High-precision meter counting device for digital cable

Abstract

The invention discloses a digital cable high-precision meter counting device, which relates to the field of cable meter counting and comprises a meter counting frame, a meter counting guide wheel rotationally arranged on the meter counting frame, an encoder mounted on a measuring shaft of the meter counting guide wheel, a gravity guide wheel movably arranged on the meter counting frame, and an adjustable conveying space arranged between the gravity guide wheel and the meter counting guide wheel. The digital cable penetrates through the conveying space, a friction transmission pair is formed between the digital cable and the meter counting guide wheel under the action of the gravity guide wheel, and a precision detection mechanism is arranged on the meter counting frame and comprises a marking assembly, an identification sensor and a timer. The marking assembly and the recognition sensor are arranged at the two ends of the meter counting guide wheel in the conveying direction of the digital cable, the marking assembly is used for drawing a detection line on the digital cable, the recognition sensor is used for detecting the detection line on the digital cable, the timer conducts timing when drawing the detection line, and timing is finished when the recognition sensor recognizes the detection line. And the meter counting accuracy and reliability are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of length measurement, and particularly to a high-precision length measurement device for digital cables. Background Art

[0002] Under the background of the rapid development of communication technology and data transmission technology, digital cables, as the core carriers of information transmission, are increasingly widely used in many fields such as communication networks, data centers, and intelligent buildings. As mentioned in "Research on Key Technologies of Length Measurement in the Production Process of Digital Cables", the accurate length measurement of digital cables plays a crucial role in their production, processing, and use. This is not only related to the quality of the products, but also closely linked to the accuracy of engineering cost accounting and the efficient control of construction progress. Currently, most of the common digital cable length measurement devices on the market adopt a roller structure. The principle is to drive the roller to rotate by the friction between the roller and the digital cable, and then rely on the encoder to record the number of rotations of the roller, and further calculate the length of the digital cable. However, a large number of studies have shown that there are many drawbacks in this traditional length measurement method. "Error Analysis and Improvement Strategies of Roller-Type Digital Cable Length Measurement Devices" clearly points out that the friction between the digital cable and the roller is affected by many factors and is extremely unstable. Among them, the magnitude of the pressure applied to the digital cable is a key influencing factor. When the pressure is too large, as found in "Experimental Study on the Influence of Physical Characteristics of Digital Cables on Length Measurement Accuracy", the digital cable will undergo obvious deformation, and its cross-sectional shape changes, resulting in a deviation between the actual circumference and the theoretically calculated circumference when the roller rolls, thus seriously affecting the length measurement accuracy; when the pressure is too small, insufficient friction cannot be formed between the digital cable and the roller, easily causing the phenomenon of cable slipping, which also makes the length measurement result inaccurate. Therefore, how to experimentally obtain an accurate length measurement conveying pressure has become a key problem restricting the development of length measurement technology. Currently, relevant experiments mostly adopt an empirical trial-and-error method, that is, under different working conditions, manually adjust the pressure and record the length measurement results, and try to find a suitable pressure value through a large number of repetitive tests. This method not only has low efficiency, consumes a large amount of time and labor costs, but also, due to the lack of systematic parameter control and data analysis, it is difficult to accurately grasp the internal relationship between pressure and length measurement accuracy. At the same time, digital cables of different specifications and materials have significant differences in pressure sensitivity. The existing experimental methods cannot conduct accurate pressure tests and optimizations for diverse digital cable products, resulting in difficulty in obtaining high-precision conveying pressures applicable to different digital cables, making it difficult for the length measurement device to reach the ideal accuracy level in actual applications. Furthermore, existing length measurement devices generally lack an effective accuracy detection and compensation mechanism, and it is difficult to detect and correct length measurement deviations caused by factors such as equipment wear and installation errors, resulting in a continuous increase in cumulative errors, and simply unable to meet the stringent requirements of high-precision length measurement. Summary of the Invention

[0003] The object of the present invention is to overcome the deficiencies of the prior art and provide a high-precision digital cable length measuring device to solve the deficiencies of the prior art.

[0004] The object of the present invention is achieved by the following technical solutions: A high-precision digital cable length measuring device includes a length measuring frame. A length measuring guide wheel is rotatably arranged on the length measuring frame. An encoder is installed on the measuring shaft of the length measuring guide wheel. A gravity guide wheel is movably arranged on the length measuring frame. An adjustable conveying space is provided between the gravity guide wheel and the length measuring guide wheel. The digital cable passes through the conveying space. Under the action of the gravity guide wheel, a friction transmission pair is formed between the digital cable and the length measuring guide wheel. A precision detection mechanism is arranged on the length measuring frame. The precision detection mechanism includes a marking component, an identification sensor, and a timer. The marking component and the identification sensor are arranged at both ends of the length measuring guide wheel along the conveying direction of the digital cable. The marking component is used to draw a detection line on the digital cable. The identification sensor is used to detect the detection line on the digital cable. The timer starts timing when the detection line is drawn and ends timing when the identification sensor recognizes the detection line.

