KR101161023B1 - Nut driven elevator - Google Patents

Abstract

PURPOSE: A nut driven type elevator is provided to increase lifting speed of the elevator by lifting a car while driving a screw nut instead of a screw shaft. CONSTITUTION: A nut driven type elevator comprises a main frame, a car(70), a screw shaft, and a drive unit. The main frame is extended to a vertical direction. The car is lifted along the main frame and a boarding space is formed inside the vehicle. The screw shaft is installed between the main frame and the car and is extended in parallel with the main frame. A screw is formed in the outer circumference of the screw shaft. The drive unit lifts the car.

Description

Nut driven elevator

The present invention relates to an elevator, and more particularly, to a nut-driven elevator for elevating the elevator by driving a nut screwed.

Elevators can be divided into high and low floors according to the stroke distance.

In general, a high-rise elevator includes a cable connected to a car and a car lifted by a winding or unwinding the cable using a traction machine.

The low-rise elevator is generally used with a hydraulic drive system and a screw drive system.

The hydraulic drive method is a method of lifting and lowering a car using a hydraulic cylinder. Since the hydraulic elevator lifts the car by the hydraulic cylinder, not only the noise is severe, but also the riding speed is not good because the lifting speed is difficult to adjust, and there is a problem such as causing fear to the user when starting and stopping.

The screw driving method is a method of elevating a car engaged with it by rotating a screw placed in a vertical direction. However, the screw driving method is to drive the screw directly, when the rotation speed of the screw increases the centrifugal force of the screw is strong, the shaking phenomenon is severe, there is a disadvantage that the lifting speed is slow. In addition, there is a problem that the screw length that can be used due to the risk of buckling is limited because the screw must be rotated, thereby limiting the maximum stroke distance of the elevator. In addition, the structural stability of the elevator is reduced because the screw supporting the car must be rotated.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide an elevator having a high lift speed and a good ride comfort.

It is another object of the present invention to provide an elevator having excellent structural stability and capable of making the maximum stroke length of the elevator long.

In order to solve the above problems, the present invention, the main frame extending in the vertical direction; Lifting along the main frame, the car is formed a boarding space therein; A screw shaft installed between the main frame and the car, extending in parallel with the main frame, and having a screw formed on an outer circumferential surface thereof; And a drive unit for elevating the car, wherein the drive unit comprises: a fixed frame fixed to a surface facing the main frame of the car and integrally elevating with the car; A screw nut rotatably supported by the fixing frame and having an inner circumferential surface engaged with the screw shaft and rotating in one direction and an opposite direction to raise and lower the fixing frame; A driven pulley coupled to the screw nut and integrally rotating with the screw nut; A drive motor providing a driving force for driving the screw nut; A drive pulley coupled to a drive shaft of the drive motor to rotate by a drive force of the drive motor; And a drive belt wound around the drive pulley and the driven pulley to transmit a driving force of the drive motor to the screw nut.

Preferably, the drive unit further includes a pair of bearings provided at upper and lower ends of the screw nut to rotatably support the screw nut.

Preferably, the screw nut has an inner diameter larger than the diameter of the screw thread of the screw shaft, and is provided with a lubricating oil storage groove formed at a predetermined length along the axial direction at the stop of the screw nut.

Preferably, the screw shaft further includes a lubricating unit for supplying lubricating oil, wherein the lubricating unit is immersed in a lubricating oil container in which the lubricating oil is stored, and one end is immersed in the lubricating oil stored in the lubricating oil container, and the other end is provided on an outer circumferential surface of the screw shaft. It may include a wick in contact.

The main frame is provided with a guide rail for guiding the movement path of the car, and the fixed frame is provided with a guide roller sliding along the guide rail, wherein the guide rail, the amount of the main frame Protruding in the inward direction from the side, the guide rollers are provided in pairs on the upper and lower ends of both sides of the fixing frame can slide along the front and rear of the guide rail.

It may further include an emergency drive motor for rotating the screw shaft in the emergency when the power supplied to the drive motor is cut off, the emergency drive motor is a DC motor capable of brake, except in the emergency It is desirable to prevent rotation.

The fixing frame may include an upper plate and a lower plate, and the upper plate and the lower plate may include a shaft insertion groove in which a planar shape is opened in a 'U' shape and the screw shaft is inserted into the car. .

