KR101447399B1 - Termination floor forced deceleration device for elevator - Google Patents

Abstract

Provided is an end-stage forced reduction device for an elevator capable of simplifying installation adjustment and shortening the time required for installation adjustment. For this purpose, an elevator having an overspeed monitoring section for outputting a braking command for decelerating the elevator car, when the speed of the elevator car when the elevator car is at a position within a predetermined distance from the end of the hoistway is equal to or greater than a predetermined speed, The two position detection sensors being provided in the hoistway along the lifting path of the car in the hoistway to detect the operating plate and the two position detecting sensors are provided on the output of both of the two position detecting sensors Based on an output from the consistency check circuit, the overspeed monitoring section determines whether or not the elevator car is within a predetermined distance from the end of the hoistway based on the output from the consistency check circuit Position of the vehicle.

Description

TECHNICAL FIELD [0001] The present invention relates to a termination floor forced deceleration device for an elevator,

The present invention relates to a forced-speed reduction device for an end-point layer of an elevator.

Generally, in an elevator, an elevator car or a shock absorber for preventing balance further collision is provided at a bottom pit of a hoistway. This shock absorber needs to be a stroke that can sufficiently cushion the shock absorber even when the car collides with the shock absorber at full speed. The required stroke increases as the elevator's rated speed increases. Therefore, the higher the rated speed of the elevator, the deeper the pit on which the shock absorber is installed. However, if the rated speed increases above a certain level, the required depth of the pit becomes unrealistic. In this case, a device for shortening the stroke of the shock absorber to a shorter length than originally necessary, making the depth of the pit shallow, and decelerating the elevator car or the like before colliding with the shock absorber is often installed.

Specifically, when the car approaches the end of the hoistway and the traveling speed of the car reaches a predetermined overspeed detection level or higher corresponding to the distance from the terminating end, the terminal compulsory decelerating device forcibly decelerates the car will be. In such a conventional longitudinally-forced-speed reduction device for an elevator, a position detection switch is provided in an elevator car, and a cam engaged with the position detection switch is provided near the upper end of the hoistway and the lower end of the hoistway (See, for example, Patent Document 1). In the conventional terminal layer forced decelerator disclosed in Patent Document 1, an operating point is provided in the cam, and a position detecting switch engaged with the cam is operated at this operating point, thereby detecting that the car has reached a predetermined position from the end of the hoistway do. Then, the speed of the car at that time is confirmed, and when the speed is equal to or higher than the overspeed detection level, the car is forcibly decelerated.

[Patent Document 1] Japanese Patent Application Laid-Open No. 10-324474

Here, in order to sufficiently decelerate the elevator car at the end of the hoistway, it is necessary to check the speed of the elevator car at a position farther from the longitudinal end as the elevating speed of the elevator becomes higher. In the conventional terminal-side forced decelerator for an elevator as in Patent Document 1, in order to detect the position of the car, an operating point for operating the position detecting switch must be set to the cam.

Therefore, the entire length of the cam required to set the operating point for detecting the position of the car at a position far from the end is long, and the position of the operating point largely changes if the cam is tilted even a little. For this reason, there is a problem that troublesome labor is required to adjust the installation of the cam and the installation adjustment time is increased.

In addition, if the entire length of the cam is increased, the amount of material required for manufacturing the cam also increases, thereby increasing the cost required for the device.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and it is an object of the present invention to obtain an end-stage forced reduction device for an elevator which can simplify installation adjustment and shorten the time required for installation adjustment.

The apparatus for forced deceleration of a terminal for an elevator according to the present invention comprises an elevator car disposed in a hoistway of an elevator in a freely liftable manner and an elevator car which is movable in the elevator car when the elevator car is located within a predetermined distance from an end of the hoistway And an overspeed monitoring unit for outputting a braking command for decelerating the elevator car when the speed of the elevator car is equal to or greater than a predetermined speed, the elevator car comprising: an operating plate provided in the elevator car; Two position detection sensors that are provided side by side in accordance with the elevation path of the car and detect the operation plate; and an output from the self when the outputs of the two are matched based on the outputs of the two position detection sensors And a consistency check circuit for inverting Speed monitoring unit to recognize whether the end from which the elevator car in the elevator shaft on the basis of an output from the matching check circuit to within a predetermined distance of the location.

The effect of the present invention is that the installation adjustment can be simplified and the time required for installation adjustment can be shortened in the terminal end compulsory deceleration device for an elevator according to the present invention.

Brief Description of Drawings Fig. 1 is a view for explaining the overall configuration of an end-stage forced reduction device for an elevator according to Embodiment 1 of the present invention. Fig.
2 is a time chart for explaining the operation state of the consistency check circuit according to Embodiment 1 of the present invention.
Fig. 3 is a flowchart showing processing at power-on of the operation control unit according to Embodiment 1 of the present invention. Fig.
4 is a time chart explaining the operation state of the consistency check circuit at the time of sensor abnormality (ON failure) according to Embodiment 1 of the present invention.
5 is a time chart for explaining the operation state of the consistency check circuit at the time of sensor abnormality (ON failure) according to Embodiment 1 of the present invention.
6 is a time chart for explaining the operation state of the consistency check circuit at the time of sensor abnormality (OFF failure) according to Embodiment 1 of the present invention.
7 is a time chart for explaining the operation state of the consistency check circuit at the time of sensor abnormality (OFF failure) according to Embodiment 1 of the present invention.
8 is a view for explaining the overall configuration of an end-stage forced reduction device of an elevator according to Embodiment 2 of the present invention.

The present invention will be described with reference to the accompanying drawings. The same reference numerals denote the same or corresponding parts throughout the drawings, and redundant descriptions thereof are appropriately simplified or omitted.

Embodiment 1

FIG. 1 is a diagram illustrating the overall configuration of a terminal-end compulsory decelerator for an elevator. FIG. 2 is a time chart for explaining the operation state of the consistency check circuit, 4 and 5 are time charts for explaining the operation state of the consistency check circuit at the time of sensor abnormality (ON failure), and Figs. 6 and 7 are time charts Is a time chart explaining the operation state of the consistency check circuit at the time of sensor abnormality (OFF failure).

1, reference numeral 1 denotes a hoistway of an elevator. A machine room (2) is provided at the top of the hoistway (1). On the bottom of the hoistway 1, the pit 3 is further formed downwardly from the floor surface of the lowermost layer. In the hoistway 1, an elevator car 4, which lifts and lowers between a plurality of floors, is installed (arranged) by a user. A balance weight 5 for compensating a load applied to the car 4 is also disposed in the hoistway 1 in a hoistway.

