An on-line length measuring device in a cable production process

Abstract

The utility model discloses an online length measuring device in cable production process relates to cable production detection equipment technical field, including mounting bracket, compression wheel, guide wheel, measuring wheel and detection device, the compression wheel horizontal interval rotation is installed on the mounting bracket, and the guide wheel and measuring wheel rotation are installed on the mounting bracket, and the compression wheel is formed with the guide wheel, measuring wheel between the clamping gap for the cable of passing through to be measured, and the gap is less than the cable diameter to be measured, measuring wheel is fixedly connected with the pivot of detection device, and the cable to be measured moves through friction force and drives the rotation of measuring wheel, and detection device converts the rotation of measuring wheel into length data, the mounting bracket still is equipped with the calibration device including static generator, fiber sensor no.

Description

Technical Field

[0001] This utility model relates to the technical field of cable production and testing equipment, specifically to an online length measuring device in the cable production process. Background Technology

[0002] On cable production lines, to achieve on-demand cutting, pricing and sales, and quality control, real-time and accurate length measurement of the produced cables is required. Currently, the mainstream online measurement method is contact measurement, which uses one or more measuring wheels (commonly known as "meter wheels") pressed against the moving cable surface. As the cable moves on the production line, friction drives the measuring wheels to roll. The rotation of the measuring wheels then drives a mechanical counter through gears or other mechanical transmission mechanisms. Finally, production personnel determine the cutting length by observing the counter reading. This traditional contact measurement device has the following inherent drawbacks:

[0003] 1. Mechanical counters have limited accuracy and rely on mechanical transmission. Wear and gaps further reduce their accuracy. More importantly, their output is a mechanical reading and cannot generate an electrical signal. Therefore, they are difficult to link with the main control system of the production line, such as a PLC (Programmable Logic Controller), and cannot realize automated functions such as automatic marking, automatic alarm, or automatic cutting after the length is reached.

[0004] 2. The measuring wheel, constantly rubbing against the high-speed moving cable, inevitably experiences wear on its surface (usually a rubber or polyurethane layer), causing its effective circumference to gradually decrease. Over time, this wear creates an increasingly large cumulative negative error, meaning the measured value is less than the actual value, affecting the accuracy of product measurement. Furthermore, to address the error caused by wear, the production line must be periodically shut down for manual recalibration, impacting the continuity and overall efficiency of the production line. Utility Model Content

[0005] To overcome the problems in the prior art, this utility model provides an online length measuring device for cable production, which has high measurement accuracy and online automatic calibration function.

[0006] An online length measuring device for cable production includes a mounting frame, pressure rollers, guide rollers, measuring rollers, and a detection device. The pressure rollers are horizontally and rotatably mounted on the mounting frame at intervals. Each guide roller has a corresponding guide roller installed below it, and one of the guide rollers is a measuring roller. The guide rollers are rotatably mounted to the mounting frame. The measuring rollers are fixedly mounted to one end of the rotating shaft of the detection device, and the other end of the rotating shaft is connected to the rotor of the detection device. The distance between the pressure rollers, guide rollers, and measuring rollers is the same and smaller than the diameter of the cable to be measured. The cable to be measured drives the rollers to rotate through the friction between the cable and the pressure rollers and guide rollers.

[0007] Furthermore, the detection device is a photoelectric rotary encoder, with the measuring wheel fixed to one end of the photoelectric rotary encoder's main shaft and the rotor of the photoelectric rotary encoder fixed to the other end of the main shaft. The housing of the photoelectric rotary encoder is fixed to the mounting bracket.

[0008] Furthermore, a calibration device is also installed on the mounting bracket.

[0009] Furthermore, the calibration device includes an electrostatic generator and fiber optic sensor one and fiber optic sensor two. The electrostatic generator is fixed to a mounting bracket in the direction of the input path of the cable under test. The nozzle of the electrostatic generator is aligned with the cable under test. Fiber optic sensor one and fiber optic sensor two are horizontally spaced apart. Fiber optic sensor one and fiber optic sensor two are fixed to the mounting bracket in the direction of the input path of the cable under test, and the sensor detection ends are aligned with the electrostatic generator marking area of ​​the cable under test.

[0010] Furthermore, the detection device includes a PLC controller and a digital display screen. A photoelectric rotary encoder, an electrostatic generator, and fiber optic sensor one and fiber optic sensor two are connected to the PLC controller, which is connected to the digital display screen.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. By replacing the traditional mechanical counter with a photoelectric rotary encoder, high-resolution digital pulse signals can be output, resulting in an order-of-magnitude improvement in measurement accuracy. At the same time, the digital signals can be easily connected to the PLC controller, providing a foundation for automated control (such as fixed-length cutting).

[0013] 2. The calibration device can automatically detect and output signals to the photoelectric rotary encoder without stopping the machine to compensate for errors caused by wear of the measuring wheel, ensuring the accuracy of length measurement during long-term production.

[0014] 3. Online calibration reduces the time and manpower wasted on manual downtime calibration, thus improving the overall operating efficiency of the production line. Attached Figure Description

[0015] To clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments are explained.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a front view structural diagram of the present utility model;

[0018] Figure 3 This is a top view of the structure of this utility model;

[0019] Figure 4 This is a side view of the structure of this utility model.

