A kind of wire cable insulation foil thickness measuring device and method based on pulse laser shielding counting

Abstract

This invention provides a device and method for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting. The device includes a measuring platform, a support assembly, a placement base, and a laser assembly. Compared with the prior art, this invention has the following advantages: By placing the wire and cable insulation sheet on a pulsed laser emitter and a photodiode receiver, a precision uniform speed moving platform drives a moving plate to move linearly and uniformly, so that the emitted laser is blocked when the insulation sheet passes by. The number of laser pulses blocked by the insulation sheet can be used to determine the insulation thickness of the wire and cable by calculating the radius of the insulation sheet using a formula. This measurement method reduces the reliance on manual operation and the influence of human subjective judgment. The support assembly has a detachable structure; installation only requires downward force, and disassembly only requires connecting the electromagnetic coil circuit and then pulling upward, achieving convenient assembly and disassembly.

Description

Technical Field

[0001] This invention belongs to the field of wire and cable insulation thickness measurement technology, and specifically relates to a device and method for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting. Background Technology

[0002] According to GB / T 2951.11-2008 "General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 11: General Test Methods - Measurement of Thickness and Dimensions - Mechanical Properties Tests", sections 8.1 Insulation Thickness Measurement and 8.2 Non-metallic Sheath Thickness Measurement mention two types of measuring equipment: a reading microscope or a projector with a magnification of at least 10x. However, these measuring devices have the following shortcomings: 1. It is highly dependent on manual operation, with large subjective errors and poor repeatability.

[0003] Subjective error of reading microscope: This method requires manual aiming of the eyepiece at the upper and lower edges of the insulating sheet and relying on the naked eye to judge whether the micrometer scale coincides with the edge. Due to the differences in visual resolution, focusing habits and reading angles of different operators, the measurement results of the same sample have large dispersion. Imaging alignment error of the projector: The projector projects the insulating sheet onto the scale screen using an optical system. The sample position needs to be manually adjusted to align the image edge with the scale line on the screen. Due to the influence of lens aberrations (such as distortion and chromatic aberration), the projected image of the edge of the insulating sheet may be "blurred" or "offset". The judgment deviation during manual alignment will directly cause measurement error, and the repeatability of multiple measurements by the same person is also difficult to guarantee.

[0004] 2. The imaging and measurement range is limited.

[0005] Limitations in field of view and material compatibility: The field of view of a reading microscope is relatively narrow, requiring repeated movement of the sample to find the measurement point. For small insulating sheets, positioning is difficult. Projectors require high light transmittance from the sample. For dark, highly reflective, or rough-surfaced insulating materials (such as black rubber insulating sheets), the projected image is blurry, making it impossible to clearly identify the edges, thus making measurement impossible. Both of these methods are difficult to measure insulating sheets with uneven thickness or coatings, and the transition area at the edge can interfere with the reading interpretation.

[0006] In conclusion, there is an urgent need to propose a new structure to solve the aforementioned technical problems. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a device and method for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting, thereby solving the problems mentioned in the background art.

[0008] This invention is achieved through the following technical solution: a device and method for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting, comprising: a measuring device platform, a support assembly, a placement seat, and a laser assembly, characterized in that the measuring device platform comprises a measuring platform body, a precision uniform speed moving platform, a moving plate, a crossbar, a photodiode receiver, and a gantry frame; The precision uniform speed moving platform is fixedly installed above the measuring table body. The precision uniform speed moving platform is a precision screw drive structure. The moving plate is movably installed above the precision uniform speed moving platform. The gantry is fixedly installed above the measuring table body. The cross frame is installed above the measuring table body and is fixedly connected to the gantry in the front-back direction. The laser assembly is installed inside the gantry frame and fixed by bolts. The laser assembly includes a pulsed laser emitter. The support assembly is located above the movable plate. The placement seat is located above the support assembly. The support assembly includes a support plate. The placement base includes a placement base body. Both the support plate and the placement base body are made of high-transparency quartz glass. The measuring platform body is equipped with a counting control module for synchronously acquiring the laser emission frequency, receiver signal shielding status, and platform movement status, and for real-time counting of the number of laser pulses shielded by the insulating sheet. It also has a data processing module for receiving the shielding count, laser emission frequency, and platform movement speed data transmitted by the counting control module. The counting control module is electrically connected to the pulsed laser emitter, photodiode receiver, and precision uniform speed moving platform.

[0009] In a preferred embodiment, the pulsed laser emitter is preferably a pulsed DFB frequency-stabilized visible light laser emitter. The photodiode receiver is provided with a narrowband filter on the light-incident side that matches the wavelength of the pulsed laser emitter. The precision uniform speed moving platform is provided with a position encoder. The counting control module establishes a synchronous sampling gate with the trigger signal of the pulsed laser emitter and compares the pulse amplitude of the photodiode receiver with the unobstructed baseline threshold. The condition for the start or end of shading is that at least three consecutive sampling pulses are in the same state. The support assembly also includes a support base, leveling studs, a negative pressure conduit, a bellows, an air pipe connector, and a rotating seat. The three leveling studs are threaded and screwed into the inside of the support base. The three leveling studs are evenly distributed around the circumference. The rotating seat is a rotating connection structure located above the leveling studs. The upper end of the rotating seat is also hinged to the support plate. The negative pressure conduit is located inside the support plate. The corrugated pipe is located at the end of the negative pressure conduit near the support plate. The tracheal connector is located above the corrugated pipe, and the other end of the negative pressure conduit is connected to an external negative pressure device, so that the external negative pressure device generates negative pressure suction and guides it through the negative pressure conduit. The corrugated pipe is a metal corrugated pipe, which is extended during the connection of the tracheal connector and compressed after the connection is completed. The placement base also includes a connecting joint, a negative pressure chamber and negative pressure holes. The negative pressure chamber is opened inside the body of the placement base. The connecting joint is fixedly installed below the body of the placement base and communicates with the negative pressure chamber. Several negative pressure holes are opened on the upper surface of the body of the placement base and communicate with the negative pressure chamber. The upper surface of the placement base body is fitted with a thin insulating sheet of wire and cable to be measured, so that negative pressure suction is generated at the negative pressure hole to adsorb the wire and cable insulation sheet, so that it is firmly placed on the upper surface of the placement base body body.

