An elevator maintenance work automation detector

Abstract

The utility model provides a kind of elevator maintenance operation automation detector, through the micro-blade structure of surface protrusion, under the direct puncture of clamping force steel band sheath, and form stable electrical contact with internal steel wire.This design avoids the complex process that traditional detection needs to be pre-debonded, while ensuring that the contact point directly acts on the steel wire body, reduces the poor contact caused by the residual or oxidation layer of sheath, the number of micro-blade copper row is equal to the number of steel band core and the spacing corresponds, to ensure that each steel wire is independently detected, eliminate the security risks caused by steel wire arrangement misplacement or missed detection, realize full coverage, upper contact module, lower contact module and clamp bracket adopt quick disassembly and assembly structure, maintenance personnel can complete detector replacement or calibration with one hand.

Description

Technical Field

[0001] This utility model relates to the field of elevator auxiliary component manufacturing technology, specifically an automated detector for elevator maintenance operations. Background Technology

[0002] Steel belt driven elevators use steel belts instead of steel wire ropes to pull the elevator car. Compared with traditional steel wire ropes, steel belts have advantages such as being less prone to breakage, less prone to derailment, having greater friction, and effectively preventing slippage. As a result, they are becoming more and more widely used. Elevator steel belt clamps are used to clamp the steel belt at the connection point after it is connected to the elevator, preventing the connection of the steel belt at the connection point from becoming loose. Traditional elevator traction belt clamps use two clamping plates to hold the elevator connection point, and then bolts are used to fix the two clamping plates to the elevator connection point to complete the connection between the steel belt clamp and the elevator connection point. Because the steel wire rope in the steel belt is subjected to long-term bending and friction, it is easy for the elevator steel wire rope to break, causing elevator safety accidents. Therefore, monitoring the traction steel belt is an important part of daily elevator maintenance and inspection. However, because the steel belt is covered with a protective rubber layer and generally has a multi-core structure, it is difficult to observe the steel belt breakage with the naked eye, and it is also inconvenient for inspection and repair.

[0003] To address this, the existing technology provides a wiring clamp device for detecting broken wires in elevator steel strips (patent number not provided). This device comprises an upper cover and a lower base that interlock. The upper cover has multiple wire-separating grooves inside, and the lower base has spaced copper busbars at corresponding positions to the wire-separating grooves. The wire-separating grooves and copper busbars clamp the de-adhesive steel cores inside the elevator steel strip. The extended portion of the copper busbars connects to a detection circuit board. The wire-separating grooves in the upper cover separate the de-adhesive steel cores in the steel strip, and each steel core is pressed into contact with the spaced copper busbars in the lower base to achieve connection with the detection circuit board. This design is simple in structure, low in manufacturing cost, and convenient for testing and repairing steel strips.

[0004] However, the above technical solution has the following drawbacks: the device clamps the de-adhesive steel core between the slotted groove of the upper cover and the copper busbar of the lower base, but the arrangement of the steel core in the flat steel strip may have slight offset or bending. If the spacing between the slotted groove and the copper busbar does not fully consider the actual position of the steel core, some steel cores may not be effectively clamped, resulting in a loose connection or poor contact, which may lead to the circuit misjudging the continuity of the steel core and reducing the reliability of the system. Utility Model Content

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automated detector for elevator maintenance operations, characterized in that it includes: a clamping bracket having a through cavity for inserting an elevator steel belt; The clamping plate can be moved back and forth relative to the clamping bracket in the clamping direction to press or release the inserted elevator steel belt; The guide rod has one end fixed to the clamping plate and the other end extending out of the top beam of the clamping bracket and is equipped with an adjusting screw, which is used to apply an adjustable clamping force to the clamping plate. The upper contact module and the lower contact module are respectively fixed to the pressing surface of the clamping plate and the corresponding bearing surface of the clamping bracket; The upper contact module and / or lower contact module are provided with micro-blade copper busbars that are equal to the number of cores of the elevator steel strip and have a corresponding spacing. The surface of the micro-blade copper busbars has protrusions, which are configured to pierce the steel strip sheath under clamping force and form electrical contact with the corresponding steel wire. The micro-blade copper busbars are insulated from each other and embedded in the corresponding insulating substrates, and are all connected in parallel to the circuit interface. The insulating substrates are mounted on the clamping plate, so that all the steel wires of the inserted steel strip are short-circuited inside the clamp, thereby forming a closed monitoring loop that can be led out externally.