The machine room 2 at the top of the hoistway 1 is provided with a hoisting machine 6 for driving the elevator car 4 and the balance weight 5 to move up and down. One end of the main rope 7 is connected to an upper portion of the car 4. The main rope 7 extends vertically upward in the hoistway 1 at the upper portion of the car 4 and is wound around a driving sheave 6a of the hoist 6 in the middle thereof. The other end side of the main rope 7 extends vertically downward into the hoistway 1 at the drive sheave 6a of the hoisting machine 6 and is connected to the upper part of the counterweight 5. The elevator car 4 and the balance weight 5 are hung in a hoop shape in the hoistway 1 by the main rope 7. [

A governor (8) is provided in the machine room (2) at the top of the hoistway (1). A tension pulley 9 is rotatably provided in the pit 3 in the vicinity of the bottom of the hoistway 1. Between the governor 8 and the tension pulley 9, the governor rope 10 is wound in an endless form. This governor rope 10 is fixed to the car 4 on one side. When the elevator car 4 ascends and descends, the governor rope 10 rotates around and the sheave of the governor 8 rotates at a rotational speed and a rotational speed corresponding to the elevating speed of the car 4. The speed governor 8 is equipped with a speed detector 11 such as a rotary encoder for detecting the rotation speed of the sheave of the governor 8. The rotation speed of the sheave of the governor 8 detected by the speed detector 11 is output as the speed detection signal 11a.

A car shock absorber 12 is provided at the lowermost portion of the elevating path of the car 4 at the bottom of the pit 3 to mitigate the impact at the time of collision of the car 4. A balancing cushion 13 for mitigating the impact at the time of impact of the balance weight 5 is provided at the lowermost end of the lifting path of the balance weight 5 at the bottom of the pit 3.

The operation of the device relating to the overall operation of the elevator is controlled by various control devices housed in the control panel 14. [ The operation control section 14a in the control panel 14 controls the operation of the elevator (the car 4) by controlling the operation of the traction machine 6 or the brake 6b. The overspeed monitoring section 14b in the control panel 14 monitors the speed of the elevator car 4 based on the speed detection signal 11a output from the speed detector 11. [ When it is determined that the speed of the car 4 has exceeded the predetermined overspeed detection speed, the governor 8 is operated. When the governor 8 is operated, the governor rope 10 is gripped, so that an emergency brake (not shown) provided in the car 4 is operated to stop the car 4 in an emergency.

A first downward position detection sensor (BTA) 15a and a second downward position detection sensor (BTA) 15a for detecting that the car 4 is at a predetermined lower end position are provided at predetermined positions near the lower end in the hoistway 1 BTB) 15b are provided. The first lower position detecting sensor (BTA) 15a and the second lower position detecting sensor (BTB) 15b are juxtaposed at predetermined intervals in accordance with the elevation direction of the car 4. At this time, the first downward position detecting sensor (BTA) 15a is arranged to come to the lower end side of the hoistway 1 with respect to the second lower position detecting sensor (BTB) 15b.

A first upper position detecting sensor (TPA) 16a and a second upper position detecting sensor 16b for detecting that the car 4 is positioned at a predetermined upper end position is provided at a predetermined position near the upper end of the hoistway 1, And a sensor (TPB) 16b. The first upper position detection sensor (TPA) 16a and the second upper position detection sensor (TPB) 16b are juxtaposed at predetermined intervals in accordance with the elevation direction of the car 4. At this time, the first upper position detecting sensor (TPA) 16a is arranged so as to come to the upper end side of the hoistway 1 with respect to the second upper position detecting sensor (TPB) 16b.

The elevator car 4 is equipped with a shielding plate 17 facing the position detection sensor. When the elevator car 4 comes to the predetermined lower end position, the shielding plate 17 of the car 4 is moved to the first lower position detecting sensor (BTA) 15a and the second lower position detecting sensor (BTB) As shown in Fig. Similarly, when the elevator car 4 comes to the predetermined upper end position, the shield plate 17 of the elevator car 4 is moved to the first upper position detecting sensor TPA 16a and the second upper position detecting sensor TPB, (16b) are blocked.

This position detection sensor is a non-contact type sensor. When the sensor portion of the position detection sensor is not blocked by the shield plate 17 at a normal time, the voltage (potential) is relatively high. In addition, the position detection sensor whose sensor is intercepted in the shield plate 17 of the car 4 is in a state in which the voltage (potential) is relatively low. Hereinafter, a state in which the voltage (potential) is relatively high is expressed as a state in which (signal) is output, and a state in which the voltage (potential) is relatively low is referred to as a state in which the output is blocked.

In the control panel 14, a downward position detection sensor consistency check circuit 18 and an upside position detection sensor consistency check circuit 19 are provided. The downward position detection sensor consistency check circuit 18 is for checking the consistency of the output results of the first downward position detection sensor (BTA) 15a and the second downward position detection sensor (BTB) 15b. The output from the downward position detection sensor consistency check circuit 18 is input to the overspeed monitoring portion 14b. The upper position detection sensor consistency check circuit 19 is for checking the consistency of the output results of the first upper position detection sensor (TPA) 16a and the second upper position detection sensor (TPB) 16b. The output from the upper position detection sensor consistency check circuit 19 is also input to the overspeed monitoring section 14b.

The overspeed monitoring section 14b determines whether or not the elevator car 4 is lower than the predetermined lower termination position on the basis of the outputs of the lower position detection sensor consistency check circuit 18 and the upper position detection sensor consistency check circuit 19 , Or whether it is located on the upper end side than the predetermined upper end position. The overspeed monitoring unit 14b determines that the speed of the car 4 is equal to or greater than a predetermined speed determined in advance and that the speed detection signal 11a , The braking command is issued to the operation control unit 14a so as to forcibly stop or decelerate the car 4. The operation control unit 14a having received the brake command controls the brake 6b to stop or decelerate the car 4.

At this time, the speed at which the car 4 is forcibly decelerated when it is on the lower end side than the lower end position is different from the speed for forcibly decelerating the car 4 in the case where the car 4 is located above the upper end position It can be set to a different value.

The lower position detection sensor consistency check circuit 18 includes a first lower-side relay LWA 20a, a second lower-side relay LWB 20b, and a third lower-side relay LWC 20c, which are three safety relays Side contact 22a and a first lower-side normally-closed contact (normally closed contact) 22a that open and close in conjunction with the operation of the first lower-side relay LWA 20a The second lower side upper contact 22b and the second lower side normally closed contact 23b and the third lower side relay LWC (LWC) 23a, 23a, 23a, 23a, And a third downward-side upper contact 22c and a third lower-side normally-closed contact 23c, which are opened and closed in conjunction with the operation of the first and second lower-side contacts 20a and 20c.

