Diameter measuring device and method

Abstract

The present invention relates to a diameter measuring device and method, belonging to the technical field of diameter measurement. The device comprises a double involute displacement drive device and a probe device; the double involute cone is located in a long hole cover, and the double involute cone extends through the cover plate. Rotating the double involute cone moves a connecting rod constrained by the rectangular groove of the long hole cover and the involute groove of the double involute cone, thereby changing the diameter measurement range of the device; 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 contacts the displacement sensor block; the probe is connected to the hinge mechanism of the flexible hinge; the double involute displacement drive device is used to make the probe device slide along two centrally symmetrical involutes to change the distance between the upper and lower probes. The present invention has high measurement accuracy and good 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 and outer diameters 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 components is a crucial component of part dimensions. For example, the diameter of the hole and shaft is extremely important for the axial positioning of the part, ensuring the correct position of the part during assembly, improving assembly precision and efficiency. It also has a significant impact on the installation and sealing effect of seals. The correct hole and shaft diameter ensures effective sealing. If the hole and shaft fit is too tight or too loose, it may cause increased wear and shorten the service life of the part. Therefore, controlling the diameter of the hole and shaft is crucial to reducing wear and extending the service life of the part. In summary, the diameter of the hole and shaft is of great significance to the assembly, function, performance, and service life of the part, and is a parameter that requires special attention and precise control in mechanical design and manufacturing. The diameter of the hole and shaft is mainly measured with calipers or using specialized measuring instruments such as horizontal and vertical measuring instruments.

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

[0004] The existing hole shaft diameter measurement technology has the following technical problems: low measurement accuracy, poor stability, and inconvenient portability. Summary of the Invention

[0005] In response to the above-mentioned 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 includes a double involute frustum, a long hole cover, and a cover plate; the probe device includes 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 a connecting rod, and the connecting rod is connected to the connecting table through a flat key shaft hole; the connecting rod is fixed to the long hole cover by a tightening component;

[0008] The oblong hole cover is connected to the cover plate, and 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 enable the connecting rods of the two probe devices to move relative to each other, thereby changing the distance between the probes of the two probe devices;

[0009] The flexible hinge includes 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 via a flexible hinge gasket;

[0010] The probe assembly also includes a flexible hinge clamping device comprising a double-ended screw and a clamping knob. The double-ended screw has two screw ends and a circular ring structure extending from the middle to contact the flexible hinge. One end of the double-ended screw is connected to the threaded hole of the connecting platform, and the other end is secured by the clamping knob. Preferably, the connecting rod is secured to the slotted cover via an annular gasket and a tightening device.

[0011] Preferably, the edge of the double involute cone is engraved with a scale indicating 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 driving device further comprises a wrench, one end of which is connected to the boss structure at the bottom of the double involute frustum, so as to be used for rotating the double involute frustum.

[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-like 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 frustum is rotated to drive the probe device to move up and down until the inner side of the probe is clamped with a gauge block, and then the connecting rod is fixed using 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-like part by the following formula: the diameter R of the hole-like part 孔 Calculation formula:

[0015] R 孔 =L-2δ+2ε

[0016] in L The distance between the two probes of the probe device measured by the calibration of the gauge block; 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 a shaft part 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 frustum is rotated to drive the probe device to move up and down until the inner side of the probe ball head is clamped with the gauge block, and then the connecting rod is fixed using 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 The distance between the two probes of the probe device measured by the calibration of the gauge block; δ The displacement of the displacement sensor when it moves to its maximum value.

[0020] In general, the above technical solutions conceived by the present invention, compared with the prior art, provide a diameter measuring device with the following advantages:

[0021] (1) The present invention uses an involute groove to drive the probe device, and uses the rotation angle of the double involute cone to calculate the distance between the two probe devices, which can roughly estimate the measuring range of the measuring device. It 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 during measurement, no mechanical friction, no gap, and high movement sensitivity, ensuring the probe's linear movement, making the measurement accuracy higher.

[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 cone, the distance between the two probe devices is changed to obtain different measuring ranges. Therefore, the diameter measuring device has strong applicability and is conducive to promotion 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 Schematic diagram of a diameter measuring device along 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 Schematic diagram of the structure 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 the flexible hinge of a diameter measuring device.

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

[0033] Figure 9 It is a partial cross-sectional view of the probe device.

[0034] In all the drawings, the same figure marks 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 platform, 8-flat key, 9-flexible hinge gasket, 10-flexible hinge, 10.0-rectangular bracket, 10.1-X-direction flexible hinge, 10.2-first Y-direction flexible hinge, 10.3-second Y-direction flexible hinge, 10.4-third Y-direction flexible hinge, 11-displacement sensor, 12-displacement sensor stop, 13-probe, 14-double-headed screw, 15-clamping knob. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining 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 may be combined with each other as long as they do not conflict with each other.

