阅读说明：本技术 一种电感式的无线球杆仪 (Inductive wireless ball arm instrument ) 是由 黄庭总 张和君 吴兴发 陈源 于 2020-06-17 设计创作，主要内容包括：本发明提供了一种电感式的无线球杆仪,该电感式的无线球杆仪主要由球杆仪主机、中心支座组件、中心杯组件和设定球组件四部分组成；所述的球杆仪主机包括电感测头组件、电池组件、电路板组件和球杆仪主体。由球杆仪主机、中心支座和中心杯组件组成的无线测量系统,用于综合检测CNC机床运动轴的精度。本发明操作简单、精度高、成本低,能快速检测CNC机床运动轴精度。(The invention provides an inductive wireless ball arm instrument which mainly comprises a ball arm instrument host, a central support component, a central cup component and a setting ball component; the ball arm instrument host comprises an inductance measuring head component, a battery component, a circuit board component and a ball arm instrument main body. The wireless measuring system consists of a ball arm instrument host, a central support and a central cup component and is used for comprehensively detecting the precision of the motion axis of the CNC machine tool. The method has the advantages of simple operation, high precision and low cost, and can quickly detect the precision of the motion shaft of the CNC machine tool.)

1. An inductance type wireless ball arm instrument is characterized in that:

the inductive wireless ball bar instrument mainly comprises a ball bar instrument host (100), a central support assembly (200), a central cup assembly (300) and a setting ball assembly (400);

the ball arm instrument main machine (100) comprises an inductance measuring head component, a battery component, a circuit board component and a ball arm instrument main body (5); the measuring device also comprises a measuring ball connecting rod (13) movably connected with the battery component, and a second measuring ball (12) connected with the measuring ball connecting rod (13); the inductance measuring head component comprises a first measuring ball (1), a measuring rod (2), a measuring head main body (3), a guide sleeve (4), a magnetic core loop bar (8), a magnetic core (16), a coil (17), a return spring (18) and a pin (19); the circuit board assembly comprises a circuit board (7);

the first measuring ball (1) is arranged at the first end of the measuring rod (2), the guide sleeve (4) is sleeved on the measuring rod (2), the pin (19) is inserted into the measuring rod (2), the position of the pin (19) is close to the second end of the measuring rod (2), the measuring head main body (3), the guide sleeve (4) and the pin (19) form a precise kinematic pair, the pin (19) moves in a waist-shaped hole in the measuring head main body (3) along with the measuring rod (2), and the pin (19) is tightly matched with the waist-shaped hole;

the magnetic core loop bar (8) is fixedly connected with the second end of the measuring rod (2) and moves along with the measuring rod (2), and the magnetic core (16) is arranged in the magnetic core loop bar (8); when the measuring rod (2) is compressed, the return spring (18) is also compressed; when the measuring rod (2) is released, the reset spring (18) can push the measuring rod (2) to move outwards until the measuring rod extends outwards to the limit position; the circuit board (7) is fixed on the cue instrument main body (5), and the grounding end of the circuit board is communicated with the cue instrument main body (5); the Bluetooth transmitter on the circuit board (7) transmits the displacement signal of the inductance measuring head component to a computer; one end of the battery component is connected with the circuit board (7), and the other end of the battery component is connected with the ball arm instrument main body (5);

the center pedestal assembly (200) includes: the device comprises a measuring ball supporting block (20), a magnet (21), a movable supporting rod (22), an elastic claw (23), a conical limiting sleeve (24), a cam rod (25), a spring (26), an adjusting end cover (27), a handle (28), a return spring (29), an upper cushion block (30), a base (31) and a base magnet (32);

the measuring ball support block (20) and the magnet (21) are fixedly arranged at the upper end of the movable support rod (22), and a circle of or a plurality of arc bosses are uniformly distributed on the measuring ball support block (20);

the lower end of the movable supporting rod (22) is of a structure similar to a sphere and is arranged in the middle of the clamping jaw of the elastic clamping jaw (23), when the cam rod (25) is in a loosening state, the movable supporting rod (22) freely swings or moves up and down in the middle of the clamping jaw, and when the cam rod (25) is in a locking state, the movable supporting rod (22) is firmly clamped by the clamping jaw and cannot freely move;

