Elevator control system and elevator control method

Abstract

An elevator control system and an elevator control method are provided that can effectively reduce the labor required for installing a safety device. [Solution] The elevator control system includes a structure, a sensor, a calculation unit, and an operation unit. The structure extends along the elevator shaft, and position information indicating an absolute position is disposed thereon. The sensor is installed in the car and reads the position information disposed on the structure. The calculation unit calculates both the speed of the car and the speed of the counterweight based on the position information read by the sensor. The operation unit activates a first safety device provided in the car and a second safety device provided in the counterweight based on the speed of the car and the speed of the counterweight calculated by the calculation unit.

Description

[Technical field]

[0001] FIELD OF THE PRESENT EMBODIMENTS The present invention relates to an elevator control system and an elevator control method. [Background technology]

[0002] In recent years, electronic safety devices have been widely used in elevators instead of conventional mechanical safety devices. For example, an electronic governor is known that uses a sensor installed in the car to read a code printed on a tape placed opposite the car and monitors the speed of the car based on the read code. By adopting an electronic safety device, it is possible to reduce the labor required for installation of the safety device compared to a mechanical safety device.

[0003] However, simply replacing a mechanical governor with an electronic governor requires an electronic governor on both the car side and the counterweight side, which means that the benefit of reduced installation labor cannot be fully utilized. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-126164 A Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the embodiments is to provide an elevator control system and an elevator control method that can effectively reduce the labor required for installing a safety device. [Means for solving the problem]

[0006] An elevator control system according to an embodiment includes a structure, a sensor, a calculation unit, and an operation unit. The structure extends along an elevator shaft, and position information indicating an absolute position is disposed thereon. The sensor is installed in the car and reads the position information disposed on the structure. The calculation unit calculates both the speed of the car and the speed of the counterweight based on the position information read by the sensor. The operation unit activates a first safety device provided in the car and a second safety device provided in the counterweight based on the speed of the car and the speed of the counterweight calculated by the calculation unit. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an elevator apparatus equipped with an elevator control system according to this embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of the configuration of a rope breakage detection device of the elevator system shown in FIG. [Diagram 3] FIG. 3 is a diagram showing a configuration example of an emergency stop device of the elevator apparatus shown in FIG. [Figure 4] FIG. 4 is a block diagram showing an elevator control system according to this embodiment. [Diagram 5] FIG. 5 is a flowchart showing an example of the operation of the elevator control system according to this embodiment. [Figure 6] FIG. 6 is a flowchart showing the details of the process of measuring the speeds of the car and the counterweight in the flowchart of FIG. [Figure 7] FIG. 7 is a flowchart showing an operation example of the elevator control system following FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiment. In addition, in the drawings referred to in the embodiment, the same parts or parts having similar functions are denoted by the same or similar reference numerals, and repeated description thereof will be omitted.

[0009] As shown in FIG. 1, the elevator control system 10 is mounted on an elevator device 1 and can be used, for example, for the safe operation of the elevator device 1. The elevator device 1 includes a car 3 that can ascend and descend in a hoistway 2, and a counterweight 4 connected (i.e., coupled) to the car 3 via a main rope 5. The main rope 5 is wound around a main sheave 6a and a cambered sheave 7 provided on a hoisting machine 6. The car 3 and the counterweight 4 may be connected via a plurality of main ropes 5. The hoisting machine 6 winds up the main rope 5, causing the car 3 and the counterweight 4 to ascend and descend. In the example shown in FIG. 1, the hoisting machine 6 is disposed at the upper part of the hoistway 2. The hoisting machine 6 is not limited to such a configuration, and may be disposed in a machine room provided above the hoistway 2. The lower part of the car 3 and the lower part of the counterweight 4 are connected by a compensating rope 8. The compensating rope 8 corrects the imbalance between the weight applied to the main rope 5 on the car 3 side and the weight applied to the main rope 5 on the counterweight 4 side. The compensating rope 8 is wound around a compensating sheave 9.

[0010] The elevator control system 10 includes an electronic governor 20, a first safety device 32 provided in the car 3, and a second safety device 42 provided in the counterweight 4. The electronic governor 20 is a device that electronically monitors the speeds of the car 3 and the counterweight 4. The electronic governor 20 can also be called an electronic governor or a safety device. The electronic governor 20 includes a tape 12, a sensor 31, and a control panel 50. The tape 12 is an example of a structure.

