CN109484942B - Device and method for detecting breakage of hoisting rope and triggering braking - Google Patents
Device and method for detecting breakage of hoisting rope and triggering braking Download PDFInfo
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- CN109484942B CN109484942B CN201710810265.1A CN201710810265A CN109484942B CN 109484942 B CN109484942 B CN 109484942B CN 201710810265 A CN201710810265 A CN 201710810265A CN 109484942 B CN109484942 B CN 109484942B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
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- Maintenance And Inspection Apparatuses For Elevators (AREA)
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Abstract
A device for detecting breakage of a traction rope and triggering braking comprises a motion sensor, a weighing device, a force sensor, a calculation unit, a control unit, a braking device and a weight balance system, wherein the motion sensor is used for acquiring motion information of a car in real time, and the weighing device is used for acquiring load in the car in real time and outputting the load information to the calculation unit; the device is used for measuring the tension value of a single traction steel wire rope in real time and outputting the tension value to the control unit; the calculation unit comprises a storage part and a calculation part, and the control unit is used for receiving the car speed information, the theoretical tension value and the actual measurement tension value and outputting a signal to the braking device; the braking device enables the braking assembly to brake or reset the car. The invention can trigger the brake device to act when the elevator runs at an overspeed, and can also trigger the brake device to act when the traction steel wire rope is broken, so as to respond the situation that the suspension system is broken in time and improve the safety of the elevator running.
Description
Technical Field
The invention relates to the field of elevators, in particular to a device for detecting breakage of a hoisting rope and triggering braking. The invention also relates to a method for detecting a break in a hoisting rope and triggering a braking device.
Background
When partial traction steel wire ropes of the elevator are broken, the broken ropes are easily wound and knotted with adjacent ropes or other parts in a hoistway, and the operation safety of the elevator is seriously influenced.
Patent CN102923544B monitors the tension of the elevator hoisting rope, and when the measured tension value is reduced by 50% in 1 second, it is determined that the rope is broken, and the elevator opens the door close to the flat floor and stops running. According to the scheme, each steel wire rope needs to be provided with a corresponding force sensor, and the production and maintenance cost is high.
On the other hand, the conventional elevator brake control devices all adopt speed triggering, namely, when the speed of the elevator car is detected to exceed a preset threshold value, the elevator brake device is triggered to act to brake the car. When part of the traction steel wire rope of the elevator is broken, the speed of the elevator car may not exceed a set threshold value, and the brake control device is not triggered. In particular, when the traction wire ropes are all broken, the elevator system is in a dangerous state at the moment, and the brake is required to be immediately braked, but because the traditional elevator brake device can only be triggered by the speed, the speed of the elevator car does not reach the set triggering speed at the moment, the elevator brake device cannot be triggered immediately. The car will fall freely until the triggering speed is reached and the elevator braking device is triggered and brakes the car. This triggering mode has a delayed response in response to a broken suspension system, which is detrimental to passenger and cargo safety.
If the breaking of the traction steel wire rope can be detected in a simpler mode and the breaking signal of the traction steel wire rope is used for triggering the elevator braking device, important guarantee is provided for the safe operation of the elevator.
Disclosure of Invention
The present invention has been made in view of the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an apparatus and method for detecting breakage of a hoisting rope and triggering braking, which can trigger the operation of a braking device when an elevator having the apparatus is operated at an overspeed and also trigger the operation of the braking device when the hoisting rope is broken, thereby promptly responding to the breakage of a suspension system and improving the safety of the operation of the elevator.
To achieve the above object, the present invention provides an apparatus for detecting a breakage of a hoist rope and triggering braking, comprising a motion sensor, a weighing device, a force sensor, a calculation unit, a control unit, a braking device, and a weight balance system, wherein: the motion sensor is used for acquiring car motion information in real time, the car motion information comprises car position, speed or acceleration information, the car speed information is output to the control unit, and the car position and acceleration information is output to the calculation unit; the weighing device is used for acquiring the load in the lift car in real time and outputting load information to the computing unit; the force sensor is arranged on the traction rope and is used for measuring the tension value of a single traction steel wire rope in real time and outputting the tension value to the control unit; the calculating unit comprises a storage part and a calculating part, the storage part is used for storing known parameters in a weight balance system of the elevator, and the calculating part calculates the theoretical tension value of a single traction steel wire rope corresponding to the position of the force sensor according to the known parameters in the weight balance system, the car motion information measured by the motion sensor and the load information in the car measured by the weighing device; the control unit is used for receiving the car speed information output by the motion sensor, the theoretical tension value output by the calculation unit and the actual measurement tension value output by the force sensor and outputting a signal to the braking device; the braking device brakes or resets the car by the braking component through electromagnetic acting force according to the electric signal output by the control unit.
