Wire and cable length metering device and method

Abstract

The invention belongs to the technical field of cable equipment, and particularly relates to a wire and cable length metering device and method. The two sides, close to the top, of the supporting frame are rotationally connected with supporting arms. A rotating rod and a supporting rod are installed at the ends, away from the supporting frame, of the two supporting arms correspondingly, and the rotating rod is driven by a first servo motor. A supporting plate is fixedly connected to one side of the top surface of the supporting frame; a pair of symmetrically-arranged connecting rods is installed on one side of the supporting plate. The surfaces of the connecting rods are rotationally connected with upper pressing rollers. A pair of connecting arms are installed at the positions, corresponding to the connecting rods, of the top face of the supporting frame, the length of the electric wire cable is calculated through the Doppler effect generated by moving the electric wire cable through laser irradiation, the problem that when a wheel type meter counter measures the electric wire cable, slipping is generated between a measuring wheel and the electric wire cable is solved, and the measuring accuracy of the electric wire cable is improved. And the final measurement precision is further ensured.

Description

Technical Field

[0001] This invention belongs to the field of cable equipment technology, specifically a device and method for measuring the length of wires and cables. Background Technology

[0002] Wires and cables are fundamental components for power transmission, information transmission, and electrical equipment connection. They are widely used in various fields such as transportation, energy, communication, construction, and industrial production. They are typically composed of a conductor, an insulation layer, a shielding layer, and a protective layer. The conductor is usually made of copper or aluminum and is responsible for conducting current or signals. The insulation layer is made of materials such as polyvinyl chloride or polyethylene to wrap the conductor, thereby preventing leakage and short circuits. The shielding layer reduces electromagnetic interference, while the protective layer provides mechanical protection and environmental resistance. In the production and use process, in order to determine the output or surplus of wires and cables, it is necessary to measure the length of the wires and cables.

[0003] Existing technologies have proposed several solutions for measuring the length of wires and cables, such as using a wheel-type meter counter. A wheel-type meter counter mainly consists of a frame, a measuring wheel, a transmission mechanism, an encoder, and a counting display. Its main working principle is as follows: the wire or cable to be measured comes into contact with the measuring wheel during transport, driving it to roll. Each rotation of the measuring wheel represents the passage of wire or cable equal to its circumference. Thus, the length of the wire or cable is correlated with the number of rotations of the measuring wheel. The encoder then counts the number of rotations of the measuring wheel, and the length of the wire or cable is calculated from the circumference of the measuring wheel.

[0004] The aforementioned technology mainly uses wires and cables to drive the measuring wheel to rotate, thus linking the number of rotations of the measuring wheel to the length of the wires and cables. The reason why the wires and cables can drive the measuring wheel to rotate is through the friction between the wires and cables and the measuring wheel. However, when measuring long wires and cables, the measuring wheel is in contact with the wires and cables for a long time, and slippage is inevitable between the two, which leads to measurement errors. As slippage continues to occur and errors accumulate, it ultimately affects the measurement accuracy of wires and cables.

[0005] Therefore, the present invention provides a device and method for measuring the length of electric wires and cables. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a wire and cable length measuring device, comprising a support frame; support arms are rotatably connected to both sides of the support frame near the top; a rotating rod and a support rod are respectively installed at the ends of the two support arms away from the support frame, and the rotating rod is driven by a servo motor; a support plate is fixedly connected to one side of the top surface of the support frame; a pair of symmetrically arranged connecting rods are installed on one side of the support plate; upper pressure rollers are rotatably connected to the surfaces of the connecting rods; a pair of connecting arms are installed on the top surface of the support frame at the corresponding positions of the connecting rods; lower pressure rollers are rotatably connected to the tops of the two connecting arms; a laser length measuring instrument is installed on the side of the support plate near the connecting rods; the laser length measuring instrument includes a laser, an optical lens group, a photodetector, a signal processor, and a microprocessor.

[0008] Preferably, a sliding plate is fixedly connected between the two connecting rods, and the sliding plate is slidably connected to the support plate; a connecting frame is rotatably connected to the bottom of the two connecting arms; the connecting frame is slidably connected to the support plate; and a double-threaded screw is threadedly connected between the sliding plate and the connecting frame.

[0009] Preferably, each of the two connecting arms has a sliding groove on the side away from the support plate; a sliding column is slidably connected in each of the two sliding grooves; a connecting plate is fixedly connected to one end of each of the two sliding columns; a pull plate is fixedly connected to the bottom surface of the middle part of the connecting plate, and the pull plate is slidably connected to the support frame; a through hole is opened at the bottom of the pull plate; and a spring piece is fixedly connected between each of the two connecting arms and the support frame.

[0010] Preferably, the support frame is internally rotatably connected to a pair of gears, one of which is driven by a servo motor; the two gears are respectively meshed with the support arms on both sides.

