JPH0725553A - Elevator control system - Google Patents

Abstract

PURPOSE:To eliminate any relative positional deviation between handing ropes on respective winding machine sides and a balance weight in an elevator system for driving a car by means of two hoisting machines. CONSTITUTION:The rotational speed of an adjusting block (running block) 10 provided above a cage is detected by a speed sensor 113, or the relative positional deviation amount between hanging ropes 5a, 5b on the side of respective hoisting machines, hung on the adjusting block 10 or the rotational angle of the adjusting block 10 is electrically detected, so as to be subjected to feedback to the speed command input side (B block) of at least one of hoisting machines, thereby the speeds of hoisting machines are so controlled that the relative positional deviation may become zero.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control system for driving a car by two hoisting machines.

[0002]

2. Description of the Related Art FIG.
A basket with two hoisting machines proposed in No. 697
Fig. 2 shows an example of the configuration of an elevator system that drives a basket up and down. In the figure, 1a, 1b are motors, 2a,
2b is a brake, 3a and 3b are sheaves, and "motor 1
a, a brake 2a, a sheave 3a "and a" motor 1b, a brake 2b, a sheave 3b "are integrally assembled as one hoisting machine. 4a and 4b are baffle wheels and 5 (5
a, 5b) is a single hanging rope, which is hung on a movable pulley 10 installed on the upper part of the car 6, and the rope 5a side is connected to the upper part of the counterweight 7a via the sheave 3a and the deflector 4a. The rope 5b side is connected to the upper part of the counterweight 7b via the sheave 3b and the deflector 4b. 8 is a compensating rope, which is a moving pulley 1 installed at the bottom of the car.
It is hung on the rope 1 and is connected to the lower portions of the counterweights 7a and 7b via fixed pulleys 9a and 9b.

Next, the operation of the elevator will be described. In the configuration of FIG. 11, the motor 1 of the two hoisting machines
Basically, a and 1b are controlled at uniform speed, and when hoisting, the sheaves 3a and 3b rotate at the same speed in the directions of the solid arrows (A, B) shown in the figure. Performs lifting motion without rotating. Here, when a speed difference occurs between the two hoisting machines, for example, when the speed of the sheave 3a becomes higher than the speed of the sheave 3b during hoisting, this corresponds to the speed difference between the sheaves 3a and 3b. Depending on the speed, the movable pulleys 10 and 11 move up and down while rotating in the direction of the dotted arrow (C) shown. The suspension rope 5 and the compensation rope 8 are counterweights 7a and 7
a loop is formed via b and the moving pulleys 10, 1
Since 1 is configured to rotate according to the speed difference, the load of the hanging rope 5 is the same on the 5a side and the 5b side. Therefore, the loads applied to the sheaves 3a and 3b of both hoisting machines are also the same, and the load imbalance of both hoisting machines can be eliminated.

[0004]

As described above, according to the elevator system proposed above, it is possible to balance the loads on both hoisting machines, but the speed difference between the sheaves 3a and 3b is accumulated. As a result, the relative positions of the counterweights 7a and 7b connected to both ends of the suspension rope 5 will gradually increase. And, in that limit, regardless of the position of the car 6, one counterweight 7a (7b) reaches the upper limit position of the lift and the other counterweight 7b (7a) reaches the lower limit position of the lift, and further winding is performed. Alternatively, there may be a case in which the unwinding is impossible. Even when the rotating speeds of both hoisting machines are exactly the same, the diameter of the sheave changes due to the difference in wear between the sheaves 3a and 3b, which causes a difference in the hoisting speed of the ropes 5a and 5b, resulting in the position of the counterweights 7a and 7b. Studs can occur. Therefore, it is necessary to control the hoisting speed of the hoisting rope 5 on the hoisting machine side (5a, 5b) to be always equalized.

The present invention has been made in order to solve the above problems, and always equalizes the hoisting speeds of the hoisting machines of the hoisting ropes, and the difference in hoisting speeds of the ropes of the hoisting machines. The purpose of the present invention is to provide a control method for making the integrated value zero, and to eliminate the relative misalignment of both counterweights.