[0005] Further, the marking component includes a positioning ring and a marking ring. Two positioning rings are arranged at intervals along the conveying direction of the digital cable. The marking ring is coaxially arranged between the two positioning rings. The digital cable passes through the positioning ring and the marking ring. A plurality of sliding rods are inserted through the marking ring. The plurality of sliding rods are arranged at intervals along the circumferential direction of the marking ring. The sliding rods move towards the center of the marking ring. A marking pen is arranged at one end of the sliding rod close to the center of the marking ring.

[0006] Further, a spring disc is fixedly sleeved on the sliding rod. The spring disc is located inside the marking ring. A spring is sleeved on the sliding rod. One end of the spring is connected to the spring disc, and the other end is connected to the inner ring of the marking ring. The marking component further includes a driving ring. The driving ring is rotatably sleeved on the marking ring. A plurality of arc-shaped protrusions are fixed on the outer wall of the driving ring. Each sliding rod corresponds to one arc-shaped protrusion. A through hole is opened on the sliding rod. The driving ring passes through the through hole. Different positions of the arc-shaped protrusion contact the inner wall of the through hole to drive the sliding rod to move towards the center of the marking ring.

[0007] Further, an installation part is coaxially fixed to the marking ring. The installation part is fixedly connected to the length measuring frame. An arc-shaped tooth is fixed on the outer ring of the marking ring. The arc-shaped tooth meshes with a rack. A driving cylinder is installed on the length measuring frame. The telescopic shaft of the driving cylinder is connected to one end of the rack.

[0008] Further, a pressing shaft is coaxially fixed to the gravity guide wheel. One end of the pressing shaft away from the gravity guide wheel is rotatably connected to a swing arm. A gravity main shaft is fixed to the swing arm. The gravity main shaft is rotatably connected to a length measuring frame through a bearing. A pushing cylinder is arranged on the length measuring frame. The cylinder body of the pushing cylinder is hinged to the length measuring frame, and the telescopic shaft of the pushing cylinder is hinged to the swing arm.

[0009] Further, a measuring window is opened on the length measuring frame. The measuring window penetrates along a direction perpendicular to the conveying direction of the digital cable. A measuring block is arranged in the measuring window. The measuring shaft rotatably penetrates through the measuring block. A guide rod is fixed to the top of the measuring block. A guide hole is opened on the inner top wall of the measuring window. The guide rod is slidably fitted in the guide hole. A radial pressure sensor is installed on the inner bottom wall of the measuring window. The pressure shaft of the radial pressure sensor contacts the measuring block. A counterweight wheel is fixedly sleeved on one end of the measuring shaft away from the length measuring guide wheel. The counterweight wheel and the length measuring guide wheel are distributed at both ends of the measuring block.

[0010] Further, the length measuring guide wheel includes a measuring disc, a rubber wheel and a pressing ring. Rectangular notches are opened in the middle of both the measuring disc and the rubber wheel. A driving body is fixed to one end of the measuring shaft away from the counterweight wheel. The driving body is in the shape of a cuboid. The measuring disc and the rubber wheel are sequentially sleeved on the driving body, and the rectangular notches are adapted to the driving body. An annular groove is opened on the outer ring of the rubber wheel. The cross section of the annular groove is U-shaped. The digital cable passes through the annular groove. The pressing ring presses the rubber wheel against the measuring disc and squeezes the annular groove. An axial pressure sensor is installed on the length measuring frame. The pressure shaft of the axial pressure sensor contacts the measuring disc.

[0011] Further, a compensation frame is fixed to the length measuring frame. A compensation cylinder is installed on the compensation frame. The telescopic direction of the compensation cylinder is collinear with the axial direction of the measuring shaft. The inner ring of a compensation bearing is fixedly connected to the telescopic shaft of the compensation cylinder. The pressing ring is fixedly sleeved on the outer ring of the compensation bearing.

[0012] Further, a length measuring main shaft is rotatably installed on the length measuring frame. A driving pulley is sleeved on the length measuring main shaft. A driven pulley is sleeved on the measuring shaft. The driven pulley is connected to the driving pulley through a synchronous belt. A motor is installed on the length measuring frame. The output shaft of the motor is drivingly connected to the length measuring main shaft.

[0013] Furthermore, locking shaft assemblies are provided on both sides of the metering main shaft in the axial direction. The locking shaft assembly includes a locking frame and an arc-shaped friction plate. A driving hole is provided at one end of the locking frame close to the metering main shaft. A driving locking shaft is slidably arranged in the driving hole. The driving locking shaft is connected to the arc-shaped friction plate. An electromagnet is installed in the driving hole. A permanent magnet is fixed at one end of the driving locking shaft away from the arc-shaped friction plate. A locking shaft spring is installed in the driving hole. Two ends of the locking shaft spring are respectively connected to the locking frame and the driving locking shaft. When the electromagnet is energized, it generates a magnetic pole with the same magnetism as the permanent magnet.

