Length measuring device for multi-specification large-diameter elevator compensation chain

Abstract

The invention discloses a length measuring device for a multi-specification large-diameter elevator compensation chain. The length measuring device comprises a pressing assembly, a measuring assembly and a conversion module. The pressing assembly comprises a stabilizing assembly, an air cylinder and a downward pressing assembly. The stabilizing assembly, the air cylinder and the downward pressing assembly cooperate to tightly press the elevator compensation chain. The measuring assembly is located between the stabilizing assembly and the cylinder. Wherein the measuring assembly is used for collecting a linear displacement signal of an elevator compensation chain so as to independently complete length measurement of the all-plastic compensation chain; the conversion module is connected with the measurement assembly; the conversion module comprises a signal processing module and a data transmission module; wherein the signal processing module analyzes a sensor signal and counts the length, and the data transmission module outputs a length measurement result outwards. By arranging the inclination adjusting device, the coding wheel and the plastic-coated chain are in cross-shaped contact, the position of the coding wheel does not need to be adjusted again after the specification of the chain is changed, the model changing time is remarkably shortened, the operation cost is reduced, and the universality and adaptability of equipment are improved.

Description

Technical Field

[0001] This application belongs to the field of mechanical automation technology, specifically relating to a multi-specification large-diameter elevator compensation chain length measuring device. Background Technology

[0002] The elevator balancing compensation chain is a key component in the elevator system, used to balance weight changes and ensure smooth operation during ascent and descent. During the production of the compensation chain, its length needs to be measured, cut to size according to customer requirements, and packaged. Existing methods for measuring the length of compensation chains during transport can be broadly categorized into contact and non-contact methods. Contact methods utilize the friction of the compensation chain to drive a measuring wheel, measuring the number of rotations, or the rotation of the upper and lower tracks to move the compensation chain and read the number of rotations of the synchronous pulley. Non-contact methods typically use laser measurement, calculating the speed by the time difference between the emitted and received reflected laser light. Contact measurements suffer from reduced accuracy due to friction. Existing non-contact methods, such as using expensive laser sensors, have stringent environmental requirements and are not well-suited to factory needs. Therefore, developing a cost-effective, environmentally adaptable, non-contact elevator compensation chain length measuring device is crucial for improving measurement efficiency and reducing chain wear.

[0003] The most known related technology is patent application number 201710789581.5, entitled "An Electromechanical Elevator Compensating Chain Length Measuring Device." This device actively drives the main measuring wheel with a servo motor, and combines a linear displacement sensor to monitor the relative sliding displacement between the compensating chain and the synchronous belt in real time. A PLC dynamically adjusts the servo motor torque to compensate for friction fluctuation errors. Multiple sets of small clamping wheels and upper and lower synchronous belts are added to increase the contact area and stabilize the friction force. A pneumatic clamping mechanism holds the compensating chain to prevent detachment caused by surface unevenness. Through active driving, dynamic compensation, and hardware integration, the device solves the accuracy problems caused by chain slippage and friction fluctuations in traditional passive friction measurement, achieving high-precision automated length measurement.

[0004] The known related technology application number is 202410971502.2, entitled "An Adaptive Elevator Compensation Chain Length Measurement Method and Device". This patent uses inductive and distance sensors to detect the contour of the compensation chain in a non-contact manner. The sensor position is adaptively adjusted by a multi-axis motor driving a slide rail (vertical / longitudinal / lateral). The chain is stabilized by a four-way guide wheel limiting structure. Based on adaptive filtering and multi-level peak and valley detection algorithms, periodic signal features are extracted to dynamically compensate for distance measurement deviations, achieve high-precision length calculation, and adapt to compensation chains with different surface characteristics.

