Diameter measuring device and method

Abstract

The invention relates to a diameter measuring device and method, and belongs to the technical field of diameter measurement. Comprising a double-involute displacement driving device and a measuring head device. The double-involute circular truncated cone is located in the long hole cover, the double-involute circular truncated cone penetrates through the cover disc to extend out, and the double-involute circular truncated cone is rotated to enable the connecting rod restrained by the rectangular groove of the long hole cover and the involute groove of the double-involute circular truncated cone to move so as to change the diameter measurement range of the device. The flexible hinge is composed of an external rectangular support and a hinge structure, the displacement sensor check block is connected to the external rectangular support of the flexible hinge, the displacement sensor is connected to the hinge structure of the flexible hinge and makes contact with the displacement sensor check block, and the measuring head is connected to the hinge structure of the flexible hinge. The double-involute displacement driving device is used for enabling the measuring head device to slide along the two centrosymmetric involutes so as to change the distance between the upper measuring head and the lower measuring head, and the measuring device has the advantages of being high in measuring precision and good in stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of diameter measurement, and more specifically, relates to a diameter measuring device and method, and in particular to a device and method for measuring the inner diameter and outer diameter of similar parts such as shafts, holes, and bearings. Background Art

[0002] Hole and shaft structures are widely used in various fields. The diameter of hole and shaft parts is a crucial part of the part size. For example, the diameter of the hole and shaft is very important for the axial positioning of the parts. It can ensure the correct position of the parts during the assembly process and improve the accuracy and efficiency of the assembly. It has an important impact on the installation and sealing effect of the seal. The correct hole and shaft diameter can ensure the effective sealing of the seal. If the hole and shaft are too tight or too loose, it may cause increased wear and affect the service life of the parts. Therefore, controlling the diameter size of the hole and shaft is very important to reduce wear and extend the life of the parts. In summary, the diameter size of the hole and shaft is of great significance to the assembly, function, performance and life of the parts. It is a parameter that needs special attention and precise control in mechanical design and manufacturing. The hole and shaft diameter measurement mainly includes caliper measurement or the use of special measuring instruments, such as horizontal measuring instruments, vertical measuring instruments, etc.

[0003] A displacement sensor is a device or equipment used to measure the position, displacement or change in position of an object. They can be implemented through a variety of different principles, including mechanical, optical, electrical and magnetic principles. The main types of displacement sensors are resistive sensors, optical sensors, capacitive sensors, magnetic sensors, piezoresistive sensors, etc. Displacement sensors are widely used in various fields, including industrial automation, mechanical manufacturing, automotive industry, aerospace, etc.

[0004] The existing hole shaft diameter measurement technology has the technical problems of low measurement accuracy, poor stability, and inconvenience in carrying. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a diameter measuring device and method, which can achieve precise measurement of hole and shaft diameters within a certain range through research and design of the specific structures of key components such as double involute cones, displacement sensors and flexible hinges and their mutual coordination relationships. It has the advantages of high measurement accuracy and good stability, and the measuring device is portable and easy to operate, and can perform high-precision measurement of the diameter of any hole or shaft.

[0006] According to a first aspect of the present invention, there is provided a diameter measuring device, comprising a double involute displacement drive device and two probe devices;

[0007] The double involute displacement drive device comprises a double involute truncated table, a long hole cover and a cover plate; the probe device comprises a flexible hinge, a probe, a displacement sensor and a displacement sensor block; the double involute displacement drive device and the two probe devices are respectively connected by connecting rods, and the connecting rods are connected to the connecting table by a flat key shaft hole; the connecting rods are fixed to the long hole cover by a tightening component;

[0008] The oblong hole cover is connected to the cover plate, the double involute cone passes through the cover plate and is located in the oblong hole cover; a rectangular groove is provided on the back of the oblong hole cover; the double involute cone is engraved with a centrally symmetrical involute groove; the connecting rod is engaged with the rectangular groove and the involute groove of the double involute cone; the centrally symmetrical involute groove of the double involute cone is used to make the connecting rods of the two probe devices move relative to each other, thereby changing the distance between the probes of the two probe devices;