the middle of the elastic claw (23) is provided with a through hole for mounting a cam rod (25), two ends of the cam rod (25) are in contact with an upper cushion block (30), a spring (26) and an adjusting end cover (27) are sequentially arranged below the upper cushion block (30), the adjusting end cover (27) is connected with a conical limiting sleeve (24), when the adjusting end cover (27) is screwed inwards, the spring (26) is compressed, the spring elasticity pushes the upper cushion block (30) to press the cam rod (25), when the handle (28) is in a vertical state, the cam rod (25) is located at the lowest part of a cam stroke, at the moment, the movable support rod (22) freely moves in the middle of the elastic claw (23), when the handle (28) is pulled to a horizontal state, the cam rod (25) is located at the highest part of the cam stroke, at the moment, the elastic claw (23) is extruded into a conical surface in the conical limiting sleeve (24) to generate elastic deformation, the movable support rod (22) is clamped to be fixed at one position, and the elastic clamping jaw (23) is fixedly connected with the base (31);

the centercup assembly (300) includes: a measuring ball support block (20), a magnet (21) and a central cup support rod (33);

the measuring ball support block (20) and the magnet (21) are fixedly arranged at one end of the central cup support rod (33), the end is used for sucking the second measuring ball (12) during measurement and ensuring that the position of the center of the measuring ball does not change during measurement, and the other end of the central cup support rod (33) is used for clamping on the CNC spindle;

the setting ball assembly (400) includes: a setting ball (34) and a setting ball handle (35);

the setting ball (34) and two measuring balls on the ball rod instrument host have the same size specification and precision grade, and the setting ball (34) is fixedly connected with a setting ball handle (35).

2. The inductive wireless cue stick apparatus of claim 1, wherein: the battery component comprises a battery positive electrode guide sheet (9), a battery (10), a battery end cover (11), an elastic sheet (14) and a battery negative electrode elastic sheet (15); the battery anode guide sheet (9) is connected with the circuit board through a lead, the battery end cover (11) is connected with the external thread at one end of the ball arm instrument main body (5) through an internal thread, and the battery cathode elastic sheet (15) and the elastic sheet (14) are always kept in reliable contact and electric conduction; before the battery end cover (11) is screwed to the club instrument main body (5), the elastic sheets (14) are not in contact with the battery end cover (11) and the club instrument main body (5), and the club instrument is in a power-off state; when the battery end cover (11) is screwed to the ball arm instrument main body (5), the end part of the ball arm instrument main body (5) props against the elastic sheet (14), meanwhile, the battery cathode elastic sheet (15) props against the battery cathode, the battery is pressed towards the battery anode guide sheet (9), the battery is conducted at the moment, and the ball arm instrument is in a power-on state.

3. The inductive wireless cue stick apparatus of claim 2, wherein: circuit board (7) pass through screw fixed mounting on club appearance main part (5), and the earthing terminal of circuit board switches on with club appearance main part (5), is connected through the wire between the power pin of circuit board and battery positive pole guide piece (9), and when the battery switched on, the bluetooth transmitter on the circuit board sent the displacement signal of measuring stick to the computer on.

4. The inductive wireless cue stick apparatus of claim 2, wherein: the ball arm instrument is characterized in that the circuit board assembly further comprises a circuit board cover plate (6), the ball arm instrument main body (5) is made of metal materials in a machining mode, the inductance measuring head assembly and the battery end cover are connected with the ball arm instrument main body through threads, and the circuit board cover plate (6) is connected with the ball arm instrument main body (5) through screws.

5. The inductive wireless cue stick apparatus of claim 1, wherein: three circular arc bosses are uniformly distributed on the measuring ball supporting block (20).

6. The inductive wireless cue stick apparatus of claim 1, wherein: the adjusting end cover (27) is connected with the conical limiting sleeve (24) through threads.

7. The inductive wireless cue stick apparatus of claim 1, wherein: and a base magnet (32) is arranged at the bottom of the base (31) and is used for adsorbing and fixing the central support component on the measured platform.

Technical Field

The invention relates to the field of error measurement of circular motion tracks of numerical control machines.

