Three-coordinate measuring device capable of automatic calibration

Abstract

The invention discloses a three-coordinate measuring device capable of automatic calibration, which comprises a base, a three-coordinate main body, a measuring head unit, a calibration unit, a control unit and a handle, and is characterized in that the base is used as an installation foundation, the three-coordinate main body is fixedly connected with the base, the measuring head unit is connected with the three-coordinate main body, and the calibration unit is connected with the control unit; the three-coordinate body enables the measuring head unit to move on the X axis, the Y axis and the Z axis, the measuring head unit can measure a workpiece in a multi-direction and multi-angle mode, the calibration unit is connected with the three-coordinate body through bolts, the calibration unit provides a basis for calibration of the three-coordinate measuring device, the handle is electrically connected with the three-coordinate body, and the handle controls the three-coordinate body to move. And the control unit is in signal connection with the three-coordinate main body and the measuring head unit, and the control unit can write a program to control the movement of the three-coordinate main body and the measuring head unit, can exchange data with the three-coordinate main body and the measuring head unit, and receives information obtained through measurement.

Description

Technical Field

[0001] The invention relates to the technical field of three-coordinate measurement, in particular to a three-coordinate measurement device capable of automatic calibration. Background Art

[0002] The three-dimensional coordinate measuring machine is an instrument that can measure geometric shapes, lengths, and circumferential indexing within the space of a hexahedron. The three-dimensional coordinate measuring machine is widely used in industrial fields such as mechanical manufacturing, electronics, automobiles, and aerospace. It can provide high-precision measurement data to help manufacturers ensure the dimensional accuracy and quality of products.

[0003] However, in order to ensure the measurement accuracy of the three-dimensional coordinate measuring machine, regular calibration is essential. The traditional three-dimensional coordinate measuring machine calibration process usually requires manual operation to measure multiple times of measuring blocks, standard balls and other standard parts, which is not only time-consuming but also easily affected by human factors, resulting in the calibration results may not be accurate enough. Summary of the invention

[0004] The object of the present invention is to provide a three-coordinate measuring device that can be automatically calibrated to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The three-coordinate measuring device includes a base, a three-coordinate body, a probe unit, a calibration unit, a control unit and a handle. The three-coordinate body is fixedly connected to the base, the probe unit is connected to the three-coordinate body, the calibration unit is bolted to the three-coordinate body, the handle is electrically connected to the three-coordinate body, and the control unit is signal-connected to the three-coordinate body and the probe unit.

[0007] The base serves as the installation basis, and the three-coordinate body is set on the base. The three-coordinate body can drive the probe unit to move on the X, Y, and Z axes. The probe unit can measure the workpiece in multiple directions and angles. The calibration unit provides a calibration basis for the three-coordinate measuring device. The handle controls the movement of the three-coordinate body to drive the probe unit to reach the workpiece for detection. The control unit can write a program to control the movement of the three-coordinate body and the probe unit, and can exchange data with the three-coordinate body and the probe unit to receive the measured information.

[0008] Furthermore, the three-coordinate body includes a workbench, an electrical control box, a pneumatic body, a Y-axis beam, an auxiliary body, a controller, a grating ruler and a telescopic rod. The electrical control box is fixedly connected to the base, the workbench is fixedly connected to the base, one end of the workbench is adjacent to one end of the electrical control box, an end of the workbench away from the electrical control box is provided with an air-floating guide rail, one end of the pneumatic body and the electrical control box are clearance-matched, the other end of the pneumatic body and one end of the Y-axis beam are fixedly connected, the other end of the Y-axis beam is connected to one end of the auxiliary body, the other end of the auxiliary body and the air-floating guide rail are clearance-matched, the controller and the Y-axis beam are slidably connected, the telescopic rod penetrates into the controller from the lower end of the controller, the telescopic rod and the controller are snap-connected, the grating ruler is fixedly connected to the lower surface of the Y-axis beam, and the grating ruler passes through the controller.