In addition, when the screw nut is driven in a direction in which the car descends while the car is located below a predetermined height, it is preferable that the screw shaft rotates and rises by the rotation of the screw nut.

According to an embodiment of the present invention, since the car is moved by driving the screw nut instead of the screw shaft, the lifting speed of the elevator is quick and smooth, and the riding comfort is improved.

In addition, according to an embodiment of the present invention, since the screw nut is driven instead of the screw shaft, the structural stability of the elevator is improved, and as the risk of buckling is reduced, the screw shaft can be made long, so that the maximum stroke distance of the elevator is increased. have.

In addition, according to an embodiment of the present invention, by replacing the hydraulic drive method with the nut drive method has the effect of oil leakage prevention and noise reduction.

In addition, according to an embodiment of the present invention, the shaft insertion groove having a planar shape of the 'U' shape is provided to facilitate the assembly and disassembly of the elevator.

In addition, according to an embodiment of the present invention, when the screw nut is driven in the direction in which the car descends while the car is located below a predetermined height, the screw shaft is rotated and raised by the rotation of the screw nut, thereby over-rotating the screw nut. There is an effect that is prevented.

In addition, according to one embodiment of the present invention, the lubricating oil is continuously applied to the screw shaft by the lubrication unit, there is an effect that no separate management for lubricating oil application is required.

1 is a front view of a nut-driven elevator according to an embodiment of the present invention.
2 is a plan view of a nut-driven elevator according to an embodiment of the present invention.
3 is a perspective view of a fixing frame in a nut-driven elevator according to an embodiment of the present invention.
4 is an enlarged view of a portion A of FIG. 2.
5 is a front view illustrating a drive system of a car including a drive unit in a nut-driven elevator according to an embodiment of the present invention.
FIG. 6 is an enlarged view of a portion B of FIG. 5.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a front view of a nut driven elevator according to an embodiment of the present invention, FIG. 2 is a plan view of a nut driven elevator according to an embodiment of the present invention, and FIG. 3 is a nut according to an embodiment of the present invention. In a drive type elevator, it is a perspective view of a fixed frame.

4 is an enlarged view of a portion A of FIG. 2, FIG. 5 is a front view illustrating a drive system of a car including a drive unit in a nut-driven elevator according to an embodiment of the present invention, and FIG. 5 is an enlarged view of a portion B. FIG.

Hereinafter, referring to FIGS. 1 and 2, the side where the car is arranged is referred to as 'front', and the side where the main frame is arranged as 'rear'.

Nut-driven elevator according to an embodiment of the present invention, the main frame 10 extending in the vertical direction, the car 70 is elevated along the main frame 10, the boarding space is formed therein, and the main A screw shaft 40 installed between the frame 10 and the car 70, extending in parallel with the main frame 10, and having a screw formed on an outer circumferential surface thereof, a drive unit for elevating the car 70, and a screw; Lubrication unit 60 for supplying lubricating oil to the shaft 40, and emergency drive motor 43 for rotating the screw shaft 40 in the emergency when the power supplied to the drive motor 52 is cut off.

In the nut-driven elevator according to an embodiment of the present invention, the drive unit is fixed to a surface of the car 70 that faces the main frame 10 and is fixed to the car 70 by lifting up and down integrally. And a screw nut 50 rotatably supported by the fixing frame 20, the inner circumferential surface thereof meshes with the screw shaft 40, and rotates in one direction and the opposite direction to raise and lower the fixing frame 20. A driven pulley 51 coupled to the nut 50 and integrally rotating with the screw nut 50, a driving motor 52 providing a driving force for driving the screw nut 50, and a driving motor 52. The driving force of the driving motor 52 is wound around the driving pulley 54 and the driving pulley 54 and the driven pulley 51 which are coupled to the driving shaft 53 and rotated by the driving force of the driving motor 52. 50 and a driving belt 55 for transmitting to the upper and lower ends of the screw nut 50 It includes a bearing 56, a pair of rotatably supporting the crew nut (50).

First, the main frame 10, the car 70, and the screw shaft 40 will be described.

The main frame 10 is arranged in a direction perpendicular to the pair of side members 11 and spaced apart from each other and parallel to the vertical direction, both ends of the pair of side members 11, respectively Combined and the rear member 12 is arranged at equal intervals in the vertical direction, and the upper surface member 15 of the plate shape is coupled to the upper end of the side member 11, the overall flat shape 'c' with the front open It becomes a child shape. The main frame 10 becomes the overall skeleton of the elevator. The main frame 10 is installed at a predetermined height along the wall of the building 90 and becomes a moving path of the car 70. The main frame 10 is provided with a guide rail 13 for guiding the movement path of the car 70.