[0009] The flexible hinge comprises an external rectangular bracket and a hinge mechanism; the displacement sensor block is connected to the external rectangular bracket of the flexible hinge; the displacement sensor is connected to the hinge mechanism of the flexible hinge and contacts the displacement sensor block; the probe is connected to the hinge mechanism of the flexible hinge; the hinge mechanism is connected to the connecting platform through a flexible hinge gasket;

[0010] The probe device also includes a flexible hinge clamping device, which includes a double-headed screw and a clamping knob; the double-headed screw has screws at both ends, and a circular ring structure extends in the middle to contact the flexible hinge, one end of the double-headed screw is connected to the threaded hole of the connecting platform, and the other end is fixed by the clamping knob. Preferably, the connecting rod is fixed to the long hole cover by an annular gasket and a tightening device.

[0011] Preferably, the edge of the double involute cone is engraved with scales marking the rotation angle; and a window is provided at the edge of the long hole cover for reading the rotation angle of the double involute cone.

[0012] Preferably, the double involute displacement drive device further comprises a wrench, one end of which is connected to the boss structure at the bottom of the double involute cone, so as to be used to rotate the double involute cone.

[0013] Preferably, the flexible hinge is rectangular, including an X-direction flexible hinge and a first Y-direction flexible hinge, a second Y-direction flexible hinge and a third Y-direction flexible hinge, one end of the X-direction flexible hinge is connected to the third Y-direction flexible hinge, and the other end of the X-direction flexible hinge is simultaneously connected to the first Y-direction flexible hinge and the second Y-direction flexible hinge; the other ends of the first Y-direction flexible hinge, the second Y-direction flexible hinge and the third Y-direction flexible hinge are connected to the rectangular bracket.

[0014] According to another aspect of the present invention, a method for measuring the diameter of a hole-type part using the diameter measuring device is provided, wherein the displacement sensor and the probe are fixed by a flexible hinge clamping device, the double involute truncated table is rotated to drive the probe device to move up and down until the gauge block is clamped on the inner side of the probe, and then the connecting rod is fixed by a tightening component; the two probes are axially touched to the upper and lower outer surfaces of the hole to be measured, and the diameter of a point at the measuring edge is sequentially scanned and measured to obtain multiple measurement data, and the data when the displacement sensor moves at the minimum value is used to calculate the diameter of the hole-type part by the following formula; the diameter R of the hole-type part 孔 Calculation formula:

[0015] R 孔 =L-2δ+2ε

[0016] in L is the distance between the two probes of the probe device measured by the gauge block calibration; δ is the displacement of the displacement sensor when it moves to the minimum value; ε is the diameter of the probe ball head.

[0017] According to another aspect of the present invention, a method for measuring the diameter of shaft parts using the diameter measuring device is provided, characterized in that the displacement sensor and the probe are fixed by a flexible hinge clamping device, the double involute truncated table is rotated to drive the probe device to move up and down until the inner side of the probe ball head is stuck with the gauge block, and then the connecting rod is fixed by a tightening component; the two probes are axially touched to the upper and lower outer surfaces of the shaft to be measured, multiple points are taken for multiple measurements, and the data at the maximum displacement of the displacement sensor is used to calculate the diameter of the shaft part by the following formula; the diameter R of the shaft part 轴 Calculation formula:

[0018] R 轴 =L+2δ

[0019] in L is the distance between the two probes of the probe device measured by the gauge block calibration; δ The displacement of the displacement sensor when it moves to its maximum value.

[0020] In general, compared with the prior art, the diameter measuring device provided by the present invention has the following beneficial effects:

[0021] (1) The present invention uses an involute groove to drive a probe device, and uses the rotation angle of a double involute cone to calculate the distance between two probe devices, which can roughly estimate the measuring range of the measuring device, and has the advantages of quick operation and simple steps.

[0022] (2) The probe device of the present invention is arranged symmetrically, and the installation position of the probe is biased towards one side of the flexible hinge. By changing the installation direction of the flexible hinge on the probe device, the distance between the two probes can be changed, thereby changing the measuring range of the device so that the device has a larger measuring range.

