JP2008044713A - Two-way screw type elevator drive mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw type elevator capable of stopping a cage of an elevator in the door opening position on a next floor or the lowermost floor in an emergency to evacuate passengers. <P>SOLUTION: In this invention, two motors are used. One is a screw shaft motor 6 and the other is a nut motor 7. The screw shaft motor 6 is connected to a screw shaft 1, and drives and rotates the screw shaft 1. A nut 3 is rotated with respect to the screw shaft 1 and is vertically moved along the screw shaft 1, and the cage 5 of the elevator is interlocked and is vertically moved along a rail 24. The nut motor 7 is connected to a connection table 4, and interlocks with the nut 3 and rotates it. Thus, the nut 3 is rotated with respect to the screw shaft 1 and is vertically moved along the screw shaft 1, and the cage 5 of the elevator is interlocked and is vertically moved along the rail 24. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a screw-type elevator, and more particularly to a screw-type elevator that allows a passenger to be lowered to the next floor or the lowest floor to open the door of the elevator during a power failure and to easily escape from a cage.

  In the 21st century, the number of silver has increased dramatically due to aging. An aging silver family will have a very difficult life if they do not use elevator facilities instead of going up and down in stages. Therefore, the elevator facility is always useful for the elderly life not only now but also in the future.

  Elevators have already been developed for over 100 years. Looking back on the history of elevators over the last 100 years, there have been mainly four types of design related to the transmission mechanism: screw type, hydraulic type, cable type and linear motor type. A common elevator drive system is a cable-type elevator that moves up and down in conjunction with a cage with a cable.

  However, although the cable type elevator is applied to carry passengers or cargo in a building, it is not appropriate to use a cable type elevator using a traction machine in the case of an elevator for a private house. The problem is that, mainly, the traction machine needs to receive a considerable amount of torque, so the traction machine usually requires a power supply system with a higher output, and a general household power system can load it. It is in a point that cannot be done.

  On the other hand, in order to reduce the output required for the elevator driving system, an elevator driven by a screw is still being developed, but there are still a number of problems as described below.

  FIG. 1 is a front view showing a conventional screw type elevator (see, for example, Patent Document 1). The screw type elevator drive unit 14 rotates the screw 3A in conjunction with each other and moves the elevator cages 4A and 5A in conjunction with the rotation of the screw. However, in the event of a power failure or motor failure, power will be lost, so if there is no brake design, the cage will fall and cause damage to passengers and equipment, and if there is a brake design, It can happen that the passenger stays on the way and is trapped in the elevator.

  FIG. 2 is a three-dimensional view showing another conventional screw type elevator (for example, see Patent Document 2). This screw type elevator can release a brake at the time of a power failure, and can further slowly lower the elevator cage using the centrifugal brake 7 to escape passengers in the cage. However, even if the brake is released at the time of a power failure, there is not enough power to control the drive, so it is difficult to control the speed of the downward movement. If the descent speed is too fast, it will crash. Moreover, since the drive of the power which can be controlled is lacking, it is difficult for the cage to be positioned at an accurate door opening position, and it is not easy for the passenger to open the door himself and leave the elevator cage under normal conditions. You cannot leave the elevator cage without the help of external engineers. Also, if the motor breaks down and becomes stuck and cannot move, the occupant will be trapped on the way if such a conventional design cannot be operated.

Therefore, the design of the screw drive elevator used in the past is the occurrence of damage to the passenger or equipment during a power failure or when the motor fails and power is lost, the cage falls or stops halfway, There are also two major problems, such as the passenger being trapped in the elevator and the brakes being released and lack of drive to control power during a power failure, making it difficult to control the speed of the elevator cage descending. And still cannot be solved at the same time. As such, the design of conventional screw-driven elevators is still expected to be improved because many problems still exist.
JP-A 64-81788 JP 08-26620 A

  The present invention is mainly used for screw type elevators, and is largely divided into that the passenger is confined in the elevator at the time of a power failure or when the screw shaft motor breaks down and that the moving speed of the elevator is difficult to control. The goal is to solve the problem simultaneously.

