JP2002068618A - Load detecting device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the load in a cage with high accuracy in every situation. SOLUTION: A piezoelectric element 30 outputting a signal corresponding to the load in the cage 28 is mounted between the cage 28 and a car frame 27 supporting the cage 28, and the load in the cage 28 is operated by an arithmetic unit 31 on the basis of the signal from the piezoelectric element 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator load detecting device for detecting a load in a car room.

[0002]

2. Description of the Related Art Conventionally, as a load detecting device for detecting a load in a car room, a type using a contact switch and a type using a pressure sensor are known. In the type using a contact switch, for example, as shown in Japanese Patent Application Laid-Open No. 60-93073, by using a plurality of contact switches having different operating points depending on the load capacity, the load in the car room is detected stepwise. You.

FIG. 5 shows, for example, Japanese Patent Application Laid-Open No. Hei 6-12785.
FIG. 7 is a configuration diagram showing a conventional hydraulic elevator disclosed in Japanese Patent Application Publication No. 7-1995, in which a type load detection device using a pressure sensor is provided. In the figure, a hydraulic jack 1 has a cylinder 2 filled with pressure oil and a plunger 3 whose lower end is inserted into the cylinder 2 and supported by the pressure oil.

At the upper end of the plunger 3, a rotatable deflecting wheel 4 is provided. The car 5 is moved up and down in the hoistway by the vertical movement of the deflecting wheel 4. The main rope 6 has an intermediate portion wound around the deflecting wheel 4, one end of which is connected to the car 5, and the other end of which is connected to the pit 7 in the hoistway.

[0005] An oil tank 10 is connected to the cylinder 2 via an electromagnetic switching valve 8 and a hydraulic pump 9. The electromagnetic switching valve 8 always functions as a check valve, and is switched by energizing the electromagnetic coil to conduct oil in the opposite direction. The hydraulic pump 9 is driven by applying a torque by a three-phase induction motor 11.

The three-phase induction motor 11 is driven by an inverter 12. The rotation speed of the three-phase induction motor 11 is detected by the speed detector 13. Speed detector 13
Outputs a voltage proportional to the rotation speed of the three-phase induction motor 11. The signal from the speed detector 13 is transmitted to the speed controller 14
Is input to The inverter 12 is controlled by a speed control device 14.

The electromagnetic switching valve 8 is controlled by an electromagnetic valve control device 15. The solenoid valve control device 15 includes the speed control device 1
4. A pressure sensor 16 is provided between the electromagnetic switching valve 8 and the cylinder 2. Pressure sensor 1
The output from 6 is input to the arithmetic unit 17. The load detection device has a pressure sensor 16 and a calculation device 17.

Next, the operation will be described. First, at the time of initial adjustment of the elevator, the car 5 is set in a no-load state, and the output Pn1 from the pressure sensor 16 in that state is calculated by the arithmetic unit 1
7 is stored. Thereafter, the rated load Wf1 is placed in the car 5.
(Kg) is loaded, and the output Pf1 from the pressure sensor 16 in that state is stored in the arithmetic unit 17.

During normal operation, the load Wx is obtained from the output Px of the pressure sensor 16 obtained when the load Wx (kg) is loaded while the car 5 is stopped, by the equation Wx = ｛(P
x-Pn1) / (Pf1-Pn1)｝ × Wf1.

[0010]

Among the above-described conventional load detection devices for elevators, in the type using a contact switch, the contact switch is mounted under the floor of the cab, so that the space is limited. In addition, the operating point of the contact switch varies depending on the position of the load (passenger or the like) in the car cabin, and the load is detected only stepwise, resulting in low accuracy.

On the other hand, in the type using the pressure sensor 16, although the load can be continuously calculated, there is a limitation that it can be applied only to the hydraulic elevator. Also, due to the characteristics of the hydraulic jack 1, the pressure after the ascent operation tends to be higher than the pressure when the jack is left for a long time. This is because the packing portion (not shown) of the hydraulic jack 1 is made of rubber or the like, and the pressure during traveling is maintained. For this reason, the load detection device of the type using the pressure sensor 16 has a disadvantage that the load detection value after the ascending travel becomes higher than the actual value.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an elevator load detecting device capable of accurately detecting a load in a cab in any state. With the goal.

[0013]

According to a first aspect of the present invention, there is provided an elevator load detecting apparatus for outputting a signal corresponding to a load in a car room, and detecting a load in the car room by a signal from the piezoelectric element. It is provided with a calculation device for performing calculation.