The output side of the first downward position detection sensor (BTA) 15a is connected to the first lower-side relay (LWA) 20a. A third lower side upper contact 22c is inserted in series between the first lower position detecting sensor (BTA) 15a and the first lower side relay (LWA) 20a. The first lower-side upper contact 22a is connected to the third lower-side upper contact 22c in parallel. The output side of the second downward position detection sensor (BTB) 15b is connected to the second lower-side relay (LWB) 20b. A third lower-side upper contact 22c is inserted in series between the second lower-position detecting sensor BTB 15b and the second lower-side relay LWB 20b. The second lower side upper contact 22b is connected to the third lower side upper contact 22c in parallel.

An output side of the first upper position detecting sensor (TPA) 16a and a second upper position detecting sensor TPB (16b) are connected to the third lower side relay (LWC) 20c of the lower position detecting sensor consistency check circuit 18, Are connected to each other. The first lower side normally closed contact 23a and the second lower side position detection sensor TPB 16b are provided between the third lower side relay (LWC) 20c and the first upper position detection sensor (TPA) 16a and the second upper position detection sensor 2 lower-side normally closed contact 23b are inserted in series. The third downward-side upper contact 22c is connected to the first lower-side normally closed contact 23a in parallel.

The output side of the first upper position detection sensor (TPA) 16a and the output side of the second upper position detection sensor (TPB) 16b are provided in the lower position detection sensor consistency check circuit 18, After the upper contact 22a, the second lower-side upper contact 22b and the third lower-side normally closed contact 23c are connected in series, the lower position detection sensor consistency check circuit 18 to the overspeed monitoring portion 14b .

The upper position detection sensor consistency check circuit 19 includes a first upper relay (UPA) 21a, a second upper relay (UPB) 21b, a third upper relay (UPC) 21c And a first upper upper contact 24a and a first upper upper contact 22b that are opened and closed in cooperation with the operation of the first upper relay UPA 21a, 21b that are opened and closed in conjunction with the operation of the second upper-side upper contact 24b, the second upper-side normally closed contact 25b, and the third upper-side relay (UPC) 21c, Side upper contact 24c and a third upper-side normally closed contact 25c.

The output side of the first upper position detection sensor (TPA) 16a is connected to the first upper relay (UPA) 21a. A third upper upper contact 24c is inserted in series between the first upper position detecting sensor TPA 16a and the first upper relay UPA 21a. The first upper-side upper contact 24a is connected to the third upper-side upper contact 24c in parallel. The output side of the second upper position detection sensor (TPB) 16b is connected to the second upper relay (UPB) 21b. A third upper upper contact 24c is inserted in series between the second upper position sensor (TPB) 16b and the second upper relay (UPB) 21b. The second upper-side upper contact 24b is connected to the third upper-side upper contact 24c in parallel.

The output side of the first upper position detection sensor (TPA) 16a and the output side of the second upper position detection sensor (TPB) 16b are also connected to the third upper relay (UPC) 21c. A first upper-side normally closed contact 25a and a second upper-side relay 25b are provided between the first upper position detecting sensor TPA 16a and the second upper position detecting sensor TPB 16b and the third upper relay UPC 21c, 2 upper-side normally closed contact 25b are inserted in series. The third upper-side upper contact 24c is connected to the first upper-side normally closed contact 25a in parallel.

In addition, the output side of the first upper position detection sensor (TPA) 16a and the output side of the second upper position detection sensor (TPB) 16b are provided in the upper position detection sensor consistency check circuit 19, After the upper contact 24a, the second upper contact 24b and the third upper contact 24b are connected in series, the upper position detection sensor consistency check circuit 19 to the overspeed monitoring portion 14b .

When the power is turned on, the elevator equipped with the terminal-layer forced deceleration device configured as described above operates in accordance with the flow shown in FIG. 7 to be described later.

Fig. 2 is a graph showing the relationship between the distance between the lower portion of the elevator car 4 and the lower portion of the elevator car 4 when the elevator car 4 is in the lowermost layer and then the elevator car 4 is moved to the uppermost floor, The position detection sensor consistency check circuit 18 and the upper position detection sensor consistency check circuit 19 shown in Fig.

First, when the car 4 is at the lowest floor, the car 4 is below the predetermined lower end position. Therefore, all the position detection sensors, that is, the first downward position detection sensor (BTA) 15a, the second downward position detection sensor (BTB) 15b, the first upper position detection sensor (TPA) 16a, And the upper position detecting sensor (TPB) 16b are not blocked by the shielding plate 17 of the car 4. Therefore, signals are output from all of these position detection sensors.

In the lower position detection sensor consistency check circuit 18, in the initial state, the first lower-side relay LWA 20a and the second lower-side relay LWB 20b are released (energized) . The first lower side normally closed contact 23a between the first upper position detection sensor TPA 16a and the second upper position detection sensor TPB 16b and the third lower side relay LWC 20c, And the second lower-side normally closed contact 23b are closed, the third lower-side relay (LWC) 20c is in an energized state.

In the upper position detection sensor consistency check circuit 19, in the initial state, the first upper relay (UPA) 21a and the second upper relay (UPB) 21b are in a released state to be. Then, the first upper-side normally closed contact 25a (25a) between the first upper position detection sensor (TPA) 16a and the second upper position detection sensor (TPB) 16b and the third upper- ) And the second upper-side normally closed contact 25b are closed, so that the third upper-side relay (UPC) 21c is in an energized state.

In this state, since the first downward-side upper contact 22a and the second lower-side upper contact 22b are open and the third lower-side normally closed contact 23c is also open, the downward position detection sensor consistency check The output from the circuit 18 to the overspeed monitoring section 14b is blocked. Since the first upper-side upper contact 24a and the second upper-side upper contact 24b are open and the third upper-side normally closed contact 25c is also open, the upper position detection sensor consistency check circuit 19 to the overspeed monitoring section 14b are also blocked. Therefore, since there is no output from either of the downward position detection sensor consistency check circuit 18 and the upwards position detection sensor consistency check circuit 19, the overspeed monitoring portion 14b detects the position of the elevator car 4 Detection is in an indefinite state.

