Determination method of steel belt wire breakage position

Abstract

The invention provides a method for determining the position of a broken wire of a steel belt. The method aims at solving the problem that CN114104925B does not give the specific position of a broken wire point. The method is characterized in that a traction system with a broken wire detection device and an alarm circuit and a broken wire positioning device of the traction system are used, the broken wire positioning device comprises an MCU, a position sensor and the alarm circuit, and the alarm circuit is a photoelectric isolator; when the broken wire passes through the wheels, the time for the broken wire to pass through the wheels is different, and the corresponding alarm duration and mode are different, so that whether the broken wire passes through the traction wheel, the counterweight guide wheel or the lift car guide wheel can be determined, and then the broken wire alarm signal is generated according to the product of the lifting speed V of the lift car and the occurrence time T1 of the broken wire alarm signal. And the distance of the broken wire at the initial position of the traction wheel, the counterweight guide wheel or the lift car guide wheel can be judged.

Description

Technical Field

[0001] This invention relates to the breaking of a traction steel belt (hereinafter referred to as steel belt) in an elevator, specifically a method for determining the location of the broken traction steel belt. Background Technology

[0002] CN114104925B discloses a traction system with a broken wire detection device (see paragraphs 4, 5, and 11 of the specification). It includes a traction sheave, a steel belt, and a detection device. The detection device 5 includes a normally open relay 52 and a power supply 51. The two ends of the normally open relay coil are connected to the positive terminal of the power supply and the rope end, respectively. The negative terminal of the power supply is grounded. The normally open contact of the normally open relay acts as a switch for an alarm circuit. In other words, the traction system with the broken wire detection device includes an alarm circuit. The opening and closing of the alarm circuit is controlled by the normally open contact of the normally open relay (hereinafter, the traction system with the broken wire detection device and its alarm circuit will be referred to as the alarm circuit). Under normal conditions (when there are no broken wires in the steel belt), the steel belt is covered by an insulating layer. When the steel belt passes the traction sheave, the two are insulated, which is equivalent to the switch of the detection circuit being open, not forming a circuit. The normally open relay is not energized and does not operate. When a broken wire appears in the steel belt, the broken wire will break through the insulating layer of the steel belt and move with the running steel belt. When the broken wire passes the traction sheave, the two come into contact, and the broken wire and its steel strip are grounded. The broken wire detection device forms a circuit, the normally open relay coil is energized, its normally open contact closes, and the alarm circuit is activated, sending an alarm signal. That is, the function of the alarm circuit is to send a broken wire alarm signal. It can be seen that CN114104925B can detect broken steel strip wires, but its shortcoming is that it does not give the specific location of the broken wire point. Summary of the Invention

[0003] The purpose of this invention is to provide a method for determining the location of a broken wire in an elevator steel belt.

[0004] An elevator system (hereinafter referred to as an elevator) includes an elevator frame, steel belt, traction sheave, counterweight guide sheave, car, and left and right car guide sheaves located on the top of the car. They have the following characteristics: (1) The car lifting speed V is determined by the elevator nameplate.

[0005] (2) The wrap angle between the traction sheave and the steel belt is 180 degrees, and the relative linear velocity between the steel belt and the traction sheave is twice the car lifting speed V.

[0006] (3) The wrap angle between the counterweight guide wheel and the steel belt is 180 degrees, and the relative linear velocity between the steel belt and the counterweight guide wheel is equal to the car lifting speed V.

[0007] (4) The distance between the two left and right car guide wheels is the car width W, the wrap angle between the steel belt and the car guide wheel is 90 degrees, and the relative linear velocity between the steel belt and the car guide wheel is equal to the elevator lifting speed V.

[0008] (5) All three types of wheels are in a continuous conductor with the elevator support. When the elevator support is grounded, all three types of wheels are grounded at the same time.

[0009] The objective of this invention is achieved as follows: it sequentially uses a traction system with a broken wire detection device and its alarm circuit, and a broken wire positioning device. The broken wire positioning device includes an MCU component (hereinafter referred to as MCU), a position sensor, and an alarm circuit. The alarm circuit refers to an opto-isolator. The two input terminals of the MCU are respectively connected to the position sensor and the opto-isolator, so that the opto-isolator, which serves as the alarm circuit, transmits the broken wire alarm signal to the MCU. The negative terminal of the opto-isolator is grounded. The position sensor is installed on the shaft wall at the bottom of the elevator shaft. When the car reaches the bottom (and can no longer go down), the position sensor corresponds to the car, so that the position sensor can sense the upward signal of the car.

