Traction rope electric hoist without limiting rope length
The electric hoist design with pressure wheels addressing rope slippage issues in high-altitude operations ensures stable rope tension and load capacity, enhancing safety and efficiency.
Patent Information
- Application Number
- CN202422235881.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-12
AI Technical Summary
When existing electric hoists are operating at high altitudes, the traction rope is prone to scrambling and slipping, which poses safety hazards.
The pressing wheel assembly is adopted, including a plurality of rotatable pressing wheels, which are directly embedded in the rope groove and press the traction rope to form static friction to ensure that the traction rope rotates synchronously with the drum to avoid slippage.
It improves the load capacity and use safety of the traction rope, reduces the possibility of the traction rope and the drum slipping, and ensures the stable operation of the electric hoist.
Smart Images
Figure CN223102605U_ABST
Abstract
Description
Technical Field
[0001] The utility model discloses a traction rope electric hoist with unlimited rope length, belonging to the technical field of electric hoists. Background Art
[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 traction rope on the one hand and to wind the traction 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 enlarged to increase the length of the traction rope. However, the longer the traction rope is during high-altitude operation, the more layers it winds on the rope storage roller. At this time, the traction rope is more likely to be disordered, and at the same time, it will increase the burden on the motor.
[0003] In order to break away from the length limitation of the traction rope, there are traction devices 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 winds according to the rotation direction of the rope groove pulley and the spiral pulley, and then passes out from the outlet of the machine shell. 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 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 tension state to achieve the purpose of towing heavy objects.
[0004] However, the length of the outlet rope pressing wheel described in the above patent is similar to the length of the rope groove pulley, and the outlet rope pressing wheel only presses on the surface of the rope groove pulley. When the diameter of the traction rope is smaller than the depth of the rope groove, the outlet rope pressing wheel will not contact the traction rope. Therefore, the traction rope may shake, and there is a possibility of slipping between the traction rope and the sheave mechanism, which may affect the normal operation of the traction rope and pose a safety hazard. Summary of the Utility Model
[0005] The purpose of the utility model is to solve the problem that the traction rope may slip, resulting in potential safety hazards of the electric hoist. Therefore, a traction rope electric hoist with unlimited rope length is provided, which can effectively reduce the possibility of the traction rope slipping.
[0006] To solve the above technical problems, the utility model adopts the following technical solutions:
[0007] A traction rope electric hoist with unlimited rope length includes a casing, a pressure wheel assembly, two rollers installed on the casing and a driving mechanism that drives the two rollers. The two rollers are connected in transmission to achieve synchronous rotation. The rollers are provided with multiple 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. The pressure wheel assembly includes a plurality of rotatable pressure wheels, which enter the rope groove and press the traction rope to form static friction between the traction rope and the roller.
[0008] The beneficial effects of adopting the utility model are:
[0009] The pressure wheel assembly described in the utility model includes a plurality of pressure wheels, which are directly embedded in the rope groove and squeeze the traction rope to keep static friction between the traction rope and the rope groove, so that the traction rope is kept in a tensioned state, thereby ensuring that the traction rope and the drum keep rotating synchronously, avoiding the possibility of slipping between the traction rope and the drum, and enabling the traction rope to stably lift or lower heavy objects, which helps to improve the safety of the electric hoist; in addition, the pressure wheel assembly includes a plurality of pressure wheels, and the plurality of pressure wheels act on the traction ropes in the plurality of rope grooves, so that the traction rope can maintain stable static friction with the rope groove, which can effectively improve the load capacity of the traction rope, and also can reduce the possibility of slipping between the traction rope and the rope groove.
[0010] Preferably, the rope groove includes a straight groove and a curved groove, the straight groove is arranged on the outer side of the drum along the circumference of the drum, the curved groove includes two annular walls in a wavy curve, and the pressure wheel is embedded in the straight groove. After the traction rope enters the curved groove using the above technical solution, the traction rope will bend along the wall of the curved groove, and the contact pressure between the traction rope and the wall of the rope groove will be increased by using the tension of the traction rope itself, while increasing the contact area between the traction rope and the wall of the curved groove, which helps to increase the friction between the traction rope and the curved groove, thereby significantly improving the load capacity of the traction rope.
