A through-type length measuring device for CNC cutting machine tools

Abstract

The present invention discloses a through-type length measuring device for a numerically controlled cutting machine tool, and relates to the technical field of metal plate length measurement. The present invention comprises a vacuum adsorption conveyor line body and a measuring component, wherein the measuring component comprises a mounting bracket fixedly mounted on the outside of the vacuum adsorption conveyor line body, two sets of sets of boxes are fixedly mounted on the bottom of the mounting bracket, an infrared distance sensor and an electromagnet are mounted inside the sets of boxes, a mounting rod is plugged into the bottom of the sets of boxes, and a wheeled distance meter is fixedly mounted on the bottom of the two sets of the mounting rods, and a driving source is arranged on the outside of the wheeled distance meter. The present invention can accurately calculate the inclination angle of the metal plate by using the distance difference and the horizontal spacing measured by the two sets of wheeled distance meters, and then the length of the metal plate in the inclined state can be calculated according to the length measured by the wheeled distance meter, and the measurement result is accurate. Then, through the use of the vacuum adsorption conveyor line body, the continuous measurement of the length of the metal plate can be quickly realized.

Description

Technical Field

[0001] The invention relates to the technical field of metal plate length measurement, and in particular to a through-type length measuring device for a numerically controlled cutting machine tool. Background Art

[0002] CNC cutting refers to a new control method that is given in digital form to control the workpiece instructions (or programs) of machine tools or equipment. When the instructions are given to the control device of the CNC automatic cutting machine, the cutting machine can automatically cut according to the given program.

[0003] There are many factors that cause cutting errors in CNC cutting machines, mainly: 1. Mechanical error: Long-term use will cause wear of guide rails, lead screws, bearings and other components, affecting accuracy. If the various components of the machine tool (such as the cutting head and worktable) are not aligned, the processing accuracy will be affected. It is necessary to ensure that all components are correctly aligned. 2. Electronic error: Failures of position sensors, temperature sensors, etc. may cause errors; failures of servo motors or stepper motors may cause inaccurate positioning. 3. Environmental factors: Changes in temperature will cause thermal expansion or contraction of machine tool materials, affecting accuracy; dust and pollutants may also affect the moving parts of the machine tool and the cutting quality. 4. Operational error: The operator's mistakes in setting cutting parameters will cause processing errors; improper operation of the operator (such as overload cutting) may affect processing accuracy. 5. Cutting tool problems: Wear of cutting tools will lead to inaccurate cutting; loose installation of the tool or incorrect angle will affect cutting accuracy. The above problems cannot be avoided in the CNC cutting process, so when cutting small batches of metal plates, the length is usually measured one by one. The existing measurement efficiency is low. When cutting large batches of metal plates, spot checks are performed, and it is difficult to detect measurement errors in time. Therefore, it is particularly important to set up an automated through-type measuring device. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a through-type length measuring device for a numerically controlled cutting machine tool.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A through-type length measuring device for a numerically controlled cutting machine tool comprises a vacuum adsorption conveyor line body and a measuring assembly, wherein the measuring assembly comprises a mounting bracket fixedly mounted on the outside of the vacuum adsorption conveyor line body, two sets of sets of boxes are fixedly mounted on the bottom of the mounting bracket, infrared distance sensors and electromagnets are mounted inside the sets of boxes, a mounting rod is plugged into the bottom of the sets of boxes, a permanent magnet is arranged on the top of the mounting rod, and the electromagnet can attract the permanent magnet when powered on;

[0007] Wheeled distance meters are fixedly mounted at the bottom of the two groups of mounting rods. A driving source is arranged on the outer side of the wheeled distance meter. The driving source makes the rotation distance of the distance measuring wheel on the wheeled distance meter the same as the conveying distance of the vacuum adsorption conveying line.

[0008] Further, a transmission shaft is fixedly installed on the outer side of the conveying roller on the vacuum adsorption conveyor line body, a swing rod is sleeved on the outer side of the transmission shaft, a driving friction wheel is rotatably installed on the right end of the swing rod, a transmission pulley 2 is fixedly installed on the outer side of the driving friction wheel, a transmission pulley 1 is fixedly installed on the outer side of the transmission shaft, and the transmission pulley 1 is connected to the transmission pulley 2 through a transmission belt 1;

[0009] A telescopic cylinder is hinged on the outer side of the vacuum adsorption conveyor line body, and the telescopic end of the telescopic cylinder is hinged to the rocker arm. A driving pulley is rotatably installed on the outer side of the vacuum adsorption conveyor line body, and a driven friction wheel is fixedly installed on the outer side of the driving pulley. A wheel axle is fixedly installed on the outer side of the distance measuring wheel on the wheel-type distance meter, and a driven pulley is fixedly installed on the end of the wheel axle away from the distance measuring wheel. The driven pulley is connected to the driving pulley through a second transmission belt. A transmission assembly is arranged on the outer side of the vacuum adsorption conveyor line body, and the transmission assembly is used to adjust the tightness of the second transmission belt.