  To achieve the above objective, the present invention uses two motors. One is a helical shaft motor and the other is a nut motor. The spiral shaft motor is connected to the spiral shaft, drives and rotates the spiral shaft, and the nut rotates relative to the spiral shaft and moves up and down along the spiral shaft. Move up and down. The nut motor is installed on the connection base, and when the nut is rotated in conjunction with the nut, the nut rotates with respect to the spiral axis and moves up and down along the spiral axis. Moved up and down.

  Of the screw shaft motor and nut motor, one of them is a main motor and the other is an emergency motor. Under normal circumstances, the main motor is driven to raise or lower the cage. In the event of a power failure or if the main motor fails, it is driven by an emergency motor with a low output. Since this is a motor that is used only when the emergency motor is abnormal, it is driven by an emergency motor with a small output, and the elevator cage can move downward due to the gravity of the cage.

  Therefore, in the event of a power failure or failure of the main motor, the emergency motor is driven and the elevator is moved to the lower or lowest level door opening position using a small emergency power supply so that the passengers in the cage can Because it is easier to open the door, you can escape from the elevator cage.

  The operation principle of the present invention will be described as follows. A screw assemble is a transmission element that includes a screw shaft and a nut and is designed by applying the principle of relative helical motion that occurs between the attachments. When the spiral shaft and the nut are rotated relative to each other, a relative linear motion is generated between the spiral shaft and the nut.

  Thus, either the helical shaft or the nut can be rotated to change the relative linear position between the helical shaft and the nut, and the helical shaft and the nut can be rotated simultaneously to rotate the helical shaft and the nut. The relative linear displacement that occurs between can be added. At this time, the “relative linear displacement amount” between the helical shaft and the nut is determined by the “relative rotation amount” between the helical shaft and the nut.

  The “relative rotation amount” and “relative linear displacement amount” of the screw device are proportional to each other, and the present invention uses a main motor to rotate the helical shaft or nut in conjunction with each other, Controls the elevator cage up and down in the state. In the event of a power outage or when the main motor fails, the helical shaft and nut will remain helical while still receiving the downward gravity of the cage and passengers or the upward force of the helical shaft on the nut. If the nut does not receive a torque that does not cause the nut to rotate downward, the nut rotates downward. Thus, the present invention is designed to allow the elevator cage to move downward with the aid of the cage weight using an auxiliary motor.

  The auxiliary motor need only have the function of lowering the cage, it is not necessary to drive and raise the elevator cage, and when the cage is lowered, the output of assisting the motor is more than that of the main motor with the help of gravity. It may be much smaller. Also, the output of the emergency motor can be conveniently provided if it is less than 200 watts as an emergency output source.

  The conventional sliding friction type screw device has the disadvantage that the frictional resistance between the helical shaft and the nut is extremely large and the mechanical transmission efficiency is poor. Therefore, the ball screw device can be used as an improved screw device in order to improve the drawback of this poor mechanical transmission efficiency.

  For a better understanding of the features and technical contents of the present invention, reference will now be made in detail to the preferred embodiments and the description of the invention that follows. However, this embodiment or drawing is used merely for explanation or reference, and there is no limitation to the present invention.

  FIG. 3 is a cross-sectional view of an embodiment of the present invention. The upper end of the spiral shaft 1 is attached above the support 2 by the spiral shaft support 21, and the spiral shaft 1 is suspended vertically from the support 2.

  The upper end of the spiral shaft 1 is connected to the spiral shaft motor 6, and the spiral shaft motor 6 is driven to rotate the spiral shaft 1.

  The nut 3 is aligned on the spiral shaft 1 and the space between the nut 3 and the spiral shaft 1 is blended in a spiral manner. When the spiral shaft 1 is rotated without rotating the nut 3, the spiral shaft 1 and the nut 3 A relative linear motion is generated by a relative spiral motion between the two.

  The connecting table 4 is for connecting the elevator cage 5 and the nut 3. When the nut 3 is lifted by interlocking both members without linear displacement, the cage 5 is raised according to the nut 3, and the nut 3 When the vehicle descends, the cage 5 is lowered according to the nut 3, and the cage 5 is for carrying passengers or cargo.

  A rail 24 is vertically installed on a side surface of the cage 5, and the rail 24 is used to guide the movement direction of the cage 6. The movement direction of the cage 6 performs a vertical movement along the vertical direction.