The guide rail 13 protrudes inward from the opposing surfaces of both side members 11 of the main frame 10. The guide rail 13 is preferably formed at least as far as the stroke distance of the car 70 along the height direction of the main frame 10. A guide roller 31, which will be described later, is in contact with the guide rail 13 to slide.

The car 70 is a box-shaped structure having a boarding space therein, and is lifted along the main frame 10. Although not shown, the car 70 may be provided with an entrance door for a passenger. The drive unit for elevating the car 70 is provided on the surface of the car 70 facing the main frame 10.

The screw shaft 40 is formed with a screw on the outer circumferential surface, and is installed in the space between the main frame 10 and the car 70 in parallel with the main frame 10, that is, in the vertical direction. The upper end of the screw shaft 40 is inserted into and fixed to the upper bearing 42 provided on the upper surface member 15 of the main frame 10, and the lower end of the screw shaft 40 is connected to the emergency drive motor 43. . The upper end of the screw shaft 40 is inserted into and fixed to the hollow shaft of the upper bearing 42 to prevent the screw shaft 40 from flowing laterally. The emergency drive motor 43 is composed of a DC motor to fix the screw shaft 40 so that the screw shaft 40 does not rotate normally. The emergency drive motor 43 is for elevating the car 70 in an emergency, such as during a power failure during operation of the nut-driven elevator according to an embodiment of the present invention, the configuration thereof will be described in detail below.

Next, the drive unit will be described.

The fixing frame 20 is coupled to both sides of the upper plate 21 and the lower plate 22 and the upper plate 21 and the lower plate 22 which are placed on the horizontal plane and spaced apart from each other in the vertical direction, and as long as the height is increased in the vertical direction. And a pair of side plates 25. The fixed frame 20 is fixed to the car 70 and lifts up and down integrally with the car 70. The drive unit is fixedly installed on the fixed frame 20, and the car 70 moves up and down by driving the drive frame 20 up and down along the main frame 10 when the drive unit is driven.

The upper plate 21 and the lower plate 22 are provided with a shaft insertion groove 23 in which a planar shape is a 'U' shape in which the car 70 is open toward the car 70 and the screw shaft 40 is inserted therein. At the corners facing the car 70 of the upper plate 21 and the lower plate 22, coupling surfaces 26 are bent in the vertical direction to fix the fixing frame 20 to the car 70. The fixing frame 20 may be coupled to the car 70 by fastening or welding a bolt in a state in which the coupling surface 26 is against the car 70.

The reason why the shaft insertion groove 23 is formed in the fixed frame 20 is to increase the ease of assembly and disassembly of the elevator. The screw shaft 40 is the longest component with the main frame 10 in the nut-driven elevator according to an embodiment of the present invention. Therefore, the operation of coupling and disassembling the screw shaft 40 in the vertical direction to the fixed frame 20 is very cumbersome and takes a long time. However, when the U-shaped shaft insertion groove 23 is provided in the fixed frame 20, the screw shaft 40 can be inserted and assembled from the side of the fixed frame 20, thereby assembling and disassembling the device. There is an effect that becomes easy.

A pair of guide rollers 31 sliding along the guide rail 13 are provided at the upper and lower ends of both side plates 25 of the fixed frame 20. In addition, the auxiliary guide roller 32 is provided between the pair of guide rollers 31 in the direction perpendicular to the guide rollers 31.

The pair of guide rollers 31 are arranged in a line in the front-rear direction, and the guide rails 13 are interposed between the guide rollers 31. The guide roller 31 guides the movement of the fixed frame 20 and the car 70 by sliding along the guide rail 13. In addition, the guide roller 31 not only guides the movement of the car 70 but also serves to fix the fixing frame 20 so as not to rotate about the screw shaft 40 when the screw nut 50 rotates. .

The auxiliary guide roller 32 contacts the front end of the guide rail 13 and slides to maintain a constant distance between the fixed frame 20 and the main frame 10. By providing the auxiliary guide roller 32, the fixed frame 20 is prevented from swinging in the left and right directions when lifting.

