WO2004031064A1

WO2004031064A1 - Elevator system

Info

Publication number: WO2004031064A1
Application number: PCT/JP2002/010368
Authority: WO
Inventors: Hiroshi Nagase; Atsuya Fujino; Toshisuke Mine; Hiromi Inaba; Osamu Okuni
Original assignee: Hitachi, Ltd.
Priority date: 2002-10-04
Filing date: 2002-10-04
Publication date: 2004-04-15
Also published as: JPWO2004031064A1

Abstract

An elevator system capable of reducing chances of damages of device and chances of troubles in restoration even when the buffer length is reduced. This elevator system comprises a means for setting a first set speed which varies according to the position of a cage in a hoistway, a means for setting a second set speed which is higher than the first set speed, and varies according to the position of the cage in the hoistway, a mechanical brake which is operated when the cage speed of the elevator exceeds the first set speed, and an emergency stopper which is operated when the cage speed of the elevator exceeds the second set speed.

Description

Specification

Elevator system

Technology field

The present invention relates to an elevator system capable of reducing the length of an elevator hoistway.

Background art

In general, a buffer corresponding to the rated speed of the elevator is provided at the bottom of the hoistway in case of an elevator in case of emergency. The acceleration at the time of deceleration stop by this buffer is a constant value from the viewpoint of safety, so the buffer length increases as the rated speed of the elevator increases. For this reason, there is a problem that the shaft pit depth becomes deep. Japanese Patent Application Laid-Open Publication No. 2000-3505372 is a conventional technique for dealing with this. This publication describes that the governor operating speed is changed at the upper and lower ends of the hoistway to reduce the speed at which the car collides with the buffer during an emergency stop. Disclosure of Invention ·

Japanese Patent Application Laid-Open Publication No. 2001-35453072 only states that the emergency stop device is operated by operating the governor for the overspeed of the car. As a result, it is considered that the governor is operated more frequently, and there is more chance of damage to the traveling rail due to the operation of the emergency stop device. In addition, there is a problem that the opportunity to take time to return increases. Therefore, the present invention provides an elevator system that can reduce the chances of damaging equipment and reducing the time and effort required to recover even if the buffer length is reduced. The purpose is to provide.

Therefore, the present invention provides a means for setting a first set speed that is different depending on the position of a car in a hoistway, a speed higher than the first set speed, and a car in a hoistway. Means for setting a second setting speed that varies depending on the position; mechanical brakes that operate when the elevator car speed exceeds the first setting speed; and elevator single riding. An emergency stop device that operates when the car speed exceeds the second set speed is provided.

Since the mechanical brake is activated before the safety gear operates, even if the set speed at which the safety gear operates is lower at the top and bottom of the hoistway than at the middle of the hoistway, the safety gear is used. This can reduce the chances of the device operating and reduce the chances of damaging the equipment. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram showing an entire embodiment of the present invention. FIG. 2 is a diagram showing the configuration of the drive control device 7 and the speed abnormality monitoring control device 101. FIG. 3 is a diagram showing a set speed set in the present embodiment. FIG. 4 is a flowchart showing the operation of the present embodiment. FIG. 5 is a diagram showing the operation of this embodiment at a set speed. FIG. 6 is a diagram for explaining the effect of the present embodiment. FIG. 7 is a diagram showing a set speed different from FIG. FIG. 8 is a diagram showing another set speed different from FIG. FIG. 9 is an operation explanatory view showing another embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the elevator system of the present invention will be described with reference to the drawings. explain.

FIG. 1 is a configuration diagram showing the entire embodiment of the present invention.

In this figure, car 1 is suspended by rope 4. The rope 4 passes from the car 1 through the sheave 32 and the deflecting wheel 33 to the counterweight 2. The car 1 ascends and descends in the hoistway 6 along the traveling rail 5 when the sheaves 32 are driven by the motor 31. The running rail of the counterweight 2 is omitted. Motor 31 is attached to the shaft end of sheave 32. The driving machine 3 including the motor 31, the sheave 32, the mechanical brake 34, etc. operates by receiving power supply from the drive control device 7. In normal operation, car 1 moves up and down between required floors in response to call signals issued in car 1 and on floors 201, 202, 200, and -210. . In this example, the floor of the landing has 10 floors from 201 to 210.

