A CNC tool holder precision measuring instrument

Abstract

The present invention provides a numerical control tool holder precision measuring instrument, which relates to the technical field of numerical control tool holder measurement; it includes a measurement mounting member, and two elastic support members are mounted on the measurement mounting member; telescopic limit members are respectively mounted on the two elastic support members; the telescopic limit members are used to slide on the numerical control tool holder; a measurement socket is attached to the bottom of the telescopic limit member. The measurement socket is used for one-time measurement of the radial offset and swing error of the floating numerical control tool holder. The measurement data is comprehensive, and at the same time, it does not affect the normal machining work of the tool holder; it solves the problems that the current numerical control tool holder precision measuring instrument is not convenient for one-time measurement of the radial offset and swing error of the floating numerical control tool holder, and it is not convenient to timely know the tool holder error when the numerical control tool holder is in use.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control tool holder measurement, and particularly to a numerical control tool holder precision measuring instrument. Background Art

[0002] The numerical control tool holder plays an important role in numerical control machining. Numerical control machining has requirements for the stiffness, precision, durability, dynamic balance performance, etc. of the tool holder. The precision of the numerical control tool holder is directly related to the machining quality. Among numerical control tool holders, there are also some movable numerical control tool holders, such as numerical control floating tool holders. Its structure can achieve radial displacement and ensure the perpendicularity of the tool holder. Thanks to its self-aligning structure, it can avoid the problem of poor concentricity when the numerical control tool drills holes. However, it also has strict requirements for the movement range precision of the floating tool holder. Because the numerical control floating tool holder uses a non-rigid connection, once problems such as non-compliance of the reset precision of the floating tool holder occur, its machining quality cannot meet the standard either. Currently, the existing numerical control tool holder precision measuring instruments are not convenient for measuring the radial offset and swing error of the floating numerical control tool holder at one time. The measurement is cumbersome and the data is not comprehensive enough. The adaptability to the floating tool holder is poor, and it is not convenient to realize the real-time automatic measurement during the machining process of the tool holder. It is not flexible enough to use, and it is not convenient to know the tool holder error in time when the numerical control floating tool holder is in use. Cutting debris is also likely to affect the measurement accuracy. Summary of the Invention

[0003] An embodiment of the present disclosure relates to a numerical control tool holder precision measuring instrument, which has a measurement socket for measuring the radial offset and swing error of the floating numerical control tool holder at one time. The measurement data is comprehensive. At the same time, it does not affect the normal machining work of the tool holder and production, and can also facilitate the timely display after the precision deviation is found, avoiding too many workpieces with unqualified precision.

[0004] In the first aspect of the present disclosure, a numerical control tool holder precision measuring instrument is provided, which specifically includes a measurement mounting member, on which two elastic support members are mounted; on the two elastic support members, a telescopic limit member is mounted; at the bottom of the telescopic limit member, a measurement socket is attached; the measurement socket is used for measuring the radial offset and swing of the numerical control tool holder; three radial limit members are installed inside the measurement socket; the three radial limit members are used for rolling along the axial direction of the numerical control tool holder in a fitting manner; the three radial limit members are spaced at the same interval; a height measurement device is mounted on the telescopic limit member; the height measurement device is used for measuring the precision of the numerical control tool holder; a limit guide member is fixedly mounted on the measurement socket; the limit guide member is used for guiding chips outwards; the measurement mounting member includes: a measurement clamping block and a digital display controller. There are two measurement clamping blocks, and the two measurement clamping blocks are connected by four bolts; the two measurement clamping blocks are used for clamping and mounting on the numerical control tool holder; a digital display controller is fixedly mounted on the side of the measurement clamping block.

[0005] In at least some embodiments, the height measuring device includes: a height measuring frame and an electronic ruler body, the height measuring frame is fixedly mounted on a measuring mounting plate by bolts; the electronic ruler body is fixedly mounted on the height measuring frame; the measuring end of the electronic ruler body is attached to the top of the measuring shaft; the electronic ruler body is used to measure the precision deviation of the CNC tool holder; and the electronic ruler body is electrically connected to the digital display controller.