[0011] Preferably, the pressure wheel assembly also includes a reset device and a rotating shaft, and the reset device acts on the rotating shaft so that the rotating shaft has a movement tendency to move toward the rope groove. With the above-mentioned technical solution, the reset device can keep the pressure wheel in stable contact with the traction rope, and at the same time can increase the pressure of the pressure wheel on the traction rope, which can effectively reduce the possibility of slipping between the traction rope and the rope groove; in addition, the reset device can flexibly adapt the spacing between the pressure wheel and the rope groove. When replacing traction ropes of different diameters, the reset device can make the pressure wheel automatically adapt to the diameter of the traction rope and keep stable contact with the traction rope, without adjusting the position of the rotating shaft, which can improve the replacement efficiency of the traction rope and also improve the safety of the electric hoist.
[0012] Preferably, the resetting device comprises a tension spring, and two ends of the tension spring are respectively connected to the rotating shaft and the casing.
[0013] Preferably, the housing is provided with a mounting hole, the end of the rotating shaft is slidably connected to the mounting hole, and the reset member acts on the rotating shaft so that the rotating shaft has a tendency to move along the mounting hole. With the above technical solution, the mounting hole can allow the rotating shaft to approach or move away from the rope groove, so that the position of the rotating shaft can be adjusted, thereby making the pressure wheel adapt to traction ropes of different diameters, which helps to improve the application range of the pressure wheel assembly.
[0014] Preferably, the part of the rope groove where the traction rope enters the rope groove is the line entry part, and the part where the traction rope leaves the rope groove is the line exit part, and the traction rope is pressed by the pressure wheel at the line entry part and / or the line exit part. With the above technical solution, the line entry part is the part where the traction rope enters the rope groove, and the line exit part is the part where the traction rope leaves the rope groove. At this time, the contact between the traction rope and the rope groove is relatively unstable. The pressure wheel squeezes the traction rope so that the traction rope can be kept in close contact with the rope groove as soon as it enters the rope groove, thereby increasing the tension of the traction rope and further reducing the possibility of the traction rope slipping; in addition, the pressure wheel can also guide the traction rope, and can guide the traction rope to enter or leave the rope groove, so that the traction rope is wound between the drums to remain stable and reliable.
[0015] Preferably, the roller includes a first roller and a second roller, the driving mechanism is connected to the first roller by transmission, at least one pressure wheel assembly is provided in the housing, and at least one pressure wheel assembly is located on one side of the first roller. With the above technical solution, since the driving mechanism is connected to the first roller by transmission, the driving mechanism drives the first roller to rotate, so it is more likely that the traction rope will slip at the first roller. Therefore, the pressure wheel assembly is placed on one side of the first roller so that the pressure wheel can strengthen the tightness between the traction rope and the first roller, thereby effectively reducing the possibility of slipping between the first roller and the traction rope, so that the electric hoist can lift or lower heavy objects stably, thereby improving the safety of the electric hoist.
[0016] Preferably, two pressing wheel assemblies are provided in the casing, and the two pressing wheel assemblies are respectively located on one side of the first roller and one side of the second roller.
[0017] Preferably, the two pressing wheel assemblies are located on the same side of the first roller and the second roller; or, the two pressing wheel assemblies are located on both sides of the first roller and the second roller, respectively.
[0018] Preferably, the roller comprises a first roller and a second roller, the first roller is fixedly mounted with a first gear, the second roller is fixedly mounted with a second gear, the first gear and the second gear are meshed with each other to achieve synchronous reverse rotation of the first roller and the second roller; or, a transmission gear is rotatably connected to the casing, the transmission gear is meshed with the first gear and the second gear at the same time, so that the first roller and the second roller rotate synchronously in the same direction.
[0019] Other features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and the accompanying drawings. Description of the Drawings
[0020] The following further describes the present utility model with reference to the accompanying drawings:
[0021] Figure 1 It is a schematic structural diagram of a traction rope electric hoist with unlimited rope length according to the present utility model;
[0022] Figure 2 It is a schematic internal structure diagram of a traction rope electric hoist with unlimited rope length according to the present utility model;
[0023] Figure 3 It is a sectional view of a traction rope electric hoist with unlimited rope length according to the present utility model;
[0024] Figure 4 It is a top view of a traction rope electric hoist with unlimited rope length according to the present utility model;
[0025] Figure 5 It is a schematic internal structure diagram of the electric hoist in the second embodiment of the present utility model;
[0026] Figure 6 It is a schematic internal structure of the electric hoist in the third embodiment of the present utility model Figure 1 ;
[0027] Figure 7 It is a schematic internal structure of the electric hoist in the third embodiment of the present utility model Figure 2 。
[0028] Reference numerals: 1, housing; 11, first through hole; 12, second through hole; 13, mounting hole; 2, driving mechanism; 21, reduction box; 3, drum; 31, first drum; 311, first transmission shaft; 312, first gear; 32, second drum; 321, second transmission shaft; 322, second gear; 33, rope groove; 331, straight groove; 332, curved groove; 34, transmission gear; 4, pressure wheel assembly; 41, rotating shaft; 42, pressure wheel; 421, bearing; 43, tension spring; 5, traction rope; 51, traction end; 52, free end. Detailed Description of the Embodiments
[0029] The following explains and illustrates the technical solutions of the embodiments of the present utility model 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 embodiments, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.