The speed abnormality monitoring control device 101 detects the position and speed of the car 1 in the hoistway 6. Also, set the first set speed and the second set speed. If the car speed is higher than the first set speed, the drive control device 7 stops driving the motor 31 and sends a signal to apply a brake using the brake 34 provided at the shaft end of the motor 31. Send. A machine room 9 is provided at the top of the hoistway 6, where the governor 102 is installed. The governor 102 is connected to an emergency stop device 105 provided in the car 1 via a governor rope 10'4 and a reverse governor pulley 103. The governor 102 can freely set its operation speed, and this value is set as a second set value from the speed abnormality monitoring control device 101. When the speed of the car exceeds the second set speed, which will be described later, the governor 102 operates the emergency stop device 103 via the governor rope 104 in the same manner as ordinary governor. When the emergency stop device 103 is operating, press the rail 5 to apply the brake. Multiply. In addition, a buffer 106 is provided below the hoistway 6. The brake 34 is a mechanical brake provided in the car other than the emergency stop device or a mechanical brake that outputs a force for stopping the rotation of the sheave 32 and the motor 31.

FIG. 2 is a diagram showing a configuration of the drive control device 7 and the speed abnormality monitoring control device 101.

The control device 71 performs control for executing the speed control of the car 1, and the inverter (INV) 72 outputs a voltage and a frequency to the motor 31 based on a signal of the control device 71. The brake control device 73 applies a voltage to the brake 34 during operation according to the signal of the control device 71 to release the brake. In other words, when stopping or when it is desired to stop by the brake, the application of the voltage to the brake 34 may be stopped. Control of the position and speed of the car 1 by the control device 71 is performed by a signal from an encoder 331 attached to the shaft end of the motor 31 and a shield plate indicating a car stop position in the hoistway 6. The speed Z position detector 1 1 1 detects the position and speed of the car 1 based on a signal from the encoder 33 1 and a signal from the shield plate different from the drive control device 7. In addition, the pattern generator / comparator 1 1 2 generates a set speed according to the position of the car 1 from the signal indicating the end floor, in addition to the above signals, and Judge whether the speed is higher or lower than the pattern. Pattern generation Control the brake controller 73 and set the governor operation speed based on the output of the Z comparator 112.

Next, the operation that is a feature of the present invention will be described with reference to FIG.

The speed abnormality monitoring control device 101 detects the position and speed of the car 1 in the hoistway, the specified speed A according to the car position, the first set speed B slightly larger than it, and the second speed larger than this. To generate the set speed. Fig. 2 is specified FIG. 5 is a basic operation explanatory diagram showing a relationship between a speed A, a first set speed B, and a second set speed C. At the position of the end floor 201 at the lower end of the hoistway, the specified speed A is almost zero. When car 1 departs from end floor 201 at the lower end, the car speed gradually increases at the set speed, and reaches the rated constant speed. Then, the speed is reduced near the upper end floor 210, and the speed becomes zero at the upper end floor 210. In other words, the specified speed A is the specified jerk and acceleration from the lower floor (upper end) at the lower floor (201) to the upper floor (lower end) at the lower floor (210). , This is the set speed of car 1 when traveling at the rated speed. Set speed B is set higher than specified speed A, and set speed C is set higher than set speed B. The speed has both upward and downward directions, but here it is expressed as its absolute value (magnitude).

FIG. 4 is a flowchart showing the operation of the present embodiment.

Step 1 101 is the operation by the speed abnormality monitoring control device 101, Step 1 102 is the operation by the drive control device 7, Step 1 103 is the operation by the governor 102 and the emergency stop device 105 It is. In operation, the position and speed of the car are detected in step 101. Next, in step 1002, a first set speed B and a second set speed C shown in FIG. 3 are generated according to the car position. Then, in step 1003, the second set speed is set to the governor 102. On the other hand, in step 1004, the car speed detected in step 1001 is compared with the first set speed generated in step 1002. If the car speed does not exceed the first set speed, the car is operating normally according to the speed command, or the speed is in the low range for some reason. Continue normal operation with device 7. If the car speed exceeds the first set speed, the car is overspeeding without responding to the speed command. Issue an emergency braking operation signal. In response to this, step 101 stops driving of the motor 31 and operates the brake 34. As a result, the car stops at a predetermined acceleration due to the brake operation in step 103. The second set speed set in step 1003 is compared with whether the car speed exceeds the second set speed in step 1021. If not, the car is operating normally in accordance with the speed command, or the speed is in the low speed range for some reason, so that normal operation by the drive control device 7 is continued in step 1011. If the car speed exceeds the second set value, the car speed is overspeed without corresponding to the speed command, so the governor 102 is operated in step 102 and the emergency stop Operate the unit 105. As a result, in step 1023, the car stops at a predetermined acceleration due to the operation of the safety gear. The operation whether the car speed exceeds the first set speed or the second set speed is continuously performed as long as the car is operated.