[0006] In at least some embodiments, the elastic support member includes: a telescopic rotating arm, a torsion spring shaft and a torsion spring, wherein the telescopic rotating arm is located on the inner side of the telescopic arm; a torsion spring shaft is fixedly installed on the telescopic rotating arm; the torsion spring shaft is rotatably inserted into the end of the telescopic arm; a torsion spring is sleeved on the torsion spring shaft; both ends of the torsion spring are respectively connected between the telescopic arm and the torsion spring shaft; the torsion spring is used for torque control of the outward expansion of the telescopic rotating arm.

[0007] In at least some embodiments, the measuring mounting part further comprises: a telescopic arm, the digital display controller is externally connected to a power supply; two telescopic arms are rotatably mounted on the measuring clamping block; and the digital display controller is used to display the accuracy deviation.

[0008] In at least some embodiments, the telescopic limit member also includes: a measuring shaft and a fit control tension spring, the measuring shaft is slidably inserted in the through hole in the middle of the measuring mounting plate; the bottom of the measuring shaft is a hemispherical structure; a fit control tension spring is sleeved on the measuring shaft; the fit control tension spring is connected between the measuring shaft and the measuring mounting plate; the measuring shaft is used to drive the measuring sleeve to move.

[0009] In at least some embodiments, the measuring sleeve also includes: a protective ring, two of which are provided and fixedly mounted on both sides of the measuring mounting tube; the protective ring is an elastic structure and is used to be sleeved on the outside of the CNC tool handle.

[0010] In at least some embodiments, the radial limit member includes: a limit pressure regulating bolt, a wheel frame and a radial limit roller, wherein the limit pressure regulating bolt is threadedly connected to the measuring mounting tube; a hexagonal groove is provided at the end of the limit pressure regulating bolt; a wheel frame is rotatably mounted on the limit pressure regulating bolt; the wheel frame is slidably mounted inside the measuring mounting tube; two radial limit rollers are rotatably mounted on the wheel frame; both radial limit rollers are arc-shaped structures; rubber coatings are respectively provided on the outer sides of the two radial limit rollers; and the two radial limit rollers are respectively used for rolling and fitting the CNC tool handle.

[0011] In at least some embodiments, the telescopic limit member includes: a measuring mounting plate and a limit frame, wherein both ends of the measuring mounting plate are rotatably mounted on the other ends of the two telescopic rotating arms; the limit frame is installed on the side of the measuring mounting plate by bolts; the limit frame is a "U"-shaped structure; the limit frame is located outside the CNC tool handle; and a through hole is provided in the middle of the measuring mounting plate.

[0012] In at least some embodiments, the limit guide includes: a support column and an inclined surface guide ring. The support column is provided in a circle, and the support columns in a circle are respectively fixedly installed on the side surface of the measurement installation cylinder; an inclined surface guide ring is installed on the support columns in a circle; the outer side of the inclined surface guide ring is an inclined surface structure; the inclined surface structure on the outer side of the inclined surface guide ring is used to prevent chip congestion.

[0013] In at least some embodiments, the measurement socket includes: a measurement installation cylinder and a measurement groove. The measurement groove is opened at the top of the measurement installation cylinder; a measurement shaft is slidably fitted in the measurement groove; the measurement installation cylinder is used to be sleeved outside the numerical control tool shank; the axial two sides of the measurement groove on the measurement installation cylinder are flush end faces, and the radial direction of the measurement groove on the measurement installation cylinder is an arc structure.

[0014] The present invention provides a numerical control tool shank precision measuring instrument, which has the following beneficial effects:

[0015] In the present invention, the radial limiting member is combined with the measurement socket, which can ensure that the structure accurately measures the outside of the tool shank, can measure the radial offset and swing error of the numerical control tool shank at one time, and can also test the reset accuracy of the numerical control floating tool shank after being pressed. The measurement is more comprehensive and more suitable for the measurement work of the numerical control tool shank that is long and easy to deform, and the measurement is efficient.

[0016] In addition, the elastic support member can be telescopically adapted to ensure the measurement of the entire section of the tool shank. By adopting the telescopic movement method, the utilization rate of the numerical control tool shank can be ensured. While ensuring comprehensive measurement, it does not affect the numerical control tool shank from feeding into the workpiece for cutting work, and the telescopically rotating arm and telescopic boom that expand outwards do not affect the normal use length of the numerical control tool shank.