[0009] The air-floating guide surfaces are gas-lubricated with an extremely small friction coefficient, which results in minimal guide wear and long service life. The pneumatic body and auxiliary body ensure the movement of the three-coordinate measuring device on the X-axis, the sliding connection between the Y-axis crossbeam and the controller ensures the movement of the three-coordinate measuring device on the Y-axis, and the telescopic rod and the controller ensure the movement of the three-coordinate measuring device on the Z-axis. The grating ruler is a length measuring element that can record and feedback the displacement data of the three-coordinate measuring device.

[0010] Furthermore, the probe unit includes an automatic measuring seat, an extension rod, a connecting measuring seat and a probe, one end of the automatic measuring seat is rotatably connected to the extension rod, the rotation axis of the automatic measuring seat is perpendicular to the horizontal line, the other end of the automatic measuring seat is threadedly connected to one end of the extension rod, the connecting measuring seat provides an angle for the extension rod, the other end of the extension rod is rotatably connected to one end of the connecting measuring seat, the rotation axis of the connecting measuring seat is perpendicular to the connecting surface between the connecting measuring seat and the extension rod, the other end of the connecting measuring seat is connected to one end of the probe, and the connecting measuring seat provides an angle for the probe.

[0011] The automatic measuring head and the connecting measuring head can be rotated at multiple angles, so that the probe can measure more difficult-to-detect parts, and the extension rod increases the depth of the probe detection.

[0012] Furthermore, the calibration unit includes a base plate, a universal ball seat, a gauge block fixing unit, a gauge block, a limit stud, an adjustment stud, a bearing column, and a standard ball. The base plate is bolted to the base, one end of the universal ball seat is threadedly connected to the base plate, and the other end of the universal ball seat is fixedly connected to the standard ball. A protruding column is provided on the base plate, and two through holes are provided at one end of the protruding column away from the base plate. One through hole at one end of the protruding column is circular, and the circular through hole at one end of the protruding column is provided with an internal thread. The other through hole at one end of the protruding column is a semicircular ring concentric with the central through hole, and the inner wall of the semicircular through hole at one end of the protruding column is provided with a tooth profile. The upper end face of the protruding column is provided with a threaded hole penetrating into the circular through hole on the protruding column. The limit stud and the upper end face of the protruding column The threaded hole is threadedly connected, and a protruding section is provided at the bottom of the gauge block fixing unit, one end of the bearing column is fixedly connected to one side of the protruding section at the bottom of the gauge block fixing unit, the other end of the bearing column penetrates into the circular through hole at one end of the protruding column, the other end of the bearing column is connected to the fixing nut bearing, the fixing nut is threadedly connected to the circular through hole at one end of the protruding column, one end of the adjusting stud is connected to the bearing of one side of the protruding section at the bottom of the gauge block fixing unit, the adjusting stud and the bearing column are on the same side of the gauge block fixing unit, the adjusting stud passes through the protruding column from the semicircular through hole at one end of the protruding column, the part of the adjusting stud in the protruding column is provided with a tooth profile, the tooth profile part on the adjusting stud and the tooth profile in the semicircular through hole on the protruding column fits with each other, and the gauge block is fixed on the gauge block fixing unit.

[0013] By adjusting the adjusting stud, the gauge block fixing unit can be rotated around the axis of the bearing column to provide the angle required for calibration. At the same time, the limit stud is rotated so that the limit stud clamps the bearing column and the gauge block fixing unit is fixed at the angle required for calibration.

[0014] Furthermore, the gauge block fixing unit includes a fixed plate, an L-shaped limit block, a strip limit block, a gate-shaped frame and a limit pin, the L-shaped limit block is fixedly connected to the upper end surface of the fixed plate, the strip limit block is fixedly connected to the upper end surface of the fixed plate, the gate-shaped frame is fixedly connected to the upper end surface of the fixed plate, the upper end surface of the gate-shaped frame is provided with a limit through hole, the limit pin passes through the limit through hole on the upper end surface of the gate-shaped frame, one end of the limit pin is L-shaped, the L-shaped end of the limit pin is located inside the gate-shaped frame, and the positional relationship between the L-shaped limit block, the strip limit block and the limit pin enables the gauge block to be displaced in only one direction.