In this way, if the car overspeeds from the speed command, it will stop safely. As can be seen from the operation description, the feature of the present embodiment is that the determination whether the car speed has exceeded the first set speed and the determination whether the car speed has exceeded the second set speed are performed in parallel. It is in. For this reason, the abnormality judgment and the operation at the time of the abnormality are performed in parallel, and the safety is greatly enhanced. Further, since the first set speed is set lower than the second set speed, the operation based on the first set speed comparison is prioritized, and the possibility that the operation based on the second set speed comparison occurs is small.

In the above embodiment, the operation flow of FIG. 4 has been described as being performed as a set of operations of individual devices, but the operation of the speed abnormality monitoring control device 101 is performed in the drive control device 7. Judgment and operation of governor 102 Can be performed by the drive control device 7. At this time, the operation can be performed by hardware logic or software logic. When integrating the device operations, it is desirable to take measures to avoid interference with other operation and control operations from the viewpoint of the reliability of the safety system.

The first set speed B is set in consideration of the deviation from the speed command of car 1 that should run at specified speed A, the speed detection error of car 1 and detection delay. The second set speed C is set in consideration of the judgment time until the emergency brake is applied to the machine 3 when the first set speed B is exceeded and the increase of the car speed due to the operation delay. . Conversely, since the governor operation of the second set speed C is determined to be, for example, about 120% with respect to the specified speed, the first set speed B can be determined from the backward calculation.

Examples of such governors include a governor with a structure that can change the operating point mechanically, and a governor that performs electrical operation. A specific example of the latter is a structure in which the speed of a car is directly or indirectly detected as a rotation speed, and a signal proportional to the rotation speed, for example, the car speed is measured by an induced voltage, and the operation speed is changed. Can be obtained.

In the above embodiment, the governor is installed in the machine room. However, the governor can be installed in the hoistway or in the car itself. In the example where the car is installed in a car, it can be applied to an elevator system in which multiple cars are arranged in a hoistway.

The specified speed, the first set speed, and the second set speed set above may be determined in advance.

Figure 5 shows the car speed in the event of a car overspeed near the floor 202. In the figure, the dashed line D is the actual speed of the car when the car departs downward from the floor 210 at the upper end. In the figure Up to the point a, the vehicle is driven almost at the specified speed A, and an overspeed occurs at the point a. At this time, when the first set speed b point is reached, as shown in the operation flow of FIG. 4, the operations after step 105 are performed, and the car safely stops at the point c. In the unlikely event that step 1005 is not performed at point b, the operations after step 1022 are performed at point d, and the operation safely stops at point e.

As described above, the emergency stop is safely stopped. At this time, since the first set speed operates with priority, the possibility that the safety gear operates will be small. For this reason, there is the advantage that the rail is not damaged when the safety device is activated, and no effort is required to release it. In addition, the safety measures are high because the response to speed abnormalities is dual.

In addition, in the event of an overspeed operation of the car, the speed at which the car collides with the buffer on the floor 201 at the end of the floor normally requires a buffer capacity at the rated speed. The collision speed is less than α, as shown by, and the collision speed of the buffer can be greatly reduced from the rating. For this reason, the hoistway pit depth and overhead dimensions can be significantly reduced, which is a significant effect in reducing the hoistway length. Fig. 6 shows a case of a normal type elevator where the governor always operates at a constant speed. In FIG. 6, the same reference numerals as those in FIG. 1 indicate the same items. The governor 301 in FIG. 6 operates at a fixed constant speed. Buffer 106 is longer than buffer 106 in FIG. 1 due to the high collision speed of the buffer. Therefore, the distance PD from the bottom floor 201 to the bottom of the hoistway pit, and the overhead Ο の from the top floor 210 to the machine room floor are much longer than those in Fig. 1. Therefore, the length of the hoistway is longer than in the case of Fig. 1. Therefore, with the configuration of FIG. 1 of the present invention, space can be saved while improving safety. FIG. 7 shows the setting of the first set speed B and the second set speed C different from those shown in FIG. In the case of Fig. 3, the first set speed B and the second set speed C are set higher by a certain fixed speed than the specified speed A, but in Fig. 7, the speed is set higher by a certain ratio. You have set. With this setting, the collision speed α shown in FIG. 5 can be further reduced than in the case of FIG. 3, and the buffer can be reduced accordingly. As a result, the length of the hoistway can be further reduced.

