Elevator diversion sheave steel wire rope disengagement detection device and elevator system

Abstract

The invention discloses an elevator diversion sheave steel wire rope disengagement detection device which comprises a brittle net-shaped support and a microswitch assembly. The brittle net-shaped support is provided with a trigger face, a trigger rod, a first fixing face and a second fixing face. The brittle net-shaped support is fixed to a mounting plate of the diversion sheave through the first fixing face, so that the trigger face is axially parallel to the diversion sheave, the projection of the trigger face in the radial direction is overlapped with a sheave groove of the diversion sheave, and a first preset gap is formed between the trigger face and the diversion sheave. The trigger rod is fixed in the brittle net-shaped support, and one end of the trigger rod protrudes out of the second fixing face. The microswitch assembly is provided with a trigger arm and a microswitch, the microswitch assembly is fixed to the second fixing face, and a second preset gap is formed between the trigger arm and the trigger rod; the fragile net-shaped support has preset breaking force, when force borne by the trigger face is larger than the preset breaking force, the trigger face is broken to enable the trigger rod to make contact with the trigger arm, and the trigger arm acts to enable the microswitch to act.

Description

Technical Field

[0001] The invention relates to the technical field of elevator safety, and in particular to an elevator reverse rope wheel wire rope escape detection device and an elevator system. Background Art

[0002] The prior art has the following limitations in the detection technology of elevator anti-roping wheel wire rope escape failure.

[0003] For example, the Chinese patent document (CN201510123456.X) discloses the use of laser sensors to monitor the position of the wire rope, but there is a detection blind spot and it is unable to detect the overall displacement risk caused by the failure of the anti-ropes pulley bearing.

[0004] Some technical solutions use complex laser, infrared sensing and other technologies. Although they can achieve real-time monitoring, the equipment is expensive, installation and maintenance requirements are high, and they are easily disturbed by environmental factors such as dust, vibration, oil or light changes, resulting in false disconnection of the safety circuit, with a false alarm rate of ≥ 1×10 -4 / Hour.

[0005] There are also some methods based on tension detection to indirectly judge the state of the wire rope, but this method is not sensitive to the slight changes in the early stage of the wire rope coming out, and cannot detect potential dangers in time. In addition, since mechanical and photoelectric sensors need to be cleaned and calibrated regularly, the operation and maintenance costs are high. The existing technology is difficult to achieve an ideal balance in terms of overall reliability, cost-effectiveness and real-time performance.

[0006] Therefore, how to monitor the elevator anti-rope pulley wire rope escape failure in real time and accurately is a technical problem currently faced. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides an elevator anti-roping wheel wire rope escape detection device, comprising a brittle mesh bracket and a micro switch assembly;

[0008] The fragile mesh support has a trigger surface, a trigger rod, a first fixing surface and a second fixing surface;

[0009] The brittle mesh bracket is fixed to the mounting plate of the anti-ropes wheel through the first fixing surface, so that the trigger surface is parallel to the axial direction of the anti-ropes wheel, the projection of the trigger surface in the radial direction overlaps with the wheel groove of the anti-ropes wheel, and there is a first preset gap between the trigger surface and the anti-ropes wheel;

[0010] The trigger rod is fixed inside the fragile mesh bracket, and one end of the trigger rod protrudes from the second fixing surface;

[0011] The micro switch assembly comprises a trigger arm and a micro switch, the micro switch assembly is fixed on the second fixed surface, and a second preset gap is formed between the trigger arm and the trigger rod;

[0012] The brittle mesh support has a preset breaking force. When the force applied to the trigger surface is greater than the preset breaking force, the trigger surface breaks so that the trigger rod contacts the trigger arm, and the trigger arm moves so that the micro switch moves.

[0013] Preferably, the micro switch has at least one pair of normally closed contacts, and when the normally closed contacts are disconnected, the safety circuit of the elevator is cut off.

[0014] Preferably, the brittle mesh support is a honeycomb or diamond grid structure, and the nodes of the grid structure are thin-necked structures with a diameter not greater than 2 mm.