[0015] The fixing plate, the L-shaped limiting block, the strip limiting block, the door-shaped frame and the limiting pin cooperate with each other to fix the gauge block so that the gauge block does not change when the gauge block fixing unit rotates.

[0016] Furthermore, the workbench is made of granite.

[0017] The granite workbench has a uniform structure and is not easy to deform. It also has the advantages of good rigidity, high hardness, strong wear resistance and small temperature deformation. It is not easy to get dusty, easy to maintain and has a long service life.

[0018] Furthermore, the limiting nail is made of rubber.

[0019] The rubber material ensures that the limit pins will not cause the gauge block to deform when they are used to fix the gauge block, thereby affecting the measurement accuracy and making the calibration of the three-coordinate measuring device inaccurate.

[0020] Furthermore, an angle scale is provided on the portion of the protruding section of the gauge block fixing unit corresponding to the semicircular ring through hole on the protruding cylinder.

[0021] The angle of the fixing plate can be read by the angle scale on the protruding section of the gauge block fixing unit in conjunction with the scale lines at both ends of the semicircular ring through hole on the protruding cylinder.

[0022] Furthermore, a hemispherical pit is provided at one end of the fixing plate, a groove is provided at the other end of the fixing plate, and a hole is provided on the inner surface of the groove at the other end of the fixing plate.

[0023] Hemispherical pits, grooves and holes of fixed sizes are arranged on the fixed plate to help calibrate the three-coordinate measuring device more accurately.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: during calibration, the present invention first selects the corresponding automatic measuring seat, connects the measuring seat and the probe on the control unit, and then adds the angle required by the probe unit according to the gauge block, standard ball, upper hemispherical pit, groove and hole on the bottom plate. After the setting is completed, the probe is controlled by using a handle to take points at the gauge block, standard ball, upper hemispherical pit, groove and hole on the bottom plate respectively, and the collected data is fed back to the control unit for data comparison and adjustment with the standard, thereby performing calibration. The connected measuring seat of the three-coordinate measuring device has rotational energy, so that the probe can detect empty grooves inside some workpieces, making the measurement more accurate and complete. During calibration, each standard part is integrated into a unit, thereby improving the efficiency of calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a front view of the overall structure of the present invention;

[0028] Figure 3 is a schematic diagram of the calibration unit structure of the present invention;

[0029] Figure 4 is a side schematic diagram of a calibration unit of the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the gauge block fixing unit of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the probe unit of the present invention;

[0032] In the figure: 1-base, 2-three-coordinate body, 3-probe unit, 4-calibration unit, 5-control unit, 6-handle, 21-workbench, 22-electrical control box, 23-pneumatic body, 24-Y-axis beam, 25-auxiliary body, 26-controller, 27-grating ruler, 28-telescopic rod, 31-automatic measuring seat, 32-extension rod, 33-connecting measuring seat, 34-probe, 41-bottom plate, 42-universal ball seat, 43-gauge block fixing unit, 44-gauge block, 45-limiting stud, 46-adjusting stud, 47-bearing column, 48-standard ball, 211-air floating guide rail, 411-protruding column, 431-fixing plate, 432-L-shaped limiting block, 433-strip limiting block, 434-door frame, 435-limiting nail, 4112-fixing nut. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention provides a technical solution:

[0035] like Figure 1 As shown, the three-coordinate measuring device includes a base 1, a three-coordinate body 2, a probe unit 3, a calibration unit 4, a control unit 5 and a handle 6. The three-coordinate body 2 is fixedly connected to the base 1, the probe unit 3 is connected to the three-coordinate body 2, the calibration unit 4 is bolted to the three-coordinate body 2, the handle 6 is electrically connected to the three-coordinate body 2, and the control unit 5 is signal-connected to the three-coordinate body 2 and the probe unit 3.