According to a second aspect of the present invention, there is provided an elevator load detecting device in which a piezoelectric element is disposed between a cab and a car frame supporting the cab.

According to a third aspect of the present invention, there is provided an elevator load detecting device in which a piezoelectric element is arranged between a car frame for supporting a car room and a rope shackle for connecting a main rope to the car frame. is there.

According to a fourth aspect of the present invention, there is provided an elevator load detecting device, comprising: a hydraulic jack, a deflecting car provided on the hydraulic jack and moved up and down by the hydraulic jack, a car frame, and a car supported by the car frame. A car having a room, a car that is raised and lowered by the vertical movement of the deflector car, and a main rope that has an intermediate part wound around the deflector car, one end of which is connected to the car frame and the other end of which is connected to the hoistway A piezoelectric element that is provided in a hydraulic elevator that is provided between a hydraulic jack and a deflector car and outputs a signal corresponding to a load in a car room, and a car that is driven by a signal from the piezoelectric element. It is provided with a calculation device for calculating the indoor load.

An elevator load detecting apparatus according to a fifth aspect of the present invention uses a film-shaped piezoelectric element.

According to a sixth aspect of the present invention, there is provided an elevator load detecting device for comparing an initial load which is a load in a car room immediately after a door of a car is closed with a running load which is a load while the car is running. When the difference between the running load and the initial load becomes equal to or greater than a preset value, an arithmetic unit that outputs a signal for stopping the car to the nearest floor is used.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a configuration diagram showing an elevator load detection device according to Embodiment 1 of the present invention. In the figure, a hydraulic jack 22 is installed in a hoistway 21. The hydraulic jack 22 has a cylinder 23 and a plunger 24. At the upper end of the plunger 24, a rotatable baffle 25 is provided.

The car 26 comprises a car frame 27 and a car frame 2
And a cab 28 supported by the cab 7. Also,
The car 26 is guided by the guide rail 29 and is driven by the hoistway 21.
It is raised and lowered inside. Between the car frame 27 and the cab 28,
A plurality of piezoelectric elements 30 for outputting a signal according to the load in the car room 28 are interposed. The signal from the piezoelectric element 30 is sent to the arithmetic unit 31. The arithmetic unit 31 calculates the load in the car room 28 based on a signal from the piezoelectric element 30.

The main rope 32 has an intermediate portion wound around the deflecting wheel 25. One end of the main cable 32 is connected to the car frame 27 via a rope shackle 33. Main rope 32
Is connected to a fixed device in the hoistway 21.

Next, the operation will be described. First, at the time of the initial adjustment of the elevator, the cab 28 is in a no-load state,
The output εn1 from the piezoelectric element 30 in that state is stored in the arithmetic unit 31. After this, the rated load W
f1 (kg) is loaded, and the output εf1 from the piezoelectric element 30 in that state is stored in the arithmetic unit 31.

During normal operation, the load Wx is obtained from the output εx of the piezoelectric element 30 obtained when the load Wx (kg) is loaded while the car 26 is stopped, according to the equation Wx = ｛(ε
x−εn1) / (εf1−εn1)｝ × Wf1.

FIG. 2 is a flowchart showing an example of an elevator control method by the arithmetic unit 31 of FIG. First, when the door is closed (step S1), an initial load is detected based on the output from the piezoelectric element 30 at that time (step S2). Thereafter, when the car 26 starts running (step S3), a running load, which is a running load of the car 26, is detected (step S4). Then, it is monitored whether or not the difference between the initial load and the running load is less than a preset value (step S5).

If the difference between the initial load and the running load is less than the set value, the normal running is continued (step S6). If the value is equal to or greater than the set value, the car 26 is emergency stopped (step S7). Thereafter, the car 26 travels at a low speed to the nearest floor and is stopped (step S8), and the door is opened (step S9).

In such a load detecting device, the piezoelectric element 3
Since the load in the cab 28 is detected using 0, the load in the cab 28 is not affected by the position of the load in the cab 28 or the pressure holding characteristic of the hydraulic jack 22 and the load in the cab 28 is detected in any state. The detection can be continuously performed with high accuracy. Further, for example, by using the film-shaped piezoelectric element 30, the load detecting device can be configured inexpensively and compactly.