[0023] (3) The probe device of the present invention adopts a flexible hinge, which has high movement accuracy, no mechanical friction, no gap, high movement sensitivity, and ensures the translation of the probe, thereby achieving higher measurement accuracy.

[0024] (4) The diameter measuring device of the present invention can be applied to holes or shafts of different sizes. By rotating the double involute truncated cone, the distance between the two probe devices can be changed to obtain different measuring ranges. Therefore, the diameter measuring device has strong applicability and is conducive to popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a straight outer diameter measuring device provided by the present invention.

[0026] Figure 2 yes Figure 1 A schematic diagram of a straight outer diameter measuring device along a front view.

[0027] Figure 3 yes Figure 1 A schematic diagram of a diameter measuring device in a top view.

[0028] Figure 4 yes Figure 1 A schematic diagram of a diameter measuring device along the left side view.

[0029] Figure 5 yes Figure 1 A schematic diagram of a diameter measuring device after changing the installation direction of the flexible hinge.

[0030] Figure 6 yes Figure 1 A schematic structural diagram of a double involute cone of a diameter measuring device.

[0031] Figure 7 yes Figure 1 Schematic diagram of the XY direction displacement deformation of a flexible hinge of a diameter measuring device.

[0032] Figure 8 yes Figure 1 A schematic diagram of a probe overall device, a connecting rod and a connecting rod clamping device in a diameter measuring device.

[0033] Fig. 9 A partial cross-sectional view of the probe device.

[0034] In all the drawings, the same figure numbers are used to represent the same elements or structures, among which: 1-long hole cover, 2-cover plate, 3-double involute cone, 4-connecting rod, 5-annular gasket, 6-fastening device, 7-connecting table, 8-flat key, 9-flexible hinge gasket, 10-flexible hinge, 10.0-rectangular bracket, 10.1-X-axis flexible hinge, 10.2-first Y-axis flexible hinge, 10.3-second Y-axis flexible hinge, 10.4-third Y-axis flexible hinge, 11-displacement sensor, 12-displacement sensor stopper, 13-probe, 14-double-headed screw, 15-clamping knob. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] On a plane, when a moving straight line (generator line) rolls along a fixed circle (base circle), the trajectory of any point on this straight line is called an involute of this base circle. The length of the involute generator line remains unchanged before and after it is straightened, that is, the length of the generator line rolling along the base circle is equal to the length of the arc rolled on the base circle. Based on this property, the distance of a point on the involute relative to the center of the base circle can be calculated through the angular displacement of the point and the diameter of the base circle.

[0037] The present invention provides a diameter measuring device, comprising a double involute displacement driving device and two probe devices, wherein the double involute displacement driving device is used to make the probe device slide along two centrally symmetrical involutes to change the distance between the two probes; the double involute displacement driving device comprises a double involute cone, a long hole cover and a cover plate; a connecting rod connects the probe device and has a spiral line thereon for installing a tightening component; the long hole cover matches the cover plate, the double involute cone is located in the long hole cover, the double involute cone part extends through the cover plate, and a rectangular groove is provided on the back of the long hole cover, which cooperates with the connecting rod to ensure that the connecting rod maintains translational motion during movement without angular displacement; the double involute cone is engraved with centrally symmetrical involutes, and by rotating the double involute cone, the connecting rod constrained by the rectangular groove of the long hole cover and the involute groove of the double involute cone is moved, thereby changing the diameter measuring range of the device.