[0010] In a preferred embodiment, the measuring device stage further includes a rotating groove, a rotating annular groove, a rolling ball, a rotating ring seat, a positioning ring, an adjusting pressing head, a first push plate, a first reset spring, and a positioning groove; The rotating groove is formed on the upper surface of the movable plate, and a bearing is installed on the inner side of the rotating groove. The rotating annular groove is also formed on the upper surface of the movable plate, and its diameter is larger than that of the rotating groove. Several of the rolling balls are movably fitted into the inner and outer sides of the rotating annular groove. The rotating ring seat is a rotating structure set inside the rotating ring groove. Both the inner and outer sides of the rotating ring seat are provided with annular arc grooves and are movably fitted and connected with the rolling ball. The positioning ring is fixedly set on the upper surface of the moving plate and has a diameter larger than the rotating ring groove. The adjusting press head is movably fitted inside the positioning ring, the first push plate is fixedly set outside the adjusting press head, the first reset spring is set on the side of the first push plate near the center of the positioning ring, and the two are fixedly connected, and the positioning groove is opened at the position coaxial with the adjusting press head; The support assembly also includes a rotating shaft, a positioning head, a second push plate, and a second return spring. Several positioning heads are movably fitted into the inner side of the support base and are evenly distributed around the circumference. The second push plate is fixedly installed on the side of the positioning head near the center of the support base. The second reset spring is located on the side of the second push plate near the center of the support base, and the two are fixedly connected. After the positioning head enters the positioning groove, it is engaged with each other under the action of the rebound force of the second reset spring. The rotating shaft is fixedly located on the lower surface of the support base and is installed through the bearing. When the support assembly needs to be rotated and adjusted, pressing the adjustment press head compresses the first return spring, causing the other end of the adjustment press head to push the positioning head to move and disengage it from the positioning groove. Then, rotating the support assembly allows for its rotational adjustment.

[0011] In a preferred embodiment, the measuring device platform further includes a mounting slot located at the middle of the upper surface of the gantry frame, and the laser assembly further includes a ring frame, a first screw frame, a first screw, a second screw frame, a second screw, an adjusting seat, a first threaded seat, and a second threaded seat. The first screw bracket is fixedly mounted on the upper end of the ring frame, and the second screw bracket is mounted below the first screw bracket and fixedly connected to the ring frame. The first screw bracket and the second screw bracket are arranged in a vertical structure, and the first screw is a rotating structure mounted inside the first screw bracket. The second screw is a rotating structure disposed inside the second screw frame. The first threaded seat is movably fitted inside the first screw frame and threadedly connected to the first screw. The second threaded seat is movably fitted inside the second screw frame and threadedly connected to the second screw. The adjusting seat is fixedly disposed inside the second threaded seat.

[0012] In a preferred embodiment, the laser assembly further includes a hinge cavity, a hinge ball, a vertical rod, an isolation cavity, a movable positioning seat, a positioning friction plate, a positioning adjustment groove, a positioning adjustment screw, a pressing plate, and a third reset spring. The hinge cavity is located at the lower end of the inner side of the adjustment seat. The hinge ball is a damped movable fitting structure located inside the hinge cavity. The vertical rod is fixedly located below the hinge ball. The pulsed laser emitter is fixedly located at the lower end of the vertical rod. The isolation cavity is opened above the hinge cavity, and the movable positioning seat is movably fitted inside the isolation cavity. Its lower end is a hemispherical groove structure. The two positioning friction pieces are fixedly set on the lower groove surface of the movable positioning seat and the outer side of the top of the hinge ball. The positioning adjustment groove is located inside the adjustment seat and is a vertical structure. The positioning adjustment screw is a rotating structure located inside the positioning adjustment groove. The extrusion plate is movably fitted inside the isolation cavity and is threadedly connected to the positioning adjustment screw. The third return spring is located above the movable positioning seat, with its lower end fixedly connected to the movable positioning plate. After passing through the guide hole on the upper surface of the extrusion plate, it is fixedly connected to the upper end of the isolation cavity. The rotation of the positioning adjustment screw causes the extrusion plate to move closer to the movable positioning seat, which in turn moves the movable positioning seat closer to the hinge ball. The contact between the two positioning friction plates generates high friction to prevent the subsequent rotation of the hinge ball.

