JPS6153989B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator position detection device for detecting the position of an elevator car.

Detection of car position is essential for elevator operation, and elevators are always provided with a car position detection device. There are various methods for detecting the car position, but in recent years, methods have been adopted in which this is performed using electronic computer calculations. This is shown in FIG.

In this figure, 1A and 1B are installed on the first and second floors, respectively, and 2A is installed in the hoistway.
This is a cam placed between the first floor 1A and the second floor 1B. Further, 3 indicates a car, and a floor detector 4 consisting of a switch is attached to this car 3. The floor detector 4 is operated by the cam 2A to detect the floor, and is configured to send its detection signal to the converter 5.

The converter 5 is for converting the signal from the interfloor detector 4 to computer information into computer information, and this output is sent to the central processing unit (hereinafter referred to as CPU) 6 of the computer. It's getting old. The car position calculated by the CPU 6 is transferred to the floor memory 7. This floor memory 7 is readable and writable.

FIG. 2 is a diagram showing the operation of the car position detection device shown in FIG. In this figure 2, 1C is the third floor, and 2B is the second floor, floor 1B, and the third floor, floor 1.
This is a cam placed between C and C. Further, 8 is an operation line of the car 3, and 9 is a car position signal stored in the floor memory 7. Other than the above, the configuration is the same as in FIG. 1.

Now, when car 3 is on floor 1A of the 1st floor, the floor memory 7 has "1" (actually, it is calculated and stored in binary numbers, but for simplicity, it is expressed in decimal numbers. similar) are memorized. When the car 3 rises and the floor detector 4 enters the cam 2A, the floor detector 4 generates an output that is transmitted through the transducer 5.
It is taken into CPU6.

The CPU 6 adds "1" to the value in the floor memory 7 based on the output of the inter-floor detector 4 and the traveling direction of the car 3, and updates the value to "2". Furthermore, basket 3
rises and the inter-floor detector 4 enters the cam 2B, "1" is further added to the value in the floor memory 7, and the value is updated to "3".

Also, when car 3 descends from 3rd floor 1C,
When the floor detector 4 enters the cam 2B, "1" is subtracted from the value "3" in the floor memory 7, and the value is updated to "2". Furthermore, when the car "3" descends and the floor detector 4 enters the cam 2A, "1" is further subtracted from the value in the floor memory 7, and the value is updated to "1".

In this way, the value in the floor memory 7, ie, the car position signal 9, changes in synchronization with the actual car position.

However, during normal elevator operation, car 3 always stops at each floor, but in the case of manual operation during maintenance, a power outage, or an emergency stop when a safety device is activated,
Car 3 may stop in the middle of a floor.

In this case, depending on the stop position of the car 3, a problem occurs in that the car position signal 9 deviates significantly from the actual car position.

This will be explained with reference to FIG. In this Figure 3, 1D and 1E are the 4th and 5th floors, respectively.
2C and 2D are cams placed between the 3rd floor 1C and the 4th floor 1D, and the 4th floor 1D and the 5th floor 1E, respectively.
Other than the above, it is the same as in FIG. 2.

When the car 3 is on the first floor floor 1A, the value of the floor memory 7 is "1". Now, basket 3
Car 3 operates upward, and when a stop command is issued from an elevator control device (not shown) at time _t0 , car 3 decelerates and stops.

In the case of a manual operation stop or an emergency stop, the car 3 is normally stopped by a mechanical brake (not shown), so vibrations occur in the car 3 when stopped. Therefore, as shown in FIG. 3, when the car 3 stops at a position where the inter-floor detector 4 faces the lower end of the cam 2A, the inter-floor detector 4 is Repeats entering and leaving cam 2A.

However, during ascending operation, each time the floor detector 4 enters the cam, "1" is added to the value in the floor memory 7, so as shown in FIG. The vibration causes the separation and entry from cam 2A to 3.
When repeated several times, the value of floor memory 7 will contain a total of "4".
is added, and the value becomes "5".

Therefore, when the car 3 moves up again and reaches the second floor 1B, the car position signal 9 will be at the fifth floor, which will deviate significantly from the actual car position.

This invention was made to solve the above problem, and even when the car stops between floors,
An object of the present invention is to provide an elevator position detection device that can minimize the deviation between a car position signal and an actual car position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the elevator position detection device of the present invention will be described below with reference to the drawings. When the configuration of the present invention is shown in a block diagram, it is similar to the conventional elevator position detection device shown in FIG. 1, and FIG. 1 will be referred to in the following description. However, since the block diagram is the same as that in FIG. 1 regarding the configuration, a description of the configuration of the block diagram in FIG. 1 will be omitted here.