[0014] The beneficial effects of the present invention are as follows: 1. First, the optimal metering pressure of the digital cable is obtained through experiments. The digital cable is conveyed between the metering guide wheel and the gravity guide wheel. A detection line is drawn on the digital cable through the marking assembly. At this time, the timer starts timing and stops when the recognition sensor recognizes the detection line. The theoretical conveying length of the digital cable is obtained by combining the detection time of the timer with the conveying speed of the metering guide wheel. The theoretical conveying length is compared with the actual conveying length recorded by the encoder. If the comparison result is within the allowable error range, this pressure is set as the metering conveying pressure of the digital cable. If the comparison result exceeds the error range, the pressure of the gravity guide wheel on the digital cable is adjusted and the experiment is repeated until the comparison result falls within the allowable error range. This effectively improves the accuracy and reliability of metering. At the same time, during the metering process, the precision detection mechanism periodically detects the metering accuracy of the digital cable, timely discovers the errors existing in the metering process, and provides data support for subsequent error correction.

[0015] 2. The digital cable is conveyed by locally covering the annular groove of the rubber wheel, so that the friction force received by the digital cable is uniform, which can effectively avoid the problem of the digital cable slipping during conveying, has a good conveying effect, and makes the metering accuracy higher.

[0016] 3. The radial pressure sensor real-time detects the pressure of the gravity guide wheel on the digital cable, and then compensates the radial pressure on the digital cable through the movement compensation of the gravity guide wheel. The axial pressure sensor real-time detects the pressure between the digital cable and the rubber cable, and then compensates the axial pressure on the digital cable through the movement compensation of the pressure ring. The factors affecting the conveying friction force of the digital cable are fully considered, so as to adjust and compensate in real time during the metering process, keep the metering accuracy within the set range all the time, and effectively improve the accuracy and reliability of metering. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a high-precision metering device for a digital cable of the present invention Figure 1 ; Figure 2 is a schematic structural diagram of a high-precision metering device for a digital cable of the present invention Figure 2 ; Figure 3For Figure 2 Enlarged view of location A in Figure 4 Structural schematic of a high-precision digital cable length measuring device of the present invention Figure 3 ; Figure 5 For Figure 4 Enlarged view of location B in Figure 6 Structural schematic of a high-precision digital cable length measuring device of the present invention Figure 4 ; Figure 7 For Figure 6 Enlarged view of location C in Figure 8 Structural schematic of a high-precision digital cable length measuring device of the present invention Figure 5 ; Figure 9 Internal structural schematic of the lock frame in a high-precision digital cable length measuring device of the present invention; In the figure, 1 - length measuring frame, 2 - length measuring guide wheel, 3 - measuring shaft, 4 - encoder, 5 - gravity guide wheel, 6 - identification sensor, 7 - timer, 8 - positioning ring, 9 - marking ring, 10 - sliding rod, 11 - marking pen, 12 - spring plate, 13 - spring, 14 - driving ring, 15 - arc-shaped protrusion, 16 - through hole, 17 - mounting part, 18 - arc-shaped teeth, 19 - rack, 20 - driving cylinder, 21 - pressing shaft, 22 - swing arm, 23 - gravity main shaft, 24 - pushing cylinder, 25 - measuring window, 26 - measuring block, 27 - guide rod, 28 - radial pressure sensor, 29 - counterweight wheel, 30 - measuring disc, 31 - rubber wheel, 32 - pressing ring, 33 - driving body, 34 - annular groove, 35 - axial pressure sensor, 36 - compensation frame, 37 - compensation cylinder, 38 - compensation bearing, 39 - length measuring main shaft, 40 - driving pulley, 41 - driven pulley, 42 - synchronous belt, 43 - motor, 44 - lock frame, 45 - arc-shaped friction plate, 46 - driving hole, 47 - driving lock shaft, 48 - electromagnet, 49 - permanent magnet, 50 - lock shaft spring. Detailed implementation mode