[0011] Preferably, each end of the support arm away from gear one has a receiving groove; a sliding rod is slidably connected in the receiving groove; gear two is rotatably connected near the groove opening of the receiving groove, and gear two is meshed with the sliding rod; a transmission rod is rotatably connected to each side of the support arm away from the rotating rod, and the transmission rod is fixedly connected to gear two; a rotating column is rotatably connected at the rotatable connection between the support frame and the support arm, and the rotating column is connected to the transmission rod by a chain; a drive rod is rotatably connected between the two transmission rods of the support frame, and the drive rod is driven by servo motor three; the drive rod is connected to the two rotating columns by a chain.

[0012] Preferably, the end of the support rod away from the support arm has a rotating groove; an adjusting rod is rotatably connected in the rotating groove; a pair of baffles are rotatably connected to the end of the support rod away from the support arm; a gear three is slidably connected to the support rod near the opening of the rotating groove, and the gear three meshes with the two baffles; a spring is fixed between the gear three and the bottom of the rotating groove, and the diameter of the gear three is larger than the diameter of the opening of the rotating groove.

[0013] Preferably, a connecting column is fixedly connected to one end of the support rod near the support arm, and the connecting column is rotatably connected to a sliding rod on its side; an insert rod is slidably connected to the end face of the connecting column, and the insert rod passes through the connecting column; the sliding rod near the connecting column has two pairs of insertion holes at the end near the insertion rod, and the insertion holes are all adapted to the insertion rod; a magnetic column is fixedly connected to the bottom of the insertion hole, and the insertion rod is made of magnetizable metal; a handle is fixedly connected to the ends of the two insertion rods away from the insertion holes.

[0014] Preferably, the rotating rod has an installation groove on its surface; a fixed rod is fixedly connected inside the installation groove; a pair of rotating plates are rotatably connected to the surface of the fixed rod; a threaded rod is rotatably connected to the end face of the fixed rod, and the threaded rod is rotatably connected to the rotating rod; a sleeve is threadedly connected to the surface of the threaded rod; a pair of rotating plates are rotatably connected to the surface of the sleeve; and a stop plate is rotatably connected between the pair of rotating plates.

[0015] Preferably, a method for measuring the length of wires and cables, wherein the method employs a wire and cable length measuring device as described in any one of the above-mentioned methods, and the steps of the method are as follows: S1. First, the user pulls the end of the wire to be measured from the spool. Then, the user adjusts the distance between the upper and lower pressure rollers using a double-threaded screw to fit the wire. After that, the user manually pulls the end of the wire through the laser length measuring instrument and the upper and lower pressure rollers on the other side. During this time, the laser length measuring instrument will measure the manually pulled section of wire. S2. After the cable end of the wire to be tested is pulled to the rotating rod, the user needs to install the spool without the wire or cable wrapped around it on the surface of the rotating rod, and then the user fixes the end of the wire or cable to be tested on the surface of the spool without the wire or cable wrapped around it. S3. After the end of the wire to be tested is fixed on the surface of the spool without the wire wrapped around it, the servo motor drives the spool to rotate through the rotating rod, thereby continuously pulling the wire on the other side, so that the wire continuously passes through the laser length measuring instrument. When the entire wire has passed through the laser length measuring instrument, the laser length measuring instrument will display the complete length of the wire.

[0016] Preferably, when the S1 wire and cable passes through the laser length measuring instrument, the laser inside the instrument emits a laser beam with a stable frequency and excellent monochromaticity. After passing through the optical lens group, this laser beam is shaped into a small-diameter, energy-concentrated measuring spot, which is precisely focused on the surface of the wire and cable. Then, the photodetector receives the laser beam scattered back from the surface of the wire and cable. Due to the Doppler effect, the frequency of the scattered laser beam changes, and the amount of frequency change is related to the moving speed of the wire and cable. After analysis and processing by the signal processor and microprocessor, the moving speed of the wire and cable is obtained. Then, the moving speed of the wire and cable is integrated over time to finally obtain the length of the wire and cable.

[0017] The beneficial effects of this invention are as follows: 1. The wire and cable length measuring device and method of the present invention calculates the length of the wire and cable by means of the Doppler effect generated by laser irradiation of the moving wire and cable, avoiding the slippage problem between the measuring wheel and the wire and cable when measuring the wire and cable by a wheel-type meter counter, thus ensuring the final measurement accuracy. At the same time, the support rod and rotating rod on both sides of the support frame provide support for the wire and cable to be measured and its spool, while the rotating rod on the other side can wind and store the measured wire and cable. This not only facilitates the measurement of the wire and cable length, but also completes the storage of the wire and cable, thus facilitating subsequent warehousing.

