CN213202017U

CN213202017U - Screw elevator

Info

Publication number: CN213202017U
Application number: CN202021584470.4U
Authority: CN
Inventors: 林晓丽; 蔡珉; 林友富
Original assignee: Taizhou Yongxing Trading Co ltd
Current assignee: Taizhou Yongxing Trading Co ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2021-05-14
Anticipated expiration: 2030-08-03

Abstract

The utility model provides a screw rod elevator belongs to elevator technical field. The elevator car comprises a longitudinal shaft, a car body, a guide rail and a plurality of screw rods, the car body is connected with the screw rods, the guide rail is fixedly arranged on the inner wall of the longitudinal shaft, a driving control mechanism is arranged between each screw rod and the car body, the driving control mechanism comprises a threaded sleeve matched with the screw rods, a sleeve is connected outside the threaded sleeve in a rotating mode, an installation cavity is formed between the middle of the sleeve and the inner wall of the threaded sleeve, a rotor located in the installation cavity is connected to the threaded sleeve through splines, a plurality of permanent magnet strips are arranged on the rotor, a plurality of stator iron cores which are uniformly distributed in the circumferential direction are arranged on the inner wall of the sleeve, an electrified coil is wound on each stator iron core, the stator iron core is located in the middle of the sleeve, a first reset spring is connected between the upper. The utility model has the advantages of good comfort, simple structure, etc.

Description

Screw elevator

Technical Field

The utility model belongs to the technical field of the elevator, a screw rod elevator is related to.

Background

The screw elevator uses the rotation of the screw to push the elevator structure of the lift car to rise and fall, the screw elevator has positive effects of saving building area, reducing civil engineering area, reducing elevator cost and operation stability, but the screw elevator has larger mechanical noise, has slightly poorer comfort degree than a traction type elevator and a hydraulic type elevator, and is driven by the end part of the screw so that the operation stroke of the screw elevator is limited.

On screw elevator's drive method and braking mode, prior art does not have better solution, mostly set up the motor through the screw tip and drive the screw rod, realize flat bed control and emergent through braking the motor, because screw elevator is higher to the roughness and the required precision of screw rod, not only cause screw rod stress to concentrate and wearing and tearing easily by tip driven mode, but also can cause the screw rod to warp when the car moves to the screw rod middle part, probably cause the car card to die when serious, have the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a screw rod elevator to the above-mentioned problem that prior art exists, the utility model aims to solve the technical problem how simplify the structure of elevator, improve the elevator travelling comfort.

The purpose of the utility model can be realized by the following technical proposal: a screw elevator is characterized by comprising a longitudinal shaft, a car, a guide rail and a plurality of screws, wherein the car is connected with the screws, the guide rail is fixedly arranged on the inner wall of the longitudinal shaft, a drive control mechanism is arranged between each screw and the car, the drive control mechanism comprises a threaded sleeve matched with the screws, a sleeve is rotationally connected outside the threaded sleeve, an installation cavity is formed between the middle part of the sleeve and the inner wall of the threaded sleeve, a rotor positioned in the installation cavity is connected to the threaded sleeve through splines, a plurality of permanent magnetic strips are arranged on the rotor, a plurality of stator iron cores which are uniformly distributed in the circumferential direction are arranged on the inner wall of the sleeve, an electrified coil is wound on each stator iron core, the stator iron cores are positioned at the middle part of the sleeve, a first reset spring is connected between the upper end of the rotor and the threaded sleeve, and a second reset spring is connected between the lower end of the rotor, the sleeve and the guide rail are matched to slide longitudinally under the condition of limiting the rotation of the sleeve.

Further, under the condition that the thread bushing is not affected by external force, the upper end of the stator core is higher than the top of the rotor, and the lower end of the stator core is higher than the bottom of the rotor.

Further, the distribution rule of the plurality of permanent magnet strips on the rotor is as follows: the magnetic pole direction is parallel to the radial line of the thread sleeve, each permanent magnet strip forms a spiral guide groove on the outer wall surface of the rotor, and adjacent permanent magnet strips and the rotor are bonded and fixed by resin; and hydraulic oil is filled in the mounting cavity.

Furthermore, a plurality of circulation holes penetrating through the upper end and the lower end of the rotor are formed in the rotor.

Furthermore, the circulation hole is formed by surrounding a circulation groove arranged between adjacent spline grooves on the rotor and the outer wall surface of the thread sleeve.