[0010] Furthermore, friction grooves are provided on the outer sides of the driving friction wheel and the driven friction wheel.

[0011] Furthermore, the transmission assembly includes a transmission frame fixedly mounted on the outside of the vacuum adsorption conveyor line body, and slide grooves are opened on both sides of the front and back sides of the transmission frame. A slider is slidably connected inside the slide groove, and a tensioning pulley is rotatably installed between two groups of sliders on the same side. A top spring is arranged between the slider and the inner wall of the slide groove, and the transmission belt passes through the outer surface of the tensioning pulley.

[0012] Furthermore, four sets of guide pulleys are rotatably installed inside the transmission frame, and the transmission belt passes through the inner surface of the guide pulley. The upper two sets of guide pulleys are located between the tensioning pulley and the driven pulley, and are respectively located on both sides of the driven pulley. The closest distance between the upper two sets of guide pulleys is smaller than the diameter of the driven pulley. The lower two sets of guide pulleys are located between the tensioning pulley and the driving pulley, and are respectively located on both sides of the driving pulley. The closest distance between the lower two sets of guide pulleys is smaller than the diameter of the driving pulley.

[0013] Furthermore, a shaft frame rod is sleeved on the outer side of the wheel axle, a sleeve box is also sleeved on the top of the shaft frame rod, an electromagnet and an infrared distance sensor are also arranged inside the sleeve box, and the sleeve box is also fixedly installed under the mounting bracket, and a permanent magnet is also arranged on the top of the shaft frame rod.

[0014] Furthermore, a mounting hoop is provided at the bottom of the mounting rod, an opening is provided at the bottom of the mounting hoop, and a locking bolt is provided at the opening.

[0015] Furthermore, the cross sections of the mounting rod and the shaft support rod are both rectangular.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The present invention adopts a through-type measurement method and directly installs the device at the feeding port of the CNC cutting machine. The cut metal plate is transported through the equipment and the length is measured during the transportation process, which can not only improve the feeding speed, but also timely and effectively discover the occurrence of cutting errors, which can greatly improve the cutting quality of the packaging metal plate.

[0018] 2. The present invention sets two sets of wheel distance meters, and utilizes the distance difference and horizontal spacing measured by the two sets of wheel distance meters to accurately calculate the inclination angle of the metal plate. Then, the length of the metal plate in the inclined state can be calculated according to the length measured by the wheel distance meters. The measurement result is accurate. The vacuum adsorption conveyor line can be used in combination to quickly realize continuous measurement of the length of the metal plate with high measurement efficiency.

[0019] 3. The present invention makes the rotation distance of the distance measuring wheel on the wheel distance meter the same as the conveying distance of the vacuum adsorption conveyor line, thereby preventing the wheel distance meter from sliding relative to the metal plate during use, thereby eliminating errors. The present invention is suitable for metal plates with different surface smoothness and has high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall schematic diagram of the present invention;

[0021] Figure 2 is a schematic diagram of the measurement assembly of the present invention;

[0022] Figure 3 It is a schematic diagram of the transmission structure of the wheel-type rangefinder of the present invention;

[0023] Figure 4 It is a transmission schematic diagram of the transmission assembly of the present invention;

[0024] Figure 5 It is a schematic diagram of the installation structure of the wheel type range finder of the present invention;

[0025] Figure 6 The present invention Figure 5 The enlarged schematic diagram of part A in the middle;

[0026] Figure 7 It is a schematic diagram of measurement trajectory calculation of the present invention.

