Elevator car counterweight safety monitoring system

Abstract

The application discloses an elevator car counterweight safety monitoring system, comprising: counterweight protection switches, which are provided with a plurality of, are connected in series in the safety circuit of the elevator, and are used for disconnecting the safety circuit when the counterweight of the car occurs abnormity; a first detection circuit and a second detection circuit, the first detection circuit is connected with the upstream end of the counterweight protection switch, and the second detection circuit is connected with the downstream end of the counterweight protection switch; a control unit, the control unit is connected with the first detection circuit and the second detection circuit, and the control unit is configured to: in the case of disconnecting the safety circuit, the state of detecting that the first detection circuit has voltage and the second detection circuit has no voltage is used to judge that the fault is the counterweight abnormality of the car. The application introduces the counterweight protection switch, the double detection circuit and the intelligent control unit, realizes the accurate and rapid diagnosis of the counterweight abnormality of the car, and significantly improves the safety, reliability and maintenance efficiency of the elevator operation.

Description

Technical Field

[0001] This invention relates to the field of elevator safety monitoring technology, specifically to an elevator car anti-rope sheave safety monitoring system. Background Technology

[0002] In traction elevators with a non-1:1 traction ratio, the car is typically equipped with a deflector pulley, and the car is suspended by steel wire ropes that pass around the deflector pulley. This design effectively supports the car's weight and ensures smooth operation during normal use. However, in actual use, the deflector pulley may shift laterally or become misaligned. Once the deflector pulley shifts or becomes misaligned, it will cause abnormal stress on the steel wire rope, leading to wear, detachment, and even serious malfunctions such as pulley axle breakage. These malfunctions not only affect the normal operation of the elevator but may also cause major safety accidents, such as the car falling into the pit, posing a serious threat to the lives of passengers. Currently, there have been several accidents in the industry where car falls have occurred due to misaligned or detached deflector pulleys, highlighting the inadequacies of existing elevator safety protection mechanisms.

[0003] Existing elevator safety protection systems suffer from two major deficiencies in handling such faults. First, they lack fault differentiation. When various safety devices such as the car's anti-cord sheave safety switch, speed governor, buffer, and door locks activate, the elevator control system typically only disconnects the safety circuit uniformly and reports a general "safety circuit fault" to maintenance personnel. This vague fault report makes it difficult for maintenance personnel to quickly locate the specific fault point, requiring them to spend a significant amount of time troubleshooting the entire safety circuit segment by segment, severely impacting troubleshooting efficiency and elevator recovery time. Second, they lack tiered voltage detection logic. Existing systems cannot distinguish whether the safety circuit disconnection is caused by an external safety switch trigger or by the activation of the car's anti-cord sheave dedicated protection switch. This means that even if the anti-cord sheave malfunctions, the system cannot identify and report this specific fault separately, instead classifying it as a general safety circuit fault. This lack of refined diagnostic capabilities prevents timely and targeted maintenance and repair of car anti-cord sheave anomalies, increasing potential risks to elevator operation and reducing overall maintenance efficiency. Therefore, existing technologies urgently need improvement to address these issues. Summary of the Invention

[0004] This invention discloses an elevator car anti-cord sheave safety monitoring system, which aims to solve the problems of poor fault differentiation and lack of graded voltage detection logic in existing elevator safety protection systems when dealing with abnormalities in the car anti-cord sheave, which makes it difficult for maintenance personnel to quickly locate the fault point, affecting the efficiency of fault troubleshooting and the time for elevator to resume operation.

[0005] The technical solution of the present invention is as follows: A safety monitoring system for an elevator car anti-cord sheave includes: Several anti-cord sheave protection switches are provided, each connected in series in the elevator's safety circuit, and are used to disconnect the safety circuit when an abnormality occurs in the car's anti-cord sheave. A first detection line and a second detection line, wherein the first detection line is connected to the upstream end of the anti-rope wheel protection switch, and the second detection line is connected to the downstream end of the anti-rope wheel protection switch; A control unit, connected to the first detection line and the second detection line, is configured to determine that the fault is an abnormality of the car anti-rope sheave by detecting that the first detection line has voltage and the second detection line has no voltage when the safety circuit is disconnected.

[0006] Furthermore, it also includes: A first device plate and a second device plate are disposed between a car anti-rope sheave and a car mounting beam; The plurality of anti-rope wheel protection switches are evenly arranged on the periphery of the first device plate; The first device plate is fixedly connected to the car mounting beam; The second device plate is flexibly connected to the first device plate.