In this state, when the elevator car 4 ascends from the lowest floor and reaches a predetermined lower end position, the first lower position detecting sensor (BTA) 15a is firstly blocked by the shield plate 17 of the car 4 , The output from the first downward position detection sensor (BTA) 15a is cut off. Next, the shielding plate 17 blocks the second downward position detection sensor BTB 15b so that the first downward position detection sensor BTA 15a and the second downward position detection sensor BTB 15b Both of them are cut off by the shielding plate 17. In this state, the elevator car 4 is at a predetermined lower end position, and the outputs from both of the first downward position detection sensor (BTA) 15a and the second downward position detection sensor (BTB) 15b are blocked have.

When the elevator car 4 continues to rise, the first lower position detecting sensor (BTA) 15a is not blocked by the shield plate 17 and the first lower position detecting sensor (BTA) Lt; / RTI > When the output of the first downward position detection sensor (BTA) 15a is resumed, the third downside-side relay (LWC) 20c is energized and the third downside-side contact 22c is closed. The lower-side relay (LWA) 20a is energized. When the first lower-side relay (LWA) 20a is energized, the first lower-side upper contact 22a of the lower position-detection-sensor consistency check circuit 18 is closed and the first lower-side normally closed contact 23a is opened. Therefore, the first lower-side relay (LWA) 20a is in a self-maintained state.

Since the third downward-side upper contact 22c is closed even when the first lower-side normally closed contact 23a is opened, the third downward-side relay (LWC) 20c is kept energized. In this state, the output from the downward position detection sensor consistency check circuit 18 to the overspeed monitoring section 14b is still blocked. Therefore, in the overspeed monitoring section 14b, the position detection of the car 4 is held in an unfixed state.

In addition, when the car 4 rises, the shield plate 17 does not block the second downward position detection sensor BTB 15b, and the output from the second downward position detection sensor BTB 15b Resumed. When the output of the second downward position detecting sensor (BTB) 15b is resumed at the point that the third downward-direction relay (LWC) 20c is energized and the third downward-side upper contact point 22c is closed, 2 lower side relay (LWB) 20b are excited. When the second lower-side relay (LWB) 20b is excited, the second lower-side upper contact 22b of the downward-position detecting sensor consistency check circuit 18 is closed and the second lower-side normally closed contact 23b is opened . Therefore, the second lower-side relay (LWB) 20b is also in a self-retained state.

When the second lower side normally closed contact 23b is opened, the third lower side relay (LWC) 20c is released. When the third downside relay (LWC) 20c is released, the third downward side upper contact 22c of the downward position detection sensor consistency check circuit 18 is opened and the third downward side normally closed contact 23c is closed . Therefore, since the first downward-side upper contact 22a and the second lower-side upper contact 22b are closed and the third lower-side normally closed contact 23c is also closed, the downward- And the signal is output to the monitoring unit 14b (voltage is high).

Thus, when the elevator car 4 ascends from the lower end position, a signal is output from the downward position detection sensor consistency check circuit 18. Therefore, the overspeed monitoring unit 14b can recognize that the elevator car 4 ascends and descends from the lower end position by the signal output from the downward position detecting sensor consistency check circuit 18. [ Then, while there is an output from the downward position detection sensor consistency check circuit 18, there is no output from the upper position detection sensor consistency check circuit 19. The overspeed monitoring unit 14b recognizes that the elevator car 4 is in the upper end position in this output situation.

The shield plate 17 of the car 4 firstly blocks the second upper position detection sensor TPB 16b and then the first upper position detection sensor TPB 16b, Both the first upper position detecting sensor TPA 16a and the second upper position detecting sensor TPB 16b are blocked by the shielding plate 17 State. In this state, the elevator car 4 is at the predetermined upper end position, and the output from both of the first upper position detecting sensor (TPA) 16a and the second upper position detecting sensor (TPB) 16b is blocked have. The output from the upper position detection sensor consistency check circuit 19 to the overspeed monitoring section 14b is still blocked.

The shielding plate 17 does not block the second upper position detecting sensor TPB 16b and the second upper position detecting sensor TPB 16b, Lt; / RTI > Since the third upper-side relay (UPC) 21c is excited and the third upper-side contact 24c is closed, the output from the second upper-position sensor TPB 16b is resumed , The second upper relay (UPB) 21b is energized. When the second upper-side relay UPB 21b is energized, the second upper-side relay contact 24b is closed and the second upper-side relay UPB 21b is self-sustained, and the second upper- The contact 25b is opened and the third upper relay (UPC) 21c is released.

When the elevator car 4 further ascends in this state, the shielding plate 17 does not block the first upper position detecting sensor TPA 16a, and the first upper position detecting sensor TPA 16a Lt; / RTI > Since the third upper-side relay (UPC) 21c is already released, even if the output of the first upper position detecting sensor TPA 16a is resumed, the first upper-side relay UPA 21a is not energized It is still released. Therefore, the output from the upper position detection sensor consistency check circuit 19 to the overspeed monitoring portion 14b is still blocked.

Thus, when the elevator car 4 ascends from the predetermined upper end position and arrives at the uppermost floor, it starts descending toward the lowest floor at this time. When the elevator car 4 reaches a predetermined upper end position, the first upper position detecting sensor TPA 16a is first intercepted by the shield plate 17 of the car 4, The output from the sensor (TPA) 16a is cut off. Subsequently, the shielding plate 17 blocks the second upper position detecting sensor TPB 16b, and the first upper position detecting sensor TPA 16a and the second upper position detecting sensor TPB 16b Both of them are cut off by the shielding plate 17. In this state, the elevator car 4 is at the predetermined upper end position, and the output from both of the first upper position detecting sensor (TPA) 16a and the second upper position detecting sensor (TPB) 16b is blocked have.

Then, as the output from the second upper position detection sensor (TPB) 16b is cut off, the second upper-side relay (UPB) 21b is released. When the second upper-side relay (UPB) 21b is released, the second upper-side normally closed contact 25b is closed, and the third upper-side relay (UPC) 21c is excited.

When the car 4 continues to descend, the shield plate 17 does not block the first upper position detection sensor TPA 16a and the first upper position detection sensor TPA 16a Is restarted. When the output of the first upper position detecting sensor (TPA) 16a is resumed, the third upper-side relay (UPC) 21c is excited and the third upper-side upper contact point 24c is closed. 1 upper relay (UPA) 21a is energized. When the first upper relay (UPA) 21a is energized, the first upper-side upper contact 24a is closed and the first upper-side normally closed contact 25a is opened. Therefore, the first upper relay (UPA) 21a is in a self-maintained state.