[0011] The tape 12 is arranged so as to extend along the elevator shaft 2 of the elevator device 1. That is, the tape 12 is arranged facing the car 3 along the ascending and descending direction of the car 3. Position information 12a indicating an absolute position (i.e., height) is arranged on the tape 12. Although only one piece of position information 12a is representatively shown in FIG. 1, in reality, a plurality of pieces of position information 12a are arranged along the longitudinal direction of the tape 12. The position information 12a is, for example, a position code printed on the surface of the tape 12 on the car 3 side. The position code may be, but is not limited to, a two-dimensional code indicating an absolute position such as a barcode or a gray code. Instead of arranging the position information 12a on the tape 12, the position information 12a may be arranged on a guide rail that guides the running of the car 3.

[0012] The sensor 31 is installed in the car 3. The sensor 31 is not installed in the counterweight 4. In the example shown in FIG. 1, the sensor 31 is arranged in the vicinity of the tape 12 on the upper part of the car 3 (i.e., the upper surface of the ceiling). The sensor 31 optically reads the position information 12a arranged on the tape 12. The sensor 31 outputs the read position information 12a (i.e., data acquired by reading the position information 12a) to the control panel 50. For example, the sensor 31 is a camera that captures the position information 12a. The control panel 50 monitors the speed of the car 3 and the counterweight 4 based on the position information 12a read by the sensor 31, and controls the emergency stop of the car 3 and the counterweight 4. In the example shown in FIG. 1, the control panel 50 is arranged in the elevator 2. The present invention is not limited to such a configuration, and the control panel 50 may be arranged in a machine room, for example.

[0013] The first safety device 32 is provided at the bottom of the car 3. The first safety device 32 brings the car 3 to an emergency stop in accordance with the control by the control panel 50 according to the monitoring result of the speed of the car 3. That is, the first safety device 32 brings the car 3 to an emergency stop in accordance with an electric signal transmitted from the control panel 50 in accordance with the speed of the car 3.

[0014] The second safety device 42 is provided below the counterweight 4. The second safety device 42 brings the counterweight 4 to an emergency stop under the control of the control panel 50 based on the monitored speed of the counterweight 4. That is, the second safety device 42 brings the counterweight 4 to an emergency stop under the electric signal transmitted from the control panel 50 based on the speed of the counterweight 4.

[0015] 1, a rope breakage detection device 41 is provided on the upper part of the counterweight 4. The rope breakage detection device 41 detects a breakage of the main rope 5, and outputs the detection result to the control panel 50.

[0016] The control panel 50 is electrically connected to the electrical equipment mounted on the car 3 via the tail cord 11. The control panel 50 controls the operation of the electrical equipment mounted on the car 3. For example, the control panel 50 controls the operation of the first safety device 32 and the sensor 31 mounted on the car 3. In addition, the control panel 50 also controls the operation of the door opening and closing mechanism mounted on the car 3. The control panel 50 is also electrically connected to the hoisting machine 6 via wiring (not shown). The control panel 50 controls the operation of the hoisting machine 6. Furthermore, the control panel 50 is electrically connected to the electrical equipment mounted on the counterweight 4. Specifically, the control panel 50 is electrically connected to the second safety device 42 and the rope breakage detection device 41 mounted on the counterweight 4. The control panel 50 controls the operation of the second safety device 42.

[0017] For example, the control panel 50 may be electrically connected to an electrical device mounted on the counterweight 4 via the tail cord 11 and a power transmission line (not shown) in the main rope 5. In this case, the tail cord 11 and the power transmission line in the main rope 5 function as a power supply unit that supplies power (including an electrical signal) to the second emergency stop device 42. In addition to this, the power supply device 13 shown in FIG. 1 may be installed as a power supply unit that supplies power to the second emergency stop device 42. The power supply device 13 is installed in the hoistway 2 facing the counterweight 4. A plurality of power supply devices 13 may be installed along the hoistway 2. The power supply device 13 wirelessly supplies power to the second emergency stop device 42 under the control of the control panel 50. For example, the power supply device 13 may wirelessly supply power to the second emergency stop device 42 by electromagnetic induction using a power supply coil provided in the power supply device 13 and a power receiving coil provided in the second emergency stop device 42. The power supply device 13 may be configured to transmit an electric signal to the second safety device 42 to activate the second safety device 42 in a state in which all the main ropes 5 (i.e., power transmission lines) are broken, in accordance with the control of the control panel 50. Alternatively, the power supply unit that supplies power to the second safety device 42 may be configured by the tail cord 11 and a second tail cord (not shown) provided between the lower part of the car 3 and the lower part of the counterweight 4.