[0005] The known related technology application number is 202511301664.6, entitled "An Elevator Compensation Chain Length Measuring Device". This patent uses two sets of symmetrical stabilizing devices (polyurethane-coated rollers + belts) and corresponding clamping devices (cylinder driven, 125mm stroke, 0.1-0.2MPa constant pressure) to form upper and lower clamping, suppressing chain vibration. Adaptive adjustment devices (slide rails + rubber wheel clamping parts) are provided on both sides, which can be manually adjusted to adapt to different chain diameters. The positioning system consists of a push-out cylinder and an X / Z axis motor slide (42 stepper motors, positioning accuracy ≤0.5mm), used to adjust the eddy current sensor (φ18mm, range 7-20mm, repeatability 0.02mm) to the optimal measuring position. The system integrates two pull rod encoders (range 125mm, linearity 0.1%), which monitor the displacement of the clamping device and the distance between the clamping parts in real time, feeding back to the microcontroller to achieve closed-loop correction of the sensor's pose. During measurement, the sensor acquires the chain link contour signal, which is then used by Kalman filtering and peak detection algorithms to identify the number of chain links. The length is calculated using the formula L=N(l-2d)+2d. Throughout the process, the lever encoder continuously monitors the pose and dynamically adjusts the slide to ensure signal stability. This device achieves non-contact, high-precision, and multi-specification adaptive length measurement through passive following and dynamic spatial pose correction.

[0006] The aforementioned patents address the issue of online length measurement, but they have shortcomings in terms of easy replacement of the compensation chain, ease of operation for workers, and length measurement of thicker chains (such as those with thicker external rubber coating). For example, patent application number 201710789581.5 suffers from inherent length measurement inaccuracies due to the inability to avoid slippage during traction and belt wear caused by prolonged contact transmission. Patent application number 202410971502.2, where the entire length measuring device uses a contact mechanical structure and a three-axis slide to locate the sensor measuring point at the start of compensation chain length measurement, requires significant time for repeated determination of the detection position when multiple chain models are produced together, and chain replacement reduces length measurement efficiency. Patent application number 202511301664.6, when detecting a thicker rubber coating, finds that the eddy current sensor may fail to detect the signal from the iron ring in the chain due to the limited detection capability of the signal sensor, leading to inaccurate length measurement. Summary of the Invention

[0007] This application provides a multi-specification large-diameter elevator compensation chain length measuring device to solve the above-mentioned technical problems.

[0008] To solve the above-mentioned technical problems, one technical solution adopted in this application is: a multi-specification large-diameter elevator compensation chain length measuring device, comprising:

[0009] The clamping assembly includes a stabilizing assembly, a cylinder, and a pressing assembly; wherein, the stabilizing assembly, the cylinder, and the pressing assembly work together to clamp the elevator compensation chain;

[0010] The measuring component is located between the stabilizing component and the cylinder; the measuring component is used to collect the linear displacement signal of the elevator compensation chain to independently complete the length measurement of the all-plastic compensation chain.

[0011] The conversion module is connected to the measurement component; the conversion module includes a signal processing module and a data transmission module; the signal processing module analyzes the sensor signal and measures the length, and the data transmission module outputs the length measurement result.

[0012] Furthermore, the pressing component includes a workbench and an L-shaped bracket. The stabilizing component is located on the side of the workbench. A slotted tube for threading the elevator compensation chain is provided above the L-shaped bracket, and the pressing component is located above the slotted tube. A frame plate is provided on the opening at the upper end of the L-shaped bracket. The cylinder is fixed on the frame plate, and the telescopic rod at the lower end of the cylinder is connected to the slotted tube.

[0013] Furthermore, the measuring components include a laser sensor, a crank-slider assembly, an inclination adjustment assembly, and an encoder wheel assembly. The inclination adjustment assembly is connected to an L-shaped bracket via a connecting plate and is used to adjust the inclination angle so that the encoder wheel assembly makes cross-shaped contact with the elevator compensation chain. The crank-slider assembly converts the curved motion of the encoder wheel assembly caused by the undulation of the elevator compensation chain into linear displacement. The laser sensor is used to collect this linear displacement signal so that the encoder wheel assembly can independently complete the length measurement of the all-plastic compensation chain.

[0014] Furthermore, the inclination adjustment assembly includes an inclination plate and a base plate horizontally fixed to the connecting plate; a back plate is provided on the back of the inclination plate, and L-shaped connecting plates are fixed to both sides of the bottom of the back plate; a shaft plate is provided at the front end of the base plate, and the shaft plate is located between the L-shaped connecting plates and hinged to the L-shaped connecting plates.

[0015] Furthermore, a fixed stop is provided on one side of the base plate, and a screw hole block is provided on the other side of the base plate; a screw rod is inserted through the screw hole block, a guide pressing turntable is sleeved on one side of the screw rod, and the other side of the screw rod is connected to the fixed stop.