Here, even if the first upper-side normally closed contact 25a is opened, since the third upper-side upper contact point 24c is closed, the third upper-side relay (UPC) 21c is kept energized. In this state, the output from the upper position detection sensor consistency check circuit 19 to the overspeed monitoring portion 14b is still blocked. Therefore, in the overspeed monitoring section 14b, the state in which the elevator car 4 is recognized as being in the upper end position is maintained.

When the car 4 descends further, the shield plate 17 does not block the second upper position detecting sensor TPB 16b and the output from the second upper position detecting sensor TPB 16b Resumed. When the output of the second upper position detecting sensor (TPB) 16b is resumed, the third upper-side relay (UPC) 21c is energized and the third upper-side upper contact point 24c is closed, The upper relay (UPB) 21b is energized. When the second upper-side relay UPB 21b is energized, the second upper-side upper contact point 24b is closed and the second upper-side normally closed contact point 25b is opened. Therefore, the second upper relay (UPB) 21b is also in a self-retained state.

When the second upper-side normally closed contact 25b is opened, the third upper-side relay (UPC) 21c is released. When the third upper-side relay (UPC) 21c is released, the third upper-side upper contact point 24c is opened and the third upper-side normally closed contact point 25c is closed. Therefore, since the first upper-side upper contact 24a and the second upper-side upper contact 24b are closed and the third upper-side normally closed contact 25c is also closed, the over- And the signal is output to the output section 14b.

Thus, when the car 4 descends and descends from the upper end position, a signal is output from the upper position detection sensor consistency check circuit 19. Therefore, the overspeed monitoring section 14b can recognize that the car 4 descends from the upper end position by the signal output from the upper position detection sensor consistency check circuit 19. Then, there is output from both the downward position detection sensor consistency check circuit 18 and the upside position detection sensor consistency check circuit 19. The overspeed monitoring unit 14b recognizes that the car 4 is in the middle of the upward and downward end positions in this output situation.

When the elevator car 4 which has traveled from the lowest floor to the uppermost floor once again reaches a predetermined lower end position, the shield plate 17 of the car 4 first reaches the second lower position detecting sensor BTB 15b . Then, the output from the second downward position detection sensor (BTB) 15b is cut off and the second downside relay (LWB) 20b which has been excited until then is released. The output from the downward position detection sensor consistency check circuit 18 to the overspeed monitoring portion 14b is blocked because the second downward side contact 22b is opened when the second downward relay LBB 20b is released, do.

When the elevator car 4 reaches a predetermined lower end position and the first downward position detection sensor BTA 15a is also blocked by the shield plate 17, the first downward position detection sensor BTA 15a Is also cut off. Then, the first lower-side relay (LWA) 20a that has been excited is released. When the first lower-side relay (LWA) 20a is released, the third lower-side relay (LWC) 20c is excited because the first lower-side normally closed contact 23a is closed.

When the elevator car 4 further descends and the second downward position detection sensor BTB 15b is not blocked by the shield plate 17, the output from the second downward position detection sensor BTB 15b The second lower side relay (LWB) 20b is energized. When the second lower-side relay (LWB) 20b is energized, the second lower-side normally closed contact 23b is opened, so that the third lower-side relay (LWC) 20c is released.

When the first downward position detection sensor (BTA) 15a is not blocked by the shield plate 17, the first downward position detection sensor (BTA) 15a Lt; / RTI > However, at this point, since the third lower-side relay (LWC) 20c is not energized, the third downward-side upper contact 22c is open. Therefore, even if the output from the first downward position detection sensor (BTA) 15a is resumed, the first downside relay (LWA) 20a is not energized. Therefore, the output from the downward position detection sensor consistency check circuit 18 to the overspeed monitoring portion 14b is maintained in the disconnected state.

When the elevator car 4 starts to rise again after the elevator car 4 reaches the lowest floor beyond the lower end position, the first lower position detecting sensor (BTA) . Subsequently, the second downward position detecting sensor BTB 15b is also blocked by the shielding plate 17, and the first downward position detecting sensor BTA 15a and the second downward position detecting sensor BTB 15b are shut off, the third lower-side relay (LWC) 20c is energized.

When the third lower side relay (LWC) 20c is energized, the elevator car 4 is raised so that the first downward position detection sensor (BTA) 15a is not blocked by the shield plate 17 , And the output from the first downward position detection sensor (BTA) 15a is resumed, the first lower-side relay (LWA) 20a is excited and held. The elevator car 4 further rises and the second downward position detecting sensor BTB 15b is not blocked by the shielding plate 17 and the second downward position detecting sensor BTB 15b When the output is also resumed, the second lower side relay (LWB) 20b is also excited and held.

In the stage where the second lower-side relay (LWB) 20b is excited, the output from the lower position detection sensor consistency check circuit 18, which has been shut down, to the overspeed monitoring portion 14b is resumed. As described above, during the period from when the car reaches the lowest floor beyond the predetermined lower end position to the time when it reaches the lower floor and then again passes above the lower end position, the signal from only the upper position detection sensor consistency check circuit 19 And the downward position detection sensor consistency check circuit 18 outputs no signal. The overspeed monitoring unit 14b recognizes that the car 4 is in the lower end position in this output situation.

When the elevator car 4 moves upward from the lower end position, the output from the downward position detection sensor consistency check circuit 18 is resumed, and the downward position detection sensor consistency check circuit 18 and the upward position detection sensor consistency The overspeed monitoring section 14b recognizes that the car 4 is in the middle of the upper and lower end positions because the check circuit 19 is in an output state from both sides.

Thereafter, when the elevator car 4 ascends and reaches the upper end position, the output from the upper position detection sensor consistency check circuit 19 is cut off, and only the signal from the lower position detection sensor consistency check circuit 18 is output And the overspeed monitoring unit 14b recognizes that the car 4 is at the upper end position. When the elevator car 4 descends and comes down below the upper end position, the overspeed monitoring unit 14b restarts the output from the upper position detection sensor consistency check circuit 19, And the lower end position.

After the power is turned on, the elevator car 4 is operated from the lowest floor to the uppermost floor once and the first lower position detecting sensor (BTA) 15a and the second lower position detecting sensor BTB are operated by the shielding plate 17, The upper position detection sensor TPA 16a and the second upper position detection sensor TPB 16b are cut off once so that the lower position detection sensor consistency check circuit 18 and the upper position detection sensor The operation state of the consistency check circuit 19 is reset. Based on the output of the consistency check circuit, the overspeed monitoring section 14b recognizes the position of the car 4.

