Length measuring device for CNC machine tools

Abstract

This utility model relates to the field of CNC machine tool technology, and provides a length measuring device for CNC machine tools, including a CNC machine tool machining platform; a fixed plate on the surface of the CNC machine tool machining platform; a measuring column fixedly connected to the top of the fixed plate; a fixed ring fixedly connected to the surface of the measuring column; an extension ring slidably connected to the surface of the measuring column; a spring fixedly connected between the fixed ring and the extension ring; a compensation plate fixedly connected to the end of the measuring column; a measuring frame fixedly connected to the surface of the extension ring; and graduation lines on the surface of the measuring column. Through the contraction and rebound design of the spring, the top of the measuring frame is tightly fitted to the bottom of the tool, reducing measurement errors caused by uneven force or mechanical clearance. The zero position of the graduation line on the surface of the measuring column corresponds to the top of the extension ring, and the end of the measuring frame is horizontally set with the top of the compensation plate, providing a unified reference plane for the measurement of the graduation lines, increasing the consistency of the reference plane when the measuring frame is measuring, and further improving the accuracy.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, and in particular to a length measuring device for CNC machine tools. Background Technology

[0002] In the industrial manufacturing sector, as industries such as aerospace and automotive manufacturing increasingly demand higher precision and production efficiency in parts processing, traditional machine tools, due to their low precision and insufficient flexibility, are struggling to meet the diverse production needs of complex parts. CNC machine tools, as the core of automated machining equipment, control the movement of cutting tools and worktables via computer programs, enabling precise execution of drilling, milling, and turning processes. They possess significant advantages in high precision, high efficiency, and high flexibility, making them key equipment in modern manufacturing. However, in complex multi-process machining scenarios, frequent tool changes leading to differences in tool length can cause deviations in cutting depth, severely impacting part machining accuracy. CNC machine tools have introduced tool length compensation technology. This technology measures the actual tool length in real time through the CNC system, compares it with the theoretical value to generate compensation parameters, and automatically adjusts the Z-axis coordinate during alternating operation of multiple tools. This effectively eliminates machining deviations caused by tool length errors, providing a reliable guarantee for the high-quality production of precision parts.

[0003] CN1 20085609A discloses an automatic measurement and correction method for a CNC engraving machine based on Mastercam software, comprising the following steps: S1, developing a post-processor for Mastercam software and adapting the post-processor to the CNC engraving JD50 system; S2, after adaptation, further configuring the measurement logic code of the CNC engraving JD50 system; S3, based on the configured measurement logic code, using Mastercam software to generate a machining main program, configuring a second type of user macro program interface in the machining main program; the CNC engraving JD50 system drives the CNC engraving machine to perform probe calibration, online measurement, and tool correction operations through variable mapping.

[0004] CN221891532U discloses an automatic rapid ranging device for a CNC drilling and milling machine. The ranging device includes an X-axis ranging device and a Y-axis ranging device, which are respectively fixed at the X-axis and Y-axis edges of the worktable. The X-axis ranging device includes a first laser ranging sensor, a first guide rail, a first slide, a first lead screw, and a first motor. The bottom surface of the first guide rail is fixed to the worktable. The first slide is slidably connected to the first guide rail. The first laser ranging sensor is fixedly connected to the first slide via a first sensor mounting base. The base is connected to the first lead screw, and one end of the first lead screw is connected to the telescopic rod of the first motor via a coupling; the Y-axis ranging device includes a second laser ranging sensor, a second guide rail, a second slide block, a second lead screw, a second motor, and a transmission mechanism. The bottom surface of the second guide rail is fixed to the worktable, the second slide block is slidably connected to the second guide rail, the second laser ranging sensor is fixedly connected to the second slide block via a second sensor mounting base, the second sensor mounting base is connected to the second lead screw, and one end of the second lead screw is connected to the first motor via the transmission mechanism.

