Non-contact screw propulsion vertical precision measuring device for profile of inner hole of slender pipe

Abstract

The invention discloses a non-contact screw propulsion vertical precision measurement device for the contour of an inner hole of a slender tube, and belongs to the technical field of precision measurement. The device comprises a guide assembly, a measurement assembly, a control assembly, a fixing clamp assembly, a power assembly and a bottom plate, the guide assembly is composed of a linear bearing assembly, an optical shaft and a sliding rail. The measuring assembly is composed of a circumferential measuring assembly and a length measuring assembly. The power assembly is composed of an axial power assembly and a circumferential power assembly. The whole device is vertically arranged, so that the influence of gravity on the deflection of the pipe fitting is avoided, and the measurement accuracy is improved. The measuring core of the device is composed of a small laser displacement sensor based on the triangulation principle and a grating ruler, the laser displacement sensor is arranged in a split mode, and measurement of small-diameter and complex-section pipe fittings can be achieved. The magnetic bearing is adopted to bear the weight of the circumferential power assembly so as to eliminate the influence of mechanical friction on the measurement precision. According to the measuring device, high-precision and high-efficiency automatic measurement of the contour of the inner hole of the slender pipe fitting can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of precision measurement, and in particular to a non-contact spiral-propelled vertical precision measuring device for automatically measuring the inner hole profile of a slender tube. Background Art

[0002] In the fields of machinery manufacturing, automobile industry, aerospace, military industry, etc., the dimensional accuracy, shape error (such as roundness, cylindricity) and position accuracy (such as coaxiality, position) of the inner hole have a vital impact on the performance and service life of the workpiece. As the core structure of many key components (such as engine cylinder, bearing seat, hydraulic valve body, etc.), the processing quality of the inner hole directly determines the reliability and stability of the product. Therefore, high-precision measurement of the inner hole is an important part of ensuring product quality.

[0003] Traditional methods of measuring inner holes mainly rely on manual operation, using calipers, internal diameter micrometers, plug gauges and other tools for measurement. Although these methods are simple and easy to use, they have significant problems such as low measurement efficiency, unstable measurement accuracy, limited measurement range, and complex operation. With the rapid development of industrial automation technology, especially the continuous improvement of measurement accuracy and efficiency requirements in the field of precision manufacturing, traditional methods of measuring inner holes have gradually failed to meet the needs of modern industry. Various measuring devices have appeared on the market, but there are still a series of problems. Contact measurement is easy to scratch the inner wall and is difficult to adapt to small apertures; optical endoscopes are used for measurement, which is limited by the field of view and cannot achieve full-circle continuous measurement; linear propulsion measuring devices are used for measurement, which is easy to cause motion deviations due to gravity or friction, affecting the measurement accuracy. Therefore, there is an urgent need for a non-contact, full-circle coverage and stable motion inner hole measurement device for slender tubes.

[0004] The non-contact spiral-propelled vertical precision measuring device for the inner hole profile of a slender tube is an advanced device that integrates high-precision measurement, automated operation and non-contact measurement. It is mainly used for fast, accurate and continuous measurement of the inner hole profile of a workpiece. Summary of the invention

[0005] The purpose of the present invention is to provide a non-contact spiral-propelled vertical precision measuring device for the inner hole profile of a slender tube. The measuring device drives the sensor to spirally advance along the inner wall of the tube through a spiral motion mechanism, and combines a vertical layout to suppress gravity offset to meet the measurement needs of complex workpieces. A small laser displacement sensor based on the principle of high-precision triangulation is used to ensure the accuracy and repeatability of the measurement results.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A non-contact spiral-propelled vertical precision measuring device for the inner hole profile of a slender tube, which consists of a guide component, a measuring component, a control component, a fixing fixture component, a power component, and a base plate. The overall vertical layout is adopted to avoid the influence of gravity on the deflection of the tube and improve the measurement accuracy.