[0018] 2. The wire and cable length measuring device and method of the present invention uses a chain to drive two rotating columns to rotate synchronously, and then two transmission rods are driven to rotate by the chain. Finally, the transmission rods drive the second gear to rotate. Since the second gear meshes with the slide rod, the slide rod will slide in the receiving groove under the drive of the second gear, thereby adjusting the distance between the rotating rod and the support rod to the support frame, and thus adapting to different sizes of spools. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the support plate in this invention; Figure 3 This is a schematic diagram of the skateboard structure in this invention; Figure 4 This is a schematic diagram of the connecting arm in this invention; Figure 5 This is a schematic diagram of the rotating column in this invention; Figure 6 This is a partial cross-sectional view of the support arm in this invention; Figure 7 This is a schematic diagram of the baffle structure in this invention; Figure 8 This is a partial cross-sectional view of the support rod in this invention; Figure 9 This is a partial cross-sectional view of the slide bar in this invention; Figure 10 This is a schematic diagram of the connecting column in this invention; Figure 11 This is a partial cross-sectional view of the rotating rod in this invention; Figure 12 This is a schematic diagram of the method of the present invention; In the diagram: 1. Support frame; 2. Support arm; 3. Rotating rod; 4. Support rod; 5. Support plate; 6. Connecting rod; 7. Upper pressure roller; 8. Connecting arm; 9. Lower pressure roller; 10. Laser length measuring instrument; 11. Slide plate; 12. Connecting frame; 13. Double-threaded screw; 14. Slide groove; 15. Sliding column; 16. Connecting plate; 17. Pull plate; 18. Through hole; 19. Spring piece; 20. Gear one; 21. Receiving groove; 22. 23. Slide rod; 24. Gear II; 25. Transmission rod; 26. Rotating column; 27. Drive rod; 28. Rotating groove; 29. ​​Adjusting rod; 30. Baffle; 31. Gear III; 32. Spring; 33. Connecting column; 34. Insert rod; 35. Insertion hole; 36. Magnet column; 37. Handle; 38. Mounting groove; 39. Fixing rod; 40. Rotating plate I; 41. Threaded rod; 42. Sleeve; 43. Rotating plate II; 44. Abutment plate. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 4As shown in the figure, an embodiment of the present invention provides a wire and cable length measuring device, comprising a support frame 1; support arms 2 are rotatably connected to both sides of the support frame 1 near the top; a rotating rod 3 and a support rod 4 are respectively installed at the ends of the two support arms 2 away from the support frame 1, and the rotating rod 3 is driven by a servo motor; a support plate 5 is fixedly connected to one side of the top surface of the support frame 1; a pair of symmetrically arranged connecting rods 6 are installed on one side of the support plate 5; upper pressure rollers 7 are rotatably connected to the surfaces of the connecting rods 6; a pair of connecting arms 8 are installed on the top surface of the support frame 1 at the corresponding positions of the connecting rods 6; lower pressure rollers 9 are rotatably connected to the tops of the two connecting arms 8; a laser length measuring instrument 10 is installed on the side of the support plate 5 near the connecting rods 6; the laser length measuring instrument 10 includes a laser, an optical lens group, a photodetector, a signal processor, and a microprocessor;During operation, after a section of the wire or cable on the spool has been used, in order to determine the remaining length of the wire or cable on the spool for later use, this embodiment of the invention can be used. The user first needs to install the wire or cable to be measured and its spool on the surface of the support rod 4. Then, the user pulls the wire or cable from the surface of the spool and pulls the wire or cable through the two pairs of upper pressure rollers 7 and lower pressure rollers 9. During this process, the laser length measuring instrument 10 emits a laser beam in the direction of the two connecting rods 6 through a laser. After passing through the optical lens group, the laser beam is shaped into a small-diameter and energy-concentrated measuring spot and illuminates the wire or cable to be measured. On the surface of the cable, due to the speed generated during the pulling of the cable, according to the Doppler effect, this changes the frequency of the light scattered from the measurement spot. The difference between this frequency and the original frequency is positively correlated with the speed of the cable. Therefore, when the optical detector detects the frequency of the light scattered from the measurement spot, it converts it into an electrical signal and transmits it to the signal processor and microprocessor. The signal processor then extracts the unique key information representing speed—the Doppler frequency—from the original weak electrical signal mixed with a large amount of noise, converts it into a digital signal, and transmits it to the microprocessor. The microprocessor then uses the Doppler frequency (LDV) to determine the speed. The formula calculates the data and obtains the final moving speed of the wire and cable. Then, it integrates the speed over time to obtain the length of the wire and cable. The user then pulls the wire and cable to the rotating rod 3. The user needs to install an empty spool onto the rotating rod 3. The user then fixes the pulled-out wire and cable onto the surface of the empty spool. The servo motor then drives the rotating rod 3 to rotate, which in turn drives the empty spool to rotate, ultimately winding the wire and cable around its surface. The rotation of the rotating rod 3 then allows for continuous pulling of the wire and cable, causing it to continuously pass through the laser length measuring instrument 10 and emit laser beams. The laser beam illuminates the area of ​​the cable, thus measuring the length of the entire cable. The principle behind this measurement is the Doppler effect generated by illuminating the moving cable with a laser, which calculates the cable length. This avoids the slippage problem that occurs with wheel-type meter counters when measuring cables, ensuring measurement accuracy. Simultaneously, the support rods 4 and 3 on both sides of the support frame 1 provide support for the cable and its spool, while the rotatable rod 3 winds up and stores the measured cable. This facilitates both length measurement and cable storage, making subsequent warehousing easier.