[0038] The probe device described in the present invention includes a flexible hinge, a probe, a displacement sensor mechanism, and a displacement sensor block structure; the flexible hinge is composed of an external rectangular bracket and a hinge structure; the displacement sensor block is connected to the external rectangular bracket of the flexible hinge; the displacement sensor is connected to the hinge mechanism of the flexible hinge and is in contact with the displacement sensor block; the probe is connected to the hinge mechanism of the flexible hinge; the flexible hinge mechanism is connected to the connecting platform; the connecting platform is connected to the connecting rod. The measuring device also includes a flexible hinge gasket, which connects the connecting platform to the flexible hinge. The measuring device also includes a flat key, and the connecting platform is connected to the connecting rod through the flat key. The flat key ensures that the connecting platform will not undergo angular displacement relative to the connecting rod. The displacement sensor is fixed on the rectangular bracket, driven by the unidirectional movement of the probe X-axis, and records the X-direction displacement data. The double involute displacement drive device should also include a tightening component, which includes a tightening device and an annular gasket; the clamping device is connected to the connecting rod, and the connecting rod can be fixed by screwing so that it can be fixed to the long hole cover after the position of the probe device is adjusted. The probe device also includes a flexible hinge clamping device, which includes a double-headed screw and a clamping knob; the double-headed screw has screws at both ends, and a circular ring structure extends in the middle to contact the flexible hinge, and the double-headed screw is connected to the threaded hole of the connecting platform on one side and connected to the clamping knob on the other side. When the flexible hinge clamping device is working, the double-headed screw is first rotated so that the upper surface of its circular ring structure is in close contact with the lower surface of the flexible hinge, and then the clamping knob is rotated to contact the upper surface of the flexible hinge to jam the flexible hinge.

[0039] After the flexible hinge clamping device clamps the flexible hinge, a gauge block of suitable size is used to limit the distance between the two probes, and the probe device is driven to move by rotating the involute truncated table so that the inner sides of the two probes contact the gauge block, and then the connecting rod clamping device is used to fix them. The distance between the probes can be obtained to facilitate subsequent diameter measurement.

[0040] In some embodiments, the edge of the double involute table is engraved with scales indicating the rotation angle; a window is provided at the edge of the long hole cover for reading the rotation angle of the double involute table, thereby obtaining the approximate distance between the two probe devices to facilitate rapid adjustment of the measuring range of the device.

[0041] In some embodiments, the double involute displacement drive device should also include a wrench or a rotating handle device, one end of the wrench is connected to the hexagonal boss structure at the bottom of the double involute cone for rotating the double involute cone, thereby driving the probe device to move and change the measuring range.

[0042] In some embodiments, the hinge structure is basically rectangular, including an X-axis flexible hinge and a first Y-axis flexible hinge, a second Y-axis flexible hinge and a third Y-axis flexible hinge, one end of the X-axis flexible hinge is connected to the third Y-axis flexible hinge, and the other end of the X-axis flexible hinge is simultaneously connected to the first Y-axis flexible hinge and the second Y-axis flexible hinge; one end of the first Y-axis flexible hinge is connected to the rectangular bracket; the other end of the second Y-axis flexible hinge is connected to the rectangular bracket; the other end of the third Y-axis flexible hinge is connected to the rectangular bracket.

[0043] In some embodiments, the displacement sensor baffle is fixed on the first Y-direction flexible hinge and contacts the displacement sensor, ensuring that lateral impact cannot be transmitted to the displacement sensor, thereby protecting the displacement sensor.

[0044] In some embodiments, the measuring head is fixed on the first X-direction flexible hinge. Due to the effect of the flexible hinge, the measuring head generates X-direction translation during the measurement process, which is transmitted to the displacement sensor through the hinge structure.

[0045] In some embodiments, the probe device is symmetrically arranged, the installation position of the probe is close to one side of the flexible hinge, and the measuring range of the device can be changed by changing the installation direction of the flexible hinge on the probe device. When the probes are simultaneously biased toward the inner side of the connecting platform, the measuring range of the device is smaller, and when the probes are simultaneously biased toward the outer side of the connecting platform, the measuring range of the device is larger.

[0046] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The present invention provides a diameter measuring device, including a double involute displacement driving device and two probe devices; including a long hole cover 1, a cover plate 2, a double involute frustum 3, a connecting rod 4, an annular gasket 5, a tightening device 6, a connecting platform 7, a flat key 8, a flexible hinge gasket 9, a flexible hinge 10, a displacement sensor 11, a displacement sensor block 12, a probe 13, a double-headed screw 14, and a clamping knob 15.