Background

CNC machine tools play a very important role in modern machining technology, and the accuracy of the machine tool determines the accuracy of the machined part. If the accuracy of the machine tool can be determined to meet the index requirement before the part is machined, the generation of reported waste can be avoided, and therefore, large economic loss is avoided. Laser interferometers can be used to detect and compensate for the accuracy of the machine tool motion axes, but are time consuming. In actual production, a machining worker only needs to know whether the machine tool precision meets the requirement or not, and does not need to compensate the machine tool precision. It is therefore necessary to have a device for rapidly detecting the accuracy of the machine tool. The ball bar instrument is used for comprehensively detecting the precision of the motion axis of the CNC machine tool.

At present, some manufacturers and scientific research institutes in China make grating type ball bar instruments, such as joint type retractable ball bar instruments of the science and technology limited company of Wan Jiu of Xiamen, space two-link ball bar instruments of Hangzhou electronic science and technology university, double grating type ball bar instruments of the mechanical research and manufacturing process research institute of Chinese engineering physical research institute, and the like, although the grating type ball bar instruments have characteristics, the double grating structure is complex, and the cost is higher. The ball rod instrument of the API and the Renysha company exists abroad, and is also of a grating type, so that the volume is larger and the cost is higher. Renisrah is inductive, which has a relatively large share in the market, but a relatively high price. What is needed for the vast machine tool manufacturing enterprises or machining enterprises is a ball rod instrument which is high in measuring efficiency, convenient to maintain, low in cost and low in precision meeting requirements.

Disclosure of Invention

The invention provides an inductance type wireless ball arm instrument which is simple to operate, high in precision, low in cost and capable of quickly detecting the precision of a motion shaft of a CNC (computer numerical control) machine tool, and mainly comprises a ball arm instrument host, a central support assembly, a central cup assembly and a setting ball assembly;

the ball arm instrument host comprises an inductance measuring head component, a battery component, a circuit board component and a ball arm instrument main body; the measuring ball connecting rod is movably connected with the battery component, and the second measuring ball is connected with the measuring ball connecting rod; the inductance measuring head assembly comprises a first measuring ball, a measuring rod, a measuring head main body, a guide sleeve, a magnetic core sleeve rod, a magnetic core, a coil, a reset spring and a pin; the circuit board assembly includes a circuit board;

the first measuring ball is arranged at the first end of the measuring rod I, the guide sleeve is sleeved on the measuring rod, the pin is inserted into the measuring rod, the position of the pin is close to the second end of the measuring rod, the measuring head main body, the guide sleeve and the pin form a precise kinematic pair, the pin moves in the waist-shaped hole in the measuring head main body along with the measuring rod, and the pin is tightly matched with the waist-shaped hole;

the magnetic core loop bar is fixedly connected with the second end of the measuring bar and moves along with the measuring bar, and the magnetic core is arranged in the magnetic core loop bar; when the measuring rod is compressed, the return spring is also compressed; when the measuring rod is loosened, the reset spring can push the measuring rod to move outwards until the measuring rod extends outwards to the limit position; the circuit board is fixed on the cue instrument main body, and the grounding end of the circuit board is communicated with the cue instrument main body; the Bluetooth transmitter on the circuit board transmits the displacement signal of the inductance measuring head component to a computer; one end of the battery component is connected with the circuit board, and the other end of the battery component is connected with the ball arm instrument main body;

the center support assembly includes: the device comprises a measuring ball supporting block, a magnet, a movable supporting rod, an elastic clamping jaw, a conical limiting sleeve, a cam rod, a spring, an adjusting end cover, a handle, a return spring, an upper cushion block, a base and a base magnet;

the measuring ball support block and the magnet are fixedly arranged at the upper end of the movable support rod, and a circle of or a plurality of arc bosses are uniformly distributed on the measuring ball support block;

the lower end of the movable supporting rod is of a structure similar to a sphere and is arranged in the middle of the clamping jaw of the elastic clamping jaw, when the cam rod is in a loosening state, the movable supporting rod freely swings or moves up and down in the middle of the clamping jaw, and when the cam rod is in a locking state, the movable supporting rod is firmly clamped by the clamping jaw and cannot freely move;