[0016] Furthermore, a connecting block is fixedly attached to the back plate, and a first rotating shaft is provided on both sides of the connecting block. The first rotating shaft is movably connected to the shaft hole at one end of the support arm, and the shaft holes at the other end of the support arm are connected by a through shaft, wherein the through shaft is connected to the middle of the screw.

[0017] Furthermore, the crank-slider assembly includes a sliding seat and a reflector fixed to the sliding seat; the inclined plate is provided with a plurality of grooves corresponding to the sliding seat, and the inner side of the sliding seat is provided with a sliding connecting block that is movably engaged in the groove; the laser sensor is disposed above the sliding seat and opposite to the reflector, and is used to detect the sliding position of the reflector.

[0018] Furthermore, a connecting rod is provided below the sliding seat, and a shaft is hinged below the connecting rod; a strip groove is provided in the inclined plate, which is parallel to the second cylinder, and a sliding column connected to the encoder wheel assembly is provided in the strip groove.

[0019] Furthermore, the coding wheel assembly includes a wheel plate movably connected to the sliding column and a coding wheel movably disposed at the lower end of the wheel plate. The wheel plate has a through hole; a second rotating shaft is provided in the through hole, and the second rotating shaft is movably connected to the shaft hole at the lower end of the shaft rod; a sleeve is provided in the sliding column on the back of the wheel plate, and a first connecting post is provided on the sleeve. The first connecting post is connected to the second connecting post on the back side of the wheel plate by a spring.

[0020] Furthermore, the stabilizing component includes a wall panel with a central slot corresponding to the groove tube, and conveyor belts for guiding the elevator compensation chain are symmetrically arranged at the upper and lower ends of the central slot.

[0021] Furthermore, the device also includes a dual-mode automatic switching control module; the dual-mode automatic switching control module is used to select the valley detection measurement mode or the encoder measurement mode according to the compensation chain type, and automatically clears the encoder count and valley count when switching measurement modes to eliminate the length accumulation error caused by the mode switching.

[0022] Furthermore, the valley detection measurement mode employs a combination of Kalman filtering and valley detection algorithms. The Kalman filtering algorithm is used to perform noise reduction and smoothing on the original contour signal acquired by the ADC, while the valley detection algorithm is used to identify the valleys of the filtered signal, thereby improving the link counting accuracy of the plastic-coated compensation chain.

[0023] Furthermore, the multi-specification large-diameter elevator compensation chain length measuring device is characterized in that the signal processing module pre-stores a chain link parameter library for multi-specification compensation chains, including the chain pitch P value and chain link diameter D value corresponding to different models; the device automatically calls up the corresponding parameters according to the selected product model and displays them back to the display terminal in real time, without the need for manual parameter input.

[0024] The beneficial effects of this application are as follows: By setting an inclination adjustment device, this application makes the encoder wheel and the plastic-coated chain make "+" shaped contact. After changing the chain specification, there is no need to readjust the position of the encoder wheel, which significantly shortens the changeover time, reduces operating costs, and improves the versatility and adaptability of the equipment. This application uses a crank-slider mechanism composed of a crank-slider assembly and an encoder wheel assembly to convert the complex curved surface motion of the encoder wheel into linear displacement. Combined with a common laser sensor, it can collect data on the surface undulations of the chain, avoiding the use of high-precision displacement sensors and greatly reducing the hardware cost of the length measurement system. The contact length measurement has no slippage logic. When measuring the length of the all-plastic chain, the encoder wheel is coated with an adhesive material to increase surface friction. At the same time, the spring and screw provide bidirectional preload, so that the encoder wheel is always in close contact with the chain surface, eliminating relative slippage structurally and avoiding the cumulative error of contact measurement. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the multi-specification large-diameter elevator compensation chain length measuring device of this application;

[0026] Figure 2 yes Figure 1 A schematic diagram of the structure of one embodiment of the pressing component;

[0027] Figure 3 yes Figure 1 A schematic diagram of the structure of an embodiment of the slope adjustment component;

[0028] Figure 4 yes Figure 1 A schematic diagram of the structure of an embodiment of the coding wheel component.

[0029] Figure 5 yes Figure 1 A schematic diagram of the structure of one embodiment of the stabilizing component. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments.

