Traction machine and elevator

Abstract

The utility model relates to an elevator system, in particular to a traction machine and an elevator. The traction machine comprises a motor and a rotating shaft. The rotating shaft is connected to the motor and is driven by the motor to controllably rotate in the axial direction. A plurality of annular grooves surrounding the rotating shaft are formed in the surface of the rotating shaft, the steel belt bypasses the rotating shaft and covers the annular grooves at the same time, and the side face, making contact with the rotating shaft, of the steel belt is a plane and moves along with rotation of the rotating shaft. The steel belt is tightly attached to the rotating shaft through the annular groove, elevator stability reduction caused by slipping of the steel belt is prevented, the service life is prolonged, and noise is reduced.

Description

Technical Field

[0001] The utility model relates to an elevator system, in particular to a traction machine and an elevator. Background Art

[0002] A traction machine is a power device of an elevator, also known as an elevator main engine, which is used to transmit and transfer power to make the elevator operate. Currently, common traction machines usually drive the elevator car to lift and lower by driving a steel wire rope to move. However, the steel wire rope has poor elasticity, resulting in easy vibration of the elevator car during operation.

[0003] To improve the smoothness of elevator operation, the steel wire rope can be replaced with a steel belt, so that the traction machine drives the steel belt to move, and then realizes the lifting and lowering of the car. However, the steel belt is relatively soft and prone to sliding during movement, resulting in a decrease in the smoothness of the car. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a traction machine and an elevator in which the steel belt is not prone to sliding.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A traction machine includes a motor and a rotating shaft. The rotating shaft can be controllably rotated along its axial direction under the drive of the motor, and is used to drive the steel belt to move controllably along its outer wall. A plurality of annular grooves surrounding the rotating shaft are provided on the surface of the rotating shaft. The side surface of the steel belt in contact with the rotating shaft is a plane, and the steel belt covers a plurality of the annular grooves.

[0007] Optionally, the part of the rotating shaft corresponding to the steel belt is a limiting area, and the limiting area is configured into a middle-convex structure.

[0008] Optionally, the width of the limiting area is any value in the range of 40 mm to 60 mm, and the radius of curvature of the projection of the outer wall of the limiting area on a plane parallel to the axial direction is any value in the range of 350 mm to 500 mm.

[0009] Optionally, a plurality of limiting areas are provided on the surface of the rotating shaft, each limiting area corresponds to a steel belt respectively, and annular vertical surfaces are provided at both ends of the limiting area. The dividing channel protrudes relative to the limiting area.

[0010] Optionally, the annular grooves are uniformly arranged, and the ratio of the distance between adjacent annular grooves to the width of the annular grooves is any value in the range of 1.8 to 3.

[0011] Optionally, any steel belt covers at least 5 annular grooves.

[0012] Optionally, an anti-slip coating is provided on the surface of the rotating shaft.

[0013] Optionally, the cross-section of the annular groove is semi-circular.

[0014] Optionally, the traction machine further includes a brake, and the brake is arranged at one end of the rotating shaft away from the traction machine.

[0015] In a second aspect, the present utility model further provides an elevator, including the above-mentioned traction machine, steel belt, car and counterweight. The steel belt is supported on the rotating shaft of the traction machine, and both ends are respectively connected to the car and the counterweight. The rotating shaft rotates controllably to drive the steel belt to move controllably, so that the car moves controllably in the vertical direction.

[0016] According to the first aspect of the present utility model, since an annular groove corresponding to the steel belt is provided on the outer wall of the rotating shaft, when the steel belt contacts the outer wall of the rotating shaft, there is still a gap between the steel belt and the rotating shaft, thereby preventing the air between the steel belt and the rotating shaft from being unable to be discharged, forming an air cushion that isolates the steel belt and the rotating shaft, and ensuring the adhesion between the steel belt and the rotating shaft. By suppressing the generation of the air cushion, the instantaneous sharp drop of the local friction force is prevented, thereby preventing the local part of the steel belt from sliding axially relative to the rotating shaft, and preventing the generation of noise caused by the slipping and resetting of the steel belt.

[0017] According to the second aspect of the present utility model, by preventing the steel belt from axially shifting on the rotating shaft of the traction machine, it helps to improve the stability of the car of the elevator and reduce the generation of noise.