That is, when there is output only from the downward position detection sensor consistency check circuit 18 and there is no output from the upside position detection sensor consistency check circuit 19, the overspeed monitoring portion 14b determines that the car 4 Position. Conversely, when there is output only from the upper position detection sensor consistency check circuit 19 and there is no output from the lower position detection sensor consistency check circuit 18, the overspeed monitoring portion 14b determines that the car 4 And recognizes that it is in the end position. When there is an output from both the downward position detection sensor consistency check circuit 18 and the upside position detection sensor consistency check circuit 19, the overspeed monitoring portion 14b recognizes that the car 4 is at the intermediate position .

As described above, until the elevator car 4 is once driven from the terminal end layer to the opposite end terminal layer after the power is turned on and all the position detecting sensors are shut off by the shielding plate 17, the elevator car 4 is moved to the intermediate position And the elevator car 4 is recognized at the end position. The operation control section 14a controls the maximum speed of the car 4 to be the speed corresponding to the buffer (buffer), not the rated speed, until the car 4 once reciprocates between the two end layers after the power is turned on (Hereinafter referred to as " buffer response speed ").

The flow chart of Fig. 3 shows a process flow in the travel control section 14a when the power is turned on.

When the power is turned on, first, in step S1, the operation control section 14a confirms whether or not an elevator car call or a platform call is registered. If the elevator car call or the landing call is registered, the maximum speed is set as the buffer corresponding speed in step S2. Then, in step S3, the operation control unit 14a responds to the registered call to the elevator car ( 4).

When the elevator car call or the landing call is not registered in step S1 or after the car 4 is driven in response to the call in step S3, the process proceeds to step S4. In this step S4, Confirms whether or not the car 4 stops at the lowest floor. If the car 4 is stopped at the lowest floor, the process proceeds to step S5, and the travel control unit 14a causes the car 4 to travel to the uppermost floor at a buffer corresponding speed. Then, in the following step S6, the operation control section 14a confirms whether or not an elevator car call or a landing call is registered.

If the elevator car call or the landing call is not registered in step S6, the travel control unit 14a runs the car 4 at the lowest speed in the buffer corresponding speed in step S7, and then, in step S8, , The maximum speed is set as the rated speed, and the series of processing is terminated. On the other hand, if it is determined in step S6 that the car call or landing call is registered, the travel control unit 14a causes the car 4 to travel in response to the registered call in step S9.

Then, in the subsequent step S10, the operation control section 14a checks whether or not the car 4 is stopped at the lowest floor. If the car 4 is at the lowest level, the operation control section 14a proceeds to step S8, Is set to the rated speed, and the series of processing is terminated. On the other hand, when the car 4 is not stopped at the lowest floor, the process returns to step S6.

On the other hand, if it is determined in step S4 that the car 4 has not stopped at the lowest floor, the process proceeds to step S11. The operation control unit 14a checks whether or not the car 4 is stopped at the uppermost level in step S11. If the car 4 is not stopped on the uppermost floor, It is checked whether or not the intermediate layer is stopped. When the elevator car 4 is stopped at the uppermost level in step S11 or when the elevator car 4 is stopped in the middle floor in step S12, the process proceeds to step S13.

In step S13, the operation control section 14a drives the car 4 at the lowest speed corresponding to the buffer. Then, in the following step S14, the operation control section 14a confirms whether or not an elevator car call or a landing call is registered. If it is determined in step S14 that the elevator car call or landing call is not registered, the travel control unit 14a drives the car 4 to the uppermost floor at the buffer corresponding speed in step S15. In step S8, The maximum speed is set to the rated speed, and the series of processing is terminated.

On the other hand, if it is determined in step S14 that the car call or the landing call has been registered, the operation control unit 14a causes the car 4 to travel in response to the registered call in step S16. Then, in the following step S17, the operation control section 14a checks whether or not the car 4 is stopped on the uppermost floor. If the car 4 is stopped at the uppermost floor, the operation control section 14a proceeds to step S8, Is set to the rated speed, and the series of processing is terminated. On the other hand, when the elevator car 4 is not stopped at the uppermost floor, the process returns to step S14.

As described above, the end-layer forced deceleration device according to this embodiment has two position detection sensors at the lower end and the upper end, respectively. The output of these position detection sensors is transmitted to the overspeed monitoring portion 14b via the consistency check circuit. Thereby recognizing whether or not the car 4 is at the predetermined end position. In the thus-configured endpoint layer forced deceleration device, the lower position detection sensor consistency check circuit 18 and the upper position position sensor consistency check circuit 18 when an abnormality occurs in either one of the two position detection sensors provided on the same longitudinal end side, FIG. 4 to FIG.

First, FIG. 4 shows a case where an ON failure, that is, a failure in which a continuous signal is output to the first downward position detection sensor (BTA) 15a of two downward position detection sensors occurs. Here, it is assumed that after the power is turned on, a failure occurs after the elevator car 4 is operated from the lowest floor to the highest floor. Therefore, the operation is the same as that of FIG. 2 until the car 4 is operated from the lowest floor to the uppermost floor after the power is turned on, and the car 4 descends from the uppermost floor to a position immediately before the predetermined lower end position. do.

When the elevator car 4 reaches a predetermined lower end position, the shield plate 17 of the car 4 first blocks the second downward position detection sensor BTB 15b. Then, the output from the second downward position detecting sensor (BTB) 15b is cut off, and the second downside relay (LWB) 20b which has been excited until then is released. The output from the downward position detection sensor consistency check circuit 18 to the overspeed monitoring portion 14b is blocked because the second downward side contact 22b is opened when the second downward relay LBB 20b is released, do.

Next, when the car 4 reaches a predetermined lower end position, the first downward position detecting sensor (BTA) 15a is also blocked by the shielding plate 17. However, since the first downward position detection sensor (BTA) 15a is ON failure, the output from the first downward position detection sensor (BTA) 15a is continued without being blocked. Therefore, the first lower-side relay (LWA) 20a is kept energized. Therefore, the first lower-side normally closed contact 23a remains open and the third lower-side relay (LWC) 20c is not energized.

When the elevator car 4 further descends and the second downward position detection sensor BTB 15b is not blocked by the shield plate 17, the output from the second downward position detection sensor BTB 15b Resumed. However, since the third lower-side relay (LWC) 20c is not energized, the third lower-side upper contact 22c is open and the second lower-side relay (LWB) 20b is not energized.