[0017] In addition, by adopting the height measuring device, the detection and prompt work of the dimensional deviation can be carried out quickly, and the measurement can be continuously carried out during the machining process of the numerical control tool shank. When a dimensional deviation occurs, the staff can quickly know. The inclined surface guide ring with an inclined surface structure can be used for chip discharge, and it will not cause blockage between the measurement socket and the workpiece, preventing the accumulated chips from affecting the machining quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0019] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0020] In the drawings:

[0021] Figure 1Shows a schematic diagram of the overall structure of the present application and after the installation of the numerical control tool holder;

[0022] Figure 2 Shows a schematic diagram of the structure of the measurement and installation member of the present application;

[0023] Figure 3 Shows a cross-sectional view of the internal structure of the present application;

[0024] Figure 4 Shows a schematic diagram of the installation position of the measurement shaft of the present application;

[0025] Figure 5 Shows the present application's Figure 2 Enlarged view of area B;

[0026] Figure 6 Shows a schematic diagram of the installation positions of the measurement socket and the numerical control tool holder of the present application;

[0027] Figure 7 Shows the present application's Figure 3 Enlarged view of area D;

[0028] Figure 8 Shows a cross-sectional view of the structure of the height measurement device of the present application;

[0029] Figure 9 Shows a schematic diagram of the structure of the measurement socket of the present application;

[0030] Figure 10 Shows a schematic diagram of the structure of the radial limiting member of the present application.

[0031] List of reference numerals

[0032] 1. Measurement and installation member; 101. Measurement clamping block; 102. Digital display controller; 103. Telescopic boom; 2. Elastic support member; 201. Telescopic and rotating arm; 202. Torsion spring shaft; 203. Torsion spring; 3. Telescopic limiting member; 301. Measurement mounting plate; 302. Limiting frame; 303. Measurement shaft; 304. Fitting control tension spring; 4. Measurement socket; 401. Measurement mounting cylinder; 4011. Measurement groove; 402. Protective ring; 5. Radial limiting member; 501. Limiting pressure regulating bolt; 502. Wheel frame; 503. Radial limiting roller; 6. Height measurement device; 601. Height measurement frame; 602. Main body of electronic ruler; 7. Limiting and guiding member; 701. Support column; 702. Inclined surface guiding ring. Detailed implementation manners

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] Embodiment 1: Please refer to Figures 1 to 10 :

[0035] The present invention provides a numerical control tool holder precision measuring instrument, which includes a measuring and mounting member 1, on which two elastic support members 2 are mounted; on the two elastic support members 2, a telescopic limiting member 3 is mounted; at the bottom of the telescopic limiting member 3, a measuring socket member 4 is attached; the measuring socket member 4 is used to measure the radial offset and swing of the numerical control tool holder; inside the measuring socket member 4, three radial limiting members 5 are mounted; the three radial limiting members 5 are used to fit and roll axially along the numerical control tool holder; the three radial limiting members 5 are equally spaced; on the telescopic limiting member 3, a height measuring device 6 is mounted; the height measuring device 6 is used for the precision measurement of the numerical control tool holder; on the measuring socket member 4, a limiting and guiding member 7 is fixedly mounted; the limiting and guiding member 7 is used to guide the chips outwards; the measuring and mounting member 1 includes: a measuring clamping block 101 and a digital display controller 102. There are two measuring clamping blocks 101, and the two measuring clamping blocks 101 are connected by four bolts; the two measuring clamping blocks 101 are used for clamping and mounting on the numerical control tool holder; on the side of the measuring clamping block 101, a digital display controller 102 is fixedly mounted.