[0031] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0032] See Figure 1 , Figure 1This is a schematic diagram of an embodiment of the multi-specification large-diameter elevator compensation chain length measuring device of this application. The method includes: a clamping component, a measuring component, and a conversion module; the clamping component includes a stabilizing component 1, a cylinder 2, and a pressing component 3; wherein, the stabilizing component 1, cylinder 2, and pressing component 3 cooperate to clamp the elevator compensation chain; the measuring component is located between the stabilizing component 1 and cylinder 2; wherein, the measuring component is used to collect the linear displacement signal of the elevator compensation chain to independently complete the length measurement of the all-plastic compensation chain; the conversion module is connected to the measuring component; the conversion module includes a signal processing module and a data transmission module; wherein, the signal processing module analyzes the sensor signal and calculates the length, and the data transmission module outputs the length measurement result. In the above design, the complex curved surface motion of the encoder wheel is converted into linear displacement, and with the help of a common laser sensor, the surface undulation data of the chain can be collected, avoiding the use of a high-precision displacement sensor and significantly reducing the hardware cost of the length measuring system.

[0033] See Figure 2 The pressing component 3 includes a workbench 31 and an L-shaped bracket 32. The stabilizing component 1 is located on the side of the workbench 31. A slotted tube 33 for threading the elevator compensation chain is provided above the L-shaped bracket 32, and the pressing component 3 is located above the slotted tube 33. A frame plate 34 is provided on the opening at the upper end of the L-shaped bracket 32. The cylinder 2 is fixed on the frame plate 34, and the telescopic rod at the lower end of the cylinder 2 is connected to the slotted tube 33. The above design presses the compensation chain against the reference surface of the stabilizing component 1, suppressing the longitudinal jump and lateral swing of the compensation chain, and providing a stable physical basis for length measurement. The pressing force of the cylinder 2 can be adjusted by air pressure to adapt to the pressing requirements of chains of different specifications. The workbench 31 and the L-shaped bracket 32 ​​are integrally cast, possessing high rigidity and vibration resistance, improving the long-term stability of the device.

[0034] The measuring components include a laser sensor 4, a crank-slider assembly 5, an inclination adjustment assembly 6, and an encoder wheel assembly 7. The inclination adjustment assembly 6 is connected to an L-shaped bracket 32 ​​via a connecting plate and is used to adjust the inclination angle so that the encoder wheel assembly 7 makes a cross-shaped contact with the elevator compensation chain. The crank-slider assembly 5 converts the curved motion of the encoder wheel assembly 7 into linear displacement. The laser sensor 4 is used to collect this linear displacement signal, enabling the encoder wheel assembly 7 to independently complete the length measurement of the all-plastic compensation chain. The inclination adjustment device in the above design ensures that the encoder wheel and the plastic-coated chain make a cross-shaped contact, eliminating the need to readjust the encoder wheel position after changing the chain specifications, significantly shortening changeover time and reducing operating costs.

[0035] See Figure 3The inclination adjustment assembly 6 includes an inclined plate 61 and a base plate 62 horizontally fixed to a connecting plate. A back plate 63 is provided on the back of the inclined plate 61, and L-shaped connecting plates 64 are fixed to both sides of the bottom of the back plate 63. A shaft plate 621 is provided at the front end of the base plate 62, and the shaft plate 621 is located between and hinged to the L-shaped connecting plates 64. In this design, the inclined plate 61 is movably connected to the base plate 62 via the L-shaped connecting plates 64, thereby allowing the inclination angle of the inclined plate 61 to be adjusted.

[0036] A fixed stop 65 is provided on one side of the base plate 62, and a screw hole block 66 is provided on the other side of the base plate 62; a screw 67 passes through the screw hole block 66, and a guide pressing turntable 68 is sleeved on one side of the screw 67, while the other side of the screw 67 is connected to the fixed stop 65. In the above design, the guide pressing turntable 68 can rotate to the screw 67 to adjust the tilt angle of the inclined plate.

[0037] A connecting block 631 is fixedly attached to the back plate 63. First rotating shafts 632 are provided on both sides of the connecting block 631. The first rotating shafts 632 are movably connected to the shaft holes at one end of the support arm 69. The shaft holes at the other end of the support arm 69 are connected by a through shaft 691, which is connected to the middle of the screw 67. In the above design, the support arm 69 is used to support the inclined plate 61. For the all-plastic compensation chain, the surface of the through shaft 691 is provided with threads for engagement with the screw 67. Rotation of the screw 67 can adjust the fulcrum position of the support arm 69, thereby controlling the angle of the inclined plate 61.