[0013] In a preferred embodiment, the measuring device stage further includes slots, a first ratchet, and a first electrical plug. The three slots are formed on the upper surface of the measuring stage body and are evenly distributed around the circumference. The first ratchet is fixedly disposed on the inner side of the slot, the first electrical plug is disposed above the measuring platform body, and the support assembly also includes a plug, a second ratchet, an electromagnetic coil, a pressure base, a first conductive head, a separation spring, a second conductive head, a second electrical plug, and a storage battery; The three plugs are fixedly disposed on the lower surface of the support base and are evenly distributed in a circle. The second ratchet is fixedly disposed on the outer side of the plug, which is opposite to the first ratchet and meshes with it. Several sets of electromagnetic coils are respectively disposed on the inner side of the first and second ratchets of the plug. The pressure seat is movably fitted inside the support base. The first conductive head is fixedly installed below the pressure seat, and the second conductive head is installed below the first conductive head. The two are not in contact when not under external force. The separation spring is installed between the first conductive head and the second conductive head. The second electrical plug is located below the support base and is electrically connected to the second conductive head. The second conductive head is used in conjunction with the first conductive head and is plugged into each other. The battery is located inside the support base and is electrically connected to the first conductive head via a cable. Several sets of electromagnetic coils are connected in parallel in the circuit, and the electromagnetic coils located on the first ratchet and the second ratchet have different polarities on opposite sides after being energized. When the first conductive head contacts the second conductive head, the electromagnetic coils on the inner sides of the first ratchet and the second ratchet located in the same position generate the same polarity. Under the action of the same polarity, they generate a repulsive magnetic force to disengage from the engagement of the first ratchet and the second ratchet. At this time, pulling the support assembly upwards can complete the quick disassembly.

[0014] After adopting the above technical solution, the beneficial effects of the present invention are: By setting up a measuring device platform, support components, a placement base, and a laser component, the insulation sheet of the wire and cable is placed on a pulsed laser emitter and a photodiode receiver. A precision uniform-speed moving platform drives a moving plate to move linearly and uniformly, causing the emitted laser to be blocked when the insulation sheet passes by. The number of laser pulses blocked by the insulation sheet can be used to calculate the radius value of the insulation sheet according to a formula. This value is the insulation thickness of the wire and cable. This measurement method reduces the reliance on manual operation and the influence of human subjectivity. During the measurement stage, rotating the support component can change the measurement position of the insulation sheet, and multiple sets of measurements can improve accuracy.

[0015] By setting up a measuring device platform and support components, the support components have a detachable structure. During installation, the operator only needs to apply downward force to insert the plug into the socket to engage the first and second ratchet teeth and prevent upward movement. During disassembly, the electromagnetic coil circuit is simply turned on to generate opposite magnetic forces between the first and second ratchet teeth, causing them to repel each other and disengage. Then, the device can be pulled upwards, thus achieving convenient assembly and disassembly.

[0016] This invention also relates to a method for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting, characterized by comprising the following steps: Step 1: Adjust the optical path of the pulsed laser emitter and the photodiode receiver so that the laser beam is collinear with the optical axis of the receiver and perpendicular to the moving direction of the precision uniform speed moving platform. Lock the laser assembly to ensure the stability of the laser beam. Place the insulating sheet to be tested flat on the upper surface of the placement base body, start the external negative pressure device, and fix the sheet by adsorption through the negative pressure hole. Step 2: Start the precision uniform speed moving platform to drive the thin sheet through the laser optical path at a set speed v. The counting control module simultaneously collects the laser emitter pulse frequency f and the shielding status of the photodiode receiver, counts the number of pulses N during the period when the laser is blocked by the thin sheet, and the period time between two shielding points is T1 = 1 / f. The total time for the number of pulses N blocked by the standard thin sheet is TN = T1×N. The thickness calculation formula is: d1=TN×v=T1×N×v=(N×v) / f, to calculate the forward thickness. Then, control the platform to move in the reverse direction and repeat the above scanning and counting to obtain the reverse thickness d2. Take the arithmetic mean of d1 and d2 as the thickness measurement value at this position. Step 3: Press the adjustment button to disengage the positioning head from the positioning groove, rotate the support component to the preset angle and release it to allow the positioning head to re-embed into the positioning groove to achieve angle positioning; repeat step 2 to obtain the thickness value at that angle; measure the thickness data sequentially at multiple preset angle positions in this way. Step 4: The data processing module performs statistical analysis on all angle thickness values ​​obtained in Step 3, removes outliers, and takes the arithmetic mean as the final insulation thickness measurement result of the wire and cable insulation sheet. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a wire and cable insulation sheet thickness measuring device based on pulsed laser shielding counting according to the present invention.

[0019] Figure 2 This is a schematic diagram of the measuring device platform in the wire and cable insulation sheet thickness measuring device based on pulsed laser shielding counting according to the present invention.

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0021] Figure 4This is a partial cross-sectional schematic diagram of the measuring device platform in the wire and cable insulation sheet thickness measuring device based on pulsed laser shielding counting according to the present invention.

[0022] Figure 5 This is a schematic diagram of the first direction structure of the support component in the wire and cable insulation sheet thickness measuring device based on pulsed laser shielding counting according to the present invention.

[0023] Figure 6 This is a schematic diagram of the second direction structure of the support component in a wire and cable insulation sheet thickness measuring device based on pulsed laser shielding counting according to the present invention.

[0024] Figure 7 This is a partial cross-sectional view of the support component in the first direction of the present invention, which is a device for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting.

[0025] Figure 8 This is a simplified circuit diagram of the electromagnetic coil of a wire and cable insulation sheet thickness measuring device based on pulsed laser shielding counting, according to the present invention.

