Steel wire rope head detection device and elevator control method

Abstract

The invention discloses a steel wire rope head detection device, which comprises a switch beating plate, a first type of mounting seat, a second type of mounting seat, a switch assembly, a spring, a limiting seat and a rotary hinge, the first-class mounting seat is fixedly mounted on the upper part of a rope head beam for fixing the rope head of the steel wire rope and close to the rope head of the steel wire rope; the second mounting seat is provided with a first mounting surface and a second mounting surface, the second mounting seat is fixedly mounted on the first mounting seat through the first mounting surface, and the switch assembly is mounted on the second mounting surface; the first mounting surface is perpendicular to the second mounting surface; the switch striking plate comprises a rope head contact part, a connecting part and a switch triggering part; the connecting part is fixed at the top of the first mounting surface of the second mounting seat through a rotary hinge, so that the switch striking plate can rotate around the top of the first mounting surface; the limiting seat is fixed to the side, close to the rope head contact part, of the connecting part, one end of the spring is connected with the limiting seat, and the other end is connected with the first-class mounting seat; the spring applies pulling force to the switch beating plate, so that the rope head contact part is always in contact with the rope head; when the rope heads are in a normal state and an elevator is static, a preset distance exists between the switch triggering part and the switch assembly, the contacts of the switch assembly are connected, and the rope head contact part makes contact with all the rope heads; when the rope head is in an abnormal state, at least one rope head jacks up the rope head contact part, so that the development trigger part triggers the switch assembly, and the contact of the switch assembly is disconnected. The device has the functions of steel wire rope state detection and retention condition detection.

Description

Technical Field

[0001] The invention relates to the technical field of elevators, and in particular to a wire rope end detection device and an elevator control method. Background Art

[0002] There are two main demands for wire rope detection in the current market. One is to detect the state of the wire rope and determine whether the wire or strand of the wire rope is broken, which can be determined by detecting the rise of the wire rope head. The other is to detect the detention condition of the car or counterweight. Under the detention condition, the load on the wire rope will be reduced as a whole, and then the rope head will rise as a whole, which can be determined by detecting the rise of the wire rope head.

[0003] In the reconstruction scenario of old elevators, the wear of wire ropes increases, making it more likely to break wires and strands. The wear of traction sheaves increases, making it more likely to get stuck. Therefore, it is very meaningful to provide a technical solution that can detect both wire rope status and stuck conditions for elevator safety, and the combination of the two can further reduce costs.

[0004] The above two application scenarios have different rising amounts of the wire rope ends, so currently they are detected by two devices respectively, and most of the two devices cannot be installed at the same time. When adding this device to an old elevator, the original rope end assembly must be disassembled or even replaced. This process not only affects the tension level of the wire rope that has been adjusted, but also increases unnecessary labor costs.

[0005] For example, Chinese patent document CN113401775A uses a photoelectric switch to detect whether the rope head is displaced to determine the stranded condition. However, the photoelectric switch cannot accurately detect a single wire rope, and can only determine whether the overall displacement has reached the required amount by installing a light-shielding plate at a fixed position. At the same time, this technical solution requires multiple relays to achieve detection, and the hardware detection logic is complex and the cost is high.

[0006] For example, Chinese patent document CN213387322U determines whether the wire rope is broken by pulling the swing switch after the wire rope head rises. The swing switch cannot determine when the wire rope head rises as a whole, but can only determine the working condition of a single wire rope head rising.

[0007] For example, in Chinese patent documents CN215402441U and CN102874668A, a detection switch is independently set for each rope end, and the rope ends need to be loosened before installation, which results in high equipment and installation costs.

