Traction machine for large freight elevator

Abstract

The utility model discloses a traction machine for a large freight elevator, which comprises a traction machine shell, a machine base welded and installed at the bottom of the traction machine shell, encoders welded and installed on two sides of the traction machine shell and a rope wheel installed at one end of the traction machine shell, and stator iron cores are fixedly installed at the top and the bottom in the traction machine shell. A permanent magnet rotor is rotatably installed on the inner wall of the traction machine shell between the stator iron cores, a plurality of stator windings are installed on the inner circle between the stator iron cores and the permanent magnet rotor in a winding mode, and the rope wheel and the traction machine shell are rotatably installed through a bearing connecting structure. Heat accumulated in the driving process of the rope wheel is reduced, so that the heat dissipation effect of the driving end of the rope wheel is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of traction machines, and in particular relates to a traction machine for a large freight elevator. Background Art

[0002] The elevator traction machine is the elevator's power source, also known as the main elevator unit. Its function is to transmit and transfer power to operate the elevator. It consists of a motor, brake, coupling, reduction gear, traction sheave, frame, guide pulley, and an attached turning handwheel. The guide pulley is typically mounted on the frame or on a load-bearing beam beneath it. The turning handwheel can be fixed to the motor shaft or hung on a nearby wall, then attached to the motor shaft when in use.

[0003] Domestic application number 202122959851.7 discloses a permanent magnet synchronous traction machine. The machine includes a base within which a main shaft is mounted. The main shaft is mounted on the base via a first tapered roller bearing and a second tapered roller bearing. The tapered roller bearings have a large head and a small head, with the small heads of the tapered roller bearings facing each other. A traction sheave is mounted on the main shaft. The base includes an annular stator and rotor, with the rotor encased within the stator and connected to the main shaft. The first tapered roller bearing is provided with a first oil seal at each end, both fabricated from sheet metal. The second tapered roller bearing has a skeleton oil seal at one end and a second oil seal at the other end, both fabricated from sheet metal. A rubber sealing plate is positioned between the second oil seal and the second tapered roller bearing, with a herringbone-shaped sealing foot at the end. This utility model boasts a long bearing life, a more stable and reliable structure, and excellent bearing sealing performance. Bearings with better sealing properties are easier to oil and maintain, but the sheave and bearings will generate a lot of heat during the high-speed driving process. If the heat is not easy to release, it will easily lead to friction fire or aggravate the aging of the sheave, which is not conducive to the continued use of the traction machine and is dangerous. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a traction machine for a large freight elevator, including a traction machine housing, a machine base welded to the bottom of the traction machine housing, an encoder welded to both sides of the traction machine housing, and a sheave installed at one end. Stator cores are fixedly installed at the top and bottom of the traction machine housing, a permanent magnet rotor is rotatably installed between the stator cores and on the inner wall of the traction machine housing, multiple groups of stator windings are wound around the inner circle between the stator core and the permanent magnet rotor, and the sheave and the traction machine housing are rotatably installed through a bearing connection structure.

[0005] When a permanent magnet synchronous traction machine starts, the controller supplies three-phase AC power to the stator windings. This current generates a rotating magnetic field through the stator windings. The controller also monitors the fixed magnetic field of the permanent magnet rotor and adjusts the current in the stator windings based on the operating status and load of the elevator or train. By adjusting the current magnitude and frequency, the controller ensures magnetic field matching that of the permanent magnet rotor.

[0006] As a further preferred technical solution of the present invention, a heat dissipation cavity is provided at one end of the traction machine housing, and an air-cooled radiator is installed inside the heat dissipation cavity.

[0007] The heat dissipation of the traction machine is carried out through the heat dissipation device inside the heat dissipation cavity.

[0008] As a further preferred technical solution of the present invention, a shock-absorbing pad is installed at the bottom of the base.

[0009] The shock-absorbing pad can effectively reduce the running noise and improve the running effect.

[0010] As a further preferred technical solution of the present invention; a winding groove is provided on the outer circle of the rope pulley, and a steel wire rope is wound on the winding groove, a brake wheel is installed at one end of the rope pulley, an output shaft is fixedly installed at one end of the permanent magnet rotor, a connecting block is extended to one end of the output shaft, and multiple groups of raised limit blocks are welded on the outer circle of the connecting block, a clamping block is extended to one end of the connecting block, and the rope pulley and the permanent magnet rotor are clamped and fixed by the connecting block and the clamping block.