[0006]

SUMMARY OF THE INVENTION An elevator control system according to the present invention is one in which a car portion is driven by a suspension rope suspended from two hoisting machines via an adjusting pulley; in a 1: 1 roping system. Is equipped with means for detecting the rotational speed of the adjustment sheave (moving sheave) on the upper part of the car or the adjustment sheave (moving sheave) on the counterweight, and in the 2: 1 roping system, the building or fishing The hoisting speed difference on each hoisting machine side of the hoisting rope is calculated by providing a means for detecting the rotation speed of the adjusting sheave (fixed sheave) fixedly installed on the building above the weight, and at least one hoisting machine Feedback is provided to the machine drive control unit. In addition, electric position detection means relatively installed on the hoisting ropes of both hoisting machines (for example, a contactor fixed to one hoisting rope and a sliding resistor fixed to another hoisting rope).
Thus, the relative positional deviation amount of the suspension rope is directly detected as an electric signal, and this signal is fed back to at least one hoisting machine drive control section. Further, a position detecting means for electrically detecting the rotation angle of the adjusting pulley (for example, a contactor fixed to the car and a sliding resistor attached to the moving pulley) is provided, and the detected rotation angle is at least one winding. Feedback is provided to the upper machine drive control section.

[0007]

The elevator control system according to the present invention detects the rotational speed of the adjusting pulley, the hoisting speed difference between the hoisting machines on the hoisting rope side, the relative positional deviation of the hoisting rope, or the rotation angle of the adjusting sheave. By feeding back these detected values to at least one of the hoisting machine drive control units, the hoisting speed is controlled so as to eliminate the relative positional deviation of the hoisting ropes on both hoisting machine sides.

[0008]

【Example】

Example 1. 1 is a configuration diagram showing an elevator system according to Embodiment 1 of the present invention. In the figure, the motor 1
a and 1b are configured to rotate the sheaves 3a and 3b, respectively, and the brakes 2a and 2b are configured to apply braking to the rotational drive. Further, 5 is a suspension rope hanging on an adjusting pulley (moving pulley) 10 installed on the upper portion of the car 6, and one side 5a of the rope is an upper portion of the counterweight 7a via the sheave 3a and the deflector 4a. And the other side 5b of the rope is connected to the balance weight 7b via the sheave 3b and the deflector 4b.
Attached to the top of. Reference numeral 8 denotes a compensating rope, which is hung on an adjusting sheave (moving sheave) 11 installed at the bottom of the car 6, and is provided with a counterweight 7a, through a fixed sheave 9a, 9b.
It is connected to the bottom of 7b. Further, in this embodiment, speed sensors 112a and 112b are attached to the two hoisting machines (1a to 3a and 1b to 3b), respectively, to detect the rotational speed of each hoisting machine. Further, a speed sensor 113 is installed on an adjusting pulley (moving pulley) 10 above the car 6,
The rotation speed of the adjusting pulley (moving pulley) 10 is detected. Although not shown, the speed sensor 113 is connected via a speed increaser as needed.

FIG. 2 is a block diagram showing a configuration example of the drive control circuit in the first embodiment. In the figure, 112
a and b are speed sensors installed in the motors 1a and b of the respective hoisting machines, 10 is an adjusting pulley (moving pulley) provided on the top of the car 6, 113 is a speed sensor of the adjusting pulley (moving pulley) 10,
Reference numeral 5 denotes a suspension rope, and 5a and 5b respectively indicate rope portions on the hoisting machine side. The above-mentioned components correspond to those having the same reference numerals as in FIG. 114a and b are each motor 1
Variable frequency / variable voltage (VVVF) inverter devices serving as a and b power supplies, and 15a and 15b are the inverter devices 114 described above.
Signal generators for frequency command (f ^* ), voltage command (V ^* ), etc. given to a and b, 16a, b and 18 are proportional-integral circuit parts (PI
17a, 17b, 17b1 are signal addition units. Blocks A and B shown in FIG. 2 are independent control circuits that control and drive the motors 1a and 1b of each hoist, and basically operate by inputting a common speed command (N ^* ). However, in one B block, the proportional / integral circuit section (PI control section) 18 is connected from the speed sensor 113 to the B block.
Through the adjustment pulley (moving pulley) 10 rotation speed proportional amount (K
₄ ω) and the cumulative rotation angle proportional amount (K ₃ ∫ωdt) are fed back.