[0026] Figure 9 This is a partial cross-sectional view of the support component in the second direction of the present invention, which is a device for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting.

[0027] Figure 10 This is a partial cross-sectional view of the support component in a wire and cable insulation sheet thickness measuring device based on pulsed laser shielding counting according to the present invention.

[0028] Figure 11 This is a schematic diagram of the placement base in a wire and cable insulation sheet thickness measuring device based on pulsed laser shielding counting according to the present invention.

[0029] Figure 12 This is a schematic diagram of the structure of the device for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting, according to the present invention, which removes the insulation sheet from the placement seat.

[0030] Figure 13 This is a partial cross-sectional schematic diagram of the placement seat in the wire and cable insulation sheet thickness measuring device based on pulsed laser shielding counting according to the present invention.

[0031] Figure 14 This is a schematic diagram of the laser component in a wire and cable insulation sheet thickness measurement device based on pulsed laser shielding counting according to the present invention.

[0032] Figure 15 This is a partial cross-sectional schematic diagram of the laser component in a wire and cable insulation sheet thickness measurement device based on pulsed laser shielding counting according to the present invention.

[0033] Figure 16 for Figure 15 Enlarged view of section B in the middle.

[0034] In the diagram, 100-measuring device platform, 101-measuring platform body, 102-precision uniform speed moving platform, 103-moving plate, 104-rotating groove, 105-rotating ring groove, 106-ball, 107-rotating ring seat, 108-slot, 109-first ratchet, 110-first electrical plug, 111-positioning ring, 112-adjusting press head, 113-first push plate, 114-first return spring, 115-photodiode receiver, 116-gantry frame, 117-mounting groove, 118-positioning groove, 119-crossbar, 120-narrow band filter; Support assembly, 201-support base, 202-rotating shaft, 203-leveling stud, 204-plug, 205-second ratchet, 206-electromagnetic coil, 207-positioning head, 208-second push plate, 209-second return spring, 210-pressure seat, 211-first conductive head, 212-separation spring, 213-second conductive head, 214-second electrical plug, 215-support plate, 216-negative pressure conduit, 217-bellows, 218-air pipe connector, 219-rotating seat, 220-battery; Placement base, 301-placement base body, 302-connecting connector, 303-negative pressure chamber, 304-negative pressure hole; Laser assembly, 401-ring frame, 402-first screw frame, 403-first screw, 404-second screw frame, 405-second screw, 406-adjusting seat, 407-hinge cavity, 408-hinge ball, 409-vertical rod, 410-pulsed laser emitter, 411-isolation cavity, 412-movable positioning seat, 413-positioning friction plate, 414-positioning adjustment groove, 415-positioning adjustment screw, 416-pressing plate, 417-first threaded seat, 418-second threaded seat, 419-third return spring. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1-16 This invention provides a technical solution: a device and method for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting, comprising: Please see Figures 1-7 and Figures 10-16 Example 1: Specifically, before measuring the insulation thickness of the wires and cables, the pulsed laser emitter 410 and the photodiode receiver 115 are preset and adjusted (in this invention, the pulsed laser emitter 410 is preferably with a wavelength of 532nm (green light), a pulse frequency range of 1kHz - 10kHz, a spot diameter of 5μm - 50μm, and an output power of 5mW - With a power consumption of 20mW, frequency stability ≤ ±0.001%, and ensuring precise controllability of pulse emission counts, the photodiode receiver 115 is preferably configured to have a response wavelength matching the 532nm laser, a response speed ≥ 100kHz, and an output TTL level signal. The pulsed laser emitter 410 is positioned above the moving path of the moving plate 103, and the photodiode receiver 115 is positioned below this path, with their optical axes overlapping. The support plate 215 and the placement base 301 form a transparent channel in the measurement area traversed by the optical axis. A narrow-band filter 122 is positioned on the light-incident side of the photodiode receiver 115. The counting control module receives the trigger signal from the pulsed laser emitter 410, the output signal from the photodiode receiver 115, and the position encoder signal from the precision uniform speed moving platform 102. The counting control module establishes a synchronous sampling gate for each laser trigger signal and records the received pulse amplitude in the unobstructed state as... Baseline; It is recommended to first use 20% of the baseline amplitude as the shading judgment threshold. When three consecutive sampling pulses are below this threshold, the continuous shading interval is confirmed to start. When three consecutive sampling pulses are above this threshold, the continuous shading interval is confirmed to end. The data processing module sequentially saves the number of pulses, corresponding platform position, scanning direction, pulse frequency and platform speed of the first continuous shading interval and the second continuous shading interval. During the adjustment process, the user uses existing tools (such as but not limited to plumb bob and laser plumb line) to rotate the first screw 403 in both directions. Under the threaded engagement, the first threaded seat 417 moves linearly. The user also rotates the second screw 405 in both directions. Under the threaded engagement, the second threaded seat 418 moves linearly to adjust the adjustment seat 406 in the vertical direction. Then, according to the vertical standard setting, the vertical rod 409 is rotated in all directions so that the hinge ball 408 rotates within the hinge cavity 407. In this invention, all components are miniature, thus requiring the use of existing tools (including but not limited to miniature screwdrivers and miniature wrenches) to rotate the positioning adjustment screw 415 and, under threaded engagement, drive the pressing plate 416 downwards. This causes the pressing plate 416 to contact the movable positioning seat 412 and drive it downwards, ultimately bringing the grooved surface of the movable positioning seat 412 into contact with the top of the outer surface of the hinge ball 408. This allows the two positioning friction plates 413 to contact, generating high frictional resistance. This frictional resistance is much greater than the damping resistance between the hinge ball 408 and the hinge cavity 407, and also much greater than the resistance generated by the hinge ball 408 under the combined gravitational force of the hinge ball 408, the vertical rod 409, and the pulsed laser emitter 410. The free movement force