[0005] CN222824073U discloses a multi-dimensional adjustable rangefinder fixing device, comprising a position adjuster and an angle adjuster. The position adjuster includes a fixed base and a slide rail with a T-shaped groove. The slide rail is connected to the fixed base via a central pivot, and the slide rail can rotate 0-360° around the pivot. The slide rail has a cuboid structure with an inverted T-shaped groove at the center of the upper part. The angle adjuster is mounted on the slide rail and consists of a slider, a top plate, a bottom plate, a spring, and studs. The slider at the bottom is located within the T-shaped groove of the slide rail and can slide within the T-shaped groove. The slider is connected to the bottom plate. Three studs are evenly arranged between the bottom plate and the top plate, and springs are installed on the studs. The top plate is the mounting surface for the rangefinder. By adjusting the compression of the spring, the measuring angle of the rangefinder can be adjusted, thus achieving multi-dimensional adjustment of the rangefinder.

[0006] CN120176543A discloses an automatic length measurement and operation control system for object processing, comprising: a data acquisition module, an operation control module, and a feedback adjustment module; the data acquisition module is used to acquire the length measurement data of the object, perform length calibration by configuring a calibration block, and determine whether the length calibration is successful; the operation control module is used to control the operation path and operation position of the target device according to the length measurement data of the object, and process the object, and determine whether to stop the operation based on the remaining length of the object; the feedback adjustment module is used to monitor whether the operation position of the target device has errors during the object processing, and adjust the initial operation path according to the horizontal and vertical coordinates of the operation position.

[0007] In precision measurement operations, even slight differences in the magnitude of applied force can lead to significant measurement errors. Because the materials of the cutting tool and measuring device possess elastic properties, they will undergo elastic deformation when the applied measuring force exceeds the ideal range. This deformation alters the correspondence between the measurement reference point and the actual geometric position of the cutting tool, causing the measurement data to deviate from the true value. This, in turn, has a cascading effect on the accuracy of subsequent machining processes, compromising the stringent requirements for dimensional tolerances in precision manufacturing. In short, during measurement, differences in the magnitude of applied force can cause elastic deformation of the cutting tool or measuring device, resulting in measurement results that deviate from the true value. Utility Model Content

[0008] Long-term production practice has revealed that differences in the applied force during measurement can cause elastic deformation of the cutting tool or measuring device, resulting in measurement results that deviate from the true value.

[0009] In view of this, the present invention aims to provide a length measuring device for CNC machine tools.

[0010] The system includes a CNC machine tool machining platform; a support frame is fixedly attached to the surface of the CNC machine tool machining platform; a spindle component is slidably connected to one side of the support frame; a fixture is installed at the bottom of the spindle component; a cutting tool is held at the bottom of the fixture; a fixed plate is on the surface of the CNC machine tool machining platform; a measuring column is fixedly attached to the top of the fixed plate; a fixed ring is fixedly attached to the surface of the measuring column; an extension ring is slidably connected to the surface of the measuring column; a spring is fixedly connected between the fixed ring and the extension ring; a compensation plate is fixedly attached to the end of the measuring column; a measuring frame is fixedly attached to the surface of the extension ring; the end of the measuring frame and the top of the compensation plate are horizontally aligned; a scale line is provided on the surface of the measuring column; the top of the extension ring corresponds to the zero position of the scale line; through the contraction and rebound design of the spring, the top of the measuring frame and the bottom of the cutting tool are tightly fitted, reducing measurement errors caused by uneven force or mechanical clearance; the zero position of the scale line on the surface of the measuring column corresponds to the top of the extension ring; the end of the measuring frame and the top of the compensation plate are horizontally aligned, providing a unified reference plane for the scale line measurement, increasing the consistency of the reference plane during measurement, and further improving accuracy.