[0007] Furthermore, there are two anti-cord pulley protection switches, which are respectively installed on the left and right sides of an anti-cord pulley in the car, and the two anti-cord pulley protection switches are connected in series in the safety circuit.

[0008] Furthermore, the control unit is also configured to: in the event that the safety circuit is disconnected, determine that the fault is an abnormality in the safety circuit upstream of the anti-rope wheel protection switch by detecting that both the first detection line and the second detection line have no voltage.

[0009] Furthermore, the control unit is also configured to: in the event that the safety circuit is disconnected, determine that the fault is an abnormality in the safety circuit downstream of the anti-rope wheel protection switch by detecting that both the first detection line and the second detection line have voltage.

[0010] Furthermore, the first device plate has a through hole in the middle for a wheel axle to pass through, and the car anti-rope pulley is installed through the wheel axle.

[0011] Furthermore, the second device plate is connected to the first device plate by a rubber component or a spring.

[0012] Furthermore, the anti-rope pulley protection switch is a normally closed switch.

[0013] Furthermore, the control unit is an elevator control motherboard; the first detection line is connected to terminal X26 of the elevator control motherboard, and the second detection line is connected to terminal X27 of the elevator control motherboard.

[0014] Furthermore, the control unit includes: A voltage acquisition module, used to acquire voltage signals from the first detection line and the second detection line; and A fault logic discrimination module is used to determine the fault type based on the voltage signal.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention connects a deflector protection switch in series in the elevator safety circuit, and sets a first detection line and a second detection line at the upstream and downstream ends of the switch, respectively, and connects them to the control unit. When the safety circuit is disconnected, the control unit can accurately determine that the fault is an abnormality of the car's deflector by detecting the presence of voltage in the first detection line and the absence of voltage in the second detection line. This technical solution significantly improves fault differentiation and solves the defect of "poor fault differentiation" in existing systems. In the prior art, when the deflector malfunctions, the system can only report general safety circuit faults, requiring maintenance personnel to spend a lot of time checking the entire safety circuit segment by segment. This invention, however, can directly identify the specific fault of the deflector malfunction, greatly shortening the fault location time, improving maintenance efficiency, and reducing the elevator's recovery time.

[0016] Furthermore, this invention achieves "graded voltage detection logic" for anti-cord sheave anomalies by performing graded detection and logical discrimination on the voltage states of the first and second detection circuits. This solves the problem that existing systems cannot distinguish whether the safety circuit is broken due to an external safety switch trigger or the operation of the anti-cord sheave's dedicated protection switch. By accurately identifying anti-cord sheave anomalies, the system can provide maintenance personnel with more targeted fault information, enabling timely and purposeful maintenance and repair work, thereby effectively reducing potential risks to elevator operation and improving overall maintenance efficiency.

[0017] In summary, the elevator car anti-cord sheave safety monitoring system of the present invention, by introducing an anti-cord sheave protection switch, dual detection circuits and intelligent control unit, achieves accurate and rapid diagnosis of abnormalities in the car anti-cord sheave, effectively solving the pain points of poor fault differentiation and lack of graded voltage detection logic in the prior art, and significantly improving the safety, reliability and maintenance efficiency of elevator operation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structural design of an elevator car anti-rope pulley safety monitoring system provided by the present invention; Figure 2 This is a schematic diagram of the structure of the first device plate of the present invention; Figure 3 A circuit diagram of an elevator car anti-rope wheel safety monitoring system provided by the present invention; Figure 4 The present invention provides a control logic diagram for an elevator car anti-rope pulley safety monitoring system. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] To illustrate the technical solution described in this invention, specific embodiments are described below.

[0022] Example Combination Figures 1-4 As shown, this embodiment provides an elevator car anti-reverse sheave safety monitoring system, which includes an anti-reverse sheave protection switch 1, a first detection line, a second detection line, and a control unit. Several anti-reverse sheave protection switches 1 are provided and connected in series in the elevator's safety circuit, used to disconnect the safety circuit when an abnormality occurs in the car anti-reverse sheave 2. The first detection line is connected to the upstream end of the anti-reverse sheave protection switch 1, and the second detection line is connected to the downstream end of the anti-reverse sheave protection switch 1. The control unit is connected to the first and second detection lines and is configured to: when the safety circuit is disconnected, determine that the fault is an abnormality in the car anti-reverse sheave 2 by detecting that there is voltage in the first detection line and no voltage in the second detection line.