[0008] For example, Chinese patent document CN103738809A detects the retention condition by adding a retention buffer device, and CN116081422 detects the retention displacement detection device by adding a retention displacement detection device, but the cost is also relatively high. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides a wire rope end detection device, comprising a switch plate, a first type of mounting seat, a second type of mounting seat, a switch assembly, a spring, a limit seat and a rotary hinge;

[0010] The first type of mounting seat is fixedly mounted on the upper part of the rope head beam for fixing the rope head of the steel wire rope, close to the rope head of the steel wire rope;

[0011] The second type of mounting seat has a first mounting surface and a second mounting surface, the second type of mounting seat is fixedly mounted on the first type of mounting seat via the first mounting surface, and the switch assembly is mounted on the second mounting surface; the first mounting surface is perpendicular to the second mounting surface;

[0012] The switch plate comprises a rope end contact portion, a connecting portion and a switch trigger portion; the connecting portion is fixed to the top of the first mounting surface of the second type mounting seat by a rotating hinge, so that the switch plate can rotate around the top of the first mounting surface;

[0013] The limit seat is fixed on one side of the connection part close to the rope head contact part, one end of the spring is connected to the limit seat, and the other end is connected to the first type of mounting seat; the tension applied by the spring to the switch plate makes the rope head contact part always contact with the rope head;

[0014] When the rope ends are in a normal state and the elevator is stationary, the switch trigger part is at a preset distance from the switch assembly, the contacts of the switch assembly are connected, and the rope end contact part contacts all rope ends; when the rope ends are in an abnormal state, at least one rope head lifts the rope end contact part, so that the development trigger part triggers the switch assembly, and the contacts of the switch assembly are disconnected.

[0015] Preferably, the wire rope end detection device also includes a pressure block and a first type of bolt assembly; the first type of mounting seat is fixed on the rope end beam by the pressure block and the first type of bolt assembly.

[0016] Preferably, the cross-section of the first type of mounting seat is an L-shaped structure, with a waist-shaped hole at the fixing position with the rope head beam, and a waist-shaped hole at the fixing position with the second type of mounting seat.

[0017] Preferably, the preset distance is calculated based on the minimum value of the corresponding rise amount of a single rope head under an abnormal state.

[0018] Preferably, the abnormal state of the rope end refers to the position state of the corresponding rope end when a single steel wire rope is broken, a car or a counterweight is stranded, or a single steel wire rope is broken.

[0019] Preferably, the shape of the rope end contact portion is adapted to the arrangement of the rope ends.

[0020] Preferably, the switch assembly includes a rocker limit switch or a contact limit switch.

[0021] Preferably, the switch assembly has a first contact and a second contact, the first contact is connected to the safety circuit, and the second contact is connected to the control circuit.

[0022] The present invention also provides an elevator control method, wherein the elevator control system controls the elevator according to the action and reset time of the second contact of the wire rope end detection device, wherein the wire rope end detection device is the wire rope end detection device according to claim 8;

[0023] When the elevator is in normal operation, when it is detected that the second contact is disconnected, the elevator is controlled to stop running; when it is detected that the second contact is connected, it is judged whether the time of disconnection of the second contact exceeds the preset time threshold. If it exceeds, it needs to be manually reset before the elevator can be controlled to resume running. If it does not exceed, the elevator is automatically controlled to resume running;

[0024] When the elevator is in the maintenance operation condition, when it is detected that the second contact is disconnected, the elevator is controlled to stop running; when it is detected that the second contact is connected, it needs to be manually reset to control the elevator to resume running.

[0025] Compared with the prior art, the present invention has both the functions of wire rope status detection and stranded condition detection. When installing the wire rope end detection device, there is no need to loosen the installed wire rope end, thereby reducing labor costs. The shape of the rope end contact part of the switch plate can be flexibly selected according to the arrangement of the rope end, and it has strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0027] Figures 1 to 3 This is a structural schematic diagram of a wire rope end detection device according to Example 1;

[0028] Figure 4 This is a structural schematic diagram of a wire rope end detection device according to Embodiment 2;

[0029] Figure 5 This is a schematic structural diagram of a wire rope end detection device according to Example 3. DETAILED DESCRIPTION

[0030] The following describes the implementation methods of the present invention through specific specific embodiments, and those skilled in the art can fully understand other advantages and technical effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through different specific implementation methods, and the details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without deviating from the overall design concept of the invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other in the absence of conflict. The following exemplary embodiments of the present invention can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary specific embodiments to those skilled in the art.