[0011] In one embodiment, a telescopic rod is fixedly connected to one side of the expansion ring; a mounting block is rotatably connected to the telescopic end of the telescopic rod; a magnifying glass is rotatably connected to the top of the mounting block; the magnifying glass magnifies the scale lines, enabling the operator to clearly distinguish smaller scale units and reducing reading errors caused by unclear visual perception; the telescopic rod is stretched to adjust the distance between the magnifying glass and the scale lines; the mounting block and the magnifying glass are rotated to adjust the observation angle, reducing misreading of the scale due to viewing angle deviation.

[0012] In one embodiment, a bolt is threaded onto one side of the expansion ring; the bolt is correspondingly positioned to the measuring frame; by pressing the end of the bolt against the surface of the measuring column, the expansion ring is fixed to the measuring column using the thread tightening force, which can lock the expansion ring, reduce the displacement between the expansion ring and the measuring column caused by spring rebound, reduce the deviation of the scale reading from the true value, and increase the stability of the measurement data.

[0013] In one embodiment, a felt is fixed to the surface of the measuring column; the felt is correspondingly arranged to the end of the bolt; by using the felt as an elastic buffer layer, the concentrated pressure at the end of the bolt is distributed to a larger area, reducing scratches or indentations on the surface of the measuring column when the bolt is tightened, reducing damage, increasing the smoothness of the measuring column surface, and increasing the sliding accuracy of the expansion ring.

[0014] In one embodiment, a rectangular groove is formed on one side of the compensation plate; a battery is installed in the middle of the rectangular groove; a lamp is installed at the bottom of the compensation plate; the lamp is electrically connected to the battery; the lamp is positioned on the side near the magnifying glass; illuminating the scale lines with the lamp makes every detail of the scale lines clearly visible, reducing reading deviations caused by dim lighting; at the same time, the light from the lamp shines from the side, reducing specular reflections of strong vertical light on the scale line surface, which affects the line of sight and increases the clarity and accuracy of the reading.

[0015] In one embodiment, a level is fixed inside the measuring frame; the level is set at the top of the measuring frame; by installing the level in the middle of the measuring frame, the parallelism between the measuring frame and the fixture can be directly reflected when the tool is pressed down, reducing the tilt error of the compensation plate and making the reading of the scale line correspond to the actual length of the tool.

[0016] In one embodiment, a magnetic base is installed at the bottom of the fixed plate; the magnetic base is disposed between the CNC machine tool processing platform and the fixed plate; a controller is disposed on one side of the magnetic base; by rotating the controller, the magnetic base generates a magnetic field, which fixes the fixed plate on the surface of the CNC machine tool processing platform. This can reduce the displacement of the fixed plate on the surface of the CNC machine tool processing platform when the tool presses down on the measuring frame, and increase the stability of the compensation plate during measurement.

[0017] In one embodiment, a miniature air pump is fixedly connected to one side of the magnetic base; the miniature air pump is electrically connected to a battery; an air inlet is fixedly connected to one side of the miniature air pump; the magnetic base has an internal cavity; a set of air outlets is fixedly connected to the bottom of the magnetic base; the air outlets are connected to the miniature air pump; the air outlets are inclined; when the magnetic base approaches the surface of the CNC machine tool processing platform, air is drawn in through the air inlet and blown out through the air outlet, which disperses impurities on the surface of the CNC machine tool processing platform, reducing the contact between impurities and the bottom of the magnetic base, causing the measuring column to tilt, while increasing the adsorption force between the magnetic base and the surface of the CNC machine tool processing platform, thus increasing the reliability of adsorption.

[0018] In one embodiment, a plurality of reinforcing columns are fixedly connected to the surface of the fixing plate; the ends of the reinforcing columns are fixedly connected to the fixing ring; by setting a plurality of reinforcing columns between the fixing ring and the fixing plate, the stability of the measuring column can be increased, and when it is subjected to external force, the force is distributed to the plurality of reinforcing columns, reducing the deformation of the measuring column under overload.