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0019] Embodiment 1 As Figures 1 to 9As shown in the figure, a high-precision digital cable length measuring device includes a length measuring frame 1. A length measuring guide wheel 2 is rotatably arranged on the length measuring frame 1. An encoder 4 is installed on the measuring shaft 3 of the length measuring guide wheel 2. A gravity guide wheel 5 is movably arranged on the length measuring frame 1. An adjustable conveying space is provided between the gravity guide wheel 5 and the length measuring guide wheel 2. The digital cable passes through the conveying space. Under the action of the gravity guide wheel 5, a friction transmission pair is formed between the digital cable and the length measuring guide wheel 2. A precision detection mechanism is arranged on the length measuring frame 1. The precision detection mechanism includes a marking component, an identification sensor 6 and a timer 7. The marking component and the identification sensor 6 are arranged at both ends of the length measuring guide wheel 2 along the conveying direction of the digital cable. The marking component is used to draw a detection line on the digital cable. The identification sensor 6 is used to detect the detection line on the digital cable. The timer 7 starts timing when the detection line is drawn. When the identification sensor 6 recognizes the detection line, the timing ends. The unreeled digital cable passes through the conveying space. The length-measured digital cable is wound up by a winding frame. The digital cable is squeezed between the gravity guide wheel 5 and the length measuring guide wheel 2, so that a frictional force is generated between the digital cable and the length measuring guide wheel 2. Through this frictional force, the digital cable moves together with the length measuring guide wheel 2 to complete the conveying and length measurement. By adjusting the pressure of the gravity guide wheel 5 on the digital cable, the frictional force between the digital cable and the length measuring guide wheel 2 is adjusted to adapt to the length measurement of different types of cables. Through the precision detection mechanism, the length measurement conveying pressure of different digital cables can be measured, so that the digital cable completes the length measurement operation under the corresponding conveying pressure, improving the accuracy of length measurement. Specifically, the digital cable is conveyed between the length measuring guide wheel 2 and the gravity guide wheel 5. The marking component draws a detection line on the digital cable. At the same time, the timer 7 starts timing. The timer 7 stops timing when the identification sensor 6 recognizes the detection line. The theoretical conveying length of the digital cable is obtained by combining the detection time of the timer and the conveying speed of the length measuring guide wheel 2. The theoretical conveying length is compared with the actual conveying length recorded by the encoder 4. If the comparison result is within the allowable error range, this pressure is set as the length measurement conveying pressure of the digital cable. If the comparison result exceeds the error range, the pressure of the gravity guide wheel 5 on the digital cable is adjusted and the test is repeated until the comparison result falls within the allowable error range and the test stops. Subsequently, the same type of digital cable adopts this conveying pressure for length measurement operation, thus effectively improving the accuracy and reliability of length measurement, being able to adapt to the precise length measurement of different cables. At the same time, during the length measurement process, the precision detection mechanism regularly detects the length measurement precision of the digital cable, timely discovers the errors existing in the length measurement process, and provides data support for subsequent error correction.

[0020] Embodiment 2 On the basis of Embodiment 1, a metering main shaft 39 is rotatably installed on the metering frame 1. A driving pulley 40 is sleeved on the metering main shaft 39, and a driven pulley 41 is sleeved on the measuring shaft 3. The driven pulley 41 is drivingly connected to the driving pulley 40 through a synchronous belt 42. A motor 43 is installed on the metering frame 1. The output shaft of the motor 43 is drivingly connected to the metering main shaft 39. The motor 43 drives the driving pulley 40 to rotate. The driving pulley 40 drives the driven pulley 41 to rotate through the synchronous belt 42. The driven pulley 41 drives the metering main shaft 39 to rotate. The digital cable is driven to be conveyed forward by the frictional force between the metering main shaft 39 and the digital cable. The number of rotations of the metering main shaft 39 is recorded by an encoder 4, thereby reflecting the metering length of the digital cable.

[0021] Embodiment 3 Since the motor 43 will continue to drive the driving pulley 40 to rotate due to inertia when it stops, the final position of the digital cable metering will continue to be conveyed forward for a certain distance, resulting in the cutting length of the final digital cable exceeding the metering length. Therefore, on the basis of Embodiment 2, as Figures 1 to 9 shown, locking shaft assemblies are arranged on both axial sides of the metering main shaft 39. The locking shaft assembly includes a locking frame 44 and an arc friction plate 45. A driving hole 46 is opened at one end of the locking frame 44 close to the metering main shaft 39. A driving locking shaft 47 is slidably arranged in the driving hole 46. The driving locking shaft 47 is connected to the arc friction plate 45. An electromagnet 48 is installed in the driving hole 46. A permanent magnet 49 is fixed at one end of the driving locking shaft 47 away from the arc friction plate 45. A locking shaft spring 50 is installed in the driving hole 46. Both ends of the locking shaft spring 50 are respectively connected to the locking frame 44 and the driving locking shaft 47. When the electromagnet 48 is energized to generate a magnetic pole with the same magnetism as the permanent magnet 49, when the locking shaft spring 50 is in a normal state, the arc friction plate 45 is separated from the metering main shaft 39. When the metering is completed, the electromagnet 48 is energized to repel the permanent magnet 49, so that the driving locking shaft 47 drives the arc friction plate 45 to move close to the metering main shaft 39, and the arc friction plates 45 in the two locking shaft assemblies clamp the metering main shaft 39, so that the metering main shaft 39 can stop rotating quickly, greatly reducing the difference between the length of the cut digital cable and the metering length of the digital cable, and improving the metering accuracy.

[0022] Embodiment 4 On the basis of Embodiment 3, as Figures 1 to 7As shown, the marking component includes a positioning ring 8 and a marking ring 9. Two positioning rings 8 are arranged at intervals along the conveying direction of the digital cable. The marking ring 9 is coaxially arranged between the two positioning rings 8. The digital cable passes through the positioning ring 8 and the marking ring 9. A plurality of sliding rods 10 are inserted through the marking ring 9. The plurality of sliding rods 10 are arranged at intervals along the circumferential direction of the marking ring 9. The sliding rods 10 move towards the center of the marking ring 9. A marking pen 11 is arranged at one end of the sliding rod 10 close to the center of the marking ring 9. The movement of the sliding rod 10 drives the marking pen 11 to move closer to the digital cable, so that the marking pen 11 draws detection points on the digital cable. Since the cable is in a conveying state, in order not to affect the conveying of the cable, detection points are formed on the digital cable by means of punctuation. Through the simultaneous movement of a plurality of marking pens 11, a plurality of continuous or approximately continuous detection points are formed on the digital cable, so that the detection points form a detection line for the identification sensor 6 to identify. The detection points marked in this way can be arranged around the circumference of the digital cable, avoiding the spiral arrangement of a plurality of detection points under the conveying of the digital cable and affecting the identification action of the identification sensor 6. Specifically, in implementation, the identification sensor 6 adopts a color sensor, and the marking pen 11 adopts a color different from that of the digital cable, so that the color of the marking pen 11 acting on the digital cable can be accurately identified by the color sensor.