  Further, a nut motor 7 is installed on the coupling base 4, and the main driving gear 22 is fixed to the nut motor 7. The main driving gear 22 is connected to the driven gear 31 on the nut 3, and when the nut motor 7 drives the main driving gear 22 to rotate, the main driving gear 22 rotates in conjunction with the nut 3 via the driven gear.

  The bearing 23 is installed between the nut 3 and the coupling table 4, and the nut 3 and the coupling table 4 can easily rotate with each other.

  In the normal use state, the elevator according to the present invention is conventionally held in a state in which the nut motor 7 does not rotate, and the main driving gear 22, the driven gear 31, and the nut 3 are maintained in a state in which they do not rotate with respect to the connecting base 4. .

  When the helical shaft 1 rotates and the nut 3 does not rotate due to the helical matching characteristics between the helical shaft 1 and the nut 3, a relative linear motion occurs between the helical shaft 1 and the nut 3. Normally, in a state where the nut motor 7 is maintained and does not rotate, the helical shaft motor 6 is controlled to rotate in the forward and reverse directions, so that the nut 3 is controlled to move relative to the ground along the rail 24 together with the elevator cage 5. Move up and down.

  When the helical shaft 1 is rotated relative to the nut 3, the linear moving speed of the helical shaft 1 relative to the nut 3 is determined by the screw stroke (linear displacement that occurs at each rotation of the screw) and the rotation of the helical shaft 1 relative to the nut 3. Since it is related to the speed, it is necessary to control the rotational speed of the helical shaft by designing an appropriate stroke in order to control the vertical movement speed of the elevator cage 5. When the helical shaft 1 rotates and drives and raises the cage, the helical shaft motor 6 provides an output for overcoming the frictional resistance force and further increases the potential energy of gravity to the cage 5. Because it is necessary to provide sufficient energy, a higher output of the motor is required.

  However, conversely, when the cage 5 is moved downward, the direction of gravity and frictional resistance of the cage 5 is opposite to each other, so that the frictional resistance can be overcome by gravity, and the helical shaft motor 6 Does not require a large output to drive the helical shaft 1 and lower the cage 5.

  For a normal motor, the difference in rotational output between the forward and reverse directions of the motor is not clear, but in order to prevent the vertical movement speed of the cage 5 from becoming too slow, the output of the motor used is usually 1 HP. The above is necessary. However, in order to provide such a large output by an emergency power source when a city power failure occurs, the emergency power source becomes large and the size of the necessary power source becomes considerably large, leading to high equipment costs.

  The nut motor 7 of the present application is an emergency power source whose output is much smaller than that of the helical shaft motor 6, and the nut motor 7 is kept in a non-rotating state in order for the elevator to operate normally. The nut motor 7 uses a reduction motor to reduce the output rotation speed of the motor, and when the motor is not driven automatically, the motor cannot be rotated unless there is a very large torque output at the output end of the motor. Further, the larger the reduction ratio, the larger the torque, and the nut motor 7 is easily kept from rotating.

  Considering the danger of driving, a case where a brake reduction motor is used as the nut motor 7 may be considered.

  When the helical shaft motor 6 fails and cannot operate normally, or when the city electricity fails to supply sufficient power to the helical shaft motor 6 and the helical shaft motor 6 cannot rotate, the emergency power is supplied from the nut motor 7. The nut motor 7 can drive and rotate the main driving gear 22, and the nut 3 can be rotated relative to the helical shaft 1 via the driven gear 31 to move downward. The downward movement of the cage 5 does not require a very large pressing force, so the nut motor 7 need only have a small output (200 watts or less, corresponding to the power of two 100-watt light bulbs). For this reason, it is sufficient for the emergency power source to have a small storage battery.

  Therefore, when the cage 5 is abnormal in operation, it stops between the two floors, and when the occupant is trapped in the elevator cage, the present invention uses the emergency power source to match the small nut motor and It can be rotated and driven downward, and the cage 5 is lowered to the lower level or the lowest level door opening position so that passengers in the cage 5 can easily open the cage door and leave the cage 5 of the elevator. Can do.

  Due to the relative motion characteristics between the helical shaft 1 and the nut 3, the vertical movement of the cage 5 can be interlocked by the rotation of either the helical shaft 1 or the nut 3. Therefore, the nut motor 7 having a larger output can be used. Under normal use, the cage 5 is moved up and down in conjunction with the nut motor 7. When the power failure or the nut motor 7 fails, the helical shaft motor 6 having a smaller output is driven to the emergency power source to move the cage 5 and lower the cage 5 to the lower or lowest level door opening position. Can do.