[0015] Preferably, the grid structure also has holes at the nodes.

[0016] Preferably, the second preset gap is 1 to 2 mm.

[0017] Preferably, the material of the brittle mesh support is polylactic acid PLA, acrylic or photosensitive resin.

[0018] Preferably, the preset breaking force is no more than 50N.

[0019] The present invention also provides an elevator system, comprising a main controller and at least one anti-ropes pulley, wherein the elevator anti-ropes pulley wire rope escape detection device is respectively installed on the left and right sides and the lower side of the anti-ropes pulley;

[0020] The elevator system also includes a safety control circuit, which is electrically connected to the micro switch and is communicatively connected to the main controller; after the safety control circuit detects a disconnection signal from the micro switch, it sends a stop signal to the elevator system.

[0021] Preferably, after the safety control circuit detects the disconnection signal of the micro switch, it sends a fault code or a status signal of the micro switch to the elevator system.

[0022] Preferably, the elevator system further comprises a micro switch self-test device, and the micro switch self-test device is used to detect whether the contacts of the micro switch are failed.

[0023] Compared with the prior art, the present invention reasonably installs a micro switch assembly on the anti-ropes pulley and utilizes the high sensitivity of the micro switch to tiny displacement changes. Through the mechanical-electrical linkage design of the brittle mesh bracket and the micro switch, dual fault detection and redundant safety protection are implemented to achieve reliable detection, thereby discovering potential dangers in advance, solving the problems of large detection blind spots and low reliability in the prior art, and providing strong support for taking timely measures to ensure passenger safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0025] Figure 1 It is a front view schematic diagram of a reverse rope pulley equipped with an elevator reverse rope pulley wire rope escape detection device according to Example 1;

[0026] Figure 2 It is a side view of a reverse rope pulley installed with an elevator reverse rope pulley wire rope escape detection device according to Example 1;

[0027] Figure 3 and Figure 4 This is a schematic structural diagram of a device for detecting the escape of a steel wire rope from an elevator anti-roping pulley according to Embodiment 1;

[0028] Figure 5 It is a partial schematic diagram of a node of the grid structure of the brittle mesh stent of Example 1;

[0029] Figure 6 This is a schematic diagram of the safety control circuit of Example 2. 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 5 As shown, this embodiment provides an elevator anti-roping wheel wire rope escape detection device, including a brittle mesh bracket 1 and a micro switch assembly 2;

[0033] The fragile mesh support 1 has a trigger surface 11, a trigger rod 12, a first fixing surface 13 and a second fixing surface 14;

[0034] The brittle mesh support 1 is fixed to the mounting plate 201 of the anti-ropes wheel 200 via the first fixing surface 13, so that the trigger surface 11 is parallel to the anti-ropes wheel 200 in the axial direction, the projection of the trigger surface 11 in the radial direction overlaps with the wheel groove of the anti-ropes wheel 200, and the trigger surface 11 has a first preset gap with the anti-ropes wheel steel 200;

[0035] The trigger rod 12 is fixed inside the fragile mesh support 1, and the trigger rod 12 is made of stainless steel ( ), one end of the trigger rod 12 is inserted into the central hole 15 of the brittle mesh bracket 1 and fixed by bonding, and the other end of the trigger rod 12 protrudes from the second fixing surface 14;

[0036] The micro switch assembly 2 comprises a trigger arm 21 and a micro switch 22 . The micro switch assembly 2 is fixed on the second fixing surface 14 . The trigger arm 21 and the trigger rod 12 have a second preset gap. The second preset gap is 1 to 2 mm.

[0037] The brittle mesh support 1 has a preset breaking force. When the force applied to the trigger surface 11 is greater than the preset breaking force, the trigger surface 11 breaks so that the trigger rod 12 contacts the trigger arm 21 . The trigger arm 21 actuates so that the micro switch 22 actuates.

[0038] The micro switch 22 has at least one pair of normally closed contacts. When the normally closed contacts are disconnected, the safety circuit of the elevator is cut off.