the middle of the elastic claw is provided with a through hole for mounting a cam rod, two ends of the cam rod are in contact with the upper cushion block, a spring and an adjusting end cover are sequentially arranged below the upper cushion block, the adjusting end cover is connected with the conical limiting sleeve, when the adjusting end cover is screwed inwards, the spring is compressed, the spring pushes the upper cushion block to press the cam rod tightly, when the handle is in a vertical state, the cam rod is located at the lowest position of the cam stroke, the movable supporting rod freely moves in the middle of the elastic claw, when the handle is pulled to a horizontal state, the cam rod is located at the highest position of the cam stroke, the elastic claw is extruded into a conical surface in the conical limiting sleeve, the claw is elastically deformed and clamps the movable supporting rod, so that the movable supporting rod is fixed at one position, and the elastic claw is fixedly connected;

the center cup assembly includes: a measuring ball support block, a magnet and a central cup support rod;

the measuring ball support block and the magnet are fixedly arranged at one end of the central cup support rod, the end is used for sucking a second measuring ball during measurement and ensuring that the position of the center of the measuring ball is not changed during measurement, and the other end of the central cup support rod is used for clamping on the CNC main shaft;

the setting ball assembly includes: a setting ball and a setting ball handle;

the setting ball is the same with two measuring balls on the ball rod instrument main machine in size specification and precision grade, and the setting ball is fixedly connected with a setting ball handle.

As a further improvement of the invention, the battery assembly comprises a battery anode guide sheet, a battery end cover, an elastic sheet and a battery cathode elastic sheet; the battery anode guide sheet is connected with the circuit board through a lead, the battery end cover is connected with the external thread at one end of the ball arm instrument main body through an internal thread, and the battery cathode elastic sheet and the elastic sheet are always kept in reliable contact and electric conduction; before the battery end cover is screwed to the ball arm instrument main body, the elastic sheets are not in contact with the battery end cover and the ball arm instrument main body, and the ball arm instrument is in a power-off state; when screwing the battery end cover to the ball arm instrument main body, the end part of the ball arm instrument main body props against the elastic sheet, meanwhile, the battery cathode elastic sheet props against the battery cathode, the battery is compressed towards the battery anode guide sheet, the battery is conducted at the moment, and the ball arm instrument is in a power-on state.

As a further improvement of the invention, the circuit board is fixedly arranged on the ball bar instrument main body through screws, the grounding end of the circuit board is conducted with the ball bar instrument main body, the power pin of the circuit board is connected with the battery anode guide sheet through a lead, and when the battery is conducted, the Bluetooth emitter on the circuit board sends the displacement signal of the measuring rod to the computer.

As a further improvement of the invention, the circuit board assembly further comprises a circuit board cover plate, the ball bar instrument main body is processed by metal materials, the inductance measuring head assembly and the battery end cover are connected with the ball bar instrument main body through threads, and the circuit board cover plate is connected with the ball bar instrument main body through screws.

As a further improvement of the invention, three circular arc bosses are uniformly distributed on the measuring ball supporting block.

As a further improvement of the invention, the adjusting end cover is connected with the conical limiting sleeve through threads.

As a further improvement of the invention, the bottom of the base is provided with a base magnet which is used for fixing the central support component on the platform to be tested in an adsorption manner.

The invention has the beneficial effects that:

the wireless measuring system consists of a ball arm instrument host (comprising a wireless transmitting device), a central support and a central cup component and is used for comprehensively detecting the precision of a CNC machine tool motion axis;

the guiding mode of the inductance measuring head measuring rod is as follows: the precision kinematic pair consisting of the measuring rod 2, the guide sleeve 4, the measuring head main body 3 and the pin 19 ensures the running precision of the measuring rod, and the pin 19 ensures that the measuring rod cannot rotate in the running process; the ball arm instrument inductance measuring head has reliable guiding, the precision can meet the use requirement, and the measuring efficiency is high;