[0020] Reference numerals in the attached drawings: 1-mounting bracket, 2-pressure roller, 3-guide roller, 4-measuring roller, 5-detection device, 6-cable under test, 61-static generator, 611-nozzle, 62-fiber optic sensor one, 63-fiber optic sensor two. Detailed Implementation

[0021] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0022] See Figure 1-4 This utility model proposes an online length measuring device in the cable production process, including a mounting frame 1 with a main measuring mechanism and a calibration device. The main measuring mechanism is used to measure the length of the cable 6 passing through it, and includes several upper pressure rollers 2, lower guide rollers 3, and measuring rollers 4. The cable 6 to be tested is clamped between the upper and lower roller groups, and the roller groups are driven to rotate by friction. The measuring rollers 4 are fixedly connected to the rotating shaft of the detection device 5. In this embodiment, the detection device 5 is a photoelectric rotary encoder, which can accurately convert the mechanical rotation of the measuring rollers 4 into electrical pulse signals. The measuring rollers 4 are directly fixed to one end of the encoder spindle, ensuring 1:1 synchronous rotation between the two without transmission error.

[0023] Electrical connection: The signal output terminal of the detection device 5, i.e. the photoelectric rotary encoder, is connected to the PLC controller. The PLC controller counts and calculates the received pulses and sends the calculated length value to the digital display screen for real-time display.

[0024] To overcome the wear problem of the measuring wheel 4, this device is also equipped with a calibration device, including an electrostatic generator 61 and a pair of fiber optic sensors, namely fiber optic sensor one 62 and fiber optic sensor two 63. The electrostatic generator 61 is located at the cable inlet, and its nozzle 611 is aligned with the cable 6 to be tested. Fiber optic sensor one 62 and fiber optic sensor two 63 are fixedly installed horizontally at intervals along the cable path, and the distance L between them is precisely known. The signal terminals of the electrostatic generator 61, fiber optic sensor one 62 and fiber optic sensor two 63 are all connected to the PLC controller.

[0025] Work process:

[0026] Routine measurement: During the production process, the cable under test 6 drives the measuring wheel 4 to rotate. The detection device 5, i.e., the photoelectric rotary encoder, converts the rotation angle into a pulse signal and sends it to the PLC controller. The PLC controller calculates the cable length based on the initially set circumference of the measuring wheel 4 and the number of pulses, and displays it on the digital display screen.

[0027] Automatic calibration: The PLC controller starts calibration once every 1000 meters of cable produced according to the preset program. First, the PLC controller instructs the nozzle 611 of the electrostatic generator 61 to spray a tiny optical mark on the surface of the cable (6). When the mark passes the fiber optic sensor 62, the PLC controller starts the internal high-speed timer. When the mark continues to move and passes the fiber optic sensor 63, the timer stops. The PLC controller calculates the actual speed V of the cable based on the fixed distance L and the measured time T. The PLC controller compares this actual speed V with the speed fed back by the detection device 5. If there is a deviation, a new correction coefficient is calculated and the length calculation formula is updated with this coefficient, thereby completing the compensation for the wear of the measuring wheel 4.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An online length measuring device for cable production, characterized in that, The device includes a mounting frame (1), a pressure roller (2), a guide roller (3), a measuring roller (4), and a detection device (5). The pressure roller (2) is horizontally and rotatably mounted on the mounting frame (1). Each guide roller (3) is equipped with a corresponding guide roller (3), and one of the guide rollers (3) is a measuring roller (4). The guide roller (3) is rotatably mounted on the mounting frame (1). The measuring roller (4) is fixedly mounted on one end of the rotating shaft of the detection device (5), and the other end of the rotating shaft is connected to the rotor of the detection device (5). The distance between the pressure roller (2), the guide roller (3), and the measuring roller (4) is the same and smaller than the diameter of the cable (6) to be tested. The cable (6) to be tested drives the roller to rotate through the friction between the cable (6) and the pressure roller (2) and the guide roller (3).

2. The online length measuring device in the cable production process according to claim 1, characterized in that, The detection device (5) is a photoelectric rotary encoder. The measuring wheel (4) is fixed at one end of the main shaft of the photoelectric rotary encoder, the rotor of the photoelectric rotary encoder is fixed at the other end of the main shaft, and the outer shell of the photoelectric rotary encoder is fixed to the mounting bracket (1).

3. The online length measuring device in the cable production process according to claim 1, characterized in that, A calibration device is also installed on the mounting bracket (1).

4. The online length measuring device in the cable production process according to claim 3, characterized in that, The calibration device includes an electrostatic generator (61) and fiber optic sensor one (62) and fiber optic sensor two (63). The electrostatic generator (61) is fixed to the mounting bracket (1) in the input path direction of the cable under test (6). The nozzle (611) of the electrostatic generator (61) is aligned with the cable under test (6). The fiber optic sensor one (62) and fiber optic sensor two (63) are horizontally spaced apart. The fiber optic sensor one (62) and fiber optic sensor two (63) are fixed to the mounting bracket (1) in the input path direction of the cable under test (6) and the sensor detection end is aligned with the marking area of ​​the electrostatic generator (61) of the cable under test (6).

5. The online length measuring device in the cable production process according to claim 1, characterized in that, The detection device (5) includes a PLC controller and a digital display screen. The photoelectric rotary encoder, the electrostatic generator (61), and the fiber optic sensor one (62) and the fiber optic sensor two (63) are connected to the PLC controller. The PLC controller is connected to the digital display screen.

Images