[0027] Figure numerals: 1. Vacuum adsorption conveyor line body; 11. Transmission shaft; 12. Rocker arm; 13. Telescopic cylinder; 14. Transmission pulley one; 15. Driving friction wheel; 16. Transmission pulley two; 17. Active pulley; 18. Driven friction wheel; 2. Mounting bracket; 3. Box; 31. Infrared distance sensor; 32. Electromagnet; 4. Mounting rod; 41. Mounting hoop; 42. Permanent magnet; 5. Wheel rangefinder; 51. Driven pulley; 6. Transmission assembly; 61. Transmission frame; 62. Slider; 63. Top spring; 64. Tension pulley; 65. Guide pulley; A. Left contact point; B. Right contact point; C. Right starting point; b. Contact point inclination angle; a. Sheet material inclination angle. DETAILED DESCRIPTION

[0028] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] A through-type length measuring device for a CNC cutting machine according to a preferred embodiment of the present invention will be described in detail below.

[0030] Embodiment 1, as Figure 1-Figure 7 As shown, a through-type length measuring device for a CNC cutting machine tool comprises a vacuum adsorption conveyor line body 1 and a measuring assembly, wherein the measuring assembly comprises a mounting bracket 2 fixedly mounted on the outside of the vacuum adsorption conveyor line body 1, two sets of sleeves 3 are fixedly mounted on the bottom of the mounting bracket 2, an infrared distance sensor 31 and an electromagnet 32 ​​are mounted inside the sleeve 3, a mounting rod 4 is plugged into the bottom of the sleeve 3, a permanent magnet 42 is arranged on the top of the mounting rod 4, and the electromagnet 32 ​​can attract the permanent magnet 42 when powered on;

[0031] Wheeled distance meters 5 are fixedly mounted at the bottom of the two sets of mounting rods 4 , and a driving source is arranged outside the wheeled distance meter 5 , which makes the rotation distance of the distance measuring wheel on the wheeled distance meter 5 the same as the conveying distance of the vacuum adsorption conveying line 1 .

[0032] The device can be directly installed at the feeding port of the CNC cutting machine. It should be noted that when there is no obstacle, the inclination angle range of the sheet material coming out of the feeding port of the CNC cutting machine is between 0-15°. The two sets of wheel distance meters 5 can completely cross the sheet material. When in use, the cut metal sheet is placed on the vacuum adsorption conveyor line body 1 at a certain distance. The metal sheet is adsorbed on the conveyor belt to prevent displacement in subsequent measurements and ensure accurate measurement results. The metal sheet is conveyed to the bottom of the wheel distance meter 5. When the metal sheet tilts to the left, as shown in the attached Figure 7In the state shown, the metal plate is transported downward from the top, and the wheeled distance meter 5 on the left first contacts the metal plate, which is the left contact point A. At the same time, the wheeled distance meter 5 on the right is located at the right starting point C. Since the metal plate has a certain thickness, the wheeled distance meter 5 on the left is lifted up by the metal plate. At this time, the infrared distance sensor 31 detects that the wheeled distance meter 5 is lifted up, and the external controller receives the signal and controls the driving source on the left to start. In this embodiment, the driving source is not limited. The driving source can be an existing motor. The driving source drives the distance measuring wheel on the wheeled distance meter 5 to rotate. The rotation distance of the distance measuring wheel is the same as the transportation distance of the vacuum adsorption conveying line 1. The driving source assists the distance measuring wheel to measure the distance, so as to prevent the wheeled distance meter 5 from sliding relative to the metal plate during use, thereby eliminating errors. It is suitable for metal plates with different surface smoothness and has high measurement accuracy. When the wheeled distance meter 5 on the right is lifted up, that is, the wheeled distance meter 5 on the right is located near Figure 7 The position of the contact point B in the middle right can be measured, and the length of the line segment BC can be tested. Since the horizontal distance between the two sets of wheel distance measuring instruments 5 is constant, that is, the length of the line segment AC is constant, and the line segment BC is perpendicular to the line segment AC, the size of the contact point inclination angle b can be calculated according to trigonometric functions. Figure 7 The inclination angle a of the middle sheet is the same as the contact inclination angle b. When the wheel distance meter 5 on the left is away from the metal plate, the length measured by the wheel distance meter 5 is the length of the line segment AD. Then the length of the metal plate can be calculated according to the trigonometric function. Therefore, in actual use, there is no need to adjust the position of the metal plate. After getting off the CNC cutting machine, the length can be measured directly. The measurement is convenient and efficient. All the cut metal plates can be measured by the method without missing any measurement. In a large-scale processing environment, the machine cutting error can be found in time, and the workers can be reminded to repair the CNC cutting machine in time.