[0019] In one embodiment, a dust cover is fixedly connected between the fixed ring and the expansion ring; the dust cover encloses the measuring column and the spring; by enclosing the measuring column with the dust cover, debris and impurities are intercepted from entering the gap between the measuring column and the expansion ring, reducing the movement and jamming of the expansion ring, reducing the wear on the surface of the measuring column caused by impurities entering the gap, and increasing the service life of the measuring column.

[0020] This utility model provides a length measuring device for CNC machine tools. Through the contraction and rebound design of the spring, the top of the measuring frame and the bottom of the tool are closely fitted, reducing measurement errors caused by uneven force or mechanical clearance. The zero position of the scale line on the surface of the measuring column corresponds to the top of the expansion ring. The end of the measuring frame and the top of the compensation plate are set horizontally, providing a unified reference plane for scale line measurement, increasing the consistency of the reference plane when the measuring frame is measuring, and further improving the accuracy.

[0021] In addition, the magnifying glass magnifies the scale lines, allowing the operator to clearly distinguish smaller scale units and reduce reading errors caused by unclear visual perception. The telescopic rod extends to adjust the distance between the magnifying glass and the scale lines, and the mounting block and magnifying glass rotate to adjust the observation angle, reducing misreading of the scale due to viewing angle deviation.

[0022] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an undue limitation of this utility model; in the drawings:

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the magnetic base in this utility model;

[0026] Figure 3 This is a schematic diagram of the air pump in this utility model;

[0027] Figure 4 This is a schematic diagram of the expansion ring in this utility model;

[0028] Figure 5This is a schematic diagram of the magnifying glass in this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. CNC machine tool machining platform; 11. Support frame

[0031] 12. Spindle assembly 13. Fixture

[0032] 14. Cutting tool 15. Fixing plate

[0033] 16. Measuring column; 17. Fixing ring

[0034] 18. Expansion ring 19. Spring

[0035] 110. Compensation plate; 111. Measuring frame

[0036] 112. Scale line 2. Telescopic rod

[0037] 21. Mounting block 22. Magnifying glass

[0038] 3. Bolts 4. Felt

[0039] 5. Rectangular slot 51. Battery

[0040] 52. Lighting fixtures; 6. Level.

[0041] 7. Magnetic base; 71. Controller

[0042] 8. Miniature air pump 81. Air inlet

[0043] 82. Air outlet; 9. Reinforcing column

[0044] 100. Dust cover Detailed Implementation

[0045] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0047] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices. "Fixed" or "fixed connection" generally refers to common mechanical connection methods, such as threaded connections, welding, or bonding.

[0048] To address the technical problem of measurement errors caused by uneven force as mentioned in the background section, this utility model provides a length measuring device for CNC machine tools, such as... Figures 1 to 5As shown, the system includes a CNC machine tool machining platform 1; a support frame 11 is fixedly connected to the surface of the CNC machine tool machining platform 1; a spindle component 12 is slidably connected to one side of the support frame 11; a fixture 13 is installed at the bottom of the spindle component 12; a tool 14 is held at the bottom of the fixture 13; a fixing plate 15 is present on the surface of the CNC machine tool machining platform 1; a measuring column 16 is fixedly connected to the top of the fixing plate 15; a fixing ring 17 is fixedly connected to the surface of the measuring column 16; and an extension ring 18 is slidably connected to the surface of the measuring column 16. A spring 19 is fixedly connected between the fixed ring 17 and the expanding ring 18; a compensation plate 110 is fixedly connected to the end of the measuring column 16; a measuring frame 111 is fixedly connected to the surface of the expanding ring 18; the end of the measuring frame 111 and the top of the compensation plate 110 are horizontally positioned; a scale line 112 is provided on the surface of the measuring column 16; the top of the expanding ring 18 is positioned corresponding to the zero position of the scale line 112; during operation, the fixed plate 15 is placed on the surface of the CNC machine tool machining platform 1, so that the measuring frame 111 is below the cutting tool 14. The spindle assembly 12 is moved on the surface of the support frame 11, causing the tool 14 to contact the top of the measuring frame 111. The tool 14 is then pressed down further, causing the compensation plate 110 to contact the bottom of the fixture 13. At this time, the spring 19 is compressed by the expansion ring 18, storing pressure. After the compensation plate 110 contacts the bottom of the fixture 13, the spring 19 releases the stored pressure and rebounds, pushing the expansion ring 18 from below, making the top of the measuring frame 111 fit tightly against the tool 14. The top of the expansion ring 18 and the scale line 1 are then observed. The corresponding position of 12 is used to read the length value of the tool 14. Through the contraction and rebound design of the spring 19, the top of the measuring frame 111 is tightly fitted with the bottom of the tool 14, reducing measurement errors caused by uneven force or mechanical clearance. The zero position of the scale line 112 on the surface of the measuring column 16 corresponds to the top of the expansion ring 18. The end of the measuring frame 111 is set horizontally with the top of the compensation plate 110, providing a unified reference plane for the measurement of the scale line 112, increasing the consistency of the reference plane when the measuring frame 111 is measuring, and further improving the accuracy.