[0047] The displacement sensor 11, the displacement sensor block 12, and the probe 13 are respectively arranged on the flexible hinge 10 in sequence, and the flexible hinge 10, the flexible hinge gasket 9 and the connecting platform 7 are connected in sequence. The connecting platform 7 is connected to the connecting rod 4 through the flat key 8. The long hole cover 1 is matched with the cover plate 2, and the double involute cone 3 is located in the long hole cover 1. The double involute cone 3 extends through the cover plate 2. The back of the long hole cover 1 has a rectangular groove, and the connecting rod 4 cooperates with the rectangular groove on the back of the long hole cover 1 and the involute groove of the upper involute cone 3. The tightening device 6 is connected to the annular gasket 5 and the connecting rod 4. The wrench is connected to the hexagonal boss structure at the bottom of the double involute cone 3. When working, the wrench rotates the double involute cone 3 to drive the two connecting rods 4 to generate displacement and drive the probe device to change the measurement range. The tightening device 6 is tightened to make the annular gasket 5 fit closely with the connecting rod 4 so that the connecting rod 4 is fixed and locked with the long hole cover 1. When the probe 13 contacts the hole / shaft part, it generates an X-direction displacement, which causes the flexible hinge 10 to generate an X-direction displacement. The flexible hinge 10 converts the displacement into a local position change of the displacement sensor block 12 in proportion, so that the displacement sensor 11 obtains the position coordinates of the hole / shaft diameter in the probe coordinate system and then calculates the measured hole / shaft diameter.

[0048] See also Figure 5 The probe device is arranged symmetrically, and the installation position of the probe 13 is close to one side of the flexible hinge 10. The measuring range of the device can be changed by changing the installation direction of the flexible hinge 10 on the probe device. When the two probes 13 are simultaneously biased toward the inner side of the connecting platform 7, the measuring range of the device is small. When the two probes 13 are simultaneously biased toward the outer side of the connecting platform 7, the measuring range of the device is large. According to the design of the size of the probe device, it can be known that the distance between the arrangement position of the probe 13 and the central axis of the connecting platform is ΔΦ .

[0049] See also Figure 6 , the double involute cone 3 is composed of a circular table and a circular boss on the back. The circular table is engraved with an involute groove, and the involute on the cone extends from a base circle with a diameter of R, and the two involutes are centrally symmetrical relative to the center of the circle. The edge of the circular table of the double involute cone 3 is engraved with an angle scale ranging from 0 to 280° (due to the nature of the involute, the rotation angle range is within 280°). The rotation angle of the double involute cone 3 is read through the window of the long hole cover 1, and then the approximate distance between the two probe devices is obtained to facilitate the rapid adjustment of the measuring range of the device. When the connecting rod 4 moves along the involute groove, it can be calculated from the rotation angle of the double involute cone 3. The angle of the connecting rod 4 at the intersection of the involute and the base circle is 0. The distance formula between the connecting rod 4 and the center of the base circle is:

[0050]

[0051] Where Φ is the distance from the connecting rod 4 to the center of the base circle, and θ (rad) is the rotation angle of the double involute cone 3. It can be seen that the distance between the midpoints of the connecting rod 4 moving along the two involutes is 2Φ. Then the distance between the two probes 13 is:

[0052] Φ1=Φ±2ΔΦ

[0053] When the two probes 13 are simultaneously biased toward the outside of the connecting platform 7, it is a plus sign, and when the two probes 13 are simultaneously biased toward the inside of the connecting platform 7, it is a minus sign. The distance between the probes 13 can be roughly determined by the above formula. The circular boss on the back of the double involute truncated cone 3 extends through the circular hole in the center of the cover plate 2, and a hexagonal bolt structure is extended outside to be connected with the wrench.