[0033] At the same time, the device utilizes the magnetic force of the electromagnet 32 ​​and the magnetic force of the permanent magnet 42 to attract each other, so that the wheeled rangefinder 5 can be magnetically suspended, and the magnetic force can be set to be slightly smaller than the gravity of the wheeled rangefinder 5, the mounting rod 4 and the driving source, so that the metal plate can easily lift the wheeled rangefinder 5, and in the measurement process, since the wheeled rangefinder 5 utilizes auxiliary drive, it does not need to be driven by a large friction force, and there will be no functional interference, and in the actual measurement process, the threshold of the infrared distance sensor 31 is pre-adjusted, so that the device is suitable for measuring metal plates of different thicknesses.

[0034] Embodiment 2 provides a driving source for a wheeled rangefinder 5;

[0035] like Figure 1-Figure 6As shown, a transmission shaft 11 is fixedly installed on the outer side of the conveying roller on the vacuum adsorption conveyor line body 1, a swing rod 12 is sleeved on the outer side of the transmission shaft 11, a driving friction wheel 15 is rotatably installed on the right end of the swing rod 12, a transmission pulley 2 16 is fixedly installed on the outer side of the driving friction wheel 15, a transmission pulley 14 is fixedly installed on the outer side of the transmission shaft 11, and the transmission pulley 14 is connected to the transmission pulley 2 16 through a transmission belt 1;

[0036] A telescopic cylinder 13 is hinged on the outer side of the vacuum adsorption conveyor line body 1, and the telescopic end of the telescopic cylinder 13 is hinged to the rocker arm 12. A driving pulley 17 is rotatably installed on the outer side of the vacuum adsorption conveyor line body 1, and a driven friction wheel 18 is fixedly installed on the outer side of the driving pulley 17. A wheel axle is fixedly installed on the outer side of the distance measuring wheel on the wheeled distance meter 5, and a driven pulley 51 is fixedly installed on the end of the wheel axle away from the distance measuring wheel. The driven pulley 51 is connected to the driving pulley 17 through a second transmission belt. A transmission assembly 6 is arranged on the outer side of the vacuum adsorption conveyor line body 1, and the transmission assembly 6 is used to adjust the tightness of the second transmission belt.

[0037] Under the action of the metal plate, the wheeled rangefinder 5 on the left is lifted. At this time, the infrared distance sensor 31 detects that the wheeled rangefinder 5 is lifted. The external controller receives the signal and controls the operation of the telescopic cylinder 13 on the left. The telescopic cylinder 13 extends to push the swing rod 12 to swing upward. The swing rod 12 drives the driving friction wheel 15 to contact the driven friction wheel 18. While the vacuum adsorption conveyor line body 1 is conveying, the conveying roller on it drives the transmission shaft 11 to rotate, the transmission shaft 11 drives the transmission pulley 1 14 to rotate, the transmission pulley 1 14 drives the transmission pulley 2 16 to rotate, and the transmission pulley 2 16 drives the driving friction wheel 15 to rotate. The driving friction wheel 15 always runs synchronously with the conveying roller. When the driving friction wheel 15 contacts the driven friction wheel 18, the driving friction wheel 15 drives the driven friction wheel 18 to rotate through friction force, the driven friction wheel 18 drives the active pulley 17 to rotate, the active pulley 17 drives the driven pulley 51 to rotate, and the driven pulley 51 drives the distance measuring wheel to rotate synchronously without the need for additional drive.

[0038] By setting the magnetic force slightly smaller than the sum of the gravity of the wheeled rangefinder 5, the mounting rod 4 and the driven pulley 51 and the adjustment limiting force of the transmission assembly 6, the metal plate can easily lift the wheeled rangefinder 5, and the adjustment limiting force of the driven pulley 51 and the transmission assembly 6 is much smaller than the gravity of the motor. There is no need for the electromagnet 32 ​​to generate a large magnetic force, thereby reducing energy loss.

[0039] Furthermore, friction grooves are provided on the outer sides of the driving friction wheel 15 and the driven friction wheel 18 to increase the friction force and make the transmission of the driving friction wheel 15 and the driven friction wheel 18 more stable.