Furthermore, two ends of the threaded sleeve are respectively provided with a shaft shoulder, the shaft shoulders are connected with the sleeve through bearings, and the upper end of the first return spring and the lower end of the second return spring are respectively abutted against the two shaft shoulders at the upper end and the lower end of the threaded sleeve.

Furthermore, a plurality of flat layer positioning holes are formed in the guide rail, the sleeve is connected with an installation block, a sliding groove matched with the guide rail is formed in the installation block, and an electromagnetic control bolt is arranged on the installation block and can be inserted into the flat layer positioning holes.

Furthermore, all the electrified coils are connected in parallel and then connected with a controller arranged in the car.

The controller is an electrical unit for controlling the current magnitude and the current direction of the electrified coil according to the requirement, and obviously, the controller is a conventional means in the field and is not described herein again.

Further, be provided with an oil pump in the car, an oil tank is connected to the oil feed end of oil pump, the installation cavity is connected to the end that produces oil of oil pump, be provided with the radiator between installation cavity and the oil pump end that produces oil.

The hydraulic oil in the installation cavity is circulated through the oil pump, the cooling and heat dissipation are carried out on the hydraulic oil, and the driving force of the oil pump is small and is only used for circulating the hydraulic oil.

The rotor, the stator core and the electrified coil three wound on the stator core form an external coil motor, and the electrified coil is located on the sleeve without structures such as an electric brush.

The working process is as follows:

ascending of the elevator: in the starting stage, due to the existence of longitudinal inertia force, the rotor is positioned at a lower position in the installation cavity, namely more permanent magnet strips on the rotor are positioned at the lower end of the stator core compared with the permanent magnet strips in the initial state and cannot be effectively utilized, and the torque generated by electrifying the coil to the rotor is smaller, namely the elevator starts slowly; when the running speed of the car is close to the uniform speed, the rotor gradually recovers the initial state under the action of the first return spring and the second return spring, namely more permanent magnet strips enter the effective area to generate larger torque to act on the rotor, the permanent magnet strips entering the effective area are gradually increased in the process, namely the driving force of the screw rod is gradually increased, the longitudinal running stability of the car is ensured, and the comfort is improved.

Deceleration leveling in the ascending process of the elevator: the current direction of the control energizing coil is opposite to the current direction when the elevator is driven to move upwards, under the action of inertia force, the lift car longitudinally moves upwards relative to the rotor, the effective magnetic field on the rotor is reduced, the reverse driving force given to the rotor by the energizing coil is smaller, the problem that the lift car is unstable and the screw is damaged due to overlarge braking force is avoided, after the running speed of the lift car is reduced, the effective magnetic field of the rotor is increased, the braking force is increased until the lift car is braked and stopped, in order to enable the leveling position to be accurate, the positioning is realized through the leveling positioning hole and the plug pin, the plug pin is pressed through the spring, and the plug pin can be inserted into the leveling positioning hole under the.

In the ascending process of an elevator, under the action of the guide groove on the rotor, hydraulic oil forms positive pressure in the mounting cavity below the rotor and negative pressure in the mounting cavity above the rotor, so that the rotor can be located at the position of the maximum effective magnetic field at a certain rotating speed, the load of the lift car needs to be overcome when the lift car ascends, the required driving force is larger, but in the starting stage, namely the stage that the rotating speed of the rotor is smaller, the hydraulic action is extremely small, and the position of the threaded sleeve relative to the sleeve is mainly influenced by the inertia force.

Descending the elevator: the electrified coil is controlled to enable the current direction to be opposite to the current direction when the elevator ascends, the current size is smaller than that when the elevator ascends, the rotor and the screw rod rotate synchronously at the initial stage when the elevator descends, the car moves downwards longitudinally, and in the starting stage, due to the existence of longitudinal inertia force, the rotor is located at a higher position in the installation cavity, namely, the effective magnetism of the rotor is more, namely, the screw rod starts with larger torque; when the running speed of the car is close to the uniform speed, the rotor gradually recovers the initial state under the action of the first return spring and the second return spring, the hydraulic pressure in the installation cavity at the upper end of the rotor is greater than the hydraulic pressure in the installation cavity at the lower end of the rotor due to the rotation of the rotor, the rotor tends to be close to the lower end of the installation cavity, the effective magnetic field of the rotor is rapidly reduced in the state, namely, the rotor is in a downward speed control state, the gravity of the car is overcome, the permanent magnetic strips entering the effective area are gradually reduced in the process, namely, the driving force of the screw rod is gradually weakened, and the stability of the longitudinal downward movement.