[0011] The output shaft is fixedly connected to the rope pulley, which facilitates the driving of the rope pulley to rotate, thereby achieving the effect of driving and traction of the elevator.

[0012] As a further preferred technical solution of the present invention; the bearing connection structure includes a bearing seat welded and installed with the traction machine housing, a rotating block is rotatably installed on one side of the bearing seat, and the rotating block and the bearing seat are reinforced by an engaging ring.

[0013] The engagement ring is provided to ensure the stability of the rotation of the rotating block on the bearing seat, and the bearing connection structure connects the rope pulley and the traction machine housing to ensure the firm effect between the rope pulley and the traction machine housing when rotating, preventing the rope pulley from slipping and causing safety risks.

[0014] As a further preferred technical solution of the present invention; heat exhaust ports are provided on one end of the sheave, on both ends of the bearing connection structure and on one end of the traction machine housing; a heat conduction cavity is provided on the sheave at the position of the heat exhaust port; a heat conduction channel is provided on the sheave outside the heat exhaust port; the sheave and the rotating block are welded and installed through the welding block; a barrier ring is fixedly installed on the outside of the output shaft, and the barrier ring is located between the sheave and the rotating block; a groove is provided on the outside of the sheave on one side of the wire rope.

[0015] During the driving process, the high-speed rotation of the pulley will generate a certain amount of heat. The heat conduction channel and the heat exhaust port arranged between the heat conduction cavity, the pulley and the rotating block cooperate to produce a heat dissipation channel, so that the heat dissipation device inside the heat dissipation cavity can dissipate heat from the connection between the pulley and the bearing connection structure.

[0016] Beneficial effects

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. When the rope pulley is driven, it will generate a certain amount of heat due to its high-speed rotation. The heat conduction cavity, the heat conduction channel set between the rope pulley and the rotating block, and the heat exhaust port cooperate to produce a heat dissipation channel, so that the heat dissipation device inside the heat dissipation cavity can dissipate heat from the connection between the rope pulley and the bearing connection structure. By setting the groove, the diameter of the rope pulley is reduced, thereby reducing the heat accumulated in the rope pulley during the driving process, so as to achieve the improvement of the heat dissipation effect of the rope pulley driving end.

[0019] 2. A heat conduction channel is provided between the rope pulley and the rotating block to increase the heat dissipation effect of the rope pulley driving end. At the same time, the barrier ring provided in the heat conduction channel has a certain guiding effect on the airflow during high-speed rotation, thereby accelerating the heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0022] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 4 for Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0024] In the figure: 1. Traction machine housing; 11. Permanent magnet rotor; 111. Output shaft; 112. Connecting block; 113. Raised limit block; 114. Clamping block; 115. Barrier ring; 12. Heat dissipation cavity; 13. Stator core; 14. Stator winding; 2. Encoder; 3. Machine base; 31. Shock-absorbing pad; 4. Bearing connection structure; 41. Rotating block; 42. Bearing seat; 43. Engaging ring; 5. Pulley; 51. Heat conduction cavity; 52. Heat exhaust port; 53. Winding groove; 54. Welding block; 55. Groove; 56. Heat conduction channel; 57. Brake wheel; 6. Wire rope. DETAILED DESCRIPTION

[0025] This specific embodiment is a traction machine for a large freight elevator.

[0026] Bearings with better sealing properties are easier to oil and maintain, but the sheave and bearings will generate a lot of heat during the high-speed driving process. If the heat is not easy to release, it will easily lead to friction fire or aggravate the aging of the sheave, which is not conducive to the continued use of the traction machine and is dangerous.

[0027] Its structural diagram is as follows Figure 1-Figure 4 As shown. A traction machine for a large freight elevator includes a traction machine housing 1, wherein stator cores 13 are fixedly installed at the top and bottom of the traction machine housing 1, and a permanent magnet rotor 11 is rotatably installed between the stator cores 13 and on the inner wall of the traction machine housing 1. A plurality of sets of stator windings 14 are wound around the inner circle between the stator core 13 and the permanent magnet rotor 11. When the stator winding 14 is energized and the rotating magnetic field generated in the stator winding 14 matches the fixed magnetic field on the permanent magnet rotor 11, the permanent magnet rotor 11 will rotate following the change of the rotating magnetic field. A heat dissipation cavity 12 is provided at one end of the traction machine housing 1, and an air-cooled radiator is installed inside the heat dissipation cavity 12. The heat dissipation device inside the heat dissipation cavity 12 dissipates heat from the traction machine.