[0040] Embodiment 3 provides a transmission assembly 6 structure;

[0041] like Figure 4 As shown, the transmission assembly 6 includes a transmission frame 61 fixedly mounted on the outside of the vacuum adsorption conveyor line body 1, and slide grooves are provided on both sides of the front and back sides of the transmission frame 61. A slider 62 is slidably connected inside the slide groove. A tensioning pulley 64 is rotatably installed between the two groups of sliders 62 on the same side, and a top spring 63 is arranged between the slider 62 and the inner wall of the slide groove, and the transmission belt 2 passes through the outer surface of the tensioning pulley 64.

[0042] Furthermore, four sets of guide pulleys 65 are rotatably installed inside the transmission frame 61, and the transmission belt passes through the inner surface of the guide pulley 65. The upper two sets of guide pulleys 65 are located between the tensioning pulley 64 and the driven pulley 51, and are respectively located on both sides of the driven pulley 51. The closest distance between the upper two sets of guide pulleys 65 is smaller than the diameter of the driven pulley 51. The lower two sets of guide pulleys 65 are located between the tensioning pulley 64 and the driving pulley 17, and are respectively located on both sides of the driving pulley 17. The closest distance between the lower two sets of guide pulleys 65 is smaller than the diameter of the driving pulley 17.

[0043] When the wheeled rangefinder 5 is lifted, the wheeled rangefinder 5 drives the driven pulley 51 to rise through the wheel axle, the driven pulley 51 stretches the transmission belt 2, the transmission belt 2 drives the two sets of tensioning pulleys 64 to move together, otherwise the top spring 63 pushes the two sets of tensioning pulleys 64 to separate, ensuring that the transmission belt 2 is always kept taut and the transmission is stable. By setting the magnetic force to be slightly smaller than the weight of the wheeled rangefinder 5, the mounting rod 4 and the driven pulley 51 and the elastic force of the top spring 63, the metal plate can easily lift the wheeled rangefinder 5.

[0044] Embodiment 4, as Figure 1-Figure 3 As shown, the outer side of the wheel axle is sleeved with an axle frame rod, and the top of the axle frame rod is also sleeved with a sleeve box 3, an electromagnet 32 ​​and an infrared distance sensor 31 are also arranged inside the sleeve box 3, and the sleeve box 3 is also fixedly installed under the mounting bracket 2, and a permanent magnet 42 is also arranged on the top of the axle frame rod.

[0045] This design makes the lifting of the wheeled distance meter 5 more stable.

[0046] Embodiment 5, as Figure 5 As shown, a mounting hoop 41 is provided at the bottom of the mounting rod 4, an opening is provided at the bottom of the mounting hoop 41, and a locking bolt is provided at the opening, so that the installation and disassembly are convenient, and the existing wheeled distance meter 5 can be selected.

[0047] Furthermore, the cross-sections of the mounting rod 4 and the shaft support rod are both rectangular and will not rotate when being raised or lowered.