mounting manner of battery 10: the positive pole of the battery is in rigid contact with the positive pole guide sheet 9 of the battery, and the negative pole is in elastic contact with the negative pole elastic sheet 15 of the battery, so that the reliability of the battery installation is ensured; the elastic function of the battery cathode elastic sheet 15 is realized by making a metal piece into a flexible hinge; the battery mounting structure is simple and compact, and the mounting is reliable;

the installation mode of the cue instrument signal transmitting device is as follows: the Bluetooth emitter is arranged in the club instrument main body 5 along with the circuit board 7, and the circuit board cover plate is made of non-metal materials so as to ensure that Bluetooth signals can be effectively transmitted to a computer;

clamping of the central support mobile strut 22: the structure of the central movable supporting rod 22 is that the upper end is a straight rod, the top end of the straight rod is a magnetic base device, and the lower end of the supporting rod is provided with a hemispherical structure, which is equivalent to a spherical hinge structure. When the cam rod 25 is positioned at the highest stroke, the elastic claw 23 is pushed into a conical surface in the conical limiting sleeve under the action of the elastic force of the spring 26, the hemispherical part of the movable support rod 22 is clamped, and the position of the support rod is fixed; when the cam rod 25 is at the lowest stroke, the elastic claw 23 is pushed out of the conical surface in the conical limiting sleeve under the action of the return spring 26, the hemispherical part of the movable supporting rod 22 is released, and the supporting rod can freely swing or move up and down in the middle of the elastic claw 23. The central support has small volume and is convenient to carry, and the movable support rod is convenient and reliable to clamp;

the structure is simple, and the installation and the maintenance are easy; the cost is low.

Drawings

FIG. 1: setting a use schematic diagram of a ball assembly;

FIG. 2: schematic clamping and measuring diagram of a ball arm instrument;

FIG. 3: a perspective view of the club instrument host;

FIG. 4: a section view of the ball arm instrument main machine;

FIG. 5: fig. 4 is an enlarged view of the right side of the battery pack;

FIG. 6: explosion diagram of the main machine of the cue instrument;

FIG. 7: a perspective view of a central support assembly;

FIG. 8: a cross-sectional view of the central support assembly;

FIG. 9: an exploded view of the central support assembly;

FIG. 10: the movable supporting rod and the measuring ball supporting block are enlarged;

FIG. 11: a schematic view of a central cup assembly;

FIG. 12: a schematic view of a set ball assembly.

The names of the components in the figure are as follows:

the ball rod instrument comprises a ball rod instrument host 100, a center support assembly 200, a center cup assembly 300, a setting ball assembly 400, a CNC spindle 500, a first measuring ball 1, a measuring rod 2, a measuring head main body 3, a guide sleeve 4, a ball rod instrument main body 5, a circuit board cover plate 6, a circuit board 7, a magnetic core loop bar 8, a battery positive pole guide sheet 9, a battery 10, a battery end cover 11, a second measuring ball 12, a measuring ball connecting rod 13, an elastic sheet 14, a battery negative pole elastic sheet 15, a magnetic core 16, a coil 17, a return spring 18, a pin 19, a measuring ball supporting block 20, a magnet 21, a movable supporting rod 22, an elastic clamping jaw 23, a conical limiting sleeve 24, a cam rod 25, a spring 26, an adjusting end cover 27, a handle 28, a return spring 29, an upper cushion block 30, a base 31, a base magnet 32, a center cup supporting rod 33.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the inductive wireless ball bar apparatus mainly comprises a ball bar apparatus main body 100, a center support assembly 200, a center cup assembly 300 and a setting ball assembly 400.

As shown in fig. 3 to 6, the club instrument main body 100 includes: the measuring device comprises a first measuring ball 1, a measuring rod 2, a measuring head main body 3, a guide sleeve 4, a ball rod instrument main body 5, a circuit board cover plate 6, a circuit board 7, a magnetic core loop bar 8, a battery positive pole guide sheet 9, a battery 10, a battery end cover 11, a second measuring ball 12, a measuring ball connecting rod 13, an elastic sheet 14, a battery negative pole elastic sheet 15, a magnetic core 16, a coil 17, a reset spring 18 and a pin 19.