[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly defined.
[0032] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0033] Embodiment 1:
[0034] like Figures 1 to 4 As shown, this embodiment shows an electric hoist with a traction rope of unlimited rope length, including a casing 1, a pressure wheel assembly 4, two rollers 3 installed on the casing 1 and a driving mechanism 2 for driving the two rollers 3, the two rollers 3 are connected in transmission to achieve synchronous rotation, and the rollers 3 are provided with a multi-circle rope groove 33 for winding the traction rope 5. 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 pressure wheel assembly 4 includes a plurality of rotatable pressure wheels 42, the pressure wheels 42 enter the rope groove 33 and press the traction rope 5, so that the traction rope 5 and the roller 3 form static friction.
[0035] In this embodiment, the pressing wheel assembly 4 includes a plurality of pressing wheels 42. The pressing wheels 42 are directly embedded in the rope grooves 33 and squeeze the towing rope 5, so that the towing rope 5 maintains a static friction with the rope grooves 33, enabling the towing rope 5 to be in a tensioned state, thereby ensuring that the towing rope 5 rotates synchronously with the drum 3, avoiding the possibility of slippage between the towing rope 5 and the drum 3, enabling the towing rope 5 to stably lift or lower heavy objects, and contributing to improving the safety of use of the electric hoist. Additionally, the pressing wheel assembly 4 includes a plurality of pressing wheels 42. By the action of the plurality of pressing wheels 42 on the towing rope 5 in the plurality of rope grooves 33, the towing rope 5 can maintain a stable static friction with the rope grooves 33, effectively improving the load capacity of the towing rope 5 and also reducing the possibility of slippage between the towing rope 5 and the rope grooves 33.
[0036] As Figure 1 and Figure 2 shown, in this embodiment, the two drums 3 in the housing 1 are respectively a first drum 31 and a second drum 32. A first transmission shaft 311 passes through the first drum 31. The first transmission shaft 311 and the first drum 31 achieve synchronous rotation through splines. The output end of the driving mechanism 2 is in transmission connection with the first transmission shaft 311, thereby driving the first transmission shaft 311 to rotate. One end of the first transmission shaft 311 away from the driving mechanism 2 is rotatably connected to the housing 1. A first gear 312 is sleeved on the end of the first transmission shaft 311 away from the driving mechanism 2. The first gear 312 rotates synchronously with the first transmission shaft 311. A second transmission shaft 321 passes through the second drum 32. The second transmission shaft 321 and the second drum 32 achieve synchronous rotation through splines. Both ends of the second transmission shaft 321 are rotatably connected to the housing 1. A second gear 322 is provided at the same end of the second transmission shaft 321 and the first transmission shaft 312, that is, a second gear 322 is sleeved on the end of the second transmission shaft 321 away from the driving mechanism 2. The second gear 322 rotates synchronously with the second transmission shaft 321. A transmission gear 34 is provided between the first gear 312 and the second gear 322. The transmission gear 34 is rotatably arranged on the housing 1. The transmission gear 34 is simultaneously meshed with the first gear 312 and the second gear 322. The driving mechanism 2 drives the first transmission shaft 311 to rotate. The first gear 312 rotates with the first transmission shaft 311 and drives the second gear 322 to rotate through the transmission gear 34. The second gear 322 drives the rotation of the second transmission shaft 321, thereby realizing the synchronous and co-rotational rotation of the first drum 31 and the second drum 32.
[0037] 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 driving 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 traction rope 5 is wound in an "8" shape in the first drum 31 and the second drum 32. This winding method can increase the contact area between the traction rope 5 and the rope groove 33, thereby increasing the friction between the traction rope 5 and the rope groove 33 and enabling the traction rope 5 to have a greater load-bearing capacity.