[0018] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly and implement it in accordance with the content of the specification, the following takes the preferred embodiments of the present utility model and combines with the drawings to describe in detail as follows. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the traction machine shown in the first embodiment of the present utility model;

[0020] Figure 2 It is a schematic structural diagram of the rotating shaft shown in the first embodiment of the present utility model;

[0021] Figure 3 is Figure 2 the enlarged view of A in

[0022] Legend: 1 - machine base, 11 - protective cover, 2 - motor, 21 - housing, 22 - stator, 23 - rotor, 3 - rotating shaft, 31 - limiting area, 311 - separating channel, 312 - annular groove, 313 - contact surface, 4 - brake. Detailed Embodiments

[0023] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0024] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying 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 understood as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. 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 situations.

[0026] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] Please refer to Figure 1 , the traction machine protected by the present utility model application includes a motor 2 and a rotating shaft 3. The rotating shaft 3 is connected to the motor 2 and is controllably rotated along the axial direction under the drive of the motor 2. A plurality of annular grooves 312 surrounding the rotating shaft 3 are provided on the surface of the rotating shaft 3. The steel belt bypasses the rotating shaft 3 and simultaneously covers a plurality of annular grooves 312. The side surface of the steel belt in contact with the rotating shaft 3 is a plane and undergoes displacement as the rotating shaft 3 rotates.

[0028] Since annular grooves 312 corresponding to the steel belt are provided on the outer wall of the rotating shaft 3, when the steel belt contacts the outer wall of the rotating shaft 3, there is still a gap between the steel belt and the rotating shaft 3, thereby preventing the air between the steel belt and the rotating shaft 3 from being unable to be discharged, forming an air cushion that isolates the steel belt from the rotating shaft 3, and ensuring the adhesion between the steel belt and the rotating shaft 3. By suppressing the generation of the air cushion, the instantaneous sharp drop of the local friction force is prevented, thereby preventing the local part of the steel belt from sliding axially relative to the rotating shaft 3, improving the safety and operation efficiency, reducing the wear of the contact surface, and preventing the generation of noise caused by the slippage and reset of the steel belt.

[0029] In some embodiments, the portion of the rotating shaft 3 corresponding to the steel belt is a limiting area 31, which is configured as a convex structure, which can increase the contact area between the two and evenly distribute the pressure on the contact surface, so that the force on the steel belt is uniform and stable. In addition, when the convex rotating shaft 3 contacts the steel belt, due to the geometric shape of the contact surface, the steel belt will be naturally guided to the center of the limiting area 31. This self-centering effect helps to ensure that the steel belt always runs in the correct position.

[0030] In some embodiments, the width of the limiting area 31 is any value between 40 mm and 60 mm, for example, any value between 40 mm, 45 mm, 50 mm, 55 mm and 60 mm. The radius of curvature of the projection of the outer wall of the limiting area 31 on a plane parallel to the axial direction is any value between 350 mm and 500 mm, for example, any value between 350 mm, 400 mm, 450 mm and 500 mm. By limiting the width of the limiting area 31 and the degree of protrusion of its outer wall, it is helpful to improve the fit between the outer wall of the limiting area 31 and the surface of the steel strip, and prevent the two edges on both sides of the axial direction from being difficult to fit.

[0031] In some embodiments, a plurality of limiting areas 31 are provided on the surface of the rotating shaft 3, each limiting area 31 corresponds to a steel belt, and an annular dividing lane 311 is provided at both ends of the limiting area 31. The dividing lane 311 is raised relative to the limiting area 31, and the steel belt is limited between two dividing lanes 311 whose intervals are matched with the width of the steel belt, which helps to suppress the deviation of the steel belt.

[0032] In some embodiments, the ratio of the distance between adjacent annular grooves 312 to the width of the annular grooves 312 is any value between 1.8 and 3, for example, it can be any value between 1.8, 2, 2.2, 2.4, 2.6, 2.8 and 3, to prevent the annular grooves 312 from being too large or too dense, resulting in too small a contact area between the steel belt and the limiting portion and insufficient friction.

[0033] In some embodiments, any one steel strip covers at least five annular grooves 312 , for example, the number of the annular grooves 312 may be any value among 5, 8, 11, 14, 17 and 20.

[0034] In some embodiments, the surface of the rotating shaft 3 is provided with an anti-skid coating to help increase friction and prevent the steel belt from slipping.

[0035] In some embodiments, the cross-section of the annular groove 312 is semicircular, which is easy to construct.