[0010] The elevator car starts from the bottom floor. The position sensor sends the detected start signal to the MCU, and the MCU starts timing. When a steel belt breaks during elevator operation, the normally open contact of the normally open relay of the traction system with the broken wire detection device closes, activating the alarm circuit, i.e., the opto-isolator. The opto-isolator, as the alarm circuit, sends a broken wire alarm signal to the MCU. The MCU records the occurrence time T1 of the broken wire alarm signal (from the start of timing) and the duration T2 of the alarm signal.

[0011] Given the known lifting speeds V and T1 of the car, the distance from the bottom car to the steel belt breakage alarm point is S = V * T1.

[0012] The duration of the broken wire passing through each round is: 3.14*(wrapping angle / 360)*(wheel diameter / wheel linear velocity) (1) According to formula (1), The duration of the broken wire passing through the traction sheave is T21 = 3.14 * (traction sheave wrap angle / 360) * (traction sheave diameter / traction sheave linear velocity).

[0013] The duration of the broken wire passing through the counterweight guide wheel is T22 = 3.14 * (counterweight guide wheel wrap angle / 360) * (counterweight guide wheel diameter / counterweight guide wheel linear velocity).

[0014] The duration T23 of the broken wire passing through the car guide wheel is calculated as T23 = 3.14 * (car guide wheel wrap angle / 360) * (car guide wheel diameter / car guide wheel linear velocity). The duration T24 of the broken wire passing between the two car guide wheels is calculated as T24 = W / V. When the broken wire passes through the left and right car guide wheels, it will emit two alarm signals with a time interval of T23 seconds.

[0015] As can be seen from the above, the time it takes for the broken wire to pass through each wheel is different, and the corresponding alarm duration and mode will also be different. If the duration of the broken wire alarm signal is T21 seconds, it can be determined that the wheel through which the broken wire passed is the traction wheel, and therefore the location of the broken wire should be S=V*T1 from the starting position of the traction wheel; if the duration of the broken wire alarm signal is T22 seconds, it can be determined that the wheel through which the broken wire passed is the counterweight guide wheel, and the location of the broken wire should be S=V*T1 from the starting position of the counterweight guide wheel; if the broken wire alarm signal appears twice with an interval of T24 seconds, it can be determined that the wheels through which the broken wire passed are the two car guide wheels, and the location of the broken wire should be S=V*T1 from the starting position of the car guide wheels.

[0016] Compared with CN114104925B, the positive effect of this invention is that it further indicates the location of the broken wire in the steel strip, which greatly facilitates the subsequent repair work of the steel strip. Attached Figure Description

[0017] The invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is the electrical schematic diagram of the present invention. Detailed Implementation

[0019] See Figure 1 This invention requires the sequential use of a traction system with a broken wire detection device and its alarm circuit, and a broken wire positioning device. The broken wire positioning device includes an MCU, a position sensor, an alarm circuit, and a display. The display is used to show various parameters involved in this invention, such as the occurrence time of the broken wire alarm signal and the duration of the alarm signal. The alarm circuit refers to an opto-isolator. The two input terminals of the MCU are connected to the position sensor and the opto-isolator, respectively. The negative terminal of the opto-isolator is grounded by connecting it to the elevator frame. The position sensor is installed on the shaft wall at the bottom of the elevator shaft. When the car reaches the bottom, the position sensor corresponds to the car, enabling the position sensor to sense the upward signal of the car.

[0020] The elevator car starts from the bottom floor. The position sensor sends the detected start signal to the MCU, and the MCU starts timing. When a steel belt breaks during elevator operation, the normally open contact K of the normally open relay of the traction system with the broken wire detection device closes, activating the alarm circuit, i.e., the opto-isolator. The opto-isolator, as the alarm circuit, sends a broken wire alarm signal to the MCU. The MCU records the time of occurrence of the broken wire alarm signal, such as the 10th second from the start of timing, i.e., T1=10 seconds, and the duration of the alarm signal, T2.

[0021] Given: the lifting speed of the car is V = 0.5 m / s, T1 = 10 seconds, then the distance from the bottom car to the steel belt breakage alarm point is S = V * T1 = 0.5 × 10 = 5 meters. The diameter of the traction sheave, counterweight guide sheave, and car guide sheave is 0.1 meters, and the car width is W = 1.5 meters, according to formula (1). The duration of the broken wire passing through the traction sheave is T21 = 3.14 × (180 / 360) × 0.1 / (0.5 × 2) = 0.157 seconds.