Preferably, the weight balance system comprises a traction rope, a traction machine, a guide wheel, a counterweight, a trailing cable and a compensation chain; the first end part of the hoisting rope is connected with a counterweight by bypassing the traction machine and the guide pulley, the second end part of the hoisting rope is fixedly connected with the car, and the second end part of at least one of the hoisting ropes is connected with the car by a force sensor; the traveling cable comprises a first end part and a second end part, the first end part of the traveling cable is connected with the wall of the well, and the second end part of the traveling cable is fixedly connected with the bottom of the car; and the two ends of the compensation chain are respectively connected with the bottom of the lift car and the bottom of the counterweight.
Preferably, the known parameters are the number and length of hoisting ropes, the empty mass and height of the car, the unit mass and length of the trailing cable, the mounting position of the trailing cable to the shaft connection, the unit mass and length of the compensating chain and the height of the counterweight.
Preferably, when the speed of the car exceeds the preset speed of the elevator, or the measured tension value is greater than the theoretical tension value in a short time, the control unit outputs a control signal to enable the braking device to brake the car.
Preferably, the motion sensor is one, and the motion sensor is used for separately acquiring motion information of one of position, speed and acceleration of the car and obtaining other two motion information through differentiation or integration.
Preferably, the motion sensors are multiple and respectively acquire information of the position, the speed and the acceleration of the car.
Preferably, the weighing device is arranged at the bottom of the car and measures the load in the car after the car is closed.
Preferably, the braking device comprises at least one set of braking components, wherein each set of braking components comprises: a support member for supporting the brake assembly; the brake block comprises a braking surface, a guided surface, an elastic connecting surface and a free motion surface, wherein the braking surface is used for contacting or separating an elevator guide rail to brake or reset the elevator; a guide block including a guide surface in frictional contact with a guided surface of the brake block to thereby contact or separate the guide block with or from the elevator guide rail, and a connection surface fixedly connected to the support member; the elastic energy storage element is fixedly connected with the elastic connecting surface of the brake block, and the pushing force or the traction force generated by the elastic energy storage element on the brake block is used for controlling the position and the movement direction of the brake block; at least one set of brake assemblies includes: and the electromagnetic actuator is used for receiving the electronic signal of the control unit and generating electromagnetic force to control the position and the movement direction of the brake block.
Preferably, the motion sensor includes a code belt disposed along a running path of the car, and a detection part fixedly installed on the car for reading a code on the code belt, thereby obtaining real-time position information of the car.
Preferably, the theoretical tensile value at the force sensor is calculated by the formula:
wherein T represents the theoretical tension value of a single hauling rope, N represents the number of the hauling ropes in the whole system, M0Indicating mass of car when empty, M1Representing the load in the car, m13Denotes the mass per unit length, L, of the trailing cable13Indicates the length of the car-side trailing cable, m14Denotes the mass per unit length of the compensation chain, L14Indicates the length of the car-side compensating chain, gnWhich represents the gravitational acceleration and a represents the acceleration of the car in the direction of ascent and descent.
Preferably, said L13、L14The calculation formula of (2) is as follows:
wherein L represents the total length of the trailing cable, H13Denotes the height of the first end of the trailing cable from the bottom of the shaft, H1Indicating the height of the car bottom from the bottom of the shaft, H14Representing the height of the bottom of the compensating chain from the bottom of the hoistway.
Preferably, the theoretical tensile value at the force sensor is calculated by the formula:
wherein α, β are correction coefficients, and in the initial running process of the elevator, theoretical tension values and actual tension values at different floors are recorded, and α, β are obtained by a least square method.
Preferably, α, β are set as variables when α, β as constants cannot match the theoretical pull value with the measured pull value.
Preferably, the relationship between the measured tension value and the theoretical tension value is as follows:
wherein, T49The measured tension value is represented, T represents the theoretical tension value, N represents the number of the hoisting ropes in the whole system, and N represents the number of the broken hoisting ropes.