The arithmetic unit 31 compares the initial load with the running load, and when the difference is equal to or greater than a set value, the car 26
Is output to the nearest floor, so that the car 26 can be safely guided to the nearest floor in response to dangerous actions such as swinging the car during traveling.

Although the hydraulic elevator has been described in the first embodiment, the load detecting device of the present invention can be applied to an electric elevator.

Embodiment 2 In the first embodiment,
Although the piezoelectric element 30 is arranged between the car frame 27 and the car room 28, the piezoelectric element 30 may be arranged between the car frame 27 and the rope shackle 33, for example, as shown in FIG.

Embodiment 3 Further, although limited to a hydraulic elevator, for example, as shown in FIG.
The piezoelectric element 30 may be arranged between the deflecting wheel 2 and the deflecting wheel 25.

[0031]

As described above, the elevator load detecting device according to the first aspect of the present invention outputs a signal according to the load in the car room by the piezoelectric element, and the signal from the piezoelectric element outputs the signal to the car by the arithmetic unit. Since the load in the room is calculated, the load in the car room can be accurately detected in any state.

In the elevator load detecting device according to the second aspect of the present invention, since the piezoelectric element is arranged between the cab and the car frame supporting the cab, the load in the cab can be accurately determined for all types of elevators. It can be detected well.

In the elevator load detecting device according to the third aspect of the present invention, the piezoelectric element is arranged between the car frame supporting the car room and the rope shackle for connecting the main rope to the car frame. With respect to the type of elevator, the load in the cab can be accurately detected.

According to a fourth aspect of the present invention, there is provided an elevator load detecting device, wherein a piezoelectric element for outputting a signal corresponding to a load in a car cabin is arranged between a hydraulic jack and a deflecting vehicle, and an arithmetic unit is operated by a signal from the piezoelectric element. Since the load in the cab is calculated, the load in the cab can be accurately detected in any state of the hydraulic elevator.

Since the elevator load detecting device according to the fifth aspect of the present invention uses a film-shaped piezoelectric element, the load detecting device can be configured inexpensively and compactly.

The elevator load detecting device according to the present invention compares the initial load, which is the load in the car room immediately after the door of the car is closed, with the running load, which is the load while the car is running. When the difference between the running load and the initial load is equal to or greater than a preset value, a dangerous device such as a swinging car during running is used because an arithmetic unit that outputs a signal for stopping the car at the nearest floor is used. In contrast, the car can be safely guided to the nearest floor.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an elevator load detection device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an example of an elevator control method by the arithmetic device of FIG. 1;

FIG. 3 is a configuration diagram illustrating an elevator load detection device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing an elevator load detection device according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram illustrating an example of a conventional hydraulic elevator.

[Explanation of symbols]

22 hydraulic jacks, 25 deflectors, 26 baskets, 2
7 car frame, 28 car room, 30 piezoelectric element, 31 arithmetic unit, 32 main rope, 33 rope shackle.

Claims (6)

[Claims] 1. An elevator load detection system comprising: a piezoelectric element for outputting a signal corresponding to a load in a cab; and a calculation device for calculating a load in the cab based on a signal from the piezoelectric element. apparatus. 2. The elevator load detecting device according to claim 1, wherein the piezoelectric element is disposed between the cab and a car frame supporting the cab. 3. The elevator according to claim 1, wherein the piezoelectric element is disposed between a car frame that supports the car room and a rope shackle for connecting a main rope to the car frame. Load detector. 4. A hydraulic jack, a deflecting vehicle provided on the hydraulic jack and moved up and down by the hydraulic jack, a car frame and a cab supported by the car frame. The car is lifted and lowered, and the middle part is wound around the deflector wheel, one end is provided in the car frame, and the other end is provided in a hydraulic elevator having a main rope connected to the hoistway. A load detecting device for an elevator, comprising: a piezoelectric element disposed between the hydraulic jack and the deflector vehicle, for outputting a signal corresponding to a load in the car room; A load detecting device for an elevator, comprising a calculating device for calculating the load of the elevator. 5. The elevator load detecting device according to claim 1, wherein a film-shaped piezoelectric element is used. 6. The arithmetic unit compares an initial load, which is a load in the car room immediately after the door of the car is closed, with a running load, which is a load while the car is running. The elevator load according to any one of claims 1 to 5, wherein when the difference from the initial load is equal to or greater than a preset value, a signal for stopping the car to the nearest floor is output. Detection device.