FIG. 8 shows the setting of a first set speed B; a second set speed C different from that shown in FIG. 3 with respect to the specified speed 規定. In the case of Fig. 3, the first set speed B and the second set speed C are set higher than the specified speed A by a certain constant speed.In the case of Fig. 8, the set speed B and the set speed B are set higher. Set speed C is set stepwise. With this setting, the device configuration for judging and executing the emergency braking operation and the governor operation shown in the operation flow of FIG. 4 can be simplified as compared with the case of FIG. The simplest example is a two-stage operation.

FIG. 9 is an operation example showing another embodiment of the present invention. The basic operation is the same as in Fig. 4, except that the car speed is higher than the rated speed. At step 201, it is determined whether the car can operate at a speed higher than the rated speed. If high-speed operation is possible, a first set speed B and a second set speed C are generated in step 2002 when high-speed traveling is possible. Subsequent steps are the same as those after ① in Fig. 4. If high-speed operation is not possible, generate the first and second set speeds at the rated speed as in step 1002 in Fig. 4. After that, it is the same as after.

An example of a determination as to whether or not the speed can be made can be made based on whether or not the capacity of the converter in the drive control device 7 is exceeded when the speed is increased. That is, the conversion of the converter The capacity is maximized when the car is at rated speed, at rated load capacity, and when climbing. When the load capacity is small or when the descent operation is performed, there is room for the conversion capacity. Therefore, under this condition, the speed can be increased according to the margin of the converter. High-speed driving can reduce the time required for the car to arrive at the specified floor, especially when the passengers are not on board and arriving at the destination floor. As a result, the transport efficiency of the car is increased, and the overall transport capacity can be improved. If the speed is simply increased, the terminal voltage of the motor 31 will increase in proportion to the speed, and a value exceeding the maximum output voltage of the converter may be required. In this case, it can be dealt with by performing the field weakening control of the motor.

As described above, according to the present embodiment, the emergency stop is safely stopped. At this time, since the first set speed operates with priority, the possibility that the safety gear operates will be small. For this reason, there is the advantage that the rail is not damaged when the safety device is actuated, and no effort is required to release it. In addition, safety is high because the response to speed abnormalities is dual. As a result, the size of the buffer can be reduced, and the length of the hoistway can be shortened and the transport capacity can be improved.

Claims

The scope of the claims

1. A means for setting a first set speed that is different depending on the position of the car in the hoistway, and a speed higher than the first set speed and different depending on the position of the car in the hoistway Means for setting a second set speed which is a speed, a mechanical brake which is activated when the elevator car speed exceeds the first set speed, and an elevator car. An elevator system including an emergency stop device that is activated when the speed exceeds the second set speed.

2. Means for setting a specified speed for normal operation at the specified acceleration and speed from the lower end floor to the upper end floor or from the upper end floor to the lower end floor, and a speed higher than this specified speed Means for setting a first set speed that is different depending on the position of the car in the hoistway, and a speed higher than the first set speed and depending on the position of the car in the hoistway. Means for setting a second set speed which is different, a mechanical brake which is activated when the elevator car speed exceeds the first set speed, and an elevator car speed which is one time. An elevator system comprising an emergency stop device that operates when the speed exceeds the second set speed.

3. In claim 1,

An elevator having a governor that operates when a car speed of the elevator exceeds the first set speed, wherein the emergency stop device operates in conjunction with the operation of the governor. Yuichi system.

4. In Claim 2,

The elevator system according to claim 1, wherein the first set speed and Z or the second set speed are set to be larger than the specified speed by a fixed speed. .

5. In Claim 2,

The elevator system, wherein the first set speed and / or the second set speed are set to be higher than the specified speed by a fixed rate.

6. In Claim 2,

The elevator system according to claim 1, wherein the first set speed and / or the second set speed are set stepwise higher than the specified speed.

7. In Claim 1,

The mechanical brake is actuated until the car stops when the elevator car speed exceeds the first set speed every night, and the emergency stop device is used to lift an elevator. An elevator system which operates until the car stops when the car speed exceeds the second set speed.

8. A sheave connected to the motor to drive the car, means for setting a first set speed that is different depending on the position of the car in the hoistway, and a speed higher than the first set speed. Means for setting a second set speed that is different depending on the position of the car in the hoistway, and the speed of the elevator car being higher than the first set speed. A mechanical brake that operates so as to stop the rotation of the motor or the sheave when the elevator is mounted, and a speed at which the speed of the elevator of the elevator exceeds the second set speed. Elevator system with a brake that operates when

9. In Claim 8,

The mechanical brake is adapted to control the elevator car speed to the first setting. When the speed exceeds the constant speed, the car operates until the car stops, and the brake provided on the car has a speed at which the car speed of the elevator exceeds the second set speed. An elevator system that operates until the car stops.