[0023] Further, an installation groove is formed at one end of the sliding rod 10 where the marking pen 11 is arranged. One end of the marking pen 11 is inserted into the installation groove. A fastening screw is threadedly connected to the side wall of the sliding rod 10. The tail of the fastening screw penetrates into the installation groove and presses against the marking pen 11, so that the position of the marking pen 11 can be adjusted. For digital cables of different models, the position of the marking pen 11 is adjusted correspondingly, so that the marking pen 11 can smoothly draw detection points on the digital cable and will not squeeze the digital cable to affect the metering accuracy.

[0024] Embodiment 5 On the basis of Embodiment 4, as Figures 1 to 5As shown in the figure, a spring disc 12 is fixedly sleeved on the sliding rod 10. The spring disc 12 is located inside the inner ring of the marking ring 9. A spring 13 is sleeved on the sliding rod 10. One end of the spring 13 is connected to the spring disc 12, and the other end is connected to the inner ring of the marking ring 9. The marking assembly further includes a driving ring 14. The driving ring 14 is rotatably sleeved on the marking ring 9. A plurality of arc-shaped protruding parts 15 are fixed on the outer wall of the driving ring 14. Each sliding rod 10 corresponds to an arc-shaped protruding part 15. A through hole 16 is formed in the sliding rod 10. The driving ring 14 passes through the through hole 16. Different positions of the arc-shaped protruding part 15 contact the inner wall of the through hole 16, so as to drive the sliding rod 10 to move towards the center of the marking ring 9. The marking ring 9 is coaxially fixed with a mounting member 17. The mounting member 17 is fixedly connected to the meter counting frame 1. An arc-shaped tooth 18 is fixed on the outer ring of the marking ring 9. The arc-shaped tooth 18 meshes with a rack 19. A driving cylinder 20 is installed on the meter counting frame 1. The telescopic shaft of the driving cylinder 20 is connected to one end of the rack 19. An arc-shaped groove is formed in the outer wall of the marking ring 9. An arc-shaped slider is fixed on the inner wall of the driving ring 14. The arc-shaped slider is slidably fitted in the arc-shaped groove. Initially, the top of the arc-shaped protruding part 15 contacts the inner wall of the through hole 16, and the spring 13 is in a compressed state. When it is necessary to draw a detection line on the digital cable, the driving cylinder 20 drives the rack 19 to move, so that the rack 19 drives the driving ring 14 to deflect on the marking ring 9 through the arc-shaped tooth 18, so that the top of the arc-shaped protruding part 15 is separated from the inner wall of the through hole 16. At this time, the marking pen 11 moves towards the digital cable under the reaction force of the spring 13, so as to draw a detection point on the digital cable. After the driving cylinder 20 drives the rack 19 to move, it immediately resets, so that the arc-shaped protruding part 15 jacks up the sliding rod 10, so that the marking pen 11 is separated from the digital cable. The driving cylinder 20 makes a reciprocating movement, so that the marking pen 11 quickly contacts the digital cable and resets, so that the detection point can be smoothly drawn on the digital cable. Since each sliding rod 10 is correspondingly provided with an arc-shaped protruding part 15, and the contact mode between each sliding rod 10 and the arc-shaped protruding part 15 is the same, a plurality of marking pens 11 can be driven to move simultaneously, and the plurality of marking pens 11 are arranged along the circumferential direction of the digital cable to stably form a detection line for the identification sensor 6 to identify; the above operation requires the digital cable to pass through the marking ring 9 coaxially. For this reason, two positioning rings 8 are provided. The inner diameter of the positioning ring 8 matches the outer diameter of the digital cable, so that the digital cable passes through the positioning ring 8 for conveying, so as to guide the digital cable and make the digital cable pass through the marking ring 9 coaxially, so as to accurately draw the detection line.