[0036] The base 1 serves as an installation basis, and the three-coordinate main body 2 is arranged on the base 1. The three-coordinate main body 2 can drive the probe unit 3 to move on the three axes of X, Y, and Z. The probe unit 3 can perform multi-directional and multi-angle measurements on the workpiece. The calibration unit 4 provides a calibration basis for the three-coordinate measuring device. The handle 6 controls the movement of the three-coordinate main body 2 and drives the probe unit 3 to reach the workpiece for detection. The control unit 5 can write a program to control the movement of the three-coordinate main body 2 and the probe unit 3, and can exchange data with the three-coordinate main body 2 and the probe unit 3 to receive the measured information.

[0037] like Figure 1 As shown, the three-coordinate main body 2 includes a workbench 21, an electrical control box 22, an air-moving body 23, a Y-axis crossbeam 24, an auxiliary body 25, a controller 26, a grating ruler 27 and a telescopic rod 28. The electrical control box 22 is fixedly connected to the base 1, the workbench 21 is fixedly connected to the base 1, one end of the workbench 21 is adjacent to one end of the electrical control box 22, and the end of the workbench 21 away from the electrical control box 22 is provided with an air-floating guide rail 211, and one end of the air-moving body 23 is spaced from the electrical control box 22. The other end of the pneumatic motor body 23 is fixedly connected to one end of the Y-axis beam 24, the other end of the Y-axis beam 24 is connected to one end of the auxiliary body 25, the other end of the auxiliary body 25 is clearance-matched with the air-floating guide rail 211, the controller 26 is slidably connected to the Y-axis beam 24, the telescopic rod 28 penetrates into the controller 26 from the lower end of the controller 26, the telescopic rod 28 and the controller 26 are snap-connected, the grating ruler 27 is fixedly connected to the lower surface of the Y-axis beam 24, and the grating ruler 27 passes through the controller 26.

[0038] The surfaces of the air-floating guide rail 211 are gas-lubricated, and the friction coefficient is extremely small, so that the guide rail wear is extremely small, the service life is long, the manufacturing accuracy can be maintained for a long time, and the maintenance workload is reduced. The pneumatic body 23 and the auxiliary body 25 ensure the movement of the three-coordinate measuring device on the X axis, the Y-axis crossbeam 24 and the controller 26 are slidably connected to ensure the movement of the three-coordinate measuring device on the Y axis, and the telescopic rod 28 and the controller (26) ensure the movement of the three-coordinate measuring device on the Z axis. The grating ruler 27 is a length measuring element that can record and feedback the displacement data of the three-coordinate measuring device.

[0039] like Figure 5As shown, the probe unit 3 includes an automatic measuring seat 31, an extension rod 32, a connecting measuring seat 33 and a probe 34, one end of the automatic measuring seat 31 is rotatably connected to the telescopic rod 28, the rotation axis of the automatic measuring seat 31 is perpendicular to the horizontal line, the other end of the automatic measuring seat 31 is threadedly connected to one end of the extension rod 32, the connecting measuring seat 33 provides an angle for the extension rod 32, the other end of the extension rod 32 is rotatably connected to one end of the connecting measuring seat 33, the rotation axis of the connecting measuring seat (33) is perpendicular to the connecting surface of the connecting measuring seat 33 and the extension rod 32, the other end of the connecting measuring seat 33 is connected to one end of the probe 34, and the connecting measuring seat 33 provides an angle for the probe 34.

[0040] The automatic measuring base 31 and the connecting measuring base 33 can be rotated at multiple angles, so that the probe 34 can measure more parts that are difficult to detect, and the extension rod 32 increases the detection depth of the probe 34.