Next, the operation of the first embodiment will be described. The A and B control blocks in FIG. 2 are feedback type speed control circuits that are generally widely used. Basically, both blocks receive a common speed command (N ^* ) to drive the motors 1a and 1b at the same speed. It is a drive circuit that tries to rotate. Here, for some reason, both motors 1a, 1b
There is a speed difference between the suspension ropes 5a and 5b on each hoisting machine side.
If there is a difference in the hoisting speed, the adjustment pulley (moving pulley) 10
Rotates at a rotation speed proportional to the hoisting speed difference between the hanging ropes 5a and 5b. Rotation speed ω of this adjusting pulley (moving pulley) 10
Is detected by the speed sensor 113, and the proportional-plus-integral circuit section 18
After that, the rotation speed proportional amount (K ₄ ω) and the cumulative rotation angle proportional amount (K ₃ ∫ωdt) are fed back to the adder 17b1 on the speed command input side of the block B. In this system, the output code of the proportional-plus-integral circuit section 18 is the motor 1b.
When the hoisting speed of the hanging rope 5b on the side is higher than that on the side of 5a, it is set to be negative, and when it is lower, it is set to be positive. As described above, the hanging ropes 5a, 5b
The hoisting speed difference can be detected as the rotation speed ω of the adjusting pulley (moving pulley) 10, and the relative point (Pa) between the certain point (Pa) on the rope 5a side and the certain point (Pb) on the rope 5b side can be detected. The positional deviation is the cumulative rotation angle (∫ω) of the adjusting pulley (moving pulley) 10.
dt), the speed signal ω of the adjusting pulley (moving pulley) 10
Is fed back through the proportional-integral circuit section 18, it becomes possible to control the motor in the direction in which both the speed difference between the suspension ropes 5a and 5b and the relative positional deviation amount are made zero, and the balance weights 7a and 7b are controlled. It is possible to eliminate the relative positional deviation of.

Embodiment 2. 3 and 4 are a configuration diagram and a control system diagram of an elevator according to a second embodiment of the present invention, in which the same reference numerals as those in FIGS. 1 and 2 denote the same components. In this method, the suspension rope 5 is provided with an electric position detecting means.
Install a contact type or non-contact type, rope 5a
The amount of relative positional deviation between the winding portion and the portion 5b is detected, and this amount of deviation is fed back to the speed command input side of at least one hoisting machine control portion. Various means can be considered as means for electrically detecting the positional deviation, but here, a Wheatstone bridge (hereinafter simply referred to as bridge) type detection method using a contact type variable resistor will be described as an example. In FIG. 3, 20 is a contactor fixed to the rope 5a side, 21 is a variable resistor fixed to the rope 5b side together with its underframe, and one end of the contactor 20 is electrically connected to one end of the variable resistor 21. It is connected to the. Reference numeral 22 denotes a bridge circuit device installed on the upper portion of the car 6, and the connection lines extending from both ends of the variable resistor 21 are drawn into the bridge circuit device 22. Reference numeral 23 is a guide pipe for stably supporting the underframe of the variable resistor 21. When a relative displacement occurs between the ropes 5a and 5b, the contact 20 slides on the contact surface of the resistor 21 and the resistance value of the resistor 21 changes. A bridge circuit shown in FIG. 5 is incorporated in the bridge circuit device 22. In FIG. 5, reference numeral 30 denotes a constant power supply voltage device, a bridge circuit is formed by the resistors R ₁ , R ₂ , R ₃ and R ₄ , and the variable resistor R ₄ corresponds to the resistor 21 of FIG. The current flowing through the resistor R ₅ changes depending on the value of the variable resistor R ₄ , and becomes zero when the relation of R ₁ · R ₂ = R ₃ · R ₄ is satisfied. When the variable resistance R ₄ changes with the resistance value of R ₄ as a boundary, the current flowing through the resistance R ₅ changes in the plus direction or the minus direction with its absolute amount, so that the ropes 5a, 5
The relative displacement amount of b, including its sign, can be detected as the terminal voltage of the resistor R ₅ . FIG. 4 shows an example of the configuration of an elevator control circuit based on the above-mentioned electrical position detection method. The output voltage of the resistor R ₅ in the bridge circuit device 22 is set to the hoisting machine control section (in FIG. 4, hoisting machine). By feeding back to the adder 17b1 on the speed command input side of the machine 1b side), the ropes 5a side and 5b side can be obtained in the same manner as in the first embodiment.
It is possible to control the hoisting machine motor so that the relative positional deviation amount on the side becomes zero.

Embodiment 3. 6 and 7 show a device for detecting the rotation angle of the adjusting pulley (moving pulley) 10 which is an adjusting pulley (moving pulley).
The example attached to the part is shown. The relative position detecting method is the second embodiment.
Similar to the above, either the contact type or the non-contact type may be used, but here, an example of the Wheatstone bridge type is shown. In FIG. 6, 20 is a contact, 21 is a resistor, and 22 is a bridge device, which are the same as those in the second embodiment. Further, the same reference numerals of the other constituent parts and the constituent parts of FIG. 7 indicate the same parts as those of FIGS. 3, 4 and 5. In the figure, contact 20
Is fixed to the shaft support of the adjusting pulley (moving pulley) 10, and one end thereof is electrically connected to one end of a resistor 21 attached to the end surface of the adjusting pulley (moving pulley) 10. Since the resistor 21 rotates together with the adjusting pulley (moving pulley) 10, the contact 20
Due to the variable contact with the variable pulley, its resistance value changes in proportion to the rotation angle of the adjusting pulley (moving pulley) 10. This resistance change is taken out as an output voltage of the bridge device 22 and fed back to 17b1 on the speed command input side shown in the elevator control circuit of FIG. 7, whereby the rotation angle of the adjusting pulley (moving pulley) 10, that is, the ropes 5a and 5b. It is possible to control the relative displacement amount to zero.

