JP2001294382A - Pneumatic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic elevator measuring weight of a car when the car starts lowering and controlling discharge of air from an air bag according to the car weight before the car lands on a floor so as to carry out landing of the car smoothly. SOLUTION: When air in the air bag 2 is discharged and the car 3 is lowered, an internal pressure of the air bag 2 in the start of lowering of the car 3 is detected by means of a pressure sensor 10, and on the basis of the detection result of the pressure sensor 10, the weight of the car 3 is measured. Subsequently, in compliance with the weight of the car 3, an air discharging valve 11 is controlled for regulating an air discharging amount of the air bag 2 before landing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic elevator, and more particularly to a pneumatic elevator method for sensing the weight of the entire car including a load when the car descends so that the car can smoothly land on the floor.

[0002]

2. Description of the Related Art In general, a pneumatic elevator is configured to push up a car by sending air into an airbag disposed under the car and inflating the airbag, to release the air in the airbag, and to release the air in the airbag. It is formed so that the car can be lowered by contracting it. When the car is lowered, it is only necessary to discharge the air in the airbag. Is being adjusted.

[0003] In a conventional elevator, a sensor is provided before the car reaches the floor for smooth landing, and an exhaust pipe is narrowed when the car passes through the sensor to reduce the amount of air exhausted. The speed of descent is reduced to achieve a smooth landing.

[0004]

However, as described above, the amount of exhaust gas is limited when passing through the sensor, so that even if there is a difference in the weight of the car or a difference in the speed of the car due to the difference, the same throttle is always used. Therefore, when the basket is heavy or the speed is fast, smooth landing is not possible.On the other hand, when the basket is light or the speed is slow, it slows down more than necessary and it takes time to land. was there.

The present invention solves the above-mentioned problems, measures the weight of a car when the car starts descending, and controls the exhaust of the airbag in accordance with the weight of the car before the car arrives on the floor to control the car. It is an object of the present invention to provide a pneumatic elevator capable of smoothly landing on a floor.

[0006]

In order to solve the above-mentioned problems, a pneumatic elevator according to the present invention comprises: an airbag having an airbag body vertically stacked and arranged to expand and contract in the vertical direction; And a blower that supplies air into the airbag and raises the basket, a pressure sensor that detects the internal pressure of the airbag, and an airbag that exhausts air from the airbag. In a pneumatic elevator equipped with an exhaust valve for lowering the car, when exhausting air from the airbag and lowering the car, the pressure sensor detects the internal pressure of the airbag at the start of lowering the car, The weight of the car is measured based on the detection result of the pressure sensor, and the exhaust valve is controlled in accordance with the weight of the car to adjust the exhaust amount of the airbag before landing. It is characterized in.

[0007]

FIG. 1 is a schematic perspective view of a pneumatic elevator (hereinafter, referred to as an elevator) according to the present invention, and FIG. 2 is a block diagram. In this elevator, an elevator airbag 2 is provided on an upper surface of a base frame 1, and an elevator car 3 is arranged on the airbag 2. The cage 3 is adapted to move up and down along columns 4 set at four corners of the base frame 1 by inflating or deflating the airbag 2, and supplies air to the airbag 2. A blower 5 is connected via a line 6.

[0008] The basket 3 is a box that carries people and luggage and moves on the floor, and along a support 4 erected on the base frame 1,
The cage 3 is pushed up by the airbag 2 until it hits the stopper 7 when it rises, and the position detection sensor 8 can detect that the landing is near when it descends. Has become.

The airbag 2 has a configuration in which a bag-shaped airbag body 2a is vertically stacked in multiple stages, and adjacent airbag bodies 2a communicate with each other through communication holes (not shown) formed in the respective airbag bodies. Since the inside of each airbag body 2a is connected to each other by the respective communication holes, the airbag 2 is inflated by sending air to the lowermost airbag body 2a by the blower 5. Has become.

The blower 5 is a blower driven by the electric motor 9 and is connected to the airbag 2 through a pipe 6.
By rotating the airbag, air can be supplied to the airbag 2 via the pipeline 6.

The position detecting sensor 8 comprises a photoelectric switch such as a photo sensor, a magnetic switch such as a reed switch, a mechanical micro switch, and the like.
It is to detect that approaching.

A pressure sensor 10 composed of a pressure gauge for detecting the internal pressure of the airbag 2 and an exhaust valve 11 are provided in the middle of the pipe 6, and the detection result of the pressure gauge is input to a control unit (not shown). The controller calculates the weight of the car 3 based on the detection value of the pressure sensor 10 and controls the throttle amount of the exhaust valve 11 according to the weight of the car 3.