[0036] In an embodiment of the present disclosure, the measurement mounting member 1 further includes: a telescopic boom 103, and the digital display controller 102 is externally powered; two telescopic booms 103 are rotatably mounted on the measurement clamping block 101; the digital display controller 102 is used to display the precision deviation; the elastic support member 2 includes: a telescopic rotating arm 201, a torsion spring shaft 202, and a torsion spring 203, and the telescopic rotating arm 201 is located inside the telescopic boom 103; a torsion spring shaft 202 is fixedly mounted on the telescopic rotating arm 201; the torsion spring shaft 202 is rotatably inserted into the end of the telescopic boom 103; a torsion spring 203 is sleeved on the torsion spring shaft 202; both ends of the torsion spring 203 are respectively connected between the telescopic boom 103 and the torsion spring shaft 202; the torsion spring 203 is used for torque control to expand the telescopic rotating arm 201 outward; the telescopic limiting member 3 includes: a measurement mounting plate 301 and a limiting frame 302, and both ends of the measurement mounting plate 301 are respectively rotatably mounted on the other ends of the two telescopic rotating arms 201; a limiting frame 302 is mounted on the side of the measurement mounting plate 301 by bolts; the limiting frame 302 is of a "U" - shaped structure; the limiting frame 302 is located outside the numerical control tool shank; a through - hole is provided in the middle of the measurement mounting plate 301, and the telescopic limiting member 3 is used in cooperation with the elastic support member 2; the telescopic limiting member 3 further includes: a measurement shaft 303 and a fitting control tension spring 304, and the measurement shaft 303 is slidably inserted into the through - hole in the middle of the measurement mounting plate 301; the bottom of the measurement shaft 303 is of a hemispherical structure; a fitting control tension spring 304 is sleeved on the measurement shaft 303; the fitting control tension spring 304 is connected between the measurement shaft 303 and the measurement mounting plate 301; the measurement shaft 303 is used to push the measurement socket member 4 to move, and the elastic support member 2 can be telescopically adapted to ensure the measurement of the entire section of the tool shank. By adopting the telescopic movement method, the utilization rate of the numerical control tool shank can be ensured. While ensuring comprehensive measurement, it does not affect the numerical control tool shank from feeding into the workpiece for cutting work. At the same time, the measurement mounting method adopted by this structure can perform measurement during the normal cutting process of the numerical control tool shank. The outward - expanding telescopic rotating arm 201 and the telescopic boom 103 will not affect the normal use length of the numerical control tool shank, and it can be better applied to longer numerical control tool shanks. It is also convenient to stop the machine in time for inspection after measuring and finding precision deviation, ensuring that the numerical control tool shank can still be measured during the machining of the workpiece; the limiting frame 302 is used to limit the measurement shaft 303 to prevent the measurement shaft 303 from disengaging from the measurement groove 4011.

[0037] In the embodiments of the present disclosure, the measurement socket 4 includes a measurement mounting cylinder 401 and a measurement groove 4011. The measurement groove 4011 is provided at the top of the measurement mounting cylinder 401. A measurement shaft 303 is slidably fitted in the measurement groove 4011. The measurement mounting cylinder 401 is used to be sleeved outside the CNC tool holder. The axial two sides of the measurement groove 4011 on the measurement mounting cylinder 401 are flush end faces, and the radial direction of the measurement groove 4011 on the measurement mounting cylinder 401 is an arc structure. The measurement socket 4 further includes two protective rings 402, which are respectively fixedly installed on both sides of the measurement mounting cylinder 401. The protective ring 402 is an elastic structure and is used to be sleeved outside the CNC tool holder. The radial limiting member 5 includes a limiting pressure-regulating bolt 501, a wheel frame 502, and a radial limiting roller 503. The limiting pressure-regulating bolt 501 is threadedly connected to the measurement mounting cylinder 401. A hexagonal groove is provided at the end of the limiting pressure-regulating bolt 501. A wheel frame 502 is rotatably installed on the limiting pressure-regulating bolt 501. The wheel frame 502 is slidably installed inside the measurement mounting cylinder 401. Two radial limiting rollers 503 are rotatably installed on the wheel frame 502. Both of the two radial limiting rollers 503 are arc structures. Rubber coatings are respectively provided on the outer sides of the two radial limiting rollers 503. The two radial limiting rollers 503 are respectively used to roll and fit the CNC tool holder. By using the radial limiting member 5 in cooperation with the measurement socket 4, it can ensure that this structure can accurately measure the outside of the tool holder, and can measure the radial offset and swing error of the CNC tool holder at one time. Among them, the radial swing is the radial load generated on the tool holder when the workpiece is driven to rotate by the CNC machine tool. Especially for a tool holder composed of two parts of a floating tool holder, the end of it is easily squeezed by the workpiece to cause radial rotation or distortion. The swing error is that when the concentric deviation between the machining hole of the workpiece and the tool holder is too large and exceeds the correctable range, it will cause the non-concentric rotation of the tool holder by the machining hole, driving the end of the tool holder to appear rotational swing instead of straight drilling, resulting in a large deviation in the overall coaxiality of the tool holder;At the same time, the present structure can test the reset accuracy of the CNC floating tool holder after being pressed, and the measurement is more comprehensive, more suitable for the measurement of longer and easily deformed CNC tool holders, and the measurement is efficient. The radial limit roller 503 can be radially limited for the CNC tool holder, which can facilitate the height measuring device 6 to accurately test the radial offset error of the CNC tool holder, and at the same time does not affect the axial rolling displacement of the radial limit roller 503 along the CNC tool holder, and adapts to the switching of the measuring position. When the limit guide 7 is moved by the workpiece, the measuring slot 4011 can move the measuring axis 303 along the axial direction of the CNC tool holder, driving the measuring mounting plate 301 to move. This process does not affect the elevation of the measuring axis 303. At the same time, once the CNC tool holder rotates radially, If the CNC tool holder is offset, or the CNC tool holder swings and deviates radially, it means that the radial deviation of the floating tool holder is large. At this time, the radial limiting roller 503 is radially close to the CNC tool holder for limiting. When the CNC tool holder is damaged and rotates radially, the measuring installation cylinder 401 is driven by the radial limiting roller 503 to rotate or swing at the same time, so that the measuring slot 4011 is controlled to push the measuring shaft 303 with the bottom arc structure, and the height measuring device 6 can be used for measuring. The measuring slot 4011 is used, and its bottom arc structure can be used to limit the measuring shaft 303. When the size of the CNC tool holder is accurate, under the torsion of two identical torsion springs 203, the limiting measuring shaft 303 is located in the middle of the measuring slot 4011. ;