[0023] like Figures 2 to 4As shown, a sliding plate 11 is fixedly connected between the two connecting rods 6, and the sliding plate 11 is slidably connected to the support plate 5; a connecting frame 12 is rotatably connected to the bottom of the two connecting arms 8; the connecting frame 12 is slidably connected to the support plate 5; a double-threaded screw 13 is threadedly connected between the sliding plate 11 and the connecting frame 12; during operation, when it is necessary to measure wires and cables of different diameters, the user needs to screw the double-threaded screw 13, which drives the sliding plate 11 and the connecting frame 12 to move away from or towards each other, and the sliding plate 11 and the connecting frame 12 will in turn drive the connecting rods 6 and the connecting arms 8 connected to them to move closer or further away from each other, thereby driving the upper pressure roller 7 and the lower pressure roller 9 to move closer or further away from each other, thereby realizing the adjustment of the distance between the upper pressure roller 7 and the lower pressure roller 9, so that it can adapt to wires and cables of different diameters, and ensure that the upper pressure roller 7 and the lower pressure roller 9 located between the two pairs of upper pressure roller 7 and lower pressure roller 9 are set flat, thereby ensuring the measurement accuracy of the laser meter and improving the applicability of the embodiment of the present invention.

[0024] like Figures 1 to 2 As shown, each of the two connecting arms 8 has a sliding groove 14 on the side away from the support plate 5; a sliding column 15 is slidably connected in each of the two sliding grooves 14; a connecting plate 16 is fixedly connected to one end of each of the two sliding columns 15; a pull plate 17 is fixedly connected to the bottom surface of the middle part of the connecting plate 16, and the pull plate 17 is slidably connected to the support frame 1; a through hole 18 is provided at the bottom of the pull plate 17; a spring piece 19 is fixedly connected between each of the two connecting arms 8 and the support frame 1; during operation, when the user pulls the power cable through the pair of upper pressure rollers 7 and lower pressure rollers 9, in order to facilitate passing the power cable through the pair of upper pressure rollers 7 and lower pressure rollers 9, the user needs to put their finger through the through hole 18 and then pull down the pull plate 17, which will pull the connecting plate 16. The upper and lower rollers 7 and 9 descend together, causing the sliding column 15 to press down on the inner wall of the groove 14. This causes the two connecting arms 8 to rotate in a direction away from each other and squeeze the spring 19. At this time, the distance between the upper roller 7 and the lower roller 9 increases, making it easier for the user to pass the wires and cables between them. After the wires and cables have passed through them, the user releases the lever, and the squeezed spring 19 returns to its original position, pushing the two connecting arms 8 to rotate in opposite directions. This allows the upper roller 7 and the lower roller 9 to squeeze the wires and cables again, thus limiting the wires and cables. This not only makes it easy for the user to pass the wires and cables between the pair of upper roller 7 and lower roller 9, but also ensures that the upper roller 7 and the lower roller 9 clamp and limit the wires and cables.

[0025] like Figures 2 to 4As shown, a pair of gears 20 are rotatably connected inside the support frame 1, and one of the gears 20 is driven by a servo motor 2. The two gears 23 are respectively meshed with the support arms 2 on both sides. During operation, in order to facilitate the user to install the spool on the support rod 4 and the rotating rod 3, the user can start the servo motor 2, one of the gears 20 will rotate, and then the two gears 20 will drive the two support arms 2 to rotate synchronously in opposite directions. Thus, by rotating the support arms 2, the support rod 4 and the rotating rod 3 can be rotated to a lower position, which makes it easier for the user to install the spool on the rotating rod 3 and the support rod 4. Then, the user can control the two gears 20 again to drive the support arms 2 to rotate, and the support arms 2 will transfer the rotating rod 3 and the rotating rod 4 to a higher position, thereby avoiding friction between the spool and the ground during rotation.

[0026] like Figure 1 , Figure 5 So and Figure 6 As shown, each end of the support arm 2 away from the gear 20 has a receiving groove 21; a sliding rod 22 is slidably connected in the receiving groove 21; a gear 23 is rotatably connected near the opening of the receiving groove 21, and the gear 23 meshes with the sliding rod 22; a transmission rod 24 is rotatably connected to each side of the support arm 2 away from the rotating rod 3, and the transmission rod 24 is fixedly connected to the gear 23; a rotating column 25 is rotatably connected at the rotatable connection between the support frame 1 and the support arm 2, and the rotating column 25 is connected to the transmission rod 24 by a chain; a drive rod 26 is rotatably connected between the two transmission rods 24 of the support frame 1, and the drive rod 26 is driven by a servo motor 3; the drive rod 26... The 6 is connected to the two rotating columns 25 by a chain. During operation, when it is necessary to install spools of different diameters, in order to avoid collision or friction between the spools and the support arm 2, the user can drive the drive rod 26 to rotate via the servo motor 3. Then, the drive rod 26 drives the two rotating columns 25 to rotate synchronously via the chain. After that, the two transmission rods 24 will drive the two transmission rods 24 to rotate via the chain. Finally, the transmission rods 24 drive the gear 23 to rotate. Since the gear 23 meshes with the slide rod 22, the slide rod 22 will slide in the receiving groove 21 under the drive of the gear 23, thereby adjusting the distance between the rotating rod 3 and the support rod 4 to the support frame 1, and thus adapting to spools of different sizes.