[0038] The crank-slider assembly 5 includes a sliding seat 51 and a reflector 56 fixed to the sliding seat 51. The inclined plate 61 has multiple grooves 611 corresponding to the sliding seat 51, and the inner side of the sliding seat 51 has a sliding connecting block 52 that is movably engaged in the grooves 611. A laser sensor 4 is positioned above the sliding seat 51 and slidably mounted with the reflector 56 to detect the sliding position of the reflector 56. In this design, the sliding seat 51 can move back and forth along the grooves 611, while the laser sensor 4 emits a laser beam towards the reflective surface of the sliding seat 51. Based on the laser ranging principle, it collects the position change data of the slider in real time, thereby obtaining the original waveform signal reflecting the undulations of the chain surface contour. After sampling by the microcontroller, the original waveform signal is processed by a Kalman filter algorithm to eliminate noise and vibration interference, and then a trough detection algorithm is used to identify the number of troughs (each trough corresponds to a chain link). Combined with preset pitch parameters, the total length is calculated, achieving non-contact high-precision measurement.

[0039] A connecting rod 53 is provided below the sliding seat 51, and a shaft 54 ​​is hinged below the connecting rod 53; a strip groove 612 is provided in the inclined plate 61, which is parallel to the second cylinder 2, and a sliding post 55 connected to the encoder wheel assembly 7 is provided in the strip groove 612. In the above design, the sliding post 55 can move back and forth along the strip groove 612, thereby facilitating the adjustment of its position according to the undulation of the encoder wheel assembly 7.

[0040] See Figure 4 The encoder wheel assembly 7 includes a wheel plate 71 movably connected to a sliding post 55 and an encoder wheel 72 movably disposed at the lower end of the wheel plate 71. The wheel plate 71 has a through hole 711; a second rotating shaft 712 is disposed in the through hole 711 and movably connected to a shaft hole at the lower end of a shaft rod 54. A sleeve 73 is disposed on the back of the wheel plate 71 within the sliding post 55, and a first connecting post 74 is disposed on the sleeve 73. The first connecting post 74 is connected to the second connecting post 75 on the back side of the wheel plate 71 by a spring 76. In the above design, the encoder wheel 72 is tilted by the inclined plate 61, allowing the tilt angle of the measuring unit relative to the horizontal plane to be adjustable. This tilts the axis of the encoder wheel 72 with the chain running direction, resulting in a cross-shaped contact line, replacing the traditional vertical "X-shaped" projection contact. This eliminates the need to adjust the position of the encoder wheel 72 when using different chain specifications, improving versatility and ease of operation. The spring 76 has a telescopic stroke of 0-50mm, which is compatible with various specifications of plastic-coated compensation chains with a maximum radius of no more than 50mm, ensuring that the chain is always in the reference measurement position when the chain model changes.

[0041] See Figure 5 The stabilizing component 1 includes a wall panel 11, in which a central slot 12 corresponding to the slotted tube 33 is provided. Conveyor belts 13 for guiding the elevator compensation chain are symmetrically arranged at the upper and lower ends of the central slot 12. In the above design, the central slot 12 guides the elevator compensation chain so that it can smoothly enter the encoder wheel 72 and the clamping component.

[0042] This device employs intelligent switching control with dual measurement modes, automatically resetting the counter during switching to avoid accumulated errors. The trough detection mode uses a Kalman filter algorithm to reduce noise in the original signal, and then identifies the chain links through the trough detection algorithm, significantly improving the measurement stability of the plastic-coated compensation chain in industrial vibration and oily environments. The device has a built-in parameter library for multiple specifications of compensation chains, which can automatically match the chain link parameters according to the product model. It also enables real-time interaction with the touch screen via the Modbus communication protocol to display the measured length, set length, working mode, and running status. In addition, it has an automatic stop and reset function when the preset length is reached, realizing fully automatic closed-loop length measurement control.

[0043] The valley detection measurement mode uses a combination of Kalman filtering algorithm and valley detection algorithm for processing; the Kalman filtering algorithm is used to perform noise reduction and smoothing processing on the original contour signal acquired by ADC, and the valley detection algorithm is used to identify the valleys of the filtered signal, thereby improving the link counting accuracy of the plastic-coated compensation chain.