The invention also provides a method for detecting the breakage of the traction steel wire rope and triggering the braking, which comprises the following steps: inputting known parameters to the computing unit; when the elevator starts to operate normally, recording measured values and theoretical values of a single traction rope 12 at a plurality of different positions of the elevator operation, and determining a correction coefficient through an algorithm; and detecting the theoretical tension value and the actual tension value of a single traction rope in the running process of the elevator in real time.
Preferably, the method further comprises the steps of: when the measured tension value is greater than the theoretical tension value
When the steel wire rope is broken, the steel wire rope is judged to be brokenA brake device brakes the elevator; wherein N is the number of the hoisting ropes.
Preferably, the method further comprises the steps of: and when the actually measured tension value is reduced by more than 50% within 0.1 second, the steel wire rope is judged to be broken, and the braking device brakes the elevator.
The invention overcomes the defects of the prior art, detects whether the traction steel wire rope is broken or not in a simpler mode, and triggers the elevator braking device by the traction steel wire rope breakage signal, thereby providing important guarantee for the safe operation of the elevator.
Drawings
Fig. 1 is a control schematic diagram of the apparatus for detecting a breakage of a hoist rope and triggering braking of the present invention.
Fig. 2 is a first embodiment of the device for detecting a break in a hoisting rope and triggering braking according to the invention.
Fig. 3 is an embodiment of a braking device in the first embodiment of the device for detecting a breakage of a hoist rope and triggering braking according to the present invention.
Fig. 4 is a weight balance system of a first embodiment of the apparatus for detecting a breakage of a hoist rope and triggering braking of the present invention.
Fig. 5 is a graph showing a change in force applied to a force sensor when a wire rope provided with the force sensor breaks in the first embodiment of the apparatus for detecting a breakage of a hoist rope and triggering braking according to the present invention.
Fig. 6 is a graph showing a change in force applied to a force sensor when a wire rope, to which the force sensor is not provided, breaks in one embodiment of the apparatus for detecting a breakage of a hoist rope and triggering braking according to the present invention.
Fig. 7 is a flow chart of a method for hoist rope break detection and brake triggering according to the present invention.
Description of reference numerals:
1 car 1a Upper guide
1b lower guide 11a traction machine
13 trailing cable 14 compensating chain
15 counterweight 2 guide rail
20 service aisle 3 brake
30 brake assembly 31 brake pad
32 support frame 32a frame upper plate
33 elastic element 35 guide block
36 elastomer 38 electromagnetic actuator
38a electromagnetic actuator movable part 38b electromagnetic actuator fixed part
47 weighing device 48 motion sensor
49 force sensor 5 transmission unit
6 calculating unit 7 control unit
Detailed Description
As shown in fig. 1, the apparatus for detecting a breakage of a hoist rope and triggering braking of the present invention has a braking device 3, a weighing device 47, a motion sensor 48, a force sensor 49, a transmission unit 5, a calculation unit 6, a control unit 7, and the like.
The motion sensor 48 collects information such as position, speed and acceleration of the car in real time, and can be a sensor which only collects one motion information of the position, the speed and the acceleration separately and obtains the other two motion information through differentiation or integration; or a plurality of sensors which respectively collect position, speed and acceleration information. The weighing device 47 measures the load in the car each time the car is closed. The force sensor 49 measures the tension of a single hoisting rope in real time, which can be installed at the top of the car, at the top of the counterweight or at the top of the hoistway rope end beam, respectively, depending on the hoisting ratio of the elevator. For example, in a 1: 1 traction ratio system, the force sensor 49 may be mounted on top of the car or on top of the counterweight; in a 2: 1 traction ratio system, the force sensor 49 may be mounted at the rope end beam at the top of the elevator hoistway. The calculation unit 6 has a storage part for storing known parameters of the elevator and a calculation part for calculating the theoretical tension value of the single hoisting wire rope corresponding to the position of the force sensor 49 based on the known parameters, the car motion information measured by the motion sensor 48 and the load information in the car measured by the weighing device 47. The control unit 7 is responsible for monitoring the car speed output by the motion sensor 48, the theoretical tension value output by the calculation unit 6 and the measured tension value output by the force sensor 49. When the speed of the car exceeds a specified speed range or the difference between the theoretical tension value and the actual tension value is large, the control unit 7 outputs a control signal to trigger the braking device 3 to act to brake the car.