generated at this time means that the articulated ball 408 is in a relatively stable state and cannot be interfered with by gravity or external forces. It cannot produce displacement and can maintain the final position adjustment state of the pulse laser emitter 410. After the adjustment is completed, the pulse laser emitter 410 and the photodiode receiver 115 meet the above requirements. (When it is necessary to rotate the articulated ball 408, the positioning adjustment screw 415 rotates in the opposite direction, causing the pressing plate 416 to move upward to release the pressure on the movable positioning plate 412. At this time, the movable positioning plate 412 can be pulled upward under the action of the rebound force of the third reset spring 419, so that the movable positioning plate 412 is separated from the frictional contact of the articulated ball 408 to restore the damped rotation state of the articulated ball 408.) Next, the insulating sheet of the insulation layer of the wire and cable to be measured is taken and placed on the upper surface of the placement base body 301 so that the insulating sheet is located in the measurement area. The external negative pressure device delivers the negative pressure suction and delivers it through the negative pressure conduit 216. Meanwhile, the corrugated pipe 217 is in the extended state during the quick sealing connection between the air pipe connector 218 and the connecting connector 302 (this connector uses conventional pipe connectors in the prior art, which can achieve a quick sealing connection by plugging them in. It is a mature existing technology and will not be described in detail here). After the connection is completed, it is compressed. The negative pressure suction is then transferred through the negative pressure cavity 303 and finally generated through the negative pressure hole 304 to negatively adsorb the insulating sheet placed on the upper surface of the placement base body 301, so that it is firmly attached to the upper surface of the placement base body 301. Then, the precision uniform speed moving platform 102 (preferably driven by a stepper motor with a moving speed error ≤ ±0.01mm / s) can be controlled to drive the moving plate 103 to move linearly laterally, so that the insulating sheet passes through the area between the pulse laser emitter 410 and the photodiode receiver 115, blocking the laser emitted by the pulse laser emitter 410 in the thickness area. By the number of laser blocking pulses by the insulating sheet, combined with the shielding time and the moving speed of the moving plate 103, the "radius" value of the insulating sheet can be calculated. This value corresponds to the insulation thickness of the wire and cable. During the measurement process, to ensure the accuracy of the final value, the measurement at the same location needs to be performed twice, and the average value is taken. Then, the circumference of the preset positioning head 207 is evenly distributed. The user presses the adjusting pressing head 112, causing it to push the positioning head 207 out of the engagement with the positioning groove 118. At this time, the user rotates the support assembly 200 and then removes the external force applied to the adjusting pressing head 112. Driven by the rebound force of the first return spring 114, the adjusting pressing head 112 moves away from the center of the positioning circumference 111. During the rotation process, when the positioning head 207 at the next position enters the area of ​​the positioning groove 118, it will be driven by the second return spring 209 to embed itself into the positioning groove 118, thereby achieving automatic positioning (the circumferential distribution of the positioning head 207 is based on a preset, such as setting the distance between adjacent positioning heads 207 to 15°, which can achieve angle adjustment of 15°, 30°, 45°, 60°...). Then, the above process is repeated to complete the thickness measurement of the insulating sheet at this point, and the above operation is repeated to monitor multiple positions in order to finally achieve the measurement of the insulation thickness of the wire and cable. In the circumferential rotation adjustment of the support component 200, the rotation axis is determined by the bearing through the rotating shaft 202. The rotating ring seat 107 is set in the rotating ring groove 105. The rotating ring seat 107 is supported by a number of rolling balls 106, so that it is always kept concentric with the rotating shaft 202. The rolling balls 106 reduce the rotational resistance of the rotating ring seat 107. During the rotation adjustment process, the user only needs to apply an initial rotational force to the support component 200 to realize the subsequent inertial rotation of the support component 200 and the fitting and positioning of the positioning head 207 into the positioning groove 118.

[0037] Please see Figures 1-9 Example 2: Based on the first embodiment described above, further, the support component 200 in this invention is an independent and detachable structure. During the installation of the support component 200, the user moves the movable plate 103 to a position that avoids the crossbar 119, keeps the rotating shaft 202 concentric with the bearing, and then connects the rotating shaft 202 through the bearing. The three sets of plugs 204 are inserted into the three sets of slots 108. Due to the reverse tooth shape of the first ratchet 109 and the second ratchet 205, the second ratchet 205 can continuously generate an offset force on the plug 204 during downward movement, causing it to bend, so as to continuously realize the engagement-disengagement state of the first ratchet 109 and the second ratchet 205. After the final engagement is completed, the first ratchet 109 and the second ratchet 205 are firmly engaged and cannot continue to move downward or upward. At this time, the support component 200 is firmly fixed. During the installation of the support assembly 200, the user did not press the pressure seat 210, thus the conductive circuit of the electromagnetic coil 206 was not connected. When it is necessary to disassemble the support assembly 200, the user presses the pressure seat 210, causing it to move the first conductive head 211 downwards, compressing the separation spring 212, and finally causing the first conductive head 211 to contact the second conductive head 213. At this time, the circuit of the electromagnetic coil 206 is connected, and the battery 220 provides power to each set of electromagnetic coils 206. When energized, the first ratchet 109 and the second ratchet 205 have the same polarity on opposite sides, which causes them to repel each other. The second ratchet 205 will disengage from the first ratchet 109. Even if the user pulls the support assembly 200 upwards to disengage the shaft 202 from the bearing, the support assembly 200 can be quickly disassembled, thus enabling convenient disassembly and assembly of the support assembly 200.