[0028] The traction machine also includes a base 3 welded to the bottom of the traction machine housing 1. Shock-absorbing pads 31 are installed at the bottom of the base 3. The shock-absorbing pads 31 effectively reduce operating noise and improve operating performance. The machine also includes encoders 2 welded to both sides of the traction machine housing 1. The encoders 2 measure the position and speed of the permanent magnet rotor 11 and transmit the signals to the control system for precise control and regulation. A sheave 5 is mounted at one end. A winding groove 53 is provided around the outer periphery of the sheave 5, around which a steel wire rope 6 is wound. A brake wheel 57 is mounted at one end of the sheave 5. An output shaft 111 is fixedly mounted to one end of the permanent magnet rotor 11. A connecting block 112 extends from one end of the output shaft 111. Multiple sets of raised stoppers 113 are welded to the outer periphery of the connecting block 112. A clamping block 114 extends from one end of the connecting block 112. The connecting block 112 and the clamping block 114 secure the sheave 5 to the permanent magnet rotor 11. The output shaft 111 is fixedly connected to the sheave 5, facilitating its rotation and thereby driving the elevator. The brake wheel 57 comprises two brake shoes, each hinged to the frame via two pins. Friction pads are fitted to the surfaces of the brake shoes, and the brake wheel 57 is fixedly connected to the output shaft 111 to be braked. The operating principle of the brake wheel 57 is as follows: during braking, the pump generates thrust that overcomes the spring force, causing the brake shoes to press against the brake wheel 57, thereby braking the output shaft 111.

[0029] The sheave 5 and the hoist housing 1 are rotatably mounted via a bearing connection structure 4. The bearing connection structure 4 includes a bearing seat 42 welded to the hoist housing 1. A rotating block 41 is rotatably mounted on one side of the bearing seat 42. The rotating block 41 and the bearing seat 42 are reinforced by an engagement ring 43. The engagement ring 43 ensures the stability of the rotating block 41's rotation on the bearing seat 42. The bearing connection structure 4 connects the sheave 5 to the hoist housing 1, ensuring a secure connection between the sheave 5 and the hoist housing 1 during rotation, preventing the sheave 5 from slipping and causing safety risks. Heat exhaust ports 52 are provided on one end of the sheave 5, on both ends of the bearing connection structure 4 and on one end of the traction machine housing 1. A heat conduction cavity 51 is provided on the sheave 5 at the position of the heat exhaust port 52. A heat conduction channel 56 is provided on the sheave 5 outside the heat exhaust port 52. The sheave 5 and the rotating block 41 are welded together by welding blocks 54. A blocking ring 115 is fixedly installed on the outer circle of the output shaft 111, and the blocking ring 115 is located between the sheave 5 and the rotating block 41. A groove 55 is provided on the outer circle of the sheave 5 on the side of the wire rope 6. During the driving process, the high-speed rotation of the pulley 5 generates a certain amount of heat. The heat conduction cavity 51, the heat conduction channel 56 set between the pulley 5 and the rotating block 41, and the heat exhaust port 52 cooperate to form a heat dissipation channel, thereby facilitating the heat dissipation device inside the heat dissipation cavity 12 to dissipate heat from the connection between the pulley 5 and the bearing connection structure 4. By setting the groove 55, the diameter of the pulley 5 is reduced, thereby reducing the heat accumulated in the pulley 5 during the driving process, thereby improving the heat dissipation effect of the driving end of the pulley 5. A heat conduction channel 56 is set between the pulley 5 and the rotating block 41 to increase the heat dissipation effect of the driving end of the pulley 5. At the same time, the blocking ring 115 set in the heat conduction channel 56 has a certain diversion effect on the airflow during high-speed rotation, thereby accelerating the heat extraction.