[0041] like Figure 2 , Figure 3 As shown, the calibration unit 4 includes a base plate 41, a universal ball seat 42, a gauge block fixing unit 43, a gauge block 44, a limit stud 45, an adjustment stud 46, a bearing column 47, and a standard ball 48. The base plate 41 is bolted to the base 1, one end of the universal ball seat 42 is threadedly connected to the base plate 41, and the other end of the universal ball seat 42 is fixedly connected to the standard ball 48. A protruding column 411 is provided on the base plate 41, and the protruding column 411 is provided away from one end of the base plate 41. There are two through holes, one through hole at one end of the protruding cylinder 411 is circular, the circular through hole at one end of the protruding cylinder 411 is provided with an internal thread, the other through hole at one end of the protruding cylinder 411 is a semicircular ring concentric with the central through hole, the inner wall of the semicircular through hole at one end of the protruding cylinder 411 is provided with a tooth profile, the upper end face of the protruding cylinder 411 is provided with a threaded hole penetrating into the circular through hole on the protruding cylinder 411, the limiting stud 45 and the upper end of the protruding cylinder 411 The threaded hole on the surface is threadedly connected, the bottom of the gauge block fixing unit 43 is provided with a protruding section, one end of the bearing column 47 is fixedly connected to one side of the protruding section at the bottom of the gauge block fixing unit 43, the other end of the bearing column 47 penetrates into the circular through hole at one end of the protruding column 411, the other end of the bearing column 47 is connected to the fixing nut 4112, the fixing nut 4112 is threadedly connected to the circular through hole at one end of the protruding column 411, and one end of the adjusting stud 46 is connected to the gauge block fixing unit 4 The adjusting stud 46 and the bearing column 47 are on the same side of the gauge block fixing unit 43. The adjusting stud 46 passes through the protruding column 411 from the semicircular through hole at one end of the protruding column 411. The portion of the adjusting stud 46 in the protruding column 411 is provided with a tooth profile. The tooth profile portion on the adjusting stud 46 and the tooth profile in the semicircular through hole on the protruding column 411 fit each other. The gauge block 44 is fixed on the gauge block fixing unit 43.

[0042] By adjusting the adjusting screw 46, the gauge block fixing unit 43 can be rotated around the axis of the bearing column 47 to provide the angle required for calibration. At the same time, the limiting screw 45 is rotated so that the limiting screw 45 clamps the bearing column 47 to fix the gauge block fixing unit 43 at the angle required for calibration.

[0043] like Figure 4 As shown, the gauge block fixing unit 43 includes a fixed plate 431, an L-shaped limit block 432, a strip limit block 433, a door-shaped frame 434 and a limit pin 435. The L-shaped limit block 432 is fixedly connected to the upper end surface of the fixed plate 431, the strip limit block 433 is fixedly connected to the upper end surface of the fixed plate 431, the door-shaped frame 434 is fixedly connected to the upper end surface of the fixed plate 431, the upper end surface of the door-shaped frame 434 is provided with a limit through hole, the limit pin 435 passes through the limit through hole on the upper end surface of the door-shaped frame 434, one end of the limit pin 435 is L-shaped, and the L-shaped end of the limit pin 435 is located inside the door-shaped frame 434. The positional relationship between the L-shaped limit block 432, the strip limit block 433 and the limit pin 435 enables the gauge block 44 to be displaced in only one direction.

[0044] The fixing plate 431 , the L-shaped limiting block 432 , the strip limiting block 433 , the door-shaped frame 434 and the limiting pins 435 cooperate with each other to fix the gauge block 44 so that the gauge block 44 does not change when the gauge block fixing unit 43 rotates.

[0045] The workbench 21 material is granite.

[0046] The workbench 21 made of granite has a uniform structure and is not easy to deform. It also has the advantages of good rigidity, high hardness, strong wear resistance and small temperature deformation. It is not easy to get dusty, easy to maintain and has a long service life.

[0047] The limiting pin 435 is made of rubber.

[0048] The rubber material ensures that the limit pin 435 will not cause the gauge block 44 to deform when it cooperates with the fixed gauge block 44, thereby affecting the measurement accuracy and making the calibration of the three-coordinate measuring device inaccurate.

[0049] like Figure 2 As shown, the portion of the protruding section of the gauge block fixing unit 43 corresponding to the semicircular ring through hole on the protruding cylinder 411 is provided with an angle scale.

[0050] The angle of the fixing plate 431 can be read out by the angle scale on the protruding section of the gauge block fixing unit 43 and the scale lines at both ends of the semicircular ring through hole on the protruding cylinder 411.