The screw nut 50 is disposed between the upper plate 21 and the lower plate 22 of the fixed frame 20 and is rotatably supported by a pair of bearings 56 provided at the upper and lower ends. On the inner circumferential surface of the screw nut 50 is formed an internal thread which engages with the screw shaft 40. The pair of bearings 56 are fixed to the upper plate 21 and the lower plate 22 by fastening means such as bolts 58, respectively. The outer circumferential surface of the screw nut 50 is provided with a driven pulley 51 coupled to the screw nut 50 and integrally rotating with the screw nut 50.

The drive motor 52 is installed in the fixed frame 20 and provides a rotational driving force to the screw nut 50. The drive pulley 54 which is rotated by the drive force of the drive motor 52 is coupled to the drive shaft 53 of the drive motor 52. When the driving motor 52 is driven while the driving belt 55 is wound around the driving pulley 54 and the driven pulley 51, the driving force of the driving motor 52 is transmitted to the screw nut 50, and the screw nut 50 ) Rotates in one or the opposite direction. When the screw nut 50 rotates in one direction or the opposite direction according to the driving of the driving motor 52, the fixed frame 20 is raised and lowered, and the car 70 is also raised and lowered integrally with the fixed frame 20. do.

At the interruption of the screw nut 50, a lubricating oil storage groove 57 having an inner diameter larger than the diameter of the thread of the screw shaft 40 is formed by a predetermined length along the axial direction of the screw nut 50. Lubricant is stored in the lubricating oil storage groove 57, which is applied to the outer circumferential surface of the screw shaft 40 when the screw nut 50 and the screw shaft 40 move relative to each other. The relative rotation of the screw shaft 40 and the screw nut 50 is smoothly performed by the lubricating action of the lubricating oil.

The lubrication unit 60 includes a wick 62 in which lubricating oil is stored, and a wick 62 whose one end is immersed in lubricating oil stored in the lubricating oil container 61 and whose other end is in contact with the outer circumferential surface of the screw shaft 40. Include. Lubricant stored in the lubricant container 61 is continuously applied to the screw shaft 40 through the wick 62. In addition, when too much lubricant is applied to the screw shaft 40, the lubricant is absorbed by the wick 62 again. Therefore, the screw shaft 40 can always be maintained in a state where a certain amount of lubricant is applied. In this way, since the lubricating oil continuously flows out of the wick 62 little by little and is applied to the screw shaft 40 to perform a lubricating action, there is an advantage in that no separate management for lubricating oil is required.

The emergency drive motor 43 rotates the screw shaft 40 to close the car 70 when the power supplied to the drive motor 52 is cut off during an operation of the nut-driven elevator by an emergency situation such as a power failure. Elevate to the height of the platform. The emergency drive motor 43 is constituted by a DC motor, so that the emergency drive motor 43 can operate even in a power failure.

On the other hand, whether the car 70 of the elevator has reached the floor desired by the user is typically sensed by a sensing means such as a sensor, the operation can be controlled, the car 70 by the malfunction of the sensor to the floor desired by the user You can continue to descend even though you have reached it. If the screw nut 50 continues to be driven in the state where the maximum stroke distance of the car 70 is reached, that is, at the lowest height at which the car 70 can descend, the car 70 may not lower any more, and the screw nut There is a risk of causing wear of the 50 and the screw shaft 40 and damage of the screw shaft 40. Therefore, when the screw nut 50 is driven in the direction in which the car 70 descends while the car 70 is located below a predetermined height, the screw shaft 40 rotates by the rotation of the screw nut 50. By being configured to ascend, it is possible to prevent breakage of the screw nut 50 and the screw shaft 40 and to prevent the risk of collapse of the elevator. In other words, when the sensor 70 detects that the screw nut 50 is driven in the direction in which the car 70 descends while the car 70 is positioned below the predetermined height, the emergency drive motor 43 causes the screw shaft ( By releasing the fixing to 40, the screw shaft 40 is rotated and raised by the rotation of the screw nut 50. At this time, the upper portion of the screw shaft 40 is limited only the flow in the lateral direction is not limited to the movement in the vertical direction, the screw shaft 40 can be raised, thereby over-rotating the screw nut 50 This is avoided.