[0038] This invention also provides the following device calibration steps: Instrument Calibration: According to the GB / T 2951.11-2008 standard, select a first-class standard insulating sheet (thickness error ≤ ±0.1μm), with thicknesses of 0.1mm, 0.5mm, 1mm, 2mm, 5mm, and 10mm, respectively. Fix the standard sheet on a precision uniform speed moving platform. Set the laser emitter pulse frequency f and the platform moving speed v, turn on the device, and the laser emitter emits pulsed laser light. The platform moves the standard sheet through the beam path at a uniform speed. The counting control module counts the number N of laser pulses blocked by the standard sheet. Repeat the measurement 3-5 times, take the average value of the number of shielding times each time, and fit the calibration formula: d=k×N+b, where d is the thickness of the insulating sheet, k is the slope, and b is the intercept, which is determined by the characteristics of the insulating material and the equipment parameters.

[0039] Those skilled in the art, combining the description of the counting control module and data processing module in this invention with existing technology, can undoubtedly conclude how to implement it, which requires creative effort, and will not be elaborated further.

[0040] This invention also relates to a method for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting, characterized by comprising the following steps: Step 1: Adjust the optical path of the pulsed laser emitter 410 and the photodiode receiver 115 so that the laser beam is collinear with the optical axis of the receiver and perpendicular to the moving direction of the precision uniform speed moving platform 102. Lock the laser assembly 400 to ensure the stability of the laser beam. Place the insulating sheet to be tested flat on the upper surface of the placement base body 301, start the external negative pressure device, and fix the sheet by adsorption through the negative pressure hole 304. Step 2: Start the precision uniform speed moving platform 102 to drive the thin sheet through the laser optical path at a set speed v in the forward direction. The counting control module simultaneously collects the laser emitter pulse frequency f and the shielding status of the photodiode receiver 115, counts the number of pulses N during the period when the laser is blocked by the thin sheet, and the period time between two shielding points is T1 = 1 / f. The total time for the number of pulses N blocked by the standard thin sheet is TN = T1×N. The thickness calculation formula is: d1=TN×v=T1×N×v=(N×v) / f, to calculate the forward thickness. Then control the platform to move in the reverse direction and repeat the above scanning and counting to obtain the reverse thickness d2. Take the arithmetic mean of d1 and d2 as the thickness measurement value at this position. Step 3: Press the adjustment pressing head 112 to disengage the positioning head 207 from the positioning groove 118, rotate the support assembly 200 to the preset angle and release it, so that the positioning head 207 is re-embedded into the positioning groove 118 to achieve angle positioning; repeat step 2 to obtain the thickness value at this angle; measure the thickness data in sequence at multiple preset angle positions to obtain a set of thickness data. Step 4: The data processing module performs statistical analysis on all angle thickness values ​​obtained in Step 3, removes outliers, and takes the arithmetic mean as the final insulation thickness measurement result of the wire and cable insulation sheet.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting, comprising: The measuring device stage (100), support assembly (200), placement seat (300) and laser assembly (400) are characterized in that the measuring device stage (100) includes a measuring stage body (101), a precision uniform speed moving platform (102), a moving plate (103), a cross frame (119), a photodiode receiver (115) and a gantry frame (116). The precision uniform speed moving platform (102) is fixedly installed above the measuring table body (101). The precision uniform speed moving platform (102) is a precision screw drive structure. The moving plate (103) is movably installed above the precision uniform speed moving platform (102). The gantry frame (116) is fixedly installed above the measuring table body (101). The cross frame (119) is installed above the measuring table body (101) and is fixedly connected to the gantry frame (116) in the front-back direction. The laser assembly (400) is installed inside the gantry (116) and fixed by bolts. The laser assembly (400) includes a pulsed laser emitter (410). The support assembly (200) is disposed above the movable plate (103). The placement seat (300) is disposed above the support assembly (200). The support assembly (200) includes a support plate (215). The placement base (300) includes a placement base body (301). Both the support plate (215) and the placement base body (301) are made of high-transparency quartz glass. The measuring stage body (101) is provided with a counting control module for synchronously acquiring the laser emission frequency, receiver signal shielding status and platform movement status, and real-time counting of the number of laser pulses shielded by the insulating sheet, and a data processing module for receiving the shielding count, laser emission frequency and platform movement speed data transmitted by the counting control module. The counting control module is electrically connected to the pulse laser emitter (410), photodiode receiver (115) and precision uniform speed moving platform (102).