[0044] The signal processing module has a pre-stored library of link parameters for compensation chains of various specifications, including the link pitch P value and link diameter D value corresponding to different models. The device of this application automatically calls up the corresponding parameters according to the selected product model and displays them back to the display terminal in real time, without the need for manual input of parameters.

[0045] During actual measurement, when the elevator compensation chain passes through the measurement area, the clamping devices on both sides press down, and the elevator compensation chain passes through the compensation chain measurement area at a stable and uniform speed. When measuring the all-plastic compensation chain, the encoder wheel 72 is wrapped with adhesive material and directly contacts the surface of the all-plastic compensation chain. Based on the pulse counting method of the encoder wheel 72, the measured length = number of rotations of the encoder wheel 72 × wheel circumference. Assuming the encoder resolution is PPR (pulses per revolution), the frequency multiplication factor is K (1 / 2 / 4), and the counter reading is N, then:

[0046] ;

[0047] When measuring the plastic-coated compensation chain, due to the self-adaptive nature of the screw 67 and the use of the slant adjustment device, the compensation chain system does not require additional adjustments; only the chain type needs to be changed for measurement. The encoder wheel 72, through the screw 67, is brought as close as possible to the surface of the plastic-coated compensation chain, transforming the complex unevenness of the chain surface into simple linear motion via a crank-slider mechanism. Finally, the laser sensor 4 measures the range of this linear motion, mapping the number of chain links of the plastic-coated compensation chain. Let the total length of the compensation chain be L, the length of a single chain link be l, the straight side diameter be d, and the pitch be p, where l = p + 2d. The derived formula is shown below:

[0048] ; ;

[0049] When the detected length reaches the set value, the length measuring system sends a stop signal to the control terminal to terminate the movement of the compensation chain. The compensation chain stops and waits to be cut. The length measuring system waits for the terminal signal to continue the next measurement.

[0050] Example 1: Implementation Process of Length Measurement of Plastic-Coated Compensating Chain

[0051] Preliminary preparation: According to the specifications of the plastic-coated compensation chain to be measured (radius ≤ 50mm), adjust the air pressure of cylinder 2 and set a suitable clamping force; there is no need to adjust the position of encoder wheel 72, the inclined plate 61 in the inclination adjustment component 6 has a preset tilt angle, so that encoder wheel 72 and chain make cross-shaped contact;

[0052] Chain clamping: The plastic-coated compensation chain is passed through the measuring area, and the cylinder 2 drives the pressing component 3 to press down, pressing the chain against the reference surface of the groove tube 33, suppressing chain jumping and swinging, and ensuring that the chain runs at a constant speed along the reference direction;

[0053] Length measurement start: The encoder wheel 72 moves up and down with the plastic-coated chain, and its curved surface motion is converted into the linear reciprocating motion of the sliding seat 51 through the crank-slider mechanism; the laser sensor 4 emits a laser at the reflective surface of the sliding seat 51, and collects the slider position change data in real time to obtain the original waveform signal of the chain surface contour.

[0054] Signal processing: The raw signal is transmitted to the signal processing module. After sampling by the microcontroller, random noise and vibration interference are eliminated by the Kalman filter algorithm to obtain a smooth waveform curve. Then, the number of troughs in the waveform is identified by the trough detection algorithm. Each trough corresponds to a link, and the number of troughs is mapped to the number of links.

[0055] Length calculation and output: Based on the preset plastic-coated compensation chain pitch parameters, the total chain length is calculated, and the data transmission module transmits the length measurement result to the external control terminal through the GPIO interface;

[0056] Cutting control: When the detected length reaches the set value, the length measuring system sends a stop signal to the control terminal to terminate the movement of the compensation chain. The chain stops and waits for manual / automatic cutting. After cutting is completed, the length measuring system waits for the terminal signal to start the next measurement.