As shown in fig. 2, the apparatus for detecting breakage of a hoist rope and triggering braking of the present invention has a guide rail 2 disposed in a running passage 20, and guide shoes 1a, 1b provided above and below a car 1, respectively; the car 1 moves up and down along the guide rail 2 by engagement of the guide shoe with the guide rail. The bottom of the car 1 is provided with a weighing device 47, so that the load in the car can be obtained in real time. The motion sensor 48 has a code strip 48a and a detection portion 48b, the code strip 48a being arranged along the travel path of the car 1, the detection portion 48b being fixedly mounted on the car 1, the detection portion being able to read the code on the code strip 48a, so as to obtain real-time position information of the car 1. The speed and acceleration information of the car 1 can be obtained by performing first differentiation and second differentiation on the position information. The top of the car 1 is connected with a plurality of traction steel wire ropes 12, and a force sensor 49 is arranged between one of the steel wire ropes and the car 1 and can measure the tension of the corresponding steel wire rope in real time. The calculation unit 6 has a storage part for storing the known parameters of the elevator and a calculation part for calculating the theoretical tension value of the single hoisting wire rope 12 corresponding to the position of the force sensor 49 based on the known parameters of the elevator, the car motion information measured by the motion sensor 48 and the car load information measured by the weighing device 47. The control unit 7 is responsible for monitoring the car speed output by the motion sensor 48, the theoretical tension value output by the calculation unit 6 and the measured tension value output by the force sensor 49. When the speed of the car exceeds a specified speed range or the difference between the theoretical tension value and the actual tension value is large, the control unit 7 outputs a control signal to trigger the braking device 3 to act to brake the car 1.
As shown in fig. 3, in the apparatus for detecting a breakage of a hoist rope and triggering braking according to the present invention, a braking apparatus 3 is provided, the braking apparatus 3 includes a braking unit 30, and the braking unit 30 is composed of: the braking surface of the brake block 31 is parallel to the side surface of the guide rail 2, and an included angle is formed between the guide surface of the brake block and the side surface of the guide rail 2; the guide block 35 is fixedly connected with the support frame 32 through an elastic body 36; the support frame 32 is fixedly connected with the car 1; the brake shoe 31 is connected to the support frame 32 by means of an elastic element 33, the elastic element 33 generating a pushing or pulling force on the brake shoe 31 for controlling the position and the movement direction of said brake shoe 31; the actuator 38 is used for maintaining the position of the brake block 31 and limiting the movement direction thereof; the elastic body 36 can cause the brake shoe 31 to generate a pressing force against the rail 2.
The electromagnetic actuator 38 is composed of a movable portion 38a and a fixed portion 38b, 38a being fixedly attached to the guide surface of the brake pad 31 (i.e., the back surface away from the guide rail 2), and 38b being fixedly attached to the side surface of the guide block 35 close to the brake pad 31. The contact surface of the guide block 35 with the actuator fixing portion 38b is a slope whose inclination angle is matched with the guide surface of the brake pad 31 to ensure that the braking surface of the brake pad 31 is parallel to the side surface of the guide rail 2. The brake assemblies 30 can be respectively arranged on two sides of the guide rail 2, namely, each side surface of the guide rail 2 is correspondingly provided with a brake block 31; it is also possible to provide the brake assembly 30 on only one side of the rail 2, i.e. to provide one of the sides of the rail 2 with a brake shoe 31.
The elevator braking apparatus 3 brakes the car 1 by the braking unit 30 using electromagnetic power based on an electric signal output from the control unit 7.
Fig. 4 shows a weight balance system according to embodiment 1 of the present invention. As shown in the drawing, a hoisting rope 12 above the car 1 is passed around a hoisting machine 11a and a guide sheave 11b, and is connected to a counterweight 15. Only one of the steel wire ropes 12 is connected to the car 1 via the force sensor 49, and the remaining steel wire ropes 12 are directly connected to the car 1. One end of the traveling cable 13 is connected with the bottom of the car 1, and the other end is connected with the wellThe road walls are connected. The two ends of the compensation chain 14 are respectively connected with the bottom of the car 1 and the bottom of the counterweight 15. As shown, L13Is the length of the car side trailing cable, L14The length of the car-side compensation chain is calculated from the known parameters and the car 1 position. The theoretical tensile value at the force sensor 49 can be calculated as follows.