2. The device for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting as described in claim 1, characterized in that: The photodiode receiver (115) is provided with a narrowband filter (120) that matches the wavelength of the pulsed laser emitter (410) on the light-incident side. The precision uniform speed moving platform (102) is provided with a position encoder. The counting control module establishes a synchronous sampling gate with the trigger signal of the pulsed laser emitter (410) and compares the pulse amplitude of the photodiode receiver (115) with the unobstructed baseline threshold. The condition for the start or end of shading is that at least three consecutive sampling pulses are in the same state. The support assembly (200) also includes a support base (201), leveling studs (203), a negative pressure conduit (216), a bellows (217), an air pipe connector (218), and a rotating seat (219). The three leveling studs (203) are threaded and screwed into the inside of the support base (201). The three leveling studs (203) are evenly distributed around the circumference. The rotating seat (219) is a rotating connection structure located above the leveling studs (203). The upper end of the rotating seat (219) is also hinged to the support plate (215). The negative pressure conduit (216) is located inside the support plate (215). The corrugated pipe (217) is located at the end of the negative pressure conduit (216) near the support plate (215). The tracheal connector (218) is located above the corrugated pipe (217). The other end of the negative pressure conduit (216) is connected to an external negative pressure device, so that the external negative pressure device generates negative pressure suction and guides it through the negative pressure conduit (216). The corrugated pipe (217) is a metal corrugated pipe. During the connection of the tracheal connector (218), the corrugated pipe (217) is extended and compressed after the connection is completed. The placement base (300) further includes a connecting joint (302), a negative pressure chamber (303), and negative pressure holes (304). The negative pressure chamber (303) is opened inside the placement base body (301). The connecting joint (302) is fixedly installed below the placement base body (301) and communicates with the negative pressure chamber (303). Several negative pressure holes (304) are opened on the upper surface of the placement base body (301) and communicate with the negative pressure chamber (303). The upper surface of the placement base body (301) is fitted with a thin insulating sheet of wire and cable to be measured, so that negative pressure suction is generated at the negative pressure hole (304) to adsorb the wire and cable insulating sheet, so that it is firmly placed on the upper surface of the placement base body (301).

3. The device for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting as described in claim 2, characterized in that: The measuring device platform (100) also includes a rotating groove (104), a rotating ring groove (105), a ball (106), a rotating ring seat (107), a positioning ring (111), an adjusting pressing head (112), a first push plate (113), a first reset spring (114), and a positioning groove (118). The rotating groove (104) is opened on the upper surface of the moving plate (103), and a bearing is installed on the inner side of the rotating groove (104). The rotating annular groove (105) is also opened on the upper surface of the moving plate (103), and its diameter is larger than that of the rotating groove (104). Several of the rolling balls (106) are movably fitted into the inner and outer sides of the rotating annular groove (105). The rotating ring seat (107) is a rotating structure located inside the rotating ring groove (105). The rotating ring seat (107) has annular arc grooves on both its inner and outer sides, and is movably fitted and connected to the rolling ball (106). The positioning ring (111) is fixedly set on the upper surface of the moving plate (103), and its diameter is larger than that of the rotating ring groove (105). The adjusting press head (112) is movably fitted inside the positioning ring (111), the first push plate (113) is fixedly set outside the adjusting press head (112), the first return spring (114) is set on the side of the first push plate (113) near the center of the positioning ring (111), and the two are fixedly connected. The positioning groove (118) is opened at a position coaxial with the adjusting press head (112). The support assembly (200) also includes a rotating shaft (202), a positioning head (207), a second push plate (208), and a second return spring (209). Several positioning heads (207) are movably fitted inside the support base (201) and are evenly distributed around the circumference. The second push plate (208) is fixedly installed on the side of the positioning head (207) near the center of the support base (201). The second return spring (209) is located on the side of the second push plate (208) near the center of the support base (201), and the two are fixedly connected. After the positioning head (207) enters the positioning groove (118), it is engaged with each other under the action of the rebound force of the second return spring (209). The rotating shaft (202) is fixedly located on the lower surface of the support base (201) and is set through the bearing. When the support assembly (200) needs to be rotated and adjusted, pressing the adjustment press head (112) can compress the first return spring (114), causing the other end of the adjustment press head (112) to push the positioning head (207) to move and disengage it from the positioning groove (118). Then, rotating the support assembly (200) can rotate it and adjust it.

4. The device for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting as described in claim 1, characterized in that: The measuring device platform (100) also includes a mounting slot (117), which is located in the middle of the upper surface of the gantry (116). The laser assembly (400) also includes a ring frame (401), a first screw frame (402), a first screw (403), a second screw frame (404), a second screw (405), an adjusting seat (406), a first threaded seat (417), and a second threaded seat (418). The first screw bracket (402) is fixedly mounted on the upper end of the ring bracket (401), and the second screw bracket (404) is mounted below the first screw bracket (402) and fixedly connected to the ring bracket (401). The first screw bracket (402) and the second screw bracket (404) are arranged in a vertical structure, and the first screw (403) is a rotating structure mounted inside the first screw bracket (402). The second screw (405) is a rotating structure and is located inside the second screw frame (404). The first threaded seat (417) is movably fitted inside the first screw frame (402) and threadedly connected to the first screw (403). The second threaded seat (418) is movably fitted inside the second screw frame (404) and threadedly connected to the second screw (405). The adjusting seat (406) is fixedly located inside the second threaded seat (418).