[0048] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A through-type length measuring device for a CNC cutting machine tool, comprising a vacuum adsorption conveyor line body (1) and a measuring component, characterized in that: The measuring assembly comprises a mounting bracket (2) fixedly mounted on the outside of the vacuum adsorption conveyor line (1), two sets of sleeves (3) fixedly mounted on the bottom of the mounting bracket (2), an infrared distance sensor (31) and an electromagnet (32) mounted inside the sleeve (3), a mounting rod (4) plugged into the bottom of the sleeve (3), a permanent magnet (42) disposed on the top of the mounting rod (4), the electromagnet (32) being able to attract the permanent magnet (42) when energized, a wheeled distance meter (5) fixedly mounted on the bottom of the two sets of mounting rods (4), a driving source disposed on the outside of the wheeled distance meter (5), the driving source causing the distance metering wheel on the wheeled distance meter (5) to rotate the same distance as the conveying distance of the vacuum adsorption conveyor line (1); A transmission shaft (11) is fixedly mounted on the outer side of the conveying roller on the vacuum adsorption conveying line body (1), a swing rod (12) is sleeved on the outer side of the transmission shaft (11), a driving friction wheel (15) is rotatably mounted on the right end of the swing rod (12), a second transmission pulley (16) is fixedly mounted on the outer side of the driving friction wheel (15), a first transmission pulley (14) is fixedly mounted on the outer side of the transmission shaft (11), the first transmission pulley (14) is connected to the second transmission pulley (16) through a transmission belt, and a telescopic air guide is hinged on the outer side of the vacuum adsorption conveying line body (1). The telescopic end of the telescopic cylinder (13) is hingedly connected to the swing rod (12); a driving pulley (17) is rotatably mounted on the outer side of the vacuum adsorption conveyor line (1); a driven friction wheel (18) is fixedly mounted on the outer side of the driving pulley (17); a wheel axle is fixedly mounted on the outer side of the distance measuring wheel on the wheel type distance meter (5); a driven pulley (51) is fixedly mounted on the end of the wheel axle away from the distance measuring wheel; the driven pulley (51) is connected to the driving pulley (17) through a transmission belt; a transmission assembly (6) is arranged on the outer side of the vacuum adsorption conveyor line (1) ), a transmission assembly (6) is used to adjust the tension of the second transmission belt, the transmission assembly (6) comprises a transmission frame (61) fixedly mounted on the outside of the vacuum adsorption conveyor line body (1), a slide groove is penetrated on both sides of the front and back sides of the transmission frame (61), a slider (62) is slidably connected inside the slide groove, a tensioning pulley (64) is rotatably mounted between the two groups of sliders (62) on the same side, a top spring (63) is arranged between the slider (62) and the inner wall of the slide groove, the second transmission belt passes through the outer surface of the tensioning pulley (64), and the transmission frame (61) is rotatably mounted inside A set of guide pulleys (65), the transmission belt passes through the inner surface of the guide pulley (65), the upper two sets of guide pulleys (65) are located between the tension pulley (64) and the driven pulley (51), and are respectively located on both sides of the driven pulley (51), and the closest distance between the upper two sets of guide pulleys (65) is smaller than the diameter of the driven pulley (51), and the lower two sets of guide pulleys (65) are located between the tension pulley (64) and the driving pulley (17), and are respectively located on both sides of the driving pulley (17), and the closest distance between the lower two sets of guide pulleys (65) is smaller than the diameter of the driving pulley (17); When in use, the cut metal plates are placed on the vacuum adsorption conveyor line (1) at a certain interval, the metal plates are adsorbed on the conveyor belt, and the metal plates are conveyed to the bottom of the wheeled distance meter (5). When the metal plate tilts to the left, the metal plate is conveyed downward from the top, and the wheeled distance meter (5) on the left first contacts the metal plate, which is the left contact point A. At the same time, the wheeled distance meter (5) on the right is located at the right starting point C. Since the metal plate has a certain thickness, the wheeled distance meter (5) on the left is lifted under the action of the metal plate. At this time, the infrared distance sensor (31) detects that the wheeled distance meter (5) is lifted, and the external controller receives the signal and controls the driving source on the left to start. The driving source drives the distance measuring wheel on the wheeled distance meter (5) to rotate. The rotation distance of the measuring wheel is the same as the conveying distance of the vacuum adsorption conveyor line (1). The driving source assists the measuring wheel to measure the distance. When the wheeled distance meter (5) on the right is lifted, that is, the wheeled distance meter (5) on the right is located at the right contact point B, the length of the line segment BC can be tested. Since the horizontal distance between the two sets of wheeled distance meters (5) is constant, that is, the length of the line segment AC is constant, the line segment BC is perpendicular to the line segment AC, and the size of the contact inclination angle b can be calculated according to trigonometric functions. The sheet metal inclination angle a is the same as the contact inclination angle b. When the wheeled distance meter (5) on the left is away from the metal plate, the length measured by the wheeled distance meter (5) is the length of the line segment AD, and then the length of the metal plate can be calculated according to trigonometric functions.

2. A through-type length measuring device for a CNC cutting machine tool according to claim 1, characterized in that: The outer sides of the driving friction wheel (15) and the driven friction wheel (18) are both provided with friction grooves.

3. A through-type length measuring device for a CNC cutting machine tool according to claim 1, characterized in that: The outer side of the wheel axle is sleeved with an axle frame rod, and the top of the axle frame rod is also sleeved with a sleeve box (3), and an electromagnet (32) and an infrared distance sensor (31) are also arranged inside the sleeve box (3). The sleeve box (3) is also fixedly installed below the mounting bracket (2), and a permanent magnet (42) is also arranged on the top of the axle frame rod.

4. A through-type length measuring device for a CNC cutting machine tool according to claim 3, characterized in that: A mounting hoop (41) is provided at the bottom of the mounting rod (4), an opening is provided at the bottom of the mounting hoop (41), and a locking bolt is provided at the opening.

5. A through-type length measuring device for a CNC cutting machine tool according to claim 4, characterized in that: The cross sections of the mounting rod (4) and the shaft support rod are both rectangular.

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