Hereinafter, an operation process of the nut-driven elevator according to the present embodiment will be described with reference to the above-described components. In the following description, the fixing frame 20 is raised when the screw nut 50 is rotated forward, and the fixed frame 20 is lowered when the screw nut 50 is rotated as an example.

First, when the user wants to climb from the ground floor or a specific floor to another floor, the car 70 moves to the floor where the user is located. When the user completes the ride on the car 70 and presses a floor number button to input a desired floor, the driving motor 52 is driven by a controller (not shown) to rotate the screw nut 50 forward. The fixed frame 20 and the car 70 are raised together by the rotation of the screw nut 50, and when the car 70 reaches the input layer, the driving force of the drive motor 52 is cut off, and thus the car 70 is blocked. Stops.

Alternatively, when the user wants to descend from the height of two or more floors of the building 90 to the ground floor or another floor, the car 70 moves to the floor where the user is located. After the user completes the boarding, when the user presses the floor button to input a desired floor, the driving motor 52 is driven by the control unit so that the screw nut 50 rotates backward. The fixed frame 20 and the car 70 are lowered integrally by the rotation of the screw nut 50, and when the car 70 reaches the input layer, the driving force of the drive motor 52 is cut off, and thus the car 70 is cut. Stops.

It will be apparent to those skilled in the art that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. . Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

10 main frame 13: guide rail
20: fixed frame 21: the top plate
22: lower plate 23: shaft insertion groove
31: guide roller 32: auxiliary guide roller
40: screw shaft 50: screw nut
51: driven pulley 52: drive motor
53: drive shaft 54: drive pulley
55: drive belt 60: lubrication
61: lubricant container 62: wick
70: car

Claims (11)

A main frame extending in the vertical direction;
Lifting along the main frame, the car is formed a boarding space therein;
A screw shaft installed between the main frame and the car, extending in parallel with the main frame, and having a screw formed on an outer circumferential surface thereof; And
A drive unit for elevating the car;
/ RTI >
The drive unit,
A fixed frame fixed to a surface of the car that faces the main frame and lifting and lowering integrally with the car;
A screw nut rotatably supported by the fixing frame and having an inner circumferential surface engaged with the screw shaft and rotating in one direction and an opposite direction to raise and lower the fixing frame;
A driven pulley coupled to the screw nut and integrally rotating with the screw nut;
A drive motor providing a driving force for driving the screw nut;
A drive pulley coupled to a drive shaft of the drive motor to rotate by a drive force of the drive motor; And
A drive belt wound around the drive pulley and the driven pulley to transmit a driving force of the drive motor to the screw nut;
Nut driven elevator comprising a. The method of claim 1,
The drive unit,
And a pair of bearings respectively provided at upper and lower ends of the screw nut to rotatably support the screw nut. The method of claim 2,
The screw nut,
And a lubricant storage groove having an inner diameter larger than a diameter of a screw thread of the screw shaft, and having a lubricating oil storage groove formed at a predetermined length along an axial direction at the stop of the screw nut. The method of claim 3,
And a lubrication unit for supplying lubricating oil to the screw shaft. The method of claim 4, wherein
The lubrication unit,
A lubricant container in which lubricant is stored,
A nut-driven elevator comprising a wick, one end of which is immersed in lubricating oil stored in the lubricating oil container, the other end of which is in contact with an outer circumferential surface of the screw shaft. The method of claim 5,
The main frame is provided with a guide rail for guiding the movement path of the car,
The fixed frame is a nut-driven elevator is provided with a guide roller sliding along the guide rail. The method of claim 6,
The guide rails protrude inward from both sides of the main frame,
The guide rollers are provided in pairs at the upper and lower ends of both sides of the fixed frame, the nut-driven elevator sliding along the front and rear of the guide rail. The method of claim 7, wherein
And an emergency drive motor for rotating the screw shaft in an emergency in which power supplied to the drive motor is cut off. The method of claim 8,
The emergency drive motor is a brake-capable DC motor, the nut-driven elevator to prevent the rotation of the screw shaft other than in the emergency. 10. The method of claim 9,
The fixing frame includes a top plate and a bottom plate,
The upper plate and the lower plate is a nut-driven elevator having a planar shape of the 'U' shape open to the car side and having a shaft insertion groove into which the screw shaft is inserted. The method of claim 10,
And the screw shaft is rotated and raised by the rotation of the screw nut when the screw nut is driven in a direction in which the car descends while the car is positioned below a predetermined height.

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