[0023] This system, by introducing a deflector protection switch 1, a first detection circuit, a second detection circuit, and a control unit, achieves accurate diagnosis of abnormalities in the car's deflector. When an abnormality occurs in the car's deflector 2, the deflector protection switch 1 activates and disconnects the safety circuit. Simultaneously, the control unit accurately determines that the fault originates from the abnormality in the car's deflector 2 by detecting the presence of voltage in the first detection circuit and the absence of voltage in the second detection circuit, thus significantly improving the efficiency and accuracy of fault diagnosis.

[0024] Specifically, the anti-cord sheave protection switch 1 is a normally closed switch, which is in a closed state under normal circumstances. When the car anti-cord sheave 2 malfunctions (such as displacement or tilting), the switch will be triggered and open, thereby cutting off the elevator's safety circuit and stopping the elevator. The safety circuit is a critical circuit in the elevator used to ensure operational safety; any activation of a safety device will cause the safety circuit to disconnect, thus forcing the elevator to stop. The first and second detection lines are circuits used to detect the voltage state at both ends of the anti-cord sheave protection switch 1, and they are connected to the upstream and downstream ends of the anti-cord sheave protection switch 1, respectively. The control unit is the core of the system, responsible for receiving and processing the voltage signals from the detection lines and determining the fault type according to preset logic. It specifically includes a voltage acquisition module and a fault logic discrimination module. The voltage acquisition module is used to acquire the voltage signals from the first and second detection lines; the fault logic discrimination module is used to determine the fault type based on the voltage signals.

[0025] In this embodiment, the control unit is an elevator control mainboard. A first detection line is connected to terminal X26 of the elevator control mainboard, and a second detection line is connected to terminal X27 of the elevator control mainboard. It collects voltage signals through the first detection line connected to the first terminal X26 and the second detection line connected to the second terminal X27. When the elevator control mainboard detects voltage at both X26 and X27, but the entire safety circuit is disconnected, it can be determined that the safety circuit downstream of the anti-cord sheave protection switch is abnormal.

[0026] The system operates as follows: Under normal operating conditions, the anti-reverse sheave protection switch 1 is closed, the safety circuit is active, and both the first and second detection lines have voltage. When the car anti-reverse sheave 2 malfunctions, for example, if it shifts during operation and presses against the anti-reverse sheave protection switch 1, the switch will activate and disconnect. At this point, the elevator's safety circuit is cut off, and the elevator will immediately stop. Simultaneously, the control unit monitors the voltage status across the anti-reverse sheave protection switch in real time via the first and second detection lines. Due to the disconnection of the anti-reverse sheave protection switch 1, its upstream end (connected to the first detection line) retains voltage, while its downstream end (connected to the second detection line) loses voltage. Once the control unit detects this specific voltage state of "voltage on the first detection line and no voltage on the second detection line," it can accurately determine that the current fault is caused by an abnormality in the car anti-reverse sheave 2.

[0027] Furthermore, the system also includes a first device plate 3 and a second device plate 4, which are positioned between a car deflector sheave 2 and a car mounting beam 5. A plurality of deflector sheave protection switches 1 are evenly distributed around the periphery of the first device plate 3. The first device plate 3 is fixedly connected to the car mounting beam 5, and the second device plate 4 is flexibly connected to the first device plate 3. The first device plate 3 and the second device plate 4 are structural components used to install and support the deflector sheave protection switches 1. The first device plate 3 is designed to be fixedly connected to the car mounting beam 5, thus providing a stable base for the entire monitoring system. The second device plate 4 is flexibly connected to the first device plate 3, which can be achieved, for example, through rubber components, springs, or other elastic elements, to allow the second device plate 4 to displace or deform relative to the first device plate within a certain range. A plurality of deflector sheave protection switches 1 are evenly distributed on the first device plate 3, and their positions are precisely designed so that they can be effectively triggered when an abnormality occurs in the car deflector sheave 2.

[0028] Furthermore, the first device plate 3 has a through hole in the middle for a wheel axle 6 to pass through, and the car anti-rope wheel 2 is installed through the wheel axle 6.