[0008] The guide assembly consists of a linear bearing assembly 1, an optical axis 2, a slider 68, and a guide rail 610. The linear bearing assembly 1 is fixed to the base plate 8 by a set screw group 13, and the guide rail 610 is fixed to the base plate 8 by a set screw group 69; the fixing fixture assembly 3 is fixed to the base plate 8 by a nut 33; the measuring assembly consists of a circumferential measuring assembly 4 and a length measuring assembly 7. The circumferential measuring assembly 4 is fixed to the optical axis 2 and the optical axis 61 by a set screw group 41, and the length measuring assembly 7 is fixed to the base plate 8 by a set screw group 73; the power assembly consists of an axial power assembly 5 and a circumferential power assembly 6. The axial power assembly 5 is fixed to the base plate 8 by a set screw group 55, and the circumferential power assembly 6 is fixed to the base plate 8 by a set screw group 69; the control assembly 9 is fixed to the base plate 8 by a set screw group 94.

[0009] The linear bearing assembly 1 is composed of a linear bearing seat 11, a fastening screw group 12, a fastening screw group 13, a bearing seat backing plate 14, and a linear bearing 15. The linear bearing seat 11 is fixed to the bearing seat backing plate 14 by the fastening screw group 12, and the linear bearing 15 is fixed to the linear bearing seat 11 by the fastening screw group 12, so as to realize the axial guidance of the inner hole measuring device, and adopt the form of two-end support to ensure the stability and accuracy of the measuring device.

[0010] The fixing fixture assembly 3 is composed of a clamp 31, a clamp 32, and a set of screws 33. The clamp 31 is connected to the clamp 32 by the set of screws 33 to clamp the pipe to be measured. The height of the pipe to be measured can be adjusted by rotating the thread to adjust the position of the clamp 32, thereby achieving the centering operation of the measurement.

[0011] The circumferential measurement component 4 is composed of a set screw group 41, a measurement component fixing frame 42, a laser displacement sensor circuit board 43, a set screw group 44, and a laser displacement sensor 45. The laser displacement sensor circuit board 43 and the laser displacement sensor 45 are arranged in a split type, which reduces the volume occupied by the sensor, thereby further reducing the size of the measured pipe diameter. The measurement component fixing frame 42 is fixed to the optical axis 2 and the optical axis 61 by the set screw group 41, the laser displacement sensor circuit board 43 is fixed to the measurement component fixing frame 42 by the set screw group 44, and the laser displacement sensor 45 is fixed to the measurement component fixing frame 42 by the set screw group 44, so as to realize non-contact measurement of the inner hole profile of the measured pipe.

[0012] The axial power assembly 5 is composed of a slider connecting plate 51, a stepper motor 52, a rubber connecting plate 53, a slider 54, a set screw group 55, a rubber damping plate 56, and a slide 57. The slider connecting plate 51 is fixed to the slider 54 and the rubber connecting plate 53 by the set screw group 55, the stepper motor 52 is fixed to the slide 57 by the set screw group 55, and the rubber connecting plate 53 is fixed to the slider connecting plate 51 and the stepper motor connecting plate 65 by the set screw group 55, so as to realize the axial movement of the measuring device and avoid the movement of the device from being stuck; the slider 54 is connected to the slide 57, and the rubber damping plate 56 is connected to the slide 57 and the base plate 8 by the set screw group 55, so as to realize the damping during the operation of the measuring device.

[0013] The circumferential power assembly 6 is composed of an optical axis 61, a slip ring 62, a bearing seat 63, a coupling 64, a stepper motor connecting plate 65, a stepper motor 66, a motor bracket 67, a slider 68, a fastening screw group 69, and a guide rail 610. The optical axis 61 is connected to the stepper motor 66 through the coupling 64, and the slip ring 62 is fixed to the stepper motor connecting plate 65 through the fastening screw group 69 to solve the wire winding problem of the measuring device and ensure that the device can work normally during the rotation process; the stepper motor 66 is fixed to the motor bracket 67 through the fastening screw group 69, and the motor bracket 67 is fixed to the stepper motor connecting plate 65 through the fastening screw group 69. The slider 68 is fixed to the stepper motor connecting plate 65 and the guide rail 610 through the fastening screw group 69, and the guide rail 610 is fixed to the base plate 8 through the fastening screw group 69 to reduce errors and vibrations during the movement of the equipment. The magnetic bearing 611 is adsorbed on the coupling 64, and the magnetic bearing 612 is adsorbed on the motor bracket 67. The magnetic bearing 611 and the magnetic bearing 612 interact to generate a repulsive force to carry the weight of the circumferential power component. The magnetic bearing achieves contactless support through the repulsive force to eliminate the influence of mechanical friction on the measurement accuracy. The axial power component 5 and the circumferential power component 6 cooperate with each other to realize the spiral propulsion measurement of the device.