[0054] See also Figure 7 The flexible hinge 10 is composed of an external rectangular bracket 10.0 and a hinge structure. The hinge structure is basically rectangular, and includes an X-direction flexible hinge 10.1 and a first Y-direction flexible hinge 10.2, a second Y-direction flexible hinge 10.3 and a third Y-direction flexible hinge 10.4. One end of the X-direction flexible hinge 10.1 is connected to the third Y-direction flexible hinge 10.4, and the other end of the X-direction flexible hinge 10.1 is simultaneously connected to the first Y-direction flexible hinge 10.2 and the second Y-direction flexible hinge 10.3; one end of the first Y-direction flexible hinge 10.2 is connected to the rectangular bracket 10.0; the other end of the second Y-direction flexible hinge 10.3 is connected to the rectangular bracket 10.0; and the other end of the third Y-direction flexible hinge 10.4 is connected to the rectangular bracket 10.0. The displacement sensor 11 is connected to the rectangular bracket 10.0 of the flexible hinge 10, and the displacement sensor stopper 12 is connected to the first Y-direction flexible hinge 10.2 and fits the displacement sensor 11. The probe 13 is connected to the X-direction flexible hinge 10.1. The probe 13 is driven to move unidirectionally along the X-axis by the Y-direction hinge structure and the X-direction hinge structure.

[0055] The flexible hinge gasket 9 is a frame-shaped structure, which is used to connect the connection platform 7 and the flexible hinge 10. The flexible hinge gasket 9 makes the load distribution stable. The flexible hinge gasket 9, the connection platform 7 and the flexible hinge 10 are connected together by long bolts. The flexible hinge gasket 9 provides enough height for the double-headed screw 14 so that its annular structure can fit on the lower surface of the flexible hinge 10.

[0056] The displacement sensor baffle 12 is fixed on the first Y-direction flexible hinge 10.2 and contacts the displacement sensor 11. During the measurement process, the probe 13 generates X-direction translation, which is transmitted to the displacement sensor 11 through the hinge structure. During the above process, the displacement sensor baffle 12 protects the displacement sensor 11 from damage caused by lateral impact.

[0057] The displacement sensor 11 is fixed on the rectangular bracket 10.0, and is driven by the unidirectional movement of the probe 13 along the X-axis direction to record the X-axis displacement data. A specific displacement sensor is selected, such as the DZR / 2 / S displacement sensor of Solartron Metrology, whose measurement range is 2.25 mm. Before starting the measurement, it is necessary to limit the distance between the displacement sensor 11 and the displacement sensor block 12 so that the reading of the displacement sensor 11 is half of its measurement range, that is, at this time, the measurement range of the displacement sensor 11 is ±1.125mm .

[0058] See also Figure 8 The flexible hinge 10 is composed of an external rectangular bracket and a hinge mechanism; the displacement sensor block 12 is connected to the external rectangular bracket of the flexible hinge 10; the displacement sensor 11 is connected to the hinge mechanism of the flexible hinge 10 and is in contact with the displacement sensor block 12; the probe 13 is connected to the hinge mechanism of the flexible hinge 10; the flexible hinge mechanism is connected to the connecting platform 7 through a flexible hinge gasket 9; the connecting platform 7 is connected to the connecting rod 4, and the flexible hinge gasket 9 is connected to the connecting platform 7 and the flexible hinge 10.

[0059] The tightening device 6 is basically cylindrical, and the radius at the lower part is increased to increase the contact area with the annular gasket 5. The interior of the tightening device 6 is a threaded hole, through which the connecting rod 4 is threadedly engaged. The connecting rod 4 can be fixed by threading so that it can be fixed to the long hole cover 1 after the position of the probe device is adjusted. The annular gasket 5 is an annular thin sheet, which is used to connect the tightening device 6 and the long hole cover 1. The annular gasket 5 uses a relatively flexible material so that after the tightening device 6 is tightened, the rectangular upper surface of the connecting rod 4 is tightly fitted with the rectangular groove on the back of the long hole cover 1 to ensure the overall verticality of the probe device.

[0060] The two ends of the double-headed screw 14 are screws, and a circular ring structure is extended in the middle to contact the flexible hinge 10. The double-headed screw is connected to the threaded hole of the connecting platform on one side and connected to the clamping knob 15 on the other side; the clamping knob 15 is basically cylindrical, and the radius is increased at the lower part to increase the contact area with the flexible hinge 10. When the flexible hinge clamping device is working, the double-headed screw is first rotated so that the upper surface of its circular ring structure is in close contact with the lower surface of the flexible hinge, and then the clamping knob is rotated to contact the upper surface of the flexible hinge to clamp the flexible hinge.