[0025] Embodiment Six During the meter counting process, since a friction pair is formed between the digital cable and the meter counting guide wheel 2, wear will occur at the contact position between the meter counting guide wheel 2 and the digital cable, resulting in a decrease in the friction force between the digital cable and the meter counting guide wheel 2, so that the conveying pressure of the digital cable cannot reach the marking conveying pressure, and the friction force received by the digital cable is reduced, and the digital cable is prone to slipping, affecting the meter counting accuracy. For this reason, on the basis of Embodiment Five, as Figures 1 to 7As shown in the figure, a pressing shaft 21 is coaxially fixed to the gravity guide pulley 5. One end of the pressing shaft 21 away from the gravity guide pulley 5 is rotatably connected to a swing arm 22. A gravity main shaft 23 is fixed to the swing arm 22. The gravity main shaft 23 is rotatably connected to the length measuring frame 1 through a bearing. A pushing cylinder 24 is arranged on the length measuring frame 1. The cylinder body of the pushing cylinder 24 is hinged to the length measuring frame 1, and the telescopic shaft of the pushing cylinder 24 is hinged to the swing arm 22. By the telescopic movement of the pushing cylinder 24, the swing arm 22 is driven to deflect around the gravity main shaft 23, so that the gravity guide pulley 5 deflects closer to or away from the length measuring guide pulley 2, and the extrusion force on the digital cable is adjusted, which is equivalent to adjusting the normal pressure on the digital cable. By adjusting the normal pressure, the friction force between the digital cable and the length measuring guide pulley 2 is adjusted. A measuring window 25 is opened on the length measuring frame 1. The measuring window 25 is penetrated along the direction perpendicular to the conveying direction of the digital cable. A measuring block 26 is arranged in the measuring window 25. The measuring shaft 3 rotates through the measuring block 26. A guide rod 27 is fixed to the top of the measuring block 26. A guide hole is opened on the inner top wall of the measuring window 25. The guide rod 27 is slidably fitted in the guide hole. A radial pressure sensor 28 is installed on the inner bottom wall of the measuring window 25. The pressure shaft of the radial pressure sensor 28 contacts the measuring block 26. A counterweight wheel 29 is fixedly sleeved at one end of the measuring shaft 3 away from the length measuring guide pulley 2. The counterweight wheel 29 and the length measuring guide pulley 2 are distributed at both ends of the measuring block 26. When the conveying pressure of the digital cable is obtained through the test of the precision detection mechanism, the radial pressure sensor 28 will obtain the radial conveying pressure of the digital cable. Taking this radial conveying pressure as the standard radial conveying pressure, the measuring block 26 directly acts on the radial pressure sensor 28 through the cooperation of the guide rod 27 and the guide hole. The extrusion force of the gravity guide pulley 5 on the digital cable is transmitted to the radial pressure sensor 28 through the length measuring guide pulley 2 and the measuring block 26, so that the radial conveying pressure of the digital cable can be monitored in real time. When the contact position between the length measuring guide pulley 2 and the digital cable is gradually worn, the digital cable gradually separates from the gravity guide pulley 5, and the detection value of the radial pressure sensor 28 will decrease. At this time, the pushing cylinder 24 drives the swing arm 22 to deflect closer to the length measuring guide pulley 2, so that the gravity guide pulley 5 continues to extrude the digital cable. When the pressure value feedback by the radial pressure sensor 28 is equal to the standard radial conveying pressure, the pushing cylinder 24 stops running. Thus, the radial conveying pressure of the digital cable can be monitored in real time, and the radial conveying pressure can be adjusted in real time according to the monitoring value, improving the length measuring accuracy.