[0029] Furthermore, in the event of a safety circuit disconnection, the control unit is also configured to determine that the fault is an abnormality in the safety circuit upstream of the anti-reverse sheave protection switch by detecting a lack of voltage in both the first and second detection lines. This configuration allows for the identification of not only car anti-reverse sheave abnormalities but also abnormalities in the safety circuit upstream of the anti-reverse sheave protection switch when the safety circuit is disconnected. Specifically, when the safety circuit is disconnected, the control unit detects the voltage status of the first and second detection lines. If both the first and second detection lines are without voltage, it indicates that the fault is located in the safety circuit upstream of the anti-reverse sheave protection switch, such as a broken power line or an unclosed upstream safety contact. This detection mechanism allows the control unit to more comprehensively analyze the fault conditions of the safety circuit, thereby providing more accurate fault diagnosis.

[0030] Furthermore, in the event of a safety circuit disconnection, the control unit is also configured to determine that the fault is an anomaly in the safety circuit downstream of the anti-reverse sheave protection switch by detecting the presence of voltage in both the first and second detection lines. This configuration allows the system to identify not only car anti-reverse sheave anomalies but also anomalies in the safety circuit downstream of the anti-reverse sheave protection switch when the safety circuit is disconnected. Specifically, when the safety circuit is disconnected, the control unit continuously monitors the voltage status of the first and second detection lines. If voltage is detected in both the first and second detection lines, it indicates that current has passed through the anti-reverse sheave protection switch but has failed to flow through the downstream safety circuit, thus accurately locating the fault as an anomaly in the safety circuit downstream of the anti-reverse sheave protection switch. This detailed fault classification helps maintenance personnel quickly locate the fault point and improves maintenance efficiency.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A safety monitoring system for an elevator car anti-cord pulley, characterized in that, include: Several anti-cord sheave protection switches are provided, each connected in series in the elevator's safety circuit, and are used to disconnect the safety circuit when an abnormality occurs in the car's anti-cord sheave. A first detection line and a second detection line, wherein the first detection line is connected to the upstream end of the anti-rope wheel protection switch, and the second detection line is connected to the downstream end of the anti-rope wheel protection switch; A control unit, connected to the first detection line and the second detection line, is configured to determine that the fault is an abnormality of the car anti-rope sheave by detecting that the first detection line has voltage and the second detection line has no voltage when the safety circuit is disconnected.

2. The elevator car anti-cord pulley safety monitoring system according to claim 1, characterized in that, Also includes: A first device plate and a second device plate are disposed between a car anti-rope sheave and a car mounting beam; The plurality of anti-rope wheel protection switches are evenly arranged on the periphery of the first device plate; The first device plate is fixedly connected to the car mounting beam; The second device plate is flexibly connected to the first device plate.

3. The elevator car anti-cord pulley safety monitoring system according to claim 1, characterized in that, The control unit is also configured to: in the event that the safety circuit is disconnected, determine that the fault is an abnormality in the safety circuit upstream of the anti-rope wheel protection switch by detecting that both the first detection line and the second detection line have no voltage.

4. The elevator car anti-cord pulley safety monitoring system according to claim 1, characterized in that, The control unit is also configured to: in the event that the safety circuit is disconnected, determine that the fault is an abnormality in the safety circuit downstream of the anti-rope wheel protection switch by detecting that both the first detection line and the second detection line have voltage.

5. The elevator car anti-cord pulley safety monitoring system according to claim 2, characterized in that, The first device plate has a through hole in the middle for a wheel axle to pass through, and the car anti-rope wheel is installed through the wheel axle.

6. The elevator car anti-cord sheave safety monitoring system according to claim 2, characterized in that, The second device plate is connected to the first device plate by a rubber component or a spring.

7. The elevator car anti-cord pulley safety monitoring system according to claim 1, characterized in that, The anti-reverse rope pulley protection switch is a normally closed switch.

8. The elevator car anti-cord pulley safety monitoring system according to claim 1, characterized in that, The control unit is an elevator control mainboard; the first detection line is connected to terminal X26 of the elevator control mainboard, and the second detection line is connected to terminal X27 of the elevator control mainboard.

9. The elevator car anti-cord sheave safety monitoring system according to claim 1, characterized in that, The control unit includes: A voltage acquisition module, used to acquire voltage signals from the first detection line and the second detection line; and A fault logic discrimination module is used to determine the fault type based on the voltage signal.

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