[0038] In addition, in the height direction of this embodiment, the second transmission shaft 321 of the second drum 32 is lower than the first transmission shaft 311 of the first drum 31. The machine housing 1 is provided with a first through hole 11 and a second through hole 12. The first through hole 11 is located below the second drum 32, and the second through hole 12 is located below the first drum 31. The traction end 51 of the traction rope 5 passes through the lower end of the first through hole 11 for fixing a heavy object. When the electric hoist lifts the heavy object, the traction rope 5 enters the rope groove 33 of the second drum 32 after passing through the first through hole 11, winds around the first drum 31 after passing through the second drum 32 and enters the rope groove 33 of the first drum 31, and then returns to the rope groove 33 of the second drum 32 after passing over the upper side of the first drum 31. After repeated winding, the free end 52 of the traction rope 5 disengages from the rope groove 33 of the first drum 31 and exits the machine housing 1 along the second through hole 12 of the machine housing 1; when the electric hoist lowers the heavy object, the traction rope 5 moves in the reverse direction, that is, the traction end 51 of the traction rope 5 enters the machine housing 1 from the second through hole 12 and enters the rope groove 33 of the first drum 31, then disengages from the first drum 31 and enters the rope groove 33 of the second drum 32. After the traction rope 5 is wound between the first drum 31 and the second drum 32 multiple times, the free end 52 of the traction rope 5 exits the machine housing 1 through the first through hole 11 after disengaging from the second drum 32.
[0039] Such as Figure 4As shown, in this embodiment, the rope groove 33 is arranged around the circumference of the drum. Multiple turns of rope grooves 33 are arranged around the drum, and the multiple turns of rope grooves 33 are arranged along the axial direction of the drum. Among them, the rope grooves 33 in the first drum 31 include straight grooves 332 and curved grooves 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. There are two curved grooves 331 in the first drum 31, and there is one straight groove 332 between the two curved grooves 331. Only straight grooves 332 are provided in the second drum 32. In addition, in this embodiment, the number of pressure wheels 42 in the pressure wheel assembly 4 is equal to the number of straight grooves 331 in the corresponding first drum 31 or second drum 32, that is, the pressure wheels 42 in the pressure wheel assembly 4 are only embedded into the straight grooves 331, as Figure 2 described, in this embodiment, there are two curved grooves 332 and four straight grooves 331 in the first drum 31 in total. There are four pressure wheels 42 in the pressure wheel assembly 4 on one side of the first drum 31, and the four pressure wheels 42 are all correspondingly embedded into the straight grooves 331. And all six rope grooves 33 in the second drum 32 are straight grooves 331, then there are six pressure wheels 42 in the pressure wheel assembly 4 on one side of the second drum 32, and the pressure wheels 42 are all correspondingly embedded into the straight grooves 331.
[0040] As Figure 3 shown, in this embodiment, during the winding process of the traction rope 5, the part where the traction rope 5 enters the rope groove 33 in the rope groove 33 is the inlet part, and the part where the traction rope 5 leaves the rope groove 33 is the outlet part. Each rope groove has an inlet part and an outlet part. Taking the first drum 31 as an example, after the traction rope 5 leaves the rope groove 33 of the second drum 32, it first reaches the inlet part of the rope groove 33 in the first drum 31. After passing through the inlet part, the traction rope 5 enters the rope groove 33 of the first drum 31. After the traction rope winds along the rope groove 33, the traction rope 5 leaves the rope groove 33 of the first drum 31 through the outlet part. When the traction rope 5 passes through the inlet part and the outlet part, the contact between the traction rope 5 and the rope groove 33 is relatively unstable. By the action of the pressure wheel 42 on the traction rope 5 at the inlet part or the outlet part, the traction rope 5 can be kept in close contact with the rope groove 33 as soon as it enters the rope groove 33, thereby increasing the tension of the traction rope 5 and further reducing the possibility of the traction rope 5 slipping; in addition, the pressure wheel 42 can also play a guiding role for the traction rope 5, and can guide the traction rope 5 to enter or leave the rope groove 33, so that the traction rope 5 is wound stably and reliably between the drums 33.