Deceleration leveling in the descending process of the elevator: the direction of current of the control electrified coil is opposite to the direction of current when the elevator is driven to move downwards, the lift car moves downwards relative to the rotor longitudinally under the action of inertia force, the effective magnetic field on the rotor is increased, the reverse driving force given to the rotor by the electrified coil is increased, the current based on the electrified coil in the downward process is smaller, the braking force is also very large, after the running speed of the lift car is reduced, the effective magnetic field of the rotor is further increased, the braking force is further increased until the lift car is braked and stopped, in order to enable the position of a leveling layer to be accurate, the positioning can be realized through a leveling layer positioning hole, and the same as the process of the upper leveling layer and the lower leveling layer, the braking force is also gradually increased in the process of the lower leveling layer, and the required stability.

This scheme has the advantage:

1. when the elevator goes up to a flat floor, the braking force is increased from small to small, the impact of deceleration can be relieved, and quick braking is not needed when the elevator goes up to the flat floor because the resistance exists originally when the elevator car goes up; when the elevator descends to a flat floor, the braking force of the elevator is slightly increased from small to small and then rapidly reduced, and under the condition of restraining the inertia force of the elevator car during descending, the progressively-reduced braking force is rapidly reduced so as to achieve higher comfort and flat floor smoothness.

2. The torque of the rotation of the driving screw and the torque of the stopping of the driving screw are not rigidly acted on the screw, but are flexible, namely, contact-free, and the acting force position moves along with the movement of the car, so that the situation that the screw is not axially limited to cause large external force is avoided, and the stress deformation of the screw can be prevented.

3. And the rotor, the stator core and other components are in an oil immersion state, the high-temperature influence is small, and the automatic lubrication is realized on the screw rod.

4. The drive control mechanism of the elevator greatly simplifies the whole structure, occupies extremely small space of a shaft, and realizes the integrated realization of driving and braking.

Drawings

FIG. 1 is a schematic structural diagram of the control mechanism in an equilibrium state

Fig. 2 is a schematic structural diagram of the control mechanism with more effective magnetic fields.

Fig. 3 is a schematic diagram of the control mechanism with less effective magnetic field.

Fig. 4 is a sectional view taken along a-a in fig. 2.

Fig. 5 is a schematic plan view of the rotor.

In the figure, 1, a car; 2. a guide rail; 3. a screw; 41. a threaded sleeve; 42. a sleeve; 43. a mounting cavity; 44. a rotor; 45. a first return spring; 46. a second return spring; 47. a flow-through hole; 51. a permanent magnet strip; 52. a stator core; 53. an electrified coil; 54. and a guide groove.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, 4 and 5, the elevator comprises a longitudinal hoistway, a car 1, a guide rail 2 and a plurality of screw rods 3, wherein the car 1 is connected with the screw rods 3, the guide rail 2 is fixedly arranged on the inner wall of the longitudinal hoistway, a driving control mechanism is arranged between each screw rod 3 and the car 1, the driving control mechanism comprises a threaded sleeve 41 matched with the screw rod 3, a sleeve 42 is rotatably connected outside the threaded sleeve 41, a mounting cavity 43 is formed between the middle part of the sleeve 42 and the inner wall of the threaded sleeve 41, a rotor 44 positioned in the mounting cavity 43 is connected on the threaded sleeve 41 in a spline manner, a plurality of permanent magnet strips 51 are arranged on the rotor 44, a plurality of stator cores 52 uniformly distributed in the circumferential direction are arranged on the inner wall of the sleeve 42, an energizing coil 53 is wound on each stator core 52, the stator core 52 is positioned in the middle part of the sleeve 42, a first return spring 45 is connected between the, a second return spring 46 is connected between the lower end of the rotor 44 and the threaded sleeve 41, and the sleeve 42 is matched with the guide rail 2 and can slide longitudinally under the condition of limiting the rotation of the sleeve 42.

In the case where the threaded sleeve 41 is not subjected to an external force, the upper end of the stator core 52 is higher than the top of the rotor 44, and the lower end of the stator core 52 is higher than the bottom of the rotor 44.

The distribution rule of the plurality of permanent magnet strips 51 on the rotor 44 is as follows: the magnetic pole direction is parallel to the radial line of the thread bush 41, each permanent magnet strip 51 forms a spiral guide groove 54 on the outer wall surface of the rotor 44, and the adjacent permanent magnet strips 51 and the rotor 44 are bonded and fixed through resin; the installation cavity 43 is filled with hydraulic oil.