[0027] like Figures 6 to 8As shown, a rotating groove 27 is provided at the end of the support rod 4 away from the support arm 2; an adjusting rod 28 is rotatably connected within the rotating groove 27; a pair of baffles 29 are rotatably connected at the end of the support rod 4 away from the support arm 2; a gear 30 is slidably connected to the support rod 4 near the opening of the rotating groove 27, and the gear 30 meshes with the two baffles 29; a spring 31 is fixed between the gear 30 and the bottom of the rotating groove 27, and the diameter of the gear 30 is larger than the diameter of the opening of the rotating groove 27; during operation, after the wire / cable to be measured and its spool are fitted onto the support rod 4, the user can rotate the adjusting rod 28, which will drive the gear 30 to rotate. This causes the baffle 29, which meshes with gear 30, to rotate, thus extending the baffle 29 out of the end face of the support rod 4. This restricts the spool, preventing it from slipping off the surface of the support rod 4 during rotation. At the same time, the spring 31 presses gear 30 tightly against the end face of the support rod 4, increasing the maximum static friction between gear 30 and the end face of the support rod 4. When the user rotates gear 30 to a suitable angle, the friction between gear 30 and the end face of the support rod 4 can fix gear 30, preventing it from rotating arbitrarily. This also fixes the two baffles 29, preventing them from rotating arbitrarily and causing the spool to slip off the surface of the support rod 4.

[0028] like Figure 1 , Figure 9 and Figure 10 As shown, the support rod 4 is slidably connected to a connecting post 32 at one end near the support arm 2, and the connecting post 32 is rotatably connected to a sliding rod 22 on its side; an insert rod 33 is slidably connected to the end face of the connecting post 32, and the insert rod 33 passes through the connecting post 32; the sliding rod 22 near the connecting post 32 has two pairs of insertion holes 34 at the end near the insert rod 33, and the insertion holes 34 are all adapted to the insert rod 33; a magnet post 35 is fixedly connected to the bottom of the insertion hole 34, and the insert rod 33 is made of magnetizable metal; the ends of the two insert rods 33 away from the insertion holes 34 are jointly fixedly connected to a handle 36; during operation, when the spool is sleeved on the support rod 4, it is used... The user can also pull the handle 36 to pull the plug rod 33 out of the socket 34. At this time, the connecting post 32 can rotate on the end face of the slide rod 22, thereby driving the support rod 4 on the surface of the connecting post 32 to rotate as well, so that the plug rod 33 is aligned with the next pair of sockets 34. Then, the user inserts the plug rod 33 into the pair of sockets 34 through the handle 36, and it is attracted by the magnet post 35 inside, thereby fixing the position of the connecting post 32. At this time, the side of the support rod 4 near the connecting post 32 is lower than the side away from the connecting post 32, so the spool will slide towards the connecting post 32, thereby further reducing the spool from sliding off the end of the support rod 4 away from the connecting post 32.

[0029] like Figure 1 and Figure 11As shown, the rotating rod 3 has a mounting groove 37 on its surface; a fixed rod 38 is fixedly connected inside the mounting groove 37; a pair of rotating plates 39 are rotatably connected to the surface of the fixed rod 38; a threaded rod 40 is rotatably connected to the end face of the fixed rod 38, and the threaded rod 40 is rotatably connected to the rotating rod 3; a sleeve 41 is threadedly connected to the surface of the threaded rod 40; a pair of rotating plates 42 are rotatably connected to the surface of the sleeve 41; a stop plate 43 is rotatably connected between the pair of rotating plates 39 and rotating plates 42; during operation, when the inner diameter of the winding spool to be driven by the rotating rod 3 is large, the user can screw the threaded rod 40, which drives the sleeve 41 on its surface to move towards the fixed rod 38, thereby causing the rotating plates 39 and rotating plates 42 to rotate simultaneously, thus lifting the stop plate 43, and finally pressing the stop plate 43 against the inner wall of the spool, thereby fixing the spool on the rotating rod 3, thereby improving the applicability of this embodiment of the invention.

[0030] like Figure 12 As shown, a method for measuring the length of wires and cables is provided. This method uses any of the wire and cable length measuring devices described above, and the steps of this method are as follows: S1. First, the user pulls the end of the wire to be measured from the spool. Then, the user adjusts the distance between the upper pressure roller 7 and the lower pressure roller 9 by using the double thread screw 13 to fit the wire. After that, the user manually pulls the end of the wire through the laser length measuring instrument 10 and the upper pressure roller 7 and the lower pressure roller 9 on the other side. During this period, the laser length measuring instrument 10 will measure the section of wire that is manually pulled out. S2. After the cable end of the wire to be tested is pulled to the rotating rod 3, the user needs to install the spool without the wire or cable wrapped around it on the surface of the rotating rod 3, and then the user fixes the end of the wire to be tested on the surface of the spool without the wire or cable wrapped around it. S3. After the end of the wire to be tested is fixed on the surface of the spool without the wire, the servo motor can drive the spool to rotate through the rotating rod 3, thereby continuously pulling the wire on the other side, so that the wire continuously passes through the laser length measuring instrument 10. When the entire wire has passed through the laser length measuring instrument 10, the laser length measuring instrument 10 will display the complete length of the wire.