As shown in fig. 7 to 10, the center stand assembly 200 includes: the device comprises a measuring ball support block 20, a magnet 21, a movable support rod 22, an elastic claw 23, a conical limiting sleeve 24, a cam rod 25, a spring 26, an adjusting end cover 27, a handle 28, a return spring 29, an upper cushion block 30, a base 31 and a base magnet 32.

As shown in fig. 11, the centercup assembly 300 includes: measurement ball support 20, magnet 21, central cup support 33.

As shown in fig. 12, the setting ball assembly 400 includes: a setting ball 34 and a setting ball handle 35.

The technical scheme of the invention is elaborated as follows:

1) ball arm instrument main unit 100

The ball arm instrument host comprises an inductance measuring head component, a battery component, a circuit board component and a ball arm instrument main body.

The inductance measuring head component comprises a first measuring ball 1, a measuring rod 2, a measuring head main body 3, a guide sleeve 4, a magnetic core loop bar 8, a magnetic core 16, a coil 17, a return spring 18 and a pin 19.

The inductance measuring head component is characterized in that a measuring rod 2, a measuring head main body 3, a guide sleeve 4 and a pin 19 form a precise kinematic pair, the guide is reliable, and the motion precision of the measuring rod is ensured. The pin 19 moves in the kidney-shaped hole of the measuring head main body 3 along with the measuring rod 2, and the fit clearance with the kidney-shaped hole is very small, namely, the pin is tightly matched, so that the effective stroke of the measuring rod is limited, and the measuring rod is ensured not to rotate in the operation process.

The magnetic core loop bar 8 is fixedly connected with the measuring bar 2 and moves along with the measuring bar. The magnetic core 16 is arranged in the magnetic core loop bar 8.

When the measuring rod 2 is compressed, the return spring 18 is also compressed; when the measuring staff 2 is released, the return spring 18 will push the measuring staff 2 outwards until the extreme position where the measuring staff extends outwards.

The battery component comprises a battery positive electrode guide sheet 9, a battery 10, a battery end cover 11, an elastic sheet 14 and a battery negative electrode elastic sheet 15.

The battery pack is characterized in that a battery positive electrode guide sheet 9 is connected with a circuit board through a lead, a battery end cover 11 is connected with an external thread at one end of a ball rod instrument main body 5 through an internal thread, and a battery negative electrode elastic sheet 15 and an elastic sheet 14 are always kept in reliable contact and electric conduction.

The circuit board is fixed on the cue stick instrument main body 5, and the grounding end of the circuit board is conducted with the cue stick instrument main body 5. The bluetooth transmitter on the circuit board sends the displacement signal of inductance gauge head to the computer, for computer software to carry out the analysis to measured data.

Before the battery end cover 11 is screwed to the club instrument main body 5, the elastic sheets 14 are not in contact with the battery end cover 11 and the club instrument main body 5, and at the moment, the club instrument is in a power-off state. When the battery end cover 11 is screwed to the ball arm instrument main body 5, the end part of the ball arm instrument main body 5 props against the elastic sheet 14, meanwhile, the battery cathode elastic sheet 15 props against the battery cathode, the battery is tightly pressed towards the battery anode guide sheet 9, the battery is conducted at the moment, and the ball arm instrument is in a power-on state.

The measuring ball connecting rod 13 is in threaded connection with the battery end cover 11. The second measuring ball 12 is fixedly connected with a measuring ball connecting rod 13. After the second measuring ball 12 and the measuring ball connecting rod 13 are unscrewed, different lengthened measuring rods can be installed to measure circles (or arcs) with different radiuses.

The circuit board assembly includes a circuit board 7 and a circuit board cover 6.

The circuit board assembly is characterized in that the circuit board 7 is fixedly arranged on the cue stick instrument main body 5 through screws, and the grounding end of the circuit board is communicated with the cue stick instrument main body 5. The power pin of the circuit board is connected with the battery anode guide sheet 9 through a lead. When the battery is conducted, the Bluetooth transmitter on the circuit board can transmit the displacement signal of the measuring rod to the computer.

The cue stick instrument main body 5 is made of metal materials. The inductance measuring head assembly and the battery end cover are connected with the ball rod instrument main body through threads. The circuit board cover plate is connected with the ball arm instrument main body 5 through screws.