[0049] To address the issue of misreading the scale due to viewing angle deviation, in another embodiment of this invention, such as... Figures 1 to 5 As shown, a telescopic rod 2 is fixedly connected to one side of the extension ring 18; a mounting block 21 is rotatably connected to the telescopic end of the telescopic rod 2; a magnifying glass 22 is rotatably connected to the top of the mounting block 21; during operation, when reading the length value of the tool 14, the mounting block 21 is pulled to extend the telescopic rod 2, and then the mounting block 21 and the magnifying glass 22 are rotated to adjust the angle so that the middle part of the magnifying glass 22 magnifies the scale line 112. By magnifying the scale line 112 through the magnifying glass 22, the operator can clearly distinguish smaller scale units, reducing reading errors caused by unclear visual perception. The extension rod 2 is stretched to adjust the distance between the magnifying glass 22 and the scale line 112, and the mounting block 21 and the magnifying glass 22 are rotated to adjust the observation angle, reducing misreading of the scale due to viewing angle deviation.

[0050] To achieve the function of fixing the expansion ring 18, in another embodiment of this utility model, such as... Figures 1 to 5 As shown, a bolt 3 is threadedly connected to one side of the expansion ring 18; the bolt 3 is correspondingly set with the measuring frame 111; during operation, when reading the length value of the tool 14, the bolt 3 is rotated so that its end contacts the surface of the measuring column 16, and the bolt 3 is rotated further so that its end presses against the measuring column 16 to fix the expansion ring 18; by pressing the surface of the measuring column 16 with the end of the bolt 3, the expansion ring 18 is fixed on the measuring column 16 by the thread tightening force, which can lock the expansion ring 18 and reduce the displacement between the expansion ring 18 and the measuring column 16 caused by the spring 19 rebound, reduce the deviation of the scale line 112 reading from the true value, and increase the stability of the measurement data.

[0051] To reduce damage to the measuring column 16, in another embodiment of this invention, such as... Figure 3 As shown, a felt 4 is fixed to the surface of the measuring column 16; the felt 4 is correspondingly set to the end of the bolt 3; during operation, the felt 4 is set between the measuring column 16 and the end of the bolt 3 to reduce direct contact between the end of the bolt 3 and the measuring column 16. By using the felt 4 as an elastic buffer layer, the concentrated pressure at the end of the bolt 3 is distributed to a larger area, reducing scratches or indentations on the surface of the measuring column 16 when the bolt 3 is tightened, reducing damage, increasing the smoothness of the surface of the measuring column 16, and increasing the sliding accuracy of the expansion ring 18.