[0036] In some embodiments, the traction machine further includes a brake 4, which is disposed at one end of the rotating shaft 3 away from the traction machine, and helps to control the operation and stop of the elevator and improve the stability and safety of the elevator.

[0037] The present utility model also claims protection for an elevator, which includes the above-mentioned traction machine, steel belt, car and counterweight. The steel belt is supported on the rotating shaft 3 of the traction machine, and the two ends are respectively connected to the car and the counterweight. The rotating shaft 3 rotates controllably to drive the steel belt to move controllably, so that the car moves controllably in the vertical direction.

[0038] By preventing the steel belt from axially shifting on the rotating shaft 3 of the traction machine, it helps to improve the stability of the car of the elevator and reduce the generation of noise.

[0039] For details, please refer to the following embodiments.

[0040] Embodiment 1:

[0041] Please refer to Figure 1 , the elevator shown in a preferred embodiment of the present application includes a traction machine, a steel belt, a car and a counterweight arranged in an elevator shaft. The traction machine in this embodiment is used to drive the steel belt with both sides being flat to move controllably, so that the car and the counterweight move in opposite directions in the vertical direction. The traction machine has a rotating shaft 3 arranged horizontally and rotating along its axial direction. The middle part of the steel belt is supported on the rotating shaft 3 of the traction machine, and the two ends hang vertically and are respectively connected to the car and the counterweight. The steel belt moves as the rotating shaft 3 rotates, so that the car moves controllably in the vertical direction.

[0042] The traction machine includes a machine base 1, a motor 2, a rotating shaft 3 and a brake 4. The machine base 1 is fixedly connected to the top of the elevator shaft and is used to support the rotating shaft 3. The rotating shaft 3 passes horizontally through the machine base 1, and two identical deep groove ball bearings are respectively arranged at the positions where the rotating shaft 3 passes through both ends of the machine base 1, so as to ensure that the rotating shaft 3 can smoothly rotate along its axial direction relative to the machine base 1 and improve the bearing capacity of the rotating shaft 3 in the vertical direction. The motor 2 is fixedly connected to the base and the elevator shaft and includes a housing 21, a stator 22 and a rotor 23. The housing 21 of the motor 2 is made of aluminum alloy material, which helps to reduce the weight. The stator 22 of the motor 2 is an annular permanent magnet, which is arranged inside the housing 21 and fixedly connected to the inner wall of the housing 21 to form a stationary main magnetic pole. The rotor 23 of the motor 2 is an annular armature core, which is sleeved inside the stator 22 and generates an induced electromotive force after being energized, acting as a rotating magnetic field. Driven by the interaction force between the rotating magnetic field and the main magnetic pole, the rotor 23 rotates controllably. One end of the rotating shaft 3 is fixedly connected to the rotor 23 and is coaxial with the rotor 23, so as to rotate controllably under the action of the motor 2. The brake 4 is also connected to the base and the elevator shaft and is connected to the end of the rotating shaft 3 away from the motor 2, so that the rotating shaft 3 stops rotating smoothly.

[0043] Please refer to Figure 1 and Figure 2, five annular dividing channels 311 that protrude from the rotating shaft 3 are successively arranged on the rotating shaft 3. The direction of the dividing channels 311 is the vertical direction, and the area between two adjacent dividing channels on the rotating shaft 3 is a limiting area 31. In this embodiment, four limiting areas 31 with the same structure are formed, and the width of the middle third dividing channel is larger, so that the four limiting areas 31 are symmetric in pairs and are respectively close to the inner walls at both ends of the machine base 1, and are respectively used to support and restrain four steel belts with the same structure.

[0044] Please refer to Figure 2 and Figure 3 , the limiting area 31 is configured as a convex structure in the middle. Taking the outer wall of the part of the limiting area 31 in contact with the steel belt as the contact surface 313, the projection of the contact surface 313 on the plane parallel to the rotating shaft 3 is arc-shaped, and the radius of curvature is 450.5 mm. The width of the limiting area 31 is 52 mm, and the maximum radius of the cross-section of the limiting area 31 in the vertical direction is 100 mm. The limiting area 31 is used to constrain the position of the steel belt in the axial direction. Being configured as a convex structure in the middle helps to increase the friction force by increasing the contact area and evenly disperse the pressure, and helps to ensure that the steel belt always runs in the correct position through the self-centering effect. The width of the limiting area 31 is matched with the width of the steel belt, and combining the width of the limiting area 31 to constrain the convexity of the contact surface 313, that is, the radius of curvature of its projection, helps to ensure that the steel belt fully contacts the contact surface 313 on the premise of being able to form a self-centering effect.