[0061] See also Fig. 9 , the flat key 8 connects the connecting rod 4 and the connecting platform 7. The flat key 8 ensures that the connecting platform 7 is circumferentially fixed relative to the connecting rod 4. The connecting platform 7 and the connecting rod 4 are also connected by screws, and the screws pass through the center hole of the connecting platform 7 and the threaded hole above the connecting rod 4 to ensure that the connecting platform 7 is axially fixed relative to the connecting rod 4.

[0062] One end of the wrench is connected to a hexagonal bolt structure extending from the bottom of the double involute truncated cone 3. When the distance between the two probes 13 needs to be changed, the wrench is used to rotate the double involute truncated cone 3 to drive the probe device to move and change the measuring range.

[0063] After the flexible hinge clamping device clamps the flexible hinge, a gauge block of suitable size is used to limit the distance between the two probes 13, and the probe device is driven to move by rotating the involute truncated table 3 so that the inner sides of the two probes 13 contact the gauge block, and then the connecting rod clamping device is used to fix them. The distance between the probes 13 can be obtained to facilitate subsequent diameter measurement.

[0064] The present invention firstly uses a gauge block to accurately determine the distance between the inner sides of the ruby ​​ball head of the probe, and then uses the ruby ​​ball head of the probe to contact the measured hole / shaft, and can effectively obtain the position coordinates of the hole / shaft diameter in the probe coordinate system from the set displacement sensor 11, and then can calculate the diameter of the measured hole / shaft. When the device is used to measure the diameter of shaft parts, the probe 13 touches the outer surface of the shaft along the axial direction, and measures back and forth multiple times to take the data when the displacement sensor has the minimum displacement as the diameter of the shaft; when the device is used to measure the diameter of hole parts, the probe 13 touches the inner surface of the hole along the axial direction, and takes multiple point measurements to take the data when the displacement sensor has the maximum displacement as the diameter of the hole.

[0065] The specific measurement process of this embodiment is as follows: when measuring hole parts, fix the displacement sensor and the probe through the flexible hinge clamping device, use a wrench to rotate the double involute frustum to drive the probe device up and down until the inner side of the ruby ​​ball head of the probe is stuck with the gauge block, and then use the tightening device to fix the connecting rod. Use this device to touch the upper and lower probes axially to the upper and lower outer surfaces of the hole, take multiple points and measure multiple times, and take the result calculated when the displacement sensor moves the minimum value. Diameter calculation formula for hole parts:

[0066] R 孔 =L-2δ+2ε

[0067] in L is the distance of the probe ruby ​​ball head measured by the gauge block; δ is the displacement of the displacement sensor, assuming that the displacement outside the circle is positive and the displacement inside the circle is negative; ε is the diameter of the ruby ​​ball head of the probe.

[0068] When measuring shaft parts, fix the displacement sensor and the probe through the flexible hinge clamping device, use a wrench to rotate the double involute frustum to drive the probe device up and down until the inside of the probe ruby ​​ball head is stuck to the gauge block, and then use the tightening device to fix the connecting rod. Use this device to touch the upper and lower probes to the upper and lower outer surfaces of the shaft along the axial direction, take multiple points and measure multiple times, and take the result calculated when the displacement sensor moves the maximum value. Diameter calculation formula for shaft parts:

[0069] R 轴 =L+2δ

[0070] Set the zero point of the displacement sensor coordinate system to the position after it is fixed using the flexible hinge clamping device each time.