[0039] The micro switch 22 is, for example, a two-way trigger type micro switch (such as Schneider ZV2-N22), and the normally closed contact NC is connected in series to the elevator safety circuit.

[0040] The brittle mesh support has a honeycomb or diamond grid structure that maximizes the surface area / weight ratio and ensures uniform stress distribution at low strength.

[0041] The nodes of the grid structure are thin neck structures 17 with a diameter of no more than 2 mm, such as hourglass-shaped thin necks (1.5 mm). Controllable breaking points are achieved, and the switch action is triggered only when more than half of the nodes are broken (the anti-ropes are out of action), thus avoiding malfunctions caused by random breakages; the nodes of the grid structure also have holes 18.

[0042] In terms of manufacturing method and materials, brittle materials such as polylactic acid PLA, acrylic or photosensitive resin are used, which have no plastic deformation when breaking, ensuring that the trigger rod can be quickly separated. The preset breaking force is no more than 50N.

[0043] The adaptability of the above materials is slightly different and can be selected according to different environmental conditions. Polylactic acid PLA is suitable for dry environments, with a 3D printing layer thickness of 0.2mm and a breaking force of 45±3N; acrylic has a 30% increase in oil resistance, laser cutting and molding, and a breaking force of 50±2N; photosensitive resin is suitable for high-precision scenes, printed using SLA technology, with a breaking force of 38±5N and an accuracy of ±0.05mm.

[0044] The example of realizing the detection of the steel rope coming out of the elevator anti-roping wheel in this embodiment is as follows:

[0045] When the anti-rope pulley undergoes overall longitudinal displacement due to bearing failure, loose installation or impact load, the displaced anti-rope pulley presses the trigger surface 11 of the brittle mesh support 1, causing stress concentration at the nodes of the mesh structure, thereby causing the trigger surface 11 of the brittle mesh support 1 to break, and the trigger rod 12 to deflect downward, triggering the microswitch trigger arm 21, and the normally closed contact of the microswitch is disconnected, cutting off the safety circuit and causing the elevator to brake urgently.

[0046] When the wire rope deviates laterally due to wear, vibration or installation deviation and escapes from the anti-rope pulley groove, the escaped wire rope continues to exert a large pressure on the trigger surface 11 of the brittle mesh bracket 1 installed laterally, causing the trigger surface 11 to break, the trigger rod 12 to deviate outward or the wire rope directly collides with the trigger arm 21 of the micro switch, thereby disconnecting the normally closed contact of the micro switch, thereby cutting off the safety circuit and emergency braking of the elevator.

[0047] This embodiment indirectly determines whether the anti-ropes are displaced by means of the structural deformation of the brittle bracket. Therefore, this solution does not need to directly detect the position of the anti-ropes, thereby reducing the detection cost. Since the micro switch mechanical structure is triggered by physical contact, the delay is ≤10ms, which is much faster than the photoelectric or laser sensor. Therefore, this device can respond to the anti-ropes fault in real time, and the mechanical structure is not affected by oil and dust. It can work normally in an environment with an operating temperature of -25°C to 85°C and a humidity of ≤95% RH. It is suitable for the harsh environment of the elevator shaft and has very good anti-interference performance.

[0048] The brittle mesh bracket in this embodiment transforms mechanical deformation into an electrically triggered physical linkage mechanism, converts the mechanical failure of the anti-ropes system into an electrical signal, realizes double fault detection, meets the high reliability of EN 81-20 Cat.3 / PLd safety level, and has a low maintenance cost of less than 20 yuan per unit. It has passed the elevator safety standard verification, can be adapted to various types of traction elevators, and significantly reduces the risk of falling caused by wire rope escape.

[0049] Example 2

[0050] This embodiment provides an elevator system, including a main controller and at least one anti-roping pulley, such as Figure 1 As shown, a set of elevator anti-rope wheel wire rope escape detection devices are respectively installed on the left and right sides and the lower side of the anti-rope wheel.

[0051] The elevator system also includes a safety control circuit, which is electrically connected to the micro switch and is communicatively connected to the main controller; after the safety control circuit detects a disconnection signal from the micro switch, it sends a stop signal to the elevator system.