[0030] When the permanent magnet synchronous traction machine starts, the controller supplies three-phase alternating current to the stator winding 14. These currents generate a rotating magnetic field through the stator winding 14. The controller also monitors the fixed magnetic field on the permanent magnet rotor 11 and adjusts the current in the stator winding 14 according to the operating status and load conditions of the elevator or train. By adjusting the current magnitude and frequency, the controller can achieve magnetic field matching with the permanent magnet rotor 11. During the driving process, the high-speed rotation of the pulley 5 generates a certain amount of heat. The heat conduction cavity 51, the heat conduction channel 56 provided between the pulley 5 and the rotating block 41, and the heat exhaust port 52 cooperate to form a heat dissipation channel, thereby facilitating the heat dissipation device inside the heat dissipation cavity 12 to dissipate heat from the connection between the pulley 5 and the bearing connection structure 4. By providing the groove 55, the diameter of the pulley 5 is reduced, thereby reducing the heat accumulated in the pulley 5 during the driving process, thereby improving the heat dissipation effect at the driving end of the pulley 5. A heat conduction channel 56 is provided between the rope pulley 5 and the rotating block 41, which increases the heat dissipation channel of the driving end of the rope pulley 5. At the same time, the blocking ring 115 arranged in the heat conduction channel 56 has a certain guiding effect on the airflow during high-speed rotation, thereby accelerating the heat dissipation.

[0031] All technical features in this embodiment can be freely combined according to actual needs. The above embodiment is a preferred implementation scheme of the utility model. In addition, the utility model can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the scope of protection of the utility model.

Claims

1. A traction machine for a large freight elevator, characterized in that: The invention comprises a traction machine housing (1), a machine base (3) welded and mounted on the bottom of the traction machine housing (1), an encoder (2) welded and mounted on both sides of the traction machine housing (1), and a sheave (5) mounted at one end. Stator cores (13) are fixedly mounted at the top and bottom of the traction machine housing (1). A permanent magnet rotor (11) is rotatably mounted between the stator cores (13) and the inner wall of the traction machine housing (1). Multiple groups of stator windings (14) are wound around the inner circle between the stator core (13) and the permanent magnet rotor (11). The sheave (5) and the traction machine housing (1) are rotatably mounted via a bearing connection structure (4).

2. A traction machine for a large freight elevator according to claim 1, characterized in that: A heat dissipation cavity (12) is provided at one end of the traction machine housing (1), and an air-cooled radiator is installed inside the heat dissipation cavity (12).

3. A traction machine for a large freight elevator according to claim 2, characterized in that: A shock-absorbing pad (31) is installed at the bottom of the machine base (3).

4. A traction machine for a large freight elevator according to claim 3, characterized in that: A winding groove (53) is provided on the outer circle of the rope pulley (5), and a steel wire rope (6) is wound on the winding groove (53); a brake wheel (57) is installed on one end of the rope pulley (5); an output shaft (111) is fixedly installed on one end of the permanent magnet rotor (11); a connecting block (112) is extended and installed on one end of the output shaft (111); and a plurality of groups of protruding limit blocks (113) are welded and installed on the outer circle of the connecting block (112); a clamping block (114) is extended and installed on one end of the connecting block (112); the rope pulley (5) and the permanent magnet rotor (111) are clamped and fixed by the connecting block (112) and the clamping block (114).

5. A traction machine for a large freight elevator according to claim 4, characterized in that: The bearing connection structure (4) includes a bearing seat (42) welded to the traction machine housing (1), a rotating block (41) is rotatably mounted on one side of the bearing seat (42), and the rotating block (41) and the bearing seat (42) are engaged and reinforced by an engaging ring (43).

6. A traction machine for a large freight elevator according to claim 5, characterized in that: A heat dissipation port (52) is provided on one end of the rope pulley (5), on both ends of the bearing connection structure (4), and on one end of the traction machine housing (1); a heat conduction cavity (51) is provided on the rope pulley (5) at the position of the heat dissipation port (52); a heat conduction channel (56) is provided on the rope pulley (5) outside the heat dissipation port (52); the rope pulley (5) and the rotating block (41) are welded and installed through the welding block (54); a blocking ring (115) is fixedly installed on the outer circle of the output shaft (111), and the blocking ring (115) is located between the rope pulley (5) and the rotating block (41); a groove (55) is provided on the outer circle of the rope pulley (5) on one side of the wire rope (6).

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