According to the elevator having the above configuration, the elevator is operated by operating a switch for the second floor (not shown) while the car 3 is stopped on the first floor. When the electric motor 9 rotates, the blower 5 operates, and air is sent into the airbag 2 via the pipe 6, so that the airbag 2 expands and pushes the cage 3 upward.

Even after the car 3 comes into contact with the stopper 7, the electric motor 9 is rotated until the internal pressure of the airbag 2 reaches a predetermined value Ps. Stop supplying.

Next, when the user goes down from the second floor to the first floor, he operates the switch for the first floor, and the exhaust valve 11 is operated.
Opens to reduce the internal pressure of the airbag 2. When the internal pressure of the airbag 2 decreases, the cage 3 starts lowering. When the lowering starts, the internal pressure of the airbag 2 starts lowering as shown in the graph of the airbag pressure versus time in FIG. From the difference between the rate of change of the internal pressure of the airbag 2 in the unit time up to and the rate of change of the internal pressure of the airbag 2 in the descending unit time, it is possible to determine the timing to start lowering, and It has been found that the internal pressure at the start of the descent differs depending on the magnitude of the weight. When the weight is large, the descent is started at a high pressure P1, and when the weight is small, the descent is started at a low P2.

The weight of the cage 3 can be calculated from the pressure value detected by the pressure gauge when the descent is started. Since the weight is the product of the pressure and the area, the weight can be calculated from the product of the pressure and the area if the area where the top surface of the airbag 2 contacts the bottom surface of the cage 3 is known in advance. .

The controller calculates the weight of the car 3 (the sum of the weight of the car itself and the weight of the load) at the start of the lowering of the car 3,
When the position detection sensor 8 detects the car 3 (detection time T
1, T2), the throttle amount of the exhaust valve 11 is adjusted according to the weight of the cage 3, and when the weight is large, the throttle amount is increased,
When the weight is small, the amount of squeezing can be reduced, and a smooth landing can be performed regardless of the size of the weight.

In the above-described elevator, the case where the elevator reciprocates between the first floor and the second floor has been described. However, when the elevator is installed in a three-story building, the position detection sensor 8 is provided also on the second floor.
When descending from the third floor and stopping at the second floor, the weight of the car is measured when starting to descend from the third floor, and when the position detection sensor on the second floor detects the car, the amount of throttle of the exhaust valve is adjusted. Good. If the switch for the second floor is not pressed when descending from the third floor, the detection signal of the position detection sensor on the second floor is, of course, ignored.

In the above-described elevator, when the car 3 descends, the exhaust valve 11 is adjusted so that the landing is smooth. However, a second position detecting sensor 8 'is provided near the stopper 7 to provide a car. The weight of the car 3 is also measured when the car 3 is ascending apart from when the car 3 is lowered. When the second position detection sensor 8 'detects that the car 3 is raised, the rotation speed of the electric motor 9 is reduced to reduce the air supply amount. At least, the car 3 may smoothly contact the stopper 7. This allows
Even when the car 3 is raised, the car 3 can be stopped smoothly.

[0020]

According to the present invention, it is not necessary to separately provide a measuring device for measuring the weight of the car, and the weight of the car is determined by using the pressure sensor for monitoring the internal pressure of the airbag.
By adjusting the throttle amount of the exhaust valve based on the determined result, it is possible to perform deceleration corresponding to the weight of the car (the sum of the car itself and the load), and it is possible to smooth the landing of the car, A comfortable ride elevator can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pneumatic elevator according to the present invention.

FIG. 2 is a configuration diagram of the pneumatic elevator.

FIG. 3 is a graph of airbag pressure versus time for explaining changes in the internal pressure of the airbag when the car descends.

[Explanation of symbols]

 2 airbag 2a airbag body 3 basket 5 blower 10 pressure sensor 11 exhaust valve

Claims (1)

[Claims] 1. An airbag arranged so that an airbag body is vertically overlapped and expanded and contracted in an up-down direction, a basket arranged on the airbag, and supplying air into the airbag, In a pneumatic elevator including a blower for raising a car, a pressure sensor for detecting an internal pressure of the airbag, and an exhaust valve for exhausting air in the airbag and lowering the car, When exhausting the car and lowering the car, the internal pressure of the airbag at the start of the lowering of the car is detected by the pressure sensor, and the weight of the car is measured based on the detection result of the pressure sensor. A pneumatic elevator wherein the exhaust valve is controlled according to the weight to adjust the exhaust amount of the airbag before landing.