[0006] The protrusions of the micro-blade copper busbar are triangular or quadrangular pyramids, and the blade height of the micro-blade copper busbar is 0.10~0.20 mm.

[0007] As a preferred embodiment of this application, the surface of the micro-blade copper busbar is coated with a gold plating layer with a thickness of 0.3 μm to 1.0 μm.

[0008] As a preferred embodiment of this application, an elastic element is provided between the clamping plate and the top beam of the clamping bracket to maintain a contact pressure ≥1.2 N / mm² when the temperature changes or the steel strip creeps.

[0009] As a preferred embodiment of this application, the elastic element is any one of a disc spring, a wave spring, or a Bellwell washer, with a compression stroke ≥ 0.5 mm.

[0010] As a preferred embodiment of this application, the exit end of the clamp bracket is provided with a rounded transition to reduce the bending fatigue stress of the steel strip.

[0011] Furthermore, the insulating substrate is made of high-temperature resistant engineering plastic with a heat resistance temperature ≥150℃, and has a self-lubricating chamfer in the contact area with the steel strip.

[0012] Furthermore, the circuit interface is a two-core waterproof connector with a protection level of ≥IP65, and its lead wires are connected to an external electrical control box via shielded cables.

[0013] Furthermore, the clamping bracket and clamping plate are made of aluminum alloy or stainless steel, and the surface is anodized or passivated, with a salt spray test of ≥720 h.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This application utilizes a micro-blade structure with raised surfaces to directly pierce the steel strip sheath under clamping force, forming stable point contact with the internal steel wires. This design avoids the complex process of pre-removing adhesive required in traditional testing, while ensuring that the contact point directly acts on the steel wire body, reducing poor contact caused by sheath residue or oxide layer. The number of micro-blade copper busbars is equal to the number of steel strip cores and the spacing is corresponding, ensuring that each steel wire is independently tested, eliminating safety hazards caused by misalignment or missed detection of steel wires, achieving full coverage. The upper contact module, lower contact module, and clamping bracket adopt a quick-disassembly structure, allowing maintenance personnel to complete detector replacement or calibration with one hand. Attached Figure Description

[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is the front view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is a circuit diagram of the present invention.

[0016] In the diagram: 1. Clamping bracket; 11. Arc transition; 2. Clamping plate; 3. Guide rod; 4. Screw; 5. Upper contact module; 6. Lower contact module; 7. Micro-blade copper busbar; 71. Protrusion; 72. Insulating substrate; 8. Circuit interface; 9. Elastic element; 10. Elevator steel belt. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] The applicant hereby declares that the clamps in this application are mainly located in the straight redundant section of the machine room, and their geometric length is locked. Both ends of the steel belt are locked to the load-bearing beams on the car side and counterweight side by the original factory rope head cone sleeves, respectively. After passing through the traction sheave / reverse sheave in the middle, the length of the entire steel belt is fixed. As long as the rope head plate does not move, the straight section length between the clamps and the cone sleeves remains constant. When the elevator is running, the traction sheave drives the steel belt through friction in the wrap-around area, and there is no relative slippage between the steel belt and the sheave surface (normally no slippage). Therefore, apart from a slight elastic elongation (<0.1%) in the corner area, the straight section of the machine room hardly undergoes longitudinal displacement. This steel strip only undergoes slight elastic expansion and contraction (±0.2 mm) during the elevator's lifting and lowering process, which is invisible to the naked eye and will not slip within the clamp. If the steel strip in the "running area" breaks, the steel strip in the "dead zone" on the fixed beam of the machine room (i.e., the steel strip section with the clamp installed) will not slip off or be broken, but will immediately lose tension. The closed loop resistance in the detection clamp will change from milliohms to ∞, and the electrical control box will issue a strip breakage alarm within 0.1 s.

[0019] like Figure 1-4 As shown, an automated detector for elevator maintenance operations is characterized by comprising: a clamping bracket 1 having a through cavity for inserting an elevator steel belt 10; The clamping plate 2 can be moved back and forth relative to the clamping bracket 1 in the clamping direction to press or release the inserted elevator steel belt 10; The guide rod 3 is fixed at one end to the clamping plate 2 and extends out of the top beam of the clamping bracket 1 and is provided with an adjusting screw 4, which is used to apply an adjustable clamping force to the clamping plate 2. The upper contact module 5 and the lower contact module 6 are respectively fixed to the pressing surface of the clamping plate 2 and the corresponding bearing surface of the clamping bracket 1; The upper contact module 5 and / or the lower contact module 6 are provided with micro-blade copper busbars 7 with the same number of cores as the elevator steel belt 10 and corresponding spacing. The surface of the micro-blade copper busbar 7 has protrusions 71, which are configured to pierce the steel belt sheath under clamping force and form electrical contact with the corresponding steel wire. The micro-blade copper busbars 7 are insulated from each other and embedded in the corresponding insulating substrates 72, and are all connected in parallel to the circuit interface 8. The insulating substrates 72 are mounted on the clamping plate 2, so that all the steel wires of the inserted steel strip are short-circuited inside the clamp, thereby forming a closed monitoring loop that can be led out externally.