[0041] As Figure 1 and Figure 2As shown in the figure, in this embodiment, two pressing wheel assemblies 4 are provided inside the casing 1. The two pressing wheel assemblies 4 are distributed on one side of the first roller 31 and one side of the second roller 32. The pressing wheel assembly 4 includes a rotating shaft 41, a reset member, and a plurality of pressing wheels 42 rotatably arranged on the rotating shaft 41. An installation hole 13 for the rotating shaft 41 to pass through is provided on the casing 1. Both ends of the rotating shaft 41 pass through the installation hole 13, and the end of the rotating shaft 41 outside the casing 1 is threadedly matched with a nut to limit the connection between the rotating shaft 41 and the casing 1. In addition, the reset member is a tension spring 43. A connecting column is provided inside the casing 1. One end of the tension spring 43 hooks the rotating shaft 41, and the other end hooks the connecting column. The installation hole 13 is an oval hole. The reset member acts on the rotating shaft 41 so that the rotating shaft 41 has a tendency to move towards the rope groove 33. The installation hole 13 can allow the rotating shaft 41 to slide so that the rotating shaft 41 can move towards or away from the rope groove 33. The reset device can keep the pressing wheel 42 in stable contact with the traction rope 5, and at the same time can increase the pressure of the pressing wheel 42 on the traction rope 5, which can effectively reduce the possibility of the traction rope 5 slipping with the rope groove 33. In addition, the distance between the pressing wheel 42 and the rope groove 33 can be flexibly adapted through the reset device. When the diameter of the traction rope 5 becomes larger, the whole rotating shaft 41 moves towards the side away from the rope groove 33 when the traction rope 5 acts on the pressing wheel 42. At this time, the tension spring 43 is stretched, thereby increasing the elastic force of the tension spring 43, and further increasing the squeezing force of the pressing wheel 42 on the traction rope 5. When the diameter of the traction rope 5 becomes smaller, the rotating shaft 41 will penetrate deeper into the rope groove 33 under the action of the elastic force of the tension spring 43, so that the pressing wheel 42 remains in close contact with the traction rope 5. At the same time, under the action of the tension spring 43, the pressing wheel 42 can also have a squeezing force on the traction rope 5, improving the tightness between the traction rope 5 and the rope groove 33. In this embodiment, the reset device can automatically adapt the diameter of the pressing wheel 42 to the traction rope 5 and keep stable contact with the traction rope 5, without adjusting the position of the rotating shaft 41, which can improve the replacement efficiency of the traction rope 5 and also improve the use safety of the electric hoist.
[0042] As Figure 2 shown, in this embodiment, the two pressing wheel assemblies 4 are respectively on both sides of the first roller 31 and the second roller 32, that is, one pressing wheel assembly 4 is on the right side of the first roller 31, and the other pressing wheel assembly 4 is on the left side of the second roller 32. Of course, it can be understood that in other embodiments, one pressing wheel assembly 4 can also be on the left side of the first roller 31, and the other pressing wheel assembly 4 is correspondingly on the right side of the second roller 32.
[0043] Of course, it is understandable that in other embodiments, the number of the pressing wheel assemblies 4 in the casing 1 can also be three or four. When the number of the pressing wheel assemblies 4 is three, two of the pressing wheel assemblies 4 can be respectively arranged at the positions corresponding to the two tangent positions 35 of the first roller 31, and the other pressing wheel assembly 4 can be arranged on one side of the second roller 32; or, two of the pressing wheel assemblies 4 can be respectively arranged at the positions corresponding to the two tangent positions 35 of the second roller 32, and the other pressing wheel assembly 4 can be arranged on one side of the first roller 31; and when the number of the pressing wheel assemblies 4 is four, the pressing wheel assemblies 4 can be respectively arranged at the positions corresponding to the two tangent positions 35 of the first roller 31, and the other two pressing wheel assemblies 4 can be respectively arranged at the positions corresponding to the two tangent positions 35 of the second roller 32.
[0044] Embodiment 2:
[0045] like Figure 5 As shown, the main difference between this embodiment and the first embodiment is that, in this embodiment, the two pressing wheel assemblies 4 are on the same side of the first roller 31 and the second roller 32, that is, one of the pressing wheel assemblies 4 is on the left side of the first roller 31, and the other pressing wheel assembly 4 is also on the left side of the second roller 32. Of course, it can be understood that in other embodiments, one of the pressing wheel assemblies 4 can also be on the right side of the first roller 31, and the other pressing wheel assembly 4 is also on the right side of the second roller 32; when the two pressing wheel assemblies 4 are on the same side of the first roller 31 and the second roller 32, the overall structure of the casing 1 can be made more regular, which helps to reduce the difficulty of manufacturing the casing 1. It can also reduce the width of the casing 1, making the electric hoist more compact as a whole and suitable for working environments with narrow space.