[0052] To increase reading clarity, in another embodiment of this invention, such as... Figures 3 to 5 As shown, a rectangular groove 5 is provided on one side of the compensation plate 110; a battery 51 is installed in the middle of the rectangular groove 5; a lamp 52 is installed at the bottom of the compensation plate 110; the lamp 52 is electrically connected to the battery 51; the lamp 52 is located on the side near the magnifying glass 22; during operation, when reading the length value of the tool 14, the battery 51 provides current to the lamp 52, causing the lamp 52 to emit light and illuminate the scale line 112. Illuminating the scale line 112 with the lamp 52 makes every detail of the scale line 112 clearly visible, reducing reading deviations caused by dim light. At the same time, the light from the lamp 52 shines from the side, reducing the specular reflection of strong vertical light on the surface of the scale line 112, which affects the line of sight and increases the clarity and accuracy of the reading.

[0053] To achieve a horizontal operation for the measuring frame 111, in another embodiment of this utility model, such as... Figures 1 to 5As shown, a level 6 is fixedly connected inside the measuring frame 111; the level 6 is set at the top of the measuring frame 111; during operation, after the cutter 14 is pressed down and the compensation plate 110 contacts the bottom of the fixture 13, the level 6 is observed to determine whether the measuring frame 111 is in a horizontal position, thereby reducing measurement errors. By installing the level 6 in the middle of the measuring frame 111, the parallelism between the measuring frame 111 and the fixture 13 can be directly reflected when the cutter 14 is pressed down, reducing the tilt error of the compensation plate 110 and making the reading of the scale line 112 correspond to the actual length of the cutter 14.

[0054] To achieve the fixing function of the fixing plate 15, in another embodiment of this utility model, such as Figures 1 to 3 As shown, a magnetic base 7 is installed at the bottom of the fixed plate 15; the magnetic base 7 is disposed between the CNC machine tool processing platform 1 and the fixed plate 15; a controller 71 is disposed on one side of the magnetic base 7; during operation, after the magnetic base 7 contacts the surface of the CNC machine tool processing platform 1, the controller 71 is rotated to make the magnetic base 7 generate a magnetic field and adhere to the surface of the CNC machine tool processing platform 1, thus fixing the fixed plate 15. By rotating the controller 71 to generate a magnetic field in the magnetic base 7, the fixed plate 15 is fixed on the surface of the CNC machine tool processing platform 1. This can reduce the displacement of the fixed plate 15 on the surface of the CNC machine tool processing platform 1 when the tool 14 presses down on the measuring frame 111, thereby increasing the stability of the compensation plate 110 during measurement.

[0055] To achieve the function of cleaning the bottom of the magnetic base 7, in another embodiment of this utility model, such as... Figures 1 to 3 As shown, a miniature air pump 8 is fixedly connected to one side of the magnetic base 7; the miniature air pump 8 is electrically connected to the battery 51; an air inlet 81 is fixedly connected to one side of the miniature air pump 8; the magnetic base 7 has an internal cavity; a set of air outlets 82 are fixedly connected to the bottom of the magnetic base 7; the air outlets 82 are connected to the miniature air pump 8; the air outlets 82 are inclined; during operation, when the magnetic base 7 is moved to the surface of the CNC machine tool processing platform 1, the battery 51 provides current to the miniature air pump 8, causing it to draw in air from the air inlet 81 and then blow it out from the set of air outlets 82, thus dispersing impurities at the bottom of the magnetic base 7. When the magnetic base 7 approaches the surface of the CNC machine tool processing platform 1, the air inlet 81 draws in air and the air outlets 82 blow out airflow, dispersing impurities on the surface of the CNC machine tool processing platform 1. This reduces the contact between impurities and the bottom of the magnetic base 7, causing the measuring column 16 to tilt, while increasing the adsorption force between the magnetic base 7 and the surface of the CNC machine tool processing platform 1, thus increasing the reliability of adsorption.