[0020] In this embodiment, for ease of monitoring, three parallel clamping brackets 1 are set on the same clamping plate 2. The guide rod 3, in conjunction with the screw 4, limits and fixes the clamping bracket 1. In this application, the micro-blade copper busbar 7 is also connected to the clamping bracket 1 by a thread on its top to adjust the distance between the bottom of the micro-blade copper busbar 7 and the clamping plate 2 for the elevator steel belt 10. This design structure allows the three parallel clamping brackets 1 to be centrally set on the clamping plate 2, making the detection device compact, facilitating centralized installation and operation, simplifying the monitoring process, and improving monitoring efficiency.

[0021] Enhanced structural stability: The guide rod 3 also has a limiting and fixing function, ensuring that the position of the clamp bracket 1 is accurate and stable, avoiding the impact of structural shaking on the detection accuracy during the detection process, and ensuring the accuracy of the detection results.

[0022] Improved detection accuracy: The line grouping method combined with the micro-blade copper busbar 7-insertion design can accurately detect the condition of each steel wire. The interval subdivision group can capture steel wire breakage signals more meticulously and detect potential safety hazards in time.

[0023] Easy installation and maintenance: The overall structure is reasonably designed and the layout of each component is clear. It is easy to position and assemble during installation, and it is also easy to quickly locate the fault point during later maintenance, reducing maintenance costs and time.

[0024] Working principle Insert the 12-core steel strip into the clamping port → Tighten the adjusting screw 4 → Pierce the sheath with the micro-blade → The 12 steel wires simultaneously form cold welding contact with the upper and lower copper busbars → The 12 steel wires are short-circuited in parallel inside the clamp → The electrical control box injects constant current into the loop through the interface and monitors the total resistance R_total; if any steel wire breaks, R_total → ∞, triggering an alarm.

[0025] Beneficial effects a) No wire stripping required, installation time < 60 s; b) Does not damage the steel wire coating and sheath seal, increasing fatigue life by ≥ 30%; c) Loop resistance ≤ 50 mΩ, detection current only 5 mA, intrinsically safe; d) The same clamp can serve as both a fixed anchor and a detection electrode, reducing the number of parts by 40%.

[0026] Energy supply implementation No local power supply is required; the detection loop current is provided by a constant 5 mA current from the back-end control box.

[0027] The protrusion 71 of the micro-blade copper busbar 7 is a triangular or square pyramid. The blade height of the micro-blade copper busbar 7 is 0.10~0.20 mm. In this embodiment, a triangular pyramid with a 120° blade edge is selected, and a conical self-positioning is adopted to prevent lateral slippage; the pressure per unit area is approximately 1.2 × 10⁻⁶ mm. 9Pa can penetrate PU without damaging the steel wire coating.

[0028] Reference Model The micro-edge is machined using a micro-milling cutter, with a cutting height of 0.15 ± 0.02 mm and Ra ≤ 0.4 μm.

[0029] Beneficial effects Puncture force deviation <±5%, 12-core contact consistency is high.

[0030] (In this embodiment, for ease of monitoring, three parallel clamping brackets 1 are provided. Each clamping bracket 1 is mounted on a clamping plate 2. The guide rod 3 in this application can limit and fix the clamping bracket 1. The screw 4, in addition to limiting and fixing, is also used to insert the micro-blade copper busbar 7 into the corresponding elevator steel belt 10. The circuit diagram of this application divides the 12 groups of steel belts into three major groups. Each major group is further subdivided into four single series small groups of strokes at intervals.) The surface of the micro-blade copper busbar 7 is coated with a gold plating layer with a thickness of 0.3 μm to 1.0 μm. The Au layer potential is +0.34 V, which is <0.3 V different from that of the steel wire (Fe), thus inhibiting micro-galvanic corrosion. At the same time, the gold layer has a hardness of 80 HV, reducing fretting wear (reference model: plating solution: potassium gold cyanide, thickness 0.5 μm, hardness 130 HV (ASTM B488 Type II)). After 1000 h of salt spray, the contact resistance increase is <5 mΩ; the wear rate decreases by 70%, and the lifespan is >10 years.