[0046] Embodiment three:
[0047] like Figure 6 and Figure 7 As shown, the main difference between this embodiment and the first embodiment is that in this embodiment, only one pressure wheel assembly 4 is provided in the casing 1, and the pressure wheel assembly 4 is on one side of the first roller 31. The pressure wheel assembly 4 can be on the left side of the first roller 31 or on the right side of the first roller 31. The pressure wheel 42 of the pressure wheel assembly 4 acts on the traction rope 5 where the tangent point 35 of the first roller 31 is located. Since the driving mechanism 2 is connected to the first roller 31 by transmission, the driving mechanism 2 drives the first roller 31 to rotate. Therefore, the traction rope 5 is more likely to slip at the first roller 31. Therefore, the pressure wheel assembly 4 is placed on one side of the first roller 31, so that the pressure wheel 42 strengthens the tightness between the traction rope 5 and the first roller 31, thereby effectively reducing the possibility of slipping between the first roller 31 and the traction rope 5, so that the electric hoist can lift or lower heavy objects stably, thereby improving the safety of the electric hoist.
[0048] As described above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that the present utility model includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present utility model will be included in the scope of the claims.
Claims
1. An electric hoist with a traction rope of unlimited rope length, 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 pressing wheel assembly includes a plurality of rotatable pressing wheels. The pressing wheels enter the rope groove and press the traction rope tightly, so that the traction rope forms a static friction with the drum.
2. The electric hoist with a traction rope of unlimited length according to claim 1, characterized in that The rope groove includes a straight groove and a curved groove. The straight groove is arranged around the outer side of the drum along the circumferential direction of the drum. The curved groove includes two annular wall surfaces in a wavy curve, and the pressing wheels are embedded in the straight groove.
3. A wire rope electric hoist with an unlimited rope length according to claim 1, characterized in that, The pressing wheel assembly further includes a reset device and a rotating shaft. The reset device acts on the rotating shaft to make the rotating shaft have a movement tendency to move towards the rope groove.
4. The electric wire rope hoist with unlimited rope length according to claim 3, characterized in that, The reset device includes a tension spring, and the two ends of the tension spring are respectively connected to the rotating shaft and the machine shell.
5. The electric hoist with a traction rope of unlimited length according to claim 3, characterized in that, An installation hole is provided on the machine shell, and the end of the rotating shaft is slidably connected to the installation hole. The reset member acts on the rotating shaft to make the rotating shaft have a movement tendency to move along the installation hole.
6. The electric hoist with a traction rope of unlimited length according to claim 1, characterized in that In the rope groove, the part where the traction rope enters the rope groove is the incoming line part, and the part where the traction rope leaves the rope groove is the outgoing line part. The traction rope is pressed tightly by the pressing wheels at the incoming line part and / or the outgoing line part.
7. An electric hoist with a traction rope of unlimited length according to claim 1, wherein The drum includes a first drum and a second drum. The driving mechanism is in transmission connection with the first drum. At least one pressing wheel assembly is arranged in the machine shell, and at least one pressing wheel assembly is on one side of the first drum.
8. A traction rope electric hoist with an unlimited rope length according to claim 7, characterized in that, Two pressing wheel assemblies are arranged in the machine shell, and the two pressing wheel assemblies are respectively on one side of the first drum and one side of the second drum.
9. The electric hoist with a traction rope of unlimited length according to claim 1, characterized in that, Two pressing wheel assemblies are arranged in the machine shell, and the two pressing wheel assemblies are on the same side of the two drums; or the two pressing wheel assemblies are respectively on both sides of the two drums.
10. The electric hoist with a traction rope of unlimited length according to claim 1, characterized in that The drum includes a first drum and a second drum. A first gear is fixedly installed on the first drum, and a second gear is fixedly installed on the second drum. The first gear and the second gear are meshed with each other to realize the synchronous reverse rotation of the first drum and the second drum; or a transmission gear is rotatably connected to the machine shell, and the transmission gear is meshed with the first gear and the second gear at the same time to make the first drum and the second drum rotate synchronously in the same direction.