[0018] The rope breakage detection device 41 will be described in more detail. In the example shown in FIG. 2, the rope breakage detection device 41 is disposed in the rope hitch portion 15 that connects the main rope 5 to the counterweight 4. The rope breakage detection device 41 includes a compression spring 41a, a first plate 41b, a second plate 41c, and a switch 41d. The upper end of the compression spring 41a is fixed to the first plate 41b. The counterweight 4 is connected to the first plate 41b. The lower end of the compression spring 41a is fixed to the second plate 41c. The lower end of the main rope 5 is fixed to the second plate 41c, penetrating the first plate 41b and the compression spring 41a. The switch 41d is fixed to the second plate 41c. In this configuration, the weight of the counterweight 4 acts on the first plate 41b. The tension of the main rope 5 acts on the second plate 41c. In normal operation when the main rope 5 is not broken, the compression spring 41a is held in a compressed state by the tension of the main rope 5 and the mass of the counterweight 4. By holding the compression spring 41a in a compressed state, the first plate 41b and the second plate 41c are held in a close state. By holding the first plate 41b and the second plate 41c in a close state, the switch 41d is held in an ON state. On the other hand, when the main rope 5 breaks, the weight of the counterweight 4 no longer acts, and the compressed compression spring 41a is released (i.e., expanded). By releasing the compression spring 41a, the first plate 41b and the second plate 41c are separated from each other, and the switch 41d is turned off. The control panel 50 can detect the breakage of the main rope 5 by electrically detecting the OFF state of the switch 41d.

[0019] The first safety device 32 will be described in more detail. In the example shown in FIG. 3, the first safety device 32 includes a roller 32a, an actuator 32b, a friction material 32c, and a spring 32d. The roller 32a is rotatably arranged near the side of the guide rail 16 that guides the elevator car 3. The roller 32a can be moved linearly by the actuator 32b in a direction to contact the guide rail 16 and in a direction to move away from the guide rail 16. The friction material 32c is arranged at a position facing the roller 32a with the guide rail 16 therebetween. The spring 32d applies an elastic force toward the guide rail 16 to the friction material 32c. The actuator 32b may be configured to move the roller 32a toward the guide rail 16 in response to energization of a solenoid (not shown), for example. In this configuration, the actuator 32b causes the roller 32a to press the guide rail 16 in response to an input of an electric signal (i.e., energization) from the control panel 50. When the roller 32a presses the guide rail 16, the guide rail 16 is sandwiched between the roller 32a and the friction material 32c. When the guide rail 16 is sandwiched between the roller 32a and the friction material 32c, the car 3 stops. The configuration of the second safety device 42 is similar to the configuration of the first safety device 32 shown in FIG.

[0020] The control panel 50 will now be described in more detail. As shown in FIG.

[0021] The calculation unit 51 calculates both the speed of the car 3 and the speed of the counterweight 4 based on the position information 12a read by the sensor 31. Specifically, the calculation unit 51 calculates the same speed as the speed of the car 3 as the speed of the counterweight 4. Here, if the main rope 5 is not completely broken, the counterweight 4 connected to the car 3 via the main rope 5 can be considered to be moving in the opposite direction to the car 3 at the same speed as the car 3 (i.e., the speed has the same absolute value). Therefore, the calculation unit 51 can calculate the same speed as the speed of the car 3 as the speed of the counterweight 4. Note that the specific manner of calculating the speed based on the read result of the position information 12a is not particularly limited. For example, the calculation unit 51 may calculate the speed at which the read absolute position changes based on the position information 12a read by the sensor 31. Then, the calculation unit 51 may determine the speed at which the calculated absolute position changes as the speed of the car 3 and the counterweight 4.