[0038] In the disclosed embodiment, the height measuring device 6 includes: a height measuring frame 601 and an electronic ruler body 602. The electronic ruler body 602 can adopt a MNSDVH20 displacement sensor and its matching digital display controller 102. The height measuring frame 601 is fixedly mounted on the measuring mounting plate 301 by bolts; the electronic ruler body 602 is fixedly mounted on the height measuring frame 601; the measuring end of the electronic ruler body 602 is attached to the top of the measuring shaft 303; the electronic ruler body 602 is used to measure the accuracy deviation of the CNC tool holder; the electronic ruler body 602 is electrically connected to the digital display controller 102. By adopting the height measuring device 6, the dimensional deviation can be detected and prompted quickly, and the measurement can be continued during the machining process of the CNC tool holder. When the dimensional deviation occurs, the staff can quickly know it, so as to avoid the continuous use of the CNC tool holder with dimensional accuracy deviation to cause economic losses.

[0039] Embodiment 2. On the basis of Embodiment 1, the limit guiding member 7 includes: a support column 701 and an inclined surface guiding ring 702. There is a circle of support columns 701, and the circle of support columns 701 are respectively fixedly installed on the side surface of the measuring installation cylinder 401; an inclined surface guiding ring 702 is installed on the circle of support columns 701; the outer side of the inclined surface guiding ring 702 is an inclined surface structure; the inclined surface structure on the outer side of the inclined surface guiding ring 702 is used to prevent chip congestion. By using the limit guiding member 7, during the machining process of the CNC tool holder, the position of the measuring socket 4 can be adjusted and adapted by fitting the inclined surface guiding ring 702 to the workpiece, avoiding interference of the measuring socket 4 with the machining. At the same time, the inclined surface guiding ring 702 with an inclined surface structure can be used for chip discharge, preventing chips from clogging between the measuring socket 4 and the workpiece, and preventing the accumulated chips from affecting the machining quality. At the same time, the protective ring 402 can be sleeved outside the CNC tool holder to scrape impurities such as cutting fluid in real time, avoiding the influence of impurities on the radial anti-slip effect and axial rolling smoothness of the radial limit roller 503.