[0051] A hemispherical pit is provided at one end of the fixing plate 431 , a groove is provided at the other end of the fixing plate 431 , and a hole is provided on the inner surface of the groove at the other end of the fixing plate 431 .

[0052] The fixed plate 431 is provided with hemispherical pits, grooves and holes of fixed sizes, which can help to calibrate the three-coordinate measuring device more accurately.

[0053] The working principle of the present invention is as follows: during calibration, first select the corresponding automatic measuring seat 31, connecting measuring seat 33 and probe 34 on the control unit 5, then add the angle required by the probe unit 3 according to the gauge block 44, standard ball 48, hemispherical pit, groove and hole on the bottom plate 41. After the setting is completed, the probe 34 is controlled by using the handle 6 to take points at the gauge block 44, standard ball 48, hemispherical pit, groove and hole on the bottom plate 41 respectively. The collected data is fed back to the control unit 5 for data comparison and adjustment with the standard, so as to perform calibration. The connecting measuring seat 33 of the three-coordinate measuring device has rotational energy, so that the probe 34 can detect empty grooves inside some workpieces, making the measurement more accurate and complete. During calibration, each standard parts are integrated into a unit, thereby improving the efficiency of calibration.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-coordinate measuring device capable of automatic calibration, characterized in that: The three-coordinate measuring device comprises a base (1), a three-coordinate main body (2), a probe unit (3), a calibration unit (4), a control unit (5) and a handle (6); the three-coordinate main body (2) and the base (1) are fixedly connected, the probe unit (3) and the three-coordinate main body (2) are connected, the calibration unit (4) and the three-coordinate main body (2) are bolted, the handle (6) and the three-coordinate main body (2) are electrically connected, and the control unit (5) and the three-coordinate main body (2) and the probe unit (3) are signal-connected.

2. The three-coordinate measuring device capable of automatic calibration according to claim 1, characterized in that: The three-coordinate main body (2) comprises a workbench (21), an electrical control box (22), a pneumatic body (23), a Y-axis crossbeam (24), an auxiliary body (25), a controller (26), a grating ruler (27) and a telescopic rod (28); the electrical control box (22) and the base (1) are fixedly connected; the workbench (21) and the base (1) are fixedly connected; one end of the workbench (21) is adjacent to one end of the electrical control box (22); one end of the workbench (21) away from the electrical control box (22) is provided with an air-floating guide rail (211); one end of the pneumatic body (23) and the electrical control box (22) are adjacent to one end of the workbench (21); The other end of the pneumatic machine body (23) is fixedly connected to one end of the Y-axis beam (24), the other end of the Y-axis beam (24) is connected to one end of the auxiliary machine body (25), the other end of the auxiliary machine body (25) is clearance-matched to the air-floating guide rail (211), the controller (26) is slidably connected to the Y-axis beam (24), the telescopic rod (28) penetrates into the controller (26) from the lower end of the controller (26), the telescopic rod (28) and the controller (26) are snap-connected, the grating ruler (27) is fixedly connected to the lower surface of the Y-axis beam (24), and the grating ruler (27) passes through the controller (26).

3. The three-coordinate measuring device capable of automatic calibration according to claim 1, characterized in that: The probe unit (3) comprises an automatic measuring seat (31), an extension rod (32), a connecting measuring seat (33) and a probe (34); one end of the automatic measuring seat (31) is rotatably connected to the telescopic rod (28); the rotation axis of the automatic measuring seat (31) is perpendicular to the horizontal line; the other end of the automatic measuring seat (31) is threadedly connected to one end of the extension rod (32); the connecting measuring seat (33) provides an angle for the extension rod (32); the other end of the extension rod (32) is rotatably connected to one end of the connecting measuring seat (33); the rotation axis of the connecting measuring seat (33) is perpendicular to the connecting surface between the connecting measuring seat (33) and the extension rod (32); the other end of the connecting measuring seat (33) is connected to one end of the probe (34); the connecting measuring seat (33) provides an angle for the probe (34).