[0022] The actuation unit 52 actuates the first safety device 32 provided on the car 3 and the second safety device 42 provided on the counterweight 4 based on the speed of the car 3 and the speed of the counterweight 4 calculated by the calculation unit 51. The actuation unit 52 actuates the first safety device 32 and the second safety device 42 by transmitting an electric signal to the first safety device 32 and the second safety device 42. The transmission of the electric signal from the actuation unit 52 to the first safety device 32 is performed by wire via the tail cord 11. The transmission of the electric signal from the actuation unit 52 to the second safety device 42 may be performed by wire via the tail cord 11 and the power transmission line in the main rope 5 as the above-mentioned power supply unit. Alternatively, the transmission of the electric signal from the actuation unit 52 to the second safety device 42 may be performed wirelessly via the power supply device 13 as the power supply unit. Alternatively, the transmission of an electrical signal from the operating unit 52 to the second safety device 42 may be performed by wire via the tail cord 11 and a second tail cord connecting the lower part of the car 3 and the lower part of the counterweight 4.

[0023] The power cutoff unit 53 cuts off the power supply to the hoist 6 that winds up the main rope 5 connecting the car 3 and the counterweight 4 when the speeds of the car 3 and the counterweight 4 calculated by the calculation unit 51 reach a switch operation speed. The switch operation speed is the speed of the car 3 and the counterweight 4 when a switch that switches between supplying and cutting off power to the hoist 6 should be operated to the cutoff side. The switch operation speed is an example of a first threshold speed. More specifically, when a break in the main rope 5 is not detected by the rope break detection device 41 installed in the rope hitch portion 15 of the counterweight 4, the power cutoff unit 53 cuts off the power supply to the hoist 6 when the speeds of the car 3 and the counterweight 4 calculated by the calculation unit 51 reach the switch operation speed. In response to the cutoff of the power supply to the hoist 6, a brake (not shown) provided in the hoist 6 is operated to stop the rotation of the hoist 6.

[0024] The operation unit 52 operates the first safety device 32 or the second safety device 42 when the speed of the car 3 and the speed of the counterweight 4 calculated by the calculation unit 51 do not decrease to zero after the power supply is cut off by the power supply cutoff unit 53. A speed of zero is an example of a second threshold speed that is lower than the first threshold speed. Specifically, when the car 3 is descending, the operation unit 52 operates the first safety device 32 mounted on the car 3. On the other hand, when the car 3 is ascending, the operation unit 52 operates the second safety device 42 mounted on the counterweight 4.

[0025] When the rope breakage detection device 41 detects a breakage of the main rope 5, the calculation unit 51 calculates the acceleration of the car 3 based on the position information 12a read by the sensor 31. The specific manner of calculating the acceleration based on the result of reading the position information 12a is not particularly limited. For example, the calculation unit 51 may calculate the rate of change per unit time of the speed at which the read absolute position changes based on the position information 12a read by the sensor 31. Then, the calculation unit 51 may determine the calculated rate of change as the acceleration of the car 3. When the acceleration of the car 3 calculated by the calculation unit 51 reaches a threshold acceleration, the operation unit 52 activates the first safety device 32 and the second safety device 42. The threshold acceleration may be, for example, 1 G, that is, the acceleration of gravity (9.8 m / s 2 In this case, the operating unit 52 detects that the car 3 and the counterweight 4 are falling freely due to the complete breakage of the main rope 5, and activates the first safety device 32 and the second safety device 42.

[0026] Next, an operation example of the above-mentioned elevator control system 10 will be described. As shown in Fig. 5, first, the control panel 50 of the electronic governor 20 judges whether or not the rope breakage detection device 41 is not operating (step S1). That is, the control panel 50 judges whether or not breakage of one or more main ropes 5 has been detected.

[0027] If the rope breakage detection device 41 is not operating (step S1: Yes), the calculation unit 51 of the control panel 50 measures the speeds of the car 3 and the counterweight 4 (step S2). That is, the calculation unit 51 starts continuous calculation of the speeds of the car 3 and the counterweight 4.

[0028] 6, first, the calculation unit 51 causes the sensor 31 to read the position information 12a printed on the tape 12 (step S21). If the sensor 31 is a camera, the sensor 31 captures an image of the position information 12a printed on the tape 12, converts the captured image into an electrical signal (i.e., image data), and outputs the electrical signal to the calculation unit 51.