In the formula, T represents the theoretical tension value of a single traction wire rope 12, N represents the number of traction wire ropes 12 in the whole system, and M0Represents the mass of the car 1 when it is empty (excluding the mass of the trailing cable 13 and the compensating chain 14 mounted on the car 1), M1Representing the load in the car 1, m13Denotes a mass per unit length, L, of the trailing cable 1313Indicates the length of the car-side trailing cable, m14Denotes the mass per unit length, L, of the compensating chain 1414Indicates the length of the car-side compensating chain, gnRepresents the acceleration of gravity, and a represents the acceleration of the car 1 in the ascending and descending direction; n, M0、m13、m14、gnIs a constant number, M1、L13、L14And a is a variable. M1A can be measured directly by the corresponding sensor, L13、L14One calculation method of (2) is as follows.
Wherein L represents the total length of the trailing cable 13, and H13Represents the height H from the junction of one end of the traveling cable 13 and the wall of the well to the bottom of the well1Indicating the height of the bottom of the car 1 from the bottom of the shaft, H14Indicating the height of the bottom of the compensating chain 14 from the bottom of the hoistway. Obviously, L, H13Is a constant number, H1Are variables. Since the traction ratio of embodiment 1 is 1: 1, the height at which the car 1 is raised/lowered during the operation of the elevator is the same as the height at which the counterweight 15 is lowered/raised, so H14Is also constant.The methods for obtaining or calculating all the variables in formula (1) have been described so far.
Equation (1) is modified in consideration that the tension of the traction wire rope 12 may be affected by various factors in the actual operation of the elevator.
In the formula, α, β are correction factors, in the initial running process of the elevator, theoretical tension values and measured tension values at different floors are recorded, α, β are obtained by using a least square method, so that the theoretical tension values and the measured tension values are consistent, T can be closer to the actual situation, furthermore, when α, β which are constants cannot make the theoretical tension values and the measured tension values consistent, α, β can be set as variables, for example, with respect to the height H of the car1Function α of car acceleration a (H)1，a)、β(H1，a)。
Fig. 5 is a graph showing a change in the force applied to the force sensor when the wire rope on which the force sensor is disposed breaks according to embodiment 1 of the present invention. When the wire rope 12 equipped with the force sensor 49 is broken, the tension value measured by the force sensor 49 is greatly reduced or even zeroed in a very short time.
Fig. 6 is a graph showing changes in the force applied to the force sensor when a certain wire rope is broken in embodiment 1 of the present invention in which the force sensor is not disposed. When the wire rope 12 not provided with the force sensor 49 is broken, the tensile force value measured by the force sensor 49 is significantly larger than the theoretical value in a very short time, and the relationship between the measured value and the theoretical value is as follows.
In the formula, T49Indicating the measured value output by the force sensor 49, T the theoretical value output by the calculation unit 6, N the number of hoisting ropes 12 in the whole system and N the number of broken hoisting ropes 12.
Fig. 7 is a flowchart showing the operation of embodiment 1 of the present invention. After the elevator is installed (step S1), the elevator is started to the calculation sheetThe unit 6 inputs a series of parameters of the elevator (step S2) including, but not limited to, the number and length of the hoisting ropes 12, the empty mass and height of the car 1, the unit mass and length of the trailing cable 13, the installation location of the trailing cable 13 to the hoistway connection, the unit mass and length of the compensating chain 14, the height of the counterweight 15, etc. When the elevator starts to operate normally, the measured values and the theoretical values of the single traction steel wire rope 12 are recorded at a plurality of different positions of the elevator operation, and the correction coefficient is determined through an algorithm (step S3). Then, the theoretical value and the measured value of the single hoisting wire rope 12 during the operation of the elevator are detected in real time (step S4). When the measured value exceeds the theoretical value
(N is the number of hoisting ropes 12) (step S5), it is determined that the rope is broken and the brake 3 is actuated (step S8). When the actual measurement value rapidly and largely drops, for example, by 50% or more within 0.1 second (step S6), it is determined that the wire rope is broken and the brake 3 is actuated (step S8). If the above-described cases of steps S5 and S6 do not occur, it is determined that the wire rope is not broken (step S7), and monitoring of the theoretical value and the actual measurement value is continued (step S4).