[0056] To reduce the deformation of the measuring column 16, in another embodiment of this utility model, such as... Figures 1 to 3As shown, a plurality of reinforcing columns 9 are fixedly connected to the surface of the fixing plate 15; the ends of the reinforcing columns 9 are fixedly connected to the fixing ring 17; during operation, the plurality of reinforcing columns 9 provide additional support points to the fixing ring 17, increasing the stability of the measuring column 16, while keeping the measuring column 16 perpendicular to the fixing plate 15. By setting a plurality of reinforcing columns 9 between the fixing ring 17 and the fixing plate 15, the stability of the measuring column 16 can be increased. When it is subjected to external force, the force is distributed to the plurality of reinforcing columns 9, reducing the deformation of the measuring column 16 under overload.

[0057] To increase the service life of the measuring column 16, in another embodiment of this utility model, such as... Figure 1 As shown, a dust cover 100 is fixedly connected between the fixed ring 17 and the expansion ring 18; the dust cover 100 encloses the measuring column 16 and the spring 19; during operation, the dust cover 100 encloses the measuring column 16, intercepting impurities from entering the gap between the expansion ring 18 and the measuring column 16, and by enclosing the measuring column 16 with the dust cover 100, debris and impurities are intercepted from entering the gap between the measuring column 16 and the expansion ring 18, reducing the movement and jamming of the expansion ring 18, reducing the wear caused by impurities entering the gap on the surface of the measuring column 16, and increasing the service life of the measuring column 16.

[0058] Working principle: The fixing plate 15 is placed on the surface of the CNC machine tool machining platform 1, so that the measuring frame 111 is below the tool 14. The spindle assembly 12 is controlled to move on the surface of the support frame 11, so that the tool 14 contacts the top of the measuring frame 111. The tool 14 is controlled to continue to press down, so that the compensation plate 110 contacts the bottom of the fixture 13. At this time, the spring 19 is subjected to the pressure of the expansion ring 18, and it contracts to store pressure. After the compensation plate 110 contacts the bottom of the fixture 13, the spring 19 releases the stored pressure and rebounds, pushing the expansion ring 18 from below, so that the measuring frame 111... The top of the extension ring 18 fits tightly against the cutter 14. Then, observe the corresponding position of the top of the extension ring 18 and the scale line 112 to read the length of the cutter 14. While reading the length of the cutter 14, pull the mounting block 21 to extend the telescopic rod 2. Then, rotate the mounting block 21 and the magnifying glass 22 to adjust the angle so that the center of the magnifying glass 22 magnifies the scale line 112. While reading the length of the cutter 14, rotate the bolt 3 so that its end contacts the surface of the measuring column 16. Continue rotating the bolt 3 so that its end presses against the measuring column 16 to fix the extension ring 18. The felt 4 is placed between the measuring column 16 and... The bolts 3 are positioned between their ends to reduce direct contact between the bolt ends and the measuring column 16. When reading the length of the tool 14, the battery 51 provides current to the lamp 52, causing the lamp 52 to emit light and illuminate the scale line 112. After the tool 14 is pressed down, causing the compensation plate 110 to contact the bottom of the fixture 13, the level 6 is observed to determine whether the measuring frame 111 is in a horizontal position, thus reducing measurement errors. After the magnetic base 7 contacts the surface of the CNC machine tool machining platform 1, the controller 71 is rotated to generate a magnetic field that attracts the magnetic base 7 to the surface of the CNC machine tool machining platform 1. On the surface of the fixed plate 15, when the magnetic base 7 is moved to the surface of the CNC machine tool processing platform 1, the battery 51 provides current to the micro air pump 8, which draws in air from the air inlet 81 and then blows it out from a set of air outlets 82, blowing away impurities at the bottom of the magnetic base 7. Multiple reinforcing columns 9 provide additional support points to the fixed ring 17, increasing the stability of the measuring column 16 and keeping the measuring column 16 perpendicular to the fixed plate 15. The dust cover 100 wraps around the measuring column 16 to intercept impurities from entering the gap where the expansion ring 18 slides with the measuring column 16.