When the first downward position detection sensor (BTA) 15a fails to be ON in this way, the first downward position detection sensor (BTA) 15a and the second downward position detection sensor BTB The first lower-side relay LWA 20a is kept energized while the second lower-side relay LBB 20b and the third lower-side relay LWC 20c are energized when the first lower- . This is also true when the elevator car 4 ascends from the lowest floor and passes through the lower end position. Therefore, even if the elevator car 4 ascends from the lowest floor and passes through the lower end position, no signal is output from the downward position detection sensor consistency check circuit 18. [

That is, even when the first downward position detection sensor (BTA) 15a is turned ON, when the car 4 descends to the predetermined lower end position, the downward position detection sensor consistency check circuit 18 checks the over- (14b) is cut off. For this reason, it is possible for the overspeed monitoring section 14b to recognize that the car 4 is at the lower end position. However, since the signal is not outputted from the downward position detection sensor consistency check circuit 18 even if the elevator car 4 ascends from the lowermost layer and passes the lower end position, the overspeed monitoring portion 14b detects that the elevator car 4 And remain in the lower end position.

This state means that the overspeed monitoring section 14b has misidentified (misrecognized) the position of the car 4. However, this misunderstanding is recognized as a safe side, not a dangerous side. That is, since the state where the maximum speed of the elevator is set to the buffer corresponding speed which is slower than the rated speed continues, it is possible to secure safety.

FIG. 5 shows a case where an ON failure occurs in the second downward position detection sensor (BTB) 15b of the two downward position detection sensors. Here, as in the case of Fig. 4, it is assumed that after the power is turned on, a failure occurs after the elevator car 4 is operated from the lowest floor to the highest floor. Therefore, after the power is turned on, the operation of the elevator car 4 from the lowest floor to the uppermost floor is as shown in Fig. 2 until the elevator car 4 descends from the uppermost floor to a position just before the predetermined lower end position.

In this case, when the first downward position detection sensor (BTA) 15a and the second downward position detection sensor (BTB) 15b are blocked by the shield plate 17, the second downside relay LWB 20b And the first lower-side relay LWA 20a and the third lower-side relay LWC 20c are excited. Therefore, as in the case where the first lower position detecting sensor (BTA) 15a is turned ON, even if the elevator car 4 ascends from the lowermost layer and passes the lower end position, the lower position detecting sensor consistency check circuit 18, A signal is not output from the signal processing unit.

That is, even when the second downward position detecting sensor (BTB) 15b is turned ON, when the car 4 descends to a predetermined lower end position, the downward position detecting sensor consistency check circuit 18 checks the over- The output to the portion 14b is cut off. For this reason, it is possible for the overspeed monitoring section 14b to recognize that the car 4 is at the lower end position. Since the signal is not output from the downward position detection sensor consistency check circuit 18 even if the elevator car 4 ascends from the lowest floor and passes through the lower end position, ) Is in the lower end position. Therefore, the position of the car 4 in the safe side is recognized. Therefore, as in the case where the first downward position detecting sensor (BTA) 15a is turned ON, It is possible to recognize that the robot has descended to the position.

FIG. 6 shows a case where an OFF failure occurs in the first downward position detection sensor (BTA) 15a of the two downward position detection sensors, that is, a failure that the signal is not outputted. Here, as in the above case, it is assumed that after the power is turned on, a failure occurs after the elevator car 4 is operated from the lowest floor to the highest floor. Therefore, after the power is turned on, the operation of the elevator car 4 from the lowest floor to the uppermost floor is the same as in Fig. 2 until the elevator car 4 descends from the uppermost floor to a position just before the predetermined lower end position.

When the elevator car 4 reaches a predetermined lower end position, the shield plate 17 of the car 4 first blocks the second downward position detection sensor BTB 15b. Then, the output from the second downward position detecting sensor (BTB) 15b is cut off, and the second downside relay (LWB) 20b which has been excited until then is released. The output from the downward position detection sensor consistency check circuit 18 to the overspeed monitoring portion 14b is blocked because the second downward side contact 22b is opened when the second downward relay LBB 20b is released, do.

Next, when the elevator car 4 reaches a predetermined lower end position and the first downward position detecting sensor (BTA) 15a is also blocked by the shielding plate 17, the first downward position detecting sensor BTA 15a are also cut off. Then, the first lower-side relay (LWA) 20a that has been excited is released. When the first lower-side relay (LWA) 20a is released, the third lower-side relay (LWC) 20c is excited because the first lower-side normally closed contact 23a is closed.

Thereafter, when the car 4 descends, the second downward position detecting sensor BTB 15b and the first downward position detecting sensor BTA 15a are not blocked by the shielding plate 17. At this time, the output from the second downward position detection sensor (BTB) 15b is resumed, but the first downward position detection sensor (BTA) 15a is OFF failure, Is not restarted at a later time.

Therefore, if the first downward position detection sensor (BTA) 15a fails to be OFF, the first downside relay (LWA) 20a is not excited. Therefore, even if the elevator car 4 ascends from the lowest floor and passes the lower end position, the signal from the lower position detection sensor consistency check circuit 18 is not output .

That is, even when the first downward position detecting sensor (BTA) 15a fails, when the car 4 descends to a predetermined lower end position, the downward position detecting sensor consistency check circuit 18 detects the speed The output to the monitoring unit 14b is cut off. For this reason, it is possible for the overspeed monitoring section 14b to recognize that the car 4 is at the lower end position. Since the signal is not output from the downward position detection sensor consistency check circuit 18 even if the elevator car 4 ascends from the lowest floor and passes through the lower end position, ) Is in the lower end position. Therefore, it is possible to recognize that the elevator car 4 descends to the predetermined lower end position while ensuring the safety as in the case of the ON failure.

Further, when an OFF failure occurs in the second downward position detection sensor (BTB) 15b shown in FIG. 7, the detailed description is omitted.

The above description has been made on the case where one of the first down position detecting sensor (BTA) 15a and the second down position detecting sensor (BTB) 15b has failed. However, the first upper position detecting sensor (TPA) This also applies to the case where one of the first upper position detection sensor 16a and the second upper position detection sensor 16b is broken.

When the elevator car 4 is located at a position within a predetermined distance from the end of the hoistway, that is, when the elevator car is positioned lower than the lower end position or higher than the upper end position The speed monitoring section 14b outputs a braking command for decelerating the car 4 when the speed of the car 4 is equal to or higher than a preset speed.

The two position detection sensors (the first downward position detection sensor (BTA) 15a and the second downward position detection sensor (BTB)) 15a for detecting the shield plate 17, which is the operation plate provided in the car 4, (15b) or a first upper position detecting sensor (TPA) 16a and a second upper position detecting sensor (TPB) 16b) are juxtaposed in the hoistway 1 along the lifting path of the car 4.