[0040] Working principle of this embodiment: First, two measuring clamping blocks 101 are sleeved on the floating tool shank and connected by four bolts. With the torsion applied by two torsion springs 203, the telescopic rotating arm 201 can be driven to rotate, pushing the measuring mounting plate 301 to elastically move outward to achieve adaptation to the longest measuring distance. During the machining process when the tool tip of the CNC tool shank contacts the workpiece, as the tool shank extends, the limit guiding member 7 can be attached to the workpiece. As the CNC tool shank continues to feed forward, the inclined surface guiding ring 702 with an inclined surface structure can be used for chip discharge, and at the same time, it drives the measuring mounting plate 301 to move inward. The two telescopic rotating arms 201 will also be squeezed to expand outward to adapt to the measuring position of the measuring socket 4. The protective ring 402 can be sleeved outside the CNC tool shank to scrape impurities such as cutting fluid in real time. The measuring groove 4011 can deflect the measuring shaft 303 to drive the measuring mounting plate 301 to move. This process does not affect the elevation of the measuring shaft 303. At the same time, once the CNC tool shank rotates radially or swings radially, it means that the radial deviation of the floating tool shank is relatively large. At this time, the radial limit roller 503 is radially closely attached to the CNC tool shank. When the CNC tool shank rotates, it drives the measuring mounting cylinder 401 to rotate at the same time, realizing the control that when the measuring groove 4011 rotates using the bottom arc structure, it squeezes the arranged extrusion measuring shaft 303 to rise. When the limit measuring shaft 303 is squeezed by the measuring groove 4011, it can be adapted to rise and fit inside the measuring groove 4011 by cooperating with the pulling of the fitting control tension spring 304. At this time, the electronic scale main body 602 can detect the deviation data, and the digital display controller 102 can display the data in real time. It can also measure when the perpendicularity of the CNC tool shank does not meet the standard and swings. At this time, the measuring groove 4011 will also squeeze the limit measuring shaft 303 for detection work. Similarly, the electronic scale main body 602 can also measure the data deviation. At the same time, when the CNC floating tool shank is deformed or cannot be reset, the height measuring device 6 can be attached to the limit measuring shaft 303 for dimension measurement, facilitating the height measuring device 6 to detect the data deviation. The staff can observe the digital display controller 102. This structure is more suitable for the measurement of non-rigidly connected tool shanks such as CNC floating tool shanks, and can more timely detect the precision deviation of the tool shank.

[0041] In this article, the following points need to be noted:

[0042] 1. The attached drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0043] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0044] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A CNC tool handle accuracy measuring instrument, comprising a measuring mounting member (1), wherein two elastic supporting members (2) are mounted on the measuring mounting member (1); characterized in that: A telescopic limiting member (3) is installed on the two elastic supporting members (2); A measuring sleeve (4) is attached to the bottom of the telescopic limiter (3); the measuring sleeve (4) is used to measure the radial offset and swing of the CNC tool holder; Three radial stoppers (5) are installed inside the measuring sleeve (4); the three radial stoppers (5) are used to fit the axial rolling of the CNC tool handle; the three radial stoppers (5) are spaced at the same interval; A height measuring device (6) is installed on the telescopic limiter (3); the height measuring device (6) is used for measuring the accuracy of a CNC tool handle; A limit guide (7) is fixedly mounted on the measuring sleeve (4); the limit guide (7) is used to guide chips outwards; The measuring mounting member (1) comprises: a measuring clamping block (101), a digital display controller (102) and a telescopic arm (103); two measuring clamping blocks (101) are provided, and the two measuring clamping blocks (101) are connected by four bolts; the two measuring clamping blocks (101) are used for clamping and mounting on a CNC tool handle; the digital display controller (102) is fixedly mounted on the side of the measuring clamping block (101); The elastic support member (2) comprises: a telescopic rotating arm (201), a torsion spring shaft (202) and a torsion spring (203); the telescopic rotating arm (201) is located inside the telescopic large arm (103); the torsion spring shaft (202) is fixedly mounted on the telescopic rotating arm (201); the torsion spring shaft (202) is rotatably plugged into the end of the telescopic large arm (103); the torsion spring (203) is sleeved on the torsion spring shaft (202); the two ends of the torsion spring (203) are respectively connected between the telescopic large arm (103) and the torsion spring shaft (202); the torsion spring (203) is used for torque control of the outward expansion of the telescopic rotating arm (201); The telescopic limiting member (3) comprises: a measuring installation plate (301), wherein a through hole is provided in the middle of the measuring installation plate (301); The telescopic limiter (3) further comprises: a measuring shaft (303) and a fitting control tension spring (304); the measuring shaft (303) is slidably inserted into a through hole in the middle of the measuring mounting plate (301); the bottom of the measuring shaft (303) is a hemispherical structure; the measuring shaft (303) is sleeved with a fitting control tension spring (304); the fitting control tension spring (304) is connected between the measuring shaft (303) and the measuring mounting plate (301); the measuring shaft (303) is used to move the measuring sleeve (4); The measuring sleeve (4) comprises: a measuring installation cylinder (401) and a measuring groove (4011); the measuring installation cylinder (401) is provided with a measuring groove (4011) at the top; a measuring shaft (303) is slidably fitted in the measuring groove (4011); the measuring installation cylinder (401) is used to be sleeved on the outside of a numerical control tool handle; the measuring groove (4011) on the measuring installation cylinder (401) has flush end surfaces on both axial sides, and the measuring groove (4011) on the measuring installation cylinder (401) is an arc-shaped structure in the radial direction.