[0057] Example 2: Implementation Process of Length Measurement of All-Plastic Compensation Chain

[0058] Preliminary preparation: According to the specifications of the all-plastic compensation chain to be measured, adjust the air pressure of cylinder 2 to set the clamping force; screw 67 adaptively applies preload to encoder wheel 72 to ensure that encoder wheel 72 is tightly attached to the surface of all-plastic chain;

[0059] Chain clamping: Pass the all-plastic compensation chain through the measuring area, and the cylinder 2 drives the pressing component 3 to press down, pressing the chain against the reference surface of the groove tube 33 to ensure that the chain runs at a uniform speed;

[0060] Length measurement start: Switch to all-plastic chain length measurement mode, only the encoder wheel 72 device is activated; the encoder wheel 72 is covered with adhesive material, and there is no slippage contact with the surface of the all-plastic chain. It rotates synchronously with the chain movement, and the encoder wheel 72 sensor collects pulse signals;

[0061] Length Calculation and Output: The signal processing module calculates the length using the pulse counting method. The calculation formula is: L=PPR×KN×ΠD (where the encoder resolution PPR is 1000, the frequency multiplication factor K is 4, and the diameter D of the encoder wheel 72 is 50mm); the data transmission module transmits the length measurement result to the external control terminal.

[0062] Cutting control: When the detected length reaches the set value, the length measuring system sends a stop signal to terminate the movement of the compensation chain and wait for cutting. After completion, it waits for the terminal signal to start the next measurement.

[0063] In this embodiment, multiple length measurement tests were conducted on plastic-coated and all-plastic compensation chains of different specifications. The results showed that the relative measurement error was within 5‰, the changeover time was shortened from 10-15 minutes of the existing device to within 1 minute, there was no slippage phenomenon in the measurement of the all-plastic compensation chain, and there was no contour signal interference in the measurement of the plastic-coated compensation chain, which fully meets the production needs of large-scale and high-frequency changeover in factories.

[0064] This application uses an inclination adjustment device to make the encoder wheel 72 and the compensation chain make cross-shaped contact. After changing the chain with different specifications and pitches, there is no need to readjust the installation position of the encoder wheel 72, which greatly shortens the changeover time, reduces operating costs, and is compatible with multi-specification plastic-coated compensation chains with a maximum radius of 50mm. It solves the problems of complex positioning and easy sensor contact in existing devices.

[0065] This application utilizes the crank-slider assembly 5 to convert the complex curved surface motion of the encoder wheel 72 into linear displacement. Combined with a common laser sensor 4, it can collect data on the undulations of the chain surface, avoiding the use of high-precision displacement sensors and laser sensors 4 in the prior art, thus significantly reducing hardware costs. At the same time, the Kalman filter algorithm effectively eliminates noise interference, the valley detection algorithm accurately identifies the number of chain links, and the non-contact measurement avoids the accuracy loss caused by friction, significantly improving measurement stability.

[0066] This application is compatible with multiple types of compensation chains and has a high degree of integration: one device integrates two length measurement modules, one plastic-coated and one all-plastic, and can achieve accurate length measurement of different types of compensation chains through simple mode switching. It has a compact structure and is easy to operate, solving the problem of single-type adaptation of existing devices; for all-plastic compensation chains, the encoder wheel 72 is coated with adhesive material + screw 67 is designed with pre-tightening force to effectively suppress slippage and solve the problem of slippage accumulation error in existing contact measurement.

[0067] This application boasts strong environmental adaptability and is well-suited for factory production: it eliminates the need for environmentally sensitive components such as high-precision laser sensors 4 and eddy current sensors. The core sensors are a standard laser sensor 4 and an encoder wheel 72 sensor, offering strong resistance to oil contamination and vibration. Furthermore, the clamping device effectively suppresses chain slippage, making it suitable for complex factory production environments and addressing the issue of high environmental requirements in existing non-contact measurement methods. It also features a stable structure and convenient operation: the cast iron bracket is integrally cast, enhancing the device's vibration resistance and long-term stability. The clamping force of cylinder 2 can be flexibly adjusted via air pressure to accommodate chains of different specifications. The measurement results are automatically transmitted to an external terminal, and a stop signal is automatically sent upon reaching the set length, achieving automated length measurement and reducing manual operation intensity.

[0068] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A multi-specification large-diameter elevator compensation chain length measuring device, characterized in that, include: The clamping assembly includes a stabilizing component, a cylinder, and a pressing component; wherein the stabilizing component, the cylinder, and the pressing component work together to clamp the elevator compensation chain. A measuring component is located between the stabilizing component and the cylinder; wherein, the measuring component is used to acquire the linear displacement signal of the elevator compensation chain to independently complete the length measurement of the all-plastic compensation chain; A conversion module is connected to the measurement component; the conversion module includes a signal processing module and a data transmission module; wherein, the signal processing module analyzes the sensor signal and calculates the length, and the data transmission module outputs the length measurement result to the outside.