[0031] Example 1

[0032] like Figures 1 to 3 As shown, this embodiment provides a wire rope end detection device including a switch plate 3, a first type of mounting seat 4, a second type of mounting seat 8, a switch assembly 7, a spring 9, a limit seat 10 and a rotary hinge 11.

[0033] The first type of mounting seat 4 is fixedly mounted on the upper part of the rope head beam 2 for fixing the rope head of the wire rope near the rope head 1 of the wire rope; the second type of mounting seat 8 has a first mounting surface and a second mounting surface, the second type of mounting seat 8 is fixedly mounted on the first type of mounting seat 4 through the first mounting surface, and the switch assembly 7 is mounted on the second mounting surface; the first mounting surface is perpendicular to the second mounting surface. The extension length of the second mounting surface matches the length of the switch plate 3.

[0034] The switch plate 3 includes a rope end contact portion, a connection portion and a switch trigger portion; the connection portion is fixed to the top of the first mounting surface of the second type mounting seat 8 by a rotating hinge 11, so that the switch plate can rotate around the top of the first mounting surface and trigger the switch assembly 7 by rotation. The switch plate 3 can be adjusted up and down through the second type mounting seat 8 and the first type mounting seat 4 to adapt to the height of the rope end 1. The switch plate 3 is an L-shaped plate as a whole, and the rope end contact portion, the connection portion and the switch trigger portion can be different parts of the whole plate, or they can be several independent parts connected and combined by fasteners. The way in which several independent parts are connected and combined by fasteners is more convenient to adapt to the arrangement of different rope ends 1.

[0035] The limit seat 10 is fixed on one side of the connecting part close to the rope head contact part, one end of the spring 9 is connected to the limit seat 10, and the other end is connected to the first type of mounting seat 4; the tension applied by the spring 9 to the switch plate makes the rope head contact part always in contact with the rope head 1; the first type of mounting seat 4 can also realize forward and backward movement on the rope head beam 2.

[0036] The wire rope end detection device is connected to the rope end beam 2 through a first type mounting seat 4 via a pressing block 5 and a first type bolt assembly 6.

[0037] The cross section of the first type of mounting seat 4 is an L-shaped structure, and two waist-shaped holes are opened on the lower side of the L-shape to adapt to different models of rope head beams 2. Two waist-shaped holes are also opened on the upper side of the L-shape for connecting with the second type of mounting seat 8. The first type of mounting seat 4 can be bent from a steel plate or a profile. The width is set according to the arrangement of different rope head beams 2. Preferably, most rope head beams 2 can be handled by a suitable length and waist-shaped holes.

[0038] The pressing block 4 and the first type of bolt assembly 6 are preferably elevator guide rail pressing blocks, and the sizes of the two are matched, and can adapt to the flange of the rope head beam 2, and can match the H-shaped steel rope head beam 2 and the rope head 1 composed of two channel steels.

[0039] In the wire rope end detection device, the switch plate 3 is in contact with the rope end 1. The switch plate 3 can be in contact with all rope ends 1, and the switch plate 3 can be lifted when any rope end 1 rises.

[0040] When the rope end 1 is in a normal state and the elevator is stationary, the switch trigger part is at a preset distance from the switch assembly 7, the contacts of the switch assembly 7 are connected, and the rope end contact part contacts all rope ends; when the rope ends are in an abnormal state, at least one rope head lifts the rope end contact part, so that the development trigger part triggers the switch assembly, and the contacts of the switch assembly are disconnected.

[0041] The length extension of the switch plate 3 is equivalent to the distance between the ends of the wire rope, so that the calculated rise of the rope end 1 is proportional to the trigger stroke of the switch assembly 7, and the ratio is the extension length of the vertical plane. That is, the preset distance is calculated based on the minimum value of the rise corresponding to a single rope end in an abnormal state. The abnormal state refers to the position state of the corresponding rope end when a single wire rope is broken, a car or counterweight is stranded, or a single wire rope is broken.

[0042] The switch assembly 7 is preferably a limit switch, which can be a swing arm limit switch or a contact limit switch. According to different limit switch structures, a corresponding switch plate 3 can be designed to trigger it.