The rotor 44 is provided with a plurality of flow holes 47 which penetrate through the upper and lower ends of the rotor 44.

The flow hole 47 is formed by surrounding the outer wall surface of the threaded sleeve 41 with a flow groove provided between adjacent spline grooves on the rotor 44.

Two ends of the threaded sleeve 41 are respectively provided with a shaft shoulder, the shaft shoulders are connected with the sleeve 42 through bearings, and the upper end of the first return spring 45 and the lower end of the second return spring 46 respectively abut against the two shaft shoulders at the upper end and the lower end of the threaded sleeve 41.

A plurality of flat layer positioning holes are formed in the guide rail 2, the sleeve 42 is connected with an installation block, a sliding groove matched with the guide rail 2 is formed in the installation block, an electromagnetically controlled bolt is arranged on the installation block, and the bolt can be inserted into the flat layer positioning holes.

The current coils 53 are connected in parallel and are connected to a controller provided in the car 1. The controller is an electrical unit for controlling the current magnitude and the current direction of the electrified coil 53 according to the requirement, and obviously, the controller is a conventional means in the field and is not described herein again.

An oil pump is arranged in the car 1, an oil tank is connected to the oil inlet end of the oil pump, the oil outlet end of the oil pump is connected with the installation cavity 43, and a radiator is arranged between the installation cavity 43 and the oil outlet end of the oil pump. The hydraulic oil in the mounting cavity 43 is circulated through the oil pump, and the hydraulic oil is cooled and radiated, so that the driving force of the oil pump is small and is only used for circulating the hydraulic oil.

The rotor 44, the stator core 52 and the energizing coil 53 wound on the stator core 52 form an external coil motor, and the energizing coil 53 is located on the sleeve 42, so that structures such as brushes and the like are not needed.

The working process is as follows:

ascending of the elevator: in the starting stage of the upward movement of the elevator, the rotor 44 and the screw rod 3 rotate synchronously, the car 1 moves upwards longitudinally under the limit matching of the threaded sleeve 41 and the guide rail 2, and in the starting stage, due to the existence of longitudinal inertia force, the rotor 44 is located at a lower position in the installation cavity 43, namely, as shown in fig. 3, namely, the permanent magnet strips 51 on the rotor 44 are located at the lower end of the stator core 52 and cannot be effectively utilized compared with the permanent magnet strips 51 in the initial state, and the torque generated on the rotor 44 after the energizing coil 53 is energized is smaller, namely, the elevator starts slowly; when the running speed of the car 1 approaches the constant speed, the rotor 44 gradually returns to the initial state under the action of the first return spring 45 and the second return spring 46, that is, the position shown in fig. 1 is that more permanent magnet strips 51 enter the effective area, and a larger torque is generated to act on the rotor 44, and in the process, the permanent magnet strips 51 entering the effective area are gradually increased, that is, the driving force of the screw 3 is gradually increased, so that the stable longitudinal running of the car 1 is ensured, and the comfort is improved.

Deceleration leveling in the ascending process of the elevator: the current direction of the control energizing coil 53 is opposite to the current direction when the elevator is driven to move upwards, under the action of inertia force, the car 1 longitudinally moves upwards relative to the rotor 44, the effective magnetic field on the rotor 44 is reduced, the reverse driving force given to the rotor 44 by the energizing coil 53 is smaller, the problem that the car 1 is unstable and the screw 3 is damaged due to overlarge braking force is avoided, after the running speed of the car 1 is reduced, the effective magnetic field of the rotor 44 is increased, the braking force is increased until the car 1 is braked and stopped, in order to enable the leveling position to be accurate, the positioning is realized through the leveling positioning hole and the plug pin, the plug pin is pressed through a spring, and can be inserted into the leveling positioning hole under the control of an electromagnetic valve after.

During the ascending process of the elevator, under the action of the guide groove 54 on the rotor 44, hydraulic oil forms positive pressure in the mounting cavity 43 below the rotor 44, and negative pressure is formed in the mounting cavity 43 above the rotor 44, so that the rotor 44 can be located at the position of the maximum effective magnetic field, namely the position shown in fig. 2, at a certain rotating speed, because the load of the car 1 needs to be overcome when the car 1 ascends, the required driving force is larger, but at the starting stage, namely the stage when the rotating speed of the rotor 44 is lower, the hydraulic pressure has little effect, and the position of the threaded sleeve 41 relative to the sleeve 42 is mainly influenced by inertia force.