[0045] A plurality of annular grooves 312 parallel to the dividing channels 311 are evenly arranged in the limiting area 31. The annular grooves 312 are recessed into the limiting area 31 and divide the contact surface 313 into multiple spaced surfaces. The cross-section of the annular groove 312 in the vertical direction is semi-circular. In this embodiment, nine annular grooves 312 are arranged in one limiting area 31. The diameter of the annular groove 312 is 2 mm, the horizontal distance between two adjacent annular grooves 312 is 4 mm, and the horizontal distance between the two annular grooves 312 close to the dividing channel 311 and the dividing channel 311 is 1 mm. When the steel belt moves to the position where it contacts the contact surface 313, the air between the steel belt and the contact surface 313 is communicated with the atmosphere through the annular grooves 312, so as to ensure the close contact between the steel belt and the contact surface 313, prevent the formation of an air cushion in some areas between the steel belt and the contact surface 313, and further prevent the steel belt from slipping relative to the contact surface 313. By restricting the number of the annular grooves 312 and the ratio of the contact area between the steel belt and the annular grooves 312 and the contact surface 313, it is prevented that the area of the contact surface 313 is too small, resulting in too small friction force between the contact surface 313 and the steel belt.

[0046] In this embodiment, an anti-slip coating is provided on the surface of the contact surface 313 of the rotating shaft 3, which also helps to prevent the steel belt from slipping.

[0047] In this embodiment, a protective cover 11 is also fixedly arranged on the machine base 1 to protect the steel belt from the side.

[0048] The beneficial effects of the present utility model are as follows: By improving and optimizing the structure of the rotating shaft 3 of the traction machine, it is possible to prevent the steel belt from slipping relative to the rotating shaft 3, so that the steel belt can be displaced smoothly, improving the stability of the elevator car during operation, and helping to reduce the operating noise and extend the service life.

[0049] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0050] The above-described embodiments only express several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A traction machine, characterized in that, It includes a motor (2) and a rotating shaft (3). The rotating shaft (3) is controllably rotated along its axial direction under the drive of the motor (2) and is used to drive the steel belt to controllably move along its outer wall. A plurality of annular grooves (312) surrounding the rotating shaft (3) are provided on the surface of the rotating shaft (3). The side surface of the steel belt in contact with the rotating shaft (3) is a plane, and the steel belt covers a plurality of the annular grooves (312).

2. The traction machine according to claim 1, characterized in that, The part of the rotating shaft (3) corresponding to the steel belt is a limiting area (31), and the limiting area (31) is configured into a convex structure in the middle.

3. The traction machine according to claim 2, wherein, The width of the limiting area (31) is any value in the range of 40 mm to 60 mm, and the radius of curvature of the projection of the outer wall of the limiting area (31) on a plane parallel to the axial direction is any value in the range of 350 mm to 500 mm.

4. The traction machine according to claim 1, characterized in that, A plurality of limiting areas (31) are provided on the surface of the rotating shaft (3). Each of the limiting areas (31) corresponds to one steel belt respectively, and annular separating channels (311) are provided at both ends of the limiting area (31). The separating channels (311) protrude relative to the limiting area (31).

5. The traction machine according to claim 1, wherein, The ratio of the distance between adjacent annular grooves (312) to the width of the annular grooves (312) is any value in the range of 1.8 to 3.

6. The traction machine according to claim 2, characterized in that, Any one of the steel belts covers at least 5 of the annular grooves (312).

7. The traction machine according to claim 1, characterized in that, An anti-slip coating is provided on the surface of the rotating shaft (3).

8. The traction machine according to claim 1, characterized in that, The annular grooves (312) are uniformly arranged, and the cross-section of the annular grooves (312) is semi-circular.

9. The traction machine according to claim 1, characterized in that, It further includes a brake (4), and the brake (4) is arranged at one end of the rotating shaft (3) away from the traction machine.

10. An elevator, characterized in that, It includes a traction machine, a steel belt, a car and a counterweight as described in any one of claims 1 to 9. The steel belt is supported on the rotating shaft (3) of the traction machine, and the two ends are respectively connected to the car and the counterweight. The rotating shaft (3) rotates controllably to drive the steel belt to move controllably, so that the car moves controllably in the vertical direction.

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