[0029] After the position information 12a is read, the calculation unit 51 calculates the speed of the car 3 and the speed of the counterweight 4 based on the read position information 12a (step S22).

[0030] After the speeds of the car 3 and the counterweight 4 are measured, as shown in FIG. 5, the power cutoff unit 53 of the control panel 50 cuts off the power to the hoist 6 when the measured speeds of the car 3 and the counterweight 4 reach a switch operating speed (step S3).

[0031] After the power supply to the hoist 6 is cut off, the operation unit 52 of the control panel 50 determines whether the car 3 has stopped (step S4). That is, the operation unit 52 determines whether the speed of the car 3 calculated by the calculation unit 51 has decreased to zero.

[0032] If the car 3 stops (step S4: Yes), the process ends. On the other hand, if the car 3 does not stop (step S4: No), the operation unit 52 determines whether the car 3 is moving downward (step S5). For example, the operation unit 52 may determine whether the car 3 is moving downward based on whether the absolute position indicated in the position information 12a read by the sensor 31 has changed from a high position to a low position. Without being limited to such a configuration, for example, the operation unit 52 may determine whether the car 3 is moving downward based on the contents of the drive control of the hoist 6 (i.e., the rotation direction of the hoist 6) immediately before the power supply of the hoist 6 is cut off.

[0033] If the car 3 is moving downward (step S5: Yes), the operation unit 52 activates the first emergency stop device 32 (step S6) when the speed of the car 3 reaches a catch operation speed that should bring the car 3 to an emergency stop.

[0034] On the other hand, if the car 3 is not moving downward (step S5: No), i.e., if the car 3 is moving upward, the operating unit 52 activates the second emergency stop device 42 when the speed of the balancing weight 4, which is equal to the speed of the car 3, reaches a catch operation speed that should bring the balancing weight 4 to an emergency stop (step S7).

[0035] On the other hand, if the rope break detection device 41 is operating (step S1: No), as shown in FIG. 7, the power cut-off unit 53 of the control panel 50 cuts off the power supply to the hoisting machine 6 in response to detection of a break in the main rope 5 by the rope break detection device 41 (step S8).

[0036] After the power supply of the hoist 6 is cut off, the calculation unit 51 of the control panel 50 measures the speeds of the car 3 and the counterweight 4 (step S9). That is, the calculation unit 51 starts to continuously calculate the speeds of the car 3 and the counterweight 4. Specifically, as shown in FIG. 6, the calculation unit 51 makes the sensor 31 read the position information 12a printed on the tape 12 (step S21). After the position information 12a is read, the calculation unit 51 calculates the speed of the car 3 and the speed of the counterweight 4 based on the read position information 12a (step S22).

[0037] After the speed of the car 3 and the speed of the counterweight 4 are measured, the operation unit 52 of the control panel 50 determines whether the car 3 has stopped (step S10). That is, the operation unit 52 determines whether the speed of the car 3 calculated by the calculation unit 51 has decreased to zero.

[0038] If the car 3 has stopped (step S10: Yes), the process ends. On the other hand, if the car 3 has not stopped (step S10: No), the operation unit 52 determines whether the car 3 is moving upward (step S11). For example, the operation unit 52 may determine whether the car 3 is moving upward based on whether the absolute position indicated in the position information 12a read by the sensor 31 has changed from a lower position to a higher position.

[0039] When the car 3 is moving upward (step S11: Yes), it is considered that the car 3 and the counterweight 4 are connected by an unbroken main rope 5 among the multiple main ropes 5. In this case, the operating unit 52 activates the second safety device 42 of the counterweight 4 (step S12).

[0040] After activating the second safety device 42, the operation unit 52 determines whether or not the car 3 has stopped (step S13).

[0041] If the car 3 stops (step S13: Yes), the process ends. On the other hand, if the car 3 does not stop (step S13: No), it is considered that the main ropes 5 that were not broken at the time of step S11 have subsequently broken. In other words, it is considered that all the main ropes 5 have broken and the car 3 has fallen. In this case, the operating unit 52 activates the first safety device 32 of the car 3 when the speed of the car 3 reaches the catching operation speed (step S14).