[0031] When the S1 wire and cable passes through the laser length measuring instrument 10, the laser inside the laser length measuring instrument 10 emits a laser beam with a stable frequency and excellent monochromaticity. After passing through the optical lens group, the laser beam is shaped into a small-diameter, energy-concentrated measuring spot, which is precisely focused on the surface of the wire and cable. Then, the photodetector receives the laser beam scattered back from the surface of the wire and cable. Due to the Doppler effect, the frequency of the scattered laser beam changes, and the amount of frequency change is related to the moving speed of the wire and cable. After analysis and processing by the signal processor and microprocessor, the moving speed of the wire and cable is obtained. Then, the moving speed of the wire and cable is integrated over time to finally obtain the length of the wire and cable.

[0032] During operation, after a section of the wire or cable on the spool has been used, in order to determine the remaining length of the wire or cable on the spool for later use, this embodiment of the invention can be used. The user first needs to install the wire or cable to be measured and its spool on the surface of the support rod 4. Then, the user pulls the wire or cable from the surface of the spool and pulls the wire or cable through the two pairs of upper pressure rollers 7 and lower pressure rollers 9. During this process, the laser length measuring instrument 10 emits a laser beam in the direction of the two connecting rods 6 through a laser. After passing through the optical lens group, the laser beam is shaped into a small-diameter and energy-concentrated measuring spot and illuminates the wire or cable to be measured. On the surface of the cable, due to the speed generated during the pulling of the cable, according to the Doppler effect, this changes the frequency of the light scattered from the measurement spot. The difference between this frequency and the original frequency is positively correlated with the speed of the cable. Therefore, when the optical detector detects the frequency of the light scattered from the measurement spot, it converts it into an electrical signal and transmits it to the signal processor and microprocessor. The signal processor then extracts the unique key information representing speed—the Doppler frequency—from the original weak electrical signal mixed with a large amount of noise, converts it into a digital signal, and transmits it to the microprocessor. The microprocessor then uses the Doppler frequency (LDV) to determine the speed. The formula calculates the data and obtains the final moving speed of the wire and cable. Then, it integrates the speed over time to obtain the length of the wire and cable. The user then pulls the wire and cable to the rotating rod 3. The user needs to install an empty spool onto the rotating rod 3. The user then fixes the pulled-out wire and cable onto the surface of the empty spool. The servo motor then drives the rotating rod 3 to rotate, which in turn drives the empty spool to rotate, ultimately winding the wire and cable around its surface. The rotation of the rotating rod 3 then allows for continuous pulling of the wire and cable, causing it to continuously pass through the laser length measuring instrument 10 and emit laser beams. The laser beam illuminates the area of ​​the wire and cable, thus completing the length measurement of the entire wire and cable. The length measurement principle is: by using the Doppler effect generated by the laser irradiating the moving wire and cable, the length of the wire and cable is calculated. This avoids the problem of slippage between the measuring wheel and the wire and cable when measuring with a wheel-type meter, thus ensuring the final measurement accuracy. At the same time, the support rod 4 and the rotating rod 3 on both sides of the support frame 1 provide support for the wire and cable to be measured and its spool, while the rotating rod 3 on the other side can wind and store the measured wire and cable. This not only facilitates the measurement of the wire and cable length, but also completes the storage of the wire and cable, thus facilitating subsequent warehousing.

[0033] When it is necessary to measure wires and cables of different diameters, the user needs to screw on the double-threaded screw 13. The double-threaded screw 13 drives the slide plate 11 and the connecting frame 12 to move away from or towards each other. The slide plate 11 and the connecting frame 12, in turn, drive the connecting rod 6 and the connecting arm 8 connected to them to move closer or further away from each other. This, in turn, drives the upper pressure roller 7 and the lower pressure roller 9 to move closer or further away from each other, thereby adjusting the distance between the upper pressure roller 7 and the lower pressure roller 9 to accommodate wires and cables of different diameters. It also ensures that the upper pressure roller 7 and the lower pressure roller 9 located between the two pairs of upper pressure rollers 7 and lower pressure roller 9 are set in a straight line, thereby ensuring the measurement accuracy of the laser meter and improving the applicability of the embodiment of the present invention.

[0034] When a user pulls a wire or cable between the pair of upper pressure rollers 7 and lower pressure rollers 9, to facilitate passing the wire or cable between them, the user needs to insert their finger through the through hole 18 and then pull down the pull plate 17. The pull plate 17 pulls the connecting plate 16 down together, which in turn drives the sliding column 15 to press down on the inner wall of the slide groove 14. This causes the two connecting arms 8 to rotate in a direction away from each other and squeeze the spring piece 19. At this time, the distance between the upper pressure rollers 7 and lower pressure rollers 9 will increase, making it easier for the user to pass the wire or cable between them. After the wire or cable has passed through them, the user releases the pull rod, the squeezed spring piece 19 returns to its original position, and pushes the two connecting arms 8 to rotate in opposite directions. This allows the upper pressure rollers 7 and lower pressure rollers 9 to squeeze the wire or cable again, thus limiting the wire or cable. This not only makes it easy for the user to pass the wire or cable between the pair of upper pressure rollers 7 and lower pressure rollers 9, but also ensures that the upper pressure rollers 7 and lower pressure rollers 9 clamp and limit the wire or cable.