FIG. 4 is a flowchart for explaining the operation of the elevator position detection device of the present invention.
According to the flowchart of FIG. 4, after the elevator stop command is issued, even if the interfloor detector repeatedly approaches the cam 2A, the value in the floor memory is updated only at the first cam approach.

FIG. 5 shows the operation of the car position detection device which performs the calculations shown in the flowchart of FIG. In FIG. 5, the symbols are the same as in FIG. 3.

Now, when the car 3 is on the first floor, the value of the floor memory 7 is "1". Now, car 3 is in upward operation, and when a stop command is issued from the elevator control device at time _t0 , car 3 decelerates to a stop. At this time, the car 3 vibrates and the floor detector 4 detects the cam 2A.
Even if you repeatedly enter and leave the floor, the value in floor memory 7 will only be incremented by ``1'' when you first enter, and 2.
The value in the floor memory 7 is not updated during the subsequent entry.

Therefore, the value of the floor memory 7 maintains "2", and when the car 3 moves up again and reaches the second floor 1B, the car position signal 9 is set to the second floor, indicating the actual car position. exactly.

In addition, for elevators with a rated speed of 105 m/min or less, even if an emergency stop occurs while running at the rated speed, the distance traveled from the time a stop command is issued to the complete stop is less than the minimum floor distance (usually 3 m or more). The floor detector 4 does not enter two different cams (for example, 2B and 2C) from when a stop command is issued until the vehicle stops. Therefore, no problem will occur even if the value of the floor memory 7 is updated only once after a stop command is issued, as shown in the flowchart of FIG.

In addition, when the car 3 is stopped, if the floor detector 4 repeatedly enters and leaves the cam 2 and finally stops in the detached state, when the car 3 starts to operate upward again,
The floor detector 4 enters the cam 2A again, and "1" is further added to the value in the floor memory 7, making the value "3".

Therefore, when car 3 reaches 2nd floor 1B, car position signal 9 is on the 3rd floor, and although it deviates from the actual car position by one floor, it does not deviate significantly as shown in Figure 3. .

In the embodiment shown in FIG. 4, a case has been described in which the value of the floor memory 7 is updated when the inter-floor detector 4 enters the cam 2A.
The same applies to the case where the value of the floor memory 7 is updated when leaving A, the value of the floor memory is updated when entering the cam 2A during ascending operation, and when leaving the cam 2A during descending operation. It is clear that the effect is obtained.

As detailed above, according to the elevator position detection device of the present invention, the calculation of the car position signal can be performed by
After a stop command is issued, the operation is limited to one time only, and even if an emergency stop is made while running at the rated speed, the distance traveled from the time the stop command is issued until the elevator stops is less than the minimum distance between floors. Since the calculation is limited, even if the car stops between floors and the interfloor detector repeatedly enters and leaves the cam due to car vibration, the car position signal will be significantly different from the actual car position. It is possible to prevent it from shifting.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of an elevator position detection device according to the prior art and the present invention;
2 and 3 are diagrams for explaining the operation of a conventional elevator position detection device, and FIG. 4 is a flowchart showing the operation flow of an embodiment of the elevator position detection device of the present invention, Figure 5 is the 4th
FIG. 2 is an explanatory diagram of the operation of the elevator position detection device of the present invention, which performs calculations according to the flowchart shown in the figure. 1A...1st floor, 1B...2nd floor, 1
C...3rd floor, 1D...4th floor, 1E...
...5th floor, 2A...cam, 3...basket, 4...
...Inter-floor detector, 5...Converter, 6...Central processing unit, 7...Floor memory. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. Even if an emergency stop is made while traveling at the rated speed, the distance from the stop command until the stop operation is shorter than the minimum distance between floors is provided in an elevator, and the elevator is provided between floors. In an elevator position detection device that detects the position of the car by adding or subtracting the first floor using an electronic computer when the car passes the inter-floor detector and generates a car position signal, the elevator stops with respect to the car. means for detecting that a command has been issued; in response to the detection operation of the stop command detecting means;
means for detecting whether or not the car passes through the inter-floor detector for the first time; when the passage detecting means detects that the car passes for the first time, the car position detection calculation is performed in response; An elevator position detection device characterized by comprising: means for restricting the car position detection calculation described above until the car is operated again in response to detecting that the car has passed the car for the second time or later.