Embodiment 4. FIG. 8 shows a 1: 1 roping elevator system in which two hoisting machines are used to drive a car and a counterweight via a loop-shaped suspension rope, and an embodiment in which the present invention is applied to this system. Will be described. A typical elevator arrangement is configured such that a counterweight moves up and down the back side of the car (opposite the car entrance) so that multiple elevators can be placed side by side. FIG. 8 shows a system that enables such an arrangement. In the figure, the same numbers and the same subscripts indicate the same parts as in FIG. The elevator drive circuit is similar to that shown in FIG. Compared to the system in Fig. 1, this method installs two hoisting machines on two floors, one on top and the other on the bottom, and also uses a counterweight 7, an adjusting pulley (moving pulley) 12 above it, and a compensating rope. The pulleys 9 are grouped into one piece.
The suspension rope 5 has its both ends connected so as to form a loop by itself, and is configured to suspend the car 6 and the counterweight 7 via adjustment sheaves (moving sheaves) 10 and 12. In the fourth embodiment, by installing the speed sensor 113 on the adjusting pulley 10 above the car 6, each hoist 3a,
When a difference occurs in the hoisting speed of b, the speed sensor 113 detects the rotational speed ω of the adjusting pulley 10 and calculates the cumulative rotational angle (∫ωdt) by the same operation as that in the first embodiment. Feedback to the motor drive circuit of the upper machine,
The suspension ropes 5a and 5b are controlled so that both the speed difference and the relative positional deviation amount are equalized to zero. The speed sensor 113 may be installed on the adjusting pulley 12 above the counterweight 7 to detect the rotation speed. Further, as shown in the second embodiment, the relative position deviation amount of the suspension ropes 5a and 5b may be detected by the electric position detecting means provided in the adjusting pulley and may be fed back to the hoisting machine control section. As shown in the third embodiment, a method of detecting and feeding back the rotation angle of the adjusting pulley may be adopted.

Example 5. FIG. 9 shows an example in which the present invention is applied to a 2: 1 roping elevator system that raises and lowers a car by two hoisting machines. This system shows a configuration in which two hoisting machines 3a and 3b are installed on the same floor, and counterweights 7a and 7b are separately arranged on both sides of the car 6, and 13 and 14a and 14b are of the building. The adjustment pulley (fixed pulley) fixed to a beam is shown. The movable pulleys installed on the upper portion of the car 6 are divided into two, that is, 10a and 10b, and the movable pulleys 12a and 12b are attached to the counterweights 7a and 7b. The suspension rope 5 has its both ends connected so as to form a loop, and the movable pulleys 10a, 10b, 1
The car 6 and the counterweights 7a and 7b are suspended via the 2a and 12b. In the fifth embodiment, the adjusting pulley (constant pulley) 1
3, the speed sensor 113 is installed in each of the hoisting machines 3a and 3b.
If there is a difference in the hoisting speed, the speed sensor 113 detects the rotation speed ω of the adjusting pulley 13 and calculates the cumulative rotation angle (∫ωdt) by the same operation as in the first embodiment, It is fed back to the machine drive circuit and controlled so that both the speed difference and the relative positional deviation amount of the suspension ropes 5a and 5b are equalized to zero. The speed sensor 11
3 is an adjusting pulley (constant pulley) 14a, b, an adjusting pulley (moving pulley)
11 may be installed to detect the speed difference and the relative positional deviation amount. Further, as shown in the second embodiment, the relative position deviation amount of the suspension ropes 5a and 5b may be detected by the electric position detecting means provided in the adjusting pulley and may be fed back to the hoisting machine control section. As shown in the third embodiment, a method of detecting and feeding back the rotation angle of the adjusting pulley may be adopted.