[0014] The length measuring assembly 7 is composed of a grating ruler rail 71, a rubber connecting plate 72, a set screw group 73, and a grating ruler slider 74. The grating ruler rail 71 is fixed to the bottom plate 8 by the set screw group 73, and the grating ruler slider 74 is fixed to the grating ruler rail 71 to realize the length measuring function of the device; the rubber connecting plate 72 is fixed to the grating ruler slider 74 and the stepping motor connecting plate 65 by the set screw group 73 to avoid the movement of the device from being stuck. The circumferential measuring assembly 4 cooperates with the length measuring assembly 7 to realize the contour measurement of the inner hole of the pipe fitting.

[0015] The control assembly 9 is composed of a stepper motor signal converter 91, a stepper motor relay 92, a stepper motor relay 93, a fastening screw group 94, a grating ruler electronic component 95, a stepper motor driver 96, a stepper motor driver 97, and a fastening screw group 98. The stepper motor signal converter 91, the stepper motor relay 92, the stepper motor relay 93, and the grating ruler electronic component 95 are fixed to the bottom plate by the fastening screw group 94, and the stepper motor driver 96 and the stepper motor driver 97 are fixed to the bottom plate by the fastening screw group 98. The control assemblies work together and cooperate with each other to realize the work of the measuring device.

[0016] The working process of the present invention is as follows:

[0017] Before the experiment, clamp the pipe to be measured on the internal bore measuring machine and perform the centering operation. Adjust the pipe to be measured to the appropriate position by adjusting the height of the clamp. The power is turned off. Reset the internal bore measuring machine to zero position.

[0018] Experimental process: 1) Set the speed of stepper motor 52 and stepper motor 66; 2) First start stepper motor 66, then start stepper motor 52, so that laser displacement sensor 44 is located outside the measured pipe, and this point is set as the initial position; 3) Turn on the power supply, when the inner hole measuring machine starts working, stepper motor 52 drives slider 54 to move, and then drives laser displacement sensor 44 to move axially, and drives grating ruler slider 74 to move, at this time, grating ruler records the displacement of laser displacement sensor in the axial length direction. Stepper motor 66 drives laser displacement sensor 44 to move circumferentially; 4) After signal acquisition, stepper motor 52 and stepper motor 66 stop running, and the experimental data is stored as a callable file.

[0019] The advantages of the present invention are:

[0020] 1. It uses a small laser displacement sensor based on the principle of high-precision triangulation for measurement, and adopts a split layout. Compared with the traditional layout, it can measure pipes with small diameters and complex cross-sections. It has the advantages of wide measurement range, low requirements on surface characteristics, low cost, fast response speed, high measurement accuracy, strong environmental adaptability, and high technical maturity.

[0021] 2. Linear bearings and angular contact ball bearings are used for support at the same time. The two ends of the workpiece are fixed and guide components such as guide rails and slide rails are used to ensure the coaxiality of the measurement, which can realize the inner contour measurement of slender tubes.

[0022] 3. The grating ruler, encoder and driver work together to acquire and process data, realizing the spiral advancement continuous measurement of the inner contour of the slender tube.