[0022] The time it takes for the broken wire to pass through the counterweight guide wheel is T22 = 3.14 * (180 / 360) * 0.1 / (0.5 × 1) = 0.314 seconds.

[0023] The time it takes for the broken wire to pass the car guide wheel is T23 = 3.14 * (90 / 360) * (0.1 / 0.5) = 0.157 seconds. The time it takes for the broken wire to pass between the two car guide wheels is T24 = 1.5 / 0.5 = 3 seconds. When the broken wire passes the left and right car guide wheels, it will emit two alarm signals of 0.157 seconds each, with an interval of 3 seconds between the two alarm signals.

[0024] As can be seen from the above, the time it takes for the broken wire to pass through each wheel is different, and the corresponding alarm duration and method will also be different.

[0025] If the duration of the wire breakage alarm signal is 0.157 seconds, it can be determined that the wheel through which the wire broke is the traction wheel, and the location of the wire breakage should be S=V*T1=5 meters away from the starting position of the traction wheel. If the duration of the wire breakage alarm signal is 0.314 seconds, it is determined that the wheel through which the wire broke is the counterweight guide wheel, and the location of the wire breakage should be 5 meters away from the starting position of the counterweight guide wheel.

[0026] If the wire breakage alarm signal appears twice with a 3-second interval and each signal lasts for 0.157 seconds, it is determined that the broken wire passed through the two car guide wheels, and the location of the broken wire should be 5 meters away from the starting position of the car guide wheels.

Claims

1. A method for determining the location of a broken steel strip wire, comprising sequentially using a traction system with a broken wire detection device and its alarm circuit, and a broken wire positioning device, wherein the broken wire positioning device includes an MCU, a position sensor, and an alarm circuit; the alarm circuit refers to an opto-isolator, wherein the two input terminals of the MCU are respectively connected to the position sensor and the opto-isolator, so that the opto-isolator, as the alarm circuit, transmits the broken wire alarm signal to the MCU, and the negative terminal of the opto-isolator is grounded; the position sensor is installed on the shaft wall at the bottom of the elevator shaft, and when the car moves to the bottom, the position sensor corresponds to the car, so that the position sensor can sense the upward signal of the car; The elevator car starts from the bottom floor. The position sensor sends the detected start signal to the MCU, and the MCU starts timing. If a steel belt breaks during elevator operation, the MCU records the time T1 when the breakage alarm signal occurs and the duration T2 of the alarm signal. Given the lifting speed V of the car, the distance from the bottom car to the steel belt breakage alarm point is S=V*T1; The duration of the broken wire passing through each wheel of the elevator is: 3.14*(wrapping angle / 360)*(wheel diameter / wheel linear velocity) (1) According to formula (1), The duration of the broken wire passing through the traction sheave is T21 = 3.14 * (traction sheave wrap angle / 360) * (traction sheave diameter / traction sheave linear velocity). The duration of the broken wire passing through the counterweight guide wheel is T22 = 3.14 * (counterweight guide wheel wrap angle / 360) * (counterweight guide wheel diameter / counterweight guide wheel linear velocity). The duration of the broken wire passing through the car guide wheel is T23 = 3.14 * (car guide wheel wrap angle / 360) * (car guide wheel diameter / car guide wheel linear velocity); the duration of the broken wire passing between the two car guide wheels is T24 = W / V. When the broken wire passes through the left and right car guide wheels, it will emit two alarm signals with a time interval of T23 seconds. The time interval between the two alarm signals is T24 seconds. If the duration of the wire breakage alarm signal is T21 seconds, the wheel through which the wire broke is determined to be the traction sheave, and the location of the wire breakage should be S=V*T1 from the starting position of the traction sheave; if the duration of the wire breakage alarm signal is T22 seconds, the wheel through which the wire broke is determined to be the counterweight guide wheel, and the location of the wire breakage should be S=V*T1 from the starting position of the counterweight guide wheel; if the wire breakage alarm signal is repeated at intervals of T24 seconds, with each alarm lasting for T23 seconds, the wheels through which the wire broke are determined to be the two car guide wheels, and the location of the wire breakage should be S=V*T1 from the starting position of the car guide wheels.

Images