[0052] Safety control circuit example Figure 6As shown, the normally closed contacts of three micro switches are connected in series to control the on and off of the safety relay coil, and the normally open contacts of the safety relay are connected to the safety circuit. The safety relay is, for example, a Siemens 3SK1 safety relay with a contact rated current of 2A / 250VAC. The signal line uses a shielded twisted pair (AWG18) with a grounding resistance of ≤1Ω.

[0053] In addition, after the safety control circuit detects the disconnection signal of the micro switch, it sends a fault code or a status signal of the micro switch to the elevator system.

[0054] The elevator system also includes a micro switch self-test device, which is used to detect whether the micro switch contacts are invalid. The micro switch self-test device can be exemplarily a monitoring circuit composed of a PLC. In addition to real-time monitoring of the micro switch contact status (DI input), the PLC performs a self-test operation when the elevator starts every day: the PLC sends a 5V pulse to the micro switch contact; monitors the contact response time, and if it is >10ms, it is determined to be contact oxidation or mechanical jamming, triggering a maintenance alarm; and records the fault code (E101: channel A response timeout; E102: channel B response timeout).

[0055] 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. An elevator reverse rope pulley wire rope escape detection device, characterized in that: Includes a brittle mesh bracket and a micro switch assembly; The fragile mesh support has a trigger surface, a trigger rod, a first fixing surface and a second fixing surface; The brittle mesh bracket is fixed to the mounting plate of the anti-ropes wheel through the first fixing surface, so that the trigger surface is parallel to the axial direction of the anti-ropes wheel, the projection of the trigger surface in the radial direction overlaps with the wheel groove of the anti-ropes wheel, and there is a first preset gap between the trigger surface and the anti-ropes wheel; The trigger rod is fixed inside the fragile mesh bracket, and one end of the trigger rod protrudes from the second fixing surface; The micro switch assembly comprises a trigger arm and a micro switch, the micro switch assembly is fixed on the second fixed surface, and a second preset gap is formed between the trigger arm and the trigger rod; The brittle mesh support has a preset breaking force. When the force applied to the trigger surface is greater than the preset breaking force, the trigger surface breaks so that the trigger rod contacts the trigger arm, and the trigger arm moves so that the micro switch moves.

2. The elevator reverse pulley wire rope escape detection device according to claim 1, characterized in that: The micro switch has at least one pair of normally closed contacts. When the normally closed contacts are disconnected, the safety circuit of the elevator is cut off.

3. The elevator reverse sheave wire rope escape detection device according to claim 1, characterized in that: The brittle mesh stent is a honeycomb or diamond grid structure, and the nodes of the grid structure are thin neck structures with a diameter not greater than 2 mm.

4. The elevator reverse sheave wire rope escape detection device according to claim 3, characterized in that: The grid structure also has holes at the nodes.

5. The elevator reverse rope pulley wire rope escape detection device according to claim 1, characterized in that: The second preset gap is 1 to 2 mm.

6. The elevator reverse rope pulley wire rope escape detection device according to claim 1, characterized in that: The material of the brittle mesh support is polylactic acid PLA, acrylic or photosensitive resin.

7. The elevator reverse pulley wire rope escape detection device according to claim 1, characterized in that: The preset breaking force is no more than 50N.

8. An elevator system, comprising a main controller and at least one return pulley, characterized in that: The elevator anti-rope wheel wire rope escape detection device as described in any one of claims 1 to 7 is respectively installed on the left and right sides and the lower side of the anti-rope wheel; The elevator system also includes a safety control circuit, which is electrically connected to the micro switch and is communicatively connected to the main controller; after the safety control circuit detects a disconnection signal from the micro switch, it sends a stop signal to the elevator system.

9. The elevator system according to claim 8, characterized in that After the safety control circuit detects the disconnection signal of the micro switch, it sends a fault code or a status signal of the micro switch to the elevator system.

10. The elevator system according to claim 8, characterized in that The elevator system further comprises a micro switch self-test device, and the micro switch self-test device is used to detect whether the contacts of the micro switch are invalid.

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