[0059] It should be noted that, for the sake of simplicity, the aforementioned method embodiments are described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously.

[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A length measuring device for a CNC machine tool, comprising a CNC machine tool machining platform (1); a support frame (11) is fixedly connected to the surface of the CNC machine tool machining platform (1); a spindle component (12) is slidably connected to one side of the support frame (11); a clamp (13) is mounted on the bottom of the spindle component (12); a cutting tool (14) is clamped at the bottom of the clamp (13); characterized in that: The CNC machine tool processing platform (1) has a fixed plate (15) on its surface; a measuring column (16) is fixedly connected to the top of the fixed plate (15); a fixed ring (17) is fixedly connected to the surface of the measuring column (16); an extension ring (18) is slidably connected to the surface of the measuring column (16); a spring (19) is fixedly connected between the fixed ring (17) and the extension ring (18); a compensation plate (110) is fixedly connected to the end of the measuring column (16); a measuring frame (111) is fixedly connected to the surface of the extension ring (18); the end of the measuring frame (111) and the top of the compensation plate (110) are horizontally set; a scale line (112) is set on the surface of the measuring column (16); the top of the extension ring (18) and the zero position of the scale line (112) are correspondingly set.

2. The length measuring device for a numerical control machine tool according to claim 1, characterized by: A telescopic rod (2) is fixedly connected to one side of the expansion ring (18); a mounting block (21) is rotatably connected to the telescopic end of the telescopic rod (2); a magnifying glass (22) is rotatably connected to the top of the mounting block (21).

3. The length measuring device for a CNC machine tool according to claim 2, characterized in that: The expansion ring (18) is threaded with a bolt (3) on one side; the bolt (3) is correspondingly set with the measuring frame (111).

4. The length measuring device for a CNC machine tool according to claim 3, characterized in that: The measuring column (16) is fixed with a felt (4); the ends of the felt (4) and the bolt (3) are correspondingly set.

5. The length measuring device for a CNC machine tool according to claim 4, characterized in that: A rectangular groove (5) is provided on one side of the compensation plate (110); a battery (51) is installed in the middle of the rectangular groove (5); a lamp (52) is installed at the bottom of the compensation plate (110); the lamp (52) is electrically connected to the battery (51); the lamp (52) is located on the side near the magnifying glass (22).

6. The length measuring device for a CNC machine tool according to claim 5, characterized in that: A level (6) is fixed inside the measuring frame (111); the level (6) is set on the top of the measuring frame (111).

7. The length measuring device for a CNC machine tool according to claim 6, characterized in that: A magnetic base (7) is installed at the bottom of the fixed plate (15); the magnetic base (7) is set between the CNC machine tool processing platform (1) and the fixed plate (15); a controller (71) is set on one side of the magnetic base (7).

8. The length measuring device for CNC machine tools according to claim 7, characterized in that: A miniature air pump (8) is fixedly connected to one side of the magnetic base (7); the miniature air pump (8) is electrically connected to the battery (51); an air inlet (81) is fixedly connected to one side of the miniature air pump (8); the magnetic base (7) has a cavity inside; a set of air outlets (82) is fixedly connected to the bottom of the magnetic base (7); the air outlets (82) are connected to the miniature air pump (8); the air outlets (82) are inclined.

9. The length measuring device for CNC machine tools according to claim 8, characterized in that: The surface of the fixing plate (15) is fixed with a plurality of reinforcing columns (9); the ends of the reinforcing columns (9) are fixed to the fixing ring (17).

10. The length measuring device for CNC machine tools according to claim 9, characterized in that: A dust cover (100) is fixed between the fixed ring (17) and the expansion ring (18); the dust cover (100) covers the measuring column (16) and the spring (19).

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