[0023] 4. The vertical layout is adopted to avoid the influence of gravity on the deflection of the measured pipe. The magnetic bearing is used to bear the weight of the circumferential power component to eliminate the influence of mechanical friction on the measurement accuracy, further improving the accuracy of the measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an axonometric view of the overall structure of the present invention (front view);

[0025] Figure 2 is an axonometric view of a linear bearing assembly of the present invention;

[0026] Figure 3 is an axonometric view of a fixing fixture assembly of the present invention;

[0027] Figure 4 It is an axonometric view of the circumferential measurement assembly of the present invention;

[0028] Figure 5 It is an axonometric view of the axial power assembly of the present invention;

[0029] Figure 6 It is an axonometric view of the circumferential power assembly of the present invention;

[0030] Figure 7 is an axonometric view of a magnetic bearing assembly of the present invention;

[0031] Figure 8 is an axonometric view of the length measurement assembly of the present invention;

[0032] Fig. 9 It is the overall structural axonometric view of the present invention (reverse side).

[0033] 1. Linear bearing assembly 11. Linear bearing seat 12. Fastening screw group 13. Fastening screw group 14. Bearing seat pad 15. Linear bearing 2. Optical axis 3. Fixing fixture assembly 31. Clamp 32. Clamp 33. Fastening screw group 4. Circumferential measurement assembly 41. Fastening screw group 42. Measurement assembly fixing frame 43. Laser displacement sensor circuit board 44. Fastening screw group 45. Laser displacement sensor 5. Axial power assembly 51. Slider connecting plate 52. Stepper motor 53. Rubber connecting plate 54. Slider 55. Fastening screw group 56. Rubber shock absorbing plate 57. Slide table 6. Circumferential power assembly 61. Optical Shaft 62. Slip ring 63. Bearing seat 64. Coupling 65. Stepper motor connecting plate 66. Stepper motor 67. Motor bracket 68. Slider 69. Fastening screw group 610. Guide rail 611. Magnetic bearing 612. Magnetic bearing 7. Length measurement component 71. Grating scale guide rail 72. Rubber connecting plate 73. Fastening screw group 74. Grating scale slider 8. Base plate 9. Control component 91. Stepper motor signal converter 92. Stepper motor relay 93. Stepper motor relay 94. Fastening screw group 95. Grating scale electronic components 96. Stepper motor driver 97. Stepper motor driver 98. Fastening screw group DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings:

[0035] A non-contact spiral-propelled vertical precision measuring device for the inner hole profile of a slender tube, which consists of a guide component, a measuring component, a control component, a fixed fixture component, a power component, and a base plate. The overall vertical layout avoids the influence of gravity on the deflection of the tube and improves the measurement accuracy.

[0036] like Figure 1 As shown, the guide assembly consists of a linear bearing assembly 1, an optical axis 2, a slider 68, and a guide rail 610. The linear bearing assembly 1 is fixed to the base plate 8 by a set screw group 13, and the guide rail 610 is fixed to the base plate 8 by a set screw group 69; the fixing fixture assembly 3 is fixed to the base plate 8 by a nut 33; the measuring assembly consists of a circumferential measuring assembly 4 and a length measuring assembly 7, the circumferential measuring assembly 4 is fixed to the optical axis 2 and the optical axis 61 by a set screw group 41, and the length measuring assembly 7 is fixed to the base plate 8 by a set screw group 73; the power assembly consists of an axial power assembly 5 and a circumferential power assembly 6, the axial power assembly 5 is fixed to the base plate 8 by a set screw group 55, and the circumferential power assembly 6 is fixed to the base plate 8 by a set screw group 69; the control assembly 9 is fixed to the base plate 8 by a set screw group 94.

[0037] like Figure 2As shown, the linear bearing assembly 1 is composed of a linear bearing seat 11, a fastening screw group 12, a fastening screw group 13, a bearing seat pad 14, and a linear bearing 15. The linear bearing seat 11 is fixed to the bearing seat pad 14 by the fastening screw group 12, and the linear bearing 15 is fixed to the linear bearing seat 11 by the fastening screw group 12, so as to realize the axial guidance of the inner hole measuring device, and adopt the form of two-end support to ensure the stability and accuracy of the measuring device.