  4 is a cross-sectional view taken along line AA in FIG. As shown in the figure, the relationship between the main driving gear 22 and the driven gear is such that when the main driving gear 22 rotates, the driven gear 31 rotates in conjunction with it. Further, since the driven gear 31 is fixed on the nut 3, the nut 3 is rotated by the rotation of the driven gear 31, and the nut 3 is controlled to move up and down along the spiral shaft 1. The nut 3 can rotate with respect to the helical shaft 1.

  In general, since both motors are used, one of them is that the helical shaft motor moves up and down in conjunction with the cage when the helical shaft motor is in normal use. The other one is that the nut motor drives the nut to rotate the helical shaft relatively and moves it downward, and moves the elevator cage in conjunction with it downward. The cage is stopped between the two floors in the event of an abnormality, and when the passenger is trapped in the elevator cage, the present invention uses an emergency power supply to match the small nut motor and rotate the nut downward, The passenger in the cage can open the cage and leave the cage of the elevator after the door is lowered to the door opening position of the lower level or the lowest level.

  Further, by combining the small nut motor using the emergency power supply, the elevator can control the moving speed in the downward direction, and the cage can be easily positioned to the door opening position. Through the two-way screw-type elevator drive mechanism devised by the present application, when a power failure or a helical shaft motor breaks down, people are confined in the elevator and simultaneously solve two major problems that make it difficult to control the descending speed of the elevator it can.

  Therefore, the present invention not only has a certain creativity in spatial form, but also can increase the above-mentioned high cost over the prior art, so that the present invention is of “novelty” and “inventive step”. I am fully prepared for the requirements of the patented invention, so I hope that it will be granted early through examination by filing as a patented invention by law.

Sectional drawing which shows the conventional screw type elevator. The perspective view which shows the other conventional screw type elevator. Sectional drawing which shows the Example of this invention. Sectional drawing along the AA line of FIG.

Explanation of symbols

<Conventional technology>
14 Drive 3A Screw 4A, 5A Elevator cage 7 Centrifugal brake <Invention>
DESCRIPTION OF SYMBOLS 1 Screw shaft 2 Support tool 21 Spiral shaft support stand 22 Main drive gear 23 Bearing 24 Rail 31 Driven gear 3 Nut 4 Connecting stand 5 Cage 6 Spiral shaft motor 7 Nut motor

Claims (5)

A support,
A helical shaft that is vertically and rotatably mounted on the support;
A nut screwed on the helical shaft;
A cage for loading passengers or cargo;
A connecting base for connecting the cage and nut and interlocking the two;
A rail vertically installed on the side surface of the cage, for guiding the movement direction of the cage and vertically moving in the vertical direction;
Connected to the spiral shaft, drives and rotates the spiral shaft, the nut rotates relative to the spiral shaft, moves up and down along the spiral axis, and simultaneously moves the cage up and down along the rail A helical shaft motor;
A nut motor that is installed on the coupling base, rotates the nut in conjunction with the nut, and moves the nut up and down along the spiral axis simultaneously with the rotation of the spiral shaft, and at the same time moves the cage up and down along the rail. And a two-way screw type elevator drive mechanism.   The helical shaft motor is a main motor, and the cage is driven to move up and down in a normal state. The nut motor is an emergency motor, the output is smaller than that of the main motor, and the main motor cannot drive the vertical movement of the cage. The two-way screw type elevator drive mechanism according to claim 1, wherein the cage is driven to move downward.   The nut motor is a main motor, and the cage is driven to move up and down in a normal state, and the helical shaft motor is an emergency motor, the output is smaller than that of the main motor, and the main motor cannot drive the vertical movement of the cage. The two-way screw type elevator drive mechanism according to claim 1, wherein the cage is driven to move downward.   The two-way screw type elevator drive mechanism according to any one of claims 1 to 3, wherein the screw is a ball screw that improves mechanical transmission efficiency.   4. The two-way screw type elevator drive mechanism according to claim 2, wherein the output of the emergency motor is smaller than 200 watts, which is convenient for providing an emergency power source.

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