2) Center pedestal assembly 200

The central support assembly is characterized in that the measuring ball support block 20 and the magnet 21 are fixedly mounted at the upper end of the movable support rod 22, a circle or a plurality of arc bosses are uniformly distributed on the measuring ball support block 20, three arc bosses are uniformly distributed on the measuring ball support block 20, and the first measuring ball 1 can be reliably contacted with the three arc bosses under the action of the attraction force of the magnet during measurement, so that the ball center position of the measuring ball can not be changed when the measuring ball rotates in all directions.

The lower end of the movable supporting rod 22 is of a structure similar to a sphere and is arranged in the middle of the elastic claw 23. When the cam lever 25 is in the released state, the movable strut 22 can swing freely in the middle of the jaws, or move up and down. When the cam lever 25 is in the locked state, the movable strut 22 is firmly clamped by the jaw and cannot move freely.

The elastic claw 23 has a through hole in the middle for mounting a cam lever 25. The two ends of the cam rod 25 are contacted with an upper cushion block 30, and a spring 26 and an adjusting end cover 27 are sequentially arranged below the upper cushion block 30. The adjustment cap 27 is threadedly coupled to the tapered stop collar 24, and when the adjustment cap 27 is screwed inward, the spring 26 is compressed, and the spring force pushes the upper pad 30 to press the cam rod 25. When the handle 28 is in the vertical position, the cam lever 25 is at the lowest point of the cam travel, and the movable strut 22 is free to move in the middle of the resilient jaws 23. When the lever 28 is pulled horizontally, the cam lever 25 is at the highest point of the cam travel, and the resilient fingers 23 are forced into the tapered surfaces within the tapered stop collar 24, resiliently deforming the fingers and gripping the movable strut 22 to secure the movable strut in position. The elastic claw 23 is fixedly connected with the base 31.

And a base magnet 32 is arranged at the bottom of the base 31 and used for fixing the central support component on a tested platform in an adsorption manner.

3) Center cup assembly 300

The central cup assembly is characterized in that the measuring ball support block 20 and the magnet 21 are fixedly arranged at one end of the central cup support rod 33, the end is used for sucking the second measuring ball 12 during measurement and ensuring that the position of the center of the measuring ball does not change during measurement, and the other end of the central cup support rod 33 is used for clamping on the CNC spindle. While measuring a circle in the XY plane, the center cup assembly 300 and the CNC spindle 500 remain stationary, and the center support assembly 200 follows the CNC XY motion stage in a circular motion around the center cup assembly at a set radius of the club machine mainframe 100. When the YZ and XZ sections are measured, the center support assembly 200 moves along with the XY moving platform, and the center cup assembly 300 moves up and down along with the CNC spindle 500. During measurement, the cue stick instrument records the difference between the motion trajectory and the standard circle (circular arc). And (4) calculating the motion precision of the CNC machine tool through software analysis.

4) Setting ball assembly 400

The ball setting device is characterized in that the setting ball 34 has the same size specification and precision grade with two measuring balls on the ball rod instrument host. The setting ball 34 is fixedly connected with a setting ball handle 35. The setting ball device is used for setting the coordinate origin at the beginning of measurement. The use mode is as follows: firstly, the setting ball is adsorbed on the movable support rod 22 of the central support, and at the moment, the setting ball can freely swing or move up and down along with the movable support rod; the CNC main shaft which controls and clamps the center cup component moves towards the center support component, when the center cup support rod 33 moves to a position about 2mm above the setting ball 34, the movable support rod 22 and the setting ball device of the center support seat can be adsorbed on the center cup support rod 33 under the action of magnetic force, the center position of the setting ball is a measured coordinate origin, and the movable support rod 22 can be fixed by pulling the handle 28 to a locking position (the handle is in a horizontal state), namely the measured coordinate origin is fixed. Then move CNC main shaft certain distance up, will set for ball device and take out, can go down to measure.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the present invention pertains, a number of simple deductions or substitutions can be made without departing from the spirit of the present invention, and all of them should be considered as belonging to the protection scope of the present invention, and the inductance measuring head adopting the present design can also be used for the inductance measuring head for length measurement.