according to claim 1, characterized in that: The depth of the rope groove is h, the diameter of the traction rope is d, and 1.3d≤h≤1.7d.

6. The electric hoist with unlimited rope length and multiple curved grooves according to claim 1, characterized in that: The bottom of the rope groove is in an arc shape, the diameter of the bottom of the groove is L, the diameter of the traction rope is d, and L=d.

7. The electric hoist with unlimited rope length and multiple curved grooves according to claim 1, characterized in that: The angle between the two groove walls of the curved groove is the groove surface development angle A, and 15°≤A≤20°.

8. The electric hoist with unlimited rope length and multiple curved grooves according to claim 1, characterized in that: The angle between the two groove walls of the straight groove is the groove surface development angle B, and 30°≤B≤40°.

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