[0042] On the other hand, if the car 3 is not moving upward (step S11: No), the calculation unit 51 calculates the acceleration of the car 3, which is the rate of change of the speed of the car 3 per unit time. The operation unit 52 determines whether the car 3 is moving downward with an acceleration of 1G, that is, the gravitational acceleration, based on the calculated acceleration of the car 3 (step S15). That is, the operation unit 52 determines whether all the main ropes 5 are completely broken and the car 3 is falling freely.

[0043] If the car 3 is moving downward at an acceleration of 1G (step S15: Yes), the operation unit 52 activates the first safety device 32 when the speed of the car 3 reaches the catching operation speed (step S16).

[0044] After activating the first safety device 32, the operating unit 52 activates the second safety device 42 (step S17). That is, since it is considered that the counterweight 4 is also falling freely when the car 3 is falling freely, the second safety device 42 brings the counterweight 4 to an emergency stop.

[0045] On the other hand, if the car 3 is not moving downward at an acceleration of 1G (step S15: No), it is considered that the car 3 and the counterweight 4 are connected by the main rope 5 that is not broken among the multiple main ropes 5, and braking deceleration or the like is being applied. In this case, the operating unit 52 activates the first safety device 32 and does not activate the second safety device 42 (step S18).

[0046] As described above, according to the elevator control system 10 of this embodiment, the sensor 31 installed in the car 3 reads the position information 12a arranged on the tape 12. The calculation unit 51 calculates both the speed of the car 3 and the speed of the counterweight 4 based on the position information 12a read by the sensor 31. The operation unit 52 activates the first safety device 32 provided in the car 3 and the second safety device 42 provided in the counterweight 4 based on the speed of the car 3 and the speed of the counterweight 4 calculated by the calculation unit 51.

[0047] This allows the speeds of both the car 3 and the counterweight 4 to be monitored by the sensor 31 installed in the car 3. In other words, emergency stops of both the car 3 and the counterweight 4 can be controlled without the need to install the sensor 31 in the counterweight 4. This eliminates the need to install the sensor 31 in the counterweight 4, effectively reducing the labor required to install the electronic governor 20 (i.e., the safety device). In addition, this also eliminates the labor required to maintain the sensor 31 installed in the counterweight 4, effectively reducing the labor required to maintain the electronic governor 20.

[0048] Furthermore, according to the elevator control system 10 of this embodiment, the power cut-off unit 53 cuts off the power supply to the hoist 6 that winds up the main rope 5 connecting the car 3 and the counterweight 4 when the speeds of the car 3 and the counterweight 4 calculated by the calculation unit 51 reach the switch operation speed. Furthermore, the operation unit 52 activates the first safety device 32 or the second safety device 42 when the speeds of the car 3 and the counterweight 4 calculated by the calculation unit 51 do not decrease to zero after the power cut-off unit 53 cuts off the power supply.

[0049] This ensures an opportunity to stop the car 3 and the counterweight 4 by cutting off the power supply to the hoisting machine 6, thereby making it possible to shorten the time required for the elevator equipment 1 to return to normal operation compared to when the emergency stop devices 32, 42 are immediately activated.

[0050] Furthermore, according to the elevator control system 10 of this embodiment, the operating unit 52 activates the first emergency stop device 32 when the car 3 is descending, and activates the second emergency stop device 42 when the car 3 is ascending.

[0051] This allows the appropriate safety devices 32, 42 to be activated depending on the traveling direction of the car 3.

[0052] Furthermore, according to the elevator control system 10 of this embodiment, if no breakage of the main rope 5 is detected by the rope breakage detection device 41 installed in the rope hitch portion 15 of the counterweight 4, the power supply cut-off unit 53 cuts off the power supply to the hoisting machine 6 when the speed of the car 3 and the speed of the counterweight 4 calculated by the calculation unit 51 reach the switch operating speed.

[0053] This makes it possible to appropriately secure an opportunity to stop the car 3 and the counterweight 4 by cutting off the power supply to the hoist 6 in a situation where the car 3 and the counterweight 4 may stop due to a cutoff in the power supply to the hoist 6, such as when the main rope 5 is not broken. As a result, it is possible to shorten the time required for the elevator device 1 to return to normal operation, compared to a case where the emergency stop devices 32, 42 are immediately activated when the main rope 5 is not broken.