Claims (17)
1. Device for detection of a rope break and triggering of braking, characterized by comprising a motion sensor, a weighing device, a force sensor, a calculation unit, a control unit, a braking device and a weight-balancing system, wherein:
the motion sensor is used for acquiring car motion information in real time, the car motion information comprises car position, speed or acceleration information, the car speed information is output to the control unit, and the car position and acceleration information is output to the calculation unit;
the weighing device is used for acquiring the load in the lift car in real time and outputting load information to the computing unit;
the force sensor is arranged on the traction rope and is used for measuring the tension value of a single traction steel wire rope in real time and outputting the tension value to the control unit;
the calculating unit comprises a storage part and a calculating part, the storage part is used for storing known parameters in a weight balance system of the elevator, and the calculating part calculates the theoretical tension value of a single traction steel wire rope corresponding to the position of the force sensor according to the known parameters in the weight balance system, the car motion information measured by the motion sensor and the load information in the car measured by the weighing device;
the control unit is used for receiving the car speed information output by the motion sensor, the theoretical tension value output by the calculation unit and the actual measurement tension value output by the force sensor and outputting a signal to the braking device;
the braking device brakes or resets the car by the braking component through electromagnetic acting force according to the electric signal output by the control unit.
2. The apparatus for hoist rope breakage detection and braking triggering of claim 1, wherein the weight balancing system includes a hoist rope, a traction machine, a guide sheave, a counterweight, a trailing cable, a compensating chain;
the first end part of the hoisting rope is connected with a counterweight by bypassing the traction machine and the guide pulley, the second end part of the hoisting rope is fixedly connected with the car, and the second end part of at least one of the hoisting ropes is connected with the car by a force sensor;
the traveling cable comprises a first end part and a second end part, the first end part of the traveling cable is connected with the wall of the well, and the second end part of the traveling cable is fixedly connected with the bottom of the car;
and the two ends of the compensation chain are respectively connected with the bottom of the lift car and the bottom of the counterweight.
3. The apparatus for hoist rope breakage detection and triggering braking according to claim 2, wherein the known parameters are the number and length of the hoist ropes, the empty load mass and height of the car, the unit mass and length of the trailing cable, the installation position of the trailing cable to the hoistway connection portion, the unit mass and length of the compensating chain, and the height of the counterweight.
4. The apparatus for detecting breakage of a traction rope and triggering braking as claimed in claim 3, wherein the control unit outputs a control signal to cause the braking means to brake the car when the car speed exceeds a preset speed of the elevator or the measured tension value is greater than a theoretical tension value for a short time.
5. The apparatus for detecting breakage of a traction rope and triggering braking as claimed in claim 4, wherein the motion sensor is one which separately acquires one of the position, speed and acceleration of the car and obtains the other two kinds of motion information by differentiation or integration.
6. The apparatus for detecting a breakage of a hoist rope and triggering braking according to claim 4, wherein the plurality of motion sensors respectively collect information on a position, a speed, and an acceleration of the car.
7. The apparatus for detecting breakage of a hoist rope and triggering braking as claimed in claim 4, wherein the weighing device is provided at a bottom of the car and measures a load in the car after the door of the car is closed.
8. The device for hoisting rope break detection and triggered braking of claim 4, wherein the braking device comprises at least one set of brake assemblies, wherein,
each set of brake assemblies includes:
a support member for supporting the brake assembly;
the brake block comprises a braking surface, a guided surface, an elastic connecting surface and a free motion surface, wherein the braking surface is used for contacting or separating an elevator guide rail to brake or reset the elevator;
a guide block including a guide surface in frictional contact with a guided surface of the brake block to thereby contact or separate the guide block with or from the elevator guide rail, and a connection surface fixedly connected to the support member;
the elastic energy storage element is fixedly connected with the elastic connecting surface of the brake block, and the pushing force or the traction force generated by the elastic energy storage element on the brake block is used for controlling the position and the movement direction of the brake block;
at least one set of brake assemblies includes:
and the electromagnetic actuator is used for receiving the electronic signal of the control unit and generating electromagnetic force to control the position and the movement direction of the brake block.