2. The multi-specification large-diameter elevator compensation chain length measuring device according to claim 1, characterized in that, The pressing component includes a workbench and an L-shaped bracket. The stabilizing component is located at the side of the workbench. A slotted tube for threading the elevator compensation chain is provided above the L-shaped bracket. The pressing component is located above the slotted tube. A frame plate is provided on the opening at the upper end of the L-shaped bracket. The cylinder is fixed on the frame plate, and the telescopic rod at the lower end of the cylinder is connected to the slotted tube.

3. The multi-specification large-diameter elevator compensation chain length measuring device according to claim 2, characterized in that, The measuring assembly includes a laser sensor, a crank-slider assembly, an inclination adjustment assembly, and an encoder wheel assembly. The inclination adjustment assembly is connected to the L-shaped bracket via a connecting plate and is used to adjust the inclination angle so that the encoder wheel assembly makes cross-shaped contact with the elevator compensation chain. The crank-slider assembly converts the curved motion of the encoder wheel assembly caused by the undulations of the elevator compensation chain into linear displacement. The laser sensor is used to collect this linear displacement signal, enabling the encoder wheel assembly to independently complete the length measurement of the all-plastic compensation chain.

4. The multi-specification large-diameter elevator compensation chain length measuring device according to claim 3, characterized in that, The inclination adjustment assembly includes an inclined plate and a base plate horizontally fixed to the connecting plate; the back of the inclined plate is provided with a back plate, and L-shaped connecting plates are fixed to both sides of the bottom of the back plate; the front end of the base plate is provided with a shaft plate, which is located between the L-shaped connecting plates and hinged to the L-shaped connecting plates.

5. The multi-specification large-diameter elevator compensation chain length measuring device according to claim 4, characterized in that, A fixed stop is provided on one side of the base plate, and a screw hole block is provided on the other side of the base plate; a screw rod is inserted through the screw hole block, a guide pressing turntable is sleeved on one side of the screw rod, and the other side of the screw rod is connected to the fixed stop.

6. The multi-specification large-diameter elevator compensation chain length measuring device according to claim 5, characterized in that, A connecting block is fixedly attached to the back plate. A first rotating shaft is provided on both sides of the connecting block. The first rotating shaft is movably connected to the shaft hole at one end of the support arm. The shaft holes at the other end of the support arm are connected by a through shaft. The through shaft is connected to the middle part of the screw.

7. A multi-specification large-diameter elevator compensation chain length measuring device according to claim 4, characterized in that, The crank-slider assembly includes a sliding seat and a reflector plate fixed to the sliding seat; the inclined plate is provided with a plurality of sliding grooves corresponding to the sliding seat, and the inner side of the sliding seat is provided with a sliding connecting block that is movably engaged in the sliding groove; the laser sensor is disposed above the sliding seat and opposite to the reflector plate, and is used to detect the sliding position of the reflector plate.

8. A multi-specification large-diameter elevator compensation chain length measuring device according to claim 7, characterized in that, A connecting rod is provided below the sliding seat, and a shaft is hinged below the connecting rod; a strip groove is provided in the inclined plate, which is parallel to the second cylinder, and a sliding column connected to the coding wheel assembly is provided in the strip groove.

9. A multi-specification large-diameter elevator compensation chain length measuring device according to claim 8, characterized in that, The encoding wheel assembly includes a wheel plate movably connected to the front end of the sliding column and an encoding wheel movably disposed at the lower end of the wheel plate. The wheel plate has a through hole; a second rotating shaft is provided in the through hole, and the second rotating shaft is movably connected to the shaft hole at the lower end of the shaft rod; a sleeve is provided in the sliding column on the back of the wheel plate, and a first connecting post is provided on the sleeve. The first connecting post is connected to a second connecting post on the back side of the wheel plate by a spring.

10. A multi-specification large-diameter elevator compensation chain length measuring device according to claim 2, characterized in that, The stabilizing component includes a wall panel with a central slot corresponding to the groove tube. Conveyor belts for guiding the elevator compensation chain are symmetrically arranged at the upper and lower ends of the central slot.

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