4. The three-coordinate measuring device capable of automatic calibration according to claim 1, characterized in that: The calibration unit (4) comprises a base plate (41), a universal ball seat (42), a gauge block fixing unit (43), a gauge block (44), a limit stud (45), an adjustment stud (46), a bearing column (47), and a standard ball (48); the base plate (41) and the base (1) are bolted together; one end of the universal ball seat (42) is threadedly connected to the base plate (41); the other end of the universal ball seat (42) is fixedly connected to the standard ball (48); a protruding column (411) is provided on the base plate (41); the protruding column (411) ) is provided with two through holes at one end away from the bottom plate (41), one through hole at one end of the protruding column (411) is circular, the circular through hole at one end of the protruding column (411) is provided with an internal thread, the other through hole at one end of the protruding column (411) is a semicircular ring concentric with the central through hole, the inner wall of the semicircular through hole at one end of the protruding column (411) is provided with a tooth profile, the upper end surface of the protruding column (411) is provided with a threaded hole penetrating into the circular through hole on the protruding column (411), the limiting stud (45) and the protruding column (41 1) is threadedly connected to the threaded hole on the upper end surface, a protruding section is provided at the bottom of the gauge block fixing unit (43), one end of the bearing column (47) is fixedly connected to one side of the protruding section at the bottom of the gauge block fixing unit (43), the other end of the bearing column (47) is inserted into the circular through hole at one end of the protruding column (411), the other end of the bearing column (47) is bearing-connected to the fixing nut (4112), the fixing nut (4112) is threadedly connected to the circular through hole at one end of the protruding column (411), one end of the adjusting stud (46) is connected to the gauge block fixing unit (4 3) one side of the bottom protruding section is connected to a bearing, the adjusting stud (46) and the bearing column (47) are on the same side of the gauge block fixing unit (43), the adjusting stud (46) passes through the protruding column (411) from a semicircular through hole at one end of the protruding column (411), the portion of the adjusting stud (46) inside the protruding column (411) is provided with a tooth profile, the tooth profile portion on the adjusting stud (46) and the tooth profile in the semicircular through hole on the protruding column (411) fit each other, and the gauge block (44) is fixed on the gauge block fixing unit (43).

5. The three-coordinate measuring device capable of automatic calibration according to claim 4, characterized in that: The gauge block fixing unit (43) comprises a fixing plate (431), an L-shaped limiting block (432), a strip limiting block (433), a door-shaped frame (434) and a limiting pin (435); the L-shaped limiting block (432) is fixedly connected to the upper end surface of the fixing plate (431); the strip limiting block (433) is fixedly connected to the upper end surface of the fixing plate (431); the door-shaped frame (434) is fixedly connected to the upper end surface of the fixing plate (431); A limiting through hole is arranged on the upper end surface of the door-shaped frame (434), and the limiting pin (435) passes through the limiting through hole on the upper end surface of the door-shaped frame (434). One end of the limiting pin (435) is L-shaped, and the L-shaped end of the limiting pin (435) is located inside the door-shaped frame (434). The positional relationship between the L-shaped limiting block (432), the strip limiting block (433) and the limiting pin (435) enables the gauge block (44) to move in only one direction.

6. The three-coordinate measuring device capable of automatic calibration according to claim 2, characterized in that: The workbench (21) is made of granite.

7. The three-coordinate measuring device capable of automatic calibration according to claim 5, characterized in that: The limiting nail (435) is made of rubber.

8. The three-coordinate measuring device capable of automatic calibration according to claim 4, characterized in that: An angle scale is provided on a portion of the protruding section of the gauge block fixing unit (43) corresponding to the semicircular through hole on the protruding cylinder (411).

9. The three-coordinate measuring device capable of automatic calibration according to claim 5, characterized in that: A hemispherical pit is provided at one end of the fixing plate (431), a groove is provided at the other end of the fixing plate (431), and a hole is provided on the inner surface of the groove at the other end of the fixing plate (431).

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