2. A CNC tool handle precision measuring instrument according to claim 1, characterized in that: The digital display controller (102) is externally connected to a power supply; two telescopic arms (103) are rotatably mounted on the measuring clamping block (101); and the digital display controller (102) is used to display the accuracy deviation.

3. The CNC tool handle precision measuring instrument according to claim 1, characterized in that: The telescopic limit member (3) further comprises: a limit frame (302), wherein both ends of the measuring mounting plate (301) are rotatably mounted on the other ends of the two telescopic rotating arms (201); the limit frame (302) is mounted on the side of the measuring mounting plate (301) by means of bolts; the limit frame (302) is a "U"-shaped structure; and the limit frame (302) is located outside the CNC tool handle.

4. The CNC tool handle precision measuring instrument according to claim 1, characterized in that: The measuring sleeve (4) further comprises: a protective ring (402), two protective rings (402) are provided, and the two protective rings (402) are respectively fixedly mounted on two sides of the measuring mounting tube (401); the protective ring (402) is an elastic structure, and the protective ring (402) is used to be sleeved on the outside of the CNC tool handle.

5. The CNC tool handle precision measuring instrument according to claim 1, characterized in that: The radial limiting member (5) comprises: a limiting pressure regulating bolt (501), a wheel frame (502) and a radial limiting roller (503); the limiting pressure regulating bolt (501) is threadedly connected to the measuring installation tube (401); a hexagonal groove is provided at the end of the limiting pressure regulating bolt (501); a wheel frame (502) is rotatably mounted on the limiting pressure regulating bolt (501); the wheel frame (502) is slidably mounted inside the measuring installation tube (401); two radial limiting rollers (503) are rotatably mounted on the wheel frame (502); both radial limiting rollers (503) are of arc-shaped structure; rubber coatings are respectively provided on the outer sides of the two radial limiting rollers (503); and the two radial limiting rollers (503) are respectively used for rolling and fitting the CNC tool handle.

6. The CNC tool handle precision measuring instrument according to claim 2, characterized in that: The height measuring device (6) comprises: a height measuring frame (601) and an electronic ruler body (602); the height measuring frame (601) is fixedly mounted on a measuring mounting plate (301) by means of bolts; the electronic ruler body (602) is fixedly mounted on the height measuring frame (601); the measuring end of the electronic ruler body (602) is attached to the top of a measuring shaft (303); the electronic ruler body (602) is electrically connected to a digital display controller (102); and the electronic ruler body (602) is used to measure the precision deviation of a CNC tool holder.

7. The CNC tool handle precision measuring instrument according to claim 1, characterized in that: The position limiting guide (7) comprises: a support column (701) and a bevel guide ring (702); the support column (701) is provided with a circle, and the circle of support columns (701) are respectively fixedly mounted on the side of the measuring mounting tube (401); the bevel guide ring (702) is mounted on the circle of support columns (701); the outer side of the bevel guide ring (702) is a bevel structure; the outer bevel structure of the bevel guide ring (702) is used to prevent chip congestion.

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