5. The device for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting as described in claim 4, characterized in that: The laser assembly (400) also includes a hinge cavity (407), a hinge ball (408), a vertical rod (409), an isolation cavity (411), a movable positioning seat (412), a positioning friction plate (413), a positioning adjustment groove (414), a positioning adjustment screw (415), a pressing plate (416), and a third return spring (419). The hinge cavity (407) is located at the lower end of the inner side of the adjusting seat (406), the hinge ball (408) is a damped movable fitting structure located inside the hinge cavity (407), the vertical rod (409) is fixedly located below the hinge ball (408), and the pulsed laser emitter (410) is fixedly located at the lower end of the vertical rod (409). The isolation cavity (411) is located above the hinge cavity (407). The movable positioning seat (412) is movably fitted inside the isolation cavity (411). Its lower end is a hemispherical groove structure. The two positioning friction plates (413) are fixedly installed on the groove surface at the lower end of the movable positioning seat (412) and the outer surface of the top of the hinge ball (408). The positioning adjustment groove (414) is located inside the adjustment seat (406) and is a vertical structure. The positioning adjustment screw (415) is a rotating structure located inside the positioning adjustment groove (414). The extrusion plate (416) is movably fitted inside the isolation cavity (411) and is threadedly connected to the positioning adjustment screw (415). The third reset spring (419) is located above the movable positioning seat (412), and its lower end is fixedly connected to the movable positioning plate (412). After passing through the guide through hole on the upper surface of the extrusion plate (416), it is fixedly connected to the upper end of the isolation cavity (411), so that the positioning adjustment screw (415) rotates and drives the extrusion plate (416) to move closer to the movable positioning seat (412), so that the movable positioning seat (412) moves closer to the hinge ball (408). The two positioning friction plates (413) come into contact and generate high friction to prevent the subsequent rotation of the hinge ball (408).

6. The device for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting as described in claim 1, characterized in that: The measuring device stage (100) also includes slots (108), a first ratchet (109) and a first electrical plug (110). The three slots (108) are located on the upper surface of the measuring stage body (101) and are evenly distributed around the circumference. The first ratchet (109) is fixedly disposed on the inner side of the slot (108), the first electrical plug (110) is disposed above the measuring platform body (101), and the support assembly (200) also includes a plug (204), a second ratchet (205), an electromagnetic coil (206), a pressure seat (210), a first conductive head (211), a separation spring (212), a second conductive head (213), a second electrical plug (214), and a storage battery (220). The three plugs (204) are fixedly disposed on the lower surface of the support base (201) and are evenly distributed in a circle. The second ratchet (205) is fixedly disposed on the outer side of the plug (204), and is disposed opposite to the first ratchet (109) and meshes with each other. Several sets of electromagnetic coils (206) are respectively disposed on the inner side of the first ratchet (109) and the second ratchet (205) of the plug (204). The pressure seat (210) is movably fitted inside the support base (201), the first conductive head (211) is fixedly installed below the pressure seat (210), and the second conductive head (213) is installed below the first conductive head (211). The two are not in contact when not under external force. The separation spring (212) is installed between the first conductive head (211) and the second conductive head (213). The second electrical plug (214) is located below the support base (201) and is electrically connected to the second conductive head (213). The second conductive head (213) is used in conjunction with the first conductive head (211) and is plugged into each other. The battery (220) is located inside the support base (201) and is electrically connected to the first conductive head (211) via a cable. Several sets of electromagnetic coils (206) are connected in parallel in the circuit. The electromagnetic coils (206) located on the first ratchet (109) and the second ratchet (205) have different polarities on opposite sides after being energized. When the first conductive head (211) and the second conductive head (213) come into contact, the electromagnetic coils (206) located on the inner side of the first ratchet (109) and the second ratchet (205) meshing in the same position generate the same polarity. Under the action of the same polarity, they generate a repulsive magnetic force to disengage from the meshing of the first ratchet (109) and the second ratchet (205). At this time, pulling the support assembly (200) upwards can complete the quick disassembly.

7. A method for measuring the thickness of wire and cable insulation sheets based on pulsed laser shielding counting, characterized in that, Includes the following steps: Step 1: Adjust the optical path of the pulsed laser emitter (410) and the photodiode receiver (115) so that the laser beam is collinear with the optical axis of the receiver and perpendicular to the moving direction of the precision uniform speed moving platform (102). Lock the laser assembly (400) to ensure the stability of the laser beam. Place the insulating sheet to be tested flat on the upper surface of the placement base body (301), start the external negative pressure device, and adsorb and fix the sheet through the negative pressure hole (304). Step 2: Start the precision uniform speed moving platform (102) to drive the thin sheet through the laser optical path at a set speed v in the forward direction. The counting control module synchronously collects the pulse frequency f of the laser emitter and the shielding status of the photodiode receiver (115), counts the number of pulses N during the period when the laser is blocked by the thin sheet, the period time between the two shielding points T1 = 1 / f, the total time of the number of pulses N blocked by the standard thin sheet is TN = T1×N, the thickness calculation formula is: d1=TN×v=T1×N×v=(N×v) / f, to calculate the forward thickness; then control the platform to move in the reverse direction, repeat the above scanning and counting to obtain the reverse thickness d2; take the arithmetic mean of d1 and d2 as the thickness measurement value at this position; Step 3: Press the adjustment press head (112) to disengage the positioning head (207) from the positioning groove (118), rotate the support assembly (200) to the preset angle and release it, so that the positioning head (207) is re-embedded into the positioning groove (118) to achieve angle positioning; repeat step 2 to obtain the thickness value at this angle; measure multiple preset angle positions in sequence to obtain a set of thickness data; Step 4: The data processing module performs statistical analysis on all angle thickness values ​​obtained in Step 3, removes outliers, and takes the arithmetic mean as the final insulation thickness measurement result of the wire and cable insulation sheet.

Images