[0035] To facilitate the user's installation of the spool on the support rod 4 and the rotating rod 3, the user can start the servo motor 2. One of the gears 20 rotates, and then the two gears 20 drive the two support arms 2 to rotate synchronously in opposite directions. This allows the support rod 4 and the rotating rod 3 to be rotated to a lower position, making it easier for the user to install the spool on the rotating rod 3 and the support rod 4. Subsequently, the user can control the two gears 20 again to drive the support arm 2 to rotate, which will then move the rotating rod 3 and the rotating rod 4 to a higher position, thus preventing the spool from rubbing against the ground during rotation.

[0036] When different diameter spools need to be installed, in order to avoid collision or friction between the spools and the support arm 2, the user can drive the drive rod 26 to rotate via the servo motor 3. The drive rod 26 then drives the two rotating columns 25 to rotate synchronously via the chain. Then, the two transmission rods 24 will drive the two transmission rods 24 to rotate via the chain. Finally, the transmission rods 24 drive the gear 23 to rotate. Since the gear 23 meshes with the slide rod 22, the slide rod 22 will slide in the receiving groove 21 under the drive of the gear 23, thereby adjusting the distance between the rotating rod 3 and the support rod 4 and the support frame 1, thus adapting to spools of different sizes.

[0037] After the wire and cable to be measured and its spool are fitted onto the support rod 4, the user can rotate the adjusting rod 28. The adjusting rod 28 drives the gear 30 to rotate, which in turn drives the baffle 29 meshing with the gear 30 to rotate. This causes the baffle 29 to extend out of the end face of the support rod 4, thus restricting the spool and preventing it from slipping directly off the surface of the support rod 4 during rotation. At the same time, the spring 31 presses the gear 30 tightly against the end face of the support rod 4, thereby increasing the maximum static friction between the gear 30 and the end face of the support rod 4. When the user rotates the gear 30 to a suitable angle, the friction between the gear 30 and the end face of the support rod 4 can fix the gear 30, preventing it from rotating arbitrarily. This also fixes the two baffles 29, preventing them from rotating arbitrarily and causing the spool to slip off the surface of the support rod 4.

[0038] After the spool is fitted onto the support rod 4, the user can pull the handle 36 to pull the insertion rod 33 out of the insertion hole 34. At this time, the connecting post 32 can rotate on the end face of the slide rod 22, thereby causing the support rod 4 on the surface of the connecting post 32 to rotate as well, so that the insertion rod 33 is aligned with the next pair of insertion holes 34. Then, the user inserts the insertion rod 33 into the pair of insertion holes 34 through the handle 36, and it is attracted by the magnet post 35 inside, thereby fixing the position of the connecting post 32. At this time, the side of the support rod 4 near the connecting post 32 is lower than the side away from the connecting post 32, so the spool will slide towards the connecting post 32, thereby further reducing the chance of the spool slipping off the end of the support rod 4 away from the connecting post 32.

[0039] When the inner diameter of the winding spool to be driven by the rotating rod 3 is large, the user can screw the threaded rod 40, which will drive the sleeve 41 on its surface to move towards the fixed rod 38, thereby causing the rotating plate 39 and the rotating plate 42 to rotate simultaneously, thereby lifting the abutment plate 43 and finally pressing the abutment plate 43 against the inner wall of the spool, thus fixing the spool on the rotating rod 3, thereby improving the applicability of the embodiment of the present invention.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the length of electric wires and cables, characterized in that: The system includes a support frame; support arms are rotatably connected to both sides of the support frame near the top; a rotating rod and a support rod are respectively installed at the ends of the two support arms away from the support frame, and the rotating rod is driven by a servo motor; a support plate is fixedly connected to one side of the top surface of the support frame; a pair of symmetrically arranged connecting rods are installed on one side of the support plate; upper pressure rollers are rotatably connected to the surfaces of the connecting rods; a pair of connecting arms are installed on the top surface of the support frame at the corresponding positions of the connecting rods; lower pressure rollers are rotatably connected to the tops of the two connecting arms; a laser length measuring instrument is installed on the side of the support plate near the connecting rods; the laser length measuring instrument includes a laser, an optical lens group, a photodetector, a signal processor, and a microprocessor.

2. The cable length measuring device according to claim 1, for measuring cable length, characterized in that: A sliding plate is fixedly connected between the two connecting rods, and the sliding plate is slidably connected to the support plate; a connecting frame is rotatably connected to the bottom of the two connecting arms; the connecting frame is slidably connected to the support plate; and a double-threaded screw is threadedly connected between the sliding plate and the connecting frame.