The overspeed monitoring unit 14b includes a consistency check circuit for inverting an output from itself if the outputs of the two are matched based on the outputs of the two position detection sensors. Whether or not the car 4 is located within a predetermined distance from the end of the hoistway 1 based on the output of the elevator car 1. [

Here, the state in which the outputs of the two position detection sensors are matched means, for example, as shown in Fig. 2, when the output from one of the two is interrupted, the output from the other is also interrupted, The output from the other is also resumed. When the outputs from both are matched, the output from the consistency check circuit itself is inverted. That is, when a signal is output from the consistency check circuit, the output is cut off, and when the output from the consistency check circuit is blocked, the output is resumed.

Therefore, it is possible to detect that the car is at the end position without using the cam, so that the installation adjustment can be simplified and the time required for the installation adjustment can be shortened. In this case, by using the two position detection sensors and the consistency check circuit, high reliability can be ensured without providing a failure detection function in the position detection sensor itself. Furthermore, since the cam is not used, it is possible to suppress the cost required for manufacturing the device to a low level.

In addition, the consistency check circuit is configured so that the overspeed monitoring unit 14b outputs a signal indicating that the operation plate is detected from at least one of the two position detection sensors, That is, that the elevator car 4 is located at a position within the predetermined distance from the end of the hoistway 1, that is, the output is cut off.

Here, a state in which the outputs of the two position detection sensors are not matched (mismatch) means that, for example, as shown in Figs. 4 to 7, the output from the other The output from the other is not resumed even though the output from one of the two is resumed. When such a mismatch occurs, the output from the consistency check circuit is cut off, and the overspeed monitoring section 14b recognizes that the car 4 is at the upper and lower end positions.

Therefore, even when an abnormality occurs in one of the two position detecting sensors, it is possible to recognize that the car has descended to the end position while determining safety and securing safety.

Embodiment 2 Fig.

Fig. 8 is a diagram for explaining the overall configuration of a longitudinal-layer forced reduction device of an elevator according to a second embodiment of the present invention.

As described above, in the first embodiment, in order to set the operation state of the position detection sensor consistency check circuit at the time of turning on the power supply, the elevator car is operated from the terminal layer to the terminal layer on the opposite side once, I needed to block everyone once. This is also true at the time of power recovery after the power is cut off by a power failure or the like. That is, when the power supply is shut off due to a power failure or the like, all of the relays of the position detection sensor consistency check circuit are released. In addition, the position of the car can not be normally recognized unless the car is driven once from the terminating layer to the terminating layer on the opposite side.

Thus, the second embodiment described above is provided with a battery for maintaining the operating state of the relay immediately before the power supply is cut off in the position detection sensor consistency check circuit when the power supply is shut off due to a power failure or the like.

8, the battery 26 is connected to the downward position detection sensor consistency check circuit 18 and the upside position detection sensor consistency check circuit 19. [ When the power source is shut off due to a power failure or the like, power is supplied from the battery 26 to these position detection sensor consistency check circuits. Then, the operation (excitation) state of each relay of the position detection sensor consistency check circuit is maintained by the electric power supplied from the battery 26. [

Other configurations and operations are the same as those in the first embodiment, and a detailed description thereof will be omitted.

In the terminal end compulsory decelerator for an elevator configured as described above, the same effect as that of the first embodiment can be obtained. In addition, even when the power supply is shut off due to power failure or the like, the operation state of the relay of the position detection sensor consistency check circuit So that it is possible to normally recognize the position of the car without once driving the car from the terminating floor to the opposite terminating floor.

The present invention relates to an elevator control system for an elevator having an overspeed monitoring section for outputting a braking command for decelerating the elevator car when the speed of the elevator car reaches a predetermined speed when the elevator car is at a predetermined distance from an end of a hoistway It can be used for deceleration devices.

1 hoistway
2 machine room
3 feet
4 Elevator cubicles
5 Balance
6 traction machine
6a drive sheave
6b brake
7 week rope
8 Governor
9 Tension Pulley
10 Governor rope
11 Speed detector
11a Speed detection signal
12 Elevator box shock absorber
13 Balance Shock Absorber
14 Control Panel
14a,
14b An overspeed monitoring unit
15a First downward position detection sensor (BTA)
15b Second downward position detection sensor (BTB)
16a First upper position detecting sensor (TPA)
16b second upper position detecting sensor (TPB)
17 shield plate
18 Downward position detection sensor consistency check circuit
19 Upper position detection sensor consistency check circuit
20a First lower-side relay (LWA)
20b Second lower downside relay (LWB)
20c Third downside relay (LWC)
21a First upper-side relay (UPA)
21b Second upper-side relay (UPB)
21c Third Upper Relay (UPC)
22a first lower side upper contact
22b Second downward side upper contact
22c 3rd downward side upper contact
23a First lower-side normally closed contact
23b Second downward-side normally closed contact
23c Third downward side normally closed contact
24a first upper side upper contact
24b Second upper side upper contact
24c Upper third contact
25a First upper-side normally closed contact
25b Second upper-side normally closed contact
25c Third upper-side normally closed contact
26 Battery

Claims (8)

An elevator car disposed in a hoistway of an elevator in a freely movable manner,
And a speed monitoring unit for outputting a braking command for decelerating the elevator car when the speed of the car when the car is at a position within a predetermined distance from the end of the hoistway is not less than a predetermined speed CLAIMS 1. A forced deceleration device for an end-stage layer of an elevator,
An operating plate provided in the elevator car,
Two position detection sensors provided in the hoistway along the lifting path of the car and detecting the operating plate,
And a consistency check circuit for inverting an output from itself based on the outputs of both of the two position detection sensors when the outputs of the two are matched,
Wherein the consistency check circuit outputs an output indicating that the actuating plate is detected from at least one of the two and if the outputs of the both are not matched, And an initial state when the elevator is powered on is set to be within the predetermined distance from the end of the hoistway in the overspeed monitoring portion, Lt; RTI ID = 0.0 > 1, < / RTI >
Wherein the overspeed monitoring unit recognizes whether or not the elevator car is located at a position within the predetermined distance from an end of the hoistway based on an output from the consistency check circuit. delete delete delete The method according to claim 1,
And an operation control unit for controlling the operation of the elevator car,
Wherein the operation control unit sets the maximum speed of the car to be less than the predetermined speed when the elevator is powered on. The method of claim 5,
Wherein the operation control unit automatically sets the maximum speed of the elevator car at a rated speed after the elevator car is automatically reciprocated between upper and lower end floor layers after the power of the elevator is turned on. delete delete

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