[0036] On a plane, the trajectory of any point on a moving straight line (generator line) as it rolls along a fixed circle (base circle) is called an involute of the base circle. The length of the involute's generator line remains constant before and after it is straightened; that is, the length of the generator line along the base circle equals the arc length of the base circle. This property allows the distance of a point on the involute from the center of the base circle to be calculated using the point's angular displacement and the base circle diameter.

[0037] The present invention provides a diameter measuring device, comprising a double involute displacement drive device and two probe devices, wherein the double involute displacement drive 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 drive device comprises a double involute cone, a long hole cover and a cover plate; a connecting rod is connected to the probe device and has a spiral line thereon for installing a tightening component; the long hole cover is matched with the cover plate, and 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 linear motion during movement and does not undergo angular displacement; the double involute cone is engraved with a centrally symmetrical involute, 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; and 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 via a 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 and is driven by the unidirectional movement of the probe X-axis to record 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 it 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. The double-headed screw is connected to the threaded hole of the connecting platform on one side and 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, thereby locking the flexible hinge.

[0039] After the flexible hinge clamping device locks the flexible hinge, a gauge block of appropriate size is used to determine the distance between the two probes. The probe assembly is driven by rotating the involute table so that the inner sides of the two probes contact the gauge block, and then the connecting rod clamping device is used to secure them. The distance between the probes can be determined to facilitate subsequent diameter measurement.

[0040] In some embodiments, the edge of the double involute table is engraved with a scale 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 measurement range.

[0042] In some embodiments, the hinge structure is basically 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; one end of the first Y-direction flexible hinge is connected to the rectangular bracket; the other end of the second Y-direction flexible hinge is connected to the rectangular bracket; the other end of the third Y-direction 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 probe is fixed to the first X-direction flexible hinge. Due to the action of the flexible hinge, the probe generates X-direction translation during measurement, which is transmitted to the displacement sensor through the hinge structure.

[0045] In some embodiments, the stylus assembly is symmetrically arranged, with the stylus mounted proximate to one side of the flexible hinge. Changing the orientation of the flexible hinge on the stylus assembly allows for varying the measurement range. When the stylus is simultaneously deflected toward the inside of the connection platform, the measurement range is smaller; when the stylus is simultaneously deflected toward the outside of the connection platform, the measurement range 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 drive 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. 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. 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. The connecting rod 4 cooperates with the rectangular groove on the back of the long hole cover 1 and cooperates with 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. During operation, the wrench rotates the double involute cone 3 to drive the two connecting rods 4 to generate displacement, driving the probe device to move and change the measuring range. The tightening device 6 is tightened to tightly fit the annular gasket 5 and the connecting rod 4, thereby securing the connecting rod 4 to the slotted hole cover 1. When the stylus 13 contacts the hole / shaft component, it generates an X-direction displacement, causing the flexible hinge 10 to also generate an X-direction displacement. The flexible hinge 10 converts this displacement into a proportional change in the local position of the displacement sensor block 12, allowing the displacement sensor 11 to obtain the position coordinates of the hole / shaft diameter in the stylus coordinate system and thereby calculate the measured hole / shaft diameter.

[0048] See also Figure 5 The probe device is arranged symmetrically, with the probe 13 installed near 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 smaller. When the two probes 13 are simultaneously biased toward the outer side of the connecting platform 7, the measuring range of the device is larger. According to the design of the probe device size, the distance between the probe 13 and the center 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 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 between the connecting rod 4 and 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. The distance between the two probes 13 is then:

[0052] Φ1=Φ±2ΔΦ

[0053] When both probes 13 are simultaneously deflected toward the outside of the connecting platform 7, a plus sign is indicated; when both probes 13 are simultaneously deflected toward the inside of the connecting platform 7, a minus sign is indicated. The distance between the probes 13 can be roughly determined using the above formula. The circular boss on the back of the double involute cone 3 extends through the circular hole in the center of the cover plate 2. A hexagonal bolt extends from the outside of the boss for connection to 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 substantially rectangular and includes an X-axis flexible hinge 10.1, a first Y-axis flexible hinge 10.2, a second Y-axis flexible hinge 10.3, and a third Y-axis flexible hinge 10.4. One end of the X-axis flexible hinge 10.1 is connected to the third Y-axis flexible hinge 10.4, and the other end of the X-axis flexible hinge 10.1 is connected to both the first Y-axis flexible hinge 10.2 and the second Y-axis flexible hinge 10.3. One end of the first Y-axis flexible hinge 10.2 is connected to the rectangular bracket 10.0; the other end of the second Y-axis flexible hinge 10.3 is connected to the rectangular bracket 10.0; and the other end of the third Y-axis 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. The displacement sensor stop 12 is connected to the first Y-axis flexible hinge 10.2 and is in contact with the displacement sensor 11. The stylus 13 is connected to the X-axis flexible hinge 10.1. The stylus 13 is driven by the Y-axis and X-axis hinge structures to move unidirectionally along the X-axis.