[0031] An elastic element 9 is provided between the clamping plate 2 and the top beam of the clamping bracket 1 to maintain a contact pressure ≥1.2 N / mm² under temperature changes or steel strip creep. The reference model is 17-7PH stainless steel, GB / T 1972 standard, with a fatigue life >2×10 6 Second-rate.

[0032] The elastic element 9 is any one of a disc spring, a wave spring, or a Belleville washer, with a compression stroke ≥ 0.5 mm. In this embodiment, a disc spring with a stiffness of 20 N / 0.1 mm is preferred to compensate for the 0.06 mm elongation caused by the 80 ℃ temperature difference between aluminum and steel, and to maintain a constant pressure at the micro-blade-steel wire interface. The three types of springs are interchangeable, with different stiffness curves for design optimization. The wave spring has a low height and is suitable for 25 mm ultra-thin chucks; the Belleville washer is suitable for high loads of 300 N.

[0033] The outlet end of the clamp bracket 1 is provided with an arc transition 11 to reduce the bending fatigue stress of the steel strip. The R25 arc reduces the bending stress σ=M / W of the steel strip by 42% and increases the fatigue life by 1.8 times.

[0034] The insulating substrate 72 is made of high-temperature resistant engineering plastic (refer to model PEEK 450G, UL 94 V-0, CTI=300 V; where PEEK has a glass transition temperature of 143 ℃ and a continuous operating temperature of 250 ℃, ensuring that it will not soften during short-circuit faults), with a heat resistance temperature ≥150 ℃, and has a self-lubricating chamfer in the contact area with the steel strip.

[0035] The circuit interface 8 is a two-core waterproof connector with a protection level of ≥IP65. Its lead wires are connected to the external electrical control box via shielded cables.

[0036] Implementation principle The connector is IP67 protected, provides 5 mA constant current power, has a loop voltage drop of <0.25 V, and is intrinsically safe.

[0037] Workflow The electrical control box has a 12V DC → 5mA constant current source → detection clip → sampling voltage → CAN message.

[0038] Reference Model Connector: Binder 423 2-pin, IP67, 250 mating cycles Cable: LiYCY 2×0.25 mm², shielding layer grounded at one end Backend monitoring interface Physical layer: CAN 2.0B 125 kbps Protocol: CANopen 402, heartbeat 1 s Criteria: R > 500 Ω indicates wire breakage; ΔR > 10% indicates aging; double-ring difference > 5% indicates localized strand breakage. Beneficial effects Intrinsically safe current of 5 mA, meeting GB / T 7588-2020 Shaft Electrical Safety Transmission distance 200 m without repeaters Furthermore, the clamping bracket 1 and the clamping plate 2 are made of aluminum alloy or stainless steel, and the surface is anodized or passivated, with a salt spray test of ≥720 h.

[0039] Implementation principle 6061-T6 aluminum density 2.7 g / cm³, anodic oxide film 25 μm, salt spray 720 h; if the wellbore contains chlorine, 304 stainless steel can be selected, salt spray >1000 h.

[0040] Reference Model Aluminum: 6061-T6, σb=310 MPa Stainless steel: 06Cr19Ni10, σb=520 MPa Beneficial effects The machine weighs less than 120 g, allowing maintenance personnel to operate it with one hand. Corrosion depth <0.02 mm over 25 years, does not affect cutting edge height. Summary of Energy Supply & Back-End Monitoring (Applicable to all claims) Power supply: The detector itself has no battery. It is supplied with a 5mA pulse constant current (duty cycle 1%, average power consumption 0.3 mW) by the 12V intrinsically safe power supply of the background control box through a two-core shielded cable.

[0041] Monitoring logic: Continuity / disconnection criterion: R_loop > 500 Ω → Immediate wire breakage alarm Drift criterion: ΔR > 10% within 24 hours → Aging warning Symmetry criterion: Bi-ring difference > 5% → Local stock breakage warning Output interface: CAN 2.0B / Modbus-RTU, which can be directly connected to the elevator main control or IoT gateway to realize automated detection of maintenance operations and automatic generation of cloud reports (the external devices connected to this output interface are not the main invention content of this application, but are only used for explanation).