9. The apparatus for detecting breakage of a hoist rope and triggering braking according to claim 6, wherein the movement sensor includes a code strip disposed along a traveling path of the car and a detecting portion fixedly installed on the car for reading a code on the code strip, thereby obtaining real-time position information of the car.
10. The apparatus for hoist rope breakage detection and brake triggering of claim 8, wherein the theoretical tension value at the force sensor is calculated by the formula:
wherein T represents the theoretical tension value of a single hauling rope, N represents the number of the hauling ropes in the whole system, M0Indicating mass of car when empty, M1Representing the load in the car, m13Denotes the mass per unit length, L, of the trailing cable13Indicates the length of the car-side trailing cable, m14Denotes the mass per unit length of the compensation chain, L14Indicates the length of the car-side compensating chain, gnWhich represents the gravitational acceleration and a represents the acceleration of the car in the direction of ascent and descent.
11. The apparatus for hoist rope break detection and brake triggering of claim 10, wherein L is13、L14The calculation formula of (2) is as follows:
wherein L represents the total length of the trailing cable, H13Denotes the height of the first end of the trailing cable from the bottom of the shaft, H1Indicating the height of the car bottom from the bottom of the shaft, H14Representing the height of the bottom of the compensating chain from the bottom of the hoistway.
12. The apparatus for hoist rope breakage detection and brake triggering of claim 8, wherein the theoretical tension value at the force sensor is calculated by the formula:
wherein α, β are correction coefficients, and in the initial running process of the elevator, theoretical tension values and actual tension values at different floors are recorded, and α, β are obtained by a least square method.
13. The apparatus for hoist rope breakage detection and brake triggering of claim 12, wherein α, β are set as variables when α, β as constants do not match the theoretical tension value with the measured tension value.
14. Device for detecting a break in the hoisting rope and triggering braking according to any one of claims 1-13, in which the measured tension value is related to the theoretical tension value by:
wherein, T49The measured tension value is represented, T represents the theoretical tension value, N represents the number of the hoisting ropes in the whole system, and N represents the number of the broken hoisting ropes.
15. A method of detecting a hoisting rope break and triggering a brake, characterized in that it uses the apparatus for detecting a hoisting rope break and triggering a brake according to claim 14, which method comprises the steps of:
inputting known parameters to the computing unit;
when the elevator starts to operate normally, recording measured values and theoretical values of a single traction rope at a plurality of different positions of the operation of the elevator, and determining a correction coefficient through an algorithm;
and detecting the theoretical tension value and the actual tension value of a single traction rope in the running process of the elevator in real time.
16. The method of claim 15, further comprising the step of:
when the measured tension value is greater than the theoretical tension value
When the elevator is broken, the brake device brakes the elevator; wherein N is the number of the hoisting ropes.
17. The method of claim 15, further comprising the step of: and when the actually measured tension value is reduced by more than 50% within 0.1 second, the steel wire rope is judged to be broken, and the braking device brakes the elevator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710810265.1A CN109484942B (en) | 2017-09-11 | 2017-09-11 | Device and method for detecting breakage of hoisting rope and triggering braking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN110054046B (en) * | 2019-05-17 | 2021-10-19 | 日立楼宇技术（广州）有限公司 | Method, device, system and elevator equipment for car position determination based on compensation chain |
| CN114323946B (en) * | 2021-12-29 | 2024-12-13 | 深圳中宝集团有限公司 | Method, device and computer equipment for automatic testing of bonding wire tension |
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| JPH05105349A (en) * | 1991-10-14 | 1993-04-27 | Hitachi Building Syst Eng & Service Co Ltd | Elevator rope tension measuring device |
| JP3188833B2 (en) * | 1995-11-17 | 2001-07-16 | 三菱電機株式会社 | Elevator rope tension measuring device |
| JP4340357B2 (en) * | 1999-07-30 | 2009-10-07 | 三菱電機株式会社 | Elevator rope maintenance equipment |
| BRPI0417000B1 (en) * | 2004-04-28 | 2017-03-21 | Mitsubishi Electric Corp | elevator appliance |
| CN102101618B (en) * | 2009-12-22 | 2015-05-13 | 中国建筑科学研究院建筑机械化研究分院 | Method and system for detecting wire ropes of elevator |
| CN103626005A (en) * | 2012-08-24 | 2014-03-12 | 原志坤 | Rope creep protection device of single-rope-winding type hoist |
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