[0071] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A diameter measuring device, characterized in that: It includes a double involute displacement drive device and two probe devices; The double involute displacement drive device comprises a double involute truncated cone (3), a long hole cover (1) and a cover plate (2); the probe device comprises a flexible hinge (10), a probe (13), a displacement sensor (11) and a displacement sensor stopper (12); the double involute displacement drive device and the two probe devices are respectively connected via a connecting rod (4); the connecting rod (4) and the connecting table (7) are matched and connected via a flat key (8) axial hole; the connecting rod (4) is fixed to the long hole cover (1) via a tightening component; The long hole cover (1) is connected to the cover plate (2); the double involute cone (3) passes through the cover plate (2) and is located in the long hole cover (1); a rectangular groove is provided on the back of the long hole cover (1); the double involute cone (3) is engraved with a centrally symmetrical involute groove; the connecting rod (4) is engaged with the rectangular groove and the involute groove of the double involute cone (3); the centrally symmetrical involute groove of the double involute cone (3) is used to enable the connecting rods (4) of two probe devices to move relative to each other, thereby changing the distance between the probes (13) of the two probe devices; The flexible hinge (10) comprises an external rectangular bracket and a hinge mechanism; the displacement sensor block (12) is connected to the external rectangular bracket of the flexible hinge (10); the displacement sensor (11) is connected to the hinge mechanism of the flexible hinge (10) and is in contact with the displacement sensor block (12); the probe (13) is connected to the hinge mechanism of the flexible hinge (10); the hinge mechanism is connected to the connecting platform (7) via a flexible hinge gasket (9); The probe device also includes a flexible hinge clamping device, which includes a double-headed screw (14) and a clamping knob (15); the double-headed screw (14) has screws at both ends, and a circular ring structure extends in the middle to contact the flexible hinge (10); one end of the double-headed screw (14) is connected to the threaded hole of the connecting platform (7), and the other end is fixed by the clamping knob (15).

2. The diameter measuring device according to claim 1, characterized in that: The connecting rod (4) is fixed to the long hole cover (1) via an annular gasket (5) and a tightening device (6).

3. The diameter measuring device according to claim 1, characterized in that: The edge of the double involute cone (3) is engraved with scales marking the rotation angle; and a window is provided at the edge of the long hole cover (1) for reading the rotation angle of the double involute cone.

4. The diameter measuring device according to claim 1, characterized in that: The double involute displacement drive device also comprises a wrench, one end of which is connected to a boss structure at the bottom of the double involute truncated cone (3), so as to be used for rotating the double involute truncated cone (3).

5. The diameter measuring device according to claim 1, characterized in that: The flexible hinge (10) is rectangular, and includes an X-direction flexible hinge and a first Y-direction flexible hinge, a second Y-direction flexible hinge and a third Y-direction flexible hinge; one end of the X-direction flexible hinge is connected to the third Y-direction flexible hinge, and the other end of the X-direction flexible hinge is simultaneously connected to the first Y-direction flexible hinge and the second Y-direction flexible hinge; the other ends of the first Y-direction flexible hinge, the second Y-direction flexible hinge and the third Y-direction flexible hinge are connected to the rectangular bracket.

6. A method for measuring the diameter of a hole-like part using the diameter measuring device according to any one of claims 1 to 5, characterized in that: Fix the displacement sensor and the probe through a flexible hinge clamping device, rotate the double involute truncated table to drive the probe device to move up and down until the inner side of the probe is stuck with the gauge block, and then use the tightening component to fix the connecting rod; touch the upper and lower outer surfaces of the hole to be measured along the axial direction of the two probes, and scan and measure the diameter of a point on the edge of the measurement in sequence to obtain multiple measurement data. Use the data when the displacement sensor moves at the minimum value to calculate the diameter of the hole part through the following formula; the diameter of the hole part R 孔 Calculation formula: R 孔 =L-2δ+2ε in L is the distance between the two probes of the probe device measured by the gauge block calibration; δ The displacement of the displacement sensor when it moves to the minimum value; ε is the diameter of the probe ball head.

7. A method for measuring the diameter of shaft parts using the diameter measuring device as claimed in any one of claims 1 to 5, characterized in that: Fix the displacement sensor and the probe through the flexible hinge clamping device, rotate the double involute truncated table to drive the probe device to move up and down until the inner side of the probe ball head is stuck with the gauge block, and then use the tightening parts to fix the connecting rod; touch the upper and lower outer surfaces of the shaft to be measured along the axial direction of the two probes, take multiple points and measure multiple times, and use the data when the displacement sensor moves at the maximum value to calculate the diameter of the shaft parts through the following formula; the diameter R of the shaft parts 轴 Calculation formula: R 轴 =L+2δ in L is the distance between the two probes of the probe device measured by the gauge block calibration; δ The displacement of the displacement sensor when it moves to its maximum value.

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