Descending the elevator: the electrified coil 53 is controlled to enable the current direction to be opposite to the current direction when the elevator ascends, the current size is smaller than that when the elevator ascends, the rotor 44 and the screw rod 3 rotate synchronously at the initial stage of the descending of the elevator, the car 1 moves downwards longitudinally, and in the starting stage, due to the existence of longitudinal inertia force, the rotor 44 is located at a higher position in the installation cavity 43, namely, the effective magnetism of the rotor 44 is more, namely, the screw rod 3 starts with larger torque; when the running speed of the car 1 is close to the constant speed, the rotor 44 gradually recovers to the initial state under the action of the first return spring 45 and the second return spring 46, and the rotor 44 rotates to cause the hydraulic pressure in the installation cavity 43 at the upper end of the rotor 44 to be greater than the hydraulic pressure in the installation cavity 43 at the lower end, the rotor 44 tends to approach to the position at the lower end of the installation cavity 43, the effective magnetic field of the rotor 44 is rapidly reduced under the state, namely, the rotor is in a downward speed control state, the gravity of the car 1 is overcome, the permanent magnetic strips 51 entering the effective area are gradually reduced in the process, namely, the driving force of the screw 3 is gradually reduced, and the stability of the longitudinal downward movement of the car 1.

Deceleration leveling in the descending process of the elevator: the current direction of the electrified coil 53 is controlled to be opposite to the direction when the elevator is driven to move downwards, under the action of inertia force, the car 1 moves downwards longitudinally relative to the rotor 44, the effective magnetic field on the rotor 44 is increased, the reverse driving force given to the rotor 44 by the electrified coil 53 is increased, and the braking force is also very large based on the fact that the current of the electrified coil 53 is small when the elevator moves downwards, after the running speed of the car 1 is reduced, the effective magnetic field of the rotor 44 is further increased, the braking force is further increased until the car 1 is braked and stopped, and in order to enable the position of the leveling layer to be accurate, the positioning can be realized through the leveling positioning hole.

The car referred to in the figures is a connection of the bushing to the car.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The screw elevator is characterized by comprising a longitudinal shaft, a car (1), a guide rail (2) and a plurality of screws (3), wherein the car (1) is connected with the screws (3), the guide rail (2) is fixedly arranged on the inner wall of the longitudinal shaft, a drive control mechanism is arranged between each screw (3) and the car (1), the drive control mechanism comprises a threaded sleeve (41) matched with the screws (3), a sleeve (42) is rotatably connected outside the threaded sleeve (41), an installation cavity (43) is formed between the middle part of the sleeve (42) and the inner wall of the threaded sleeve (41), a rotor (44) positioned in the installation cavity (43) is in splined connection with the threaded sleeve (41), a plurality of permanent magnetic strips (51) are arranged on the rotor (44), and a plurality of stator iron cores (52) which are circumferentially and uniformly distributed are arranged on the inner wall of the sleeve (42), go up around being equipped with circular telegram coil (53) on each stator core (52), stator core (52) are located the middle part of sleeve pipe (42), be connected with reset spring (45) between the upper end of rotor (44) and thread bush (41), be connected with reset spring two (46) between the lower extreme of rotor (44) and thread bush (41), sleeve pipe (42) and guide rail (2) cooperation can be in the vertical slip of restriction sleeve pipe (42) under the rotatory condition.

2. Screw elevator according to claim 1, characterized in that the upper end of the stator core (52) is higher than the top of the rotor (44) and the lower end of the stator core (52) is higher than the bottom of the rotor (44) without the threaded sleeve (41) being subjected to external forces.

3. Screw elevator according to claim 1 or 2, characterized in that the permanent-magnet bars (51) on the rotor (44) are distributed according to the following rule: the magnetic pole direction is parallel to the radial line of the thread sleeve (41), each permanent magnet strip (51) forms a spiral guide groove (54) on the outer wall surface of the rotor (44), and the adjacent permanent magnet strips (51) and the rotor (44) are bonded and fixed through resin; and hydraulic oil is filled in the mounting cavity (43).

4. The screw elevator according to claim 3, characterized in that the rotor (44) is provided with a plurality of flow holes (47) passing through the upper and lower ends of the rotor (44).

5. Screw elevator according to claim 4, characterized in that the flow openings (47) are formed by flow grooves arranged between adjacent spline grooves on the rotor (44) surrounding the outer wall surface of the threaded sleeve (41).