[0026] Embodiment Seven Based on Embodiment Six, as Figures 1 to 9As shown in the figure, the metering guide wheel 2 includes a measuring disc 30, a rubber wheel 31 and a pressing ring 32. Rectangular notches are provided in the middle of both the measuring disc 30 and the rubber wheel 31. One end of the measuring shaft 3 away from the counterweight wheel 29 is fixed with a driving body 33. The driving body 33 is in the shape of a cuboid. The measuring disc 30 and the rubber wheel 31 are sleeved on the driving body 33 in sequence, and the rectangular notches are adapted to the driving body 33. An annular groove 34 is provided on the outer ring of the rubber wheel 31. The cross-section of the annular groove 34 is U-shaped. The digital cable passes through the annular groove 34. The pressing ring 32 presses the rubber wheel 31 against the measuring disc 30 and squeezes the annular groove 34. An axial pressure sensor 35 is installed on the metering frame 1. The pressure shaft of the axial pressure sensor 35 contacts the measuring disc 30. A compensation frame 36 is fixed on the metering frame 1. A compensation cylinder 37 is installed on the compensation frame 36. The telescopic direction of the compensation cylinder 37 is collinear with the axial direction of the measuring shaft 3. The telescopic shaft of the compensation cylinder 37 is fixedly connected to the inner ring of a compensation bearing 38. The pressing ring 32 is fixedly sleeved on the outer ring of the compensation bearing 38. When the precision detection mechanism tests the conveying pressure of the digital cable, the axial pressure sensor 35 will obtain the axial conveying pressure of the digital cable. Taking this axial conveying pressure as the standard axial conveying pressure, due to the U-shaped design of the annular groove 34, the digital cable is in arc contact with the rubber wheel 31, having a large contact area. That is, both sides of the rubber wheel 31 contact the digital cable to form an axial pressure, and the digital cable contacts the bottom wall of the annular groove 34 to form a radial pressure, making the extrusion force received by the digital cable more uniform, and effectively avoiding the digital cable from slipping on the rubber wheel 31. This large-area contact causes wear on both side walls and the bottom wall of the annular groove 34 when the rubber wheel 31 wears. The wear of the bottom wall of the annular groove 34 affects the radial conveying pressure of the digital cable, and the wear of the side wall of the annular groove 34 affects the axial conveying pressure of the digital cable. The axial conveying pressure and the radial conveying pressure are superimposed to form the metering conveying pressure. Therefore, the metering conveying pressure is jointly affected by the axial conveying pressure and the radial conveying pressure. The radial conveying pressure is monitored in real time by the radial pressure sensor 28 and compensated in real time through the movement of the gravity guide wheel 5, while the axial conveying pressure is monitored in real time by the axial pressure sensor 35 and compensated in real time through the movement of the pressing ring 32. Specifically, the detection position of the axial pressure sensor 35 is at the same horizontal position as the side wall of the annular groove 34, and the position where the pressing ring 32 presses the rubber wheel 31 is at the side wall position of the annular groove 34, so as to be able to more accurately detect the axial pressure of the cable. At the same time, the pressing ring 32 can also stably press the rubber wheel 31, making the side wall of the annular groove 34 close to the digital cable. When the side wall of the annular groove 34 is worn, the extrusion force of the pressing ring 32 on the digital cable becomes smaller, the reaction force of the rubber wheel 31 on the measuring disc 30 decreases, and the detection value of the axial pressure sensor 35 decreases. At this time, the compensation cylinder 37 drives the pressing ring 32 to move closer to the rubber wheel 31, making the pressing ring 32 continue to press the rubber wheel 31 to deform, so that the side wall of the annular groove 34 is again close to the digital cable, and the axial conveying pressure is fed back through the axial pressure sensor 35.When the detected axial conveying pressure is equal to the standard axial conveying pressure, the compensation cylinder 37 stops operating, so as to compensate the axial conveying pressure in real time, thereby splitting the force-bearing situation of the digital cable, reasonably arranging the compensation mechanism, making the compensated conveying pressure equal to the standard conveying pressure, and improving the metering accuracy of the digital cable; the setting of the compensation bearing 38 enables the pressure ring 32 to have a rotational freedom between the pressure ring 32 and the compensation cylinder 37, so that the pressure ring 32 can move together with the rubber wheel 31, avoiding the pressure ring from affecting the rotational movement of the rubber wheel 31 and further affecting the metering accuracy. Secondly, the metering guide wheel 2 is set as a split structure, which is convenient to replace the rubber wheel 31 when the wear of the rubber wheel 31 exceeds the compensation range, and it is also convenient to replace the corresponding rubber wheel 31 according to the model and diameter of the digital cable.,

Claims

1. A digital cable high-precision metering device, characterized in that: The invention comprises a meter frame (1), wherein a meter guide wheel (2) is rotatably arranged on the meter frame (1), an encoder (4) is installed on the measuring shaft (3) of the meter guide wheel (2), a gravity guide wheel (5) is movably arranged on the meter frame (1), an adjustable conveying space is arranged between the gravity guide wheel (5) and the meter guide wheel (2), a digital cable passes through the conveying space, and under the action of the gravity guide wheel (5), a friction transmission pair is formed between the digital cable and the meter guide wheel (2), and an accuracy detection mechanism is arranged on the meter frame (1), the accuracy detection mechanism comprises a marking component, an identification sensor (6) and a timer (7), the marking component and the identification sensor (6) are arranged at two ends of the meter guide wheel (2) along the conveying direction of the digital cable, the marking component is used to draw a detection line on the digital cable, the identification sensor (6) is used to detect the detection line on the digital cable, and the timer (7) counts when the detection line is drawn, and the timing ends when the identification sensor (6) identifies the detection line.

2. A digital cable high-precision metering device according to claim 1, characterized in that: The marking assembly comprises a positioning ring (8) and a marking ring (9), wherein two positioning rings (8) are arranged at intervals along the conveying direction of the digital cable, the marking ring (9) is coaxially arranged between the two positioning rings (8), the digital cable passes through the positioning ring (8) and the marking ring (9), a plurality of sliding rods (10) are passed through the marking ring (9), the plurality of sliding rods (10) are arranged at intervals along the circumferential direction of the marking ring (9), the sliding rods (10) move toward the center of the marking ring (9), and a marking pen (11) is arranged at one end of the sliding rod (10) close to the center of the marking ring (9).

3. A digital cable high-precision metering device according to claim 2, characterized in that: A spring disk (12) is fixedly sleeved on the sliding rod (10), and the spring disk (12) is located in the inner ring of the marking ring (9). A spring (13) is sleeved on the sliding rod (10), and one end of the spring (13) is connected to the spring disk (12), and the other end is connected to the inner ring of the marking ring (9). The marking assembly also includes a driving ring (14), and the driving ring (14) is rotatably sleeved on the marking ring (9). A plurality of arc-shaped protrusions (15) are fixed on the outer wall of the driving ring (14), and each of the sliding rods (10) corresponds to one of the arc-shaped protrusions (15). A through hole (16) is formed on the sliding rod (10), and the driving ring (14) passes through the through hole (16). Different positions of the arc-shaped protrusions (15) contact the inner wall of the through hole (16) to drive the sliding rod (10) to move toward the center of the marking ring (9).