[0042] It should be added that the end clamping device of this application is not a sensor itself; it simply connects the 12-core steel strip into a closed loop electrically. The principle behind this is as follows: When the 12-core steel strip leaves the factory, the 12 steel wires are insulated from each other (wrapped in PU or rubber). Therefore, the entire steel strip can be considered as 12 independent small resistors. By connecting them end to end in a loop, we obtain a total loop resistance R_total. R_total = R1 + R2 + … + R12 If any one of the steel wires breaks, the series circuit is interrupted, and R_total → ∞; If the remaining cross-sectional area of ​​a wire decreases (e.g., due to a broken strand), its R_i will increase, and R_total will also increase accordingly.

[0043] The real indicator of a breakage is the back-end electrical control box—by simultaneously checking loop resistance, drift, and symmetry. Within 0.1 seconds, it can locate "which steel wire is broken" and output a CAN / Modbus alarm signal to the elevator controller to achieve real-time monitoring and dynamic alarm.

[0044] The electrical control box (usually installed in a control cabinet) supplies power to the clamp via a 4-core shielded cable and performs three functions internally: The electrical control box measures the total resistance from clamp A → steel wires 1~12 → clamp B → cable → electrical control box. If any wire breaks, the loop is interrupted, triggering a continuity alarm. If any strand of the steel wire breaks, the loop resistance increases, triggering a drift alarm.

[0045] The gold-plated copper busbar inside the chuck has a microstructure of "protrusions + cutting edge" on its surface; When adjusting screw 4 is tightened, the protrusion pierces the PU skin (only at the μm level) and forms a cold weld contact with the steel wire; Because of the displacement clamping plate 2 and guide rod 3, the 12 steel wires are subjected to uniform force, and there will be no "poor contact of a certain wire".

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An automated detector for elevator maintenance operations, characterized in that, include: The clamping bracket (1) has a through cavity for the elevator steel belt (10) to be inserted; The clamping plate (2) can be moved back in the clamping direction relative to the clamping bracket (1) to press or release the inserted elevator steel belt (10); The guide rod (3) is fixed at one end to the clamping plate (2) and extends out of the top beam of the clamping bracket (1) and is provided with an adjusting screw (4) for applying an adjustable clamping force to the clamping plate (2); The upper contact module (5) and the lower contact module (6) are respectively fixed to the pressing surface of the clamping plate (2) and the corresponding bearing surface of the clamping bracket (1); The upper contact module (5) and / or the lower contact module (6) are provided with micro-blade copper busbars (7) with the same number of cores as the elevator steel belt (10) and corresponding spacing. The surface of the micro-blade copper busbar (7) has protrusions (71), which are configured to pierce the steel belt sheath under clamping force and form electrical contact with the corresponding steel wire. The micro-blade copper busbars (7) are insulated from each other and embedded in the corresponding insulating substrates (72), and are all connected in parallel to the circuit interface (8). The insulating substrates (72) are installed on the clamping plate (2), so that all the steel wires of the inserted steel strip are short-circuited inside the clamp, thereby forming a closed monitoring loop that can be led out externally.

2. The automated elevator maintenance detection device as described in claim 1, characterized in that, The protrusions (71) of the micro-blade copper busbar (7) are triangular or quadrangular pyramids.

3. The automated elevator maintenance detection device as described in claim 1, characterized in that, The surface of the micro-blade copper busbar (7) is covered with a gold plating layer with a thickness of 0.3 μm to 1.0 μm.

4. The automated elevator maintenance detector as described in claim 3, characterized in that, An elastic element (9) is provided between the clamping plate (2) and the top beam of the clamping bracket (1) to maintain a contact pressure ≥1.2 N / mm² when the temperature changes or the steel strip creeps.

5. The automated elevator maintenance detection device as described in claim 4, characterized in that, The elastic element (9) is any one of a disc spring, a wave spring, or a Bellwell washer.

6. The automated elevator maintenance detection device as described in claim 1, characterized in that, The outlet end of the clamp (1) is provided with an arc transition (11).

7. The automated elevator maintenance detector as described in claim 1, characterized in that, The insulating substrate (72) is made of high-temperature resistant engineering plastic.

8. The automated elevator maintenance detection device as described in claim 1, characterized in that, The circuit interface (8) is a two-core waterproof connector, and its lead wires are connected to the external electrical control box through a shielded cable.

9. An automated detector for elevator maintenance operations as described in claim 1, characterized in that, The clamping bracket (1) and clamping plate (2) are made of aluminum alloy or stainless steel.

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