[0038] like Figure 3 As shown, the fixing fixture assembly 3 is composed of a clamp 31, a clamp 32, and a set of screws 33. The clamp 31 is connected to the clamp 32 by the set of screws 33 to clamp the pipe to be measured. The height of the pipe to be measured can be adjusted by rotating the thread to adjust the position of the clamp 32, thereby achieving the centering operation of the measurement.

[0039] like Figure 4 As shown, the circumferential measurement component 4 is composed of a fastening screw group 41, a measurement component fixing frame 42, a laser displacement sensor circuit board 43, a fastening screw group 44, and a laser displacement sensor 45. The laser displacement sensor circuit board 43 and the laser displacement sensor 45 are arranged in a split type, which reduces the volume occupied by the sensor, thereby further reducing the size of the measured pipe diameter. The measurement component fixing frame 42 is fixed to the optical axis 2 and the optical axis 61 by the fastening screw group 41, the laser displacement sensor circuit board 43 is fixed to the measurement component fixing frame 42 by the fastening screw group 44, and the laser displacement sensor 45 is fixed to the measurement component fixing frame 42 by the fastening screw group 44, so as to realize non-contact measurement of the circumferential parameters of the measured pipe.

[0040] like Figure 5 As shown, the axial power assembly 5 is composed of a slider connecting plate 51, a stepper motor 52, a rubber connecting plate 53, a slider 54, a set screw group 55, a rubber damping plate 56, and a slide 57. The slider connecting plate 51 is fixed to the slider 54 and the rubber connecting plate 53 through the set screw group 55, the stepper motor 52 is fixed to the slide 57 through the set screw group 55, and the rubber connecting plate 53 is fixed to the slider connecting plate 51 and the stepper motor connecting plate 65 through the set screw group 55, so as to realize the axial movement of the measuring device and avoid the movement of the device from being stuck; the slider 54 is connected to the slide 57, and the rubber damping plate 56 is connected to the slide 57 and the base plate 8 through the set screw group 55, so as to realize the damping during the working process of the measuring device.

[0041] like Figure 6As shown, the circumferential power assembly 6 consists of an optical axis 61, a slip ring 62, a bearing seat 63, a coupling 64, a stepper motor connecting plate 65, a stepper motor 66, a motor bracket 67, a slider 68, a fastening screw group 69, and a guide rail 610. The optical axis 61 is connected to the stepper motor 66 through the coupling 64, and the slip ring 62 is fixed to the stepper motor connecting plate 65 through the fastening screw group 69 to solve the wire winding problem of the measuring device and ensure that the device can work normally during the rotation process; the stepper motor 66 is fixed to the motor bracket 67 through the fastening screw group 69, and the motor bracket 67 is fixed to the stepper motor connecting plate 65 through the fastening screw group 69. The slider 68 is fixed to the stepper motor connecting plate 65 and the guide rail 610 through the fastening screw group 69, and the guide rail 610 is fixed to the base plate 8 through the fastening screw group 69 to reduce errors and vibrations during the movement of the equipment. The magnetic bearing 611 is adsorbed on the coupling 64, and the magnetic bearing 612 is adsorbed on the motor bracket 67. The magnetic bearing 611 and the magnetic bearing 612 interact to generate a repulsive force to carry the weight of the circumferential power component. The magnetic bearing achieves contactless support through the repulsive force to eliminate the influence of mechanical friction on the measurement accuracy. The axial power component 5 and the circumferential power component 6 cooperate with each other to realize the spiral propulsion measurement of the device.

[0042] like Figure 8 As shown, the length measuring assembly 7 is composed of a grating ruler rail 71, a rubber connecting plate 72, a set screw group 73, and a grating ruler slider 74. The grating ruler rail 71 is fixed to the bottom plate 8 by the set screw group 73, and the grating ruler slider 74 is fixed to the grating ruler rail 71 to realize the length measuring function of the device; the rubber connecting plate 72 is fixed to the grating ruler slider 74 and the stepping motor connecting plate 65 by the set screw group 73 to avoid the movement of the device from being stuck. The circumferential measuring assembly 4 cooperates with the length measuring assembly 7 to realize the profile measurement of the inner hole of the pipe fitting.