[0043] The rotating hinge 11 is a standard part, and both pages have round holes, which can be connected to the threaded holes on the switch plate 3 by screws, and the connection method can also be fixed by bolt assemblies.

[0044] The second type of bolt assembly 12 is connected through the threaded hole on the second type of mounting seat 8, and can also be connected by a bolt assembly. The limit seat 10 is provided with a threaded hole and a round hole. The threaded hole is used to connect with the switch plate 3, and the round hole is used to hook the spring 9. The spring force of the spring 9 can trigger the switch to reset itself, and the elongation matches the switch stroke.

[0045] The working principle of the wire rope end detection device in this embodiment is as follows:

[0046] When the wire rope is under normal load, the rope head 1 fluctuates within the normal range and will not trigger the switch of the wire rope head detection device. When a wire rope is broken or stranded, or the traction capacity supervision inspection is stranded, the rise of the rope head can be obtained through theoretical calculation, including the rise of the rope head after one wire rope is broken, the car is unloaded on the top floor and the counterweight is on the bottom floor to press the buffer, and the car is unloaded on the bottom floor to press the buffer and the counterweight is on the opposite floor. After calculation, it is set according to the minimum value of the rope head height.

[0047] When the rope head reaches the minimum triggering height, it will drive the switch plate 3 to rotate around the end of the second type mounting seat 8, and then trigger the switch group 7. At this time, the elevator control system is aware of the abnormality here, and the safety circuit is disconnected for protection.

[0048] When the steel wire rope head rises and triggers the switch assembly 7 when the elevator stops suddenly or the elevator car shakes up and down, the rope head will drop after recovery and stability. At this moment, the switch assembly 7 can be self-reset to ensure the normal operation of the elevator.

[0049] Example 2

[0050] like Figure 4 As shown, the wire rope end detection device provided in this embodiment can be installed on the rope end beams 2 of two channel steel structures through the first type of mounting seat 4 through the pressure block 5 and the first type of bolt assembly 6, and the left and right distance can be adjusted.

[0051] The switch plate 3 is connected to the end of the wire rope head 1. To cope with the situation where 6 rope heads are arranged in parallel, the end can be adjusted to a horizontal rectangular size to meet the requirement that the switch plate 3 is pressed on the 6 rope heads at the same time. Thus, the switch plate 3 can be triggered when any wire rope head 1 rises.

[0052] Example 3

[0053] like Figure 5As shown, the wire rope end detection device provided in this embodiment, when corresponding to the circular arrangement of 6 wire rope ends, the connection part of the switch plate 3 can be changed into a circular plate, which is used to press the 6 rope ends at the same time to play a triggering role. The first type of mounting seat 4 can be designed as a small-sized L-shaped plate, and the bolt assembly can be installed by drilling holes on the original rope end beam 2 on site.

[0054] Example 4

[0055] In the above embodiment, the switch assembly 3 may be configured with only one pair of contacts, which are connected to the safety circuit. When the switch assembly 3 is disconnected, the safety circuit is cut off and the elevator brakes. When the first contact is reconnected, the safety circuit is reconnected, and the elevator can automatically resume operation. However, there are certain safety hazards.

[0056] In the wire rope end detection device provided in this embodiment, the switch assembly 3 has a first contact and a second contact, the first contact is connected to the safety circuit, and the second contact is connected to the control circuit.

[0057] When the first contact is disconnected, the safety circuit is cut off and the elevator brakes. When the first contact is reconnected, the safety circuit is reconnected. At this time, the elevator control system also controls the elevator according to the action and reset state of the second contact state of the wire rope end detection device, and selects whether to automatically reset without manual intervention or manually reset with manual intervention.

[0058] Therefore, this embodiment also provides an elevator control method, in which when the elevator is in normal operating condition, the elevator control system controls the elevator according to the action and reset time of the second contact of the wire rope end detection device;

[0059] When the elevator is in normal operating conditions, when it is detected that the second contact is disconnected, the elevator is controlled to stop running; when it is detected that the second contact is connected, it is determined whether the time when the second contact is disconnected exceeds the preset time threshold. If it exceeds, manual reset is required to control the elevator to resume running. If it does not exceed, the elevator is controlled to resume running automatically.