3. A wire and cable length measuring device according to claim 2, for measuring cable length, characterized in that: Each of the two connecting arms has a sliding groove on the side away from the support plate; a sliding column is slidably connected in each of the two sliding grooves; a connecting plate is fixedly connected to one end of each of the two sliding columns; a pull plate is fixedly connected to the bottom surface of the middle part of the connecting plate, and the pull plate is slidably connected to the support frame; a through hole is opened at the bottom of the pull plate; and a spring piece is fixedly connected between each of the two connecting arms and the support frame.

4. A wire and cable length measuring device according to claim 3, for measuring cable length, characterized in that: The support frame is internally rotatably connected to a pair of gears, one of which is driven by a servo motor; the two gears are respectively meshed with the support arms on both sides.

5. A wire and cable length measuring device according to claim 4, for measuring cable length, characterized in that: Each support arm has a receiving groove at the end away from gear one; a sliding rod is slidably connected in the receiving groove; gear two is rotatably connected near the groove opening of the receiving groove, and gear two meshes with the sliding rod; a transmission rod is rotatably connected to the side of the support arm away from the rotating rod, and the transmission rod is fixedly connected to gear two; a rotating column is rotatably connected at the rotatable connection between the support frame and the support arm, and the rotating column is connected to the transmission rod by a chain; a drive rod is rotatably connected between the two transmission rods of the support frame, and the drive rod is driven by servo motor three; the drive rod is connected to the two rotating columns by a chain.

6. A wire and cable length measuring device according to claim 5, for measuring cable length, characterized in that: The support rod has a rotating groove at the end away from the support arm; an adjusting rod is rotatably connected in the rotating groove; a pair of baffles are rotatably connected at the end of the support rod away from the support arm; a gear three is slidably connected to the support rod near the opening of the rotating groove, and the gear three meshes with the two baffles; a spring is fixed between the gear three and the bottom of the rotating groove, and the diameter of the gear three is larger than the diameter of the opening of the rotating groove.

7. A wire and cable length measuring device according to claim 6, for measuring cable length, characterized in that: The support rod is fixedly connected to a connecting column at one end near the support arm, and the connecting column is rotatably connected to a sliding rod on its side; a plug rod is slidably connected to the end face of the connecting column, and the plug rod passes through the connecting column; the sliding rod near the connecting column has two pairs of insertion holes at the end near the insertion rod, and the insertion holes are all adapted to the insertion rod; a magnetic column is fixedly connected to the bottom of the insertion hole, and the insertion rod is made of magnetizable metal; the ends of the two insertion rods away from the insertion holes are fixedly connected to a handle.

8. A wire and cable length measuring device according to claim 7, for measuring cable length, characterized in that: The rotating rod has an installation groove on its surface; a fixed rod is fixedly connected inside the installation groove; a pair of rotating plates are rotatably connected to the surface of the fixed rod; a threaded rod is rotatably connected to the end face of the fixed rod, and the threaded rod is rotatably connected to the rotating rod; a sleeve is threadedly connected to the surface of the threaded rod; a pair of rotating plates are rotatably connected to the surface of the sleeve; a stop plate is rotatably connected between the pair of rotating plates.

9. A method for measuring the length of electric wires and cables, wherein the method uses an electric wire and cable length measuring device as described in any one of claims 1-8 to measure the length of the cable, characterized in that: The steps of this method are as follows: S1. First, the user pulls the end of the wire to be measured from the spool, then adjusts the distance between the upper and lower pressure rollers using the double-threaded screw to fit the wire. After that, the user manually pulls the end of the wire through the laser length measuring instrument and the upper and lower pressure rollers on the other side. During this time, the laser length measuring instrument will measure the manually pulled section of wire. S2. After the end of the wire to be tested is pulled to the rotating rod, the user needs to install the spool without the wire to be tested on the surface of the rotating rod, and then the user fixes the end of the wire to be tested on the surface of the spool. S3. After the end of the wire to be tested is fixed on the surface of the spool without the wire wrapped around it, the servo motor drives the spool to rotate through the rotating rod, thereby continuously pulling the wire on the other side, so that the wire continuously passes through the laser length measuring instrument. When the entire wire has passed through the laser length measuring instrument, the laser length measuring instrument will display the complete length of the wire.

10. A method for measuring the length of wires and cables according to claim 9, characterized in that: When the S1 wire and cable passes through the laser length measuring instrument, the laser inside the instrument emits a laser beam with a stable frequency and excellent monochromaticity. After passing through the optical lens group, this laser beam is shaped into a small-diameter, energy-concentrated measuring spot, which is precisely focused on the surface of the wire and cable. Then, the photodetector receives the laser beam scattered back from the surface of the wire and cable. Due to the Doppler effect, the frequency of the scattered laser beam changes, and the amount of frequency change is related to the moving speed of the wire and cable. After analysis and processing by the signal processor and microprocessor, the moving speed of the wire and cable is obtained. Then, the moving speed of the wire and cable is integrated over time to finally obtain the length of the wire and cable.

Images