[0055] The flexible hinge gasket 9 is a frame-like structure used to connect the connecting platform 7 and the flexible hinge 10. The flexible hinge gasket 9 stabilizes the load distribution. The flexible hinge gasket 9, the connecting platform 7, and the flexible hinge 10 are connected together by long bolts. The flexible hinge gasket 9 provides sufficient height for the stud screw 14, allowing its annular structure to fit closely on the lower surface of the flexible hinge 10.

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

[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 to record the X-axis displacement data. A specific displacement sensor is selected, such as the DZR / 2 / S displacement sensor of Solartron Metrology, which has a measurement range of 2.25mm. 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, the measurement range of the displacement sensor 11 is 2.25mm. ±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 in shape, with an increased radius at the lower part 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 screwing it 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 is made of 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 double-ended screw 14 has two screw ends, with a circular ring extending from the middle to contact the flexible hinge 10. One end of the double-ended screw is connected to the threaded hole of the connecting platform, and the other end is connected to the clamping knob 15. The clamping knob 15 is generally cylindrical, with a radius increased at the bottom to increase the contact area with the flexible hinge 10. When the flexible hinge clamping device is in operation, the double-ended screw is first rotated to ensure that the upper surface of the circular ring structure is in close contact with the lower surface of the flexible hinge. The clamping knob is then rotated to contact the upper surface of the flexible hinge, thereby locking the flexible hinge.

[0061] See also Figure 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. The screws pass through the center hole of the connecting platform 7 and the threaded holes 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 the hexagonal bolt structure extending from the bottom of the double involute cone 3. When the distance between the two probes 13 needs to be changed, the wrench is used to rotate the double involute cone 3 to drive the probe device to move and change the measuring range.

[0063] After the flexible hinge clamping device locks the flexible hinge, a gauge block of appropriate size is used to determine the distance between the two probes 13. The probe assembly is driven by rotating the involute frustum 3 so that the inner sides of the two probes 13 contact the gauge block, and then secured using the connecting rod clamping device. The distance between the probes 13 is determined to facilitate subsequent diameter measurement.

[0064] The present invention first uses a gauge block to accurately determine the distance between the inner sides of the stylus's ruby ​​ball. The stylus's ruby ​​ball then contacts the hole / shaft being measured. This effectively obtains the positional coordinates of the hole / shaft diameter in the stylus's coordinate system from the installed displacement sensor 11, allowing the diameter of the measured hole / shaft to be calculated. When measuring the diameter of a shaft part using this device, the stylus 13 axially contacts the outer surface of the shaft, repeatedly measuring back and forth, and taking the data at the minimum displacement of the displacement sensor as the shaft diameter. When measuring the diameter of a hole part using this device, the stylus 13 axially contacts the inner surface of the hole, taking multiple measurements at multiple points, and taking the data at the maximum displacement of the displacement sensor as the hole diameter.

[0065] The specific measurement process of this embodiment is as follows: When measuring hole-type parts, secure the displacement sensor and probe with a flexible hinge clamp. Use a wrench to rotate the double involute frustum to move the probe assembly up and down until the inside of the probe's ruby ​​ball engages the gauge block. Then, use the tightening device to secure the connecting rod. Using this device, axially touch the upper and lower probes to the upper and lower outer surfaces of the hole. Take multiple measurements at multiple points, and use the result calculated when the displacement sensor moves at the minimum value. The formula for calculating the diameter of hole-type parts is:

[0066] R 孔 =L-2δ+2ε

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

[0068] When measuring shaft parts, secure the displacement sensor and probe with a flexible hinge clamp. Use a wrench to rotate the double involute cone to move the probe assembly up and down until the inside of the probe's ruby ​​ball engages the gauge block. Then, secure the connecting rod with a tightening device. Using this device, move the upper and lower probes axially against the upper and lower outer surfaces of the shaft. Take multiple measurements at multiple points, and calculate the result when the displacement sensor reaches its maximum value. Formula for calculating the diameter of 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 merely 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 scope of protection 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 block (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 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, wherein: The edge of the double involute cone (3) is engraved with a scale 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, wherein: 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 (3), thereby being used to rotate the double involute cone (3).

5. The diameter measuring device according to claim 1, wherein: The flexible hinge (10) 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.

6. A method for measuring the diameter of a hole-type 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 frustum to drive the probe device 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 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 using the following formula; the diameter of the hole part R 孔 Calculation formula: R 孔 =L-2δ+2ε in L The distance between the two probes of the probe device measured by the calibration of the gauge block; δ The displacement of the displacement sensor when it moves to the minimum value; ε is the diameter of the probe ball.

7. A method for measuring the diameter of a shaft 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 with a flexible hinge clamping device, rotate the double involute frustum to drive the probe device 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 with the two probes, take multiple measurements at multiple points, and use the data when the displacement sensor moves at the maximum value to calculate the diameter of the shaft part using the following formula; the diameter of the shaft part R 轴 Calculation formula: R 轴 =L+2δ in L The distance between the two probes of the probe device measured by the calibration of the gauge block; δ The displacement of the displacement sensor when it moves to its maximum value.

Images