[0043] like Fig. 9 As shown, the control component 9 is composed of a stepper motor signal converter 91, a stepper motor relay 92, a stepper motor relay 93, a fastening screw group 94, a grating scale electronic component 95, a stepper motor driver 96, a stepper motor driver 97, and a fastening screw group 98. The stepper motor signal converter 91, the stepper motor relay 92, the stepper motor relay 93, and the grating scale electronic component 95 are fixed to the bottom plate through the fastening screw group 94, and the stepper motor driver 96 and the stepper motor driver 97 are fixed to the bottom plate through the fastening screw group 98. The control components work together and cooperate with each other to realize the work of the measuring device.

Claims

1. A non-contact spiral-propelled vertical precision measuring device for the inner hole profile of a slender tube, characterized in that: It consists of a guide component, a measuring component, a control component, a fixed fixture component, a power component, and a base plate, wherein the measuring component realizes the measurement of the inner hole contour of the pipe fitting through the cooperation of a laser displacement sensor and a grating ruler; the overall vertical layout avoids the influence of gravity on the deflection of the pipe fitting and improves the measurement accuracy; linear bearings and angular contact ball bearings are used for support at both ends to ensure the coaxiality of the device measurement and facilitate the measurement of long pipes.

2. The non-contact spiral-propelled vertical precision measuring device for the inner hole profile of a slender tube according to claim 1, characterized in that: The measuring assembly is composed of a circumferential measuring assembly (4) and a length measuring assembly (7), wherein the circumferential measuring assembly (4) is composed of a fastening screw group (41), a measuring assembly fixing frame (42), a laser displacement sensor circuit board (43), a fastening screw group (44), and a laser displacement sensor (45); wherein the laser displacement sensor circuit board (43) and the laser displacement sensor (45) are arranged in a split type, thereby reducing the volume occupied by the sensors, thereby further reducing the size of the measured pipe diameter; the measuring assembly fixing frame (42) is fixed to the optical axis (2) and the optical axis (61) by the fastening screw group (41), the laser displacement sensor circuit board (43) is fixed to the measuring assembly fixing frame (42) by the fastening screw group (44), and the laser displacement sensor (45) is fixed to the measuring assembly fixing frame (42) by the fastening screw group (44); the circumferential measuring assembly cooperates with the grating ruler and the encoder to realize the spiral propulsion measurement of the inner hole profile of the measured pipe.

3. The non-contact spiral-propelled vertical precision measuring device for the inner hole profile of a slender tube according to claim 1, characterized in that: The power assembly is composed of an axial power assembly (5) and a circumferential power assembly (6), wherein the power assembly (6) is composed of an optical axis (61), a slip ring (62), a bearing seat (63), a coupling (64), a stepper motor connecting plate (65), a stepper motor (66), a motor bracket (67), a slider (68), a fastening screw group (69), and a guide rail (610). The optical axis (61) is connected to the stepper motor (66) through the coupling (64), and the slip ring (62) is fixed to the stepper motor connecting plate (65) through the fastening screw group (69) to solve the wire winding problem of the measuring device and ensure that the device can work normally during the rotation process; the stepper motor (66) is fixed to the motor bracket through the fastening screw group (69). (67), the motor bracket (67) is fixed to the stepper motor connecting plate (65) by a fastening screw group (69), the slider (68) is fixed to the stepper motor connecting plate (65) and the guide rail (610) by a fastening screw group (69), and the guide rail (610) is fixed to the base plate (8) by a fastening screw group (69), so as to reduce errors and vibrations during the movement of the equipment; the magnetic bearing (611) is adsorbed on the coupling (64), and the magnetic bearing (612) is adsorbed on the motor bracket (67), and the magnetic bearing (611) and the magnetic bearing (612) interact to generate a repulsive force to bear the weight of the circumferential power component, and the magnetic bearing realizes contactless support through the repulsive force to eliminate the influence of mechanical friction on the measurement accuracy.

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