4. A digital cable high-precision metering device according to claim 3, characterized in that: The marking ring (9) is coaxially fixed with a mounting member (17), the mounting member (17) is fixedly connected to the meter frame (1), the outer ring of the marking ring (9) is fixed with arc-shaped teeth (18), the arc-shaped teeth (18) mesh with the rack (19), and the meter frame (1) is installed with a driving cylinder (20), and the telescopic shaft of the driving cylinder (20) is connected to one end of the rack (19).

5. A digital cable high-precision metering device according to claim 1, characterized in that: A lower pressure shaft (21) is coaxially fixed to the gravity guide wheel (5), and one end of the lower pressure shaft (21) away from the gravity guide wheel (5) is rotatably connected to a swing arm (22). A gravity main shaft (23) is fixed to the swing arm (22), and the gravity main shaft (23) is rotatably connected to the meter frame (1) through a bearing. A pushing cylinder (24) is provided on the meter frame (1), and a cylinder body of the pushing cylinder (24) is hinged on the meter frame (1), and a telescopic shaft of the pushing cylinder (24) is hinged on the swing arm (22).

6. A digital cable high-precision metering device according to claim 5, characterized in that: The meter frame (1) is provided with a measuring window (25), the measuring window (25) being formed through the measuring window (25) in a direction perpendicular to the conveying direction of the digital cable. A measuring block (26) is arranged in the measuring window (25), the measuring shaft (3) rotates through the measuring block (26), a guide rod (27) is fixed to the top of the measuring block (26), a guide hole is provided on the inner top wall of the measuring window (25), the guide rod (27) is slidably fitted in the guide hole, a radial pressure sensor (28) is installed on the inner bottom wall of the measuring window (25), the pressure shaft of the radial pressure sensor (28) contacts the measuring block (26), and a counterweight wheel (29) is fixedly sleeved on one end of the measuring shaft (3) away from the meter guide wheel (2), and the counterweight wheel (29) and the meter guide wheel (2) are distributed at both ends of the measuring block (26).

7. A digital cable high-precision metering device according to claim 6, characterized in that: The meter guide wheel (2) comprises a measuring disc (30), a rubber wheel (31) and a pressure ring (32). A rectangular notch is provided in the middle of each of the measuring disc (30) and the rubber wheel (31). A driving body (33) is fixed to one end of the measuring shaft (3) away from the counterweight wheel (29). The driving body (33) is in the shape of a rectangular parallelepiped. The measuring disc (30) and the rubber wheel (31) are sequentially sleeved on the driving body (33), and the rectangular notch is adapted to the driving body (33). An annular groove (34) is provided on the outer ring of the rubber wheel (31). The cross section of the annular groove (34) is U-shaped. The digital cable passes through the annular groove (34). The pressure ring (32) presses the rubber wheel (31) against the measuring disc (30) and squeezes the annular groove (34). An axial pressure sensor (35) is installed on the meter frame (1). The pressure shaft of the axial pressure sensor (35) contacts the measuring disc (30).

8. A digital cable high-precision metering device according to claim 7, characterized in that: A compensation frame (36) is fixed on the meter frame (1), and a compensation cylinder (37) is installed on the compensation frame (36). The telescopic direction of the compensation cylinder (37) is colinear with the axial direction of the measuring shaft (3). The telescopic shaft of the compensation cylinder (37) is fixedly connected to the inner ring of the compensation bearing (38), and the pressure ring (32) is fixedly sleeved on the outer ring of the compensation bearing (38).

9. A digital cable high-precision metering device according to claim 1, characterized in that: A meter-counting spindle (39) is rotatably mounted on the meter-counting frame (1), a driving pulley (40) is sleeved on the meter-counting spindle (39), a driven pulley (41) is sleeved on the measuring shaft (3), the driven pulley (41) is connected to the driving pulley (40) via a synchronous belt (42), and a motor (43) is mounted on the meter-counting frame (1), the output shaft of the motor (43) being connected to the meter-counting spindle (39) via a synchronous belt (42).

10. A digital cable high-precision metering device according to claim 9, characterized in that: A locking shaft assembly is arranged on both axial sides of the meter-counting spindle (39), and the locking shaft assembly comprises a locking frame (44) and an arc-shaped friction plate (45). A driving hole (46) is provided at one end of the locking frame (44) close to the meter-counting spindle (39), a driving locking shaft (47) is slidably arranged in the driving hole (46), the driving locking shaft (47) is connected to the arc-shaped friction plate (45), an electromagnet (48) is installed in the driving hole (46), a permanent magnet (49) is fixed to one end of the driving locking shaft (47) away from the arc-shaped friction plate (45), a locking shaft spring (50) is installed in the driving hole (46), two ends of the locking shaft spring (50) are respectively connected to the locking frame (44) and the driving locking shaft (47), and the electromagnet (48) generates a magnetic pole having the same magnetic property as the permanent magnet (49) when energized.

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