[0054] Furthermore, according to the elevator control system 10 of this embodiment, when the rope breakage detection device 41 detects a breakage of the main rope 5, the calculation unit 51 calculates the acceleration of the car 3 based on the position information 12a read by the sensor 31. Furthermore, when the acceleration calculated by the calculation unit 51 reaches a threshold acceleration, the operation unit 52 activates the first safety device 32 and the second safety device 42.

[0055] As a result, when the main rope 5 breaks completely and the car 3 and the counterweight 4 are falling freely, the first safety device 32 and the second safety device 42 can be operated appropriately.

[0056] Furthermore, according to the elevator control system 10 of this embodiment, the operation unit 52 operates the first emergency stop device 32 and the second emergency stop device 42 by transmitting an electrical signal to the first emergency stop device 32 and the second emergency stop device 42.

[0057] This allows the first emergency stop device 32 and the second emergency stop device 42 to be electrically controlled, allowing the easy-to-install electronic governor 20 to function properly in operating the first emergency stop device 32 and the second emergency stop device 42.

[0058] Moreover, the elevator control system 10 of the present embodiment further includes a power supply unit (that is, the tail cord 11, the power transmission line in the main rope 5, the power supply device 13, etc.) that supplies power to the second safety device .

[0059] This allows the electronic governor 20 to appropriately electrically control the second safety device 42.

[0060] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention. [Explanation of symbols]

[0061] REFERENCE SIGNS LIST 1 elevator device, 10 elevator control system, 3 car, 31 sensor, 32 first emergency stop device, 4 counterweight, 41 rope breakage detection device, 42 second emergency stop device, 5 main rope, 51 calculation unit, 52 operation unit, 53 power supply cutoff unit, 6 hoisting machine

Claims

1. A structure extending along an elevator shaft and having position information indicating an absolute position arranged thereon; A sensor that is installed in a car and reads the position information arranged in the structure; A calculation unit that calculates both a speed of the car and a speed of a counterweight based on the position information read by the sensor; an operating unit that operates a first safety device provided in the car and a second safety device provided in the counterweight based on the speed of the car and the speed of the counterweight calculated by the calculation unit; An elevator control system comprising:

2. Further provided is a power cut-off unit that cuts off a power supply to a hoist that winds up a rope connecting the car and the counterweight when the speed of the car and the counterweight calculated by the calculation unit reach a first threshold speed, 2. The elevator control system according to claim 1, wherein the operation unit activates the first emergency stop device or the second emergency stop device when the speed of the car and the speed of the counterweight calculated by the calculation unit do not decrease to a second threshold speed that is lower than the first threshold speed after the power supply is cut off by the power supply cut-off unit.

3. 3. The elevator control system according to claim 2, wherein the operating unit activates the first emergency stop device when the car is descending, and activates the second emergency stop device when the car is ascending.

4. 4. The elevator control system according to claim 2 or 3, wherein the power supply cut-off unit cuts off the power supply to the hoist when the speed of the car and the speed of the counterweight calculated by the calculation unit reach the first threshold speed if a break in the rope is not detected by a break detection device installed in a rope hitch portion of the counterweight.

5. The calculation unit calculates an acceleration of the car based on the position information read by the sensor when the breakage detection device detects a breakage of the rope, The elevator control system according to claim 4 , wherein the operation unit activates the first safety device and the second safety device when the acceleration calculated by the calculation unit reaches a threshold acceleration.

6. The elevator control system according to any one of claims 1 to 3, wherein the actuation unit actuates the first emergency stop device and the second emergency stop device by transmitting an electrical signal to the first emergency stop device and the second emergency stop device.

7. The elevator control system according to any one of claims 1 to 3, further comprising a power supply unit that supplies power to the second emergency stop device.

8. A step of reading position information indicating an absolute position arranged on a structure extending along the elevator shaft by a sensor installed in the elevator car; Calculating both the speed of the car and the speed of a counterweight based on the position information read by the sensor; activating a first safety device provided on the car and a second safety device provided on the counterweight based on the calculated speeds of the car and the counterweight; An elevator control method comprising:

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