Embodiment 6. FIG. 10 is an application example of a 2: 1 roping elevator system for raising and lowering a car by two hoisting machines as in the case of the ninth embodiment. Two hoisting machines are installed separately on two floors, a counterweight 7 This is a method that combines the two. In order to avoid interference of ropes, three moving pulleys 10a, 10a,
10b, 10c and 12a, 12b, 12c are installed. The suspension rope 5 has its both ends connected so as to form a loop, and the movable pulleys 10a, 10b,
10c and 12a, 12b, 12c above the counterweight 7
The car 6 and the counterweight 7 are suspended via the. In the sixth embodiment, the speed sensor 113 is installed on the adjusting pulley (constant pulley) 14a, and when a difference occurs in the hoisting speeds of the hoisting machines 3a and 3b, the same speed as that of the first embodiment is used to perform The sensor 113 detects the rotation speed ω of the adjusting pulley 14a, calculates the cumulative rotation angle (∫ωdt), and feeds it back to the hoisting machine drive circuit to detect the speed difference and relative position of the suspension ropes 5a and 5b. Control so that both of the amounts are zero. In addition, the speed sensor 113 is used as an adjusting pulley.
The fixed pulley 14b may be installed to detect the speed difference and the relative positional deviation amount. Further, as shown in the second embodiment, the relative position deviation amount of the suspension ropes 5a and 5b may be detected by the electric position detecting means provided in the adjusting pulley and may be fed back to the hoisting machine control section. As shown in the third embodiment, a method of detecting and feeding back the rotation angle of the adjusting pulley may be adopted.

As shown in Examples 4, 5 and 6, 1
In an elevator system in which a car and a counterweight are driven by a looped suspension rope of, it is necessary to arrange so that the joints of the ropes do not pass through any sheaves, and in an elevator system with two counterweights. Care must be taken not to change the relative position of the two counterweights.

[0017]

As described above, according to the present invention, the hoisting speed difference and relative positional deviation amount of the hoisting ropes on each hoisting machine side are detected and fed back to the control circuit of at least one hoisting machine. The motor rotation speed is controlled so that the amount of deviation is zero, so the hoisting speed of each hoisting machine is always equalized, there is no case where hoisting is impossible, and the relative position deviation of the counterweight Therefore, there is an effect that an elevator system with stable operation can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an elevator system according to a first embodiment of the present invention.

FIG. 2 is a configuration example of the elevator control circuit according to the first embodiment.

FIG. 3 is a configuration diagram showing an elevator system according to a second embodiment of the present invention.

FIG. 4 is a configuration example of an elevator control circuit according to the second embodiment.

FIG. 5 is a Wheatstone bridge circuit used in the second embodiment.

FIG. 6 is a configuration diagram showing an elevator system according to Embodiment 3 of the present invention.

FIG. 7 is a configuration example of an elevator control circuit according to the third embodiment.

FIG. 8 is a configuration diagram showing an elevator system according to Embodiment 4 of the present invention.

FIG. 9 is a configuration diagram showing an elevator system according to Embodiment 5 of the present invention.

FIG. 10 is a configuration diagram showing an elevator system according to Embodiment 6 of the present invention.

FIG. 11 is a configuration diagram showing a conventional elevator system.

[Explanation of symbols]

 1a, b motor 2a, b brake 3a, b sheave 5,5a, b suspension rope 6 car 7a, b counterweight 8 compensating rope 10 adjusting pulley (moving pulley) 11 adjusting pulley (moving pulley) 12 adjusting pulley (moving pulley) ) 112a, b Motor speed sensor 113 Adjustment pulley speed sensor 114a, b Inverter device 15a, b Signal generator 16a, b, 18 Proportional integrator circuit 17a, b, b1 Signal adder 20 Contact 21 Variable resistor 22 Bridge Circuit device 23 Guide pipe 30 Constant voltage power supply device

Claims (4)

[Claims] 1. A control system for an elevator that drives one car part and one or more counterweights via an adjusting pulley by a suspension rope suspended from two hoisting machines,
An elevator control system configured to control a speed of a hoisting machine by detecting a relative positional displacement between a suspension rope and an adjusting sheave mounting portion and feeding back the relative positional displacement to a drive control section of at least one hoisting machine. 2. The elevator control system according to claim 1, wherein the relative positional displacement between the suspension rope and the adjustment pulley attachment portion is determined by detecting the rotation speed of the adjustment pulley. 3. The elevator control system according to claim 1, wherein the relative positional displacement between the suspension rope and the adjustment pulley attachment portion is detected by an electrical position detection means installed on the suspension rope on both hoisting machine sides. 4. The elevator control system according to claim 1, wherein the relative positional displacement between the suspension rope and the adjusting pulley mounting portion is obtained by an electric rotation detecting means for detecting a rotation angle of the adjusting pulley.