[0060] When the elevator is under maintenance, when it is detected that the second contact is disconnected, the elevator is controlled to stop running; when it is detected that the second contact is connected, manual reset is required to control the elevator to resume running.

[0061] By judging the disconnection time of the second contact, misjudgment of some abnormalities other than the wire rope itself or abnormal conditions can be avoided, and unnecessary manual intervention can be reduced.

[0062] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. A wire rope end detection device, characterized in that: It includes a switch plate, a first-type mounting seat, a second-type mounting seat, a switch assembly, a spring, a limit seat and a rotary hinge; The first type of mounting seat is fixedly mounted on the upper part of the rope head beam for fixing the rope head of the steel wire rope, close to the rope head of the steel wire rope; The second type of mounting seat has a first mounting surface and a second mounting surface, the second type of mounting seat is fixedly mounted on the first type of mounting seat via the first mounting surface, and the switch assembly is mounted on the second mounting surface; the first mounting surface is perpendicular to the second mounting surface; The switch plate comprises a rope end contact portion, a connecting portion and a switch trigger portion; the connecting portion is fixed to the top of the first mounting surface of the second type mounting seat by a rotating hinge, so that the switch plate can rotate around the top of the first mounting surface; The limit seat is fixed on one side of the connection part close to the rope head contact part, one end of the spring is connected to the limit seat, and the other end is connected to the first type of mounting seat; the tension applied by the spring to the switch plate makes the rope head contact part always contact with the rope head; When the rope ends are in a normal state and the elevator is stationary, the switch trigger part is at a preset distance from the switch assembly, the contacts of the switch assembly are connected, and the rope end contact part contacts all rope ends; when the rope ends are in an abnormal state, at least one rope head lifts the rope end contact part, so that the development trigger part triggers the switch assembly, and the contacts of the switch assembly are disconnected.

2. The wire rope end detection device according to claim 1, characterized in that: The wire rope end detection device also includes a pressing block and a first type of bolt assembly; the first type of mounting seat is fixed on the rope end beam through the pressing block and the first type of bolt assembly.

3. The wire rope end detection device according to claim 2, characterized in that: The cross section of the first type of mounting seat is an L-shaped structure, with a waist-shaped hole at the fixing position with the rope head beam, and also with a waist-shaped hole at the fixing position with the second type of mounting seat.

4. The wire rope end detection device according to claim 1, characterized in that: The preset distance is calculated based on the minimum value of the rise amount corresponding to a single rope head in an abnormal state.

5. The wire rope end detection device according to claim 4, characterized in that: The abnormal state of the rope end refers to the position state of the corresponding rope end when a single steel wire rope is broken, a car or a counterweight is stranded, or a single steel wire rope is broken.

6. The wire rope end detection device according to claim 1, characterized in that: The shape of the rope end contact portion is adapted to the arrangement of the rope ends.

7. The wire rope end detection device according to claim 1, characterized in that: The switch assembly includes a rocker limit switch or a contact limit switch.

8. The wire rope end detection device according to claim 1, characterized in that: The switch assembly has a first contact and a second contact, the first contact is connected to the safety circuit, and the second contact is connected to the control circuit.

9. An elevator control method, characterized in that: The elevator control system controls the elevator according to the action and reset time of the second contact of the wire rope end detection device, and the wire rope end detection device is the wire rope end detection device according to claim 8; When the elevator is in normal operation, when it is detected that the second contact is disconnected, the elevator is controlled to stop running; when it is detected that the second contact is connected, it is judged whether the time of disconnection of the second contact exceeds the preset time threshold. If it exceeds, it needs to be manually reset before the elevator can be controlled to resume running. If it does not exceed, the elevator is automatically controlled to resume running; When the elevator is in the maintenance operation condition, when it is detected that the second contact is disconnected, the elevator is controlled to stop running; when it is detected that the second contact is connected, it needs to be manually reset to control the elevator to resume running.

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